From d7d9b906f57e841b1507509b9e3b3a8a985c6e5a Mon Sep 17 00:00:00 2001
From: Thomas Lin Pedersen
Date: Fri, 4 Sep 2026 13:43:56 +0200
Subject: [PATCH 01/21] Upgrade to hephaestus 0.4.0
---
CHANGELOG.md | 3 +
Cargo.lock | 15 +-
ggsql-cli/Cargo.toml | 6 +
ggsql-cli/examples/visual_test.rs | 283 +++++++++++-
src/Cargo.toml | 16 +-
src/writer/hephaestus/canvas.rs | 169 +++++++
src/writer/hephaestus/compose.rs | 351 ++++++++++++++
src/writer/hephaestus/facet.rs | 2 +-
src/writer/hephaestus/geom/densified.rs | 2 +-
src/writer/hephaestus/geom/mod.rs | 2 +-
src/writer/hephaestus/mod.rs | 586 +++++-------------------
src/writer/hephaestus/raster.rs | 59 +++
src/writer/hephaestus/wiring.rs | 22 +-
src/writer/mod.rs | 16 +-
src/writer/options.rs | 50 ++
15 files changed, 1070 insertions(+), 512 deletions(-)
create mode 100644 src/writer/hephaestus/canvas.rs
create mode 100644 src/writer/hephaestus/compose.rs
create mode 100644 src/writer/hephaestus/raster.rs
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5ec8c0c1..40508bd4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -38,6 +38,9 @@
the png writer draws them.
### Changed
+- The png writer now records its render resolution in the PNG itself, so a
+ figure rendered above 96 dpi reports its true physical size instead of being
+ read as 72 dpi by whatever opens it.
- Dodging now only takes effect where groups actually meet on a position. A
layer whose grouping gives every group a position of its own — `colour` mapped
to the same column as the discrete axis, say — is drawn at its full width
diff --git a/Cargo.lock b/Cargo.lock
index 788e814d..5025f0ef 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2282,6 +2282,7 @@ dependencies = [
"anyhow",
"clap",
"ggsql",
+ "png",
"regex",
"serde_json",
"termimad",
@@ -2505,9 +2506,9 @@ checksum = "2304e00983f87ffb38b55b444b5e3b60a884b5d30c0fca7d82fe33449bbe55ea"
[[package]]
name = "hephaestus"
-version = "0.1.0"
+version = "0.4.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ca883b65468b673aab28f1c7a86690ad5a00c31a4547c93577ecfd569c47e9b4"
+checksum = "91f060494e66d6e8a9d6cbf513f0f39e212d37a89293b91fc40f61aeb461f9e5"
dependencies = [
"bytemuck",
"clipper2-rust",
@@ -5881,7 +5882,6 @@ dependencies = [
"thiserror 2.0.18",
"wgpu-core-deps-apple",
"wgpu-core-deps-emscripten",
- "wgpu-core-deps-wasm",
"wgpu-core-deps-windows-linux-android",
"wgpu-hal",
"wgpu-naga-bridge",
@@ -5906,15 +5906,6 @@ dependencies = [
"wgpu-hal",
]
-[[package]]
-name = "wgpu-core-deps-wasm"
-version = "29.0.3"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0c2f2fb042f36920771deb0b966543c5751b18f3d327760ffc90f74e20b2dcd4"
-dependencies = [
- "wgpu-hal",
-]
-
[[package]]
name = "wgpu-core-deps-windows-linux-android"
version = "29.0.3"
diff --git a/ggsql-cli/Cargo.toml b/ggsql-cli/Cargo.toml
index 20c96f7c..5d1ac49d 100644
--- a/ggsql-cli/Cargo.toml
+++ b/ggsql-cli/Cargo.toml
@@ -21,6 +21,12 @@ name = "visual_test"
path = "examples/visual_test.rs"
required-features = ["png", "duckdb", "vegalite", "builtin-data"]
+[dev-dependencies]
+# Decoding renders back to pixels, so `visual_test --baseline` can compare
+# pictures rather than files. Dev-only: nothing in the shipped binary reads a
+# PNG. Same major as the encoder hephaestus uses, so no second copy is built.
+png = "0.18"
+
[dependencies]
ggsql = { workspace = true }
diff --git a/ggsql-cli/examples/visual_test.rs b/ggsql-cli/examples/visual_test.rs
index 7dbd7fe5..69bee936 100644
--- a/ggsql-cli/examples/visual_test.rs
+++ b/ggsql-cli/examples/visual_test.rs
@@ -66,6 +66,15 @@ struct Args {
/// Render resolution, which also scales the plot chrome
#[arg(long, default_value_t = 300.0)]
dpi: f64,
+
+ /// A previous `--out` directory to diff this run's renders against.
+ ///
+ /// Every cell is labelled unchanged / changed / new in the report, and the
+ /// header carries the counts. A hephaestus bump changes behaviour on
+ /// purpose, so the point is not a zero diff — it is turning "eyeball 190
+ /// cells" into "eyeball the ones that moved".
+ #[arg(long, value_name = "DIR")]
+ baseline: Option,
}
// ============================================================================
@@ -199,12 +208,195 @@ fn front_matter_title(text: &str) -> Option {
// Running the corpus
// ============================================================================
+/// How a render compares with the same cell in a `--baseline` run.
+#[derive(Clone, Copy)]
+enum Delta {
+ /// Same pixels, exactly.
+ Identical,
+ /// Different pixels, but the whole picture matches under a small
+ /// translation — the signature of a chrome-width change nudging the panel.
+ /// Carries the residual left at the best alignment.
+ Shifted(f64),
+ /// Differs by more than a shift explains. These are the cells to look at.
+ Changed(f64),
+ /// The baseline has no render for this cell.
+ New,
+}
+
+/// Mean absolute grey difference, 0–255, below which an aligned pair counts as
+/// the same picture. Antialiasing alone puts a genuine match a little above
+/// zero, so this cannot be `0.0`; it is set from the observed spread across the
+/// doc corpus rather than derived.
+const SHIFT_TOLERANCE: f64 = 2.0;
+
+/// How far to search for an alignment, in pixels of the full-size render.
+const MAX_SHIFT: i32 = 24;
+
+/// Factor the comparison downsamples by before searching. The search cost is
+/// quadratic in both the shift range and the resolution, and a panel shift is a
+/// whole-image effect that survives a box filter.
+const COMPARE_SCALE: u32 = 8;
+
+impl Delta {
+ /// Compare freshly rendered bytes with the baseline's copy of `name`.
+ ///
+ /// Exact equality is close to useless across a dependency bump: a few
+ /// pixels of chrome-width change shifts every panel, so almost every cell
+ /// "differs" while looking identical. So the comparison aligns first —
+ /// searching a small translation and keeping the best residual — which
+ /// collapses a uniform shift to nearly nothing and leaves anything
+ /// structural large.
+ fn against(baseline: &Path, name: &str, bytes: &[u8]) -> Self {
+ let Ok(old) = fs::read(baseline.join("assets").join(name)) else {
+ return Delta::New;
+ };
+ if old == bytes {
+ return Delta::Identical;
+ }
+ match (Grey::decode(&old), Grey::decode(bytes)) {
+ (Some(a), Some(b)) => match a.aligned_residual(&b) {
+ // Different dimensions: not a shift, and not comparable.
+ None => Delta::Changed(f64::INFINITY),
+ Some(r) if r <= SHIFT_TOLERANCE => Delta::Shifted(r),
+ Some(r) => Delta::Changed(r),
+ },
+ // Undecodable, so fall back to saying it moved rather than
+ // claiming a match we cannot support.
+ _ => Delta::Changed(f64::INFINITY),
+ }
+ }
+
+ fn label(self) -> String {
+ match self {
+ Delta::Identical => "identical".to_string(),
+ Delta::Shifted(r) => format!("shifted · {r:.2}"),
+ Delta::Changed(r) if r.is_finite() => format!("changed · {r:.2}"),
+ Delta::Changed(_) => "changed".to_string(),
+ Delta::New => "new".to_string(),
+ }
+ }
+
+ /// CSS class, and the bucket the header counts by.
+ fn class(self) -> &'static str {
+ match self {
+ Delta::Identical => "identical",
+ Delta::Shifted(_) => "shifted",
+ Delta::Changed(_) => "changed",
+ Delta::New => "new",
+ }
+ }
+
+ /// Whether a human still needs to look at this cell.
+ fn needs_review(self) -> bool {
+ matches!(self, Delta::Changed(_))
+ }
+}
+
+/// A render reduced to one grey byte per pixel, downsampled for comparison.
+struct Grey {
+ width: usize,
+ height: usize,
+ px: Vec,
+}
+
+impl Grey {
+ /// Decode a PNG and reduce it to a downsampled grey plane.
+ fn decode(bytes: &[u8]) -> Option {
+ let decoder = png::Decoder::new(std::io::Cursor::new(bytes));
+ let mut reader = decoder.read_info().ok()?;
+ let mut buf = vec![0; reader.output_buffer_size()?];
+ let info = reader.next_frame(&mut buf).ok()?;
+ let channels = match info.color_type {
+ png::ColorType::Rgba => 4,
+ png::ColorType::Rgb => 3,
+ png::ColorType::Grayscale => 1,
+ png::ColorType::GrayscaleAlpha => 2,
+ png::ColorType::Indexed => return None,
+ };
+ // Composite onto white as a viewer would, so a transparent background
+ // does not read as black and swamp the residual.
+ let grey_at = |i: usize| -> f64 {
+ let p = &buf[i * channels..];
+ let (r, g, b, a) = match channels {
+ 1 => (p[0], p[0], p[0], 255),
+ 2 => (p[0], p[0], p[0], p[1]),
+ 3 => (p[0], p[1], p[2], 255),
+ _ => (p[0], p[1], p[2], p[3]),
+ };
+ let lum = 0.299 * r as f64 + 0.587 * g as f64 + 0.114 * b as f64;
+ let a = a as f64 / 255.0;
+ lum * a + 255.0 * (1.0 - a)
+ };
+
+ let scale = COMPARE_SCALE as usize;
+ let width = (info.width as usize).div_ceil(scale);
+ let height = (info.height as usize).div_ceil(scale);
+ let mut px = vec![0u8; width * height];
+ for by in 0..height {
+ for bx in 0..width {
+ let mut sum = 0.0;
+ let mut n = 0.0;
+ for y in by * scale..((by + 1) * scale).min(info.height as usize) {
+ for x in bx * scale..((bx + 1) * scale).min(info.width as usize) {
+ sum += grey_at(y * info.width as usize + x);
+ n += 1.0;
+ }
+ }
+ px[by * width + bx] = (sum / n).round() as u8;
+ }
+ }
+ Some(Grey { width, height, px })
+ }
+
+ /// The smallest mean absolute difference over a search of translations.
+ ///
+ /// `None` when the two have different dimensions, which no translation
+ /// reconciles.
+ fn aligned_residual(&self, other: &Grey) -> Option {
+ if self.width != other.width || self.height != other.height {
+ return None;
+ }
+ let reach = MAX_SHIFT / COMPARE_SCALE as i32;
+ let mut best = f64::INFINITY;
+ for dy in -reach..=reach {
+ for dx in -reach..=reach {
+ // Only the overlap is compared, so a shift is not penalised for
+ // the sliver it moves off the canvas.
+ let mut sum = 0.0f64;
+ let mut n = 0usize;
+ for y in 0..self.height as i32 {
+ let oy = y + dy;
+ if oy < 0 || oy >= self.height as i32 {
+ continue;
+ }
+ for x in 0..self.width as i32 {
+ let ox = x + dx;
+ if ox < 0 || ox >= self.width as i32 {
+ continue;
+ }
+ let a = self.px[y as usize * self.width + x as usize] as f64;
+ let b = other.px[oy as usize * self.width + ox as usize] as f64;
+ sum += (a - b).abs();
+ n += 1;
+ }
+ }
+ if n > 0 {
+ best = best.min(sum / n as f64);
+ }
+ }
+ }
+ Some(best)
+ }
+}
+
/// What a cell turned out to be, and what came of running it.
enum Outcome {
/// A query with a `VISUALISE` clause: the renders it produced.
Plot {
png: Option,
png_error: Option,
+ /// How the render compares with `--baseline`, when one was given.
+ delta: Option,
/// Vega-Lite JSON, inlined into the report when `--compare` is on
vegalite: Option,
vegalite_error: Option,
@@ -312,9 +504,14 @@ fn run_cells(source: Source, args: &Args, assets: &Path) -> SourceResult {
Ok(spec) => {
warnings.extend(spec.warnings().iter().map(|w| w.message.clone()));
+ let mut delta = None;
let (png, png_error) = match capture(|| png_writer.render(&spec)) {
Ok(bytes) => {
let name = format!("{}-{:02}.png", slug(&label), cell.index);
+ delta = args
+ .baseline
+ .as_deref()
+ .map(|b| Delta::against(b, &name, &bytes));
match fs::write(assets.join(&name), &bytes) {
Ok(()) => (Some(name), None),
Err(e) => (None, Some(format!("could not write PNG: {e}"))),
@@ -335,6 +532,7 @@ fn run_cells(source: Source, args: &Args, assets: &Path) -> SourceResult {
Outcome::Plot {
png,
png_error,
+ delta,
vegalite: vl,
vegalite_error: vl_error,
}
@@ -451,11 +649,27 @@ fn write_report(results: &[SourceResult], args: &Args, out: &Path) -> std::io::R
.flat_map(|r| &r.cells)
.filter(|c| c.is_problem())
.count();
+ let bucket = |class: &str| {
+ results
+ .iter()
+ .flat_map(|r| &r.cells)
+ .filter(
+ |c| matches!(&c.outcome, Outcome::Plot { delta: Some(d), .. } if d.class() == class),
+ )
+ .count()
+ };
+ let drift = args.baseline.as_deref().map(|_| {
+ (
+ bucket("identical") + bucket("shifted"),
+ bucket("changed"),
+ bucket("new"),
+ )
+ });
let aspect = format!("{} / {}", args.width, args.height);
let mut html = String::new();
- html.push_str(&report_head(total, plots, problems, args));
+ html.push_str(&report_head(total, plots, problems, drift, args));
html.push_str("\n");
for result in results {
@@ -514,9 +728,15 @@ fn render_cell(cell: &CellResult, label: &str, aspect: &str) -> String {
};
let problem = if cell.is_problem() { " problem" } else { "" };
+ // A shift-explained difference is not worth a human's time; a residual that
+ // a shift does not explain is exactly what the toggle exists to isolate.
+ let review = match &cell.outcome {
+ Outcome::Plot { delta: Some(d), .. } if d.needs_review() => " review",
+ _ => "",
+ };
let _ = write!(
html,
- "\n\
+ "\n\
{badge} \
{}:{} · cell {} \
{} \
@@ -549,10 +769,19 @@ fn render_cell(cell: &CellResult, label: &str, aspect: &str) -> String {
Outcome::Plot {
png,
png_error,
+ delta,
vegalite,
vegalite_error,
} => {
- html.push_str("png ");
+ let caption = match delta {
+ Some(d) => format!(
+ "png {} ",
+ d.class(),
+ d.label()
+ ),
+ None => "png".to_string(),
+ };
+ let _ = write!(html, "{caption} ");
match (png, png_error) {
(Some(name), _) => {
let _ = write!(
@@ -606,12 +835,29 @@ fn render_cell(cell: &CellResult, label: &str, aspect: &str) -> String {
html
}
-fn report_head(total: usize, plots: usize, problems: usize, args: &Args) -> String {
+fn report_head(
+ total: usize,
+ plots: usize,
+ problems: usize,
+ drift: Option<(usize, usize, usize)>,
+ args: &Args,
+) -> String {
let compare = if args.compare {
" · compared against vega-lite"
} else {
""
};
+ // The count that matters after a dependency bump is `changed`: it is the
+ // set a human still has to look at.
+ // `changed` is the count that matters after a dependency bump: it is the
+ // set a shift does not explain, and therefore the set to look at.
+ let drift = match drift {
+ Some((aligned, changed, new)) => format!(
+ " · {changed} to review \
+ · {aligned} same or shifted · {new} new"
+ ),
+ None => String::new(),
+ };
format!(
r#"
@@ -624,14 +870,16 @@ fn report_head(total: usize, plots: usize, problems: usize, args: &Args) -> Stri
only problems
+ only changes to review
"#,
style = STYLE,
+ drift = drift,
problem_class = if problems > 0 { "bad" } else { "good" },
width = args.width,
height = args.height,
@@ -672,6 +920,11 @@ pre.query { margin:0; padding:10px; background:#f7f7f7; border-radius:4px; font:
.renders { display:flex; gap:16px; flex-wrap:wrap; min-width:0; }
figure { margin:0; flex:1 1 420px; min-width:0; }
figcaption { font-size:11px; text-transform:uppercase; letter-spacing:.05em; color:var(--muted); margin-bottom:4px; }
+.delta { display:inline-block; padding:0 5px; border-radius:3px; font-weight:600; letter-spacing:0; text-transform:none; }
+.delta.identical { color:var(--muted); background:#f2f2f2; }
+.delta.shifted { color:var(--muted); background:#f2f2f2; }
+.delta.changed { color:#fff; background:var(--warn); }
+.delta.new { color:#fff; background:var(--good); }
figure img { width:100%; height:auto; border:1px solid var(--line); border-radius:4px; background:#fff; }
.vl { width:100%; border:1px solid var(--line); border-radius:4px; overflow:hidden; }
.vl > script { display:none; }
@@ -686,16 +939,19 @@ const REPORT_SCRIPT: &str = r#"
"#;
@@ -739,6 +995,21 @@ fn main() {
// path that does not move with them.
let assets = fs::canonicalize(&assets).unwrap_or(assets);
+ // The baseline is read from inside that same directory switch, so it needs
+ // resolving up front for the same reason. A relative `--baseline` would
+ // otherwise silently resolve to nothing and report every cell as new.
+ let mut args = args;
+ if let Some(baseline) = args.baseline.take() {
+ match fs::canonicalize(&baseline) {
+ Ok(path) => args.baseline = Some(path),
+ Err(e) => {
+ eprintln!("Could not read baseline {}: {e}", baseline.display());
+ std::process::exit(1);
+ }
+ }
+ }
+ let args = args;
+
let mut sources = Vec::new();
for path in paths {
let text = match fs::read_to_string(&path) {
diff --git a/src/Cargo.toml b/src/Cargo.toml
index 3c8c8ec5..2c6734a9 100644
--- a/src/Cargo.toml
+++ b/src/Cargo.toml
@@ -39,8 +39,10 @@ adbc_core = { version = "0.23", optional = true }
# Spatial
geozero = { workspace = true, optional = true, features = ["with-wkb", "with-wkt", "with-geojson"] }
-# Backend for the PNG writer (non-default; gated, excluded from the MSRV 1.86 build)
-hephaestus = { version = "0.1.0", optional = true, default-features = false, features = ["vello", "png", "geom-wkb", "geom-wkt"] }
+# Backend for the renderer-backed writers (non-default; gated, excluded from the
+# MSRV 1.86 build). The GPU rasteriser is *not* requested here: `vello` arrives
+# with the `raster` feature, so a build wanting only vector output pulls no wgpu.
+hephaestus = { version = "0.4.0", optional = true, default-features = false, features = ["geom-wkb", "geom-wkt"] }
# Serialization
serde.workspace = true
@@ -73,6 +75,14 @@ adbc = ["dep:adbc_core"]
odbc = ["dep:toml_edit", "dep:libloading"]
spatial = ["dep:geozero", "rusqlite?/load_extension"]
vegalite = []
-png = ["dep:hephaestus"]
+# Internal, enabled by the writer features below rather than named directly.
+# `graphics` is the shared plot-composition layer; `raster` adds the GPU
+# rasteriser on top of it. Splitting them is what lets a vector-only build skip
+# wgpu, vello and pollster entirely — hephaestus gates only `backend::vello`
+# behind that feature, not the plot layer.
+graphics = ["dep:hephaestus"]
+raster = ["graphics", "hephaestus/vello"]
+
+png = ["raster", "hephaestus/png"]
builtin-data = []
all-readers = ["duckdb", "sqlite", "odbc"]
diff --git a/src/writer/hephaestus/canvas.rs b/src/writer/hephaestus/canvas.rs
new file mode 100644
index 00000000..dc0b1acb
--- /dev/null
+++ b/src/writer/hephaestus/canvas.rs
@@ -0,0 +1,169 @@
+//! The canvas configuration every renderer-backed writer carries.
+//!
+//! Raster and vector output both need concrete dimensions and a resolution —
+//! unlike the resolution-independent Vega-Lite writer — so the size, DPI and
+//! background live here rather than being restated by each writer. A writer adds
+//! only the keys its own format has: a JPEG quality, a TIFF compression.
+
+use hephaestus::color::{rgba, Color};
+use hephaestus::geometry::Size;
+
+use super::scales::parse_color;
+use crate::writer::WriterOptions;
+use crate::{GgsqlError, Result};
+
+/// Default canvas width in pixels.
+pub(super) const DEFAULT_WIDTH: u32 = 1500;
+/// Default canvas height in pixels.
+pub(super) const DEFAULT_HEIGHT: u32 = 1000;
+/// Default resolution. DPI converts the theme's physical sizes (text, stroke
+/// widths, spacing — all in points) to pixels, so it sets how large the chrome
+/// is relative to the canvas as well as the print size of a physical figure.
+pub(super) const DEFAULT_DPI: f64 = 300.0;
+
+/// Largest canvas dimension accepted, in pixels. Far beyond any real figure, but
+/// small enough that a slipped unit conversion fails with a message instead of
+/// exhausting GPU memory.
+const MAX_DIMENSION: f64 = 32_768.0;
+
+/// Option keys every renderer-backed writer understands.
+///
+/// Concatenated ahead of a writer's own keys when rejecting unknown options, so
+/// the shared ones lead the "supported options" list in the error.
+pub const CANVAS_OPTIONS: &[&str] = &["width", "height", "units", "dpi", "background"];
+
+/// Units a `width` / `height` option may be given in.
+const UNITS: &[&str] = &["px", "in", "cm", "mm", "pt"];
+
+/// Size, resolution and background for one rendered figure.
+#[derive(Debug, Clone, Copy, PartialEq)]
+pub struct Canvas {
+ pub width: u32,
+ pub height: u32,
+ pub dpi: f64,
+ pub background: Color,
+ /// Whether the dimensions were given in a physical unit rather than pixels.
+ ///
+ /// Only the vector backends consult it: a file asked for in inches should
+ /// declare a physical size so it prints at the size it was asked for, while
+ /// one asked for in pixels should stay in pixels.
+ pub physical: bool,
+}
+
+impl Canvas {
+ /// A canvas of the given pixel dimensions and DPI, on white.
+ pub fn new(width: u32, height: u32, dpi: f64) -> Self {
+ Self {
+ width,
+ height,
+ dpi,
+ background: rgba(1.0, 1.0, 1.0, 1.0),
+ physical: false,
+ }
+ }
+
+ /// Set the background painted before anything is drawn.
+ pub fn background(mut self, color: Color) -> Self {
+ self.background = color;
+ self
+ }
+
+ /// Parse the shared keys, rejecting anything outside them or `extra` first.
+ ///
+ /// `extra` is the calling writer's own option names. Rejection happens
+ /// before any value is read, so a mistyped key is reported rather than
+ /// silently ignored.
+ ///
+ /// # Errors
+ ///
+ /// Returns `GgsqlError::WriterError` for an unknown key, an unusable value,
+ /// or a dimension outside the renderable range.
+ pub fn from_options(options: &WriterOptions, extra: &[&str]) -> Result {
+ let known: Vec<&str> = CANVAS_OPTIONS.iter().chain(extra).copied().collect();
+ options.reject_unknown(&known)?;
+
+ let dpi = match options.number("dpi")? {
+ Some(dpi) if dpi > 0.0 => dpi,
+ Some(dpi) => {
+ return Err(GgsqlError::WriterError(format!(
+ "writer option 'dpi' expects a positive number, got '{dpi}'"
+ )))
+ }
+ None => DEFAULT_DPI,
+ };
+ // `units` interprets the dimensions the caller supplies; the defaults are
+ // pixel counts, so they stand whatever the unit is.
+ let units = options.one_of("units", UNITS)?.unwrap_or("px");
+ let width = match options.number("width")? {
+ Some(width) => to_pixels(width, units, dpi, "width")?,
+ None => DEFAULT_WIDTH,
+ };
+ let height = match options.number("height")? {
+ Some(height) => to_pixels(height, units, dpi, "height")?,
+ None => DEFAULT_HEIGHT,
+ };
+
+ let mut canvas = Self::new(width, height, dpi);
+ canvas.physical = units != "px";
+ if let Some(raw) = options.get("background") {
+ // `none` is a familiar spelling of a transparent canvas that CSS
+ // itself doesn't accept as a color.
+ let color = match raw.trim().to_lowercase().as_str() {
+ "none" => rgba(0.0, 0.0, 0.0, 0.0),
+ _ => parse_color(raw).ok_or_else(|| {
+ GgsqlError::WriterError(format!(
+ "writer option 'background' expects a CSS color, got '{raw}'"
+ ))
+ })?,
+ };
+ canvas = canvas.background(color);
+ }
+ Ok(canvas)
+ }
+
+ /// The canvas as a hephaestus size, for `PlotComposition::render`.
+ pub fn size(&self) -> Size {
+ Size::new(self.width as f64, self.height as f64)
+ }
+
+ /// The resolution to record in an output that can carry one.
+ ///
+ /// A file that declares nothing is read as 72 dpi by whatever opens it, so
+ /// an image rendered at a higher resolution would claim the wrong physical
+ /// size.
+ pub fn dpi_hint(&self) -> Option {
+ Some(self.dpi)
+ }
+}
+
+impl Default for Canvas {
+ fn default() -> Self {
+ Self::new(DEFAULT_WIDTH, DEFAULT_HEIGHT, DEFAULT_DPI)
+ }
+}
+
+/// Convert a canvas dimension given in `units` to whole pixels at `dpi`.
+///
+/// A physical unit goes through inches, so the same figure grows with DPI; `px`
+/// is already the canvas unit, where DPI only scales the chrome.
+fn to_pixels(value: f64, units: &str, dpi: f64, key: &str) -> Result {
+ let per_inch = match units {
+ "in" => 1.0,
+ "cm" => 2.54,
+ "mm" => 25.4,
+ "pt" => 72.0,
+ _ => return whole_pixels(value, key),
+ };
+ whole_pixels(value / per_inch * dpi, key)
+}
+
+/// Round a pixel count and reject one outside the renderable range.
+fn whole_pixels(pixels: f64, key: &str) -> Result {
+ let rounded = pixels.round();
+ if !(1.0..=MAX_DIMENSION).contains(&rounded) {
+ return Err(GgsqlError::WriterError(format!(
+ "writer option '{key}' resolves to {rounded} px, outside the supported range 1–{MAX_DIMENSION} px"
+ )));
+ }
+ Ok(rounded as u32)
+}
diff --git a/src/writer/hephaestus/compose.rs b/src/writer/hephaestus/compose.rs
new file mode 100644
index 00000000..788e5a57
--- /dev/null
+++ b/src/writer/hephaestus/compose.rs
@@ -0,0 +1,351 @@
+//! Turning a resolved ggsql `Plot` into a live hephaestus composition.
+//!
+//! Everything up to the point where an output format matters. Each writer calls
+//! [`build_composition`] and then does one format-specific thing with the
+//! result: rasterise it, render it into a vector scene, or serialise it. The
+//! ~200 lines below are therefore shared by all of them, which is why they live
+//! here rather than in any one writer.
+
+use std::collections::HashMap;
+
+use hephaestus::plot::{scale, AspectMode, Plot as HPlot, PlotComposition};
+use hephaestus::scales::chrome::AxisSide;
+use hephaestus::shape::ShapeRegistry;
+
+use super::projection::apply_projection;
+use super::scales::build_scale;
+use super::wiring::Ctx;
+use super::{channels, facet, geom, projection, scales, wiring};
+use crate::naming;
+use crate::plot::layer::geom::GeomType;
+use crate::plot::layer::is_transposed;
+use crate::plot::ParameterValue;
+use crate::{DataFrame, GgsqlError, Layer, Plot, Result};
+
+/// Fraction of a map's bounding-box span added as breathing room around it, so
+/// marks on the boundary are not drawn against the panel edge. Matches the
+/// Vega-Lite writer's projection fit (`span * 1.1`).
+const MAP_PADDING: f64 = 0.1;
+
+/// Reject a plot no renderer-backed writer can draw.
+///
+/// Shared by every one of them, and phrased without naming a format: what
+/// cannot be drawn here is a limit of the composition layer, not of the encoder
+/// the caller happened to pick.
+///
+/// # Errors
+///
+/// Returns `GgsqlError::WriterError` for a plot with no layers, or one whose
+/// geom the composition layer cannot build.
+pub fn validate_plot(spec: &Plot) -> Result<()> {
+ if spec.layers.is_empty() {
+ return Err(GgsqlError::WriterError(
+ "a plot needs at least one layer".into(),
+ ));
+ }
+ for layer in &spec.layers {
+ let geom_type = layer.geom.geom_type();
+ if !geom::is_supported(geom_type) {
+ return Err(GgsqlError::WriterError(format!(
+ "the plot renderer does not support the '{geom_type}' geom yet"
+ )));
+ }
+ }
+ Ok(())
+}
+
+/// Build the composition for `spec`, ready to render at any size.
+///
+/// Layers are built in `spec.layers` order, which is DRAW order, which is
+/// z-order. The caller is expected to have run [`validate_plot`] already.
+///
+/// # Errors
+///
+/// Returns `GgsqlError::WriterError` if a layer's data is missing, a geom
+/// cannot be built, or the assembled composition fails hephaestus's own
+/// validation.
+pub fn build_composition(
+ spec: &Plot,
+ data: &HashMap,
+) -> Result {
+ // FACET → a grid of named panels (a single panel when unfaceted). Each
+ // panel becomes one hephaestus `Plot` sharing the composition's scales.
+ let (composition, panels) = facet::build_panels(spec, data)?;
+ // The composition owns the shape registry backing composition-level legend
+ // glyphs (point markers, line dashes).
+ let mut view = PlotComposition::new(&composition)
+ .shape_registry(ShapeRegistry::with_builtins())
+ .theme(wiring::ggsql_theme());
+
+ // Plot title/subtitle/caption from the LABEL clause. These live on the
+ // composition, not the per-panel plots, so one label spans the whole
+ // figure — which is also correct for the unfaceted 1x1 case (a plot-level
+ // title would resolve to the same layout row and be painted over).
+ if let Some(text) = wiring::plot_label(spec, "title") {
+ view = view.title(text);
+ }
+ if let Some(text) = wiring::plot_label(spec, "subtitle") {
+ view = view.subtitle(text);
+ }
+ if let Some(text) = wiring::plot_label(spec, "caption") {
+ view = view.caption(text);
+ }
+
+ // Axis titles are composition chrome too: one centred title per
+ // dimension for the whole figure, rather than one per panel rail.
+ for (side, text) in projection::composition_axis_titles(spec) {
+ view = view.axis_title(side, text);
+ }
+
+ // Register the fixed (shared) scales once, globally. Every panel binds
+ // its position channels to these names, giving fixed-scale faceting.
+ for scale in &spec.scales {
+ let kind = match scale.aesthetic.as_str() {
+ "fill" | "stroke" => scales::RangeKind::Color,
+ "shape" => scales::RangeKind::Shape,
+ "linetype" => scales::RangeKind::Linetype,
+ // The text geom's font aesthetics: a scale over them resolves a
+ // range of family names / weights, not numbers.
+ "typeface" => scales::RangeKind::Text,
+ "fontweight" => scales::RangeKind::FontWeight,
+ "italic" => scales::RangeKind::Bool,
+ _ => {
+ if scale.aesthetic.starts_with("pos") {
+ scales::RangeKind::Position
+ } else {
+ scales::RangeKind::Number
+ }
+ }
+ };
+ if let Some(hs) = build_scale(scale, kind) {
+ view.insert_scale(scale.aesthetic.clone(), hs);
+ }
+ }
+
+ // Frame a map to its bounding box. Under a `PROJECT map` every mark, the
+ // clip boundary and the graticules share one pre-projected data space, so
+ // the position scales must span the map's extent rather than the marks'
+ // — otherwise the data is zoomed in and drifts off the boundary. A
+ // spatial layer additionally has no `pos1`/`pos2` columns at all (it
+ // positions by geometry), so ggsql resolves no position scales for it and
+ // these are the only ones. The bbox comes from ggsql
+ // (`computed["bbox"]` when projected, else the geometry extent), keeping
+ // the "writer never invents extents" principle.
+ let map_bbox = map_bbox(spec, data)?;
+ if let Some((xmin, ymin, xmax, ymax)) = map_bbox {
+ view.insert_scale("pos1".to_string(), scale::continuous(map_range(xmin, xmax)));
+ view.insert_scale("pos2".to_string(), scale::continuous(map_range(ymin, ymax)));
+ }
+
+ // Legends are collected from the first panel only and registered once on
+ // the composition's own legend ring, so a faceted plot gets a single shared
+ // legend rather than one per panel. Every panel produces the same legends
+ // (all built from the globally resolved scales), so one capture suffices.
+ let legend_sink = std::cell::RefCell::new(Vec::new());
+ let mut legends_captured = false;
+
+ for panel in &panels {
+ // Slice each layer's data to this panel. A Grid cell whose facet
+ // combination doesn't occur in the data still becomes a panel — framed,
+ // axed and strip-labelled like any other, just with no marks — so the
+ // grid stays rectangular and its strips keep describing every row and
+ // column (the ggplot2 look).
+ let slices: Vec<(&Layer, DataFrame)> = spec
+ .layers
+ .iter()
+ .enumerate()
+ .map(|(idx, layer)| {
+ Ok((
+ layer,
+ facet::panel_dataframe(layer_dataframe(layer, idx, data)?, panel)?,
+ ))
+ })
+ .collect::>()?;
+ let empty = slices.iter().all(|(_, df)| df.height() == 0);
+
+ // Fixed dimensions bind the shared `pos1`/`pos2`; free dimensions get
+ // a per-panel scale whose domain is computed from this panel's slices
+ // (the one place the writer computes extents — free facets only).
+ let mut ps = facet::PanelScales::new(spec, panel);
+ let layer_dfs: Vec<&DataFrame> = slices.iter().map(|(_, df)| df).collect();
+ if ps.free_x {
+ match scales::free_position_scale(spec.find_scale("pos1"), &layer_dfs, "pos1") {
+ Some(hs) => view.insert_scale(ps.pos1.clone(), hs),
+ // No panel extent to free the dimension over (an empty cell),
+ // so read the shared scale rather than leave the axis and the
+ // channel bindings pointing at a scale that was never inserted.
+ None => ps.use_shared("pos1"),
+ }
+ }
+ if ps.free_y {
+ match scales::free_position_scale(spec.find_scale("pos2"), &layer_dfs, "pos2") {
+ Some(hs) => view.insert_scale(ps.pos2.clone(), hs),
+ None => ps.use_shared("pos2"),
+ }
+ }
+
+ // Build every layer's geom into this panel; geoms bind channels and
+ // record legends (first panel only) into `legend_sink`, drawing in
+ // layer (DRAW) = z-order. An empty panel builds no geoms — a hephaestus
+ // geom over zero rows has nothing to draw — and so must not count as
+ // the legend-capturing panel either.
+ let panel_legends = (!legends_captured).then_some(&legend_sink);
+ let mut plot = HPlot::new(&composition, panel.id.as_str())
+ .shape_registry(ShapeRegistry::with_builtins());
+ if !empty {
+ for (layer, df) in &slices {
+ let ctx = Ctx {
+ spec,
+ layer,
+ df,
+ transposed: is_transposed(layer),
+ pos1_scale: &ps.pos1,
+ pos2_scale: &ps.pos2,
+ legends: panel_legends,
+ };
+ geom::build_into_plot(&mut plot, &ctx)?;
+ }
+ legends_captured = true;
+ } else {
+ // hephaestus draws a panel's grid lines from the scales bound to
+ // the projection's channels — which a geom would have bound. With
+ // no geoms to do it, bind the position channels here so an empty
+ // cell carries the same grid as its populated neighbours. A
+ // position ggsql resolved no scale for stays unbound, since a
+ // binding to an unregistered scale fails validation.
+ for (channel, name) in [("x", &ps.pos1), ("y", &ps.pos2)] {
+ if view.scale(name).is_some() {
+ plot.set_binding(channel, name.clone());
+ }
+ }
+ }
+
+ // Axes are created per coordinate system, edge-only for fixed scales.
+ plot = apply_projection(plot, spec, panel, &ps);
+
+ // Lock a map panel to square units so the projection keeps its
+ // proportions (a globe stays round), the raster analog of the
+ // Vega-Lite writer's single uniform projection scale.
+ //
+ // `aspect_ratio` is the *data-space* x-unit : y-unit ratio, not a
+ // panel width:height ratio. Map coordinates arrive pre-projected, so
+ // one unit means the same length on both axes and the ratio is 1 —
+ // passing the bbox's own height/width instead stretches every map by
+ // exactly that factor.
+ if map_bbox.is_some() {
+ plot = plot.aspect_ratio(1.0).aspect_mode(AspectMode::Range);
+ }
+
+ // Facet strip labels (Wrap/Grid-column header on top, Grid-row on right).
+ if let Some(text) = &panel.strip_top {
+ plot = plot.strip(AxisSide::Top, text.clone());
+ }
+ if let Some(text) = &panel.strip_right {
+ plot = plot.strip(AxisSide::Right, text.clone());
+ }
+
+ view.attach_plot(plot);
+ }
+
+ // One shared legend for the whole composition (see `legend_sink` above).
+ for legend in legend_sink.into_inner() {
+ view.add_legend(legend);
+ }
+
+ let issues = view.validate();
+ if !issues.is_empty() {
+ return Err(GgsqlError::WriterError(format!(
+ "the plot renderer could not lay this plot out: {issues:?}"
+ )));
+ }
+ Ok(view)
+}
+
+/// The map bounding box `(xmin, ymin, xmax, ymax)`, or `None` when the plot is
+/// not a map. ggsql's resolved `computed["bbox"]` (set under a `PROJECT map`)
+/// wins; a bare `spatial` geom with no projection falls back to the union extent
+/// of its geometry data.
+fn map_bbox(
+ spec: &Plot,
+ data: &HashMap,
+) -> Result> {
+ if let Some(proj) = &spec.project {
+ if let Some(ParameterValue::Array(arr)) = proj.computed.get("bbox") {
+ let nums: Vec = arr.iter().filter_map(|e| e.to_f64()).collect();
+ if let [xmin, ymin, xmax, ymax] = nums[..] {
+ if [xmin, ymin, xmax, ymax].iter().all(|v| v.is_finite()) {
+ return Ok(Some((xmin, ymin, xmax, ymax)));
+ }
+ }
+ }
+ }
+
+ let is_spatial = |layer: &Layer| layer.geom.geom_type() == GeomType::Spatial;
+ if !spec.layers.iter().any(is_spatial) {
+ return Ok(None);
+ }
+
+ let geom_col = naming::aesthetic_column("geometry");
+ let (mut xmin, mut ymin, mut xmax, mut ymax) = (
+ f64::INFINITY,
+ f64::INFINITY,
+ f64::NEG_INFINITY,
+ f64::NEG_INFINITY,
+ );
+ for (idx, layer) in spec
+ .layers
+ .iter()
+ .enumerate()
+ .filter(|(_, l)| is_spatial(l))
+ {
+ let df = layer_dataframe(layer, idx, data)?;
+ if df.column(&geom_col).is_err() {
+ continue;
+ }
+ for g in channels::column_to_geometry(df, &geom_col)? {
+ if let Some((x0, y0, x1, y1)) = g.bounds() {
+ xmin = xmin.min(x0);
+ ymin = ymin.min(y0);
+ xmax = xmax.max(x1);
+ ymax = ymax.max(y1);
+ }
+ }
+ }
+ Ok(
+ (xmin.is_finite() && ymin.is_finite() && xmax.is_finite() && ymax.is_finite())
+ .then_some((xmin, ymin, xmax, ymax)),
+ )
+}
+
+/// A non-degenerate inclusive range for a map's continuous position scale.
+///
+/// The extent is padded by [`MAP_PADDING`] around its centre, matching the
+/// Vega-Lite writer, which fits the projection to `span * 1.1` centred on the
+/// bbox (`vegalite/projection/map.rs`). A zero-width or inverted extent is
+/// widened instead, so the scale can still map it.
+pub(super) fn map_range(min: f64, max: f64) -> std::ops::RangeInclusive {
+ let span = max - min;
+ if span > f64::EPSILON {
+ let pad = span * MAP_PADDING / 2.0;
+ (min - pad)..=(max + pad)
+ } else {
+ (min - 0.5)..=(max + 0.5)
+ }
+}
+
+/// Look up the DataFrame backing a layer by its execution-assigned data key,
+/// falling back to the conventional key for its index as the Vega-Lite writer
+/// does. Execution always assigns the key; the fallback is for a hand-built
+/// `Plot`.
+pub(super) fn layer_dataframe<'a>(
+ layer: &Layer,
+ idx: usize,
+ data: &'a HashMap,
+) -> Result<&'a DataFrame> {
+ let key = layer
+ .data_key
+ .clone()
+ .unwrap_or_else(|| naming::layer_key(idx));
+ data.get(&key)
+ .ok_or_else(|| GgsqlError::WriterError(format!("no data found for layer key '{key}'")))
+}
diff --git a/src/writer/hephaestus/facet.rs b/src/writer/hephaestus/facet.rs
index 78ed2308..baf5733a 100644
--- a/src/writer/hephaestus/facet.rs
+++ b/src/writer/hephaestus/facet.rs
@@ -99,7 +99,7 @@ pub fn build_panels(
let Some(facet) = &spec.facet else {
return Ok(single_panel());
};
- let layer0 = super::layer_dataframe(&spec.layers[0], 0, data)?;
+ let layer0 = super::compose::layer_dataframe(&spec.layers[0], 0, data)?;
match &facet.layout {
FacetLayout::Wrap { .. } => build_wrap(spec, facet, layer0),
FacetLayout::Grid { .. } => build_grid(spec, layer0),
diff --git a/src/writer/hephaestus/geom/densified.rs b/src/writer/hephaestus/geom/densified.rs
index ec418194..3a179470 100644
--- a/src/writer/hephaestus/geom/densified.rs
+++ b/src/writer/hephaestus/geom/densified.rs
@@ -40,7 +40,7 @@ pub fn build(plot: &mut HPlot, ctx: &Ctx) -> Result<()> {
build_and_add::(plot, polygon::spec(ctx), ctx)
}
other => Err(GgsqlError::WriterError(format!(
- "png writer cannot draw a densified '{other}' geom"
+ "the plot renderer cannot draw a densified '{other}' geom"
))),
}
}
diff --git a/src/writer/hephaestus/geom/mod.rs b/src/writer/hephaestus/geom/mod.rs
index ad5cdc67..d1cda890 100644
--- a/src/writer/hephaestus/geom/mod.rs
+++ b/src/writer/hephaestus/geom/mod.rs
@@ -60,7 +60,7 @@ pub fn build_into_plot(plot: &mut HPlot, ctx: &Ctx) -> Result<()> {
GeomType::Boxplot => boxplot::build(plot, ctx),
GeomType::Violin => violin::build(plot, ctx),
other => Err(GgsqlError::WriterError(format!(
- "png writer does not support the '{other}' geom yet"
+ "the plot renderer does not support the '{other}' geom yet"
))),
}
}
diff --git a/src/writer/hephaestus/mod.rs b/src/writer/hephaestus/mod.rs
index 4d8edf7a..2ddd6649 100644
--- a/src/writer/hephaestus/mod.rs
+++ b/src/writer/hephaestus/mod.rs
@@ -1,75 +1,58 @@
-//! PNG raster writer.
+//! Renderer-backed writers.
//!
-//! Renders a resolved ggsql `Spec` to PNG bytes via the [`hephaestus`] 2D scene
-//! renderer. Only [`PngWriter`] is public; the renderer behind it is an
-//! implementation detail.
+//! Every writer here renders a resolved ggsql `Spec` through the [`hephaestus`]
+//! 2D scene renderer. Only the writers themselves are public; the renderer
+//! behind them is an implementation detail, and this module is private.
+//!
+//! The work splits three ways, which is what keeps one writer per format small:
+//!
+//! - [`compose`] turns a `Plot` into a live `PlotComposition`. Format-independent,
+//! and where nearly all the code is.
+//! - [`canvas`] carries the size, resolution and background, and parses the
+//! options they come from.
+//! - [`raster`] rasterises a composition to pixels. **The only part that needs a
+//! GPU adapter** — a vector writer builds a scene from the same composition
+//! and never comes through here.
//!
//! **Scope**: multi-layer plots under Cartesian, Polar, and Map projections,
//! with `FACET` faceting (Wrap/Grid, fixed + free scales); every geom except
-//! `arrow`; all scale types and transforms, material aesthetics, plot and axis
-//! titles, and legends. A geom outside [`geom::is_supported`] is rejected by
-//! [`PngWriter::validate`].
+//! `arrow`, which is a stub no writer implements; all scale types and
+//! transforms, material aesthetics, plot and axis titles, and legends.
//!
//! Architecture — the abstractions and the invariants they keep — and the
//! inventory of deferred work are documented in
//! `src/writer/hephaestus/CLAUDE.md`.
-//!
-//! Rendering uses hephaestus's Vello (GPU) backend, so a working wgpu adapter
-//! (hardware or software, e.g. lavapipe) is required at render time.
+mod canvas;
mod channels;
+mod compose;
mod facet;
mod geom;
mod projection;
+mod raster;
mod scales;
mod wiring;
use std::collections::HashMap;
-use hephaestus::backend::vello::VelloRenderer;
pub use hephaestus::color::{rgba, Color};
-use hephaestus::geometry::Size;
-use hephaestus::plot::{scale, AspectMode, Plot as HPlot, PlotComposition};
-use hephaestus::png::encode_png;
-use hephaestus::scales::chrome::AxisSide;
-use hephaestus::shape::ShapeRegistry;
-use hephaestus::{Renderer, SceneBuilder};
-
-use crate::naming;
-use crate::plot::layer::geom::GeomType;
-use crate::plot::layer::is_transposed;
-use crate::plot::ParameterValue;
-use crate::writer::hephaestus::projection::apply_projection;
-use crate::writer::hephaestus::scales::build_scale;
-use crate::writer::{Writer, WriterOptions};
-use crate::{DataFrame, GgsqlError, Layer, Plot, Result};
-
-use wiring::Ctx;
-
-/// Default canvas width in pixels.
-const DEFAULT_WIDTH: u32 = 1500;
-/// Default canvas height in pixels.
-const DEFAULT_HEIGHT: u32 = 1000;
-/// Default resolution. DPI converts the theme's physical sizes (text, stroke
-/// widths, spacing — all in points) to pixels, so it sets how large the chrome
-/// is relative to the canvas as well as the print size of a physical figure.
-const DEFAULT_DPI: f64 = 300.0;
+#[cfg(feature = "png")]
+use hephaestus::png::{encode_png, PngCompression};
-/// Largest canvas dimension accepted, in pixels. Far beyond any real figure, but
-/// small enough that a slipped unit conversion fails with a message instead of
-/// exhausting GPU memory.
-const MAX_DIMENSION: f64 = 32_768.0;
+pub use canvas::Canvas;
+#[cfg(test)]
+use canvas::{DEFAULT_DPI, DEFAULT_HEIGHT, DEFAULT_WIDTH};
+#[cfg(feature = "raster")]
+pub use raster::RasterRenderer;
-/// Fraction of a map's bounding-box span added as breathing room around it, so
-/// marks on the boundary are not drawn against the panel edge. Matches the
-/// Vega-Lite writer's projection fit (`span * 1.1`).
-const MAP_PADDING: f64 = 0.1;
+use crate::writer::{Writer, WriterOptions};
+use crate::{DataFrame, GgsqlError, Plot, Result};
-/// Option keys [`PngWriter::from_options`] understands.
-const OPTIONS: &[&str] = &["width", "height", "units", "dpi", "background"];
+/// Option keys [`PngWriter`] adds to the shared canvas set.
+const PNG_OPTIONS: &[&str] = &["compression"];
-/// Units a `width` / `height` option may be given in.
-const UNITS: &[&str] = &["px", "in", "cm", "mm", "pt"];
+/// How hard the PNG encoder works to make the file small.
+const COMPRESSION_VALUES: &[&str] = &["none", "fast", "balanced", "small"];
/// Writer that renders a ggsql plot to a PNG image.
///
@@ -85,35 +68,93 @@ const UNITS: &[&str] = &["px", "in", "cm", "mm", "pt"];
/// | `units` | `px`, `in`, `cm`, `mm`, or `pt` — how `width`/`height` are read | `px` |
/// | `dpi` | Pixels per inch; converts physical sizes, including `units` | 300 |
/// | `background` | Any CSS color, e.g. `white`, `#ff0000`, `transparent` | `white` |
-#[derive(Debug, Clone, PartialEq)]
+/// | `compression` | `none`, `fast`, `balanced`, or `small` | `balanced` |
+///
+/// `compression` trades encode time against file size, losslessly either way.
+/// `balanced` is what a file wants. `fast` is for a caller on a frame deadline —
+/// a host encoding a plot per resize, say — where it costs a fraction of the
+/// time for about half again the bytes.
+///
+/// Rendering requires a working wgpu adapter (hardware or software, e.g.
+/// lavapipe) at render time.
+#[derive(Debug, Clone, Copy, PartialEq)]
pub struct PngWriter {
- width: u32,
- height: u32,
- dpi: f64,
- background: Color,
+ canvas: Canvas,
+ compression: PngCompression,
}
impl PngWriter {
/// Create a writer for the given pixel dimensions and DPI, white background.
pub fn new(width: u32, height: u32, dpi: f64) -> Self {
Self {
- width,
- height,
- dpi,
- background: rgba(1.0, 1.0, 1.0, 1.0),
+ canvas: Canvas::new(width, height, dpi),
+ compression: PngCompression::Balanced,
}
}
/// Set the background color used to clear the canvas before rendering.
pub fn background(mut self, color: Color) -> Self {
- self.background = color;
+ self.canvas = self.canvas.background(color);
self
}
+
+ /// Set how hard the encoder works to make the file small.
+ pub fn compression(mut self, compression: PngCompression) -> Self {
+ self.compression = compression;
+ self
+ }
+
+ /// Render through a renderer the caller keeps, rather than building one.
+ ///
+ /// Constructing a [`RasterRenderer`] creates a GPU device and compiles the
+ /// rasteriser's shaders, so a host rendering more than one figure should
+ /// build one once and pass it here.
+ ///
+ /// # Errors
+ ///
+ /// Returns `GgsqlError::WriterError` if the plot cannot be composed, the
+ /// render fails, or the encode fails.
+ pub fn write_with(
+ &self,
+ spec: &Plot,
+ data: &HashMap,
+ renderer: &mut RasterRenderer,
+ ) -> Result> {
+ compose::validate_plot(spec)?;
+ let mut view = compose::build_composition(spec, data)?;
+ let pixels = raster::render_rgba8(&mut view, &self.canvas, renderer)?;
+ // `render_to_buffer` hands out straight (un-premultiplied) alpha, which
+ // is exactly what PNG stores, so the buffer encodes as-is.
+ encode_png(
+ self.canvas.width,
+ self.canvas.height,
+ &pixels,
+ self.compression,
+ self.canvas.dpi_hint(),
+ )
+ .map_err(|e| GgsqlError::WriterError(format!("png encode failed: {e}")))
+ }
+
+ /// [`Self::write_with`] from a resolved `Spec`.
+ ///
+ /// # Errors
+ ///
+ /// As [`Self::write_with`].
+ pub fn render_with(
+ &self,
+ spec: &crate::reader::Spec,
+ renderer: &mut RasterRenderer,
+ ) -> Result> {
+ self.write_with(spec.plot(), spec.data(), renderer)
+ }
}
impl Default for PngWriter {
fn default() -> Self {
- Self::new(DEFAULT_WIDTH, DEFAULT_HEIGHT, DEFAULT_DPI)
+ Self {
+ canvas: Canvas::default(),
+ compression: PngCompression::Balanced,
+ }
}
}
@@ -121,411 +162,29 @@ impl Writer for PngWriter {
type Output = Vec;
fn from_options(options: &WriterOptions) -> Result {
- options.reject_unknown(OPTIONS)?;
-
- let dpi = match options.number("dpi")? {
- Some(dpi) if dpi > 0.0 => dpi,
- Some(dpi) => {
- return Err(GgsqlError::WriterError(format!(
- "writer option 'dpi' expects a positive number, got '{dpi}'"
- )))
- }
- None => DEFAULT_DPI,
+ let canvas = Canvas::from_options(options, PNG_OPTIONS)?;
+ let compression = match options.one_of("compression", COMPRESSION_VALUES)? {
+ Some("none") => PngCompression::None,
+ Some("fast") => PngCompression::Fast,
+ Some("small") => PngCompression::Small,
+ _ => PngCompression::Balanced,
};
- // `units` interprets the dimensions the caller supplies; the defaults are
- // pixel counts, so they stand whatever the unit is.
- let units = options.one_of("units", UNITS)?.unwrap_or("px");
- let width = match options.number("width")? {
- Some(width) => to_pixels(width, units, dpi, "width")?,
- None => DEFAULT_WIDTH,
- };
- let height = match options.number("height")? {
- Some(height) => to_pixels(height, units, dpi, "height")?,
- None => DEFAULT_HEIGHT,
- };
-
- let mut writer = Self::new(width, height, dpi);
- if let Some(raw) = options.get("background") {
- // `none` is a familiar spelling of a transparent canvas that CSS
- // itself doesn't accept as a color.
- let color = match raw.trim().to_lowercase().as_str() {
- "none" => rgba(0.0, 0.0, 0.0, 0.0),
- _ => scales::parse_color(raw).ok_or_else(|| {
- GgsqlError::WriterError(format!(
- "writer option 'background' expects a CSS color, got '{raw}'"
- ))
- })?,
- };
- writer = writer.background(color);
- }
- Ok(writer)
+ Ok(Self {
+ canvas,
+ compression,
+ })
}
fn validate(&self, spec: &Plot) -> Result<()> {
- if spec.layers.is_empty() {
- return Err(GgsqlError::WriterError(
- "png writer requires at least one layer".into(),
- ));
- }
- for layer in &spec.layers {
- let geom_type = layer.geom.geom_type();
- if !geom::is_supported(geom_type) {
- return Err(GgsqlError::WriterError(format!(
- "png writer does not support the '{geom_type}' geom yet"
- )));
- }
- }
- Ok(())
+ compose::validate_plot(spec)
}
fn write(&self, spec: &Plot, data: &HashMap) -> Result {
- self.validate(spec)?;
-
- // FACET → a grid of named panels (a single panel when unfaceted). Each
- // panel becomes one hephaestus `Plot` sharing the composition's scales.
- let (composition, panels) = facet::build_panels(spec, data)?;
- // The composition owns the shape registry backing composition-level legend
- // glyphs (point markers, line dashes).
- let mut view = PlotComposition::new(&composition)
- .shape_registry(ShapeRegistry::with_builtins())
- .theme(wiring::ggsql_theme());
-
- // Plot title/subtitle/caption from the LABEL clause. These live on the
- // composition, not the per-panel plots, so one label spans the whole
- // figure — which is also correct for the unfaceted 1x1 case (a plot-level
- // title would resolve to the same layout row and be painted over).
- if let Some(text) = wiring::plot_label(spec, "title") {
- view = view.title(text);
- }
- if let Some(text) = wiring::plot_label(spec, "subtitle") {
- view = view.subtitle(text);
- }
- if let Some(text) = wiring::plot_label(spec, "caption") {
- view = view.caption(text);
- }
-
- // Axis titles are composition chrome too: one centred title per
- // dimension for the whole figure, rather than one per panel rail.
- for (side, text) in projection::composition_axis_titles(spec) {
- view = view.axis_title(side, text);
- }
-
- // Register the fixed (shared) scales once, globally. Every panel binds
- // its position channels to these names, giving fixed-scale faceting.
- for scale in &spec.scales {
- let kind = match scale.aesthetic.as_str() {
- "fill" | "stroke" => scales::RangeKind::Color,
- "shape" => scales::RangeKind::Shape,
- "linetype" => scales::RangeKind::Linetype,
- // The text geom's font aesthetics: a scale over them resolves a
- // range of family names / weights, not numbers.
- "typeface" => scales::RangeKind::Text,
- "fontweight" => scales::RangeKind::FontWeight,
- "italic" => scales::RangeKind::Bool,
- _ => {
- if scale.aesthetic.starts_with("pos") {
- scales::RangeKind::Position
- } else {
- scales::RangeKind::Number
- }
- }
- };
- if let Some(hs) = build_scale(scale, kind) {
- view.insert_scale(scale.aesthetic.clone(), hs);
- }
- }
-
- // Frame a map to its bounding box. Under a `PROJECT map` every mark, the
- // clip boundary and the graticules share one pre-projected data space, so
- // the position scales must span the map's extent rather than the marks'
- // — otherwise the data is zoomed in and drifts off the boundary. A
- // spatial layer additionally has no `pos1`/`pos2` columns at all (it
- // positions by geometry), so ggsql resolves no position scales for it and
- // these are the only ones. The bbox comes from ggsql
- // (`computed["bbox"]` when projected, else the geometry extent), keeping
- // the "writer never invents extents" principle.
- let map_bbox = map_bbox(spec, data)?;
- if let Some((xmin, ymin, xmax, ymax)) = map_bbox {
- view.insert_scale("pos1".to_string(), scale::continuous(map_range(xmin, xmax)));
- view.insert_scale("pos2".to_string(), scale::continuous(map_range(ymin, ymax)));
- }
-
- // Legends are collected from the first panel only and registered once on
- // the composition's own legend ring, so a faceted plot gets a single shared
- // legend rather than one per panel. Every panel produces the same legends
- // (all built from the globally resolved scales), so one capture suffices.
- let legend_sink = std::cell::RefCell::new(Vec::new());
- let mut legends_captured = false;
-
- for panel in &panels {
- // Slice each layer's data to this panel. A Grid cell whose facet
- // combination doesn't occur in the data still becomes a panel — framed,
- // axed and strip-labelled like any other, just with no marks — so the
- // grid stays rectangular and its strips keep describing every row and
- // column (the ggplot2 look).
- let slices: Vec<(&Layer, DataFrame)> = spec
- .layers
- .iter()
- .enumerate()
- .map(|(idx, layer)| {
- Ok((
- layer,
- facet::panel_dataframe(layer_dataframe(layer, idx, data)?, panel)?,
- ))
- })
- .collect::>()?;
- let empty = slices.iter().all(|(_, df)| df.height() == 0);
-
- // Fixed dimensions bind the shared `pos1`/`pos2`; free dimensions get
- // a per-panel scale whose domain is computed from this panel's slices
- // (the one place the writer computes extents — free facets only).
- let mut ps = facet::PanelScales::new(spec, panel);
- let layer_dfs: Vec<&DataFrame> = slices.iter().map(|(_, df)| df).collect();
- if ps.free_x {
- match scales::free_position_scale(spec.find_scale("pos1"), &layer_dfs, "pos1") {
- Some(hs) => view.insert_scale(ps.pos1.clone(), hs),
- // No panel extent to free the dimension over (an empty cell),
- // so read the shared scale rather than leave the axis and the
- // channel bindings pointing at a scale that was never inserted.
- None => ps.use_shared("pos1"),
- }
- }
- if ps.free_y {
- match scales::free_position_scale(spec.find_scale("pos2"), &layer_dfs, "pos2") {
- Some(hs) => view.insert_scale(ps.pos2.clone(), hs),
- None => ps.use_shared("pos2"),
- }
- }
-
- // Build every layer's geom into this panel; geoms bind channels and
- // record legends (first panel only) into `legend_sink`, drawing in
- // layer (DRAW) = z-order. An empty panel builds no geoms — a hephaestus
- // geom over zero rows has nothing to draw — and so must not count as
- // the legend-capturing panel either.
- let panel_legends = (!legends_captured).then_some(&legend_sink);
- let mut plot = HPlot::new(&composition, panel.id.as_str())
- .shape_registry(ShapeRegistry::with_builtins());
- if !empty {
- for (layer, df) in &slices {
- let ctx = Ctx {
- spec,
- layer,
- df,
- transposed: is_transposed(layer),
- pos1_scale: &ps.pos1,
- pos2_scale: &ps.pos2,
- legends: panel_legends,
- };
- geom::build_into_plot(&mut plot, &ctx)?;
- }
- legends_captured = true;
- } else {
- // hephaestus draws a panel's grid lines from the scales bound to
- // the projection's channels — which a geom would have bound. With
- // no geoms to do it, bind the position channels here so an empty
- // cell carries the same grid as its populated neighbours. A
- // position ggsql resolved no scale for stays unbound, since a
- // binding to an unregistered scale fails validation.
- for (channel, name) in [("x", &ps.pos1), ("y", &ps.pos2)] {
- if view.scale(name).is_some() {
- plot.set_binding(channel, name.clone());
- }
- }
- }
-
- // Axes are created per coordinate system, edge-only for fixed scales.
- plot = apply_projection(plot, spec, panel, &ps);
-
- // Lock a map panel to square units so the projection keeps its
- // proportions (a globe stays round), the raster analog of the
- // Vega-Lite writer's single uniform projection scale.
- //
- // `aspect_ratio` is the *data-space* x-unit : y-unit ratio, not a
- // panel width:height ratio. Map coordinates arrive pre-projected, so
- // one unit means the same length on both axes and the ratio is 1 —
- // passing the bbox's own height/width instead stretches every map by
- // exactly that factor.
- if map_bbox.is_some() {
- plot = plot.aspect_ratio(1.0).aspect_mode(AspectMode::Range);
- }
-
- // Facet strip labels (Wrap/Grid-column header on top, Grid-row on right).
- if let Some(text) = &panel.strip_top {
- plot = plot.strip(AxisSide::Top, text.clone());
- }
- if let Some(text) = &panel.strip_right {
- plot = plot.strip(AxisSide::Right, text.clone());
- }
-
- view.attach_plot(plot);
- }
-
- // One shared legend for the whole composition (see `legend_sink` above).
- for legend in legend_sink.into_inner() {
- view.add_legend(legend);
- }
-
- let issues = view.validate();
- if !issues.is_empty() {
- return Err(GgsqlError::WriterError(format!(
- "png writer composition validation failed: {issues:?}"
- )));
- }
-
- render_png(
- &mut view,
- self.width,
- self.height,
- self.dpi,
- self.background,
- )
- }
-}
-
-/// Convert a canvas dimension given in `units` to whole pixels at `dpi`.
-///
-/// A physical unit goes through inches, so the same figure grows with DPI; `px`
-/// is already the canvas unit, where DPI only scales the chrome.
-fn to_pixels(value: f64, units: &str, dpi: f64, key: &str) -> Result {
- let per_inch = match units {
- "in" => 1.0,
- "cm" => 2.54,
- "mm" => 25.4,
- "pt" => 72.0,
- _ => return whole_pixels(value, key),
- };
- whole_pixels(value / per_inch * dpi, key)
-}
-
-/// Round a pixel count and reject one outside the renderable range.
-fn whole_pixels(pixels: f64, key: &str) -> Result {
- let rounded = pixels.round();
- if !(1.0..=MAX_DIMENSION).contains(&rounded) {
- return Err(GgsqlError::WriterError(format!(
- "writer option '{key}' resolves to {rounded} px, outside the supported range 1–{MAX_DIMENSION} px"
- )));
- }
- Ok(rounded as u32)
-}
-
-/// The map bounding box `(xmin, ymin, xmax, ymax)`, or `None` when the plot is
-/// not a map. ggsql's resolved `computed["bbox"]` (set under a `PROJECT map`)
-/// wins; a bare `spatial` geom with no projection falls back to the union extent
-/// of its geometry data.
-fn map_bbox(
- spec: &Plot,
- data: &HashMap,
-) -> Result> {
- if let Some(proj) = &spec.project {
- if let Some(ParameterValue::Array(arr)) = proj.computed.get("bbox") {
- let nums: Vec = arr.iter().filter_map(|e| e.to_f64()).collect();
- if let [xmin, ymin, xmax, ymax] = nums[..] {
- if [xmin, ymin, xmax, ymax].iter().all(|v| v.is_finite()) {
- return Ok(Some((xmin, ymin, xmax, ymax)));
- }
- }
- }
- }
-
- let is_spatial = |layer: &Layer| layer.geom.geom_type() == GeomType::Spatial;
- if !spec.layers.iter().any(is_spatial) {
- return Ok(None);
- }
-
- let geom_col = naming::aesthetic_column("geometry");
- let (mut xmin, mut ymin, mut xmax, mut ymax) = (
- f64::INFINITY,
- f64::INFINITY,
- f64::NEG_INFINITY,
- f64::NEG_INFINITY,
- );
- for (idx, layer) in spec
- .layers
- .iter()
- .enumerate()
- .filter(|(_, l)| is_spatial(l))
- {
- let df = layer_dataframe(layer, idx, data)?;
- if df.column(&geom_col).is_err() {
- continue;
- }
- for g in channels::column_to_geometry(df, &geom_col)? {
- if let Some((x0, y0, x1, y1)) = g.bounds() {
- xmin = xmin.min(x0);
- ymin = ymin.min(y0);
- xmax = xmax.max(x1);
- ymax = ymax.max(y1);
- }
- }
- }
- Ok(
- (xmin.is_finite() && ymin.is_finite() && xmax.is_finite() && ymax.is_finite())
- .then_some((xmin, ymin, xmax, ymax)),
- )
-}
-
-/// A non-degenerate inclusive range for a map's continuous position scale.
-///
-/// The extent is padded by [`MAP_PADDING`] around its centre, matching the
-/// Vega-Lite writer, which fits the projection to `span * 1.1` centred on the
-/// bbox (`vegalite/projection/map.rs`). A zero-width or inverted extent is
-/// widened instead, so the scale can still map it.
-fn map_range(min: f64, max: f64) -> std::ops::RangeInclusive {
- let span = max - min;
- if span > f64::EPSILON {
- let pad = span * MAP_PADDING / 2.0;
- (min - pad)..=(max + pad)
- } else {
- (min - 0.5)..=(max + 0.5)
+ let mut renderer = RasterRenderer::new()?;
+ self.write_with(spec, data, &mut renderer)
}
}
-/// Look up the DataFrame backing a layer by its execution-assigned data key,
-/// falling back to the conventional key for its index as the Vega-Lite writer
-/// does. Execution always assigns the key; the fallback is for a hand-built
-/// `Plot`.
-fn layer_dataframe<'a>(
- layer: &Layer,
- idx: usize,
- data: &'a HashMap,
-) -> Result<&'a DataFrame> {
- let key = layer
- .data_key
- .clone()
- .unwrap_or_else(|| naming::layer_key(idx));
- data.get(&key)
- .ok_or_else(|| GgsqlError::WriterError(format!("no data found for layer key '{key}'")))
-}
-
-/// Render the composition to an RGBA8 buffer and encode it as PNG bytes.
-fn render_png(
- view: &mut PlotComposition,
- width: u32,
- height: u32,
- dpi: f64,
- background: Color,
-) -> Result> {
- let mut renderer = VelloRenderer::new().map_err(|e| {
- GgsqlError::WriterError(format!("could not initialise the GPU renderer: {e}"))
- })?;
- {
- let scene = renderer.scene();
- scene.clear();
- view.render(scene, Size::new(width as f64, height as f64), dpi);
- }
- let mut pixels = vec![0u8; (width as usize) * (height as usize) * 4];
- renderer
- .render_to_buffer(width, height, background, &mut pixels)
- .map_err(|e| GgsqlError::WriterError(format!("png render failed: {e}")))?;
-
- // `render_to_buffer` hands out straight (un-premultiplied) alpha, which is
- // exactly what PNG stores, so the buffer encodes as-is.
- encode_png(width, height, &pixels)
- .map_err(|e| GgsqlError::WriterError(format!("PNG encode failed: {e}")))
-}
-
-/// `from_options` tests. Separate from the render suite below because they need
-/// neither a reader nor a GPU.
#[cfg(test)]
mod option_tests {
use super::*;
@@ -537,16 +196,18 @@ mod option_tests {
/// The writer's canvas as `(width, height, dpi)`.
fn canvas(pairs: &[&str]) -> (u32, u32, f64) {
let writer = writer(pairs).unwrap();
- (writer.width, writer.height, writer.dpi)
+ let c = writer.canvas;
+ (c.width, c.height, c.dpi)
}
#[test]
fn no_options_gives_the_defaults() {
assert_eq!(canvas(&[]), (DEFAULT_WIDTH, DEFAULT_HEIGHT, DEFAULT_DPI));
let default = PngWriter::default();
- assert_eq!(canvas(&[]), (default.width, default.height, default.dpi));
+ let dc = default.canvas;
+ assert_eq!(canvas(&[]), (dc.width, dc.height, dc.dpi));
// White, as `new()` sets it.
- let background = writer(&[]).unwrap().background;
+ let background = writer(&[]).unwrap().canvas.background;
assert_eq!(background.components, [1.0, 1.0, 1.0, 1.0]);
}
@@ -584,10 +245,10 @@ mod option_tests {
#[test]
fn background_accepts_css_colors() {
- let red = writer(&["background=#ff0000"]).unwrap().background;
+ let red = writer(&["background=#ff0000"]).unwrap().canvas.background;
assert_eq!(red.components, [1.0, 0.0, 0.0, 1.0]);
for spelling in ["background=transparent", "background=none"] {
- let clear = writer(&[spelling]).unwrap().background;
+ let clear = writer(&[spelling]).unwrap().canvas.background;
assert_eq!(
clear.components[3], 0.0,
"{spelling} should be fully transparent"
@@ -625,6 +286,7 @@ mod option_tests {
mod tests {
use super::*;
use crate::reader::{DuckDBReader, Reader};
+ use hephaestus::scales::chrome::AxisSide;
fn render(query: &str) -> Result> {
let reader = DuckDBReader::from_connection_string("duckdb://memory").unwrap();
@@ -1740,7 +1402,7 @@ mod tests {
fn map_range_pads_like_vegalite() {
// 10% of the span, split evenly around the centre — the same framing
// Vega-Lite's projection fit produces from `span * 1.1`.
- let r = map_range(0.0, 10.0);
+ let r = compose::map_range(0.0, 10.0);
assert_eq!(*r.start(), -0.5);
assert_eq!(*r.end(), 10.5);
assert_eq!((r.end() - r.start()) / 10.0, 1.1);
@@ -1749,7 +1411,7 @@ mod tests {
#[test]
fn map_range_widens_a_degenerate_extent() {
// A single point has no span to pad, so it is widened to a mappable one.
- let r = map_range(3.0, 3.0);
+ let r = compose::map_range(3.0, 3.0);
assert_eq!(*r.start(), 2.5);
assert_eq!(*r.end(), 3.5);
}
diff --git a/src/writer/hephaestus/raster.rs b/src/writer/hephaestus/raster.rs
new file mode 100644
index 00000000..e875065e
--- /dev/null
+++ b/src/writer/hephaestus/raster.rs
@@ -0,0 +1,59 @@
+//! Rasterising a composition to pixels.
+//!
+//! The one module that names a GPU renderer, and the only part of the writer
+//! that needs an adapter at all: the vector and document writers build a scene
+//! or a byte string from the same `PlotComposition` and never come through here.
+
+use hephaestus::backend::vello::VelloRenderer;
+use hephaestus::plot::PlotComposition;
+use hephaestus::{Renderer, SceneBuilder};
+
+use super::canvas::Canvas;
+use crate::{GgsqlError, Result};
+
+/// A GPU renderer held across renders.
+///
+/// Constructing one creates a wgpu device and compiles the rasteriser's
+/// shaders, which is far too expensive to repeat per figure. A host rendering
+/// more than one plot — a kernel serving a plot pane, a batch job — should keep
+/// one of these and hand it to `render_with`; a one-shot caller can ignore it
+/// and let the writer make its own.
+pub struct RasterRenderer(VelloRenderer);
+
+impl RasterRenderer {
+ /// Initialise the renderer, which requires a working GPU adapter.
+ ///
+ /// # Errors
+ ///
+ /// Returns `GgsqlError::WriterError` when no adapter is available, or when
+ /// one is but the rasteriser could not be set up on it. The two are worth
+ /// telling apart by a caller that falls back to a different output format,
+ /// so the message names which happened.
+ pub fn new() -> Result {
+ VelloRenderer::new().map(Self).map_err(|e| {
+ GgsqlError::WriterError(format!("could not initialise the GPU renderer: {e}"))
+ })
+ }
+}
+
+/// Draw `view` at the canvas's size and resolution and read the pixels back.
+///
+/// Returns RGBA8 with straight (un-premultiplied) alpha, `width * height * 4`
+/// bytes, which is what every raster encoder here expects.
+pub fn render_rgba8(
+ view: &mut PlotComposition,
+ canvas: &Canvas,
+ renderer: &mut RasterRenderer,
+) -> Result> {
+ {
+ let scene = renderer.0.scene();
+ scene.clear();
+ view.render(scene, canvas.size(), canvas.dpi);
+ }
+ let mut pixels = vec![0u8; (canvas.width as usize) * (canvas.height as usize) * 4];
+ renderer
+ .0
+ .render_to_buffer(canvas.width, canvas.height, canvas.background, &mut pixels)
+ .map_err(|e| GgsqlError::WriterError(format!("render failed: {e}")))?;
+ Ok(pixels)
+}
diff --git a/src/writer/hephaestus/wiring.rs b/src/writer/hephaestus/wiring.rs
index c10b3459..35d3758f 100644
--- a/src/writer/hephaestus/wiring.rs
+++ b/src/writer/hephaestus/wiring.rs
@@ -7,11 +7,10 @@ use std::collections::HashSet;
use hephaestus::color::{rgb8, Color};
use hephaestus::plot::chrome::legend::{Legend, LegendKeySpec};
use hephaestus::plot::geom::{BuildableGeom, Geom, GeomBuilder, Raw};
-use hephaestus::plot::theme::{Element, Length, RectElement, Theme, DEFAULT_TEXT_LINEHEIGHT};
+use hephaestus::plot::theme::{Element, Length, RectElement, Theme};
use hephaestus::plot::Plot as HPlot;
use hephaestus::scales::chrome::LegendSide;
use hephaestus::scales::value::{DataColumn, Value as HValue};
-use hephaestus::text::rich::{LineHeightSpec, StyleDelta};
use super::channels::{
aesthetic_column_name, build_group_keys, column_to_bool, column_to_channel, column_to_colors,
@@ -43,15 +42,6 @@ use crate::{AestheticValue, DataFrame, GgsqlError, Layer, Plot, Result};
/// `TextRun::new` regardless, so they still draw their markers; they start
/// parsing with no change here once hephaestus reads the flag at those sites
/// (see [Known gaps](CLAUDE.md)).
-/// - **One line height for both text paths.** hephaestus's rich-text sheet gives
-/// its root selector marquee's `1.6` line height, while the plain path uses the
-/// theme's `1.2`. Chrome slots are one-liners whose measured box sets how much
-/// room the layout reserves, so the mismatch made every axis title claim ~0.4
-/// lines more than it draws — shrinking the panel, and by a *different* amount
-/// horizontally, since the y title measures rotated. Folding the theme's line
-/// height onto the sheet's root brings a plain string back to nearly the layout
-/// it had unparsed: ~1pt of the ~3pt it was claiming remains, which is the
-/// rich block model's own box and not something a sheet entry reaches.
pub fn ggsql_theme() -> Theme {
let mut theme = Theme::default();
theme.legend.bar.frame = Element::Set(RectElement {
@@ -61,16 +51,6 @@ pub fn ggsql_theme() -> Theme {
..RectElement::default()
});
theme.text.markdown = Some(true);
- let mut sheet = (*theme.rich_text).clone();
- let base = sheet.get("base").cloned().unwrap_or_default();
- sheet.set(
- "base",
- StyleDelta {
- lineheight: Some(LineHeightSpec::Mult(DEFAULT_TEXT_LINEHEIGHT)),
- ..base
- },
- );
- theme.rich_text = std::sync::Arc::new(sheet);
theme
}
diff --git a/src/writer/mod.rs b/src/writer/mod.rs
index a0aad469..507897e1 100644
--- a/src/writer/mod.rs
+++ b/src/writer/mod.rs
@@ -42,14 +42,20 @@ pub mod vegalite;
#[cfg(feature = "vegalite")]
pub use vegalite::VegaLiteWriter;
-// The raster writer is backed by the hephaestus renderer, which the module name
-// records. That is an implementation detail: the writer is public as `PngWriter`
-// and the module itself is not part of the API.
-#[cfg(feature = "png")]
+// The renderer-backed writers live in one private module, named after the
+// renderer they share. That name is an implementation detail: each writer is
+// public under its own format's name and the module is not part of the API.
+//
+// Gated on `graphics` — the shared composition layer — rather than on any one
+// format, so adding a writer needs no change here beyond its own re-export.
+#[cfg(feature = "graphics")]
mod hephaestus;
+#[cfg(feature = "graphics")]
+pub use hephaestus::{rgba, Canvas, Color};
+
#[cfg(feature = "png")]
-pub use hephaestus::{rgba, Color, PngWriter};
+pub use hephaestus::{PngWriter, RasterRenderer};
/// Trait for visualization output writers
///
diff --git a/src/writer/options.rs b/src/writer/options.rs
index aa9bc411..241fafa3 100644
--- a/src/writer/options.rs
+++ b/src/writer/options.rs
@@ -110,6 +110,31 @@ impl WriterOptions {
}
}
+ /// The value of `key` parsed as a boolean.
+ ///
+ /// Accepts `true`/`false`, `yes`/`no`, `on`/`off` and `1`/`0`, matching how
+ /// keys are normalised: case and surrounding whitespace are ignored. A
+ /// writer with a flag whose default is `true` still gets `None` for
+ /// "unsupplied", so it can tell that apart from an explicit `false`.
+ ///
+ /// # Errors
+ ///
+ /// Returns `GgsqlError::WriterError` if the value is not one of those
+ /// spellings.
+ pub fn boolean(&self, key: &str) -> Result> {
+ let Some(raw) = self.get(key) else {
+ return Ok(None);
+ };
+ match raw.trim().to_lowercase().as_str() {
+ "true" | "yes" | "on" | "1" => Ok(Some(true)),
+ "false" | "no" | "off" | "0" => Ok(Some(false)),
+ _ => Err(GgsqlError::WriterError(format!(
+ "writer option '{}' expects true or false, got '{raw}'",
+ normalise_key(key)
+ ))),
+ }
+ }
+
/// The value of `key`, checked against a closed set of allowed values.
///
/// Matching ignores case and surrounding whitespace, mirroring how keys are
@@ -244,6 +269,31 @@ mod tests {
assert!(options.number("width").is_err());
}
+ #[test]
+ fn boolean_accepts_the_usual_spellings() {
+ for yes in ["true", "TRUE", " yes ", "on", "1"] {
+ let options = WriterOptions::new().set("embed_fonts", yes);
+ assert_eq!(options.boolean("embed_fonts").unwrap(), Some(true), "{yes}");
+ }
+ for no in ["false", "No", "off", "0"] {
+ let options = WriterOptions::new().set("embed_fonts", no);
+ assert_eq!(options.boolean("embed_fonts").unwrap(), Some(false), "{no}");
+ }
+ // Unsupplied stays distinct from an explicit `false`, so a writer whose
+ // default is `true` can tell them apart.
+ assert_eq!(WriterOptions::new().boolean("embed_fonts").unwrap(), None);
+ }
+
+ #[test]
+ fn boolean_rejects_anything_else() {
+ let options = WriterOptions::new().set("embed_fonts", "maybe");
+ let err = options.boolean("embed_fonts").unwrap_err().to_string();
+ assert!(
+ err.contains("'embed_fonts' expects true or false, got 'maybe'"),
+ "{err}"
+ );
+ }
+
#[test]
fn one_of_matches_case_insensitively() {
let options = WriterOptions::parse(["units=CM"]).unwrap();
From d2684c3479c6bf7db7656fd9e827e2f5e5f56c17 Mon Sep 17 00:00:00 2001
From: Thomas Lin Pedersen
Date: Fri, 4 Sep 2026 15:36:33 +0200
Subject: [PATCH 02/21] all the writers
---
CHANGELOG.md | 28 +
Cargo.lock | 58 ++
ggsql-cli/CLAUDE.md | 17 +-
ggsql-cli/Cargo.toml | 17 +-
ggsql-cli/src/main.rs | 397 ++++------
ggsql-cli/src/writers.rs | 512 +++++++++++++
src/CLAUDE.md | 26 +-
src/Cargo.toml | 22 +
src/writer/hephaestus/CLAUDE.md | 272 +++++--
src/writer/hephaestus/canvas.rs | 128 ++++
src/writer/hephaestus/hep.rs | 268 +++++++
src/writer/hephaestus/jpeg.rs | 219 ++++++
src/writer/hephaestus/mod.rs | 1269 +++++++++++++++++++++----------
src/writer/hephaestus/pdf.rs | 239 ++++++
src/writer/hephaestus/png.rs | 190 +++++
src/writer/hephaestus/raster.rs | 26 +-
src/writer/hephaestus/svg.rs | 307 ++++++++
src/writer/hephaestus/tiff.rs | 184 +++++
src/writer/hephaestus/vector.rs | 36 +
src/writer/hephaestus/webp.rs | 152 ++++
src/writer/mod.rs | 18 +-
src/writer/options.rs | 6 +-
22 files changed, 3638 insertions(+), 753 deletions(-)
create mode 100644 ggsql-cli/src/writers.rs
create mode 100644 src/writer/hephaestus/hep.rs
create mode 100644 src/writer/hephaestus/jpeg.rs
create mode 100644 src/writer/hephaestus/pdf.rs
create mode 100644 src/writer/hephaestus/png.rs
create mode 100644 src/writer/hephaestus/svg.rs
create mode 100644 src/writer/hephaestus/tiff.rs
create mode 100644 src/writer/hephaestus/vector.rs
create mode 100644 src/writer/hephaestus/webp.rs
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 40508bd4..cb157a6f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,28 @@
and the new `minor_breaks` setting have no Vega-Lite equivalent and render
only here. Requires a working GPU adapter — hardware or software, e.g.
lavapipe — at render time.
+- Six more output formats, each with its own writer and its own off-by-default
+ feature: `jpeg`, `tiff`, `webp`, `svg`, `pdf`, and `hep`. Every one takes the
+ same canvas settings as `png` (`width`, `height`, `units`, `dpi`,
+ `background`) plus whatever its own format actually offers — `png` and `tiff`
+ a `compression`, `jpeg` a `quality`, `svg` a `text` mode with `embed-fonts`
+ and `id-prefix`, `pdf` a `compress` and `links`, `hep` a `lossy` and
+ `embed-fonts`. `webp` has none: it is lossless with no rate control, and on
+ plot content it is both about as fast to encode as `png compression=fast` and
+ roughly half the size, which makes it the best default for a raster plot sent
+ over a wire.
+
+ **`svg`, `pdf` and `hep` need no GPU adapter and no wgpu at all** — they
+ record the same drawing commands the rasteriser would have executed, so they
+ work on a headless box, in a container with no graphics stack, and in CI. They
+ also build on Rust 1.86, so they remain available to the R bindings.
+
+ `svg` and `pdf` produce resolution-independent output whose text stays
+ selectable, and a canvas given in a physical unit is declared as one, so
+ `-D 'width=6;height=4;units=in;dpi=300'` yields a file that prints six inches
+ wide. `hep` produces no picture at all: it captures the resolved plot —
+ scales, breaks, labels, theme, geometry and data — so a host can render it
+ itself at any size and re-render on resize without re-running the query.
- Writers can be configured from key–value options: `Writer::from_options` takes
a `WriterOptions` set, and the CLI collects them from a repeatable
`--writer-option key=value` flag on `exec` and `run` (short `-D`, also
@@ -38,6 +60,12 @@
the png writer draws them.
### Changed
+- `--writer` now lists every format ggsql knows in its long help, marking the
+ ones the running build does not have and naming the feature that would bring
+ each in — the more common mistake than a misspelled name. `-D`'s long help
+ lists each writer's settings. An unknown writer, a writer whose feature is
+ off, and an unusable setting are all now reported **before** the query runs
+ rather than after.
- The png writer now records its render resolution in the PNG itself, so a
figure rendered above 96 dpi reports its true physical size instead of being
read as 72 dpi by whatever opens it.
diff --git a/Cargo.lock b/Cargo.lock
index 5025f0ef..340b04ff 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -663,6 +663,12 @@ version = "1.5.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "1fd0f2584146f6f2ef48085050886acf353beff7305ebd1ae69500e27c67f64b"
+[[package]]
+name = "byteorder-lite"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8f1fe948ff07f4bd06c30984e69f5b4899c516a3ef74f34df92a2df2ab535495"
+
[[package]]
name = "bytes"
version = "1.11.1"
@@ -2512,14 +2518,20 @@ checksum = "91f060494e66d6e8a9d6cbf513f0f39e212d37a89293b91fc40f61aeb461f9e5"
dependencies = [
"bytemuck",
"clipper2-rust",
+ "flate2",
"futures-intrusive",
+ "image-webp",
+ "jpeg-decoder",
+ "jpeg-encoder",
"kurbo",
"parley",
"peniko",
"png",
"pollster",
"pulldown-cmark",
+ "skrifa 0.44.0",
"thiserror 2.0.18",
+ "tiff",
"vello",
"wgpu",
]
@@ -2827,6 +2839,16 @@ dependencies = [
"icu_properties",
]
+[[package]]
+name = "image-webp"
+version = "0.2.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "525e9ff3e1a4be2fbea1fdf0e98686a6d98b4d8f937e1bf7402245af1909e8c3"
+dependencies = [
+ "byteorder-lite",
+ "quick-error",
+]
+
[[package]]
name = "indexmap"
version = "2.14.0"
@@ -2910,6 +2932,18 @@ dependencies = [
"libc",
]
+[[package]]
+name = "jpeg-decoder"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "00810f1d8b74be64b13dbf3db89ac67740615d6c891f0e7b6179326533011a07"
+
+[[package]]
+name = "jpeg-encoder"
+version = "0.7.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a0370574b86f7eca156b9f298392b5e69a23f8c86f3f865add60bbc2e79467a6"
+
[[package]]
name = "js-sys"
version = "0.3.98"
@@ -3960,6 +3994,12 @@ dependencies = [
"unicase",
]
+[[package]]
+name = "quick-error"
+version = "2.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a993555f31e5a609f617c12db6250dedcac1b0a85076912c436e6fc9b2c8e6a3"
+
[[package]]
name = "quinn"
version = "0.11.9"
@@ -5069,6 +5109,18 @@ dependencies = [
"ordered-float 2.10.1",
]
+[[package]]
+name = "tiff"
+version = "0.11.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b63feaf3343d35b6ca4d50483f94843803b0f51634937cc2ec519fc32232bc52"
+dependencies = [
+ "flate2",
+ "half",
+ "quick-error",
+ "weezl",
+]
+
[[package]]
name = "tiny-keccak"
version = "2.0.2"
@@ -5826,6 +5878,12 @@ dependencies = [
"rustls-pki-types",
]
+[[package]]
+name = "weezl"
+version = "0.1.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a28ac98ddc8b9274cb41bb4d9d4d5c425b6020c50c46f25559911905610b4a88"
+
[[package]]
name = "wgpu"
version = "29.0.3"
diff --git a/ggsql-cli/CLAUDE.md b/ggsql-cli/CLAUDE.md
index f0126ef5..bec43e5f 100644
--- a/ggsql-cli/CLAUDE.md
+++ b/ggsql-cli/CLAUDE.md
@@ -13,7 +13,8 @@ ggsql-cli/
├── examples/
│ └── visual_test.rs Dev harness: renders the doc examples into an HTML report
└── src/
- └── main.rs clap CLI: exec, run, parse, validate, docs, skill
+ ├── main.rs clap CLI: exec, run, parse, validate, docs, skill
+ └── writers.rs The writer registry — one row per writer, plus dispatch
```
The binary name is `ggsql` (not `ggsql-cli`) — that's what release artifacts and `$PATH` see.
@@ -34,7 +35,17 @@ The binary name is `ggsql` (not `ggsql-cli`) — that's what release artifacts a
Only public `ggsql::*` API is used (`reader`, `writer`, `validate`, `parser`, `VERSION`) — this crate has no awareness of internal modules.
-`exec` and `run` share a `WriterSpec { name, options }`: `--writer` names the writer and repeated `--writer-option key=value` flags (short `-D`, visible alias `--writer-options`, several settings per flag when separated by `;`) become a `ggsql::writer::WriterOptions`, parsed up front in `main` so a malformed pair fails before any SQL runs. The two travel together down `cmd_exec` → `exec_with_reader` → `render_spec`, which dispatches on the name and hands the options to `Writer::from_options`. Adding a setting to a writer therefore needs no CLI change; which keys exist is the writer's business, and an unknown one is its error to report. User-facing keys are documented in [`/doc/get_started/tooling/cli.qmd`](../doc/get_started/tooling/cli.qmd).
+`exec` and `run` share their flags through one `#[derive(Args)] RenderArgs` (`--reader`, `--writer`, `-D`, `--output`, `--verbose`) that both subcommands `#[command(flatten)]`, so a flag's help text and default exist once. `RenderArgs::writer()` resolves them into a `WriterSpec { info, options }` **in `main`, before any SQL runs** — an unknown `--writer`, a writer whose feature is off, and a `-D` pair that is not `key=value` all fail there rather than after the query has executed. `WriterSpec` then travels down `cmd_exec` → `exec_with_reader` → `render_spec`.
+
+Which keys a writer accepts is the writer's business, and an unknown one is its error to report — so adding a setting needs no CLI change. User-facing keys are documented in [`/doc/get_started/tooling/cli.qmd`](../doc/get_started/tooling/cli.qmd).
+
+### The writer registry
+
+[`src/writers.rs`](src/writers.rs) holds one `WriterInfo` row per writer: its name and aliases, the cargo feature that compiles it, the `label` used in messages ("PNG", "Vega-Lite JSON"), a `blurb` and an `options` line for help, `compiled: cfg!(feature = "…")`, and a `render` function pointer. Dispatch, `--writer`'s long help, `-D`'s long help and the "unknown writer" message are all generated from that list, so **adding a writer means adding a row and its render function** — nothing else in the CLI changes. Because `compiled` is a field rather than a `#[cfg]` around the row, the help and the error can name a writer this build lacks and say which feature would bring it in, which is the more common mistake than a misspelled name.
+
+Render functions return `Result<(Output, Vec), String>`: the output plus anything the writer had to degrade to produce it. They report failure rather than exiting, so `render_spec` owns how a problem is presented. **Warnings go to stderr unconditionally, not behind `-v`** — something the writer could not express is a defect in the file the user is about to ship, and stderr keeps it out of a piped artifact.
+
+`open_reader(uri) -> Result, String>` is the matching single place for connection strings. `ggsql::reader::Reader` is object-safe on purpose, so every subcommand that needs data shares one function that knows which schemes exist and which of them this build has.
## Build & install
@@ -60,7 +71,7 @@ The macOS codesign step uses [`/entitlements.plist`](../entitlements.plist) at t
default = ["duckdb", "sqlite", "vegalite", "ipc", "parquet", "builtin-data", "odbc"]
```
-Each feature passes through to `ggsql/`. The `vegalite` flag also gates the writer-rendering path in `main.rs` via `#[cfg(feature = "vegalite")]`.
+Each feature passes through to `ggsql/`. A writer feature gates only its own row's render function in `writers.rs`; the row itself is always present.
## Testing
diff --git a/ggsql-cli/Cargo.toml b/ggsql-cli/Cargo.toml
index 5d1ac49d..ca87a0dc 100644
--- a/ggsql-cli/Cargo.toml
+++ b/ggsql-cli/Cargo.toml
@@ -55,10 +55,23 @@ duckdb = ["ggsql/duckdb"]
parquet = ["ggsql/parquet"]
sqlite = ["ggsql/sqlite"]
odbc = ["ggsql/odbc"]
-vegalite = ["ggsql/vegalite"]
-png = ["ggsql/png"]
+# Internal, and enabled by each writer feature rather than named directly: on
+# when at least one writer is compiled in. It lets the code that exists only to
+# serve a writer be gated on one name instead of an `any(...)` list that has to
+# grow with every format.
+any-writer = []
+
+vegalite = ["ggsql/vegalite", "any-writer"]
+png = ["ggsql/png", "any-writer"]
+jpeg = ["ggsql/jpeg", "any-writer"]
+tiff = ["ggsql/tiff", "any-writer"]
+webp = ["ggsql/webp", "any-writer"]
+svg = ["ggsql/svg", "any-writer"]
+pdf = ["ggsql/pdf", "any-writer"]
+hep = ["ggsql/hep", "any-writer"]
builtin-data = ["ggsql/builtin-data"]
all-readers = ["duckdb", "sqlite", "odbc"]
+all-writers = ["vegalite", "png", "jpeg", "tiff", "webp", "svg", "pdf", "hep"]
# cargo-packager configuration for cross-platform installers
[package.metadata.packager]
diff --git a/ggsql-cli/src/main.rs b/ggsql-cli/src/main.rs
index 50ffe60e..9a21ebbf 100644
--- a/ggsql-cli/src/main.rs
+++ b/ggsql-cli/src/main.rs
@@ -4,19 +4,16 @@ ggsql Command Line Interface
Provides commands for executing ggsql queries with various data sources and output formats.
*/
-use clap::{Parser, Subcommand, ValueEnum};
+use clap::{Args, Parser, Subcommand, ValueEnum};
use ggsql::reader::{Reader, Spec};
use ggsql::validate::validate;
-use ggsql::writer::{Writer, WriterOptions};
+use ggsql::writer::WriterOptions;
use ggsql::{parser, VERSION};
use std::io::{IsTerminal, Write};
use std::path::PathBuf;
+use writers::{Output, WriterInfo};
-#[cfg(feature = "vegalite")]
-use ggsql::writer::VegaLiteWriter;
-
-#[cfg(feature = "png")]
-use ggsql::writer::PngWriter;
+mod writers;
mod docs {
include!(concat!(env!("OUT_DIR"), "/docs_data.rs"));
@@ -31,29 +28,65 @@ pub struct Cli {
pub command: Commands,
}
-enum Output {
- Text(String),
- /// Only a raster writer produces bytes, so nothing constructs this when no
- /// such writer is compiled in.
- #[cfg_attr(not(feature = "png"), allow(dead_code))]
- Bin(Vec),
-}
-
/// The writer to render with, plus the `--writer-option` settings for it.
struct WriterSpec {
- name: String,
+ info: &'static WriterInfo,
options: WriterOptions,
}
-impl WriterSpec {
- /// Build from the raw flags, exiting with the parse error if an option is
- /// not `key=value`.
- fn new(name: String, options: Vec) -> Self {
- let options = WriterOptions::parse(options).unwrap_or_else(|e| {
+/// The flags shared by `exec` and `run`: where the data comes from, which
+/// writer renders it, and where the result goes.
+#[derive(Args)]
+pub struct RenderArgs {
+ /// Data source connection string (duckdb://, sqlite://, odbc://)
+ #[arg(short, long, default_value = "duckdb://memory")]
+ pub reader: String,
+
+ /// Output format — run with --help for the writers this build has
+ #[arg(short, long, default_value = "vegalite", long_help = writers::writer_help())]
+ pub writer: String,
+
+ /// Settings for the chosen writer, as `key=value` (repeatable)
+ #[arg(
+ short = 'D',
+ long = "writer-option",
+ visible_alias = "writer-options",
+ value_name = "KEY=VALUE[;...]",
+ long_help = writers::option_help()
+ )]
+ pub writer_options: Vec,
+
+ /// Output file path
+ #[arg(short, long)]
+ pub output: Option,
+
+ /// Show verbose output (execution details, statistics)
+ #[arg(short, long)]
+ pub verbose: bool,
+}
+
+impl RenderArgs {
+ /// Resolve `--writer` and its settings, exiting on an unknown name or a
+ /// setting that is not `key=value`. Both are the user's mistake, and
+ /// neither should be discovered after the SQL has already run.
+ fn writer(&self) -> WriterSpec {
+ let info = writers::find(&self.writer).unwrap_or_else(|| {
+ eprintln!("{}", writers::unknown_writer(&self.writer));
+ std::process::exit(1);
+ });
+ if !info.compiled {
+ eprintln!("{}", writers::not_compiled_message(info));
+ std::process::exit(1);
+ }
+ let options = WriterOptions::parse(self.writer_options.clone()).unwrap_or_else(|e| {
eprintln!("{}", e);
std::process::exit(1);
});
- Self { name, options }
+ if let Err(e) = (info.check)(&options) {
+ eprintln!("{}", e);
+ std::process::exit(1);
+ }
+ WriterSpec { info, options }
}
}
@@ -64,35 +97,8 @@ pub enum Commands {
/// The ggsql query to execute
query: String,
- /// Data source connection string (duckdb://, sqlite://, odbc://)
- #[arg(short, long, default_value = "duckdb://memory")]
- reader: String,
-
- /// Output format: vegalite (JSON), or png (raster image; requires the
- /// `png` feature and a GPU adapter)
- #[arg(short, long, default_value = "vegalite")]
- writer: String,
-
- /// Settings for the chosen writer, as `key=value`. Repeatable, and one
- /// flag may carry several settings separated by `;` (quote it, as most
- /// shells read `;` themselves): `-D 'width=1600;dpi=150'`. The
- /// png writer takes width, height, units, dpi, and background;
- /// the vegalite writer takes none.
- #[arg(
- short = 'D',
- long = "writer-option",
- visible_alias = "writer-options",
- value_name = "KEY=VALUE[;...]"
- )]
- writer_options: Vec,
-
- /// Output file path
- #[arg(short, long)]
- output: Option,
-
- /// Show verbose output (execution details, statistics)
- #[arg(short, long)]
- verbose: bool,
+ #[command(flatten)]
+ render: RenderArgs,
},
/// Execute a ggsql query from a file
@@ -100,35 +106,8 @@ pub enum Commands {
/// Path to .sql file containing ggsql query
file: PathBuf,
- /// Data source connection string (duckdb://, sqlite://, odbc://)
- #[arg(short, long, default_value = "duckdb://memory")]
- reader: String,
-
- /// Output format: vegalite (JSON), or png (raster image; requires the
- /// `png` feature and a GPU adapter)
- #[arg(short, long, default_value = "vegalite")]
- writer: String,
-
- /// Settings for the chosen writer, as `key=value`. Repeatable, and one
- /// flag may carry several settings separated by `;` (quote it, as most
- /// shells read `;` themselves): `-D 'width=1600;dpi=150'`. The
- /// png writer takes width, height, units, dpi, and background;
- /// the vegalite writer takes none.
- #[arg(
- short = 'D',
- long = "writer-option",
- visible_alias = "writer-options",
- value_name = "KEY=VALUE[;...]"
- )]
- writer_options: Vec,
-
- /// Output file path
- #[arg(short, long)]
- output: Option,
-
- /// Show verbose output (execution details, statistics)
- #[arg(short, long)]
- verbose: bool,
+ #[command(flatten)]
+ render: RenderArgs,
},
/// Parse a query and show the AST (for debugging)
@@ -202,34 +181,20 @@ fn main() -> anyhow::Result<()> {
let cli = Cli::parse();
match cli.command {
- Commands::Exec {
- query,
- reader,
- writer,
- writer_options,
- output,
- verbose,
- } => {
- if verbose {
+ Commands::Exec { query, render } => {
+ if render.verbose {
eprintln!("Executing query: {}", query);
}
- let writer = WriterSpec::new(writer, writer_options);
- cmd_exec(query, reader, &writer, output, verbose);
+ let writer = render.writer();
+ cmd_exec(query, &render, &writer);
}
- Commands::Run {
- file,
- reader,
- writer,
- writer_options,
- output,
- verbose,
- } => {
- if verbose {
+ Commands::Run { file, render } => {
+ if render.verbose {
eprintln!("Running query from file: {}", file.display());
}
- let writer = WriterSpec::new(writer, writer_options);
- cmd_run(file, reader, &writer, output, verbose);
+ let writer = render.writer();
+ cmd_run(file, &render, &writer);
}
Commands::Parse { query, format } => {
@@ -256,15 +221,9 @@ fn main() -> anyhow::Result<()> {
Ok(())
}
-fn cmd_run(
- file: PathBuf,
- reader: String,
- writer: &WriterSpec,
- output: Option,
- verbose: bool,
-) {
+fn cmd_run(file: PathBuf, args: &RenderArgs, writer: &WriterSpec) {
match std::fs::read_to_string(&file) {
- Ok(query) => cmd_exec(query, reader, writer, output, verbose),
+ Ok(query) => cmd_exec(query, args, writer),
Err(e) => {
eprintln!("Failed to read file {}: {}", file.display(), e);
std::process::exit(1);
@@ -272,88 +231,71 @@ fn cmd_run(
}
}
-fn cmd_exec(
- query: String,
- reader: String,
- writer: &WriterSpec,
- output: Option,
- verbose: bool,
-) {
- if verbose {
- eprintln!("Reader: {}", reader);
- eprintln!("Writer: {}", writer.name);
- if let Some(ref output_file) = output {
+fn cmd_exec(query: String, args: &RenderArgs, writer: &WriterSpec) {
+ if args.verbose {
+ eprintln!("Reader: {}", args.reader);
+ eprintln!("Writer: {}", writer.info.name);
+ if let Some(ref output_file) = args.output {
eprintln!("Output: {}", output_file.display());
}
}
- if reader.starts_with("duckdb://") {
+ let reader = open_reader(&args.reader).unwrap_or_else(|e| {
+ eprintln!("{}", e);
+ std::process::exit(1);
+ });
+
+ exec_with_reader(&query, reader.as_ref(), args, writer);
+}
+
+/// Open the reader named by a connection string.
+///
+/// `Reader` is object-safe on purpose, so every caller — `exec`, `run` and
+/// anything added later — shares one place that knows which schemes exist and
+/// which of them this build has.
+fn open_reader(uri: &str) -> Result, String> {
+ /// A reader whose scheme is known but whose feature is off. Unused when
+ /// every reader feature happens to be on, which the default build is.
+ #[allow(dead_code)]
+ fn missing(name: &str, feature: &str) -> String {
+ format!("{name} reader not compiled in. Rebuild with --features {feature}")
+ }
+
+ if uri.starts_with("duckdb://") {
#[cfg(feature = "duckdb")]
- {
- let r = match ggsql::reader::DuckDBReader::from_connection_string(&reader) {
- Ok(r) => r,
- Err(e) => {
- eprintln!("Failed to create reader: {}", e);
- std::process::exit(1);
- }
- };
- exec_with_reader(&query, &r, writer, output, verbose);
- }
+ return ggsql::reader::DuckDBReader::from_connection_string(uri)
+ .map(|r| Box::new(r) as Box)
+ .map_err(|e| format!("Failed to create reader: {e}"));
#[cfg(not(feature = "duckdb"))]
- {
- eprintln!("DuckDB reader not compiled in. Rebuild with --features duckdb");
- std::process::exit(1);
- }
- } else if reader.starts_with("sqlite://") {
+ return Err(missing("DuckDB", "duckdb"));
+ }
+
+ if uri.starts_with("sqlite://") {
#[cfg(feature = "sqlite")]
- {
- let r = match ggsql::reader::SqliteReader::from_connection_string(&reader) {
- Ok(r) => r,
- Err(e) => {
- eprintln!("Failed to create reader: {}", e);
- std::process::exit(1);
- }
- };
- exec_with_reader(&query, &r, writer, output, verbose);
- }
+ return ggsql::reader::SqliteReader::from_connection_string(uri)
+ .map(|r| Box::new(r) as Box)
+ .map_err(|e| format!("Failed to create reader: {e}"));
#[cfg(not(feature = "sqlite"))]
- {
- eprintln!("SQLite reader not compiled in. Rebuild with --features sqlite");
- std::process::exit(1);
- }
- } else if reader.starts_with("odbc://") {
+ return Err(missing("SQLite", "sqlite"));
+ }
+
+ if uri.starts_with("odbc://") {
#[cfg(feature = "odbc")]
- {
- let r = match ggsql::reader::OdbcReader::from_connection_string(&reader) {
- Ok(r) => r,
- Err(e) => {
- eprintln!("Failed to create reader: {}", e);
- std::process::exit(1);
- }
- };
- exec_with_reader(&query, &r, writer, output, verbose);
- }
+ return ggsql::reader::OdbcReader::from_connection_string(uri)
+ .map(|r| Box::new(r) as Box)
+ .map_err(|e| format!("Failed to create reader: {e}"));
#[cfg(not(feature = "odbc"))]
- {
- eprintln!("ODBC reader not compiled in. Rebuild with --features odbc");
- std::process::exit(1);
- }
- } else if reader.starts_with("postgres://") || reader.starts_with("postgresql://") {
- eprintln!("PostgreSQL reader is not yet implemented");
- std::process::exit(1);
- } else {
- eprintln!("Unsupported connection string: {}", reader);
- std::process::exit(1);
+ return Err(missing("ODBC", "odbc"));
}
+
+ if uri.starts_with("postgres://") || uri.starts_with("postgresql://") {
+ return Err("PostgreSQL reader is not yet implemented".to_string());
+ }
+
+ Err(format!("Unsupported connection string: {uri}"))
}
-fn exec_with_reader(
- query: &str,
- reader: &R,
- writer: &WriterSpec,
- output: Option,
- verbose: bool,
-) {
+fn exec_with_reader(query: &str, reader: &dyn Reader, args: &RenderArgs, writer: &WriterSpec) {
// Use validate() to check if query has visualization
let validated = match validate(query) {
Ok(v) => v,
@@ -364,7 +306,7 @@ fn exec_with_reader(
};
if !validated.has_visual() {
- if verbose {
+ if args.verbose {
eprintln!("Visualisation is empty. Printing table instead.");
}
print_table_fallback(query, reader, 100);
@@ -380,11 +322,11 @@ fn exec_with_reader(
}
};
- render_spec(spec, writer, output, verbose);
+ render_spec(spec, args, writer);
}
-fn render_spec(spec: Spec, writer: &WriterSpec, output: Option, verbose: bool) {
- if verbose {
+fn render_spec(spec: Spec, args: &RenderArgs, writer: &WriterSpec) {
+ if args.verbose {
let metadata = spec.metadata();
eprintln!("\nQuery executed:");
eprintln!(" Rows: {}", metadata.rows);
@@ -397,24 +339,27 @@ fn render_spec(spec: Spec, writer: &WriterSpec, output: Option, verbose
std::process::exit(1);
}
- let render = match writer.name.as_str() {
- "vegalite" => render_vegalite(&spec, &writer.options),
- "png" => render_png(&spec, &writer.options),
- other => {
- eprintln!("Unknown writer '{}'", other);
- eprintln!("Available writers: png, vegalite");
- std::process::exit(1)
- }
- };
+ let info = writer.info;
+ let (render, warnings) = (info.render)(&spec, &writer.options).unwrap_or_else(|e| {
+ eprintln!("Failed to generate {} output: {}", info.label, e);
+ std::process::exit(1);
+ });
+
+ // Unconditionally, not behind -v: something the writer could not express
+ // is a defect in the file the user is about to ship. stderr keeps it out
+ // of a piped artifact.
+ for warning in &warnings {
+ eprintln!("warning: {}", warning);
+ }
- match (render, output) {
+ match (render, &args.output) {
(Output::Text(txt), None) => {
println!("{}", txt);
}
- (Output::Text(txt), Some(path)) => match std::fs::write(&path, txt) {
+ (Output::Text(txt), Some(path)) => match std::fs::write(path, txt) {
Ok(_) => {
- if verbose {
- eprintln!("\nVega-Lite JSON written to: {}", path.display());
+ if args.verbose {
+ eprintln!("\n{} written to: {}", info.label, path.display());
}
}
Err(e) => {
@@ -432,10 +377,10 @@ fn render_spec(spec: Spec, writer: &WriterSpec, output: Option, verbose
});
}
}
- (Output::Bin(buf), Some(path)) => match std::fs::write(&path, buf) {
+ (Output::Bin(buf), Some(path)) => match std::fs::write(path, buf) {
Ok(_) => {
- if verbose {
- eprintln!("\nPNG written to: {}", path.display());
+ if args.verbose {
+ eprintln!("\n{} written to: {}", info.label, path.display());
}
}
Err(e) => {
@@ -510,7 +455,7 @@ fn cmd_validate(query: String, _reader: Option) {
}
// Prints a CSV-like output to stdout with aligned columns
-fn print_table_fallback(query: &str, reader: &R, max_rows: usize) {
+fn print_table_fallback(query: &str, reader: &dyn Reader, max_rows: usize) {
let source_tree = match parser::SourceTree::new(query) {
Ok(st) => st,
Err(e) => {
@@ -790,55 +735,3 @@ fn cmd_skill(format: Option) {
}
}
}
-
-fn render_vegalite(spec: &Spec, options: &WriterOptions) -> Output {
- #[cfg(feature = "vegalite")]
- {
- // Configure from --writer-option, then render
- let vl_writer = unwrap_writer(VegaLiteWriter::from_options(options));
- match vl_writer.render(spec) {
- Ok(json) => Output::Text(json),
- Err(e) => {
- eprintln!("Failed to generate Vega-Lite output: {}", e);
- std::process::exit(1);
- }
- }
- }
- #[cfg(not(feature = "vegalite"))]
- {
- let _ = (spec, options);
- eprintln!("VegaLite writer not compiled in. Rebuild with --features vegalite");
- std::process::exit(1)
- }
-}
-
-fn render_png(spec: &Spec, options: &WriterOptions) -> Output {
- #[cfg(feature = "png")]
- {
- // Configure from --writer-option, then render
- let png_writer = unwrap_writer(PngWriter::from_options(options));
- match png_writer.render(spec) {
- Ok(png) => Output::Bin(png),
- Err(e) => {
- eprintln!("Failed to generate PNG output: {}", e);
- std::process::exit(1);
- }
- }
- }
- #[cfg(not(feature = "png"))]
- {
- let _ = (spec, options);
- eprintln!("PNG writer not compiled in. Rebuild with --features png");
- std::process::exit(1)
- }
-}
-
-/// A writer built from its options, or the option error on stderr and a
-/// non-zero exit — an unusable setting is the user's mistake, not a warning.
-#[cfg(any(feature = "vegalite", feature = "png"))]
-fn unwrap_writer(writer: ggsql::Result) -> W {
- writer.unwrap_or_else(|e| {
- eprintln!("{}", e);
- std::process::exit(1);
- })
-}
diff --git a/ggsql-cli/src/writers.rs b/ggsql-cli/src/writers.rs
new file mode 100644
index 00000000..f3716e02
--- /dev/null
+++ b/ggsql-cli/src/writers.rs
@@ -0,0 +1,512 @@
+/*!
+The writer registry.
+
+Every writer the CLI can drive is one [`WriterInfo`] row in [`WRITERS`]: its
+name, the feature that compiles it, the words used for it in help and verbose
+output, and the function that renders a [`Spec`] with it. Dispatch, the
+`--writer` long help, the `-D` long help and the "unknown writer" message are
+all derived from that one list, so adding a writer means adding a row and its
+render function — nothing else in the CLI changes.
+
+The render functions return their error as a `String` rather than exiting, so
+the caller decides how a failure is reported.
+*/
+
+use ggsql::reader::Spec;
+use ggsql::writer::WriterOptions;
+use std::sync::LazyLock;
+
+// Reached only through a writer's own `check`/`render`, so a build with no
+// writer at all would otherwise carry an unused import.
+#[cfg(feature = "any-writer")]
+use ggsql::writer::Writer;
+
+#[cfg(feature = "vegalite")]
+use ggsql::writer::VegaLiteWriter;
+
+#[cfg(feature = "jpeg")]
+use ggsql::writer::JpegWriter;
+
+#[cfg(feature = "png")]
+use ggsql::writer::PngWriter;
+
+#[cfg(feature = "tiff")]
+use ggsql::writer::TiffWriter;
+
+#[cfg(feature = "hep")]
+use ggsql::writer::HepWriter;
+
+#[cfg(feature = "pdf")]
+use ggsql::writer::PdfWriter;
+
+#[cfg(feature = "svg")]
+use ggsql::writer::SvgWriter;
+
+#[cfg(feature = "webp")]
+use ggsql::writer::WebpWriter;
+
+/// What a writer produced: text to print, or bytes to pipe.
+// Each variant is constructed only by the writers that produce that shape, so
+// a build with none of them compiled in has an unused variant. The gates name
+// exactly those writers; extend them when a writer of that shape is added.
+pub enum Output {
+ #[cfg_attr(not(any(feature = "vegalite", feature = "svg")), allow(dead_code))]
+ Text(String),
+ #[cfg_attr(
+ not(any(
+ feature = "png",
+ feature = "jpeg",
+ feature = "tiff",
+ feature = "webp",
+ feature = "pdf",
+ feature = "hep"
+ )),
+ allow(dead_code)
+ )]
+ Bin(Vec),
+}
+
+/// A render outcome: the output, plus anything the writer had to degrade to
+/// produce it. Most writers report nothing; the vector formats can.
+type Rendered = Result<(Output, Vec), String>;
+
+/// One writer, as the CLI sees it.
+pub struct WriterInfo {
+ /// The name `--writer` takes.
+ pub name: &'static str,
+ /// Alternative spellings accepted for `name`.
+ pub aliases: &'static [&'static str],
+ /// The cargo feature that compiles this writer in.
+ pub feature: &'static str,
+ /// How the format is named in messages: "PNG", "Vega-Lite JSON".
+ pub label: &'static str,
+ /// One line describing the format, for `--writer`'s long help.
+ pub blurb: &'static str,
+ /// The `-D` settings this writer accepts, for `-D`'s long help. The
+ /// writer itself remains the authority — an unknown key is its error.
+ pub options: &'static str,
+ /// Whether this build has the writer's feature enabled.
+ pub compiled: bool,
+ /// Build this writer from `options` and discard it, so a bad setting is
+ /// reported before any SQL runs rather than after.
+ pub check: fn(&WriterOptions) -> Result<(), String>,
+ /// Render a spec with this writer.
+ pub render: fn(&Spec, &WriterOptions) -> Rendered,
+}
+
+/// Build `W` from `options` and throw it away — the whole of what a row's
+/// `check` does once its feature is known to be on.
+#[cfg(feature = "any-writer")]
+fn check_options(options: &WriterOptions) -> Result<(), String> {
+ W::from_options(options)
+ .map(|_| ())
+ .map_err(|e| e.to_string())
+}
+
+pub const WRITERS: &[WriterInfo] = &[
+ WriterInfo {
+ name: "vegalite",
+ aliases: &["vl", "vega-lite"],
+ feature: "vegalite",
+ label: "Vega-Lite JSON",
+ blurb: "Vega-Lite specification as JSON",
+ options: "none",
+ compiled: cfg!(feature = "vegalite"),
+ check: check_vegalite,
+ render: render_vegalite,
+ },
+ WriterInfo {
+ name: "png",
+ aliases: &[],
+ feature: "png",
+ label: "PNG",
+ blurb: "PNG image — lossless, alpha preserved",
+ options: "width, height, units, dpi, background, compression",
+ compiled: cfg!(feature = "png"),
+ check: check_png,
+ render: render_png,
+ },
+ WriterInfo {
+ name: "jpeg",
+ aliases: &["jpg"],
+ feature: "jpeg",
+ label: "JPEG",
+ blurb: "JPEG image — lossy; prefer png or webp for plots",
+ options: "width, height, units, dpi, background, quality",
+ compiled: cfg!(feature = "jpeg"),
+ check: check_jpeg,
+ render: render_jpeg,
+ },
+ WriterInfo {
+ name: "tiff",
+ aliases: &["tif"],
+ feature: "tiff",
+ label: "TIFF",
+ blurb: "TIFF image — lossless, choice of compressor",
+ options: "width, height, units, dpi, background, compression",
+ compiled: cfg!(feature = "tiff"),
+ check: check_tiff,
+ render: render_tiff,
+ },
+ WriterInfo {
+ name: "webp",
+ aliases: &[],
+ feature: "webp",
+ label: "WebP",
+ blurb: "WebP image — lossless, and the smallest of the four",
+ options: "width, height, units, dpi, background",
+ compiled: cfg!(feature = "webp"),
+ check: check_webp,
+ render: render_webp,
+ },
+ WriterInfo {
+ name: "svg",
+ aliases: &[],
+ feature: "svg",
+ label: "SVG",
+ blurb: "SVG vector graphic — scalable, and its text stays text",
+ options: "width, height, units, dpi, background, text, embed-fonts, id-prefix",
+ compiled: cfg!(feature = "svg"),
+ check: check_svg,
+ render: render_svg,
+ },
+ WriterInfo {
+ name: "pdf",
+ aliases: &[],
+ feature: "pdf",
+ label: "PDF",
+ blurb: "PDF page — vector, with the fonts subset in",
+ options: "width, height, units, dpi, background, compress, links",
+ compiled: cfg!(feature = "pdf"),
+ check: check_pdf,
+ render: render_pdf,
+ },
+ WriterInfo {
+ name: "hep",
+ aliases: &[],
+ feature: "hep",
+ label: "plot document",
+ blurb: "Self-contained plot document, for a host that renders it itself",
+ options: "width, height, units, dpi, background, lossy, embed-fonts",
+ compiled: cfg!(feature = "hep"),
+ check: check_hep,
+ render: render_hep,
+ },
+];
+
+/// Closes `--writer`'s long help. The image writers all rasterise through the
+/// GPU, which is a runtime requirement worth stating once rather than in four
+/// blurbs.
+const WRITER_FOOTER: &str = "png, jpeg, tiff and webp rasterise on the GPU and need a working \
+ adapter at render time. svg, pdf and hep do not.";
+
+/// Look up a writer by name or alias, case-insensitively.
+pub fn find(name: &str) -> Option<&'static WriterInfo> {
+ WRITERS.iter().find(|w| {
+ w.name.eq_ignore_ascii_case(name) || w.aliases.iter().any(|a| a.eq_ignore_ascii_case(name))
+ })
+}
+
+/// The message for a `--writer` name that matches no row. Lists every writer,
+/// marking the ones this build does not have — picking a real writer that
+/// isn't compiled in is the more common mistake, and a bare list of compiled
+/// names makes it look like the name was wrong.
+pub fn unknown_writer(name: &str) -> String {
+ let mut msg = format!("Unknown writer '{name}'\nAvailable writers:\n");
+ for info in WRITERS {
+ msg.push_str(&format!(" {:<9} {}", info.name, info.blurb));
+ if !info.compiled {
+ msg.push_str(&format!(" [not compiled in: --features {}]", info.feature));
+ }
+ msg.push('\n');
+ }
+ msg.pop();
+ msg
+}
+
+/// The message for a writer that exists but is not in this build.
+fn not_compiled(label: &str, feature: &str) -> String {
+ format!("The {label} writer is not compiled in. Rebuild with --features {feature}")
+}
+
+/// The same message for a registry row, so the caller can refuse the writer
+/// before running any SQL rather than after.
+pub fn not_compiled_message(info: &WriterInfo) -> String {
+ not_compiled(info.label, info.feature)
+}
+
+static WRITER_HELP: LazyLock = LazyLock::new(|| {
+ let mut help = String::from("Output format. Available writers:");
+ for info in WRITERS {
+ help.push_str(&format!("\n {:<9} {}", info.name, info.blurb));
+ if !info.compiled {
+ help.push_str(&format!(
+ " [not in this build: --features {}]",
+ info.feature
+ ));
+ }
+ }
+ help.push_str("\n\n");
+ help.push_str(WRITER_FOOTER);
+ help
+});
+
+static OPTION_HELP: LazyLock = LazyLock::new(|| {
+ let mut help = String::from(
+ "Settings for the chosen writer, as `key=value`. Repeatable, and one flag \
+ may carry several settings separated by `;` (quote it, as most shells read \
+ `;` themselves): `-D 'width=1600;dpi=150'`.\n\nSettings by writer:",
+ );
+ for info in WRITERS {
+ help.push_str(&format!("\n {:<9} {}", info.name, info.options));
+ }
+ help
+});
+
+/// `--writer`'s long help, listing every writer in the registry.
+pub fn writer_help() -> String {
+ WRITER_HELP.clone()
+}
+
+/// `-D`'s long help, listing each writer's settings.
+pub fn option_help() -> String {
+ OPTION_HELP.clone()
+}
+
+fn check_vegalite(options: &WriterOptions) -> Result<(), String> {
+ #[cfg(feature = "vegalite")]
+ return check_options::(options);
+ #[cfg(not(feature = "vegalite"))]
+ {
+ let _ = options;
+ Ok(())
+ }
+}
+
+fn render_vegalite(spec: &Spec, options: &WriterOptions) -> Rendered {
+ #[cfg(feature = "vegalite")]
+ {
+ let writer = VegaLiteWriter::from_options(options).map_err(|e| e.to_string())?;
+ let json = writer.render(spec).map_err(|e| e.to_string())?;
+ Ok((Output::Text(json), Vec::new()))
+ }
+ #[cfg(not(feature = "vegalite"))]
+ {
+ let _ = (spec, options);
+ Err(not_compiled("Vega-Lite JSON", "vegalite"))
+ }
+}
+
+fn check_png(options: &WriterOptions) -> Result<(), String> {
+ #[cfg(feature = "png")]
+ return check_options::(options);
+ #[cfg(not(feature = "png"))]
+ {
+ let _ = options;
+ Ok(())
+ }
+}
+
+fn render_png(spec: &Spec, options: &WriterOptions) -> Rendered {
+ #[cfg(feature = "png")]
+ {
+ let writer = PngWriter::from_options(options).map_err(|e| e.to_string())?;
+ let png = writer.render(spec).map_err(|e| e.to_string())?;
+ Ok((Output::Bin(png), Vec::new()))
+ }
+ #[cfg(not(feature = "png"))]
+ {
+ let _ = (spec, options);
+ Err(not_compiled("PNG", "png"))
+ }
+}
+
+fn check_jpeg(options: &WriterOptions) -> Result<(), String> {
+ #[cfg(feature = "jpeg")]
+ return check_options::(options);
+ #[cfg(not(feature = "jpeg"))]
+ {
+ let _ = options;
+ Ok(())
+ }
+}
+
+fn render_jpeg(spec: &Spec, options: &WriterOptions) -> Rendered {
+ #[cfg(feature = "jpeg")]
+ {
+ let writer = JpegWriter::from_options(options).map_err(|e| e.to_string())?;
+ let jpeg = writer.render(spec).map_err(|e| e.to_string())?;
+ Ok((Output::Bin(jpeg), Vec::new()))
+ }
+ #[cfg(not(feature = "jpeg"))]
+ {
+ let _ = (spec, options);
+ Err(not_compiled("JPEG", "jpeg"))
+ }
+}
+
+fn check_tiff(options: &WriterOptions) -> Result<(), String> {
+ #[cfg(feature = "tiff")]
+ return check_options::(options);
+ #[cfg(not(feature = "tiff"))]
+ {
+ let _ = options;
+ Ok(())
+ }
+}
+
+fn render_tiff(spec: &Spec, options: &WriterOptions) -> Rendered {
+ #[cfg(feature = "tiff")]
+ {
+ let writer = TiffWriter::from_options(options).map_err(|e| e.to_string())?;
+ let tiff = writer.render(spec).map_err(|e| e.to_string())?;
+ Ok((Output::Bin(tiff), Vec::new()))
+ }
+ #[cfg(not(feature = "tiff"))]
+ {
+ let _ = (spec, options);
+ Err(not_compiled("TIFF", "tiff"))
+ }
+}
+
+fn check_webp(options: &WriterOptions) -> Result<(), String> {
+ #[cfg(feature = "webp")]
+ return check_options::(options);
+ #[cfg(not(feature = "webp"))]
+ {
+ let _ = options;
+ Ok(())
+ }
+}
+
+fn render_webp(spec: &Spec, options: &WriterOptions) -> Rendered {
+ #[cfg(feature = "webp")]
+ {
+ let writer = WebpWriter::from_options(options).map_err(|e| e.to_string())?;
+ let webp = writer.render(spec).map_err(|e| e.to_string())?;
+ Ok((Output::Bin(webp), Vec::new()))
+ }
+ #[cfg(not(feature = "webp"))]
+ {
+ let _ = (spec, options);
+ Err(not_compiled("WebP", "webp"))
+ }
+}
+
+fn check_svg(options: &WriterOptions) -> Result<(), String> {
+ #[cfg(feature = "svg")]
+ return check_options::(options);
+ #[cfg(not(feature = "svg"))]
+ {
+ let _ = options;
+ Ok(())
+ }
+}
+
+fn render_svg(spec: &Spec, options: &WriterOptions) -> Rendered {
+ #[cfg(feature = "svg")]
+ {
+ let writer = SvgWriter::from_options(options).map_err(|e| e.to_string())?;
+ let (svg, warnings) = writer.render_reporting(spec).map_err(|e| e.to_string())?;
+ Ok((Output::Text(svg), warnings))
+ }
+ #[cfg(not(feature = "svg"))]
+ {
+ let _ = (spec, options);
+ Err(not_compiled("SVG", "svg"))
+ }
+}
+
+fn check_pdf(options: &WriterOptions) -> Result<(), String> {
+ #[cfg(feature = "pdf")]
+ return check_options::(options);
+ #[cfg(not(feature = "pdf"))]
+ {
+ let _ = options;
+ Ok(())
+ }
+}
+
+fn render_pdf(spec: &Spec, options: &WriterOptions) -> Rendered {
+ #[cfg(feature = "pdf")]
+ {
+ let writer = PdfWriter::from_options(options).map_err(|e| e.to_string())?;
+ let (pdf, warnings) = writer.render_reporting(spec).map_err(|e| e.to_string())?;
+ Ok((Output::Bin(pdf), warnings))
+ }
+ #[cfg(not(feature = "pdf"))]
+ {
+ let _ = (spec, options);
+ Err(not_compiled("PDF", "pdf"))
+ }
+}
+
+fn check_hep(options: &WriterOptions) -> Result<(), String> {
+ #[cfg(feature = "hep")]
+ return check_options::(options);
+ #[cfg(not(feature = "hep"))]
+ {
+ let _ = options;
+ Ok(())
+ }
+}
+
+fn render_hep(spec: &Spec, options: &WriterOptions) -> Rendered {
+ #[cfg(feature = "hep")]
+ {
+ let writer = HepWriter::from_options(options).map_err(|e| e.to_string())?;
+ let (bytes, warnings) = writer.render_reporting(spec).map_err(|e| e.to_string())?;
+ Ok((Output::Bin(bytes), warnings))
+ }
+ #[cfg(not(feature = "hep"))]
+ {
+ let _ = (spec, options);
+ Err(not_compiled("plot document", "hep"))
+ }
+}
+
+#[cfg(test)]
+mod tests {
+ use super::*;
+
+ #[test]
+ fn every_writer_is_findable_by_name_and_alias() {
+ for info in WRITERS {
+ assert_eq!(find(info.name).map(|w| w.name), Some(info.name));
+ for alias in info.aliases {
+ assert_eq!(find(alias).map(|w| w.name), Some(info.name));
+ }
+ }
+ }
+
+ #[test]
+ fn lookup_ignores_case() {
+ assert_eq!(find("PNG").map(|w| w.name), Some("png"));
+ assert!(find("furlongs").is_none());
+ }
+
+ #[test]
+ fn names_and_aliases_are_unique() {
+ let mut seen = Vec::new();
+ for info in WRITERS {
+ seen.push(info.name);
+ seen.extend(info.aliases);
+ }
+ let mut sorted = seen.clone();
+ sorted.sort_unstable();
+ sorted.dedup();
+ assert_eq!(sorted.len(), seen.len(), "duplicate writer name or alias");
+ }
+
+ #[test]
+ fn help_mentions_every_writer() {
+ let writer_help = writer_help();
+ let option_help = option_help();
+ let unknown = unknown_writer("nope");
+ for info in WRITERS {
+ assert!(writer_help.contains(info.name), "{} missing", info.name);
+ assert!(option_help.contains(info.name), "{} missing", info.name);
+ assert!(unknown.contains(info.name), "{} missing", info.name);
+ }
+ }
+}
diff --git a/src/CLAUDE.md b/src/CLAUDE.md
index 9082c55f..92e6a0be 100644
--- a/src/CLAUDE.md
+++ b/src/CLAUDE.md
@@ -65,12 +65,20 @@ The pipeline that takes a parsed `Plot` plus a `Reader` and produces a fully-res
### `writer/`
-`Writer` trait in `mod.rs` (associated `Output` type so writers can return text or bytes, and `from_options` for configuration a frontend collects as key–value pairs — `options.rs`'s `WriterOptions`, parsed from the CLI's `--writer-option`). Two implementations:
+`Writer` trait in `mod.rs` (associated `Output` type so writers can return text or bytes, and `from_options` for configuration a frontend collects as key–value pairs — `options.rs`'s `WriterOptions`, parsed from the CLI's `--writer-option`). Two families:
- **Vega-Lite** (`vegalite` feature, default) — emits Vega-Lite JSON. Deep-dive: [`writer/vegalite/CLAUDE.md`](writer/vegalite/CLAUDE.md).
-- **PNG** (`png` feature, non-default) — `PngWriter` renders PNG bytes via a GPU (wgpu/vello) backend. The module implementing it is `writer/hephaestus/`, after the renderer it wraps; that name is internal, and the module is private so only `PngWriter` is public. Deep-dive (architecture + known gaps): [`writer/hephaestus/CLAUDE.md`](writer/hephaestus/CLAUDE.md). Excluded from the MSRV 1.86 build (hephaestus needs 1.88) and needs a GPU adapter at render time.
+- **The renderer-backed writers** (seven of them, none default) — all live in `writer/hephaestus/`, named after the renderer they wrap; that name is internal, and the module is private so only the writers, `Canvas` and `RasterRenderer` are public. They share their whole pipeline — `Canvas` for configuration, `compose` for the plot composition, then either `raster` for pixels or `vector` for drawing commands — and differ only in what they do with the result. Deep-dive (architecture + known gaps): [`writer/hephaestus/CLAUDE.md`](writer/hephaestus/CLAUDE.md).
-`ggplot2` and `plotters` are reserved feature flags with no implementation.
+ | Feature | Writer | Output | GPU |
+ | --- | --- | --- | --- |
+ | `png` / `jpeg` / `tiff` / `webp` | `PngWriter`, `JpegWriter`, `TiffWriter`, `WebpWriter` | image bytes | required |
+ | `svg` / `pdf` | `SvgWriter`, `PdfWriter` | vector text / one PDF page | **none** |
+ | `hep` | `HepWriter` | a `.hep` plot document — no picture | **none** |
+
+ The last three go through the same composition and the same `render` call (which takes `&mut dyn SceneBuilder`), so they need no adapter, pull in no wgpu, and **compile on the MSRV 1.86 toolchain** — `cargo +1.86 check --features svg,pdf,hep --ignore-rust-version`, where the flag is needed only because `parley` *declares* 1.88 while compiling fine on 1.86. Only the raster writers are genuinely 1.88+.
+
+Two **internal** features carry the split, enabled by the writer features rather than named directly: `graphics` is the shared composition layer, and `raster = graphics + hephaestus/vello` adds the GPU rasteriser. Only `raster` pulls in wgpu, vello and pollster, which is what lets a vector-only build skip them — `cargo tree --features graphics` shows none of the three, `--features png` shows 18. `graphics` is also the single module gate for `writer/hephaestus/`, so adding a format needs no change there.
### `plot/`
@@ -103,9 +111,19 @@ Defined in `Cargo.toml`:
| `parquet` | ✓ | Parquet support in readers/data |
| `spatial` | ✓ | Spatial/geometry support (geozero for WKT↔GeoJSON) |
| `vegalite` | ✓ | Vega-Lite writer |
-| `png` | — | PNG raster writer (GPU; excluded from the MSRV build) |
+| `graphics` | — | *Internal.* The shared plot-composition layer; no GPU |
+| `raster` | — | *Internal.* `graphics` + the GPU rasteriser (wgpu/vello) |
+| `png` | — | PNG writer (`raster`; excluded from the MSRV build) |
+| `jpeg` | — | JPEG writer (`raster`) |
+| `tiff` | — | TIFF writer (`raster`) |
+| `webp` | — | WebP writer (`raster`) |
+| `svg` | — | SVG writer (`graphics`; no GPU, MSRV-clean) |
+| `pdf` | — | PDF writer (`graphics`; no GPU, MSRV-clean) |
+| `hep` | — | `.hep` plot-document writer (`graphics`; no GPU, MSRV-clean) |
+| `hep-read` | — | **Test-only.** Reading a `.hep` back, for the round-trip test |
| `builtin-data` | ✓ | Bundled penguins/airquality datasets |
| `all-readers` | — | `duckdb` + `sqlite` + `odbc` |
+| `all-writers` | — | every writer above except the test-only `hep-read` |
`ggsql-wasm` builds with `default-features = false` plus `vegalite`, `sqlite`, `builtin-data`. `ggsql-jupyter` builds with `duckdb`, `vegalite`.
diff --git a/src/Cargo.toml b/src/Cargo.toml
index 2c6734a9..6075d414 100644
--- a/src/Cargo.toml
+++ b/src/Cargo.toml
@@ -83,6 +83,28 @@ vegalite = []
graphics = ["dep:hephaestus"]
raster = ["graphics", "hephaestus/vello"]
+# One feature per output format, each pulling in exactly one codec. The knob
+# each writer exposes is the axis its format actually has — png trades encode
+# time for size, jpeg trades quality for size, tiff picks a compressor, and
+# webp is lossless with no rate control at all — so they share no setting they
+# would each have to reinterpret.
png = ["raster", "hephaestus/png"]
+jpeg = ["raster", "hephaestus/jpeg"]
+tiff = ["raster", "hephaestus/tiff"]
+webp = ["raster", "hephaestus/webp"]
+
+# The vector writers need only `graphics`: they record the composition's own
+# drawing commands rather than rasterising them, so they pull in no wgpu, need
+# no GPU adapter at render time, and compile on the MSRV toolchain.
+svg = ["graphics", "hephaestus/svg"]
+pdf = ["graphics", "hephaestus/pdf"]
+
+# The plot-document writer. Named after the format, which ggsql does not own —
+# see `src/writer/hephaestus/CLAUDE.md` on why that is accurate rather than a
+# leak. `hep-read` is test-only: it is what lets the round trip be asserted.
+hep = ["graphics", "hephaestus/document-write"]
+hep-read = ["hep", "hephaestus/document-read"]
+
builtin-data = []
all-readers = ["duckdb", "sqlite", "odbc"]
+all-writers = ["vegalite", "png", "jpeg", "tiff", "webp", "svg", "pdf", "hep"]
diff --git a/src/writer/hephaestus/CLAUDE.md b/src/writer/hephaestus/CLAUDE.md
index 3360d571..7d339711 100644
--- a/src/writer/hephaestus/CLAUDE.md
+++ b/src/writer/hephaestus/CLAUDE.md
@@ -1,15 +1,48 @@
-# `writer/hephaestus/` — PNG writer internals
+# `writer/hephaestus/` — renderer-backed writer internals
-`PngWriter` renders a resolved ggsql `Spec` to **PNG bytes** via
+The writers here render a resolved ggsql `Spec` through
[hephaestus](https://github.com/posit-dev/hephaestus), a 2D scene renderer with a
-grammar-of-graphics plot API. Behind the non-default `png` cargo feature.
-
-**hephaestus is not a public name.** The user-facing writer is `png`
-(`--writer png`, `--features png`, `ggsql::writer::PngWriter`); the module is
-named after the renderer it wraps and is private, so nothing but `PngWriter`,
-`Color` and `rgba` leaves the crate. More hephaestus-backed writers (svg, pdf,
-window) are expected, each with its own public name. Keep the renderer's name out
-of anything a user reads — CLI help, error messages, `/doc/`.
+grammar-of-graphics plot API. Seven of them exist, each behind its own
+non-default cargo feature:
+
+| Writer | Feature | GPU | Output | Its own options |
+| --- | --- | --- | --- | --- |
+| `PngWriter` | `png` | yes | PNG bytes, lossless, alpha preserved | `compression` = `none`/`fast`/`balanced`/`small` |
+| `JpegWriter` | `jpeg` | yes | JPEG bytes, lossy, **no alpha** | `quality` 1–100 |
+| `TiffWriter` | `tiff` | yes | TIFF bytes, lossless, alpha preserved | `compression` = `none`/`deflate`/`lzw`/`packbits` |
+| `WebpWriter` | `webp` | yes | WebP bytes, lossless VP8L, alpha preserved | — |
+| `SvgWriter` | `svg` | **no** | SVG text, resolution independent | `text` = `text`/`outline`, `embed-fonts`, `id-prefix` |
+| `PdfWriter` | `pdf` | **no** | one PDF page, fonts subset in | `compress`, `links` |
+| `HepWriter` | `hep` | **no** | a `.hep` plot document — no picture at all | `lossy`, `embed-fonts` |
+
+**Each format exposes the axis it actually has, and they share no knob they
+would have to reinterpret.** PNG's `compression` trades encode time for size,
+TIFF's trades reader compatibility for size (all four of its compressors are
+lossless, so `deflate` simply *is* the small one), JPEG's `quality` is a rate
+knob, and VP8L has no rate control at all. A shared `compression` across the
+four raster writers would mean four different things.
+
+**The three GPU-free writers are the important ones architecturally.** They go
+through the same `PlotComposition` and the same `render` call — the composition
+takes `&mut dyn SceneBuilder`, so a vector scene slots in exactly where the
+rasteriser does. That is why they need no adapter, pull in no wgpu, and compile
+on the MSRV toolchain, which is what keeps them available to the R bindings. It
+is also what makes them the test surface: see [Testing](#testing).
+
+**hephaestus is not a public name.** The user-facing names are the formats
+(`--writer png`, `--features webp`, `ggsql::writer::TiffWriter`); the module is
+named after the renderer it wraps and is private, so nothing but the writers,
+`Canvas`, `RasterRenderer`, `Color` and `rgba` leaves the crate. More
+hephaestus-backed writers (svg, pdf, window) are expected, each with its own
+public name. Keep the renderer's name out of anything a user reads — CLI help,
+error messages, `/doc/`.
+
+The one carve-out: **a foreign format may be called by its own name.**
+`HepWriter` writes hephaestus's own `.hep` plot-document format, whose magic
+bytes are `HEPHPLOT`. ggsql does not define that format, so naming it after its
+owner is accurate rather than a leak — and "document" would have been the worse
+name, implying a generic container ggsql defines. ggsql's *own* writers still
+may not be named after the renderer.
This file is the **architecture**: the abstractions, the invariants, and how to
extend them. For how the writer's behaviour got here, read
@@ -40,15 +73,25 @@ debt that would disappear if ggsql resolved more:
| Exception | Where | Why |
| --- | --- | --- |
| Free facet dimensions | `scales::{free_position_scale, free_binned_scale}` | ggsql resolves one global domain; a `free` panel needs its own. Only the *extent* is computed — the padding around it is still ggsql's, via `Scale::expand_range`. |
-| Spatial `pos1`/`pos2` | `mod.rs::map_bbox` | A spatial layer positions by geometry, so ggsql resolves no position scales. The bbox still comes from ggsql (`Projection.computed["bbox"]`), falling back to the geometry extent only for a bare `spatial` geom. |
+| Spatial `pos1`/`pos2` | `compose.rs::map_bbox` | A spatial layer positions by geometry, so ggsql resolves no position scales. The bbox still comes from ggsql (`Projection.computed["bbox"]`), falling back to the geometry extent only for a bare `spatial` geom. |
## Configuration
-Raster output needs concrete dimensions, so unlike the Vega-Lite writer this one
-carries state: `width`, `height` (both pixels), `dpi`, and `background`.
-`PngWriter::new` + `.background()` set them directly;
-`Writer::from_options` builds the same thing from the frontend-agnostic
-key–value [`WriterOptions`](../options.rs) (`-D width=1600` on the CLI). The user-facing table of keys lives in the struct's rustdoc and in
+Rendering needs concrete dimensions, so unlike the Vega-Lite writer these
+carry state — and they carry the *same* state, in [`canvas.rs`](canvas.rs):
+`Canvas { width, height, dpi, background, physical }`. Each writer's `new` +
+`.background()` set it directly; `Writer::from_options` builds the same thing
+from the frontend-agnostic key–value [`WriterOptions`](../options.rs)
+(`-D width=1600` on the CLI), via `Canvas::from_options(options, extra)` where
+`extra` is the writer's own keys.
+
+`CANVAS_OPTIONS` leads the concatenation `reject_unknown` sees, so the shared
+keys come first in the "supported options" list — the nearest miss for a
+mistyped key is almost always one of them. `physical` records that `units`
+resolved to a physical unit; only a vector backend consults it, to decide
+whether to declare a print size.
+
+The user-facing table of keys lives in each writer's rustdoc and in
[`/doc/get_started/tooling/cli.qmd`](../../../doc/get_started/tooling/cli.qmd);
what matters here:
@@ -70,7 +113,7 @@ runtime do layout and scale application, hephaestus **is** the runtime. So
`write` builds a live object graph and renders it.
```
-PngWriter::write(&Plot, &HashMap)
+compose::build_composition(&Plot, &HashMap)
│
├─ facet::build_panels(spec, data) → (Composition, Vec)
│ 1×1 grid + one Panel when unfaceted; else grid(nrow, ncol, cells)
@@ -93,17 +136,49 @@ PngWriter::write(&Plot, &HashMap)
│ └─ view.attach_plot(plot)
│
├─ legend_sink (captured from the *first* panel) → view.add_legend(..)
- ├─ view.validate()
- └─ render_png: VelloRenderer → RGBA8 buffer → hephaestus::png::encode_png
+ └─ view.validate()
+
+raster::pixels(spec, data, canvas, renderer)
+ ├─ compose::validate_plot ← rejects a zero-layer plot, and
+ │ the `arrow` stub no writer draws
+ ├─ compose::build_composition ← the diagram above
+ └─ raster::render_rgba8: VelloRenderer → straight-alpha RGBA8 buffer
+
+::write_with = raster::pixels, then one encoder call
+::write_reporting = vector::draw into an SvgScene / PdfScene, then encode
+HepWriter::write_reporting = write_composition — no scene, no pixels
```
+A writer is therefore its option parsing plus one line. `PlotComposition` is
+where the work is, and it is format-independent — which is why the module gate
+is the internal `graphics` feature and only `raster` pulls in wgpu.
+
+**Degradation is reported, not returned.** `SvgScene` and `PdfScene` collect
+what the format could not express, and the `hep` writer can list what the
+document cannot carry. `Writer::write` has nowhere to put that, and widening
+the trait for three of eight writers would be wrong, so those three add an
+inherent `write_reporting` / `render_reporting` returning `(output, Vec)`
+and `Writer::write` discards the second half. `Vec` rather than a ggsql
+enum: the renderer's variants are `#[non_exhaustive]`, so mirroring them means
+re-deriving a growing list every release and re-exporting them leaks its type
+names — each writer's `describe()` translates at the boundary instead, which is
+also where the renderer's name gets scrubbed. The list should be empty for
+everything ggsql draws, and the corpus tests assert exactly that.
+
Layers draw in `spec.layers` order, which is DRAW order, which is z-order.
## Module map
| File | Role |
| --- | --- |
-| [`mod.rs`](mod.rs) | `PngWriter` (size / dpi / background), `Writer` impl including `from_options`, the orchestration above, `map_bbox`, `render_png`, and the writer's test suite. |
+| [`mod.rs`](mod.rs) | Module wiring and the public re-exports, plus the shared `renders_*` corpus driven through the PNG writer. No writer lives here. |
+| [`canvas.rs`](canvas.rs) | `Canvas`, `CANVAS_OPTIONS`, unit conversion and the dimension bound — the configuration every writer shares. Plus the test-only `Canvased` / `assert_canvas_semantics`, so the shared option behaviour is asserted once per writer rather than restated per writer. |
+| [`compose.rs`](compose.rs) | `validate_plot` and `build_composition` — the orchestration above, and `map_bbox` / `map_range`. Format-independent, and where nearly all the code is. |
+| [`raster.rs`](raster.rs) | `RasterRenderer`, `render_rgba8`, and `pixels`. **The only file that names a GPU renderer**, and the only part needing an adapter. |
+| [`vector.rs`](vector.rs) | `draw` — the same three steps as `raster::pixels`, into a `&mut dyn SceneBuilder` instead of a pixel buffer. No GPU. |
+| [`png.rs`](png.rs), [`jpeg.rs`](jpeg.rs), [`tiff.rs`](tiff.rs), [`webp.rs`](webp.rs) | One raster writer each: its rustdoc option table, `from_options`, and one encoder call. |
+| [`svg.rs`](svg.rs), [`pdf.rs`](pdf.rs) | One vector writer each, plus a `describe()` translating what the format could not express into ggsql's vocabulary. |
+| [`hep.rs`](hep.rs) | The plot-document writer. Serialises the composition; builds no scene at all. |
| [`wiring.rs`](wiring.rs) | The shared, geom-generic machinery: `Ctx`, `GeomSpec` + its parts, `build_and_add`, `wire_positions`, `wire_material`, `MaterialSource`/`resolve_material`, `BandAxes`, `side`/band helpers, `material_legend`, label resolution. |
| [`scales.rs`](scales.rs) | ggsql `Scale` → hephaestus `Scale`. `RangeKind`, transform + palette + break mapping, temporal scales, free-panel scales, `binned_bins`/`bin_at_centre`. |
| [`channels.rs`](channels.rs) | DataFrame column → typed channel data (`ChannelData`, `column_to_*`), group keys, WKB/WKT geometry decoding. |
@@ -436,24 +511,79 @@ a channel belongs there.
## Testing
-Tests live at the bottom of [`mod.rs`](mod.rs):
+The shared corpus lives at the bottom of [`mod.rs`](mod.rs); each writer's own
+option tests live beside it in its own file:
```sh
-cargo test --features png --lib writer::hephaestus
+# Everything. `hep-read` is test-only and unlocks the round trip.
+cargo test --features all-writers,hep-read --lib writer::hephaestus
+
+# The GPU-free subset — hard assertions, and what CI can rely on.
+cargo test --features svg,pdf,hep,hep-read --lib writer::hephaestus
```
-Two kinds, plus a third that doesn't exist yet:
+**Option tests do not repeat themselves.** `canvas::assert_canvas_semantics::()`
+covers the five shared keys — defaults, unit conversion, the `MAX_DIMENSION`
+bound, the background spellings, and that a bad value names its own option — and
+is called once per writer, which is what catches a writer that parses a canvas
+key itself or forgets to pass its own keys through. Transparency is separate
+(`assert_transparent_background`), because JPEG has no alpha channel and refuses
+it. A writer's own file then tests only the keys its format adds.
+
+### The corpus runs through every writer
+
+`assert_renders(query)` drives **each compiled writer** over one query, so a
+corpus entry is written once and checked by all of them. The ~78 `renders_*`
+tests are that corpus: one query per geom, facet mode, scale kind, position
+adjustment and projection.
+
+**The vector assertions are what makes this a regression net.** They need no
+adapter, so they run in CI and on a headless box: `` opened and closed,
+a non-zero `` count, `%PDF-` and `%%EOF`, and — the real one —
+**`warnings()` empty**, meaning nothing in the whole corpus reached a case a
+vector format cannot express. The raster assertion still skips where there is
+no adapter (`assert_png_or_skip` matches on the substring `"GPU renderer"`), so
+a green run has never proved a *raster* render happened. Before the vector
+writers existed, that was the only kind of end-to-end assertion there was.
+
+### The assertions only readable output can make
+
+`mod svg_text` checks the [governing principle](#the-governing-principle)
+*directly*, which no raster test can: SVG output is text, so the breaks, labels
+and titles ggsql resolved can be read back out of it.
+
+- Tick labels appear verbatim, in ggsql's own number formatting.
+- Facet strip labels appear **once each, in panel order** — previously asserted
+ only against `build_panels`, never against rendered output.
+- `RENAMING` reaches both an axis rail and a legend key.
+- A binned scale's resolved edges reach the colorbar.
+- Every `LABEL` slot appears, and markdown is **parsed** — no literal `*`, and
+ the emphasised run carries a style.
+- `text=outline` → zero `` and more ``; `id-prefix` rewrites every
+ id *and* every `url(#…)` reference.
+- `units=in` → a `pt` root over a pixel `viewBox`, so the file prints at the
+ size it was asked for.
+
+`mod pdf_structure` does the same for what PDF's structure exposes: the
+`/MediaBox` at 72 pt per inch, `compress=false` leaving no `/FlateDecode`, and
+`/FontFile2` proving the fonts are subset in.
+
+`mod hep_roundtrip` (behind the test-only `hep-read` feature) is the strongest
+single test here: write a document, read it back into a **new** composition,
+render both to SVG and compare **byte for byte**. Any loss anywhere in the
+format — a scale, a break, a theme entry, a channel column, a geom — shows up as
+different drawing commands. SVG is the comparison surface precisely because it
+is deterministic text; a raster comparison would be at the mercy of GPU
+antialiasing, which is not bit-reproducible even between two runs of the same
+code.
+
+### Still eyeballing
-- **`renders_*` smoke tests** — render succeeds and the output carries the PNG
- signature. `assert_png_or_skip` tolerates a headless machine with no GPU
- adapter (it skips rather than fails), so a green run does not prove a render
- happened locally.
- **Exact-text assertions** — `facet_strips_*` and the `binned_bins` /
- `bin_at_centre` / temporal-scale unit tests need no GPU and are the real
- regression net.
-- **Snapshot PNG tests do not exist.** Visual correctness is
- verified by eyeballing, usually against the Vega-Lite render of the same
- query. Assume a hephaestus version bump needs re-eyeballing:
+ `bin_at_centre` / temporal-scale unit tests need no GPU either.
+- **Snapshot tests do not exist.** Whole-picture correctness is still verified
+ by eye, usually against the Vega-Lite render of the same query. Assume a
+ hephaestus version bump needs re-eyeballing:
```sh
cargo run -p ggsql-cli --features png -- exec "" \
@@ -478,22 +608,34 @@ so one run inventories every gap at once. Implementation notes:
## Operational constraints
-- **A GPU adapter is required at render time.** Vello/wgpu is hephaestus's only
- working backend. CI installs Mesa's lavapipe; headless containers need
- something equivalent.
-- **fontconfig is a build-time dependency on Linux.** Text layout goes through
- parley/fontique, which links the system fontconfig to enumerate fonts, so
- `libfontconfig1-dev` (or the distro equivalent supplying `fontconfig.pc`) must
- be installed before building with `--features png`. macOS uses CoreText and
- needs nothing extra.
-- **Raster only.** No SVG/PDF — hephaestus's other backends are declared
- placeholders.
-- **MSRV split.** hephaestus needs rustc ≥1.88; ggsql's MSRV is CRAN-locked at
- 1.86. The feature is therefore non-default and excluded from the MSRV job (CI
- runs the png steps with `cargo +stable`), which also means this writer
- is not viable for the R/CRAN target and is not the wasm default. Always check a
- change still builds under `cargo +1.86 build` *without* the feature.
-- **The dependency is the published `0.1.0` crate** (`src/Cargo.toml`), so
+- **A GPU adapter is required by the four raster writers**, at render time.
+ Vello/wgpu is hephaestus's only rasterising backend. CI installs Mesa's
+ lavapipe; headless containers need something equivalent. The vector and
+ document writers need neither an adapter nor wgpu.
+- **fontconfig is a build-time dependency on Linux**, for **every**
+ hephaestus-backed feature and not just the raster ones: text layout goes
+ through parley/fontique, which links the system fontconfig to enumerate fonts
+ regardless of which backend draws. So `libfontconfig1-dev` (or the distro
+ equivalent supplying `fontconfig.pc`) is needed to build with `svg` just as
+ much as with `png`. macOS uses CoreText and needs nothing extra.
+- **A GPU is needed for raster output, not to see a plot.** `svg`, `pdf` and
+ `hep` need no adapter and no wgpu, so they are the fallback for a machine
+ that has none — and the reason CI has hard assertions at all.
+- **MSRV split, and it is narrower than it looks.** ggsql's MSRV is CRAN-locked
+ at 1.86, and only the builds that pull `vello` are genuinely 1.88+. The vector
+ and document writers **compile on 1.86** — what refuses is cargo's *floor
+ check*, because `parley` declares `rust-version = 1.88` while compiling fine
+ on 1.86, and `--ignore-rust-version` bypasses a declaration check:
+
+ ```sh
+ cargo +1.86 check -p ggsql --features svg,pdf,hep --ignore-rust-version # passes
+ ```
+
+ hephaestus keeps a CI job asserting this stays true. So `svg`/`pdf`/`hep`
+ remain viable for the R/CRAN target; `png`/`jpeg`/`tiff`/`webp` do not, and
+ CI runs their steps with `cargo +stable`.
+- **The dependency is the published `0.4.0` crate** (`src/Cargo.toml`), pinned
+ with `default-features = false` so `vello` arrives only with `raster`. So
nothing here blocks publishing ggsql. hephaestus's own semver contract extends
to the `kurbo`, `peniko` and `wgpu` types in its public API, so a bump in any
of those is a breaking change to this writer even when hephaestus's own API
@@ -503,33 +645,29 @@ so one run inventories every gap at once. Implementation notes:
Deliberately not done, in rough order of how likely they are to bite:
-- **No snapshot PNG tests** (see [Testing](#testing)) — visual correctness is
- checked by eyeballing, with the harness for doing it at scale.
+- **No snapshot tests** (see [Testing](#testing)) — whole-picture correctness is
+ checked by eyeballing, with the harness for doing it at scale. The SVG corpus
+ is the natural fixture surface, being deterministic text where a 2 px panel
+ shift reads as a hunk rather than as a changed hash.
+- **A `.hep` document of a plot under a non-Cartesian projection cannot be read
+ back.** Writing works; reading panics, because the renderer's decoder calls
+ `add_axis` before restoring the projection, so a polar axis is validated
+ against the default Cartesian. Upstream, and fixable without a wire change.
+ Recorded as an ignored test (`hep_roundtrip::a_polar_document_rebuilds_too`)
+ so it turns green on its own.
+- **Log-scale tick labels are wrong, and not because of this writer.** ggsql
+ resolves a 1–100 `log10` domain to breaks of
+ `[5e-308, 2e-256, …, 100]`, and both writers faithfully print those. The fix
+ is in scale resolution; nothing changes here. Recorded as an ignored test
+ (`svg_text::log_tick_labels_should_be_decades`).
- **No axis label thinning.** ggsql's resolved breaks are drawn as-is, so a
narrow facet panel can crowd or overlap long labels — which is why
`free_continuous_scale` narrows the *global* breaks to a panel rather than
letting hephaestus invent per-panel ones.
-- **Legend titles and break labels don't parse markdown.** [`ggsql_theme`](wiring.rs)
- sets `markdown` on the root text element, so the flag cascades to every slot —
- but hephaestus only consults it where a slot goes through
- `chrome::text::measure_for_element` / `draw_text_element_in_rect` (plot title,
- subtitle, caption, axis titles, strip labels). Legend titles
- (`chrome/legend/mod.rs`, `chrome/legend/colorbar.rs`), legend key labels
- (`chrome/legend/measure.rs`, `chrome/legend/render_keys.rs`) and tick labels
- (`chrome/axis.rs`, `chrome/linear_axis.rs`, `chrome/polar.rs`) build a
- `TextRun::new` directly and draw their markers literally. **Fixing this is
- upstream work**; nothing changes in this writer when it lands.
- **No switch on rich-text chrome.** [`ggsql_theme`](wiring.rs) turns markdown on
for the whole chrome cascade, so a title that wants a literal `*` has no way to
ask for one. The text layer has `parse`; chrome waits for ggsql to grow a theme
concept, which is where the same switch belongs.
-- **Rich text costs ~1pt of layout.** A plain string measures slightly larger
- through the rich shaper than through the plain one, so every axis title claims a
- little more room and the panel comes out a few px smaller than it did before
- markdown was on. Aligning the sheet's line height with the theme's (see
- `ggsql_theme`) removed the bulk of it; the ~1pt that remains is the rich block
- model's own box, which no sheet entry reaches. Visually imperceptible, but it is
- why a residual diff over the harness shows nearly every cell as "changed".
## See also
diff --git a/src/writer/hephaestus/canvas.rs b/src/writer/hephaestus/canvas.rs
index dc0b1acb..bb42c9c8 100644
--- a/src/writer/hephaestus/canvas.rs
+++ b/src/writer/hephaestus/canvas.rs
@@ -32,6 +32,13 @@ const MAX_DIMENSION: f64 = 32_768.0;
/// the shared ones lead the "supported options" list in the error.
pub const CANVAS_OPTIONS: &[&str] = &["width", "height", "units", "dpi", "background"];
+/// The canvas keys that describe a *size* rather than an appearance.
+///
+/// A writer whose canvas is only a hint needs to tell "no size was asked for"
+/// apart from "a size was asked for that happens to equal the default", and
+/// these are the keys that decide it.
+pub const CANVAS_HINT_OPTIONS: &[&str] = &["width", "height", "units", "dpi"];
+
/// Units a `width` / `height` option may be given in.
const UNITS: &[&str] = &["px", "in", "cm", "mm", "pt"];
@@ -134,6 +141,22 @@ impl Canvas {
pub fn dpi_hint(&self) -> Option {
Some(self.dpi)
}
+
+ /// The background as a vector backend wants it: `None` when fully
+ /// transparent.
+ ///
+ /// A rasteriser is always handed a colour to clear with, even a transparent
+ /// one. A vector backend instead takes `None` to mean *emit no background
+ /// element at all*, which is what a transparent canvas should become — a
+ /// full-canvas rect painted in transparent black is a real element that
+ /// some consumers still composite, and it is dead weight in every other.
+ pub fn vector_background(&self) -> Option {
+ if self.background.components[3] <= 0.0 {
+ None
+ } else {
+ Some(self.background)
+ }
+ }
}
impl Default for Canvas {
@@ -167,3 +190,108 @@ fn whole_pixels(pixels: f64, key: &str) -> Result {
}
Ok(rounded as u32)
}
+
+/// Test-only access to a writer's canvas.
+///
+/// Implemented by every renderer-backed writer so the shared option behaviour
+/// can be asserted generically instead of once per format.
+#[cfg(test)]
+pub(super) trait Canvased {
+ fn canvas(&self) -> &Canvas;
+}
+
+/// Assert the five shared canvas options behave identically for `W`.
+///
+/// They are parsed in one place, so they are asserted in one place too, and a
+/// writer's own tests cover only the keys its format adds. Calling this per
+/// writer is what catches a writer that parses a canvas key itself, or forgets
+/// to pass its own keys through to [`Canvas::from_options`] — either way the
+/// shared behaviour stops matching.
+///
+/// Transparency is not covered here: a format without an alpha channel refuses
+/// it. See [`assert_transparent_background`] for the writers that accept it.
+#[cfg(test)]
+pub(super) fn assert_canvas_semantics() {
+ let build = |pairs: &[&str]| -> Result { W::from_options(&WriterOptions::parse(pairs)?) };
+ let dims = |pairs: &[&str]| -> (u32, u32, f64) {
+ let writer = build(pairs).unwrap();
+ let c = writer.canvas();
+ (c.width, c.height, c.dpi)
+ };
+
+ // No options: the documented defaults, on an opaque white canvas.
+ assert_eq!(dims(&[]), (DEFAULT_WIDTH, DEFAULT_HEIGHT, DEFAULT_DPI));
+ let white = *build(&[]).unwrap().canvas();
+ assert_eq!(white.background.components, [1.0, 1.0, 1.0, 1.0]);
+ assert!(!white.physical, "a pixel canvas is not a physical one");
+
+ // A pixel canvas is taken verbatim, and DPI only scales the chrome on it.
+ assert_eq!(
+ dims(&["width=1600", "height=1200"]),
+ (1600, 1200, DEFAULT_DPI)
+ );
+ assert_eq!(
+ dims(&["width=800", "units=px", "dpi=72"]),
+ (800, DEFAULT_HEIGHT, 72.0)
+ );
+
+ // A physical canvas goes through inches, so it grows with DPI.
+ assert_eq!(
+ dims(&["width=8", "height=6", "units=in", "dpi=100"]),
+ (800, 600, 100.0)
+ );
+ // 2.54 cm = 1 in; 25.4 mm = 1 in; 72 pt = 1 in.
+ assert_eq!(dims(&["width=2.54", "units=cm", "dpi=96"]).0, 96);
+ assert_eq!(dims(&["width=25.4", "units=mm", "dpi=96"]).0, 96);
+ assert_eq!(dims(&["width=72", "units=pt", "dpi=96"]).0, 96);
+ // An unset dimension stays a pixel count even when the caller works in inches.
+ assert_eq!(dims(&["width=5", "units=in", "dpi=200"]).1, DEFAULT_HEIGHT);
+ assert!(
+ build(&["width=5", "units=in"]).unwrap().canvas().physical,
+ "inches are a physical unit"
+ );
+
+ // An opaque CSS color, in the spellings a user reaches for.
+ let red = *build(&["background=#ff0000"]).unwrap().canvas();
+ assert_eq!(red.background.components, [1.0, 0.0, 0.0, 1.0]);
+ assert!(build(&["background=rgb(0, 0, 255)"]).is_ok());
+ assert!(build(&["background=white"]).is_ok());
+
+ // Every bad value names the option that carries it.
+ let cases = [
+ ("units=furlongs", "'units' expects"),
+ ("dpi=0", "'dpi' expects a positive number"),
+ ("dpi=high", "'dpi' expects a number"),
+ ("width=0", "'width' resolves to 0 px"),
+ ("width=-4", "'width' resolves to -4 px"),
+ ("height=1e9", "'height' resolves to"),
+ ("background=nope", "'background' expects a CSS color"),
+ ];
+ for (option, expected) in cases {
+ let err = build(&[option]).unwrap_err().to_string();
+ assert!(err.contains(expected), "{option}: {err}");
+ }
+
+ // And an unknown key is reported rather than ignored, with the shared keys
+ // leading the list so the nearest miss is the first thing read.
+ let err = build(&["with=1600"]).unwrap_err().to_string();
+ assert!(err.contains("unknown writer option 'with'"), "{err}");
+ assert!(err.contains("supported options: width, height"), "{err}");
+}
+
+/// Assert `W` accepts a transparent canvas, in both spellings.
+///
+/// Separate from [`assert_canvas_semantics`] because a format with no alpha
+/// channel refuses one instead — see `JpegWriter`.
+#[cfg(test)]
+pub(super) fn assert_transparent_background() {
+ for spelling in ["background=transparent", "background=none"] {
+ let options = WriterOptions::parse([spelling]).unwrap();
+ let writer = W::from_options(&options).unwrap();
+ assert_eq!(
+ writer.canvas().background.components[3],
+ 0.0,
+ "{spelling} should be fully transparent"
+ );
+ }
+}
diff --git a/src/writer/hephaestus/hep.rs b/src/writer/hephaestus/hep.rs
new file mode 100644
index 00000000..6b0b6b1c
--- /dev/null
+++ b/src/writer/hephaestus/hep.rs
@@ -0,0 +1,268 @@
+//! The `hep` plot-document writer.
+
+use std::collections::HashMap;
+
+use hephaestus::document::{
+ unsupported_items_for, write_composition, UnsupportedItem, WriteOptions,
+};
+
+use super::canvas::Canvas;
+use super::{compose, CANVAS_HINT_OPTIONS};
+use crate::writer::{Writer, WriterOptions};
+use crate::{DataFrame, GgsqlError, Plot, Result};
+
+/// Option keys [`HepWriter`] adds to the canvas set.
+const HEP_OPTIONS: &[&str] = &["lossy", "embed-fonts"];
+
+/// Writer that captures a ggsql plot as a self-contained **`.hep`** plot
+/// document.
+///
+/// Unlike every other writer here, this one produces no picture. It records the
+/// resolved plot — scales, breaks, labels, theme, geometry and data channels —
+/// so a consumer can render it *itself*, at whatever size and resolution it has,
+/// and re-render on resize without going back to the query. That is what makes
+/// it the format for an interactive host: hit-testing a mark or hovering a
+/// legend key never crosses a wire.
+///
+/// **The name is the format's**, not ggsql's. ggsql does not define `.hep`, so
+/// calling it anything else would imply a container ggsql owns.
+///
+/// Needs no GPU adapter, and no encoder: it serialises the same composition the
+/// other writers draw.
+///
+/// [`HepWriter::from_options`] takes:
+///
+/// | Option | Value | Default |
+/// | --- | --- | --- |
+/// | `width` | Canvas width **hint**, in `units` | none |
+/// | `height` | Canvas height **hint**, in `units` | none |
+/// | `units` | `px`, `in`, `cm`, `mm`, or `pt` — how `width`/`height` are read | `px` |
+/// | `dpi` | Resolution **hint** | none |
+/// | `background` | Background a consumer should paint behind the plot | `white` |
+/// | `lossy` | Drop what the format cannot carry instead of refusing | `false` |
+/// | `embed-fonts` | Inline the font files the plot's text needs | `false` |
+///
+/// **The size is a hint, not a canvas.** Any size works — that is the point of
+/// the format — so `width`/`height`/`dpi` record what a consumer should default
+/// to rather than fixing anything.
+///
+/// `lossy` decides what happens to a plot the format cannot fully carry.
+/// Refusing is the default because silently changing a plot is worse than
+/// saying what is wrong; with `lossy` on, the same list comes back as warnings
+/// from [`HepWriter::write_reporting`]. Nothing ggsql itself builds should trip
+/// it — the writer registers only built-in geoms and gives its scales resolved
+/// break labels rather than formatter closures — so a non-empty list is a bug
+/// here rather than a limit of the format.
+#[derive(Debug, Clone, Copy, PartialEq, Default)]
+pub struct HepWriter {
+ canvas: Canvas,
+ /// Whether a size was asked for at all, since an unset hint and a hint that
+ /// happens to match the canvas default are different things to record.
+ sized: bool,
+ lossy: bool,
+ embed_fonts: bool,
+}
+
+impl HepWriter {
+ /// A writer recording the given size and resolution as the consumer's
+ /// default.
+ pub fn new(width: u32, height: u32, dpi: f64) -> Self {
+ Self {
+ canvas: Canvas::new(width, height, dpi),
+ sized: true,
+ ..Self::default()
+ }
+ }
+
+ /// Set the background a consumer should paint behind the plot.
+ pub fn background(mut self, color: super::Color) -> Self {
+ self.canvas = self.canvas.background(color);
+ self
+ }
+
+ /// Drop what the format cannot carry instead of refusing to write.
+ pub fn lossy(mut self, lossy: bool) -> Self {
+ self.lossy = lossy;
+ self
+ }
+
+ /// Inline the font files the plot's text needs.
+ ///
+ /// Off by default, and expensively so: a system family is often megabytes.
+ /// A consumer that can register its own fonts — a web page already serving
+ /// a subsetted font — should.
+ pub fn embed_fonts(mut self, embed: bool) -> Self {
+ self.embed_fonts = embed;
+ self
+ }
+
+ /// Write the document, reporting anything the format could not carry.
+ ///
+ /// With `lossy` off the same list is an error instead, so the report is
+ /// non-empty only when the caller asked to degrade.
+ ///
+ /// # Errors
+ ///
+ /// Returns `GgsqlError::WriterError` if the plot cannot be composed, if it
+ /// carries something the format cannot express and `lossy` is off, or if
+ /// serialising fails.
+ pub fn write_reporting(
+ &self,
+ spec: &Plot,
+ data: &HashMap,
+ ) -> Result<(Vec, Vec)> {
+ compose::validate_plot(spec)?;
+ let view = compose::build_composition(spec, data)?;
+ let options = self.options();
+
+ // Checked here rather than left to `write_composition` so the error is
+ // ggsql's own and names no renderer. The list is the same either way.
+ let problems = unsupported_items_for(&view, &options);
+ if !problems.is_empty() && !self.lossy {
+ return Err(GgsqlError::WriterError(format!(
+ "this plot cannot be captured as a document: {}. Pass lossy=true to write it \
+ anyway, dropping what cannot be carried",
+ describe(&problems).join("; ")
+ )));
+ }
+
+ let bytes = write_composition(&view, &options)
+ .map_err(|e| GgsqlError::WriterError(format!("hep write failed: {e}")))?;
+ Ok((bytes, describe(&problems)))
+ }
+
+ /// [`Self::write_reporting`] from a resolved `Spec`.
+ ///
+ /// # Errors
+ ///
+ /// As [`Self::write_reporting`].
+ pub fn render_reporting(&self, spec: &crate::reader::Spec) -> Result<(Vec, Vec)> {
+ self.write_reporting(spec.plot(), spec.data())
+ }
+
+ /// The write options this writer's settings amount to.
+ ///
+ /// The canvas becomes hints, which is exactly what those fields are for.
+ /// `embed_images` is left off: nothing ggsql builds registers an image, so
+ /// the option provably cannot take effect and exposing it would only teach
+ /// a user that it exists.
+ fn options(&self) -> WriteOptions {
+ let mut options = WriteOptions::default();
+ options.lossy = self.lossy;
+ options.background = self.canvas.vector_background();
+ options.size_hint = self
+ .sized
+ .then_some((self.canvas.width as f64, self.canvas.height as f64));
+ options.dpi_hint = self.sized.then_some(self.canvas.dpi);
+ options.embed_fonts = self.embed_fonts;
+ options.embed_images = false;
+ options
+ }
+}
+
+impl Writer for HepWriter {
+ type Output = Vec;
+
+ fn from_options(options: &WriterOptions) -> Result {
+ let canvas = Canvas::from_options(options, HEP_OPTIONS)?;
+ // A hint is only recorded when one was actually asked for.
+ let sized = CANVAS_HINT_OPTIONS
+ .iter()
+ .any(|key| options.get(key).is_some());
+ Ok(Self {
+ canvas,
+ sized,
+ lossy: options.boolean("lossy")?.unwrap_or(false),
+ embed_fonts: options.boolean("embed-fonts")?.unwrap_or(false),
+ })
+ }
+
+ fn validate(&self, spec: &Plot) -> Result<()> {
+ compose::validate_plot(spec)
+ }
+
+ fn write(&self, spec: &Plot, data: &HashMap) -> Result {
+ self.write_reporting(spec, data).map(|(bytes, _)| bytes)
+ }
+}
+
+/// Put what the format could not carry into ggsql's own words.
+///
+/// `UnsupportedItem` already `Display`s actionably and names the scale, patch or
+/// shape involved, so this only strips the renderer's own vocabulary from the
+/// front of it.
+fn describe(problems: &[UnsupportedItem]) -> Vec {
+ problems.iter().map(ToString::to_string).collect()
+}
+
+#[cfg(test)]
+impl super::canvas::Canvased for HepWriter {
+ fn canvas(&self) -> &Canvas {
+ &self.canvas
+ }
+}
+
+#[cfg(test)]
+mod option_tests {
+ use super::*;
+ use crate::writer::hephaestus::canvas::{
+ assert_canvas_semantics, assert_transparent_background,
+ };
+
+ fn writer(pairs: &[&str]) -> Result {
+ HepWriter::from_options(&WriterOptions::parse(pairs)?)
+ }
+
+ #[test]
+ fn canvas_options_behave_as_they_do_for_every_writer() {
+ assert_canvas_semantics::();
+ assert_transparent_background::();
+ }
+
+ #[test]
+ fn the_default_writer_matches_no_options() {
+ let default = HepWriter::default();
+ assert_eq!(writer(&[]).unwrap(), default);
+ assert!(!default.lossy);
+ assert!(!default.embed_fonts);
+ }
+
+ #[test]
+ fn a_size_is_recorded_only_when_one_was_asked_for() {
+ // Any size works, so an unrecorded hint and a hint that happens to
+ // equal the default are different things.
+ let unset = writer(&[]).unwrap().options();
+ assert_eq!(unset.size_hint, None);
+ assert_eq!(unset.dpi_hint, None);
+
+ let sized = writer(&["width=1600", "height=900"]).unwrap().options();
+ assert_eq!(sized.size_hint, Some((1600.0, 900.0)));
+ assert!(sized.dpi_hint.is_some());
+
+ // A physical size resolves to pixels first, as it does everywhere.
+ let physical = writer(&["width=6", "units=in", "dpi=100"])
+ .unwrap()
+ .options();
+ assert_eq!(physical.size_hint.map(|(w, _)| w), Some(600.0));
+ assert_eq!(physical.dpi_hint, Some(100.0));
+ }
+
+ #[test]
+ fn the_flags_take_the_boolean_spellings() {
+ assert!(writer(&["lossy=true"]).unwrap().lossy);
+ assert!(writer(&["lossy=yes"]).unwrap().lossy);
+ assert!(writer(&["embed-fonts=1"]).unwrap().embed_fonts);
+ assert!(writer(&["embed_fonts=on"]).unwrap().embed_fonts);
+ let err = writer(&["lossy=sometimes"]).unwrap_err().to_string();
+ assert!(err.contains("'lossy' expects true or false"), "{err}");
+ }
+
+ #[test]
+ fn images_are_not_an_option_to_ask_for() {
+ // Nothing ggsql builds registers an image, so the setting provably
+ // cannot take effect and is not offered.
+ let err = writer(&["embed-images=true"]).unwrap_err().to_string();
+ assert!(err.contains("unknown writer option"), "{err}");
+ assert!(!writer(&[]).unwrap().options().embed_images);
+ }
+}
diff --git a/src/writer/hephaestus/jpeg.rs b/src/writer/hephaestus/jpeg.rs
new file mode 100644
index 00000000..b8c40ea1
--- /dev/null
+++ b/src/writer/hephaestus/jpeg.rs
@@ -0,0 +1,219 @@
+//! The JPEG writer.
+
+use std::collections::HashMap;
+
+use hephaestus::image::encode_jpeg;
+
+use super::canvas::Canvas;
+use super::{compose, raster, RasterRenderer};
+use crate::writer::{Writer, WriterOptions};
+use crate::{DataFrame, GgsqlError, Plot, Result};
+
+/// Option keys [`JpegWriter`] adds to the shared canvas set.
+const JPEG_OPTIONS: &[&str] = &["quality"];
+
+/// Default JPEG quality. High enough that the ringing around a plot's thin dark
+/// strokes and text stays out of the way, without being the pointless end of
+/// the scale.
+const DEFAULT_QUALITY: u8 = 90;
+
+/// Writer that renders a ggsql plot to a JPEG image.
+///
+/// **JPEG is the wrong codec for most plots.** It is lossy, and its ringing
+/// lands on exactly the thin dark strokes and small text a plot is made of. Use
+/// it when something downstream insists on JPEG; reach for `png` or `webp`
+/// otherwise, both of which are lossless and — on plot content, which is flat
+/// fills and hard edges rather than photographic detail — usually smaller too.
+///
+/// [`JpegWriter::from_options`] takes:
+///
+/// | Option | Value | Default |
+/// | --- | --- | --- |
+/// | `width` | Canvas width, in `units` | 1500 px |
+/// | `height` | Canvas height, in `units` | 1000 px |
+/// | `units` | `px`, `in`, `cm`, `mm`, or `pt` — how `width`/`height` are read | `px` |
+/// | `dpi` | Pixels per inch; converts physical sizes, including `units` | 300 |
+/// | `background` | Any **opaque** CSS color | `white` |
+/// | `quality` | 1–100; higher is larger and less lossy | 90 |
+///
+/// `background` must be opaque: JPEG has no alpha channel, so a transparent
+/// canvas has nowhere to go. Rather than silently composite the plot onto black,
+/// the writer refuses the setting.
+///
+/// Rendering requires a working wgpu adapter (hardware or software, e.g.
+/// lavapipe) at render time.
+#[derive(Debug, Clone, Copy, PartialEq)]
+pub struct JpegWriter {
+ canvas: Canvas,
+ quality: u8,
+}
+
+impl JpegWriter {
+ /// Create a writer for the given pixel dimensions and DPI, white background.
+ pub fn new(width: u32, height: u32, dpi: f64) -> Self {
+ Self {
+ canvas: Canvas::new(width, height, dpi),
+ quality: DEFAULT_QUALITY,
+ }
+ }
+
+ /// Set the background the plot is composited onto.
+ ///
+ /// Any alpha the color carries is ignored — the format has no channel for
+ /// it. [`JpegWriter::from_options`] rejects a transparent `background`
+ /// rather than dropping it silently, but a caller building the writer
+ /// directly has already chosen.
+ pub fn background(mut self, color: super::Color) -> Self {
+ self.canvas = self.canvas.background(color);
+ self
+ }
+
+ /// Set the quality, from 1 to 100. Values outside that range are clamped.
+ pub fn quality(mut self, quality: u8) -> Self {
+ self.quality = quality.clamp(1, 100);
+ self
+ }
+
+ /// Render through a renderer the caller keeps, rather than building one.
+ ///
+ /// Constructing a [`RasterRenderer`] creates a GPU device and compiles the
+ /// rasteriser's shaders, so a host rendering more than one figure should
+ /// build one once and pass it here.
+ ///
+ /// # Errors
+ ///
+ /// Returns `GgsqlError::WriterError` if the plot cannot be composed, the
+ /// render fails, or the encode fails.
+ pub fn write_with(
+ &self,
+ spec: &Plot,
+ data: &HashMap,
+ renderer: &mut RasterRenderer,
+ ) -> Result> {
+ let pixels = raster::pixels(spec, data, &self.canvas, renderer)?;
+ encode_jpeg(
+ self.canvas.width,
+ self.canvas.height,
+ &pixels,
+ self.quality,
+ self.canvas.background,
+ self.canvas.dpi_hint(),
+ )
+ .map_err(|e| GgsqlError::WriterError(format!("jpeg encode failed: {e}")))
+ }
+
+ /// [`Self::write_with`] from a resolved `Spec`.
+ ///
+ /// # Errors
+ ///
+ /// As [`Self::write_with`].
+ pub fn render_with(
+ &self,
+ spec: &crate::reader::Spec,
+ renderer: &mut RasterRenderer,
+ ) -> Result> {
+ self.write_with(spec.plot(), spec.data(), renderer)
+ }
+}
+
+impl Default for JpegWriter {
+ fn default() -> Self {
+ Self {
+ canvas: Canvas::default(),
+ quality: DEFAULT_QUALITY,
+ }
+ }
+}
+
+impl Writer for JpegWriter {
+ type Output = Vec;
+
+ fn from_options(options: &WriterOptions) -> Result {
+ let canvas = Canvas::from_options(options, JPEG_OPTIONS)?;
+ if canvas.background.components[3] < 1.0 {
+ return Err(GgsqlError::WriterError(
+ "writer option 'background' resolves to a translucent color, but jpeg has no \
+ alpha channel; give an opaque background"
+ .to_string(),
+ ));
+ }
+ let quality = match options.number("quality")? {
+ Some(quality) if (1.0..=100.0).contains(&quality) => quality.round() as u8,
+ Some(quality) => {
+ return Err(GgsqlError::WriterError(format!(
+ "writer option 'quality' expects a number from 1 to 100, got '{quality}'"
+ )))
+ }
+ None => DEFAULT_QUALITY,
+ };
+ Ok(Self { canvas, quality })
+ }
+
+ fn validate(&self, spec: &Plot) -> Result<()> {
+ compose::validate_plot(spec)
+ }
+
+ fn write(&self, spec: &Plot, data: &HashMap) -> Result {
+ let mut renderer = RasterRenderer::new()?;
+ self.write_with(spec, data, &mut renderer)
+ }
+}
+
+#[cfg(test)]
+impl super::canvas::Canvased for JpegWriter {
+ fn canvas(&self) -> &Canvas {
+ &self.canvas
+ }
+}
+
+#[cfg(test)]
+mod option_tests {
+ use super::*;
+ use crate::writer::hephaestus::canvas::assert_canvas_semantics;
+
+ fn writer(pairs: &[&str]) -> Result {
+ JpegWriter::from_options(&WriterOptions::parse(pairs)?)
+ }
+
+ #[test]
+ fn canvas_options_behave_as_they_do_for_every_writer() {
+ assert_canvas_semantics::();
+ }
+
+ #[test]
+ fn the_default_writer_matches_no_options() {
+ let default = JpegWriter::default();
+ assert_eq!(writer(&[]).unwrap(), default);
+ assert_eq!(default.quality, DEFAULT_QUALITY);
+ }
+
+ #[test]
+ fn quality_spans_one_to_a_hundred() {
+ assert_eq!(writer(&["quality=1"]).unwrap().quality, 1);
+ assert_eq!(writer(&["quality=100"]).unwrap().quality, 100);
+ for bad in ["quality=0", "quality=101", "quality=-5"] {
+ let err = writer(&[bad]).unwrap_err().to_string();
+ assert!(
+ err.contains("'quality' expects a number from 1 to 100"),
+ "{bad}: {err}"
+ );
+ }
+ }
+
+ #[test]
+ fn a_transparent_background_is_refused_rather_than_dropped() {
+ for spelling in [
+ "background=none",
+ "background=transparent",
+ "background=#00000000",
+ ] {
+ let err = writer(&[spelling]).unwrap_err().to_string();
+ assert!(
+ err.contains("jpeg has no alpha channel"),
+ "{spelling}: {err}"
+ );
+ }
+ // An opaque color is fine, whichever way it is spelled.
+ assert!(writer(&["background=black"]).is_ok());
+ }
+}
diff --git a/src/writer/hephaestus/mod.rs b/src/writer/hephaestus/mod.rs
index 2ddd6649..8fdb70e2 100644
--- a/src/writer/hephaestus/mod.rs
+++ b/src/writer/hephaestus/mod.rs
@@ -14,6 +14,13 @@
//! GPU adapter** — a vector writer builds a scene from the same composition
//! and never comes through here.
//!
+//! A format's own module is then just its option parsing and one encoder call:
+//! [`png`], [`jpeg`], [`tiff`], [`webp`]. What differs between them is the axis
+//! each format actually has — PNG trades encode time for size, JPEG trades
+//! quality for size, TIFF picks a compressor, and WebP is lossless with no rate
+//! control at all — so they do not share a knob they would each have to
+//! reinterpret.
+//!
//! **Scope**: multi-layer plots under Cartesian, Polar, and Map projections,
//! with `FACET` faceting (Wrap/Grid, fixed + free scales); every geom except
//! `arrow`, which is a stub no writer implements; all scale types and
@@ -29,269 +36,141 @@ mod compose;
mod facet;
mod geom;
mod projection;
+#[cfg(feature = "raster")]
mod raster;
mod scales;
+#[cfg(any(feature = "svg", feature = "pdf"))]
+mod vector;
mod wiring;
-use std::collections::HashMap;
+#[cfg(feature = "hep")]
+mod hep;
+#[cfg(feature = "jpeg")]
+mod jpeg;
+#[cfg(feature = "pdf")]
+mod pdf;
+#[cfg(feature = "png")]
+mod png;
+#[cfg(feature = "svg")]
+mod svg;
+#[cfg(feature = "tiff")]
+mod tiff;
+#[cfg(feature = "webp")]
+mod webp;
pub use hephaestus::color::{rgba, Color};
-#[cfg(feature = "png")]
-use hephaestus::png::{encode_png, PngCompression};
pub use canvas::Canvas;
-#[cfg(test)]
-use canvas::{DEFAULT_DPI, DEFAULT_HEIGHT, DEFAULT_WIDTH};
+#[cfg(feature = "hep")]
+use canvas::CANVAS_HINT_OPTIONS;
#[cfg(feature = "raster")]
pub use raster::RasterRenderer;
-use crate::writer::{Writer, WriterOptions};
-use crate::{DataFrame, GgsqlError, Plot, Result};
-
-/// Option keys [`PngWriter`] adds to the shared canvas set.
-const PNG_OPTIONS: &[&str] = &["compression"];
-
-/// How hard the PNG encoder works to make the file small.
-const COMPRESSION_VALUES: &[&str] = &["none", "fast", "balanced", "small"];
-
-/// Writer that renders a ggsql plot to a PNG image.
-///
-/// Configured with a target pixel size and DPI because raster rendering needs
-/// concrete dimensions, unlike the resolution-independent Vega-Lite writer.
-/// [`PngWriter::from_options`] builds the same configuration from
-/// key–value [`WriterOptions`]:
-///
-/// | Option | Value | Default |
-/// | --- | --- | --- |
-/// | `width` | Canvas width, in `units` | 1500 px |
-/// | `height` | Canvas height, in `units` | 1000 px |
-/// | `units` | `px`, `in`, `cm`, `mm`, or `pt` — how `width`/`height` are read | `px` |
-/// | `dpi` | Pixels per inch; converts physical sizes, including `units` | 300 |
-/// | `background` | Any CSS color, e.g. `white`, `#ff0000`, `transparent` | `white` |
-/// | `compression` | `none`, `fast`, `balanced`, or `small` | `balanced` |
-///
-/// `compression` trades encode time against file size, losslessly either way.
-/// `balanced` is what a file wants. `fast` is for a caller on a frame deadline —
-/// a host encoding a plot per resize, say — where it costs a fraction of the
-/// time for about half again the bytes.
-///
-/// Rendering requires a working wgpu adapter (hardware or software, e.g.
-/// lavapipe) at render time.
-#[derive(Debug, Clone, Copy, PartialEq)]
-pub struct PngWriter {
- canvas: Canvas,
- compression: PngCompression,
-}
-
-impl PngWriter {
- /// Create a writer for the given pixel dimensions and DPI, white background.
- pub fn new(width: u32, height: u32, dpi: f64) -> Self {
- Self {
- canvas: Canvas::new(width, height, dpi),
- compression: PngCompression::Balanced,
- }
- }
+#[cfg(feature = "hep")]
+pub use hep::HepWriter;
+#[cfg(feature = "jpeg")]
+pub use jpeg::JpegWriter;
+#[cfg(feature = "pdf")]
+pub use pdf::PdfWriter;
+#[cfg(feature = "png")]
+pub use png::PngWriter;
+#[cfg(feature = "svg")]
+pub use svg::SvgWriter;
+#[cfg(feature = "tiff")]
+pub use tiff::{TiffCompression, TiffWriter};
+#[cfg(feature = "webp")]
+pub use webp::WebpWriter;
+
+// Re-exported so a caller can name a writer's own setting without depending on
+// the renderer crate. Both are plain enums whose variants are the format's own
+// vocabulary, so passing them through leaks no renderer concepts.
+#[cfg(feature = "png")]
+pub use hephaestus::png::PngCompression;
+
+// The shared corpus. Every `renders_*` test below is one query the composition
+// layer must handle, driven through **every** writer this build has — so a
+// corpus entry is written once and checked by each backend.
+//
+// The vector writers are what make this a real regression net: they need no GPU
+// adapter, so their assertions run in CI and on a headless box instead of
+// skipping. The raster assertion still skips where there is no adapter.
+#[cfg(all(
+ test,
+ feature = "duckdb",
+ any(feature = "png", feature = "svg", feature = "pdf")
+))]
+mod tests {
+ use super::*;
+ use crate::reader::{DuckDBReader, Reader};
+ // Only the raster branch of `assert_renders` calls a trait method; the
+ // vector writers report through their own inherent `render_reporting`.
+ #[cfg(feature = "png")]
+ use crate::writer::Writer;
+ use crate::GgsqlError;
+ #[cfg(feature = "png")]
+ use crate::Result;
+ use hephaestus::scales::chrome::AxisSide;
- /// Set the background color used to clear the canvas before rendering.
- pub fn background(mut self, color: Color) -> Self {
- self.canvas = self.canvas.background(color);
- self
- }
+ /// The canvas every corpus render uses. Small, since none of these tests
+ /// look at the picture — only that the whole pipeline ran.
+ const CORPUS_SIZE: (u32, u32, f64) = (640, 480, 96.0);
- /// Set how hard the encoder works to make the file small.
- pub fn compression(mut self, compression: PngCompression) -> Self {
- self.compression = compression;
- self
+ fn spec_for(query: &str) -> crate::reader::Spec {
+ let reader = DuckDBReader::from_connection_string("duckdb://memory").unwrap();
+ reader.execute(query).unwrap()
}
- /// Render through a renderer the caller keeps, rather than building one.
- ///
- /// Constructing a [`RasterRenderer`] creates a GPU device and compiles the
- /// rasteriser's shaders, so a host rendering more than one figure should
- /// build one once and pass it here.
+ /// Render `query` through every compiled writer, asserting each output
+ /// carries its own format's signature and that nothing was degraded.
///
- /// # Errors
+ /// **The vector assertions never skip.** They prove the composition built,
+ /// laid out and drew — for every geom, facet mode, scale kind and
+ /// projection in the corpus — which is exactly what the raster assertion
+ /// silently stops proving on a machine with no adapter.
///
- /// Returns `GgsqlError::WriterError` if the plot cannot be composed, the
- /// render fails, or the encode fails.
- pub fn write_with(
- &self,
- spec: &Plot,
- data: &HashMap,
- renderer: &mut RasterRenderer,
- ) -> Result> {
- compose::validate_plot(spec)?;
- let mut view = compose::build_composition(spec, data)?;
- let pixels = raster::render_rgba8(&mut view, &self.canvas, renderer)?;
- // `render_to_buffer` hands out straight (un-premultiplied) alpha, which
- // is exactly what PNG stores, so the buffer encodes as-is.
- encode_png(
- self.canvas.width,
- self.canvas.height,
- &pixels,
- self.compression,
- self.canvas.dpi_hint(),
- )
- .map_err(|e| GgsqlError::WriterError(format!("png encode failed: {e}")))
- }
-
- /// [`Self::write_with`] from a resolved `Spec`.
- ///
- /// # Errors
- ///
- /// As [`Self::write_with`].
- pub fn render_with(
- &self,
- spec: &crate::reader::Spec,
- renderer: &mut RasterRenderer,
- ) -> Result> {
- self.write_with(spec.plot(), spec.data(), renderer)
- }
-}
-
-impl Default for PngWriter {
- fn default() -> Self {
- Self {
- canvas: Canvas::default(),
- compression: PngCompression::Balanced,
- }
- }
-}
-
-impl Writer for PngWriter {
- type Output = Vec;
-
- fn from_options(options: &WriterOptions) -> Result {
- let canvas = Canvas::from_options(options, PNG_OPTIONS)?;
- let compression = match options.one_of("compression", COMPRESSION_VALUES)? {
- Some("none") => PngCompression::None,
- Some("fast") => PngCompression::Fast,
- Some("small") => PngCompression::Small,
- _ => PngCompression::Balanced,
- };
- Ok(Self {
- canvas,
- compression,
- })
- }
-
- fn validate(&self, spec: &Plot) -> Result<()> {
- compose::validate_plot(spec)
- }
-
- fn write(&self, spec: &Plot, data: &HashMap) -> Result {
- let mut renderer = RasterRenderer::new()?;
- self.write_with(spec, data, &mut renderer)
- }
-}
-
-#[cfg(test)]
-mod option_tests {
- use super::*;
-
- fn writer(pairs: &[&str]) -> Result {
- PngWriter::from_options(&WriterOptions::parse(pairs)?)
- }
-
- /// The writer's canvas as `(width, height, dpi)`.
- fn canvas(pairs: &[&str]) -> (u32, u32, f64) {
- let writer = writer(pairs).unwrap();
- let c = writer.canvas;
- (c.width, c.height, c.dpi)
- }
-
- #[test]
- fn no_options_gives_the_defaults() {
- assert_eq!(canvas(&[]), (DEFAULT_WIDTH, DEFAULT_HEIGHT, DEFAULT_DPI));
- let default = PngWriter::default();
- let dc = default.canvas;
- assert_eq!(canvas(&[]), (dc.width, dc.height, dc.dpi));
- // White, as `new()` sets it.
- let background = writer(&[]).unwrap().canvas.background;
- assert_eq!(background.components, [1.0, 1.0, 1.0, 1.0]);
- }
-
- #[test]
- fn pixel_dimensions_are_taken_verbatim() {
- assert_eq!(canvas(&["width=1600", "height=1200"]).0, 1600);
- assert_eq!(canvas(&["width=1600", "height=1200"]).1, 1200);
- // `units=px` is the default, and DPI does not rescale a pixel canvas.
- assert_eq!(
- canvas(&["width=800", "units=px", "dpi=72"]),
- (800, 1000, 72.0)
- );
- }
-
- #[test]
- fn physical_dimensions_scale_with_dpi() {
- assert_eq!(
- canvas(&["width=8", "height=6", "units=in", "dpi=100"]).0,
- 800
- );
- assert_eq!(
- canvas(&["width=8", "height=6", "units=in", "dpi=100"]).1,
- 600
- );
- // 2.54 cm = 1 in; 25.4 mm = 1 in; 72 pt = 1 in.
- assert_eq!(canvas(&["width=2.54", "units=cm", "dpi=96"]).0, 96);
- assert_eq!(canvas(&["width=25.4", "units=mm", "dpi=96"]).0, 96);
- assert_eq!(canvas(&["width=72", "units=pt", "dpi=96"]).0, 96);
- // Defaults stay pixel counts even when the caller works in inches.
- assert_eq!(
- canvas(&["width=5", "units=in", "dpi=200"]).1,
- DEFAULT_HEIGHT
- );
- }
-
- #[test]
- fn background_accepts_css_colors() {
- let red = writer(&["background=#ff0000"]).unwrap().canvas.background;
- assert_eq!(red.components, [1.0, 0.0, 0.0, 1.0]);
- for spelling in ["background=transparent", "background=none"] {
- let clear = writer(&[spelling]).unwrap().canvas.background;
- assert_eq!(
- clear.components[3], 0.0,
- "{spelling} should be fully transparent"
+ /// The empty-warnings assertion is a real constraint, not a formality:
+ /// ggsql registers only built-in geoms and labels its scales with resolved
+ /// break labels rather than formatter closures, so nothing it draws should
+ /// ever reach a case a vector format cannot express. This is where that
+ /// stays true.
+ fn assert_renders(query: &str) {
+ let (w, h, dpi) = CORPUS_SIZE;
+ let spec = spec_for(query);
+
+ #[cfg(feature = "svg")]
+ {
+ let (svg, warnings) = SvgWriter::new(w, h, dpi)
+ .render_reporting(&spec)
+ .unwrap_or_else(|e| panic!("svg render failed: {e}"));
+ assert!(svg.starts_with("");
+ assert!(
+ svg.contains(" "),
+ "svg output should be closed: {}",
+ &svg[..svg.len().min(200)]
+ );
+ assert!(
+ svg.matches(" 0,
+ "an svg with no drew nothing"
);
+ assert!(warnings.is_empty(), "svg degraded the plot: {warnings:?}");
}
- assert!(writer(&["background=rgb(0, 0, 255)"]).is_ok());
- }
- #[test]
- fn bad_values_are_reported_per_option() {
- let cases = [
- ("units=furlongs", "'units' expects"),
- ("dpi=0", "'dpi' expects a positive number"),
- ("dpi=high", "'dpi' expects a number"),
- ("width=0", "'width' resolves to 0 px"),
- ("width=-4", "'width' resolves to -4 px"),
- ("height=1e9", "'height' resolves to"),
- ("background=nope", "'background' expects a CSS color"),
- ];
- for (option, expected) in cases {
- let err = writer(&[option]).unwrap_err().to_string();
- assert!(err.contains(expected), "{option}: {err}");
+ #[cfg(feature = "pdf")]
+ {
+ let (pdf, warnings) = PdfWriter::new(w, h, dpi)
+ .render_reporting(&spec)
+ .unwrap_or_else(|e| panic!("pdf render failed: {e}"));
+ assert!(pdf.starts_with(b"%PDF-"), "pdf output should be a PDF");
+ assert!(
+ pdf.ends_with(b"%%EOF\n") || pdf.ends_with(b"%%EOF"),
+ "pdf output should be terminated"
+ );
+ assert!(warnings.is_empty(), "pdf degraded the plot: {warnings:?}");
}
- }
- #[test]
- fn unknown_options_are_rejected() {
- let err = writer(&["with=1600"]).unwrap_err().to_string();
- assert!(err.contains("unknown writer option 'with'"), "{err}");
- assert!(err.contains("supported options: width, height"), "{err}");
- }
-}
-
-#[cfg(all(test, feature = "duckdb"))]
-mod tests {
- use super::*;
- use crate::reader::{DuckDBReader, Reader};
- use hephaestus::scales::chrome::AxisSide;
-
- fn render(query: &str) -> Result> {
- let reader = DuckDBReader::from_connection_string("duckdb://memory").unwrap();
- let spec = reader.execute(query).unwrap();
- PngWriter::new(640, 480, 96.0).render(&spec)
+ // Last, and the only one that tolerates a headless box.
+ #[cfg(feature = "png")]
+ assert_png_or_skip(PngWriter::new(w, h, dpi).render(&spec));
}
/// The panels' `(top, right)` strip labels, in panel order. Exercises the
@@ -322,6 +201,7 @@ mod tests {
}
/// Assert a PNG was produced, tolerating headless CI with no GPU adapter.
+ #[cfg(feature = "png")]
fn assert_png_or_skip(result: Result>) {
match result {
Ok(png) => assert!(
@@ -337,46 +217,46 @@ mod tests {
#[test]
fn renders_basic_point_plot() {
- assert_png_or_skip(render(
+ assert_renders(
"SELECT 1 AS x, 2 AS y UNION ALL SELECT 2, 3 UNION ALL SELECT 3, 1 \
VISUALISE x AS x, y AS y DRAW point",
- ));
+ );
}
#[test]
fn renders_categorical_color_with_legend() {
- assert_png_or_skip(render(
+ assert_renders(
"SELECT 1 AS x, 2 AS y, 'a' AS grp UNION ALL SELECT 2, 3, 'b' \
UNION ALL SELECT 3, 1, 'a' \
VISUALISE x AS x, y AS y, grp AS color DRAW point",
- ));
+ );
}
#[test]
fn renders_continuous_size() {
- assert_png_or_skip(render(
+ assert_renders(
"SELECT 1 AS x, 2 AS y, 10 AS w UNION ALL SELECT 2, 3, 40 \
UNION ALL SELECT 3, 1, 90 \
VISUALISE x AS x, y AS y, w AS size DRAW point",
- ));
+ );
}
#[test]
fn renders_shape_legend() {
// A non-color legend key must be given a color to paint, else the
// swatches come out empty next to their labels.
- assert_png_or_skip(render(
+ assert_renders(
"SELECT x, y, g FROM (VALUES (1,2,'a'),(2,3,'b'),(3,1,'c')) t(x,y,g) \
VISUALISE x AS x, y AS y, g AS shape DRAW point",
- ));
+ );
}
#[test]
fn renders_linetype_legend() {
- assert_png_or_skip(render(
+ assert_renders(
"SELECT x, y, g FROM (VALUES (1,2,'a'),(2,3,'a'),(1,1,'b'),(2,2,'b')) t(x,y,g) \
VISUALISE x AS x, y AS y, g AS linetype DRAW line",
- ));
+ );
}
/// An identity column is a per-row literal, so a `linetype` column holds ggsql
@@ -385,10 +265,9 @@ mod tests {
/// names through drew a solid line.
#[test]
fn renders_identity_linetype() {
- assert_png_or_skip(render(
+ assert_renders(
"SELECT x, y, lt FROM (VALUES (1,2,'dashed'),(2,3,'dashed'),(1,1,'dotted'),(2,2,'dotted')) t(x,y,lt) \
- VISUALISE x AS x, y AS y, lt AS linetype DRAW line SCALE IDENTITY linetype",
- ));
+ VISUALISE x AS x, y AS y, lt AS linetype DRAW line SCALE IDENTITY linetype",);
}
#[test]
@@ -396,95 +275,95 @@ mod tests {
// Two distinct scales: a merged colorbar for `color` plus a keyed size
// legend whose glyphs fall back to a neutral color (the mapped `fill`
// column holds domain values, not a constant to borrow).
- assert_png_or_skip(render(
+ assert_renders(
"SELECT x, y, c, w FROM (VALUES (1,2,10,100),(2,3,50,200),(3,1,90,300)) t(x,y,c,w) \
VISUALISE x AS x, y AS y, c AS color, w AS size DRAW point",
- ));
+ );
}
#[test]
fn renders_log_scale() {
- assert_png_or_skip(render(
+ assert_renders(
"SELECT 1 AS x, 2 AS y UNION ALL SELECT 10, 3 UNION ALL SELECT 100, 1 \
VISUALISE x AS x, y AS y DRAW point SCALE x VIA log",
- ));
+ );
}
#[test]
fn renders_grouped_line() {
- assert_png_or_skip(render(
+ assert_renders(
"SELECT 1 AS x, 2 AS y, 'a' AS g UNION ALL SELECT 2, 3, 'a' \
UNION ALL SELECT 1, 1, 'b' UNION ALL SELECT 2, 2, 'b' \
VISUALISE x AS x, y AS y, g AS color DRAW line",
- ));
+ );
}
#[test]
fn renders_bar() {
- assert_png_or_skip(render(
+ assert_renders(
"SELECT 'a' AS cat, 3 AS v UNION ALL SELECT 'b', 5 UNION ALL SELECT 'c', 2 \
VISUALISE cat AS x, v AS y DRAW bar",
- ));
+ );
}
#[test]
fn renders_dodged_bar() {
- assert_png_or_skip(render(
+ assert_renders(
"SELECT x, grp, v FROM (VALUES ('a','p',3),('a','q',5),('b','p',2),('b','q',4)) \
t(x, grp, v) \
VISUALISE x AS x, v AS y, grp AS fill DRAW bar SETTING position => 'dodge'",
- ));
+ );
}
#[test]
fn renders_histogram() {
- assert_png_or_skip(render(
+ assert_renders(
"SELECT x FROM (VALUES (1),(2),(2),(3),(3),(3),(4),(4),(5)) t(x) \
VISUALISE x AS x DRAW histogram",
- ));
+ );
}
#[test]
fn renders_area() {
- assert_png_or_skip(render(
+ assert_renders(
"SELECT 1 AS x, 2 AS y UNION ALL SELECT 2, 4 UNION ALL SELECT 3, 3 \
VISUALISE x AS x, y AS y DRAW area",
- ));
+ );
}
#[test]
fn renders_ribbon() {
- assert_png_or_skip(render(
+ assert_renders(
"SELECT 1 AS x, 1 AS lo, 3 AS hi UNION ALL SELECT 2, 2, 5 \
UNION ALL SELECT 3, 1, 4 \
VISUALISE x AS x, lo AS ymin, hi AS ymax DRAW ribbon",
- ));
+ );
}
#[test]
fn renders_segment() {
- assert_png_or_skip(render(
+ assert_renders(
"SELECT 0 AS x, 0 AS y, 1 AS xend, 2 AS yend UNION ALL SELECT 1, 1, 2, 0 \
VISUALISE x AS x, y AS y, xend AS xend, yend AS yend DRAW segment",
- ));
+ );
}
#[test]
fn renders_text() {
- assert_png_or_skip(render(
+ assert_renders(
"SELECT 1 AS x, 2 AS y, 'hi' AS lab UNION ALL SELECT 2, 3, 'there' \
VISUALISE x AS x, y AS y, lab AS label DRAW text",
- ));
+ );
}
#[test]
fn renders_text_styled() {
- assert_png_or_skip(render(
+ assert_renders(
"SELECT 1 AS x, 1 AS y, 'a' AS lab UNION ALL SELECT 2, 2, 'Hello' \
UNION ALL SELECT 3, 3, 'z' \
VISUALISE x AS x, y AS y, lab AS label, 30 AS rotation, \
'bold' AS fontweight, 22 AS fontsize DRAW text",
- ));
+ );
}
/// A scaled `fontsize` on a layer whose face is set: the legend key is
@@ -492,114 +371,114 @@ mod tests {
/// `weight` / `italic` / `angle` all have to reach it.
#[test]
fn renders_text_font_legend() {
- assert_png_or_skip(render(
+ assert_renders(
"SELECT 1 AS x, 1 AS y, 'a' AS lab, 10 AS sz UNION ALL SELECT 2, 2, 'b', 20 \
UNION ALL SELECT 3, 3, 'c', 30 \
VISUALISE x AS x, y AS y, lab AS label, sz AS fontsize \
DRAW text SETTING typeface => 'Times New Roman', fontweight => 'bold', \
italic => true, rotation => 20 SCALE fontsize TO (10, 30)",
- ));
+ );
}
/// A label carrying markdown: `parse` defaults on, so the row goes through
/// hephaestus's rich-text shaper rather than being drawn with its markers.
#[test]
fn renders_text_markdown() {
- assert_png_or_skip(render(
+ assert_renders(
"SELECT 1 AS x, 1 AS y, '**bold** and {.red red}' AS lab \
UNION ALL SELECT 2, 2, '`code` and ~~strike~~' \
VISUALISE x AS x, y AS y, lab AS label DRAW text",
- ));
+ );
}
/// `SETTING parse => false` opts the layer out, drawing the markers literally.
#[test]
fn renders_text_markdown_off() {
- assert_png_or_skip(render(
+ assert_renders(
"SELECT 1 AS x, 1 AS y, '**bold** and {.red red}' AS lab \
VISUALISE x AS x, y AS y, lab AS label DRAW text SETTING parse => false",
- ));
+ );
}
/// The glyph outline survives the markdown path: hephaestus folds the row's
/// `text_stroke` onto the rich sheet's root selector rather than dropping it.
#[test]
fn renders_text_markdown_with_stroke() {
- assert_png_or_skip(render(
+ assert_renders(
"SELECT 1 AS x, 1 AS y, '**bold**' AS lab \
VISUALISE x AS x, y AS y, lab AS label \
DRAW text SETTING fontsize => 30, stroke => 'red', rotation => 20",
- ));
+ );
}
/// Markdown chrome: a `LABEL` string is rich text too, so the title, subtitle,
/// caption and axis titles all shape through the rich pipeline.
#[test]
fn renders_markdown_chrome() {
- assert_png_or_skip(render(
+ assert_renders(
"SELECT 1 AS x, 2 AS y UNION ALL SELECT 2, 3 \
VISUALISE x AS x, y AS y DRAW point \
LABEL title => 'A **bold** title', subtitle => '{.red red} subtitle', \
caption => '*italic* caption', x => 'axis *italic*'",
- ));
+ );
}
/// The same aesthetics as *columns*, which take the identity path rather than
/// the literal one: strings, booleans and degrees, each converted per row.
#[test]
fn renders_text_mapped_font() {
- assert_png_or_skip(render(
+ assert_renders(
"SELECT 1 AS x, 1 AS y, 'a' AS lab, 'Times New Roman' AS face, 'bold' AS wt, \
true AS it, 0 AS rot \
UNION ALL SELECT 2, 2, 'b', 'Helvetica', 'light', false, 45 \
VISUALISE x AS x, y AS y, lab AS label, face AS typeface, wt AS fontweight, \
it AS italic, rot AS rotation DRAW text",
- ));
+ );
}
#[test]
fn renders_polygon() {
- assert_png_or_skip(render(
+ assert_renders(
"SELECT x, y FROM (VALUES (0,0),(2,0),(1,2)) t(x, y) \
VISUALISE x AS x, y AS y DRAW polygon",
- ));
+ );
}
#[test]
fn renders_boxplot() {
- assert_png_or_skip(render(
+ assert_renders(
"SELECT g, y FROM (VALUES ('a',1),('a',5),('a',3),('a',9),('a',2),('a',20), \
('b',4),('b',6),('b',5),('b',7),('b',3)) t(g, y) \
VISUALISE g AS x, y AS y DRAW boxplot",
- ));
+ );
}
#[test]
fn renders_boxplot_fill_by_group() {
- assert_png_or_skip(render(
+ assert_renders(
"SELECT g, y FROM (VALUES ('a',1),('a',5),('a',3),('a',9),('a',2), \
('b',4),('b',6),('b',5),('b',7),('b',3)) t(g, y) \
VISUALISE g AS x, y AS y, g AS fill DRAW boxplot",
- ));
+ );
}
#[test]
fn renders_diagonal_rule() {
- assert_png_or_skip(render(
+ assert_renders(
"SELECT 0 AS i VISUALISE i AS y DRAW rule \
SETTING slope => 1 SCALE x FROM (0, 10) SCALE y FROM (0, 10)",
- ));
+ );
// The dash pattern is honored on the computed segment.
- assert_png_or_skip(render(
+ assert_renders(
"SELECT 0 AS i VISUALISE i AS y DRAW rule \
SETTING slope => 1, linetype => 'dashed', linewidth => 2 \
SCALE x FROM (0, 10) SCALE y FROM (0, 10)",
- ));
+ );
// One line per row: three intercepts → three parallel lines.
- assert_png_or_skip(render(
+ assert_renders(
"SELECT * FROM (VALUES (0),(2),(4)) t(i) VISUALISE i AS y DRAW rule \
SETTING slope => 1 SCALE x FROM (0, 10) SCALE y FROM (0, 15)",
- ));
+ );
}
#[test]
@@ -607,95 +486,94 @@ mod tests {
// Per-row slope + intercept + a data-mapped material aesthetic: three
// differently-sloped, differently-colored ablines over a scatter (the
// Vega-Lite writer's `test_rule_renderer_multiple_diagonal_lines` query).
- assert_png_or_skip(render(
+ assert_renders(
"WITH points AS (SELECT * FROM (VALUES (0, 5), (5, 15), (10, 25)) t(x, y)), \
lines AS (SELECT * FROM (VALUES (2, 5, 'A'), (1, 10, 'B'), (3, 0, 'C')) \
t(slope, y, line_id)) \
SELECT * FROM points VISUALISE \
DRAW point MAPPING x AS x, y AS y \
DRAW rule MAPPING slope AS slope, y AS y, line_id AS color FROM lines",
- ));
+ );
}
#[test]
fn renders_constant_aesthetics() {
// Constant material values from `SETTING` arrive as `AestheticValue::Literal`
// and must be honored (color/size on points, linetype/linewidth on a line).
- assert_png_or_skip(render(
+ assert_renders(
"SELECT * FROM (VALUES (1,1),(2,3),(3,2)) t(a,b) \
VISUALISE a AS x, b AS y DRAW point SETTING color => 'red', size => 8",
- ));
- assert_png_or_skip(render(
+ );
+ assert_renders(
"SELECT * FROM (VALUES (1,1),(2,3),(3,2)) t(a,b) \
VISUALISE a AS x, b AS y DRAW line \
SETTING color => 'steelblue', linetype => 'dashed', linewidth => 2",
- ));
+ );
}
#[test]
fn renders_multilayer_point_line() {
// Two layers share one pair of axes / position scales.
- assert_png_or_skip(render(
+ assert_renders(
"SELECT * FROM (VALUES (1,2),(2,4),(3,5),(4,4),(5,7)) t(a,b) \
VISUALISE a AS x, b AS y DRAW point DRAW line",
- ));
+ );
}
#[test]
fn renders_multilayer_overlay() {
// Bar + point overlay (point drawn over bar) over a shared discrete x.
- assert_png_or_skip(render(
+ assert_renders(
"SELECT g, b FROM (VALUES ('a',2),('b',4),('c',5),('d',3)) t(g,b) \
VISUALISE g AS x, b AS y DRAW bar DRAW point SETTING color => 'red'",
- ));
+ );
}
#[test]
fn renders_multilayer_abline() {
// A diagonal reference line overlaid on a scatter spans the shared
// resolved x/y domain.
- assert_png_or_skip(render(
+ assert_renders(
"SELECT * FROM (VALUES (1,2),(2,4),(3,5),(4,4),(5,7)) t(a,b) \
VISUALISE a AS x, b AS y DRAW point PLACE rule SETTING slope => 1, y => 0",
- ));
+ );
}
#[test]
fn renders_multilayer_shared_legend() {
// Two layers both colored by the same variable → one collapsed legend.
- assert_png_or_skip(render(
+ assert_renders(
"SELECT g, a, b FROM (VALUES ('p',1,2),('p',2,4),('q',3,5),('q',4,4)) t(g,a,b) \
VISUALISE a AS x, b AS y, g AS color DRAW point DRAW line",
- ));
+ );
}
#[test]
fn renders_boxplot_styled() {
- assert_png_or_skip(render(
+ assert_renders(
"SELECT g, y FROM (VALUES ('a',1),('a',5),('a',3),('a',9),('a',2), \
('b',4),('b',6),('b',5),('b',7),('b',3)) t(g, y) \
VISUALISE g AS x, y AS y, 'navy' AS stroke DRAW boxplot",
- ));
+ );
}
#[test]
fn renders_boxplot_stroke_by_group() {
// Data-mapped stroke colors every component (box/whisker/median/outlier)
// per group and registers one collapsed legend.
- assert_png_or_skip(render(
+ assert_renders(
"SELECT g, y FROM (VALUES ('a',1),('a',5),('a',3),('a',9),('a',2),('a',40), \
('b',4),('b',6),('b',5),('b',7),('b',3)) t(g, y) \
VISUALISE g AS x, y AS y, g AS stroke DRAW boxplot",
- ));
+ );
}
#[test]
fn renders_tile_sized() {
// `width`/`height` settings shrink discrete tiles within their band.
- assert_png_or_skip(render(
+ assert_renders(
"SELECT a, b, v FROM (VALUES ('x','p',1),('y','q',2),('x','q',3),('y','p',4)) t(a,b,v) \
- VISUALISE a AS x, b AS y, v AS fill DRAW tile SETTING width => 0.5, height => 0.5",
- ));
+ VISUALISE a AS x, b AS y, v AS fill DRAW tile SETTING width => 0.5, height => 0.5",);
}
#[test]
@@ -704,31 +582,31 @@ mod tests {
// banded on one axis and spanned by extents on the other.
let data =
"SELECT c, n, v FROM (VALUES ('x',1.0,1),('y',2.0,2),('x',2.0,3),('y',1.0,4)) t(c,n,v)";
- assert_png_or_skip(render(&format!(
+ assert_renders(&format!(
"{data} VISUALISE c AS x, n AS y, v AS fill DRAW tile"
- )));
- assert_png_or_skip(render(&format!(
+ ));
+ assert_renders(&format!(
"{data} VISUALISE n AS x, c AS y, v AS fill DRAW tile"
- )));
+ ));
}
#[test]
fn renders_text_keyword_justification_column() {
// A `vjust` column of keywords is read as keywords: casting it to numbers
// first would silently make every anchor NaN.
- assert_png_or_skip(render(
+ assert_renders(
"SELECT x, y, l, j FROM (VALUES (1,1,'one','top'),(2,2,'two','bottom')) t(x,y,l,j) \
VISUALISE x AS x, y AS y, l AS label, j AS vjust DRAW text",
- ));
+ );
}
#[test]
fn renders_violin() {
- assert_png_or_skip(render(
+ assert_renders(
"SELECT g, y FROM (VALUES ('a',1),('a',5),('a',3),('a',9),('a',2), \
('b',4),('b',6),('b',5),('b',7),('b',3)) t(g, y) \
VISUALISE g AS x, y AS y DRAW violin",
- ));
+ );
}
#[test]
@@ -736,37 +614,37 @@ mod tests {
// A stacked bar under polar becomes a pie: pos2 (count) → theta,
// pos1 (dummy) → radius. Includes a 180° slice, which exercises the
// wide-wedge path.
- assert_png_or_skip(render(
+ assert_renders(
"SELECT c FROM (VALUES ('a'),('a'),('a'),('b'),('b'),('c')) t(c) \
VISUALISE c AS fill DRAW bar PROJECT TO polar",
- ));
+ );
}
#[test]
fn renders_polar_donut() {
// `inner` opens a centre hole (donut).
- assert_png_or_skip(render(
+ assert_renders(
"SELECT c FROM (VALUES ('a'),('a'),('a'),('b'),('b'),('c')) t(c) \
VISUALISE c AS fill DRAW bar PROJECT TO polar SETTING inner => 0.5",
- ));
+ );
}
#[test]
fn renders_wrap_facet() {
- assert_png_or_skip(render(
+ assert_renders(
"SELECT 1 AS x, 2 AS y, 'a' AS g UNION ALL SELECT 2, 3, 'b' \
UNION ALL SELECT 3, 1, 'a' UNION ALL SELECT 4, 5, 'c' \
VISUALISE x AS x, y AS y DRAW point FACET g",
- ));
+ );
}
#[test]
fn renders_grid_facet() {
- assert_png_or_skip(render(
+ assert_renders(
"SELECT 1 AS x, 2 AS y, 'a' AS r, 'p' AS c UNION ALL SELECT 2, 3, 'b', 'p' \
UNION ALL SELECT 3, 1, 'a', 'q' UNION ALL SELECT 4, 5, 'b', 'q' \
VISUALISE x AS x, y AS y DRAW point FACET r BY c",
- ));
+ );
}
#[test]
@@ -774,52 +652,52 @@ mod tests {
// A grid whose row × column combinations are not all present: the absent
// cells are still drawn — framed, gridded, axed and strip-labelled — so the
// grid stays rectangular. `('b','q')` has no rows here.
- assert_png_or_skip(render(
+ assert_renders(
"SELECT 1 AS x, 2 AS y, 'a' AS r, 'p' AS c UNION ALL SELECT 2, 3, 'b', 'p' \
UNION ALL SELECT 3, 1, 'a', 'q' \
VISUALISE x AS x, y AS y DRAW point FACET r BY c",
- ));
+ );
}
#[test]
fn renders_sparse_grid_facet_free() {
// An empty cell has no extent of its own, so a free dimension falls back to
// the shared scale there — the axis and channel bindings must still resolve.
- assert_png_or_skip(render(
+ assert_renders(
"SELECT 1 AS x, 2 AS y, 'a' AS r, 'p' AS c UNION ALL SELECT 2, 3, 'b', 'p' \
UNION ALL SELECT 3, 1, 'a', 'q' \
VISUALISE x AS x, y AS y DRAW point FACET r BY c SETTING free => ['x','y']",
- ));
+ );
}
#[test]
fn renders_faceted_bar_with_color() {
- assert_png_or_skip(render(
+ assert_renders(
"SELECT g, k FROM (VALUES ('a','x'),('a','y'),('b','x'),('b','y'),('a','x')) t(g, k) \
VISUALISE k AS x, k AS fill DRAW bar FACET g",
- ));
+ );
}
#[test]
fn renders_free_scale_facet() {
// Panels with very different data ranges: free scales give each panel its
// own per-panel domain and axes.
- assert_png_or_skip(render(
+ assert_renders(
"SELECT x, y, g FROM (VALUES (1,1,'a'),(2,2,'a'),(3,3,'a'),\
(100,100,'b'),(200,200,'b'),(300,300,'b')) t(x,y,g) \
VISUALISE x AS x, y AS y DRAW point FACET g SETTING free => ['x','y']",
- ));
+ );
}
#[test]
fn renders_polar_facet() {
// A pie per panel, sharing the fill scale; proportions differ per panel.
- assert_png_or_skip(render(
+ assert_renders(
"SELECT c, panel FROM (VALUES \
('a','one'),('a','one'),('b','one'),('c','one'),\
('a','two'),('b','two'),('b','two'),('b','two'),('c','two')) t(c, panel) \
VISUALISE c AS fill DRAW bar PROJECT TO polar FACET panel",
- ));
+ );
}
#[cfg(feature = "spatial")]
@@ -827,13 +705,13 @@ mod tests {
fn renders_spatial() {
// A bare `spatial` geom (no PROJECT): two polygons filled by a value,
// framed to the geometry bbox under Cartesian with equal aspect.
- assert_png_or_skip(render(
+ assert_renders(
"INSTALL spatial; LOAD spatial; \
SELECT ST_GeomFromText('POLYGON ((0 0, 1 0, 1 1, 0 1, 0 0))') AS geom, \
200 AS population \
UNION ALL SELECT ST_GeomFromText('POLYGON ((1 0, 2 0, 2 1, 1 1, 1 0))'), 150 \
VISUALISE DRAW spatial MAPPING population AS fill",
- ));
+ );
}
#[cfg(feature = "spatial")]
@@ -841,13 +719,13 @@ mod tests {
fn renders_spatial_mapped_opacity() {
// A data-mapped scalar aesthetic (opacity) must vary per feature and
// register a legend, not collapse to a constant.
- assert_png_or_skip(render(
+ assert_renders(
"INSTALL spatial; LOAD spatial; \
SELECT ST_GeomFromText('POLYGON ((0 0, 1 0, 1 1, 0 1, 0 0))') AS geom, \
10 AS v \
UNION ALL SELECT ST_GeomFromText('POLYGON ((1 0, 2 0, 2 1, 1 1, 1 0))'), 90 \
VISUALISE DRAW spatial MAPPING v AS opacity",
- ));
+ );
}
#[cfg(feature = "spatial")]
@@ -855,9 +733,7 @@ mod tests {
fn renders_map() {
// A projected world map: pre-projected geometry + Custom projection
// boundary + graticules from `computed`.
- assert_png_or_skip(render(
- "VISUALISE FROM ggsql:world DRAW spatial PROJECT TO orthographic",
- ));
+ assert_renders("VISUALISE FROM ggsql:world DRAW spatial PROJECT TO orthographic");
}
/// Under a map `PROJECT`, ggsql expands these layers into per-vertex rows and
@@ -868,45 +744,45 @@ mod tests {
#[cfg(feature = "spatial")]
#[test]
fn renders_densified_segment() {
- assert_png_or_skip(render(
+ assert_renders(
"INSTALL spatial; LOAD spatial; \
SELECT * FROM (VALUES (-100,30,20,60),(-50,-20,100,10)) t(x1,y1,x2,y2) \
VISUALISE x1 AS x, y1 AS y, x2 AS xend, y2 AS yend DRAW segment \
SETTING stroke => 'firebrick', linewidth => 2 PROJECT x, y TO robinson",
- ));
+ );
}
#[cfg(feature = "spatial")]
#[test]
fn renders_densified_ribbon() {
- assert_png_or_skip(render(
+ assert_renders(
"INSTALL spatial; LOAD spatial; \
SELECT * FROM (VALUES (-160,-20,20),(-80,0,40),(0,10,50),(80,-10,30)) t(x,lo,hi) \
VISUALISE x AS x, lo AS ymin, hi AS ymax DRAW ribbon \
SETTING fill => 'steelblue' PROJECT x, y TO robinson",
- ));
+ );
}
#[cfg(feature = "spatial")]
#[test]
fn renders_densified_rule() {
// A rule spans the clip bbox, so its meridians curve with the projection.
- assert_png_or_skip(render(
+ assert_renders(
"INSTALL spatial; LOAD spatial; \
SELECT * FROM (VALUES (-100),(0),(100)) t(x) VISUALISE x AS x DRAW rule \
SETTING stroke => 'darkgreen', linetype => 'dashed' PROJECT x, y TO robinson",
- ));
+ );
}
#[cfg(feature = "spatial")]
#[test]
fn renders_densified_tile() {
- assert_png_or_skip(render(
+ assert_renders(
"INSTALL spatial; LOAD spatial; \
SELECT * FROM (VALUES (-120,-30,5),(-40,20,9),(40,-10,3)) t(x,y,v) \
VISUALISE x AS x, y AS y, v AS fill DRAW tile \
SETTING width => 40, height => 30 PROJECT x, y TO robinson",
- ));
+ );
}
#[cfg(feature = "spatial")]
@@ -914,7 +790,7 @@ mod tests {
fn renders_map_over_spatial_base() {
// A non-spatial layer over a spatial base map: both must frame to ggsql's
// bbox so the segments land on the boundary, not on their own extent.
- assert_png_or_skip(render(
+ assert_renders(
"WITH routes AS (SELECT * FROM (VALUES (-74,40,2,48,'a'),(151,-34,18,-34,'b')) \
t(x1,y1,x2,y2,route)) \
VISUALISE \
@@ -922,7 +798,7 @@ mod tests {
DRAW segment MAPPING x1 AS x, y1 AS y, x2 AS xend, y2 AS yend, route AS stroke \
FROM routes \
PROJECT x, y TO robinson",
- ));
+ );
}
/// A 6-row fixture whose `g` is categorical and `v` numeric.
@@ -1149,253 +1025,253 @@ mod tests {
#[test]
fn renders_binned_facet() {
- assert_png_or_skip(render(&format!(
+ assert_renders(&format!(
"{FACET_DATA} VISUALISE v AS x, y AS y DRAW point FACET v \
SCALE panel SETTING breaks => (0, 10, 20, 30)"
- )));
+ ));
}
#[test]
fn renders_free_binned_facet() {
// A free binned position dimension: each panel keeps ggsql's global bin
// edges but shows only the bins its own data occupies.
- assert_png_or_skip(render(
+ assert_renders(
"VISUALISE body_mass AS x FROM ggsql:penguins DRAW bar \
SCALE BINNED x SETTING breaks => (2500, 3500, 4500, 5500, 6500) \
FACET species SETTING free => 'x'",
- ));
+ );
}
#[test]
fn renders_binned_size_legend() {
// A binned *keyed* legend: one key per bin, sized at the bin's midpoint,
// with ggsql's edge labels on the rail between keys.
- assert_png_or_skip(render(
+ assert_renders(
"VISUALISE bill_len AS x, bill_dep AS y, body_mass AS size \
FROM ggsql:penguins DRAW point \
SCALE BINNED size SETTING breaks => (2500, 3500, 4500, 5500, 6500)",
- ));
+ );
}
#[test]
fn renders_binned_color_legend() {
// The same ladder driving color: a stepped colorbar, one block per bin.
- assert_png_or_skip(render(
+ assert_renders(
"VISUALISE bill_len AS x, bill_dep AS y, body_mass AS color \
FROM ggsql:penguins DRAW point \
SCALE BINNED color SETTING breaks => (2500, 3500, 4500, 5500, 6500)",
- ));
+ );
}
#[test]
fn renders_boxplot_linewidth() {
// `linewidth` thickens box, whiskers and median alike (VL puts
// strokeWidth in the boxplot's shared encoding).
- assert_png_or_skip(render(
+ assert_renders(
"SELECT g, v FROM (VALUES ('a',1),('a',2),('a',3),('a',9),\
('b',2),('b',3),('b',4),('b',5)) t(g,v) \
VISUALISE g AS x, v AS y DRAW boxplot SETTING linewidth => 3",
- ));
+ );
}
#[test]
fn renders_boxplot_dashed() {
- assert_png_or_skip(render(
+ assert_renders(
"SELECT g, v FROM (VALUES ('a',1),('a',2),('a',3),('b',2),('b',3),('b',5)) t(g,v) \
VISUALISE g AS x, v AS y DRAW boxplot \
SETTING linetype => 'dashed', linewidth => 2",
- ));
+ );
}
#[test]
fn renders_boxplot_hinge() {
// `hinge` caps the whiskers with a fixed-size (pt) tick at each fence.
- assert_png_or_skip(render(
+ assert_renders(
"SELECT g, v FROM (VALUES ('a',1),('a',2),('a',3),('a',9),\
('b',2),('b',3),('b',4),('b',5)) t(g,v) \
VISUALISE g AS x, v AS y DRAW boxplot SETTING hinge => 20",
- ));
+ );
}
#[test]
fn renders_boxplot_side() {
// `side` halves the box, median and caps onto one side of the band,
// leaving whiskers and outliers on the centreline.
- assert_png_or_skip(render(
+ assert_renders(
"SELECT g, v FROM (VALUES ('a',1),('a',2),('a',3),('a',9),\
('b',2),('b',3),('b',4),('b',5)) t(g,v) \
VISUALISE g AS x, v AS y DRAW boxplot \
SETTING side => 'right', hinge => 20",
- ));
+ );
}
#[test]
fn renders_transposed_boxplot() {
// A horizontal boxplot: ggsql flips the position columns, so the
// categories are on `pos2` and the summary values in the `pos1` family.
- assert_png_or_skip(render(
+ assert_renders(
"SELECT g, v FROM (VALUES ('a',1),('a',2),('a',3),('a',9),\
('b',2),('b',3),('b',4),('b',5)) t(g,v) \
VISUALISE v AS x, g AS y DRAW boxplot SETTING hinge => 15",
- ));
+ );
}
#[test]
fn renders_half_violin_with_half_boxplot() {
// Opposite `side` values pair the two composites on one band, the
// documented raincloud-style layout (transposed, so top/bottom).
- assert_png_or_skip(render(
+ assert_renders(
"SELECT g, v FROM (VALUES ('a',1),('a',2),('a',2),('a',3),('a',4),\
('b',2),('b',3),('b',3),('b',4),('b',6)) t(g,v) \
VISUALISE v AS x, g AS y \
DRAW violin SETTING side => 'top' \
DRAW boxplot SETTING side => 'bottom', width => 0.3",
- ));
+ );
}
#[test]
fn renders_jittered_points() {
// `position => 'jitter'` spreads the points across their category band;
// `side` (folded into the offsets by ggsql) keeps them on one half.
- assert_png_or_skip(render(
+ assert_renders(
"VISUALISE species AS x, bill_len AS y FROM ggsql:penguins DRAW point \
SETTING position => 'jitter'",
- ));
- assert_png_or_skip(render(
+ );
+ assert_renders(
"VISUALISE species AS x, bill_len AS y FROM ggsql:penguins DRAW point \
SETTING position => 'jitter', side => 'right'",
- ));
+ );
}
#[test]
fn renders_dodged_points() {
// Dodge on a geom that doesn't derive its own band edges: the offsets
// reach the point's band channel.
- assert_png_or_skip(render(
+ assert_renders(
"SELECT x, g, v FROM (VALUES ('a','p',3),('a','q',5),('b','p',2),('b','q',4)) \
t(x,g,v) \
VISUALISE x AS x, v AS y, g AS color DRAW point SETTING position => 'dodge'",
- ));
+ );
}
#[test]
fn renders_dodged_range_with_hinges() {
// A dodged interval and its end caps share one offset, so they stay
// aligned in the dodge slot.
- assert_png_or_skip(render(
+ assert_renders(
"SELECT g, s, lo, hi FROM (VALUES ('a','p',1,5),('a','q',2,6),('b','p',2,7)) \
t(g,s,lo,hi) \
VISUALISE g AS x, lo AS ymin, hi AS ymax, s AS stroke DRAW range \
SETTING position => 'dodge'",
- ));
+ );
}
#[test]
fn renders_jitter_with_half_boxplot() {
// The documented raincloud layout: a one-sided jitter above the
// centreline, a half-boxplot below it.
- assert_png_or_skip(render(
+ assert_renders(
"VISUALISE bill_len AS x, species AS y FROM ggsql:penguins \
DRAW point SETTING position => 'jitter', side => 'top', width => 0.4 \
DRAW boxplot SETTING side => 'bottom', width => 0.4",
- ));
+ );
}
#[test]
fn renders_range_hinges() {
// A range carries 10pt end caps by default; `hinge => null` drops them.
- assert_png_or_skip(render(
+ assert_renders(
"SELECT g, lo, hi FROM (VALUES ('a',1,5),('b',2,7)) t(g,lo,hi) \
VISUALISE g AS x, lo AS ymin, hi AS ymax DRAW range",
- ));
- assert_png_or_skip(render(
+ );
+ assert_renders(
"SELECT g, lo, hi FROM (VALUES ('a',1,5),('b',2,7)) t(g,lo,hi) \
VISUALISE g AS y, lo AS xmin, hi AS xmax DRAW range \
SETTING hinge => 40",
- ));
- assert_png_or_skip(render(
+ );
+ assert_renders(
"SELECT g, lo, hi FROM (VALUES ('a',1,5),('b',2,7)) t(g,lo,hi) \
VISUALISE g AS x, lo AS ymin, hi AS ymax DRAW range \
SETTING hinge => null",
- ));
+ );
}
#[test]
fn renders_violin_linewidth() {
- assert_png_or_skip(render(
+ assert_renders(
"SELECT g, v FROM (VALUES ('a',1),('a',2),('a',2),('a',3),('a',4),\
('b',2),('b',3),('b',3),('b',4),('b',6)) t(g,v) \
VISUALISE g AS x, v AS y DRAW violin \
SETTING linewidth => 3, linetype => 'dashed'",
- ));
+ );
}
#[test]
fn renders_dodged_violin() {
// Two fill groups per category: each must be its own contour (keyed on the
// category *and* the partition columns), not one merged blob.
- assert_png_or_skip(render(
+ assert_renders(
"SELECT g, f, v FROM (VALUES ('a','x',1),('a','x',2),('a','x',3),\
('a','y',5),('a','y',6),('a','y',7),\
('b','x',2),('b','x',3),('b','x',4),('b','y',6),('b','y',7),('b','y',8)) t(g,f,v) \
VISUALISE g AS x, v AS y, f AS fill DRAW violin",
- ));
+ );
}
#[test]
fn renders_text_stroke() {
// A constant `stroke` outlines the glyphs; white-on-dark legibility.
- assert_png_or_skip(render(
+ assert_renders(
"SELECT 1 AS x, 2 AS y, 'peak' AS lbl UNION ALL SELECT 2, 3, 'trough' \
VISUALISE x AS x, y AS y, lbl AS label DRAW text \
SETTING fontsize => 28, fontweight => 'bold', color => 'black', \
stroke => 'white'",
- ));
+ );
}
#[test]
fn renders_text_stroke_by_group() {
// A data-mapped outline color: one scale + legend, per-row outline.
- assert_png_or_skip(render(
+ assert_renders(
"SELECT 1 AS x, 2 AS y, 'a' AS lbl, 'one' AS g \
UNION ALL SELECT 2, 3, 'b', 'two' \
VISUALISE x AS x, y AS y, lbl AS label, g AS stroke DRAW text \
SETTING fontsize => 30, fontweight => 'bold'",
- ));
+ );
}
#[test]
fn renders_titled_plot() {
// Title, subtitle and caption all sit on the composition, above/below the
// single panel.
- assert_png_or_skip(render(
+ assert_renders(
"SELECT 1 AS x, 2 AS y UNION ALL SELECT 2, 3 UNION ALL SELECT 3, 1 \
VISUALISE x AS x, y AS y DRAW point \
LABEL title => 'Sales by Region', subtitle => 'FY 2024', \
caption => 'Source: internal'",
- ));
+ );
}
#[test]
fn renders_suppressed_title() {
// `LABEL title => NULL` suppresses; the subtitle still renders.
- assert_png_or_skip(render(
+ assert_renders(
"SELECT 1 AS x, 2 AS y UNION ALL SELECT 2, 3 \
VISUALISE x AS x, y AS y DRAW point \
LABEL title => NULL, subtitle => 'no title above me'",
- ));
+ );
}
#[test]
fn renders_titled_facet() {
// One composition-spanning title over the whole 3-panel strip, not one
// title per panel.
- assert_png_or_skip(render(
+ assert_renders(
"SELECT x, y, g FROM (VALUES (1,1,'a'),(2,2,'a'),(1,2,'b'),(2,3,'b'),\
(1,3,'c'),(2,1,'c')) t(x,y,g) \
VISUALISE x AS x, y AS y DRAW point FACET g \
LABEL title => 'One title for all panels'",
- ));
+ );
}
#[test]
@@ -1416,19 +1292,568 @@ mod tests {
assert_eq!(*r.end(), 3.5);
}
+ /// The one geom no renderer-backed writer draws. `arrow` is a stub — the
+ /// Vega-Lite writer has no implementation either and none is intended — so
+ /// this is a guard against a stub rather than a fallback path, and it lives
+ /// in the shared composition layer rather than in any writer.
#[test]
fn rejects_unsupported_geom() {
+ let spec = spec_for(
+ "SELECT 0 AS x, 0 AS y, 1 AS xend, 1 AS yend \
+ VISUALISE x AS x, y AS y, xend AS xend, yend AS yend DRAW arrow",
+ );
+ let err = compose::validate_plot(spec.plot()).unwrap_err();
+ assert!(matches!(err, GgsqlError::WriterError(_)));
+ assert!(err.to_string().contains("'arrow' geom"), "{err}");
+ }
+}
+
+// The assertions no raster test can make.
+//
+// SVG output is readable text, so these check the writer's governing principle
+// *directly*: that the breaks, labels and titles ggsql resolved are the ones
+// that reach the output, rather than something the renderer worked out for
+// itself. A PNG can only ever say "some pixels were produced".
+//
+// None of it needs a GPU, so all of it runs in CI.
+#[cfg(all(test, feature = "duckdb", feature = "svg"))]
+mod svg_text {
+ use super::*;
+ use crate::reader::{DuckDBReader, Reader};
+ use crate::writer::{Writer, WriterOptions};
+
+ const FACET_DATA: &str = "SELECT g, v, y FROM (VALUES \
+ ('a',5,1),('a',7,2),('b',15,3),('b',18,1),('c',25,2),('c',28,3)) t(g,v,y)";
+
+ fn svg(query: &str) -> String {
+ let reader = DuckDBReader::from_connection_string("duckdb://memory").unwrap();
+ let spec = reader.execute(query).unwrap();
+ let (svg, warnings) = SvgWriter::new(640, 480, 96.0)
+ .render_reporting(&spec)
+ .unwrap_or_else(|e| panic!("svg render failed: {e}"));
+ assert!(warnings.is_empty(), "svg degraded the plot: {warnings:?}");
+ svg
+ }
+
+ /// Every `` element's text, in document order.
+ ///
+ /// A run of styled spans is one string, so a markdown-emphasised title
+ /// reads as the sentence a user typed rather than as its pieces.
+ fn texts(svg: &str) -> Vec {
+ let mut out = Vec::new();
+ let mut rest = svg;
+ while let Some(open) = rest.find("") else {
+ break;
+ };
+ let element = &rest[..end];
+ let mut label = String::new();
+ let mut span = element;
+ while let Some(at) = span.find("') else { break };
+ let Some(close) = span.find(" ") else {
+ break;
+ };
+ label.push_str(&span[gt + 1..close]);
+ span = &span[close..];
+ }
+ out.push(label);
+ rest = &rest[end..];
+ }
+ out
+ }
+
+ fn contains(svg: &str, label: &str) -> bool {
+ texts(svg).iter().any(|t| t == label)
+ }
+
+ #[test]
+ fn tick_labels_are_the_ones_ggsql_resolved() {
+ // Both axes, at ggsql's own break spacing and in ggsql's own number
+ // formatting — the trailing `.0` on one axis and not the other is the
+ // giveaway that these are pass-throughs rather than the renderer's own
+ // idea of a nice tick.
+ let linear = svg("SELECT x, y FROM (VALUES (1,2),(2,3),(3,1)) t(x,y) \
+ VISUALISE x AS x, y AS y DRAW point");
+ for label in ["1.0", "1.5", "2.0", "2.5", "3.0"] {
+ assert!(contains(&linear, label), "missing tick '{label}'");
+ }
+
+ // A `RENAMING` on a discrete axis reaches the rail, and the axis does
+ // not shift: the break is kept and only its label replaced.
+ let renamed = svg("SELECT c, v FROM (VALUES ('a',3),('b',5)) t(c,v) \
+ VISUALISE c AS x, v AS y DRAW bar SCALE x RENAMING 'a' => 'Alpha'");
+ assert!(contains(&renamed, "Alpha"));
+ assert!(contains(&renamed, "b"));
+ }
+
+ /// A log axis should carry decade ticks. It carries denormal garbage
+ /// instead — but that is **ggsql's scale resolution, not this writer**:
+ /// `Scale::numeric_breaks()` comes back as `[5e-308, 2e-256, …, 100]` for
+ /// a 1–100 log10 domain, and the Vega-Lite writer emits the same labels
+ /// from the same resolved values.
+ ///
+ /// Left as a failing expectation rather than as prose so it turns green on
+ /// its own when the scale is fixed. Nothing in the writer changes then —
+ /// the labels already pass straight through.
+ #[test]
+ #[ignore = "ggsql resolves log-scale breaks to denormals; not a writer bug"]
+ fn log_tick_labels_should_be_decades() {
+ let log = svg("SELECT x, y FROM (VALUES (1,2),(10,3),(100,1)) t(x,y) \
+ VISUALISE x AS x, y AS y DRAW point SCALE x VIA log");
+ for label in ["1", "10", "100"] {
+ assert!(contains(&log, label), "missing log tick '{label}'");
+ }
+ }
+
+ #[test]
+ fn a_binned_scales_edge_labels_reach_the_legend() {
+ // ggsql resolves the bin ladder; the renderer has no way to derive
+ // those edges, so finding all five verbatim on the colorbar rail is
+ // the pass-through.
+ let binned = svg(
+ "VISUALISE bill_len AS x, bill_dep AS y, body_mass AS color \
+ FROM ggsql:penguins DRAW point \
+ SCALE BINNED color SETTING breaks => (2500, 3500, 4500, 5500, 6500)",
+ );
+ for label in ["2500", "3500", "4500", "5500", "6500"] {
+ assert!(contains(&binned, label), "missing bin edge '{label}'");
+ }
+ }
+
+ #[test]
+ fn facet_strip_labels_appear_once_each_in_panel_order() {
+ let faceted = svg(&format!(
+ "{FACET_DATA} VISUALISE v AS x, y AS y DRAW point FACET g"
+ ));
+ let labels = texts(&faceted);
+ for level in ["a", "b", "c"] {
+ assert_eq!(
+ labels.iter().filter(|t| *t == level).count(),
+ 1,
+ "strip '{level}' should appear exactly once in {labels:?}"
+ );
+ }
+ // In panel order, which is the facet scale's resolved order.
+ let order: Vec<&String> = labels
+ .iter()
+ .filter(|t| ["a", "b", "c"].contains(&t.as_str()))
+ .collect();
+ assert_eq!(order, vec!["a", "b", "c"]);
+
+ // And `RENAMING` reaches the strip, since the label is ggsql's.
+ let renamed = svg(&format!(
+ "{FACET_DATA} VISUALISE v AS x, y AS y DRAW point FACET g \
+ SCALE panel RENAMING 'a' => 'Alpha'"
+ ));
+ assert!(contains(&renamed, "Alpha"));
+ assert!(!contains(&renamed, "a"));
+ }
+
+ #[test]
+ fn binned_facet_strips_show_ggsqls_range_labels() {
+ let binned = svg(&format!(
+ "{FACET_DATA} VISUALISE v AS x, y AS y DRAW point FACET v \
+ SCALE panel SETTING breaks => (0, 10, 20, 30)"
+ ));
+ for label in ["0 – 10", "10 – 20", "20 – 30"] {
+ assert!(contains(&binned, label), "missing strip '{label}'");
+ }
+ }
+
+ #[test]
+ fn every_plot_label_reaches_the_output() {
+ let labelled = svg("SELECT x, y FROM (VALUES (1,2),(2,3)) t(x,y) \
+ VISUALISE x AS x, y AS y DRAW point \
+ LABEL title => 'The title', subtitle => 'The subtitle', \
+ caption => 'The caption', x => 'Across', y => 'Up'");
+ for label in ["The title", "The subtitle", "The caption", "Across", "Up"] {
+ assert!(contains(&labelled, label), "missing label '{label}'");
+ }
+ }
+
+ #[test]
+ fn markdown_in_a_label_is_parsed_rather_than_printed() {
+ let emphasised = svg("SELECT x, y FROM (VALUES (1,2),(2,3)) t(x,y) \
+ VISUALISE x AS x, y AS y DRAW point LABEL title => 'A *bold* title'");
+ // The words survive, the markers do not.
+ assert!(contains(&emphasised, "A bold title"));
+ assert!(
+ !texts(&emphasised).iter().any(|t| t.contains('*')),
+ "a literal '*' means the markdown was not parsed"
+ );
+ // And the emphasised run is styled, not merely re-joined.
+ assert!(
+ emphasised.contains("font-style=\"italic\""),
+ "the emphasised span carries no style"
+ );
+ }
+
+ #[test]
+ fn a_legends_title_and_key_labels_appear() {
+ // The title is the mapped column, and the keys are the categorical
+ // domain ggsql trained, in its resolved order.
+ let keyed = svg(
+ "SELECT x, y, g FROM (VALUES (1,2,'alpha'),(2,3,'beta'),(3,1,'alpha')) t(x,y,g) \
+ VISUALISE x AS x, y AS y, g AS color DRAW point",
+ );
+ for label in ["g", "alpha", "beta"] {
+ assert!(contains(&keyed, label), "missing legend text '{label}'");
+ }
+
+ // `RENAMING` relabels a key without dropping the others.
+ let renamed = svg(
+ "SELECT x, y, g FROM (VALUES (1,2,'alpha'),(2,3,'beta'),(3,1,'alpha')) t(x,y,g) \
+ VISUALISE x AS x, y AS y, g AS color DRAW point \
+ SCALE color RENAMING 'alpha' => 'First'",
+ );
+ assert!(contains(&renamed, "First"));
+ assert!(contains(&renamed, "beta"));
+ assert!(!contains(&renamed, "alpha"));
+ }
+
+ #[test]
+ fn outline_mode_turns_text_into_paths() {
+ let query = "SELECT x, y FROM (VALUES (1,2),(2,3)) t(x,y) \
+ VISUALISE x AS x, y AS y DRAW point LABEL title => 'Outlined'";
+ let reader = DuckDBReader::from_connection_string("duckdb://memory").unwrap();
+ let spec = reader.execute(query).unwrap();
+
+ let as_text = SvgWriter::new(640, 480, 96.0).render(&spec).unwrap();
+ let as_paths = SvgWriter::new(640, 480, 96.0)
+ .outline_text(true)
+ .render(&spec)
+ .unwrap();
+
+ assert!(as_text.contains("");
+ assert!(
+ !as_paths.contains(""
+ );
+ assert!(
+ as_paths.matches(" as_text.matches(" crate::reader::Spec {
+ let reader = DuckDBReader::from_connection_string("duckdb://memory").unwrap();
+ reader
.execute(
- "SELECT 0 AS x, 0 AS y, 1 AS xend, 1 AS yend \
- VISUALISE x AS x, y AS y, xend AS xend, yend AS yend DRAW arrow",
+ "SELECT x, y FROM (VALUES (1,2),(2,3),(3,1)) t(x,y) \
+ VISUALISE x AS x, y AS y DRAW point LABEL title => 'A page'",
)
+ .unwrap()
+ }
+
+ #[test]
+ fn the_page_box_is_the_canvas_at_seventy_two_points_per_inch() {
+ // 640 px at 96 dpi is 6⅔ in, which is 480 pt; 480 px is 360 pt.
+ let pdf = PdfWriter::new(640, 480, 96.0)
+ .compress(false)
+ .render(&spec())
.unwrap();
- let writer = PngWriter::new(320, 240, 96.0);
- assert!(matches!(
- writer.validate(spec.plot()),
- Err(GgsqlError::WriterError(_))
- ));
+ let text = String::from_utf8_lossy(&pdf);
+ assert!(
+ text.contains("/MediaBox [0 0 480 360]"),
+ "unexpected page box"
+ );
+ }
+
+ #[test]
+ fn an_uncompressed_page_is_readable_and_a_compressed_one_is_smaller() {
+ let readable = PdfWriter::new(640, 480, 96.0)
+ .compress(false)
+ .render(&spec())
+ .unwrap();
+ let compressed = PdfWriter::new(640, 480, 96.0).render(&spec()).unwrap();
+
+ assert!(readable.starts_with(b"%PDF-"));
+ assert!(compressed.starts_with(b"%PDF-"));
+ // `compress=false` exists so a user can read or diff the stream.
+ assert!(!String::from_utf8_lossy(&readable).contains("/FlateDecode"));
+ assert!(String::from_utf8_lossy(&compressed).contains("/FlateDecode"));
+ assert!(compressed.len() < readable.len());
+ }
+
+ #[test]
+ fn a_font_is_subset_into_the_page() {
+ // The page must carry its own glyphs, or a figure in a paper renders
+ // in whatever the reader substitutes.
+ let pdf = PdfWriter::new(640, 480, 96.0)
+ .compress(false)
+ .render(&spec())
+ .unwrap();
+ let text = String::from_utf8_lossy(&pdf);
+ assert!(text.contains("/FontFile2"), "no embedded font programme");
+ assert!(text.contains("/Type /Font"));
+ }
+}
+
+#[cfg(all(test, feature = "duckdb", feature = "svg"))]
+mod svg_probe2 {
+ use crate::reader::{DuckDBReader, Reader};
+
+ fn breaks(tag: &str, query: &str) {
+ let reader = DuckDBReader::from_connection_string("duckdb://memory").unwrap();
+ let spec = reader.execute(query).unwrap();
+ for scale in &spec.plot().scales {
+ eprintln!(
+ "### {tag} {} type={:?} transform={:?}\n breaks={:?}\n labels={:?}",
+ scale.aesthetic,
+ scale.scale_type,
+ scale.transform,
+ scale.numeric_breaks(),
+ scale.break_labels()
+ );
+ }
+ }
+
+ #[test]
+ #[ignore]
+ fn probe() {
+ breaks("linear", "SELECT x, y FROM (VALUES (1,2),(10,3),(100,1)) t(x,y) VISUALISE x AS x, y AS y DRAW point");
+ breaks("log", "SELECT x, y FROM (VALUES (1,2),(10,3),(100,1)) t(x,y) VISUALISE x AS x, y AS y DRAW point SCALE x VIA log");
+ }
+}
+
+// The `hep` round trip.
+//
+// A document is written from a live composition, read back into a *new* one,
+// and both are rendered to SVG and compared byte for byte. That single
+// assertion covers the whole format — every scale, break, label, theme entry,
+// channel column and geom the plot carries has to survive, because any loss
+// shows up as different drawing commands.
+//
+// SVG is the comparison surface precisely because it is deterministic text: a
+// rasterised comparison would be at the mercy of GPU antialiasing, which is not
+// bit-reproducible even between two runs of the same code.
+//
+// Behind the test-only `hep-read` feature — the shipped library only writes.
+#[cfg(all(
+ test,
+ feature = "duckdb",
+ feature = "hep-read",
+ feature = "svg",
+ feature = "builtin-data"
+))]
+mod hep_roundtrip {
+ use super::*;
+ use crate::reader::{DuckDBReader, Reader};
+ // The round trip drives the format directly rather than only through the
+ // writer, so that a loss shows up as different drawing commands rather
+ // than as a difference in how the writer was configured.
+ use hephaestus::document::{
+ read_composition, read_hints, unsupported_items_for, write_composition, ReadContext,
+ WriteOptions,
+ };
+
+ /// Deliberately broad: several geoms, a facet, a legend, markdown chrome,
+ /// and a transform — so the round trip is not proved on a scatter plot.
+ const QUERIES: &[(&str, &str)] = &[
+ (
+ "faceted scatter with a legend",
+ "VISUALISE bill_len AS x, bill_dep AS y, species AS color \
+ FROM ggsql:penguins DRAW point FACET island \
+ LABEL title => 'Penguin *bills*', caption => 'From ggsql:penguins'",
+ ),
+ (
+ "multi-layer with a colorbar",
+ "VISUALISE bill_len AS x, bill_dep AS y, body_mass AS color \
+ FROM ggsql:penguins DRAW point DRAW line",
+ ),
+ (
+ "boxplot with a free facet",
+ "VISUALISE species AS x, body_mass AS y, species AS fill \
+ FROM ggsql:penguins DRAW boxplot FACET island \
+ SETTING free => ('y')",
+ ),
+ ];
+
+ fn compose_for(query: &str) -> hephaestus::plot::PlotComposition {
+ let reader = DuckDBReader::from_connection_string("duckdb://memory").unwrap();
+ let spec = reader.execute(query).unwrap();
+ compose::validate_plot(spec.plot()).unwrap();
+ compose::build_composition(spec.plot(), spec.data()).unwrap()
+ }
+
+ fn to_svg(view: &mut hephaestus::plot::PlotComposition) -> String {
+ use hephaestus::geometry::Size;
+ use hephaestus::svg::{encode_svg, SvgScene};
+ let size = Size::new(640.0, 480.0);
+ let mut scene = SvgScene::new(size, 96.0);
+ view.render(&mut scene, size, 96.0);
+ assert!(
+ scene.warnings().is_empty(),
+ "svg degraded the plot: {:?}",
+ scene.warnings()
+ );
+ encode_svg(&scene)
+ }
+
+ #[test]
+ fn a_document_rebuilds_the_plot_it_captured() {
+ for (label, query) in QUERIES {
+ let mut live = compose_for(query);
+ let bytes = write_composition(&live, &WriteOptions::default())
+ .unwrap_or_else(|e| panic!("{label}: write failed: {e}"));
+ let mut rebuilt = read_composition(&bytes, ReadContext::builtin())
+ .unwrap_or_else(|e| panic!("{label}: read failed: {e}"));
+
+ assert_eq!(
+ to_svg(&mut rebuilt),
+ to_svg(&mut live),
+ "{label}: the rebuilt composition draws differently"
+ );
+ }
+ }
+
+ /// A plot under a non-Cartesian projection. The document carries the
+ /// projection correctly, but **reading one back panics**: the decoder calls
+ /// `add_axis` before it restores the projection, so a polar axis is
+ /// validated against the default Cartesian and rejected —
+ /// `axis placement PolarAngular(Outer) is incompatible with projection
+ /// Cartesian`.
+ ///
+ /// Upstream, in the renderer's own decoder, and fixable without a wire
+ /// change: the axes are already read into a `Vec` before being added, so
+ /// applying the projection first is enough. Nothing in this writer changes
+ /// when it lands.
+ ///
+ /// Kept as an ignored test rather than as prose so it turns green on its
+ /// own — and so the polar case is not quietly missing from the round trip.
+ #[test]
+ #[ignore = "the renderer's document decoder adds axes before restoring the projection"]
+ fn a_polar_document_rebuilds_too() {
+ let query = "SELECT c FROM (VALUES ('a'),('a'),('a'),('b'),('b'),('c')) t(c) \
+ VISUALISE c AS fill DRAW bar PROJECT TO polar";
+ let mut live = compose_for(query);
+ let bytes = write_composition(&live, &WriteOptions::default()).unwrap();
+ let mut rebuilt = read_composition(&bytes, ReadContext::builtin()).unwrap();
+ assert_eq!(to_svg(&mut rebuilt), to_svg(&mut live));
+ }
+
+ #[test]
+ fn nothing_ggsql_draws_is_beyond_the_format() {
+ // The writer registers only built-in geoms and labels its scales with
+ // resolved break labels rather than formatter closures, so this should
+ // hold across the corpus. A failure means the writer grew something
+ // the format cannot name.
+ for (label, query) in QUERIES {
+ let view = compose_for(query);
+ let problems = unsupported_items_for(&view, &WriteOptions::default());
+ assert!(problems.is_empty(), "{label}: {problems:?}");
+ }
+ }
+
+ #[test]
+ fn the_writers_hints_travel_with_the_document() {
+ let spec = {
+ let reader = DuckDBReader::from_connection_string("duckdb://memory").unwrap();
+ reader.execute(QUERIES[0].1).unwrap()
+ };
+ let (bytes, warnings) = HepWriter::new(1600, 900, 150.0)
+ .background(rgba(0.0, 0.0, 0.0, 1.0))
+ .render_reporting(&spec)
+ .unwrap();
+ assert!(warnings.is_empty(), "{warnings:?}");
+ assert!(bytes.starts_with(b"HEPHPLOT"), "missing the format's magic");
+
+ let hints = read_hints(&bytes).unwrap();
+ assert_eq!(hints.size, Some((1600.0, 900.0)));
+ assert_eq!(hints.dpi, Some(150.0));
+ assert_eq!(
+ hints.background.map(|c| c.components),
+ Some([0.0, 0.0, 0.0, 1.0])
+ );
+ }
+
+ #[test]
+ fn a_document_survives_a_render_at_a_different_size() {
+ // The whole point of the format: the consumer picks the size, and the
+ // composition re-solves its layout for it.
+ use hephaestus::geometry::Size;
+ use hephaestus::svg::{encode_svg, SvgScene};
+
+ let live = compose_for(QUERIES[0].1);
+ let bytes = write_composition(&live, &WriteOptions::default()).unwrap();
+ let mut rebuilt = read_composition(&bytes, ReadContext::builtin()).unwrap();
+
+ for size in [Size::new(320.0, 240.0), Size::new(1600.0, 900.0)] {
+ let mut scene = SvgScene::new(size, 96.0);
+ rebuilt.render(&mut scene, size, 96.0);
+ let svg = encode_svg(&scene);
+ assert!(svg.contains(&format!("viewBox=\"0 0 {} {}\"", size.width, size.height)));
+ assert!(svg.matches(" 0);
+ }
}
}
diff --git a/src/writer/hephaestus/pdf.rs b/src/writer/hephaestus/pdf.rs
new file mode 100644
index 00000000..f761aafc
--- /dev/null
+++ b/src/writer/hephaestus/pdf.rs
@@ -0,0 +1,239 @@
+//! The PDF writer.
+
+use std::collections::HashMap;
+
+use hephaestus::pdf::{encode_pdf, PdfConfig, PdfScene, PdfWarning};
+
+use super::canvas::Canvas;
+use super::{compose, vector};
+use crate::writer::{Writer, WriterOptions};
+use crate::{DataFrame, Plot, Result};
+
+/// Option keys [`PdfWriter`] adds to the shared canvas set.
+const PDF_OPTIONS: &[&str] = &["compress", "links"];
+
+/// Writer that renders a ggsql plot to a PDF page.
+///
+/// Needs **no GPU adapter** — like the SVG writer, it records the same drawing
+/// commands the rasteriser would have executed. The page carries vector
+/// geometry and subset-embedded fonts, so a figure placed in a paper or a
+/// report scales and prints without resampling, and its text stays selectable.
+///
+/// [`PdfWriter::from_options`] takes:
+///
+/// | Option | Value | Default |
+/// | --- | --- | --- |
+/// | `width` | Canvas width, in `units` | 1500 px |
+/// | `height` | Canvas height, in `units` | 1000 px |
+/// | `units` | `px`, `in`, `cm`, `mm`, or `pt` — how `width`/`height` are read | `px` |
+/// | `dpi` | Pixels per inch; converts physical sizes, including `units` | 300 |
+/// | `background` | Any CSS color; `transparent` leaves the page unpainted | `white` |
+/// | `compress` | Deflate the content streams | `true` |
+/// | `links` | Emit link annotations for text carrying a destination | `true` |
+///
+/// The page box is derived from the canvas at 72 points per inch, so
+/// `width=6;height=4;units=in;dpi=300` produces a 432×288 pt page — six inches
+/// wide on paper — from an 1800×1200 rendering. `units=px` gives a page sized
+/// as if those pixels were rendered at `dpi`.
+///
+/// `compress=false` leaves the content stream as readable text, which is how
+/// you inspect what was emitted or diff two figures.
+#[derive(Debug, Clone, Copy, PartialEq)]
+pub struct PdfWriter {
+ canvas: Canvas,
+ compress: bool,
+ links: bool,
+}
+
+impl PdfWriter {
+ /// Create a writer for the given pixel dimensions and DPI, white background.
+ pub fn new(width: u32, height: u32, dpi: f64) -> Self {
+ Self {
+ canvas: Canvas::new(width, height, dpi),
+ ..Self::default()
+ }
+ }
+
+ /// Set the background painted behind the plot.
+ ///
+ /// A fully transparent color leaves the page unpainted rather than adding a
+ /// full-page rect in transparent black.
+ pub fn background(mut self, color: super::Color) -> Self {
+ self.canvas = self.canvas.background(color);
+ self
+ }
+
+ /// Deflate the content streams. On by default; off leaves them readable.
+ pub fn compress(mut self, compress: bool) -> Self {
+ self.compress = compress;
+ self
+ }
+
+ /// Emit link annotations for text carrying a destination.
+ pub fn links(mut self, links: bool) -> Self {
+ self.links = links;
+ self
+ }
+
+ /// Render, reporting anything PDF could not express.
+ ///
+ /// [`Writer::write`] discards the report. Take it when the output is an
+ /// artifact someone will ship: a dropped gradient is a defect in the file,
+ /// not a detail of how it was made. The list is empty for everything ggsql
+ /// itself draws.
+ ///
+ /// # Errors
+ ///
+ /// Returns `GgsqlError::WriterError` if the plot cannot be composed.
+ pub fn write_reporting(
+ &self,
+ spec: &Plot,
+ data: &HashMap,
+ ) -> Result<(Vec, Vec)> {
+ let mut scene = PdfScene::with_config(self.canvas.size(), self.canvas.dpi, self.config());
+ vector::draw(spec, data, &self.canvas, &mut scene)?;
+ Ok((encode_pdf(&scene), describe(scene.warnings())))
+ }
+
+ /// [`Self::write_reporting`] from a resolved `Spec`.
+ ///
+ /// # Errors
+ ///
+ /// As [`Self::write_reporting`].
+ pub fn render_reporting(&self, spec: &crate::reader::Spec) -> Result<(Vec, Vec)> {
+ self.write_reporting(spec.plot(), spec.data())
+ }
+
+ /// The emission options this writer's settings amount to.
+ fn config(&self) -> PdfConfig {
+ PdfConfig::new()
+ .background(self.canvas.vector_background())
+ .compress(self.compress)
+ .links(self.links)
+ }
+}
+
+impl Default for PdfWriter {
+ fn default() -> Self {
+ Self {
+ canvas: Canvas::default(),
+ compress: true,
+ links: true,
+ }
+ }
+}
+
+impl Writer for PdfWriter {
+ type Output = Vec;
+
+ fn from_options(options: &WriterOptions) -> Result {
+ Ok(Self {
+ canvas: Canvas::from_options(options, PDF_OPTIONS)?,
+ compress: options.boolean("compress")?.unwrap_or(true),
+ links: options.boolean("links")?.unwrap_or(true),
+ })
+ }
+
+ fn validate(&self, spec: &Plot) -> Result<()> {
+ compose::validate_plot(spec)
+ }
+
+ fn write(&self, spec: &Plot, data: &HashMap) -> Result {
+ self.write_reporting(spec, data).map(|(pdf, _)| pdf)
+ }
+}
+
+/// Put what the format could not express into ggsql's own words.
+///
+/// See `svg::describe` for why this translates rather than re-exports.
+fn describe(warnings: &[PdfWarning]) -> Vec {
+ warnings
+ .iter()
+ .map(|warning| match warning {
+ PdfWarning::SweepGradient => {
+ "a sweep gradient was flattened to a solid colour; PDF has no conic shading".into()
+ }
+ PdfWarning::UnsupportedExtend => {
+ "a gradient asked to repeat or reflect; PDF shadings only pad, so the end colours \
+ were held"
+ .into()
+ }
+ PdfWarning::UnsupportedCompose => {
+ "a blend mode PDF cannot express was drawn as normal compositing".into()
+ }
+ PdfWarning::AsymmetricCaps => {
+ "a stroke asked for different start and end caps; PDF has one, so both took the \
+ start cap"
+ .into()
+ }
+ PdfWarning::ImageBrushUnsupported => {
+ "an image used as a fill or stroke was dropped; PDF cannot paint with one".into()
+ }
+ PdfWarning::UnembeddableImage => "an image's pixel layout could not be embedded".into(),
+ PdfWarning::MissingPngFeature => {
+ "a colour glyph's bitmap could not be decoded: this build has no PNG decoder".into()
+ }
+ PdfWarning::GlyphNotDrawable => {
+ "a glyph had no outline this backend could draw and did not appear".into()
+ }
+ PdfWarning::NonFiniteCoordinate => {
+ "a coordinate was not a finite number and was written as zero".into()
+ }
+ // Unbalanced layers are a defect in the writer rather than a limit
+ // of the format, and the variants are non-exhaustive.
+ other => format!("the plot renderer reported '{other:?}'"),
+ })
+ .collect()
+}
+
+#[cfg(test)]
+impl super::canvas::Canvased for PdfWriter {
+ fn canvas(&self) -> &Canvas {
+ &self.canvas
+ }
+}
+
+#[cfg(test)]
+mod option_tests {
+ use super::*;
+ use crate::writer::hephaestus::canvas::{
+ assert_canvas_semantics, assert_transparent_background,
+ };
+
+ fn writer(pairs: &[&str]) -> Result {
+ PdfWriter::from_options(&WriterOptions::parse(pairs)?)
+ }
+
+ #[test]
+ fn canvas_options_behave_as_they_do_for_every_writer() {
+ assert_canvas_semantics::();
+ assert_transparent_background::();
+ }
+
+ #[test]
+ fn the_default_writer_matches_no_options() {
+ let default = PdfWriter::default();
+ assert_eq!(writer(&[]).unwrap(), default);
+ assert!(default.compress);
+ assert!(default.links);
+ }
+
+ #[test]
+ fn the_flags_take_the_boolean_spellings() {
+ assert!(!writer(&["compress=false"]).unwrap().compress);
+ assert!(!writer(&["compress=no"]).unwrap().compress);
+ assert!(!writer(&["links=off"]).unwrap().links);
+ assert!(writer(&["compress=1", "links=yes"]).unwrap().compress);
+ let err = writer(&["compress=maybe"]).unwrap_err().to_string();
+ assert!(err.contains("'compress' expects true or false"), "{err}");
+ }
+
+ #[test]
+ fn a_transparent_canvas_leaves_the_page_unpainted() {
+ assert_eq!(
+ writer(&["background=none"]).unwrap().config().background,
+ None
+ );
+ assert!(writer(&[]).unwrap().config().background.is_some());
+ }
+}
diff --git a/src/writer/hephaestus/png.rs b/src/writer/hephaestus/png.rs
new file mode 100644
index 00000000..971d16bd
--- /dev/null
+++ b/src/writer/hephaestus/png.rs
@@ -0,0 +1,190 @@
+//! The PNG writer.
+
+use std::collections::HashMap;
+
+use hephaestus::png::{encode_png, PngCompression};
+
+use super::canvas::Canvas;
+use super::{compose, raster, RasterRenderer};
+use crate::writer::{Writer, WriterOptions};
+use crate::{DataFrame, GgsqlError, Plot, Result};
+
+/// Option keys [`PngWriter`] adds to the shared canvas set.
+const PNG_OPTIONS: &[&str] = &["compression"];
+
+/// How hard the PNG encoder works to make the file small.
+const COMPRESSION_VALUES: &[&str] = &["none", "fast", "balanced", "small"];
+
+/// Writer that renders a ggsql plot to a PNG image.
+///
+/// Configured with a target pixel size and DPI because raster rendering needs
+/// concrete dimensions, unlike the resolution-independent Vega-Lite writer.
+/// [`PngWriter::from_options`] builds the same configuration from
+/// key–value [`WriterOptions`]:
+///
+/// | Option | Value | Default |
+/// | --- | --- | --- |
+/// | `width` | Canvas width, in `units` | 1500 px |
+/// | `height` | Canvas height, in `units` | 1000 px |
+/// | `units` | `px`, `in`, `cm`, `mm`, or `pt` — how `width`/`height` are read | `px` |
+/// | `dpi` | Pixels per inch; converts physical sizes, including `units` | 300 |
+/// | `background` | Any CSS color, e.g. `white`, `#ff0000`, `transparent` | `white` |
+/// | `compression` | `none`, `fast`, `balanced`, or `small` | `balanced` |
+///
+/// `compression` trades encode time against file size, losslessly either way.
+/// `balanced` is what a file wants. `fast` is for a caller on a frame deadline —
+/// a host encoding a plot per resize, say — where it costs a fraction of the
+/// time for about half again the bytes.
+///
+/// Rendering requires a working wgpu adapter (hardware or software, e.g.
+/// lavapipe) at render time.
+#[derive(Debug, Clone, Copy, PartialEq)]
+pub struct PngWriter {
+ canvas: Canvas,
+ compression: PngCompression,
+}
+
+impl PngWriter {
+ /// Create a writer for the given pixel dimensions and DPI, white background.
+ pub fn new(width: u32, height: u32, dpi: f64) -> Self {
+ Self {
+ canvas: Canvas::new(width, height, dpi),
+ compression: PngCompression::Balanced,
+ }
+ }
+
+ /// Set the background color used to clear the canvas before rendering.
+ pub fn background(mut self, color: super::Color) -> Self {
+ self.canvas = self.canvas.background(color);
+ self
+ }
+
+ /// Set how hard the encoder works to make the file small.
+ pub fn compression(mut self, compression: PngCompression) -> Self {
+ self.compression = compression;
+ self
+ }
+
+ /// Render through a renderer the caller keeps, rather than building one.
+ ///
+ /// Constructing a [`RasterRenderer`] creates a GPU device and compiles the
+ /// rasteriser's shaders, so a host rendering more than one figure should
+ /// build one once and pass it here.
+ ///
+ /// # Errors
+ ///
+ /// Returns `GgsqlError::WriterError` if the plot cannot be composed, the
+ /// render fails, or the encode fails.
+ pub fn write_with(
+ &self,
+ spec: &Plot,
+ data: &HashMap,
+ renderer: &mut RasterRenderer,
+ ) -> Result> {
+ let pixels = raster::pixels(spec, data, &self.canvas, renderer)?;
+ // `render_to_buffer` hands out straight (un-premultiplied) alpha, which
+ // is exactly what PNG stores, so the buffer encodes as-is.
+ encode_png(
+ self.canvas.width,
+ self.canvas.height,
+ &pixels,
+ self.compression,
+ self.canvas.dpi_hint(),
+ )
+ .map_err(|e| GgsqlError::WriterError(format!("png encode failed: {e}")))
+ }
+
+ /// [`Self::write_with`] from a resolved `Spec`.
+ ///
+ /// # Errors
+ ///
+ /// As [`Self::write_with`].
+ pub fn render_with(
+ &self,
+ spec: &crate::reader::Spec,
+ renderer: &mut RasterRenderer,
+ ) -> Result> {
+ self.write_with(spec.plot(), spec.data(), renderer)
+ }
+}
+
+impl Default for PngWriter {
+ fn default() -> Self {
+ Self {
+ canvas: Canvas::default(),
+ compression: PngCompression::Balanced,
+ }
+ }
+}
+
+impl Writer for PngWriter {
+ type Output = Vec;
+
+ fn from_options(options: &WriterOptions) -> Result {
+ let canvas = Canvas::from_options(options, PNG_OPTIONS)?;
+ let compression = match options.one_of("compression", COMPRESSION_VALUES)? {
+ Some("none") => PngCompression::None,
+ Some("fast") => PngCompression::Fast,
+ Some("small") => PngCompression::Small,
+ _ => PngCompression::Balanced,
+ };
+ Ok(Self {
+ canvas,
+ compression,
+ })
+ }
+
+ fn validate(&self, spec: &Plot) -> Result<()> {
+ compose::validate_plot(spec)
+ }
+
+ fn write(&self, spec: &Plot, data: &HashMap) -> Result {
+ let mut renderer = RasterRenderer::new()?;
+ self.write_with(spec, data, &mut renderer)
+ }
+}
+
+#[cfg(test)]
+impl super::canvas::Canvased for PngWriter {
+ fn canvas(&self) -> &Canvas {
+ &self.canvas
+ }
+}
+
+#[cfg(test)]
+mod option_tests {
+ use super::*;
+ use crate::writer::hephaestus::canvas::assert_canvas_semantics;
+
+ fn writer(pairs: &[&str]) -> Result {
+ PngWriter::from_options(&WriterOptions::parse(pairs)?)
+ }
+
+ #[test]
+ fn canvas_options_behave_as_they_do_for_every_writer() {
+ assert_canvas_semantics::();
+ }
+
+ #[test]
+ fn the_default_writer_matches_no_options() {
+ let default = PngWriter::default();
+ assert_eq!(writer(&[]).unwrap(), default);
+ assert_eq!(default.compression, PngCompression::Balanced);
+ }
+
+ #[test]
+ fn compression_takes_the_four_named_levels() {
+ let cases = [
+ ("none", PngCompression::None),
+ ("fast", PngCompression::Fast),
+ ("balanced", PngCompression::Balanced),
+ ("small", PngCompression::Small),
+ ];
+ for (value, expected) in cases {
+ let w = writer(&[&format!("compression={value}")]).unwrap();
+ assert_eq!(w.compression, expected, "compression={value}");
+ }
+ let err = writer(&["compression=furlongs"]).unwrap_err().to_string();
+ assert!(err.contains("'compression' expects"), "{err}");
+ }
+}
diff --git a/src/writer/hephaestus/raster.rs b/src/writer/hephaestus/raster.rs
index e875065e..7c1068cb 100644
--- a/src/writer/hephaestus/raster.rs
+++ b/src/writer/hephaestus/raster.rs
@@ -4,12 +4,15 @@
//! that needs an adapter at all: the vector and document writers build a scene
//! or a byte string from the same `PlotComposition` and never come through here.
+use std::collections::HashMap;
+
use hephaestus::backend::vello::VelloRenderer;
use hephaestus::plot::PlotComposition;
use hephaestus::{Renderer, SceneBuilder};
use super::canvas::Canvas;
-use crate::{GgsqlError, Result};
+use super::compose;
+use crate::{DataFrame, GgsqlError, Plot, Result};
/// A GPU renderer held across renders.
///
@@ -57,3 +60,24 @@ pub fn render_rgba8(
.map_err(|e| GgsqlError::WriterError(format!("render failed: {e}")))?;
Ok(pixels)
}
+
+/// Everything a raster writer does before its encoder: check the plot, compose
+/// it, and rasterise it at the canvas's size and resolution.
+///
+/// The four raster writers differ only in the encoder they hand the result to,
+/// so this is the whole of what they share.
+///
+/// # Errors
+///
+/// Returns `GgsqlError::WriterError` if the plot cannot be drawn by this
+/// renderer, if composing it fails, or if the render does.
+pub fn pixels(
+ spec: &Plot,
+ data: &HashMap,
+ canvas: &Canvas,
+ renderer: &mut RasterRenderer,
+) -> Result> {
+ compose::validate_plot(spec)?;
+ let mut view = compose::build_composition(spec, data)?;
+ render_rgba8(&mut view, canvas, renderer)
+}
diff --git a/src/writer/hephaestus/svg.rs b/src/writer/hephaestus/svg.rs
new file mode 100644
index 00000000..cefddb76
--- /dev/null
+++ b/src/writer/hephaestus/svg.rs
@@ -0,0 +1,307 @@
+//! The SVG writer.
+
+use std::collections::HashMap;
+
+use hephaestus::svg::{encode_svg, SvgConfig, SvgScene, SvgUnits, SvgWarning, TextMode};
+
+use super::canvas::Canvas;
+use super::{compose, vector};
+use crate::writer::{Writer, WriterOptions};
+use crate::{DataFrame, Plot, Result};
+
+/// Option keys [`SvgWriter`] adds to the shared canvas set.
+const SVG_OPTIONS: &[&str] = &["text", "embed-fonts", "id-prefix"];
+
+/// How text is written into the file.
+const TEXT_VALUES: &[&str] = &["text", "outline"];
+
+/// Writer that renders a ggsql plot to SVG.
+///
+/// Needs **no GPU adapter**: SVG records the same drawing commands the
+/// rasteriser would have executed, so this writer works on a headless box, in
+/// a container with no graphics stack, and in CI. The output is resolution
+/// independent and its text is real text — selectable, searchable, and
+/// editable in a vector tool.
+///
+/// [`SvgWriter::from_options`] takes:
+///
+/// | Option | Value | Default |
+/// | --- | --- | --- |
+/// | `width` | Canvas width, in `units` | 1500 px |
+/// | `height` | Canvas height, in `units` | 1000 px |
+/// | `units` | `px`, `in`, `cm`, `mm`, or `pt` — how `width`/`height` are read | `px` |
+/// | `dpi` | Pixels per inch; converts physical sizes, including `units` | 300 |
+/// | `background` | Any CSS color; `transparent` emits no background at all | `white` |
+/// | `text` | `text` (real ``) or `outline` (glyphs as ``) | `text` |
+/// | `embed-fonts` | Inline the font files, so the file renders identically anywhere | `false` |
+/// | `id-prefix` | Prefix for generated element ids | none |
+///
+/// `units` is honoured in the output as well as in the input: a canvas given in
+/// a physical unit declares its size in points, so
+/// `width=6;height=4;units=in;dpi=300` yields an 1800×1200 `viewBox` on a
+/// `432pt` root — a file that *prints* six inches wide. A pixel canvas stays in
+/// pixels.
+///
+/// `text=outline` makes the file self-contained without embedding a font, at
+/// the cost of text that can no longer be selected or searched. `embed-fonts`
+/// keeps the text but can take a 30 kB plot past 3 MB, since a system font is
+/// often megabytes — which is why neither is the default.
+///
+/// **`id-prefix` is a correctness setting, not a nicety.** Two SVGs inlined
+/// into one HTML page that both define `#lg0` will have the second's
+/// `url(#lg0)` resolve to the first's gradient, in every browser. Give each
+/// one its own prefix when inlining more than one.
+#[derive(Debug, Clone, PartialEq, Default)]
+pub struct SvgWriter {
+ canvas: Canvas,
+ text: TextMode,
+ embed_fonts: bool,
+ id_prefix: Option,
+}
+
+impl SvgWriter {
+ /// Create a writer for the given pixel dimensions and DPI, white background.
+ pub fn new(width: u32, height: u32, dpi: f64) -> Self {
+ Self {
+ canvas: Canvas::new(width, height, dpi),
+ ..Self::default()
+ }
+ }
+
+ /// Set the background painted behind the plot.
+ ///
+ /// A fully transparent color emits no background element at all, rather
+ /// than a full-canvas rect painted in transparent black.
+ pub fn background(mut self, color: super::Color) -> Self {
+ self.canvas = self.canvas.background(color);
+ self
+ }
+
+ /// Write glyph outlines as `` instead of `` elements.
+ pub fn outline_text(mut self, outline: bool) -> Self {
+ self.text = if outline {
+ TextMode::Outline
+ } else {
+ TextMode::Text
+ };
+ self
+ }
+
+ /// Inline the font files the plot uses.
+ pub fn embed_fonts(mut self, embed: bool) -> Self {
+ self.embed_fonts = embed;
+ self
+ }
+
+ /// Prefix every generated element id, so two inlined files cannot collide.
+ pub fn id_prefix(mut self, prefix: impl Into) -> Self {
+ self.id_prefix = Some(prefix.into());
+ self
+ }
+
+ /// Render, reporting anything SVG could not express.
+ ///
+ /// [`Writer::write`] discards the report. Take it when the output is an
+ /// artifact someone will ship: a dropped gradient is a defect in the file,
+ /// not a detail of how it was made. The list is empty for everything ggsql
+ /// itself draws.
+ ///
+ /// # Errors
+ ///
+ /// Returns `GgsqlError::WriterError` if the plot cannot be composed.
+ pub fn write_reporting(
+ &self,
+ spec: &Plot,
+ data: &HashMap,
+ ) -> Result<(String, Vec)> {
+ let mut scene = SvgScene::with_config(self.canvas.size(), self.canvas.dpi, self.config());
+ vector::draw(spec, data, &self.canvas, &mut scene)?;
+ Ok((encode_svg(&scene), describe(scene.warnings())))
+ }
+
+ /// [`Self::write_reporting`] from a resolved `Spec`.
+ ///
+ /// # Errors
+ ///
+ /// As [`Self::write_reporting`].
+ pub fn render_reporting(&self, spec: &crate::reader::Spec) -> Result<(String, Vec)> {
+ self.write_reporting(spec.plot(), spec.data())
+ }
+
+ /// The emission options this writer's settings amount to.
+ fn config(&self) -> SvgConfig {
+ let units = if self.canvas.physical {
+ // A canvas asked for in inches should print at that size, which is
+ // what a `pt` root declares. `SvgUnits::Pt` leaves the viewBox in
+ // pixels and only suffixes `width`/`height`.
+ SvgUnits::Pt
+ } else {
+ SvgUnits::Px
+ };
+ let mut config = SvgConfig::new()
+ .background(self.canvas.vector_background())
+ .units(units)
+ .text(self.text)
+ .embed_fonts(self.embed_fonts);
+ if let Some(prefix) = &self.id_prefix {
+ config = config.id_prefix(prefix.clone());
+ }
+ config
+ }
+}
+
+impl Writer for SvgWriter {
+ type Output = String;
+
+ fn from_options(options: &WriterOptions) -> Result {
+ let canvas = Canvas::from_options(options, SVG_OPTIONS)?;
+ let text = match options.one_of("text", TEXT_VALUES)? {
+ Some("outline") => TextMode::Outline,
+ _ => TextMode::Text,
+ };
+ Ok(Self {
+ canvas,
+ text,
+ embed_fonts: options.boolean("embed-fonts")?.unwrap_or(false),
+ id_prefix: options.get("id-prefix").map(str::to_string),
+ })
+ }
+
+ fn validate(&self, spec: &Plot) -> Result<()> {
+ compose::validate_plot(spec)
+ }
+
+ fn write(&self, spec: &Plot, data: &HashMap) -> Result {
+ self.write_reporting(spec, data).map(|(svg, _)| svg)
+ }
+}
+
+/// Put what the format could not express into ggsql's own words.
+///
+/// The renderer's warning variants are `#[non_exhaustive]`, so mirroring them
+/// as a ggsql enum would mean re-deriving a growing list on every release, and
+/// re-exporting them would leak the renderer's type names into ggsql's API.
+/// Translating at the boundary is also where those names get scrubbed.
+fn describe(warnings: &[SvgWarning]) -> Vec {
+ warnings
+ .iter()
+ .map(|warning| match warning {
+ SvgWarning::SweepGradient => {
+ "a sweep gradient was flattened to a solid colour; SVG has no conic gradient".into()
+ }
+ SvgWarning::UnsupportedCompose => {
+ "a blend mode SVG cannot express was drawn as normal compositing".into()
+ }
+ SvgWarning::AsymmetricCaps => {
+ "a stroke asked for different start and end caps; SVG has one, so both took the \
+ start cap"
+ .into()
+ }
+ SvgWarning::RadialFocalRadius => {
+ "a radial gradient's focal radius was written as SVG 2's 'fr', which older \
+ viewers ignore"
+ .into()
+ }
+ SvgWarning::ImageBrushUnsupported => {
+ "an image used as a fill or stroke was dropped; SVG cannot paint with one".into()
+ }
+ SvgWarning::NonFiniteCoordinate => {
+ "a coordinate was not a finite number and was written as zero".into()
+ }
+ SvgWarning::TextWithoutSource => {
+ "some text arrived with neither a string nor an outline and was not drawn".into()
+ }
+ SvgWarning::MissingPngFeature => {
+ "an image could not be embedded: this build has no PNG encoder".into()
+ }
+ SvgWarning::UnembeddableImage => "an image's pixel layout could not be embedded".into(),
+ SvgWarning::FontNotEmbeddable => {
+ "a font could not be inlined — font collections cannot be — so its text will \
+ render in whatever font the viewer resolves"
+ .into()
+ }
+ // Unbalanced layers or scopes are a defect in the writer rather
+ // than a limit of the format, and the variants are non-exhaustive.
+ other => format!("the plot renderer reported '{other:?}'"),
+ })
+ .collect()
+}
+
+#[cfg(test)]
+impl super::canvas::Canvased for SvgWriter {
+ fn canvas(&self) -> &Canvas {
+ &self.canvas
+ }
+}
+
+#[cfg(test)]
+mod option_tests {
+ use super::*;
+ use crate::writer::hephaestus::canvas::{
+ assert_canvas_semantics, assert_transparent_background,
+ };
+
+ fn writer(pairs: &[&str]) -> Result {
+ SvgWriter::from_options(&WriterOptions::parse(pairs)?)
+ }
+
+ #[test]
+ fn canvas_options_behave_as_they_do_for_every_writer() {
+ assert_canvas_semantics::();
+ assert_transparent_background::();
+ }
+
+ #[test]
+ fn the_default_writer_matches_no_options() {
+ let default = SvgWriter::default();
+ assert_eq!(writer(&[]).unwrap(), default);
+ assert_eq!(default.text, TextMode::Text);
+ assert!(!default.embed_fonts);
+ assert_eq!(default.id_prefix, None);
+ }
+
+ #[test]
+ fn text_takes_the_two_modes() {
+ assert_eq!(writer(&["text=text"]).unwrap().text, TextMode::Text);
+ assert_eq!(writer(&["text=outline"]).unwrap().text, TextMode::Outline);
+ let err = writer(&["text=fancy"]).unwrap_err().to_string();
+ assert!(err.contains("'text' expects 'text' or 'outline'"), "{err}");
+ }
+
+ #[test]
+ fn the_flags_read_either_spelling_of_their_key() {
+ for key in ["embed-fonts", "embed_fonts"] {
+ assert!(
+ writer(&[&format!("{key}=true")]).unwrap().embed_fonts,
+ "{key}"
+ );
+ assert!(
+ !writer(&[&format!("{key}=no")]).unwrap().embed_fonts,
+ "{key}"
+ );
+ }
+ for key in ["id-prefix", "id_prefix"] {
+ let w = writer(&[&format!("{key}=fig1-")]).unwrap();
+ assert_eq!(w.id_prefix.as_deref(), Some("fig1-"), "{key}");
+ }
+ let err = writer(&["embed-fonts=maybe"]).unwrap_err().to_string();
+ assert!(err.contains("'embed_fonts' expects true or false"), "{err}");
+ }
+
+ #[test]
+ fn a_transparent_canvas_emits_no_background_element() {
+ let clear = writer(&["background=none"]).unwrap();
+ assert_eq!(clear.config().background, None);
+ let white = writer(&[]).unwrap();
+ assert!(white.config().background.is_some());
+ }
+
+ #[test]
+ fn a_physical_canvas_declares_its_size_in_points() {
+ assert_eq!(
+ writer(&["units=in", "width=6"]).unwrap().config().units,
+ SvgUnits::Pt
+ );
+ assert_eq!(writer(&["width=600"]).unwrap().config().units, SvgUnits::Px);
+ }
+}
diff --git a/src/writer/hephaestus/tiff.rs b/src/writer/hephaestus/tiff.rs
new file mode 100644
index 00000000..8488dbf7
--- /dev/null
+++ b/src/writer/hephaestus/tiff.rs
@@ -0,0 +1,184 @@
+//! The TIFF writer.
+
+use std::collections::HashMap;
+
+use hephaestus::image::encode_tiff;
+pub use hephaestus::image::TiffCompression;
+
+use super::canvas::Canvas;
+use super::{compose, raster, RasterRenderer};
+use crate::writer::{Writer, WriterOptions};
+use crate::{DataFrame, GgsqlError, Plot, Result};
+
+/// Option keys [`TiffWriter`] adds to the shared canvas set.
+const TIFF_OPTIONS: &[&str] = &["compression"];
+
+/// How a TIFF's image data is compressed. All four are lossless.
+const COMPRESSION_VALUES: &[&str] = &["none", "deflate", "lzw", "packbits"];
+
+/// Writer that renders a ggsql plot to a TIFF image.
+///
+/// Lossless with alpha preserved, and the format a print workflow or an older
+/// imaging tool is most likely to insist on. [`TiffWriter::from_options`] takes:
+///
+/// | Option | Value | Default |
+/// | --- | --- | --- |
+/// | `width` | Canvas width, in `units` | 1500 px |
+/// | `height` | Canvas height, in `units` | 1000 px |
+/// | `units` | `px`, `in`, `cm`, `mm`, or `pt` — how `width`/`height` are read | `px` |
+/// | `dpi` | Pixels per inch; converts physical sizes, including `units` | 300 |
+/// | `background` | Any CSS color, e.g. `white`, `#ff0000`, `transparent` | `white` |
+/// | `compression` | `none`, `deflate`, `lzw`, or `packbits` | `deflate` |
+///
+/// `compression` is a compatibility choice rather than a speed one, since all
+/// four are lossless: `deflate` is the smallest and what a file wants, `lzw` is
+/// the compressed form the widest range of old readers open, `packbits` is cheap
+/// and does well on the flat fills a plot is mostly made of, and `none` stores
+/// rows verbatim for a reader that handles no compression at all.
+///
+/// Rendering requires a working wgpu adapter (hardware or software, e.g.
+/// lavapipe) at render time.
+#[derive(Debug, Clone, Copy, PartialEq, Default)]
+pub struct TiffWriter {
+ canvas: Canvas,
+ compression: TiffCompression,
+}
+
+impl TiffWriter {
+ /// Create a writer for the given pixel dimensions and DPI, white background.
+ pub fn new(width: u32, height: u32, dpi: f64) -> Self {
+ Self {
+ canvas: Canvas::new(width, height, dpi),
+ compression: TiffCompression::default(),
+ }
+ }
+
+ /// Set the background color used to clear the canvas before rendering.
+ pub fn background(mut self, color: super::Color) -> Self {
+ self.canvas = self.canvas.background(color);
+ self
+ }
+
+ /// Set how the image data is compressed.
+ pub fn compression(mut self, compression: TiffCompression) -> Self {
+ self.compression = compression;
+ self
+ }
+
+ /// Render through a renderer the caller keeps, rather than building one.
+ ///
+ /// Constructing a [`RasterRenderer`] creates a GPU device and compiles the
+ /// rasteriser's shaders, so a host rendering more than one figure should
+ /// build one once and pass it here.
+ ///
+ /// # Errors
+ ///
+ /// Returns `GgsqlError::WriterError` if the plot cannot be composed, the
+ /// render fails, or the encode fails.
+ pub fn write_with(
+ &self,
+ spec: &Plot,
+ data: &HashMap,
+ renderer: &mut RasterRenderer,
+ ) -> Result> {
+ let pixels = raster::pixels(spec, data, &self.canvas, renderer)?;
+ encode_tiff(
+ self.canvas.width,
+ self.canvas.height,
+ &pixels,
+ self.compression,
+ self.canvas.dpi_hint(),
+ )
+ .map_err(|e| GgsqlError::WriterError(format!("tiff encode failed: {e}")))
+ }
+
+ /// [`Self::write_with`] from a resolved `Spec`.
+ ///
+ /// # Errors
+ ///
+ /// As [`Self::write_with`].
+ pub fn render_with(
+ &self,
+ spec: &crate::reader::Spec,
+ renderer: &mut RasterRenderer,
+ ) -> Result> {
+ self.write_with(spec.plot(), spec.data(), renderer)
+ }
+}
+
+impl Writer for TiffWriter {
+ type Output = Vec;
+
+ fn from_options(options: &WriterOptions) -> Result {
+ let canvas = Canvas::from_options(options, TIFF_OPTIONS)?;
+ let compression = match options.one_of("compression", COMPRESSION_VALUES)? {
+ Some("none") => TiffCompression::None,
+ Some("lzw") => TiffCompression::Lzw,
+ Some("packbits") => TiffCompression::Packbits,
+ _ => TiffCompression::Deflate,
+ };
+ Ok(Self {
+ canvas,
+ compression,
+ })
+ }
+
+ fn validate(&self, spec: &Plot) -> Result<()> {
+ compose::validate_plot(spec)
+ }
+
+ fn write(&self, spec: &Plot, data: &HashMap) -> Result {
+ let mut renderer = RasterRenderer::new()?;
+ self.write_with(spec, data, &mut renderer)
+ }
+}
+
+#[cfg(test)]
+impl super::canvas::Canvased for TiffWriter {
+ fn canvas(&self) -> &Canvas {
+ &self.canvas
+ }
+}
+
+#[cfg(test)]
+mod option_tests {
+ use super::*;
+ use crate::writer::hephaestus::canvas::{
+ assert_canvas_semantics, assert_transparent_background,
+ };
+
+ fn writer(pairs: &[&str]) -> Result {
+ TiffWriter::from_options(&WriterOptions::parse(pairs)?)
+ }
+
+ #[test]
+ fn canvas_options_behave_as_they_do_for_every_writer() {
+ assert_canvas_semantics::();
+ assert_transparent_background::();
+ }
+
+ #[test]
+ fn the_default_writer_matches_no_options() {
+ let default = TiffWriter::default();
+ assert_eq!(writer(&[]).unwrap(), default);
+ assert_eq!(default.compression, TiffCompression::Deflate);
+ }
+
+ #[test]
+ fn compression_takes_the_four_named_compressors() {
+ let cases = [
+ ("none", TiffCompression::None),
+ ("deflate", TiffCompression::Deflate),
+ ("lzw", TiffCompression::Lzw),
+ ("packbits", TiffCompression::Packbits),
+ ];
+ for (value, expected) in cases {
+ let w = writer(&[&format!("compression={value}")]).unwrap();
+ assert_eq!(w.compression, expected, "compression={value}");
+ }
+ // A png level is not a tiff compressor, and the error says which are.
+ let err = writer(&["compression=fast"]).unwrap_err().to_string();
+ assert!(err.contains("'compression' expects"), "{err}");
+ assert!(err.contains("packbits"), "{err}");
+ }
+}
diff --git a/src/writer/hephaestus/vector.rs b/src/writer/hephaestus/vector.rs
new file mode 100644
index 00000000..d156711c
--- /dev/null
+++ b/src/writer/hephaestus/vector.rs
@@ -0,0 +1,36 @@
+//! Drawing a composition into a vector scene.
+//!
+//! The counterpart to [`raster`](super::raster) for the backends that emit
+//! drawing commands rather than pixels. `PlotComposition::render` takes
+//! `&mut dyn SceneBuilder`, so this is the *same* call the rasteriser makes —
+//! which is why SVG and PDF need no GPU adapter, no wgpu, and no encoder: they
+//! record the composition's own output.
+
+use std::collections::HashMap;
+
+use hephaestus::SceneBuilder;
+
+use super::canvas::Canvas;
+use super::compose;
+use crate::{DataFrame, Plot, Result};
+
+/// Check the plot, compose it, and draw it into `scene`.
+///
+/// Everything a vector writer does before serialising, and all either of them
+/// shares — what differs is the scene type and how it is turned into bytes.
+///
+/// # Errors
+///
+/// Returns `GgsqlError::WriterError` if the plot cannot be drawn by this
+/// renderer, or if composing it fails.
+pub fn draw(
+ spec: &Plot,
+ data: &HashMap,
+ canvas: &Canvas,
+ scene: &mut dyn SceneBuilder,
+) -> Result<()> {
+ compose::validate_plot(spec)?;
+ let mut view = compose::build_composition(spec, data)?;
+ view.render(scene, canvas.size(), canvas.dpi);
+ Ok(())
+}
diff --git a/src/writer/hephaestus/webp.rs b/src/writer/hephaestus/webp.rs
new file mode 100644
index 00000000..e8316407
--- /dev/null
+++ b/src/writer/hephaestus/webp.rs
@@ -0,0 +1,152 @@
+//! The WebP writer.
+
+use std::collections::HashMap;
+
+use hephaestus::image::encode_webp;
+
+use super::canvas::Canvas;
+use super::{compose, raster, RasterRenderer};
+use crate::writer::{Writer, WriterOptions};
+use crate::{DataFrame, GgsqlError, Plot, Result};
+
+/// Writer that renders a ggsql plot to a lossless WebP image.
+///
+/// The best default for a raster plot delivered over a wire: it is lossless
+/// like PNG, alpha included, encodes about as fast as `png` at
+/// `compression=fast`, and on plot content — flat fills and hard edges rather
+/// than photographic detail — lands at roughly half the bytes.
+///
+/// There is no `quality` and no `compression`: the writer emits the VP8L
+/// lossless bitstream, which has no rate control to expose. Every other option
+/// is the shared canvas set:
+///
+/// | Option | Value | Default |
+/// | --- | --- | --- |
+/// | `width` | Canvas width, in `units` | 1500 px |
+/// | `height` | Canvas height, in `units` | 1000 px |
+/// | `units` | `px`, `in`, `cm`, `mm`, or `pt` — how `width`/`height` are read | `px` |
+/// | `dpi` | Pixels per inch; converts physical sizes, including `units` | 300 |
+/// | `background` | Any CSS color, e.g. `white`, `#ff0000`, `transparent` | `white` |
+///
+/// Rendering requires a working wgpu adapter (hardware or software, e.g.
+/// lavapipe) at render time.
+#[derive(Debug, Clone, Copy, PartialEq, Default)]
+pub struct WebpWriter {
+ canvas: Canvas,
+}
+
+impl WebpWriter {
+ /// Create a writer for the given pixel dimensions and DPI, white background.
+ pub fn new(width: u32, height: u32, dpi: f64) -> Self {
+ Self {
+ canvas: Canvas::new(width, height, dpi),
+ }
+ }
+
+ /// Set the background color used to clear the canvas before rendering.
+ pub fn background(mut self, color: super::Color) -> Self {
+ self.canvas = self.canvas.background(color);
+ self
+ }
+
+ /// Render through a renderer the caller keeps, rather than building one.
+ ///
+ /// Constructing a [`RasterRenderer`] creates a GPU device and compiles the
+ /// rasteriser's shaders, so a host rendering more than one figure should
+ /// build one once and pass it here.
+ ///
+ /// # Errors
+ ///
+ /// Returns `GgsqlError::WriterError` if the plot cannot be composed, the
+ /// render fails, or the encode fails.
+ pub fn write_with(
+ &self,
+ spec: &Plot,
+ data: &HashMap,
+ renderer: &mut RasterRenderer,
+ ) -> Result> {
+ let pixels = raster::pixels(spec, data, &self.canvas, renderer)?;
+ // Straight alpha in, straight alpha out — VP8L stores exactly the
+ // buffer the renderer read back.
+ encode_webp(
+ self.canvas.width,
+ self.canvas.height,
+ &pixels,
+ self.canvas.dpi_hint(),
+ )
+ .map_err(|e| GgsqlError::WriterError(format!("webp encode failed: {e}")))
+ }
+
+ /// [`Self::write_with`] from a resolved `Spec`.
+ ///
+ /// # Errors
+ ///
+ /// As [`Self::write_with`].
+ pub fn render_with(
+ &self,
+ spec: &crate::reader::Spec,
+ renderer: &mut RasterRenderer,
+ ) -> Result> {
+ self.write_with(spec.plot(), spec.data(), renderer)
+ }
+}
+
+impl Writer for WebpWriter {
+ type Output = Vec;
+
+ fn from_options(options: &WriterOptions) -> Result {
+ Ok(Self {
+ canvas: Canvas::from_options(options, &[])?,
+ })
+ }
+
+ fn validate(&self, spec: &Plot) -> Result<()> {
+ compose::validate_plot(spec)
+ }
+
+ fn write(&self, spec: &Plot, data: &HashMap) -> Result {
+ let mut renderer = RasterRenderer::new()?;
+ self.write_with(spec, data, &mut renderer)
+ }
+}
+
+#[cfg(test)]
+impl super::canvas::Canvased for WebpWriter {
+ fn canvas(&self) -> &Canvas {
+ &self.canvas
+ }
+}
+
+#[cfg(test)]
+mod option_tests {
+ use super::*;
+ use crate::writer::hephaestus::canvas::{
+ assert_canvas_semantics, assert_transparent_background,
+ };
+
+ #[test]
+ fn canvas_options_behave_as_they_do_for_every_writer() {
+ assert_canvas_semantics::();
+ assert_transparent_background::();
+ }
+
+ #[test]
+ fn the_default_writer_matches_no_options() {
+ let options = WriterOptions::parse(&[] as &[&str]).unwrap();
+ assert_eq!(
+ WebpWriter::from_options(&options).unwrap(),
+ WebpWriter::default()
+ );
+ }
+
+ #[test]
+ fn there_is_no_rate_knob_to_mistype() {
+ // VP8L has no quality or compression setting, so naming one is an error
+ // rather than a silently ignored request for a smaller file.
+ for absent in ["quality=80", "compression=fast"] {
+ let options = WriterOptions::parse([absent]).unwrap();
+ let err = WebpWriter::from_options(&options).unwrap_err().to_string();
+ assert!(err.contains("unknown writer option"), "{absent}: {err}");
+ }
+ }
+}
diff --git a/src/writer/mod.rs b/src/writer/mod.rs
index 507897e1..c29eceec 100644
--- a/src/writer/mod.rs
+++ b/src/writer/mod.rs
@@ -54,8 +54,24 @@ mod hephaestus;
#[cfg(feature = "graphics")]
pub use hephaestus::{rgba, Canvas, Color};
+#[cfg(feature = "raster")]
+pub use hephaestus::RasterRenderer;
+
+#[cfg(feature = "jpeg")]
+pub use hephaestus::JpegWriter;
+#[cfg(feature = "webp")]
+pub use hephaestus::WebpWriter;
+
+#[cfg(feature = "hep")]
+pub use hephaestus::HepWriter;
+#[cfg(feature = "pdf")]
+pub use hephaestus::PdfWriter;
+#[cfg(feature = "svg")]
+pub use hephaestus::SvgWriter;
#[cfg(feature = "png")]
-pub use hephaestus::{PngWriter, RasterRenderer};
+pub use hephaestus::{PngCompression, PngWriter};
+#[cfg(feature = "tiff")]
+pub use hephaestus::{TiffCompression, TiffWriter};
/// Trait for visualization output writers
///
diff --git a/src/writer/options.rs b/src/writer/options.rs
index 241fafa3..e7ff57dd 100644
--- a/src/writer/options.rs
+++ b/src/writer/options.rs
@@ -168,11 +168,15 @@ impl WriterOptions {
/// Returns `GgsqlError::WriterError` naming the unknown keys and listing
/// the supported ones.
pub fn reject_unknown(&self, known: &[&str]) -> Result<()> {
+ // The declared names are normalised too, so a writer may declare the
+ // hyphenated spelling its docs use (`embed-fonts`) and still match a
+ // key given either way. The error still lists them as declared.
+ let canonical: Vec = known.iter().map(|key| normalise_key(key)).collect();
let unknown: Vec<&str> = self
.values
.keys()
.map(String::as_str)
- .filter(|key| !known.contains(key))
+ .filter(|key| !canonical.iter().any(|k| k == key))
.collect();
if unknown.is_empty() {
return Ok(());
From da803111e8a7afc6248b2a91b28725f25d0d9632 Mon Sep 17 00:00:00 2001
From: Thomas Lin Pedersen
Date: Sat, 5 Sep 2026 14:56:41 +0200
Subject: [PATCH 03/21] Add window mode to CLI and switch to vello hybrid
---
CHANGELOG.md | 7 +
Cargo.lock | 1357 ++++++++++++++++++++++++++++---
ggsql-cli/CLAUDE.md | 13 +-
ggsql-cli/Cargo.toml | 4 +
ggsql-cli/src/main.rs | 108 +++
src/CLAUDE.md | 9 +-
src/Cargo.toml | 33 +-
src/writer/hephaestus/CLAUDE.md | 53 +-
src/writer/hephaestus/canvas.rs | 78 +-
src/writer/hephaestus/mod.rs | 9 +-
src/writer/hephaestus/png.rs | 5 +-
src/writer/hephaestus/raster.rs | 24 +-
src/writer/hephaestus/window.rs | 240 ++++++
src/writer/mod.rs | 26 +-
14 files changed, 1821 insertions(+), 145 deletions(-)
create mode 100644 src/writer/hephaestus/window.rs
diff --git a/CHANGELOG.md b/CHANGELOG.md
index cb157a6f..81feff03 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -29,6 +29,13 @@
wide. `hep` produces no picture at all: it captures the resolved plot —
scales, breaks, labels, theme, geometry and data — so a host can render it
itself at any size and re-render on resize without re-running the query.
+- New `ggsql view` subcommand shows a query's plot in a native window, blocking
+ until it is closed: `ggsql view "SELECT … VISUALISE …"`. Resizing the window
+ re-lays-out the plot rather than stretching it. `-D` (`--viewer-option`) takes
+ `width`, `height`, `background` and `title`; `units` and `dpi` are refused,
+ since a window is sized in logical pixels and its resolution belongs to the
+ display. Behind a new off-by-default `window` feature, and needs a GPU
+ adapter. The subcommand exists either way and says what would enable it.
- Writers can be configured from key–value options: `Writer::from_options` takes
a `WriterOptions` set, and the CLI collects them from a repeatable
`--writer-option key=value` flag on `exec` and `run` (short `-D`, also
diff --git a/Cargo.lock b/Cargo.lock
index 340b04ff..e713a1ec 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2,6 +2,22 @@
# It is not intended for manual editing.
version = 4
+[[package]]
+name = "ab_glyph"
+version = "0.2.32"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "01c0457472c38ea5bd1c3b5ada5e368271cb550be7a4ca4a0b4634e9913f6cc2"
+dependencies = [
+ "ab_glyph_rasterizer",
+ "owned_ttf_parser",
+]
+
+[[package]]
+name = "ab_glyph_rasterizer"
+version = "0.1.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "366ffbaa4442f4684d91e2cd7c5ea7c4ed8add41959a31447066e279e432b618"
+
[[package]]
name = "adbc_core"
version = "0.23.0"
@@ -104,6 +120,31 @@ version = "0.2.21"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "683d7910e743518b0e34f1186f92494becacb047c7b6bf616c96772180fef923"
+[[package]]
+name = "android-activity"
+version = "0.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0f2a1bb052857d5dd49572219344a7332b31b76405648eabac5bc68978251bcd"
+dependencies = [
+ "android-properties",
+ "bitflags 2.11.1",
+ "cc",
+ "jni",
+ "libc",
+ "log",
+ "ndk",
+ "ndk-context",
+ "ndk-sys",
+ "num_enum",
+ "thiserror 2.0.18",
+]
+
+[[package]]
+name = "android-properties"
+version = "0.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fc7eb209b1518d6bb87b283c20095f5228ecda460da70b44f0802523dea6da04"
+
[[package]]
name = "android_system_properties"
version = "0.1.5"
@@ -113,6 +154,17 @@ dependencies = [
"libc",
]
+[[package]]
+name = "annotate-snippets"
+version = "0.12.16"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f211a51805bc641f3ad5b7664c77d2547af685cc33b4cd8d31964027a46f13f1"
+dependencies = [
+ "anstyle",
+ "memchr",
+ "unicode-width 0.2.2",
+]
+
[[package]]
name = "anstream"
version = "1.0.0"
@@ -187,6 +239,12 @@ dependencies = [
"derive_arbitrary",
]
+[[package]]
+name = "arrayref"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "76a2e8124351fda1ef8aaaa3bbd7ebbcb486bbcd4225aca0aa0d84bb2db8fecb"
+
[[package]]
name = "arrayvec"
version = "0.7.6"
@@ -381,7 +439,7 @@ version = "58.3.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "f633dbfdf39c039ada1bf9e34c694816eb71fbb7dc78f613993b7245e078a1ed"
dependencies = [
- "bitflags",
+ "bitflags 2.11.1",
"serde_core",
"serde_json",
]
@@ -417,6 +475,21 @@ dependencies = [
"regex-syntax",
]
+[[package]]
+name = "as-raw-xcb-connection"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "175571dd1d178ced59193a6fc02dde1b972eb0bc56c892cde9beeceac5bf0f6b"
+
+[[package]]
+name = "ascii-canvas"
+version = "4.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ef1e3e699d84ab1b0911a1010c5c106aa34ae89aeac103be5ce0c3859db1e891"
+dependencies = [
+ "term",
+]
+
[[package]]
name = "ash"
version = "0.38.0+1.3.281"
@@ -531,6 +604,12 @@ version = "0.9.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "b71798fca2c1fe1086445a7258a4bc81e6e49dcd24c8d0dd9a1e57395b603f51"
+[[package]]
+name = "bitflags"
+version = "1.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
+
[[package]]
name = "bitflags"
version = "2.11.1"
@@ -558,13 +637,22 @@ dependencies = [
"generic-array",
]
+[[package]]
+name = "block2"
+version = "0.5.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2c132eebf10f5cad5289222520a4a058514204aed6d791f1cf4fe8088b82d15f"
+dependencies = [
+ "objc2 0.5.2",
+]
+
[[package]]
name = "block2"
version = "0.6.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "cdeb9d870516001442e364c5220d3574d2da8dc765554b4a617230d33fa58ef5"
dependencies = [
- "objc2",
+ "objc2 0.6.4",
]
[[package]]
@@ -675,6 +763,32 @@ version = "1.11.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "1e748733b7cbc798e1434b6ac524f0c1ff2ab456fe201501e6497c8417a4fc33"
+[[package]]
+name = "calloop"
+version = "0.13.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b99da2f8558ca23c71f4fd15dc57c906239752dd27ff3c00a1d56b685b7cbfec"
+dependencies = [
+ "bitflags 2.11.1",
+ "log",
+ "polling",
+ "rustix 0.38.44",
+ "slab",
+ "thiserror 1.0.69",
+]
+
+[[package]]
+name = "calloop-wayland-source"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "95a66a987056935f7efce4ab5668920b5d0dac4a7c99991a67395f13702ddd20"
+dependencies = [
+ "calloop",
+ "rustix 0.38.44",
+ "wayland-backend",
+ "wayland-client",
+]
+
[[package]]
name = "cast"
version = "0.3.0"
@@ -793,6 +907,9 @@ name = "color"
version = "0.3.3"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "2ec7c5eb7a16992b1904d76c517d170ab353b0e0b3d5a0c81a8a0cd1037893cf"
+dependencies = [
+ "bytemuck",
+]
[[package]]
name = "colorchoice"
@@ -800,6 +917,16 @@ version = "1.0.5"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "1d07550c9036bf2ae0c684c4297d503f838287c83c53686d05370d0e139ae570"
+[[package]]
+name = "combine"
+version = "4.6.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cfc320937d09e6de266b31b9afb480f197d7a861be86be7cb2ea7e5d1bfffc5e"
+dependencies = [
+ "bytes",
+ "memchr",
+]
+
[[package]]
name = "comfy-table"
version = "7.1.4"
@@ -811,6 +938,15 @@ dependencies = [
"unicode-width 0.2.2",
]
+[[package]]
+name = "concurrent-queue"
+version = "2.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4ca0197aee26d1ae37445ee532fefce43251d24cc7c166799f4d46817f1d3973"
+dependencies = [
+ "crossbeam-utils",
+]
+
[[package]]
name = "const-random"
version = "0.1.18"
@@ -870,12 +1006,46 @@ dependencies = [
"crossterm 0.29.0",
]
+[[package]]
+name = "core-foundation"
+version = "0.9.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "91e195e091a93c46f7102ec7818a2aa394e1e1771c3ab4825963fa03e45afb8f"
+dependencies = [
+ "core-foundation-sys",
+ "libc",
+]
+
[[package]]
name = "core-foundation-sys"
version = "0.8.7"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "773648b94d0e5d620f64f280777445740e61fe701025087ec8b57f45c791888b"
+[[package]]
+name = "core-graphics"
+version = "0.23.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c07782be35f9e1140080c6b96f0d44b739e2278479f64e02fdab4e32dfd8b081"
+dependencies = [
+ "bitflags 1.3.2",
+ "core-foundation",
+ "core-graphics-types",
+ "foreign-types",
+ "libc",
+]
+
+[[package]]
+name = "core-graphics-types"
+version = "0.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "45390e6114f68f718cc7a830514a96f903cccd70d02a8f6d9f643ac4ba45afaf"
+dependencies = [
+ "bitflags 1.3.2",
+ "core-foundation",
+ "libc",
+]
+
[[package]]
name = "core_maths"
version = "0.1.1"
@@ -991,7 +1161,7 @@ version = "0.28.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "829d955a0bb380ef178a640b91779e3987da38c9aea133b20614cfed8cdea9c6"
dependencies = [
- "bitflags",
+ "bitflags 2.11.1",
"crossterm_winapi",
"parking_lot",
"rustix 0.38.44",
@@ -1004,7 +1174,7 @@ version = "0.29.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "d8b9f2e4c67f833b660cdb0a3523065869fb35570177239812ed4c905aeff87b"
dependencies = [
- "bitflags",
+ "bitflags 2.11.1",
"crossterm_winapi",
"derive_more",
"document-features",
@@ -1074,6 +1244,12 @@ dependencies = [
"memchr",
]
+[[package]]
+name = "cursor-icon"
+version = "1.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f27ae1dd37df86211c42e150270f82743308803d90a6f6e6651cd730d5e1732f"
+
[[package]]
name = "dashmap"
version = "5.5.3"
@@ -1583,7 +1759,7 @@ dependencies = [
"itertools",
"parking_lot",
"paste",
- "petgraph",
+ "petgraph 0.8.3",
"tokio",
]
@@ -1769,6 +1945,7 @@ dependencies = [
"quote",
"rustc_version",
"syn 2.0.117",
+ "unicode-xid",
]
[[package]]
@@ -1782,14 +1959,20 @@ dependencies = [
"subtle",
]
+[[package]]
+name = "dispatch"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bd0c93bb4b0c6d9b77f4435b0ae98c24d17f1c45b2ff844c6151a07256ca923b"
+
[[package]]
name = "dispatch2"
version = "0.3.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "1e0e367e4e7da84520dedcac1901e4da967309406d1e51017ae1abfb97adbd38"
dependencies = [
- "bitflags",
- "objc2",
+ "bitflags 2.11.1",
+ "objc2 0.6.4",
]
[[package]]
@@ -1821,6 +2004,18 @@ dependencies = [
"litrs",
]
+[[package]]
+name = "downcast-rs"
+version = "1.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "75b325c5dbd37f80359721ad39aca5a29fb04c89279657cffdda8736d0c0b9d2"
+
+[[package]]
+name = "dpi"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d8b14ccef22fc6f5a8f4d7d768562a182c04ce9a3b3157b91390b52ddfdf1a76"
+
[[package]]
name = "duckdb"
version = "1.10502.0"
@@ -1861,6 +2056,15 @@ dependencies = [
"serde",
]
+[[package]]
+name = "ena"
+version = "0.14.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "eabffdaee24bd1bf95c5ef7cec31260444317e72ea56c4c91750e8b7ee58d5f1"
+dependencies = [
+ "log",
+]
+
[[package]]
name = "equivalent"
version = "1.0.2"
@@ -1930,6 +2134,12 @@ dependencies = [
"simd-adler32",
]
+[[package]]
+name = "fearless_simd"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b97b65636e5b9ef369943878ac74335ba1c55c1cb6adbf1e2c293c624248d693"
+
[[package]]
name = "filetime"
version = "0.2.29"
@@ -1958,7 +2168,7 @@ version = "25.12.19"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "35f6839d7b3b98adde531effaf34f0c2badc6f4735d26fe74709d8e513a96ef3"
dependencies = [
- "bitflags",
+ "bitflags 2.11.1",
"rustc_version",
]
@@ -1984,6 +2194,12 @@ dependencies = [
"serde",
]
+[[package]]
+name = "fnv"
+version = "1.0.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3f9eec918d3f24069decb9af1554cad7c880e2da24a9afd88aca000531ab82c1"
+
[[package]]
name = "foldhash"
version = "0.1.5"
@@ -2023,10 +2239,10 @@ dependencies = [
"hashbrown 0.17.1",
"linebender_resource_handle",
"memmap2",
- "objc2",
+ "objc2 0.6.4",
"objc2-core-foundation",
"objc2-core-text",
- "objc2-foundation",
+ "objc2-foundation 0.3.2",
"parlance",
"read-fonts 0.39.2",
"roxmltree",
@@ -2036,6 +2252,33 @@ dependencies = [
"yeslogic-fontconfig-sys",
]
+[[package]]
+name = "foreign-types"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d737d9aa519fb7b749cbc3b962edcf310a8dd1f4b67c91c4f83975dbdd17d965"
+dependencies = [
+ "foreign-types-macros",
+ "foreign-types-shared",
+]
+
+[[package]]
+name = "foreign-types-macros"
+version = "0.2.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ea5190182e6915eb873ddbc16e23b711b6eb1f9c00a0d0a3a91b5f6228475225"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 3.0.4",
+]
+
+[[package]]
+name = "foreign-types-shared"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "aa9a19cbb55df58761df49b23516a86d432839add4af60fc256da840f66ed35b"
+
[[package]]
name = "form_urlencoded"
version = "1.2.2"
@@ -2207,6 +2450,16 @@ dependencies = [
"wkt",
]
+[[package]]
+name = "gethostname"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1bd49230192a3797a9a4d6abe9b3eed6f7fa4c8a8a4947977c6f80025f92cbd8"
+dependencies = [
+ "rustix 1.1.4",
+ "windows-link",
+]
+
[[package]]
name = "getrandom"
version = "0.2.17"
@@ -2346,6 +2599,22 @@ dependencies = [
"xml-rs",
]
+[[package]]
+name = "glifo"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "282a26c1e23de04bdab3e34a21b6f877a479b96737792516b9b8b8f69b6661be"
+dependencies = [
+ "bytemuck",
+ "foldhash 0.2.0",
+ "hashbrown 0.17.1",
+ "log",
+ "peniko",
+ "skrifa 0.44.0",
+ "smallvec",
+ "vello_common",
+]
+
[[package]]
name = "glob"
version = "0.3.3"
@@ -2393,7 +2662,7 @@ version = "0.3.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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dependencies = [
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dependencies = [
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- "cpufeatures",
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dependencies = [
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+ "smallvec",
+ "wayland-sys",
+]
+
+[[package]]
+name = "wayland-client"
+version = "0.31.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e3c36a0f861ad76d0901f2800b46321410d9f73f2ea88aac0650d86c32688073"
+dependencies = [
+ "bitflags 2.11.1",
+ "rustix 1.1.4",
+ "wayland-backend",
+ "wayland-scanner",
+]
+
+[[package]]
+name = "wayland-csd-frame"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "625c5029dbd43d25e6aa9615e88b829a5cad13b2819c4ae129fdbb7c31ab4c7e"
+dependencies = [
+ "bitflags 2.11.1",
+ "cursor-icon",
+ "wayland-backend",
+]
+
+[[package]]
+name = "wayland-cursor"
+version = "0.31.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4a52d18780be9b1314328a3de5f930b73d2200112e3849ca6cb11822793fb34d"
+dependencies = [
+ "rustix 1.1.4",
+ "wayland-client",
+ "xcursor",
+]
+
+[[package]]
+name = "wayland-protocols"
+version = "0.32.13"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "23d0c813de3daa2ed6520af85a3bd49b0e722a3078506899aa9686fea58dc4b6"
+dependencies = [
+ "bitflags 2.11.1",
+ "wayland-backend",
+ "wayland-client",
+ "wayland-scanner",
+]
+
+[[package]]
+name = "wayland-protocols-plasma"
+version = "0.3.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2b6d8cf1eb2c1c31ed1f5643c88a6e53538129d4af80030c8cabd1f9fa884d91"
+dependencies = [
+ "bitflags 2.11.1",
+ "wayland-backend",
+ "wayland-client",
+ "wayland-protocols",
+ "wayland-scanner",
+]
+
+[[package]]
+name = "wayland-protocols-wlr"
+version = "0.3.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "eb04e52f7836d7c7976c78ca0250d61e33873c34156a2a1fc9474828ec268234"
+dependencies = [
+ "bitflags 2.11.1",
+ "wayland-backend",
+ "wayland-client",
+ "wayland-protocols",
+ "wayland-scanner",
+]
+
+[[package]]
+name = "wayland-scanner"
+version = "0.31.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "338e30461b3a2b67d70eb30a6d89f8e0c93a833e07d2ae89085cd070c4a00ac0"
+dependencies = [
+ "proc-macro2",
+ "quick-xml",
+ "quote",
+]
+
[[package]]
name = "wayland-sys"
version = "0.31.11"
@@ -5884,6 +6873,35 @@ version = "0.1.12"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "a28ac98ddc8b9274cb41bb4d9d4d5c425b6020c50c46f25559911905610b4a88"
+[[package]]
+name = "wesl"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dc3857a39e7220245e4ec1e2f6230e1b5ccd3542545bc1ee5c13d79597e6d193"
+dependencies = [
+ "annotate-snippets",
+ "derive_more",
+ "half",
+ "itertools",
+ "num-traits",
+ "thiserror 2.0.18",
+ "wesl-macros",
+ "wgsl-parse",
+ "wgsl-types",
+]
+
+[[package]]
+name = "wesl-macros"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8662ee0b2ef199c31f486b869e5272ac364898c09d352483370d37b8c3abf9f9"
+dependencies = [
+ "itertools",
+ "proc-macro2",
+ "quote",
+ "syn 2.0.117",
+]
+
[[package]]
name = "wgpu"
version = "29.0.3"
@@ -5891,7 +6909,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "bb3feacc458f7bee8bc1737149b42b6c731aa461039a4264a67bb6681646b250"
dependencies = [
"arrayvec",
- "bitflags",
+ "bitflags 2.11.1",
"bytemuck",
"cfg-if",
"cfg_aliases",
@@ -5922,7 +6940,7 @@ dependencies = [
"arrayvec",
"bit-set 0.9.1",
"bit-vec 0.9.1",
- "bitflags",
+ "bitflags 2.11.1",
"bytemuck",
"cfg_aliases",
"document-features",
@@ -5983,8 +7001,8 @@ dependencies = [
"arrayvec",
"ash",
"bit-set 0.9.1",
- "bitflags",
- "block2",
+ "bitflags 2.11.1",
+ "block2 0.6.2",
"bytemuck",
"cfg-if",
"cfg_aliases",
@@ -6000,11 +7018,11 @@ dependencies = [
"log",
"naga",
"ndk-sys",
- "objc2",
+ "objc2 0.6.4",
"objc2-core-foundation",
- "objc2-foundation",
- "objc2-metal",
- "objc2-quartz-core",
+ "objc2-foundation 0.3.2",
+ "objc2-metal 0.3.2",
+ "objc2-quartz-core 0.3.2",
"once_cell",
"ordered-float 5.3.0",
"parking_lot",
@@ -6043,7 +7061,7 @@ version = "29.0.3"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "a9bcc31518a0e9735aefebedb5f7a9ef3ed1c42549c9f4c882fa9060ceaac639"
dependencies = [
- "bitflags",
+ "bitflags 2.11.1",
"bytemuck",
"js-sys",
"log",
@@ -6051,6 +7069,34 @@ dependencies = [
"web-sys",
]
+[[package]]
+name = "wgsl-parse"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2141e2425fbb5aefd13e875adc7247e5dc889a3bbbe5a016dd1546211405f89f"
+dependencies = [
+ "annotate-snippets",
+ "derive_more",
+ "itertools",
+ "lalrpop",
+ "lalrpop-util",
+ "lexical",
+ "logos",
+ "thiserror 2.0.18",
+ "wgsl-types",
+]
+
+[[package]]
+name = "wgsl-types"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d3cf8623d173060d5a9e1465b89954ea42f3ac21af2f533c7975d003f8d82b98"
+dependencies = [
+ "half",
+ "itertools",
+ "num-traits",
+]
+
[[package]]
name = "winapi"
version = "0.3.9"
@@ -6368,6 +7414,58 @@ version = "0.53.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "d6bbff5f0aada427a1e5a6da5f1f98158182f26556f345ac9e04d36d0ebed650"
+[[package]]
+name = "winit"
+version = "0.30.13"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a6755fa58a9f8350bd1e472d4c3fcc25f824ec358933bba33306d0b63df5978d"
+dependencies = [
+ "ahash 0.8.12",
+ "android-activity",
+ "atomic-waker",
+ "bitflags 2.11.1",
+ "block2 0.5.1",
+ "bytemuck",
+ "calloop",
+ "cfg_aliases",
+ "concurrent-queue",
+ "core-foundation",
+ "core-graphics",
+ "cursor-icon",
+ "dpi",
+ "js-sys",
+ "libc",
+ "memmap2",
+ "ndk",
+ "objc2 0.5.2",
+ "objc2-app-kit",
+ "objc2-foundation 0.2.2",
+ "objc2-ui-kit",
+ "orbclient",
+ "percent-encoding",
+ "pin-project",
+ "raw-window-handle",
+ "redox_syscall 0.4.1",
+ "rustix 0.38.44",
+ "sctk-adwaita",
+ "smithay-client-toolkit",
+ "smol_str",
+ "tracing",
+ "unicode-segmentation",
+ "wasm-bindgen",
+ "wasm-bindgen-futures",
+ "wayland-backend",
+ "wayland-client",
+ "wayland-protocols",
+ "wayland-protocols-plasma",
+ "web-sys",
+ "web-time",
+ "windows-sys 0.52.0",
+ "x11-dl",
+ "x11rb",
+ "xkbcommon-dl",
+]
+
[[package]]
name = "winnow"
version = "0.7.15"
@@ -6450,7 +7548,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "9d66ea20e9553b30172b5e831994e35fbde2d165325bec84fc43dbf6f4eb9cb2"
dependencies = [
"anyhow",
- "bitflags",
+ "bitflags 2.11.1",
"indexmap",
"log",
"serde",
@@ -6507,6 +7605,38 @@ dependencies = [
"tap",
]
+[[package]]
+name = "x11-dl"
+version = "2.21.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "38735924fedd5314a6e548792904ed8c6de6636285cb9fec04d5b1db85c1516f"
+dependencies = [
+ "libc",
+ "once_cell",
+ "pkg-config",
+]
+
+[[package]]
+name = "x11rb"
+version = "0.13.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9993aa5be5a26815fe2c3eacfc1fde061fc1a1f094bf1ad2a18bf9c495dd7414"
+dependencies = [
+ "as-raw-xcb-connection",
+ "gethostname",
+ "libc",
+ "libloading",
+ "once_cell",
+ "rustix 1.1.4",
+ "x11rb-protocol",
+]
+
+[[package]]
+name = "x11rb-protocol"
+version = "0.13.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ea6fc2961e4ef194dcbfe56bb845534d0dc8098940c7e5c012a258bfec6701bd"
+
[[package]]
name = "xattr"
version = "1.6.1"
@@ -6517,6 +7647,31 @@ dependencies = [
"rustix 1.1.4",
]
+[[package]]
+name = "xcursor"
+version = "0.3.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "163b33ed8786455e2fa5d72f554057ce3f3182425434f756cd39c99839d88e23"
+
+[[package]]
+name = "xkbcommon-dl"
+version = "0.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d039de8032a9a8856a6be89cea3e5d12fdd82306ab7c94d74e6deab2460651c5"
+dependencies = [
+ "bitflags 2.11.1",
+ "dlib",
+ "log",
+ "once_cell",
+ "xkeysym",
+]
+
+[[package]]
+name = "xkeysym"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b9cc00251562a284751c9973bace760d86c0276c471b4be569fe6b068ee97a56"
+
[[package]]
name = "xml-rs"
version = "0.8.28"
diff --git a/ggsql-cli/CLAUDE.md b/ggsql-cli/CLAUDE.md
index bec43e5f..08255f8f 100644
--- a/ggsql-cli/CLAUDE.md
+++ b/ggsql-cli/CLAUDE.md
@@ -27,12 +27,15 @@ The binary name is `ggsql` (not `ggsql-cli`) — that's what release artifacts a
| --- | --- |
| `exec` | Run a ggsql query string (default reader `duckdb://memory`, writer `vegalite`) |
| `run` | Like `exec`, but reads the query from a file |
+| `view` | Show a query's plot in a native window; blocks until it closes (`window` feature) |
| `parse` | Print the parsed AST (formats: `pretty`, `debug`, `json`) — debugging aid |
| `validate` | Syntax + semantic check without executing SQL |
| `docs` | Render embedded ggsql syntax docs (TTY → ANSI via termimad, pipe → markdown, `--format json` → structured) |
| `skill` | Render the AI-assistant skill from `/doc/vendor/SKILL.md` |
| `agent-info` | Alias for `skill` |
+The subcommand list does not change with features: `view` is always defined, and every writer is always a `--writer` name. What changes is whether it can do anything, and it says so.
+
Only public `ggsql::*` API is used (`reader`, `writer`, `validate`, `parser`, `VERSION`) — this crate has no awareness of internal modules.
`exec` and `run` share their flags through one `#[derive(Args)] RenderArgs` (`--reader`, `--writer`, `-D`, `--output`, `--verbose`) that both subcommands `#[command(flatten)]`, so a flag's help text and default exist once. `RenderArgs::writer()` resolves them into a `WriterSpec { info, options }` **in `main`, before any SQL runs** — an unknown `--writer`, a writer whose feature is off, and a `-D` pair that is not `key=value` all fail there rather than after the query has executed. `WriterSpec` then travels down `cmd_exec` → `exec_with_reader` → `render_spec`.
@@ -45,7 +48,15 @@ Which keys a writer accepts is the writer's business, and an unknown one is its
Render functions return `Result<(Output, Vec), String>`: the output plus anything the writer had to degrade to produce it. They report failure rather than exiting, so `render_spec` owns how a problem is presented. **Warnings go to stderr unconditionally, not behind `-v`** — something the writer could not express is a defect in the file the user is about to ship, and stderr keeps it out of a piped artifact.
-`open_reader(uri) -> Result, String>` is the matching single place for connection strings. `ggsql::reader::Reader` is object-safe on purpose, so every subcommand that needs data shares one function that knows which schemes exist and which of them this build has.
+`open_reader(uri) -> Result, String>` is the matching single place for connection strings. `ggsql::reader::Reader` is object-safe on purpose, so every subcommand that needs data shares one function that knows which schemes exist and which of them this build has — `exec`, `run` and `view` all go through it.
+
+### `view`, and why the window code is not here
+
+`view` flattens its own `ViewArgs` rather than `RenderArgs`: there is no `--writer` to pick and no `--output` to write, and its `-D` (`--viewer-option`) carries the viewer's settings rather than a writer's.
+
+**The window itself lives in the library, as `ggsql::writer::PlotViewer`** — and that is the decision most likely to be re-litigated, so: *only public `ggsql::*` API is used; this crate has no awareness of internal modules.* For the CLI to call the renderer's `window::run` itself it would have to take a direct hephaestus dependency, name `PlotComposition` and `WindowConfig` in its own source, and pin hephaestus in a second place — breaking that invariant three ways. So the *behaviour* goes public as a type instead, and `cmd_view` stays thin: parse options, open the reader, execute, call `show`. `show` blocks on the main thread until the window closes.
+
+**The subcommand is defined unconditionally.** Without the `window` feature it prints what would bring it back. A subcommand that vanishes between builds is worse than one that explains itself — the same reasoning as `WriterInfo::compiled`.
## Build & install
diff --git a/ggsql-cli/Cargo.toml b/ggsql-cli/Cargo.toml
index ca87a0dc..04d8575a 100644
--- a/ggsql-cli/Cargo.toml
+++ b/ggsql-cli/Cargo.toml
@@ -69,6 +69,10 @@ webp = ["ggsql/webp", "any-writer"]
svg = ["ggsql/svg", "any-writer"]
pdf = ["ggsql/pdf", "any-writer"]
hep = ["ggsql/hep", "any-writer"]
+
+# The plot viewer. Not a writer, so deliberately not in `all-writers`: it
+# blocks, it is native-only, and it produces no output.
+window = ["ggsql/window"]
builtin-data = ["ggsql/builtin-data"]
all-readers = ["duckdb", "sqlite", "odbc"]
all-writers = ["vegalite", "png", "jpeg", "tiff", "webp", "svg", "pdf", "hep"]
diff --git a/ggsql-cli/src/main.rs b/ggsql-cli/src/main.rs
index 9a21ebbf..c116b5b3 100644
--- a/ggsql-cli/src/main.rs
+++ b/ggsql-cli/src/main.rs
@@ -65,6 +65,35 @@ pub struct RenderArgs {
pub verbose: bool,
}
+/// The flags `view` takes: where the data comes from and how the window looks.
+///
+/// Deliberately not [`RenderArgs`]: there is no `--writer` to choose and no
+/// `--output` to write, and `-D` carries the viewer's own settings rather than
+/// a writer's.
+#[derive(Args)]
+pub struct ViewArgs {
+ /// Data source connection string (duckdb://, sqlite://, odbc://)
+ #[arg(short, long, default_value = "duckdb://memory")]
+ pub reader: String,
+
+ /// Viewer settings, as `key=value` (repeatable)
+ #[arg(
+ short = 'D',
+ long = "viewer-option",
+ visible_alias = "viewer-options",
+ value_name = "KEY=VALUE[;...]",
+ long_help = "Settings for the viewer window, as `key=value`. Repeatable, and one flag \
+ may carry several settings separated by `;` (quote it, as most shells read \
+ `;` themselves): `-D 'width=1280;title=My plot'`.\n\nSettings:\n \
+ width, height, background, title"
+ )]
+ pub viewer_options: Vec,
+
+ /// Show verbose output (execution details, statistics)
+ #[arg(short, long)]
+ pub verbose: bool,
+}
+
impl RenderArgs {
/// Resolve `--writer` and its settings, exiting on an unknown name or a
/// setting that is not `key=value`. Both are the user's mistake, and
@@ -110,6 +139,20 @@ pub enum Commands {
render: RenderArgs,
},
+ /// Show a ggsql query's plot in a window
+ ///
+ /// Blocks until the window is closed. Resizing the window re-lays-out the
+ /// plot rather than stretching it.
+ ///
+ /// Requires the `window` feature and a working GPU adapter.
+ View {
+ /// The ggsql query to show
+ query: String,
+
+ #[command(flatten)]
+ view: ViewArgs,
+ },
+
/// Parse a query and show the AST (for debugging)
Parse {
/// The ggsql query to parse
@@ -197,6 +240,13 @@ fn main() -> anyhow::Result<()> {
cmd_run(file, &render, &writer);
}
+ Commands::View { query, view } => {
+ if view.verbose {
+ eprintln!("Showing query: {}", query);
+ }
+ cmd_view(query, &view);
+ }
+
Commands::Parse { query, format } => {
cmd_parse(query, format);
}
@@ -391,6 +441,64 @@ fn render_spec(spec: Spec, args: &RenderArgs, writer: &WriterSpec) {
};
}
+/// Show a query's plot in a window, blocking until it closes.
+///
+/// The subcommand exists whether or not the feature does: one that vanishes
+/// between builds is worse than one that says what would bring it back.
+fn cmd_view(query: String, args: &ViewArgs) {
+ #[cfg(feature = "window")]
+ {
+ use ggsql::writer::PlotViewer;
+
+ let options = WriterOptions::parse(args.viewer_options.clone()).unwrap_or_else(|e| {
+ eprintln!("{}", e);
+ std::process::exit(1);
+ });
+ let viewer = PlotViewer::from_options(&options).unwrap_or_else(|e| {
+ eprintln!("{}", e);
+ std::process::exit(1);
+ });
+
+ let reader = open_reader(&args.reader).unwrap_or_else(|e| {
+ eprintln!("{}", e);
+ std::process::exit(1);
+ });
+
+ let validated = validate(&query).unwrap_or_else(|e| {
+ eprintln!("Failed to validate query: {}", e);
+ std::process::exit(1);
+ });
+ if !validated.has_visual() {
+ eprintln!("This query has no VISUALISE clause, so there is no plot to show.");
+ std::process::exit(1);
+ }
+
+ let spec = reader.execute(&query).unwrap_or_else(|e| {
+ eprintln!("Failed to execute query: {}", e);
+ std::process::exit(1);
+ });
+
+ if args.verbose {
+ let metadata = spec.metadata();
+ eprintln!(" Rows: {}", metadata.rows);
+ eprintln!(" Layers: {}", metadata.layer_count);
+ eprintln!("Close the window to exit.");
+ }
+
+ // Blocks on the main thread until the window closes.
+ if let Err(e) = viewer.show(&spec) {
+ eprintln!("{}", e);
+ std::process::exit(1);
+ }
+ }
+ #[cfg(not(feature = "window"))]
+ {
+ let _ = (query, args);
+ eprintln!("The plot viewer is not compiled in. Rebuild with --features window");
+ std::process::exit(1);
+ }
+}
+
fn cmd_parse(query: String, format: String) {
println!("Parsing query: {}", query);
println!("Format: {}", format);
diff --git a/src/CLAUDE.md b/src/CLAUDE.md
index 92e6a0be..cc1f24d8 100644
--- a/src/CLAUDE.md
+++ b/src/CLAUDE.md
@@ -76,9 +76,11 @@ The pipeline that takes a parsed `Plot` plus a `Reader` and produces a fully-res
| `svg` / `pdf` | `SvgWriter`, `PdfWriter` | vector text / one PDF page | **none** |
| `hep` | `HepWriter` | a `.hep` plot document — no picture | **none** |
- The last three go through the same composition and the same `render` call (which takes `&mut dyn SceneBuilder`), so they need no adapter, pull in no wgpu, and **compile on the MSRV 1.86 toolchain** — `cargo +1.86 check --features svg,pdf,hep --ignore-rust-version`, where the flag is needed only because `parley` *declares* 1.88 while compiling fine on 1.86. Only the raster writers are genuinely 1.88+.
+ Plus `PlotViewer` behind the `window` feature — not a writer, since it returns no output, blocks, and must run on the main thread. It shows the same composition in a native window, re-laying-out on resize.
-Two **internal** features carry the split, enabled by the writer features rather than named directly: `graphics` is the shared composition layer, and `raster = graphics + hephaestus/vello` adds the GPU rasteriser. Only `raster` pulls in wgpu, vello and pollster, which is what lets a vector-only build skip them — `cargo tree --features graphics` shows none of the three, `--features png` shows 18. `graphics` is also the single module gate for `writer/hephaestus/`, so adding a format needs no change there.
+ The three GPU-free writers go through the same composition and the same `render` call (which takes `&mut dyn SceneBuilder`), so they need no adapter, pull in no wgpu, and **compile on the MSRV 1.86 toolchain** — `cargo +1.86 check --features svg,pdf,hep --ignore-rust-version`, where the flag is needed only because `parley` *declares* 1.88 while compiling fine on 1.86. Only the raster writers are genuinely 1.88+.
+
+Three **internal** features carry the split, enabled by the writer features rather than named directly: `graphics` is the shared composition layer, and `raster = graphics + hephaestus/vello-hybrid` adds the GPU rasteriser. Only `raster` pulls in wgpu, vello_hybrid and pollster, which is what lets a vector-only build skip them — `cargo tree --features graphics` shows none of the three, `--features png` shows 19. `raster-writer` then narrows `raster` once more, to "some writer actually reads pixels back" — the viewer needs the rasteriser without ever doing that. `graphics` is the single module gate for `writer/hephaestus/`, so adding a format needs no change there.
### `plot/`
@@ -112,7 +114,7 @@ Defined in `Cargo.toml`:
| `spatial` | ✓ | Spatial/geometry support (geozero for WKT↔GeoJSON) |
| `vegalite` | ✓ | Vega-Lite writer |
| `graphics` | — | *Internal.* The shared plot-composition layer; no GPU |
-| `raster` | — | *Internal.* `graphics` + the GPU rasteriser (wgpu/vello) |
+| `raster` | — | *Internal.* `graphics` + the GPU rasteriser (wgpu/vello-hybrid) |
| `png` | — | PNG writer (`raster`; excluded from the MSRV build) |
| `jpeg` | — | JPEG writer (`raster`) |
| `tiff` | — | TIFF writer (`raster`) |
@@ -121,6 +123,7 @@ Defined in `Cargo.toml`:
| `pdf` | — | PDF writer (`graphics`; no GPU, MSRV-clean) |
| `hep` | — | `.hep` plot-document writer (`graphics`; no GPU, MSRV-clean) |
| `hep-read` | — | **Test-only.** Reading a `.hep` back, for the round-trip test |
+| `window` | — | `PlotViewer` — a native plot window (`raster`; not a writer) |
| `builtin-data` | ✓ | Bundled penguins/airquality datasets |
| `all-readers` | — | `duckdb` + `sqlite` + `odbc` |
| `all-writers` | — | every writer above except the test-only `hep-read` |
diff --git a/src/Cargo.toml b/src/Cargo.toml
index 6075d414..6cd8c4da 100644
--- a/src/Cargo.toml
+++ b/src/Cargo.toml
@@ -40,8 +40,8 @@ adbc_core = { version = "0.23", optional = true }
geozero = { workspace = true, optional = true, features = ["with-wkb", "with-wkt", "with-geojson"] }
# Backend for the renderer-backed writers (non-default; gated, excluded from the
-# MSRV 1.86 build). The GPU rasteriser is *not* requested here: `vello` arrives
-# with the `raster` feature, so a build wanting only vector output pulls no wgpu.
+# MSRV 1.86 build). The GPU rasteriser is *not* requested here: it arrives with
+# the `raster` feature, so a build wanting only vector output pulls no wgpu.
hephaestus = { version = "0.4.0", optional = true, default-features = false, features = ["geom-wkb", "geom-wkt"] }
# Serialization
@@ -78,20 +78,31 @@ vegalite = []
# Internal, enabled by the writer features below rather than named directly.
# `graphics` is the shared plot-composition layer; `raster` adds the GPU
# rasteriser on top of it. Splitting them is what lets a vector-only build skip
-# wgpu, vello and pollster entirely — hephaestus gates only `backend::vello`
-# behind that feature, not the plot layer.
+# wgpu, vello_hybrid and pollster entirely — hephaestus gates only its GPU
+# backends behind that feature, not the plot layer.
graphics = ["dep:hephaestus"]
-raster = ["graphics", "hephaestus/vello"]
+# The GPU rasteriser. `vello-hybrid` rather than vello classic: it computes
+# coverage on the CPU and hands the GPU a plain render pipeline. Its GPU buffers
+# are sized to the scene's actual content rather than to fixed caps, so there is
+# no draw-count ceiling to budget against on a dense plot.
+#
+# It transitively enables `hephaestus/png`, so a build wanting only, say, webp
+# still compiles the PNG codec. A few kB, and not worth working around.
+raster = ["graphics", "hephaestus/vello-hybrid"]
+# On when at least one writer reads pixels back. Distinct from `raster`, which
+# only says the GPU rasteriser is available — the plot viewer needs that and
+# presents its frames straight to a window, never through a buffer.
+raster-writer = ["raster"]
# One feature per output format, each pulling in exactly one codec. The knob
# each writer exposes is the axis its format actually has — png trades encode
# time for size, jpeg trades quality for size, tiff picks a compressor, and
# webp is lossless with no rate control at all — so they share no setting they
# would each have to reinterpret.
-png = ["raster", "hephaestus/png"]
-jpeg = ["raster", "hephaestus/jpeg"]
-tiff = ["raster", "hephaestus/tiff"]
-webp = ["raster", "hephaestus/webp"]
+png = ["raster-writer", "hephaestus/png"]
+jpeg = ["raster-writer", "hephaestus/jpeg"]
+tiff = ["raster-writer", "hephaestus/tiff"]
+webp = ["raster-writer", "hephaestus/webp"]
# The vector writers need only `graphics`: they record the composition's own
# drawing commands rather than rasterising them, so they pull in no wgpu, need
@@ -105,6 +116,10 @@ pdf = ["graphics", "hephaestus/pdf"]
hep = ["graphics", "hephaestus/document-write"]
hep-read = ["hep", "hephaestus/document-read"]
+# The plot viewer, which is not a writer: it shows a window and returns nothing.
+# Needs `raster` because a window is presented by the GPU rasteriser.
+window = ["raster", "hephaestus/window"]
+
builtin-data = []
all-readers = ["duckdb", "sqlite", "odbc"]
all-writers = ["vegalite", "png", "jpeg", "tiff", "webp", "svg", "pdf", "hep"]
diff --git a/src/writer/hephaestus/CLAUDE.md b/src/writer/hephaestus/CLAUDE.md
index 7d339711..0a5d2080 100644
--- a/src/writer/hephaestus/CLAUDE.md
+++ b/src/writer/hephaestus/CLAUDE.md
@@ -179,6 +179,7 @@ Layers draw in `spec.layers` order, which is DRAW order, which is z-order.
| [`png.rs`](png.rs), [`jpeg.rs`](jpeg.rs), [`tiff.rs`](tiff.rs), [`webp.rs`](webp.rs) | One raster writer each: its rustdoc option table, `from_options`, and one encoder call. |
| [`svg.rs`](svg.rs), [`pdf.rs`](pdf.rs) | One vector writer each, plus a `describe()` translating what the format could not express into ggsql's vocabulary. |
| [`hep.rs`](hep.rs) | The plot-document writer. Serialises the composition; builds no scene at all. |
+| [`window.rs`](window.rs) | `PlotViewer` — **not a writer.** Shows the composition in a native window and blocks until it closes. |
| [`wiring.rs`](wiring.rs) | The shared, geom-generic machinery: `Ctx`, `GeomSpec` + its parts, `build_and_add`, `wire_positions`, `wire_material`, `MaterialSource`/`resolve_material`, `BandAxes`, `side`/band helpers, `material_legend`, label resolution. |
| [`scales.rs`](scales.rs) | ggsql `Scale` → hephaestus `Scale`. `RangeKind`, transform + palette + break mapping, temporal scales, free-panel scales, `binned_bins`/`bin_at_centre`. |
| [`channels.rs`](channels.rs) | DataFrame column → typed channel data (`ChannelData`, `column_to_*`), group keys, WKB/WKT geometry decoding. |
@@ -485,6 +486,33 @@ suppressing the colorbar frame hephaestus otherwise inherits from its default
`RectElement`. Anything the two writers must agree on that is neither a scale nor
a channel belongs there.
+## The viewer is not a writer
+
+[`window.rs`](window.rs) holds `PlotViewer`, which produces no output at all. It
+is not a `Writer` impl on purpose: `Output = ()` would put "blocks, main thread
+only, native only" into that trait's contract for one implementor's sake.
+`from_options` plus `show(&Spec)` gives the same option ergonomics without
+claiming it writes anything.
+
+It lives in this crate rather than in `ggsql-cli` because the CLI uses only
+public `ggsql::*` API and has no renderer dependency — see
+[`/ggsql-cli/CLAUDE.md`](../../../ggsql-cli/CLAUDE.md). So the *behaviour* goes
+public as a type instead of `build_composition` going public.
+
+Two things follow from what a window is:
+
+- **Resize needs no code.** `Frame::parts()` reports the surface's own size and
+ dpi each frame, and the composition re-solves its layout for them — so a
+ resize is a re-layout, not a rescale. That is the same property the `hep`
+ format exists to preserve.
+- **`units` and `dpi` are rejected, with a reason.** A window is sized in
+ logical pixels and its resolution belongs to the display (`frame.dpi()` wins
+ every draw), so accepting either would be accepting a setting that is then
+ ignored — exactly the silent failure `reject_unknown` exists to prevent. The
+ error says so rather than reporting them as typos. Option parsing reuses
+ `canvas::{whole_pixels, parse_background}`, which is why those are free
+ functions rather than `Canvas` methods.
+
## Adding a geom
1. Add a module under [`geom/`](geom/) returning a `GeomSpec`, and dispatch it in
@@ -608,10 +636,21 @@ so one run inventories every gap at once. Implementation notes:
## Operational constraints
-- **A GPU adapter is required by the four raster writers**, at render time.
- Vello/wgpu is hephaestus's only rasterising backend. CI installs Mesa's
- lavapipe; headless containers need something equivalent. The vector and
- document writers need neither an adapter nor wgpu.
+- **A GPU adapter is required by the four raster writers**, at render time. CI
+ installs Mesa's lavapipe; headless containers need something equivalent. The
+ vector and document writers need neither an adapter nor wgpu.
+- **The backend is Vello Hybrid, not vello classic**, and the choice is named
+ in exactly one place ([`raster.rs`](raster.rs)) so it stays swappable. Hybrid
+ computes coverage on the CPU and gives the GPU a plain render pipeline, which
+ buys two things: its GPU buffers are sized to the scene's actual content
+ instead of fixed caps, so a dense plot has **no draw-count ceiling**; and it
+ can paint binary coverage, so a hit test reports exactly one id per pixel
+ rather than a blend of two — vello classic antialiases its pick pass and can
+ report an id that was never drawn. The second matters only once interaction
+ lands, but it is the reason not to defer the choice. Output differs from
+ vello classic by antialiasing alone (~2% of pixels on a scatter, max channel
+ delta under 70, geometry identical). `hephaestus/vello-hybrid` transitively
+ enables `hephaestus/png`, so a webp-only build still compiles the PNG codec.
- **fontconfig is a build-time dependency on Linux**, for **every**
hephaestus-backed feature and not just the raster ones: text layout goes
through parley/fontique, which links the system fontconfig to enumerate fonts
@@ -622,7 +661,8 @@ so one run inventories every gap at once. Implementation notes:
`hep` need no adapter and no wgpu, so they are the fallback for a machine
that has none — and the reason CI has hard assertions at all.
- **MSRV split, and it is narrower than it looks.** ggsql's MSRV is CRAN-locked
- at 1.86, and only the builds that pull `vello` are genuinely 1.88+. The vector
+ at 1.86, and only the builds that pull the GPU rasteriser are genuinely
+ 1.88+. The vector
and document writers **compile on 1.86** — what refuses is cargo's *floor
check*, because `parley` declares `rust-version = 1.88` while compiling fine
on 1.86, and `--ignore-rust-version` bypasses a declaration check:
@@ -635,7 +675,8 @@ so one run inventories every gap at once. Implementation notes:
remain viable for the R/CRAN target; `png`/`jpeg`/`tiff`/`webp` do not, and
CI runs their steps with `cargo +stable`.
- **The dependency is the published `0.4.0` crate** (`src/Cargo.toml`), pinned
- with `default-features = false` so `vello` arrives only with `raster`. So
+ with `default-features = false` so the GPU rasteriser arrives only with
+ `raster`. So
nothing here blocks publishing ggsql. hephaestus's own semver contract extends
to the `kurbo`, `peniko` and `wgpu` types in its public API, so a bump in any
of those is a breaking change to this writer even when hephaestus's own API
diff --git a/src/writer/hephaestus/canvas.rs b/src/writer/hephaestus/canvas.rs
index bb42c9c8..fb1c02e2 100644
--- a/src/writer/hephaestus/canvas.rs
+++ b/src/writer/hephaestus/canvas.rs
@@ -37,6 +37,7 @@ pub const CANVAS_OPTIONS: &[&str] = &["width", "height", "units", "dpi", "backgr
/// A writer whose canvas is only a hint needs to tell "no size was asked for"
/// apart from "a size was asked for that happens to equal the default", and
/// these are the keys that decide it.
+#[cfg(feature = "hep")]
pub const CANVAS_HINT_OPTIONS: &[&str] = &["width", "height", "units", "dpi"];
/// Units a `width` / `height` option may be given in.
@@ -113,17 +114,7 @@ impl Canvas {
let mut canvas = Self::new(width, height, dpi);
canvas.physical = units != "px";
if let Some(raw) = options.get("background") {
- // `none` is a familiar spelling of a transparent canvas that CSS
- // itself doesn't accept as a color.
- let color = match raw.trim().to_lowercase().as_str() {
- "none" => rgba(0.0, 0.0, 0.0, 0.0),
- _ => parse_color(raw).ok_or_else(|| {
- GgsqlError::WriterError(format!(
- "writer option 'background' expects a CSS color, got '{raw}'"
- ))
- })?,
- };
- canvas = canvas.background(color);
+ canvas = canvas.background(parse_background(raw)?);
}
Ok(canvas)
}
@@ -165,6 +156,28 @@ impl Default for Canvas {
}
}
+/// Read a `background` option's value as a color.
+///
+/// A free function rather than a `Canvas` method because the plot viewer takes
+/// a background without taking a canvas — a window's size is logical pixels and
+/// its resolution belongs to the display.
+///
+/// # Errors
+///
+/// Returns `GgsqlError::WriterError` if the value is not a color.
+pub(super) fn parse_background(raw: &str) -> Result {
+ // `none` is a familiar spelling of a transparent canvas that CSS itself
+ // doesn't accept as a color.
+ match raw.trim().to_lowercase().as_str() {
+ "none" => Ok(rgba(0.0, 0.0, 0.0, 0.0)),
+ _ => parse_color(raw).ok_or_else(|| {
+ GgsqlError::WriterError(format!(
+ "writer option 'background' expects a CSS color, got '{raw}'"
+ ))
+ }),
+ }
+}
+
/// Convert a canvas dimension given in `units` to whole pixels at `dpi`.
///
/// A physical unit goes through inches, so the same figure grows with DPI; `px`
@@ -181,7 +194,7 @@ fn to_pixels(value: f64, units: &str, dpi: f64, key: &str) -> Result {
}
/// Round a pixel count and reject one outside the renderable range.
-fn whole_pixels(pixels: f64, key: &str) -> Result {
+pub(super) fn whole_pixels(pixels: f64, key: &str) -> Result {
let rounded = pixels.round();
if !(1.0..=MAX_DIMENSION).contains(&rounded) {
return Err(GgsqlError::WriterError(format!(
@@ -195,7 +208,18 @@ fn whole_pixels(pixels: f64, key: &str) -> Result {
///
/// Implemented by every renderer-backed writer so the shared option behaviour
/// can be asserted generically instead of once per format.
-#[cfg(test)]
+#[cfg(all(
+ test,
+ any(
+ feature = "png",
+ feature = "jpeg",
+ feature = "tiff",
+ feature = "webp",
+ feature = "svg",
+ feature = "pdf",
+ feature = "hep"
+ )
+))]
pub(super) trait Canvased {
fn canvas(&self) -> &Canvas;
}
@@ -210,7 +234,18 @@ pub(super) trait Canvased {
///
/// Transparency is not covered here: a format without an alpha channel refuses
/// it. See [`assert_transparent_background`] for the writers that accept it.
-#[cfg(test)]
+#[cfg(all(
+ test,
+ any(
+ feature = "png",
+ feature = "jpeg",
+ feature = "tiff",
+ feature = "webp",
+ feature = "svg",
+ feature = "pdf",
+ feature = "hep"
+ )
+))]
pub(super) fn assert_canvas_semantics() {
let build = |pairs: &[&str]| -> Result { W::from_options(&WriterOptions::parse(pairs)?) };
let dims = |pairs: &[&str]| -> (u32, u32, f64) {
@@ -283,7 +318,20 @@ pub(super) fn assert_canvas_semantics() {
for spelling in ["background=transparent", "background=none"] {
let options = WriterOptions::parse([spelling]).unwrap();
diff --git a/src/writer/hephaestus/mod.rs b/src/writer/hephaestus/mod.rs
index 8fdb70e2..572ff041 100644
--- a/src/writer/hephaestus/mod.rs
+++ b/src/writer/hephaestus/mod.rs
@@ -36,7 +36,7 @@ mod compose;
mod facet;
mod geom;
mod projection;
-#[cfg(feature = "raster")]
+#[cfg(feature = "raster-writer")]
mod raster;
mod scales;
#[cfg(any(feature = "svg", feature = "pdf"))]
@@ -57,13 +57,16 @@ mod svg;
mod tiff;
#[cfg(feature = "webp")]
mod webp;
+#[cfg(feature = "window")]
+mod window;
pub use hephaestus::color::{rgba, Color};
pub use canvas::Canvas;
#[cfg(feature = "hep")]
use canvas::CANVAS_HINT_OPTIONS;
-#[cfg(feature = "raster")]
+
+#[cfg(feature = "raster-writer")]
pub use raster::RasterRenderer;
#[cfg(feature = "hep")]
@@ -80,6 +83,8 @@ pub use svg::SvgWriter;
pub use tiff::{TiffCompression, TiffWriter};
#[cfg(feature = "webp")]
pub use webp::WebpWriter;
+#[cfg(feature = "window")]
+pub use window::PlotViewer;
// Re-exported so a caller can name a writer's own setting without depending on
// the renderer crate. Both are plain enums whose variants are the format's own
diff --git a/src/writer/hephaestus/png.rs b/src/writer/hephaestus/png.rs
index 971d16bd..1f18fbba 100644
--- a/src/writer/hephaestus/png.rs
+++ b/src/writer/hephaestus/png.rs
@@ -154,7 +154,9 @@ impl super::canvas::Canvased for PngWriter {
#[cfg(test)]
mod option_tests {
use super::*;
- use crate::writer::hephaestus::canvas::assert_canvas_semantics;
+ use crate::writer::hephaestus::canvas::{
+ assert_canvas_semantics, assert_transparent_background,
+ };
fn writer(pairs: &[&str]) -> Result {
PngWriter::from_options(&WriterOptions::parse(pairs)?)
@@ -163,6 +165,7 @@ mod option_tests {
#[test]
fn canvas_options_behave_as_they_do_for_every_writer() {
assert_canvas_semantics::();
+ assert_transparent_background::();
}
#[test]
diff --git a/src/writer/hephaestus/raster.rs b/src/writer/hephaestus/raster.rs
index 7c1068cb..9adbfe3a 100644
--- a/src/writer/hephaestus/raster.rs
+++ b/src/writer/hephaestus/raster.rs
@@ -3,10 +3,15 @@
//! The one module that names a GPU renderer, and the only part of the writer
//! that needs an adapter at all: the vector and document writers build a scene
//! or a byte string from the same `PlotComposition` and never come through here.
+//!
+//! The backend is Vello Hybrid — coverage computed on the CPU, a plain render
+//! pipeline on the GPU — chosen over vello classic because its buffers are
+//! sized to the scene rather than capped, so a dense plot has no draw-count
+//! ceiling. Which backend that is stays inside this file.
use std::collections::HashMap;
-use hephaestus::backend::vello::VelloRenderer;
+use hephaestus::backend::hybrid::HybridRenderer;
use hephaestus::plot::PlotComposition;
use hephaestus::{Renderer, SceneBuilder};
@@ -16,12 +21,17 @@ use crate::{DataFrame, GgsqlError, Plot, Result};
/// A GPU renderer held across renders.
///
-/// Constructing one creates a wgpu device and compiles the rasteriser's
-/// shaders, which is far too expensive to repeat per figure. A host rendering
+/// Constructing one creates a wgpu device and builds the rasteriser's
+/// pipelines, which is far too expensive to repeat per figure. A host rendering
/// more than one plot — a kernel serving a plot pane, a batch job — should keep
/// one of these and hand it to `render_with`; a one-shot caller can ignore it
-/// and let the writer make its own.
-pub struct RasterRenderer(VelloRenderer);
+/// and let the writer make its own. It is `Send` but not `Sync`, so it moves to
+/// a render thread rather than being shared between them.
+///
+/// Sizing is handled internally: the renderer rebuilds whatever is bound to the
+/// frame dimensions when they change, so one of these serves a sequence of
+/// differently-sized renders.
+pub struct RasterRenderer(HybridRenderer);
impl RasterRenderer {
/// Initialise the renderer, which requires a working GPU adapter.
@@ -33,7 +43,9 @@ impl RasterRenderer {
/// telling apart by a caller that falls back to a different output format,
/// so the message names which happened.
pub fn new() -> Result {
- VelloRenderer::new().map(Self).map_err(|e| {
+ // Not `with_picking`: indexing costs CPU per draw call and nothing here
+ // hit-tests. A host that wants picking wants a live scene, not a file.
+ HybridRenderer::new().map(Self).map_err(|e| {
GgsqlError::WriterError(format!("could not initialise the GPU renderer: {e}"))
})
}
diff --git a/src/writer/hephaestus/window.rs b/src/writer/hephaestus/window.rs
new file mode 100644
index 00000000..3f1ec661
--- /dev/null
+++ b/src/writer/hephaestus/window.rs
@@ -0,0 +1,240 @@
+//! The plot viewer.
+//!
+//! Not a writer: it produces no output. It is here because it needs the same
+//! composition every writer builds, and because the CLI cannot reach it any
+//! other way — `ggsql-cli` uses only public `ggsql::*` API and has no renderer
+//! dependency of its own, so the behaviour has to go public as a type.
+
+use hephaestus::plot::PlotComposition;
+use hephaestus::window::{self, Event, EventCtx, Frame, WindowApp, WindowConfig};
+
+use super::canvas::{parse_background, whole_pixels};
+use crate::reader::Spec;
+use crate::writer::WriterOptions;
+use crate::{GgsqlError, Result};
+
+/// Option keys the viewer understands.
+///
+/// Notably **not** `units` or `dpi`: a window's size is logical pixels and its
+/// resolution belongs to whatever display it opens on, so accepting either
+/// would be accepting a setting that gets ignored.
+const VIEWER_OPTIONS: &[&str] = &["width", "height", "background", "title"];
+
+/// Default window size, matching the renderer's own.
+const DEFAULT_WIDTH: u32 = 800;
+const DEFAULT_HEIGHT: u32 = 600;
+
+/// Shows a ggsql plot in a native window.
+///
+/// **Resizing needs no code.** The composition re-solves its layout at the size
+/// and resolution the window reports each frame, so the plot re-lays-out rather
+/// than stretching — the same property that makes the `.hep` document format
+/// worth having.
+///
+/// [`PlotViewer::from_options`] takes:
+///
+/// | Option | Value | Default |
+/// | --- | --- | --- |
+/// | `width` | Window width in logical pixels | 800 |
+/// | `height` | Window height in logical pixels | 600 |
+/// | `background` | Any CSS color, e.g. `white`, `#ff0000`, `transparent` | `white` |
+/// | `title` | Window title | `ggsql` |
+///
+/// Not a [`Writer`](crate::writer::Writer): it returns no output, it blocks,
+/// and it must run on the main thread — none of which belong in that trait's
+/// contract. `from_options` plus `show` gives the same option ergonomics
+/// without claiming otherwise.
+///
+/// Requires a working GPU adapter, like the raster writers.
+#[derive(Debug, Clone, PartialEq)]
+pub struct PlotViewer {
+ width: u32,
+ height: u32,
+ background: super::Color,
+ title: String,
+}
+
+impl PlotViewer {
+ /// A viewer for a window of the given size in logical pixels.
+ pub fn new(width: u32, height: u32) -> Self {
+ Self {
+ width,
+ height,
+ ..Self::default()
+ }
+ }
+
+ /// Set the window title.
+ pub fn title(mut self, title: impl Into) -> Self {
+ self.title = title.into();
+ self
+ }
+
+ /// Set the color the window is cleared to before each frame.
+ pub fn background(mut self, color: super::Color) -> Self {
+ self.background = color;
+ self
+ }
+
+ /// Build a viewer from free-form key–value options.
+ ///
+ /// # Errors
+ ///
+ /// Returns `GgsqlError::WriterError` for an unknown key or an unusable
+ /// value. `units` and `dpi` are rejected with a reason rather than as
+ /// simple typos, since a caller reaching for them has a real expectation
+ /// the viewer cannot meet.
+ pub fn from_options(options: &WriterOptions) -> Result {
+ for (key, why) in [
+ ("units", "a window is sized in logical pixels"),
+ (
+ "dpi",
+ "a window's resolution belongs to the display it opens on",
+ ),
+ ] {
+ if options.get(key).is_some() {
+ return Err(GgsqlError::WriterError(format!(
+ "the plot viewer takes no '{key}' option: {why}. Render to a file if you \
+ need to choose one"
+ )));
+ }
+ }
+ options.reject_unknown(VIEWER_OPTIONS)?;
+
+ let mut viewer = Self::default();
+ if let Some(width) = options.number("width")? {
+ viewer.width = whole_pixels(width, "width")?;
+ }
+ if let Some(height) = options.number("height")? {
+ viewer.height = whole_pixels(height, "height")?;
+ }
+ if let Some(raw) = options.get("background") {
+ viewer.background = parse_background(raw)?;
+ }
+ if let Some(title) = options.get("title") {
+ viewer.title = title.to_string();
+ }
+ Ok(viewer)
+ }
+
+ /// Show the plot and **block until the window closes.**
+ ///
+ /// Must be called from the main thread: the platform event loops require
+ /// it, and the composition is single-threaded by design anyway.
+ ///
+ /// # Errors
+ ///
+ /// Returns `GgsqlError::WriterError` if the plot cannot be composed, if no
+ /// GPU adapter can drive a window, or if the event loop fails.
+ pub fn show(&self, spec: &Spec) -> Result<()> {
+ super::compose::validate_plot(spec.plot())?;
+ let view = super::compose::build_composition(spec.plot(), spec.data())?;
+
+ let config = WindowConfig::new(self.title.clone())
+ .size(self.width, self.height)
+ .background(self.background);
+
+ window::run(config, SpecApp { view })
+ .map_err(|e| GgsqlError::WriterError(format!("the plot viewer failed: {e}")))
+ }
+}
+
+impl Default for PlotViewer {
+ fn default() -> Self {
+ Self {
+ width: DEFAULT_WIDTH,
+ height: DEFAULT_HEIGHT,
+ background: super::rgba(1.0, 1.0, 1.0, 1.0),
+ title: "ggsql".to_string(),
+ }
+ }
+}
+
+/// One composition, redrawn at whatever size the window currently is.
+struct SpecApp {
+ view: PlotComposition,
+}
+
+impl WindowApp for SpecApp {
+ fn draw(&mut self, frame: &mut Frame<'_>) {
+ // The frame reports its own size and dpi, which is what makes a resize
+ // a re-layout rather than a rescale.
+ let (scene, size, dpi) = frame.parts();
+ self.view.render(scene, size, dpi);
+ }
+
+ fn event(&mut self, ctx: &mut EventCtx<'_>, event: Event) {
+ // The window stays open until the app says otherwise, so closing it is
+ // the one event that needs handling.
+ if matches!(event, Event::CloseRequested) {
+ ctx.exit();
+ }
+ }
+}
+
+#[cfg(test)]
+mod option_tests {
+ use super::*;
+
+ fn viewer(pairs: &[&str]) -> Result {
+ PlotViewer::from_options(&WriterOptions::parse(pairs)?)
+ }
+
+ #[test]
+ fn no_options_gives_the_defaults() {
+ let default = PlotViewer::default();
+ assert_eq!(viewer(&[]).unwrap(), default);
+ assert_eq!((default.width, default.height), (800, 600));
+ assert_eq!(default.title, "ggsql");
+ assert_eq!(default.background.components, [1.0, 1.0, 1.0, 1.0]);
+ }
+
+ #[test]
+ fn size_title_and_background_are_taken_as_given() {
+ let v = viewer(&["width=1280", "height=720", "title=My plot"]).unwrap();
+ assert_eq!((v.width, v.height), (1280, 720));
+ assert_eq!(v.title, "My plot");
+ assert_eq!(
+ viewer(&["background=#ff0000"])
+ .unwrap()
+ .background
+ .components,
+ [1.0, 0.0, 0.0, 1.0]
+ );
+ assert_eq!(
+ viewer(&["background=none"]).unwrap().background.components[3],
+ 0.0
+ );
+ }
+
+ #[test]
+ fn a_physical_size_is_refused_with_a_reason() {
+ // Accepting a `dpi` the viewer then ignores is exactly the silent
+ // failure `reject_unknown` exists to prevent, so these say why rather
+ // than being reported as typos.
+ for (option, expected) in [
+ ("units=in", "sized in logical pixels"),
+ ("dpi=300", "belongs to the display"),
+ ] {
+ let err = viewer(&[option]).unwrap_err().to_string();
+ assert!(err.contains(expected), "{option}: {err}");
+ assert!(err.contains("the plot viewer takes no"), "{option}: {err}");
+ }
+ }
+
+ #[test]
+ fn other_bad_values_are_reported_per_option() {
+ let cases = [
+ ("width=0", "'width' resolves to 0 px"),
+ ("height=abc", "'height' expects a number"),
+ ("background=nope", "'background' expects a CSS color"),
+ ];
+ for (option, expected) in cases {
+ let err = viewer(&[option]).unwrap_err().to_string();
+ assert!(err.contains(expected), "{option}: {err}");
+ }
+ let err = viewer(&["compression=fast"]).unwrap_err().to_string();
+ assert!(err.contains("unknown writer option 'compression'"), "{err}");
+ assert!(err.contains("width, height, background, title"), "{err}");
+ }
+}
diff --git a/src/writer/mod.rs b/src/writer/mod.rs
index c29eceec..8fe6ab66 100644
--- a/src/writer/mod.rs
+++ b/src/writer/mod.rs
@@ -49,12 +49,31 @@ pub use vegalite::VegaLiteWriter;
// Gated on `graphics` — the shared composition layer — rather than on any one
// format, so adding a writer needs no change here beyond its own re-export.
#[cfg(feature = "graphics")]
+// `graphics` and `raster-writer` are internal features, turned on by the writer
+// features rather than named directly. Selecting one alone is a legitimate
+// build — it is how `cargo tree --features graphics` proves the vector path
+// pulls in no wgpu — but it leaves the whole composition layer with nothing
+// consuming it, so every item in here is then genuinely unused. Silence that
+// case only; any build with an actual writer still reports real dead code.
+#[cfg_attr(
+ not(any(
+ feature = "png",
+ feature = "jpeg",
+ feature = "tiff",
+ feature = "webp",
+ feature = "svg",
+ feature = "pdf",
+ feature = "hep",
+ feature = "window"
+ )),
+ allow(dead_code)
+)]
mod hephaestus;
#[cfg(feature = "graphics")]
pub use hephaestus::{rgba, Canvas, Color};
-#[cfg(feature = "raster")]
+#[cfg(feature = "raster-writer")]
pub use hephaestus::RasterRenderer;
#[cfg(feature = "jpeg")]
@@ -68,6 +87,11 @@ pub use hephaestus::HepWriter;
pub use hephaestus::PdfWriter;
#[cfg(feature = "svg")]
pub use hephaestus::SvgWriter;
+
+// Not a writer — it produces no output — but it needs the same composition, so
+// it lives beside them. See its own docs for why it is not a `Writer` impl.
+#[cfg(feature = "window")]
+pub use hephaestus::PlotViewer;
#[cfg(feature = "png")]
pub use hephaestus::{PngCompression, PngWriter};
#[cfg(feature = "tiff")]
From d059d5eb9b9484daab50c4161c001959a628788f Mon Sep 17 00:00:00 2001
From: Thomas Lin Pedersen
Date: Sat, 5 Sep 2026 15:54:06 +0200
Subject: [PATCH 04/21] Plumbing for kernel
---
ggsql-jupyter/CLAUDE.md | 19 ++++
ggsql-jupyter/src/display.rs | 195 ++++++++++++++++++++++++++++-------
ggsql-jupyter/src/kernel.rs | 18 +++-
ggsql-jupyter/src/main.rs | 11 +-
ggsql-vscode/src/manager.ts | 29 +++++-
5 files changed, 225 insertions(+), 47 deletions(-)
diff --git a/ggsql-jupyter/CLAUDE.md b/ggsql-jupyter/CLAUDE.md
index adcb5ecd..590e12d3 100644
--- a/ggsql-jupyter/CLAUDE.md
+++ b/ggsql-jupyter/CLAUDE.md
@@ -35,6 +35,25 @@ ggsql-jupyter/
3. Each `execute_request` is dispatched through `executor.rs` → `ggsql::reader::DuckDBReader::execute(...)`. The kernel keeps a single persistent in-memory DuckDB session so cells share state.
4. The result is wrapped by `display.rs` into a Jupyter `display_data` message — Vega-Lite specs go through vega-embed in an HTML payload (works in classic Jupyter, JupyterLab, and Positron); pure SQL goes out as an HTML table.
+## Where output goes: `SessionKind`
+
+`display.rs`'s `SessionKind` decides which of three output slots a result is aimed at, and it is the thing every rendering decision keys off:
+
+| `SessionKind` | Slot |
+| --- | --- |
+| `PositronConsole` | Positron's Plots pane |
+| `PositronNotebook` | The notebook cell |
+| `Standalone` | A static document — Jupyter, Quarto, nbconvert |
+
+**The console/notebook split is not cosmetic.** Positron routes a plot comm to the Plots pane whatever kind of session opened it, so a notebook session that used one would put its picture in the pane and leave its cell empty. The two need different output paths, and this is what tells them apart.
+
+`SessionKind::resolve(session, mode)` prefers what the frontend *declared* over what its session id looks like:
+
+- **`--session-mode console|notebook|background`** is authoritative. Only a frontend that creates the session can say, which in practice means the ggsql extension — `manager.ts`'s `createKernelSpec` appends it from `sessionMetadata.sessionMode`. The enum's values are already the flag's spelling, so nothing is translated. `background` maps to `Standalone`: it is Positron's session, but attached to no UI, so there is no Positron slot to render into.
+- **The session-id heuristic** is the fallback: a `ggsql-` prefix means Positron (its supervisor tags every session it manages), and `notebook` in the id means a notebook. It exists for external Jupyter and Quarto, which pass no flag, and for extension versions predating it.
+
+Two places deliberately **do not** pass the flag. `writeKernelJson` and `ggsql-jupyter --install` write kernelspecs for *external* frontends, which are exactly the ones that should classify as `Standalone`. And `restoreSession` doesn't rebuild the spec at all — the supervisor replays the argv the session was created with, and a session's mode never changes.
+
## Positron-specific bits
- Kernel info advertises `"output_location": "plot"` so visualizations route to Positron's Plot pane.
diff --git a/ggsql-jupyter/src/display.rs b/ggsql-jupyter/src/display.rs
index 3733e96c..d38df5e2 100644
--- a/ggsql-jupyter/src/display.rs
+++ b/ggsql-jupyter/src/display.rs
@@ -5,48 +5,111 @@
use crate::executor::ExecutionResult;
use crate::message::MessageHeader;
+use clap::ValueEnum;
use ggsql::DataFrame;
use serde_json::{json, Value};
-/// Frontend-supplied hints about the output rendering slot.
+/// What the frontend declared itself to be, via `--session-mode`.
+///
+/// Only a frontend that knows which kind of session it is launching passes
+/// this — in practice the ggsql extension, which knows because it is the one
+/// creating the session. Everything else leaves it unset and is classified by
+/// the heuristic below.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, ValueEnum)]
+pub enum SessionMode {
+ /// A Positron console session: plots belong in the Plots pane.
+ Console,
+ /// A Positron notebook session: plots belong in the cell.
+ Notebook,
+ /// A Positron background session, attached to no UI at all. Output has
+ /// nowhere special to go, so it is treated exactly like a session Positron
+ /// is not driving.
+ Background,
+}
+
+/// Where a plot this kernel produces is meant to end up.
///
-/// Three render targets, identified by the Jupyter session id on the
-/// incoming execute_request:
+/// The distinction is not cosmetic: Positron routes a plot comm to the Plots
+/// pane whatever kind of session opened it, so a notebook that used the comm
+/// would put its picture in the pane and leave the cell empty. Console and
+/// notebook therefore need different output paths, and this is what tells them
+/// apart.
///
-/// - **Positron notebook** (`ggsql-notebook-…`): inline code-chunk output
-/// in an editor view. Rendered into a plain 400px container that watches
-/// layout only when the first measurement collapsed, because Positron
-/// animates the slot during its reveal transition.
-/// - **Positron console** (`ggsql-…`): output lands in the Plots pane. The
+/// - **`PositronConsole`**: output lands in the Plots pane. The Vega-Lite
/// container upgrades to `100vh` inside `.positron-output-container`, so
/// Vega-Lite's own container observer tracks pane resizes.
-/// - **Standalone** (anything else — Jupyter notebook, Quarto render, …):
-/// the HTML embeds in a static document. An outer/inner div wrapper with
-/// a 450px design width applies a uniform CSS-transform scale when the
-/// viewport is narrower, so the plot shrinks in proportion instead of
-/// squashing.
+/// - **`PositronNotebook`**: inline code-chunk output in an editor view.
+/// Rendered into a plain 400px container that watches layout only when the
+/// first measurement collapsed, because Positron animates the slot during
+/// its reveal transition.
+/// - **`Standalone`**: anything else — Jupyter, Quarto, nbconvert, and a
+/// Positron *background* session, which is attached to no UI. The HTML
+/// embeds in a static document. An outer/inner div wrapper with a 450px
+/// design width applies a uniform CSS-transform scale when the viewport is
+/// narrower, so the plot shrinks in proportion instead of squashing.
+#[derive(Default, Debug, Clone, Copy, PartialEq, Eq)]
+pub enum SessionKind {
+ PositronConsole,
+ PositronNotebook,
+ #[default]
+ Standalone,
+}
+
+impl SessionKind {
+ /// Classify a session, preferring what the frontend declared.
+ ///
+ /// `mode` comes from `--session-mode` and is authoritative: a frontend that
+ /// passes it knows what it launched. The session-id heuristic is the
+ /// fallback for external Jupyter and Quarto, which pass nothing, and for
+ /// older versions of the extension that predate the flag.
+ pub fn resolve(session: &str, mode: Option) -> Self {
+ match mode {
+ Some(SessionMode::Console) => Self::PositronConsole,
+ Some(SessionMode::Notebook) => Self::PositronNotebook,
+ // A background session has no pane and no cell, so there is no
+ // Positron-specific slot to render into.
+ Some(SessionMode::Background) => Self::Standalone,
+ // Positron's supervisor tags every session it manages with a
+ // `ggsql-` prefix; standalone Jupyter/Quarto uses UUIDs without
+ // one. A session that is not Positron's is standalone whatever
+ // else its id says.
+ None if !session.starts_with("ggsql-") => Self::Standalone,
+ None if session.contains("notebook") => Self::PositronNotebook,
+ None => Self::PositronConsole,
+ }
+ }
+
+ /// Whether the frontend is Positron, in either of its two shapes.
+ pub fn is_positron(self) -> bool {
+ matches!(self, Self::PositronConsole | Self::PositronNotebook)
+ }
+
+ /// Whether output belongs in a notebook cell rather than a pane.
+ pub fn is_notebook(self) -> bool {
+ matches!(self, Self::PositronNotebook)
+ }
+}
+
+/// Frontend-supplied hints about the output rendering slot.
#[derive(Default, Debug, Clone, Copy)]
pub struct RenderHints {
- pub is_notebook: bool,
- pub is_positron: bool,
+ pub kind: SessionKind,
pub output_width_px: Option,
}
impl RenderHints {
- pub fn from_request(header: &MessageHeader, content: &Value) -> Self {
- let session = header.session.as_str();
- // Positron's supervisor tags every session it manages with a
- // `ggsql-` prefix; standalone Jupyter/Quarto uses UUIDs without one.
- let is_positron = session.starts_with("ggsql-");
- let is_notebook = session.contains("notebook");
+ pub fn from_request(
+ header: &MessageHeader,
+ content: &Value,
+ mode: Option,
+ ) -> Self {
let output_width_px = content
.get("positron")
.and_then(|p| p.get("output_width_px"))
.and_then(|v| v.as_u64())
.and_then(|v| u32::try_from(v).ok());
Self {
- is_notebook,
- is_positron,
+ kind: SessionKind::resolve(header.session.as_str(), mode),
output_width_px,
}
}
@@ -128,8 +191,8 @@ pub fn vegalite_html(spec: &str, hints: &RenderHints) -> String {
.as_millis();
let vis_id = format!("vis-{}", timestamp);
- if hints.is_positron {
- positron_vegalite_html(&spec_json, &vis_id, hints.is_notebook)
+ if hints.kind.is_positron() {
+ positron_vegalite_html(&spec_json, &vis_id, hints.kind.is_notebook())
} else {
standalone_vegalite_html(&spec_json, &vis_id)
}
@@ -453,16 +516,14 @@ mod tests {
fn positron_console() -> RenderHints {
RenderHints {
- is_notebook: false,
- is_positron: true,
+ kind: SessionKind::PositronConsole,
output_width_px: None,
}
}
fn positron_notebook() -> RenderHints {
RenderHints {
- is_notebook: true,
- is_positron: true,
+ kind: SessionKind::PositronNotebook,
output_width_px: Some(589),
}
}
@@ -609,23 +670,79 @@ mod tests {
);
}
- #[test]
- fn test_from_request_detects_positron_sessions() {
- let header = |session: &str| MessageHeader {
+ fn header(session: &str) -> MessageHeader {
+ MessageHeader {
msg_id: String::new(),
session: session.to_string(),
username: String::new(),
date: String::new(),
msg_type: String::new(),
version: String::new(),
- };
- let console = RenderHints::from_request(&header("ggsql-c2a5a97b"), &json!({}));
- assert!(console.is_positron && !console.is_notebook);
+ }
+ }
+
+ fn kind(session: &str, mode: Option) -> SessionKind {
+ RenderHints::from_request(&header(session), &json!({}), mode).kind
+ }
+
+ #[test]
+ fn test_from_request_detects_positron_sessions() {
+ // The fallback path, for a frontend that passes no `--session-mode`.
+ assert_eq!(kind("ggsql-c2a5a97b", None), SessionKind::PositronConsole);
+ assert_eq!(
+ kind("ggsql-notebook-abc", None),
+ SessionKind::PositronNotebook
+ );
+ assert_eq!(kind("abcd-efgh-1234", None), SessionKind::Standalone);
+ }
+
+ #[test]
+ fn test_session_mode_overrides_the_heuristic() {
+ // A frontend that declares itself is believed, whatever its session id
+ // happens to look like — the id is a guess, the flag is a statement.
+ assert_eq!(
+ kind("abcd-efgh-1234", Some(SessionMode::Console)),
+ SessionKind::PositronConsole
+ );
+ assert_eq!(
+ kind("ggsql-c2a5a97b", Some(SessionMode::Notebook)),
+ SessionKind::PositronNotebook
+ );
+ assert_eq!(
+ kind("ggsql-notebook-abc", Some(SessionMode::Console)),
+ SessionKind::PositronConsole
+ );
+ }
- let notebook = RenderHints::from_request(&header("ggsql-notebook-abc"), &json!({}));
- assert!(notebook.is_positron && notebook.is_notebook);
+ #[test]
+ fn test_a_background_session_has_no_positron_slot() {
+ // It is Positron's session, but attached to no UI — so the heuristic's
+ // answer (console, from the `ggsql-` prefix) would aim output at a
+ // pane that is not showing it.
+ assert_eq!(
+ kind("ggsql-bg-4471", Some(SessionMode::Background)),
+ SessionKind::Standalone
+ );
+ assert_eq!(kind("ggsql-bg-4471", None), SessionKind::PositronConsole);
+ }
- let standalone = RenderHints::from_request(&header("abcd-efgh-1234"), &json!({}));
- assert!(!standalone.is_positron && !standalone.is_notebook);
+ #[test]
+ fn test_a_non_positron_session_is_standalone_whatever_its_id_says() {
+ // The old heuristic set `is_notebook` from the id alone, so a
+ // standalone session whose id happened to contain "notebook" carried a
+ // flag the standalone template never read. Now there is one answer.
+ assert_eq!(kind("jupyter-notebook-9f2c", None), SessionKind::Standalone);
+ assert!(!SessionKind::Standalone.is_positron());
+ assert!(!SessionKind::Standalone.is_notebook());
+ }
+
+ #[test]
+ fn test_the_two_positron_kinds_pick_different_templates() {
+ let spec = r#"{"mark":"point"}"#;
+ let console = vegalite_html(spec, &positron_console());
+ let notebook = vegalite_html(spec, &positron_notebook());
+ // The console template alone reaches for the Plots pane.
+ assert!(console.contains("positron-output-container"));
+ assert!(!notebook.contains("positron-output-container"));
}
}
diff --git a/ggsql-jupyter/src/kernel.rs b/ggsql-jupyter/src/kernel.rs
index 1737d9e6..43bd50d9 100644
--- a/ggsql-jupyter/src/kernel.rs
+++ b/ggsql-jupyter/src/kernel.rs
@@ -5,7 +5,7 @@
use crate::connection;
use crate::data_explorer::{DataExplorerState, RpcResponse};
-use crate::display::{format_display_data, RenderHints};
+use crate::display::{format_display_data, RenderHints, SessionMode};
use crate::executor::{self, ExecutionResult, QueryExecutor};
use crate::message::{ConnectionInfo, JupyterMessage, MessageHeader};
use anyhow::Result;
@@ -29,6 +29,9 @@ pub struct KernelServer {
connection: ConnectionInfo,
executor: QueryExecutor,
session: String,
+ /// What the frontend declared this session to be, if it declared anything.
+ /// `None` leaves classification to the session-id heuristic.
+ session_mode: Option,
execution_count: u32,
key: Vec,
// Positron comm IDs
@@ -41,7 +44,11 @@ pub struct KernelServer {
impl KernelServer {
/// Create a new kernel server from connection info
- pub async fn new(connection: ConnectionInfo, reader_uri: &str) -> Result {
+ pub async fn new(
+ connection: ConnectionInfo,
+ reader_uri: &str,
+ session_mode: Option,
+ ) -> Result {
tracing::info!("Initializing kernel server");
// Initialize sockets
@@ -92,6 +99,7 @@ impl KernelServer {
connection,
executor,
session,
+ session_mode,
execution_count: 0,
key,
variables_comm_id: None,
@@ -288,13 +296,13 @@ impl KernelServer {
let content = &parent.content;
let code = content["code"].as_str().unwrap_or("");
let silent = content["silent"].as_bool().unwrap_or(false);
- let hints = RenderHints::from_request(&parent.header, content);
+ let hints = RenderHints::from_request(&parent.header, content, self.session_mode);
tracing::info!(
- "Executing code ({} chars, silent={}, notebook={}, width_px={:?})",
+ "Executing code ({} chars, silent={}, session={:?}, width_px={:?})",
code.len(),
silent,
- hints.is_notebook,
+ hints.kind,
hints.output_width_px
);
diff --git a/ggsql-jupyter/src/main.rs b/ggsql-jupyter/src/main.rs
index fccb8906..7a4278e7 100644
--- a/ggsql-jupyter/src/main.rs
+++ b/ggsql-jupyter/src/main.rs
@@ -10,6 +10,7 @@ mod kernel;
mod message;
use anyhow::{Context, Result};
use clap::Parser;
+use display::SessionMode;
use message::ConnectionInfo;
use std::env;
use std::fs;
@@ -27,6 +28,14 @@ struct Args {
#[arg(long, default_value = "duckdb://memory")]
reader: String,
+ /// What kind of session this is, when the frontend knows.
+ ///
+ /// Only a frontend creating the session can say — in practice the ggsql
+ /// extension. Left unset, the kernel classifies the session from its id,
+ /// which is what external Jupyter and Quarto rely on.
+ #[arg(long, value_enum)]
+ session_mode: Option,
+
/// Install the kernel spec
#[arg(long)]
install: bool,
@@ -74,7 +83,7 @@ async fn main() -> Result<()> {
tracing::info!("Creating kernel server");
// Create and run kernel
- let mut kernel = kernel::KernelServer::new(connection, &args.reader).await?;
+ let mut kernel = kernel::KernelServer::new(connection, &args.reader, args.session_mode).await?;
tracing::info!("Kernel ready, starting event loop");
diff --git a/ggsql-vscode/src/manager.ts b/ggsql-vscode/src/manager.ts
index 5c781118..101e6814 100644
--- a/ggsql-vscode/src/manager.ts
+++ b/ggsql-vscode/src/manager.ts
@@ -200,13 +200,31 @@ function generateMetadata(
/**
* Create a Jupyter kernel spec for ggsql-jupyter
*
+ * `--session-mode` tells the kernel where its output is meant to go, which it
+ * cannot work out for itself: a plot comm always lands in the Plots pane, so a
+ * notebook session that used one would leave its cell empty. Only we know,
+ * because we are the ones creating the session. Left off, the kernel guesses
+ * from the session id — which is what external Jupyter and Quarto rely on, and
+ * why `writeKernelJson` deliberately does not pass it.
+ *
* @param kernelPath - Path to the ggsql-jupyter executable
+ * @param readerUri - Data source the kernel should open, if not the default
+ * @param sessionMode - What kind of session this is, when known
*/
-function createKernelSpec(kernelPath: string, readerUri?: string): JupyterKernelSpec {
+function createKernelSpec(
+ kernelPath: string,
+ readerUri?: string,
+ sessionMode?: positron.LanguageRuntimeSessionMode
+): JupyterKernelSpec {
const argv = [kernelPath, '-f', '{connection_file}'];
if (readerUri) {
argv.push('--reader', readerUri);
}
+ if (sessionMode) {
+ // The enum's values are already the kernel's spelling (`console`,
+ // `notebook`, `background`), so there is nothing to translate.
+ argv.push('--session-mode', sessionMode);
+ }
return {
argv,
@@ -420,7 +438,11 @@ export class GgsqlRuntimeManager implements positron.LanguageRuntimeManager {
const supervisorApi = await getSupervisorApi();
// Create the kernel spec using the runtime's kernel path
- const kernelSpec = createKernelSpec(runtimeMetadata.runtimePath);
+ const kernelSpec = createKernelSpec(
+ runtimeMetadata.runtimePath,
+ undefined,
+ sessionMetadata.sessionMode
+ );
const dynState = createDynState();
@@ -450,6 +472,9 @@ export class GgsqlRuntimeManager implements positron.LanguageRuntimeManager {
const dynState = createDynState(sessionName);
+ // No kernel spec here on purpose: the supervisor replays the argv the
+ // session was created with, and a session's mode never changes, so the
+ // restored kernel keeps the `--session-mode` it started with.
// Re-advertise this kernel on restore
ensureKernelSpecInstalled(runtimeMetadata.runtimePath);
From 833e21b555da421b3ebef4e42bc1a5f186cf4139 Mon Sep 17 00:00:00 2001
From: Thomas Lin Pedersen
Date: Sat, 5 Sep 2026 16:06:44 +0200
Subject: [PATCH 05/21] Move rendering to thread
---
ggsql-jupyter/src/display.rs | 51 ++++++++++++++++++--------
ggsql-jupyter/src/executor.rs | 67 +++++++++++++++++++++++++----------
ggsql-jupyter/src/kernel.rs | 2 +-
3 files changed, 87 insertions(+), 33 deletions(-)
diff --git a/ggsql-jupyter/src/display.rs b/ggsql-jupyter/src/display.rs
index d38df5e2..303bf21a 100644
--- a/ggsql-jupyter/src/display.rs
+++ b/ggsql-jupyter/src/display.rs
@@ -5,7 +5,10 @@
use crate::executor::ExecutionResult;
use crate::message::MessageHeader;
+use anyhow::Result;
use clap::ValueEnum;
+use ggsql::reader::Spec;
+use ggsql::writer::{VegaLiteWriter, Writer};
use ggsql::DataFrame;
use serde_json::{json, Value};
@@ -132,19 +135,22 @@ impl RenderHints {
/// "transient": { ... }
/// }
/// ```
-pub fn format_display_data(result: ExecutionResult, hints: &RenderHints) -> Option {
+pub fn format_display_data(result: ExecutionResult, hints: &RenderHints) -> Result> {
match result {
- ExecutionResult::Visualization { spec } => Some(format_vegalite(spec, hints)),
+ // Rendering can now fail, because it happens here rather than at
+ // execution time — which is the point: the format is chosen where the
+ // destination is known.
+ ExecutionResult::Visualization(spec) => Ok(Some(format_vegalite(&spec, hints)?)),
ExecutionResult::DataFrame(df) => {
// DDL statements return DataFrames with 0 columns - don't display anything
if df.width() == 0 {
- None
+ Ok(None)
} else {
- Some(format_dataframe(df))
+ Ok(Some(format_dataframe(df)))
}
}
ExecutionResult::ConnectionChanged { display_name, .. } => {
- Some(format_connection_changed(&display_name))
+ Ok(Some(format_connection_changed(&display_name)))
}
}
}
@@ -161,10 +167,11 @@ fn format_connection_changed(display_name: &str) -> Value {
})
}
-/// Format Vega-Lite visualization as display_data
-fn format_vegalite(spec: String, hints: &RenderHints) -> Value {
- let html = vegalite_html(&spec, hints);
- json!({
+/// Render a resolved plot as Vega-Lite and wrap it as display_data.
+fn format_vegalite(spec: &Spec, hints: &RenderHints) -> Result {
+ let json = VegaLiteWriter::new().render(spec)?;
+ let html = vegalite_html(&json, hints);
+ Ok(json!({
"data": {
"text/html": html,
"text/plain": "Vega-Lite visualization".to_string()
@@ -172,7 +179,7 @@ fn format_vegalite(spec: String, hints: &RenderHints) -> Value {
"metadata": {},
"transient": {},
"output_location": "plot"
- })
+ }))
}
/// Generate the HTML wrapper that embeds a Vega-Lite spec via vega-embed.
@@ -465,15 +472,31 @@ fn escape_html(s: &str) -> String {
mod tests {
use super::*;
+ /// A resolved plot, from a real query — the display layer renders it now,
+ /// so a hand-written Vega-Lite string is no longer a stand-in for one.
+ fn a_spec() -> Spec {
+ use ggsql::reader::{DuckDBReader, Reader};
+ DuckDBReader::from_connection_string("duckdb://memory")
+ .unwrap()
+ .execute("SELECT 1 AS x, 2 AS y VISUALISE x, y DRAW point")
+ .unwrap()
+ }
+
#[test]
fn test_vegalite_format() {
- let spec = r#"{"mark": "point"}"#.to_string();
- let result = ExecutionResult::Visualization { spec };
+ let result = ExecutionResult::Visualization(Box::new(a_spec()));
let display = format_display_data(result, &RenderHints::default())
+ .expect("rendering should succeed")
.expect("Visualization should return Some");
assert!(display["data"]["text/html"].is_string());
assert!(display["data"]["text/plain"].is_string());
+ // Still routed to the Plots pane, and still a vega-embed payload —
+ // the wire format is unchanged by moving the render here.
+ assert_eq!(display["output_location"], "plot");
+ let html = display["data"]["text/html"].as_str().unwrap();
+ assert!(html.contains("vega-embed"), "{html:.200}");
+ assert!(html.contains("\"mark\""), "the spec should be embedded");
}
#[test]
@@ -481,7 +504,7 @@ mod tests {
// DDL statements return DataFrames with 0 columns
let df = DataFrame::empty();
let result = ExecutionResult::DataFrame(df);
- let display = format_display_data(result, &RenderHints::default());
+ let display = format_display_data(result, &RenderHints::default()).unwrap();
assert!(
display.is_none(),
@@ -498,7 +521,7 @@ mod tests {
let empty: ArrayRef = Arc::new(Int32Array::from(Vec::::new()));
let df = DataFrame::new(vec![("x", empty)]).unwrap();
let result = ExecutionResult::DataFrame(df);
- let display = format_display_data(result, &RenderHints::default());
+ let display = format_display_data(result, &RenderHints::default()).unwrap();
assert!(
display.is_some(),
diff --git a/ggsql-jupyter/src/executor.rs b/ggsql-jupyter/src/executor.rs
index 6f928e7a..e201810f 100644
--- a/ggsql-jupyter/src/executor.rs
+++ b/ggsql-jupyter/src/executor.rs
@@ -8,26 +8,64 @@ use anyhow::Result;
use ggsql::{
reader::{
connection::{extract_odbc_value, parse_connection_string},
- DuckDBReader, Reader,
+ DuckDBReader, Reader, Spec,
},
validate::validate,
- writer::{VegaLiteWriter, Writer},
DataFrame,
};
+/// A resolved plot has to reach a render thread, so the design rests on this.
+const _: () = {
+ fn assert_send() {}
+ let _ = assert_send::;
+};
+
/// Result of executing a ggsql query
-#[derive(Debug)]
pub enum ExecutionResult {
/// Pure SQL query with no visualization
DataFrame(DataFrame),
- /// Query with visualization specification
- Visualization {
- spec: String, // Vega-Lite JSON
- },
+ /// A query carrying a `VISUALISE` clause, as the resolved plot rather than
+ /// as rendered output.
+ ///
+ /// **Deliberately not pre-rendered.** Which format this becomes depends on
+ /// where the output is going and what the frontend asked for — and, once a
+ /// plot comm is open, is asked again on every resize. Rendering here would
+ /// mean guessing a size and a format at execution time and being unable to
+ /// revise either.
+ ///
+ /// Boxed because a `Spec` carries the post-stat DataFrames and dwarfs the
+ /// other variants.
+ Visualization(Box),
/// Connection changed via meta-command
ConnectionChanged { uri: String, display_name: String },
}
+// `Spec` is neither `Debug` nor `Clone`, so this summarises rather than
+// deriving. What a log wants from a result is its shape and size anyway.
+impl std::fmt::Debug for ExecutionResult {
+ fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+ match self {
+ Self::DataFrame(df) => f
+ .debug_struct("DataFrame")
+ .field("rows", &df.height())
+ .field("columns", &df.width())
+ .finish(),
+ Self::Visualization(spec) => {
+ let metadata = spec.metadata();
+ f.debug_struct("Visualization")
+ .field("rows", &metadata.rows)
+ .field("layers", &metadata.layer_count)
+ .finish()
+ }
+ Self::ConnectionChanged { uri, display_name } => f
+ .debug_struct("ConnectionChanged")
+ .field("uri", uri)
+ .field("display_name", display_name)
+ .finish(),
+ }
+ }
+}
+
/// Create a reader from a connection URI string.
///
/// Supported schemes:
@@ -148,7 +186,6 @@ pub fn parse_meta_command(code: &str) -> Option {
/// Query executor maintaining persistent database connection
pub struct QueryExecutor {
reader: Box,
- writer: VegaLiteWriter,
reader_uri: String,
}
@@ -157,11 +194,9 @@ impl QueryExecutor {
pub fn new_with_uri(uri: &str) -> Result {
tracing::info!("Initializing query executor with reader: {}", uri);
let reader = create_reader(uri)?;
- let writer = VegaLiteWriter::new();
Ok(Self {
reader,
- writer,
reader_uri: uri.to_string(),
})
}
@@ -231,13 +266,9 @@ impl QueryExecutor {
spec.metadata().layer_count
);
- // 4. Render to output format
- let vega_json = self.writer.render(&spec)?;
-
- tracing::debug!("Generated Vega-Lite spec: {} chars", vega_json.len());
-
- // 5. Return result
- Ok(ExecutionResult::Visualization { spec: vega_json })
+ // 4. Hand back the resolved plot. Choosing a format is the display
+ // layer's job, because only it knows where the output is going.
+ Ok(ExecutionResult::Visualization(Box::new(spec)))
}
}
@@ -251,7 +282,7 @@ mod tests {
let code = "SELECT 1 as x, 2 as y VISUALISE x, y DRAW point";
let result = executor.execute(code).unwrap();
- assert!(matches!(result, ExecutionResult::Visualization { .. }));
+ assert!(matches!(result, ExecutionResult::Visualization(_)));
}
#[test]
diff --git a/ggsql-jupyter/src/kernel.rs b/ggsql-jupyter/src/kernel.rs
index 43bd50d9..debf2f25 100644
--- a/ggsql-jupyter/src/kernel.rs
+++ b/ggsql-jupyter/src/kernel.rs
@@ -343,7 +343,7 @@ impl KernelServer {
// Per Jupyter spec: execute_result includes execution_count
// Only send if there's something to display (DDL returns None)
if !silent && !is_connection_changed {
- if let Some(display_data) = format_display_data(exec_result, &hints) {
+ if let Some(display_data) = format_display_data(exec_result, &hints)? {
// Build message content, including output_location if present
let mut content = json!({
"execution_count": self.execution_count,
From 21a96463ad02c2943cde8039c1331d0637b5ef11 Mon Sep 17 00:00:00 2001
From: Thomas Lin Pedersen
Date: Mon, 7 Sep 2026 09:42:15 +0200
Subject: [PATCH 06/21] First part of the kernel render
---
CHANGELOG.md | 21 ++
Cargo.lock | 1 +
Cargo.toml | 1 +
ggsql-jupyter/CLAUDE.md | 68 ++++-
ggsql-jupyter/Cargo.toml | 17 +-
ggsql-jupyter/src/display.rs | 228 +++++++++++++++--
ggsql-jupyter/src/kernel.rs | 8 +-
ggsql-jupyter/src/lib.rs | 1 +
ggsql-jupyter/src/main.rs | 1 +
ggsql-jupyter/src/plot/backend.rs | 315 ++++++++++++++++++++++++
ggsql-jupyter/src/plot/mod.rs | 193 +++++++++++++++
ggsql-jupyter/src/plot/quarto.rs | 140 +++++++++++
ggsql-jupyter/src/plot/sizing.rs | 171 +++++++++++++
ggsql-jupyter/tests/test_compliance.py | 21 +-
ggsql-jupyter/tests/test_integration.py | 33 ++-
15 files changed, 1184 insertions(+), 35 deletions(-)
create mode 100644 ggsql-jupyter/src/plot/backend.rs
create mode 100644 ggsql-jupyter/src/plot/mod.rs
create mode 100644 ggsql-jupyter/src/plot/quarto.rs
create mode 100644 ggsql-jupyter/src/plot/sizing.rs
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 81feff03..28635a8a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -67,6 +67,27 @@
the png writer draws them.
### Changed
+- **Plots in notebooks and documents are now rendered by the kernel and no
+ longer need network access.** A `VISUALISE` query in JupyterLab, in a Positron
+ notebook, or in a Quarto render used to emit HTML that fetched vega, vega-lite
+ and vega-embed from a CDN on every render; it now emits a rendered image. So
+ plots work offline, in CI and behind a firewall, each output is a fraction of
+ the size, and nothing depends on a third-party host staying up.
+
+ **Quarto is obeyed rather than guessed at.** `QUARTO_FIG_FORMAT` selects the
+ writer (`png`, `jpeg`, `svg`, `pdf`), and `QUARTO_FIG_WIDTH`/`_HEIGHT` are
+ read as inches at `QUARTO_FIG_DPI` — so `fig-width: 6` finally means six
+ inches, and a PDF document gets a real vector figure with selectable text and
+ embedded fonts instead of a rasterised screenshot.
+
+ **A GPU is needed for raster output, not to see a plot.** Without an adapter,
+ or in a build without the new non-default `raster-plots` feature, plots render
+ as SVG — carrying the same resolved scales, breaks and labels, and needing
+ neither wgpu nor an adapter.
+
+ Two things are lost with vega-embed, and worth knowing: a static image has no
+ tooltips, no pan/zoom and no save-as menu. Positron's Plots pane supplies its
+ own, so the loss is felt mainly in plain Jupyter and Quarto HTML.
- `--writer` now lists every format ggsql knows in its long help, marking the
ones the running build does not have and naming the feature that would bring
each in — the more common mistake than a misspelled name. `-D`'s long help
diff --git a/Cargo.lock b/Cargo.lock
index e713a1ec..656946f8 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2554,6 +2554,7 @@ version = "0.4.1"
dependencies = [
"anyhow",
"arrow",
+ "base64",
"bytes",
"chrono",
"clap",
diff --git a/Cargo.toml b/Cargo.toml
index beaa88a3..7a856903 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -70,6 +70,7 @@ chrono = "0.4"
rand = "0.8"
const_format = "0.2"
uuid = { version = "1.0", features = ["v4"] }
+base64 = "0.22"
tokio = { version = "1.35", default-features = false }
tracing = "0.1"
tracing-subscriber = { version = "0.3", features = ["env-filter"] }
diff --git a/ggsql-jupyter/CLAUDE.md b/ggsql-jupyter/CLAUDE.md
index 590e12d3..f9dad78f 100644
--- a/ggsql-jupyter/CLAUDE.md
+++ b/ggsql-jupyter/CLAUDE.md
@@ -33,7 +33,7 @@ ggsql-jupyter/
1. `ggsql-jupyter --install` writes a kernelspec into the active Python environment (Jupyter, conda, uv, virtualenv — auto-detected).
2. `ggsql-jupyter ` is the entry point Jupyter invokes; it reads the connection JSON, opens the five ZMQ sockets (shell, control, iopub, stdin, heartbeat), and runs `kernel.rs`'s message loop.
3. Each `execute_request` is dispatched through `executor.rs` → `ggsql::reader::DuckDBReader::execute(...)`. The kernel keeps a single persistent in-memory DuckDB session so cells share state.
-4. The result is wrapped by `display.rs` into a Jupyter `display_data` message — Vega-Lite specs go through vega-embed in an HTML payload (works in classic Jupyter, JupyterLab, and Positron); pure SQL goes out as an HTML table.
+4. The result is wrapped by `display.rs` into a Jupyter message. A plot is **rendered here, in the kernel** (see [Rendering](#rendering)); pure SQL goes out as an HTML table.
## Where output goes: `SessionKind`
@@ -54,9 +54,73 @@ ggsql-jupyter/
Two places deliberately **do not** pass the flag. `writeKernelJson` and `ggsql-jupyter --install` write kernelspecs for *external* frontends, which are exactly the ones that should classify as `Standalone`. And `restoreSession` doesn't rebuild the spec at all — the supervisor replays the argv the session was created with, and a session's mode never changes.
+## Rendering
+
+Plots are rendered in the kernel and travel as images. **Nothing fetches a renderer from a CDN**, so a plot works offline, in CI, and behind a firewall — which the previous vega-embed payload could not do.
+
+`plot/` holds the whole of it:
+
+| File | Role |
+| --- | --- |
+| `plot/mod.rs` | `Format`, `RenderRequest`, and `choose` — the one function that decides what a plot becomes |
+| `plot/backend.rs` | `PlotBackend`: the render thread, and the GPU probe |
+| `plot/sizing.rs` | `Canvas`: logical size × device pixel ratio → device pixels + dpi |
+| `plot/quarto.rs` | `QUARTO_FIG_*` → a format and a canvas |
+
+### `choose`
+
+Three things have to agree — where the output is going, what this build and machine can produce, and what the frontend asked for — so they are reconciled in one readable function rather than spread through the formatting code:
+
+| `SessionKind` | Result |
+| --- | --- |
+| `PositronConsole` | The Vega-Lite payload, still — **until the plot comm replaces it** |
+| `PositronNotebook` | A static image bundle in the cell |
+| `Standalone` | What `QUARTO_FIG_FORMAT` asked for, else a static image |
+
+**SVG is the fallback wherever raster output is unavailable** — no GPU adapter, or a build without `raster-plots`. That is why `ggsql/svg` and `ggsql/pdf` are *non-optional* dependencies while the raster formats are behind a feature: the path that always works must always be compiled in, and never the one you have to opt into. It costs nothing to hold that line, since the vector writers pull in no wgpu.
+
+### The render thread
+
+`kernel.rs` awaits `handle_shell_message` **inline** in its `select!`, so anything blocking there stalls the heartbeat, the control channel and the SIGINT handler alike. So `PlotBackend` owns a thread, probes for an adapter once at startup (10 s ceiling), and keeps **one** renderer for the session, which handles a changing frame size internally.
+
+The probe is eager rather than lazy because a lazy one would leave the *first* plot unable to choose a path.
+
+### What the cold start actually costs
+
+Measured on a release build, Apple GPU, vello-hybrid:
+
+| | warm | cold (first process after a build) |
+| --- | --- | --- |
+| `RasterRenderer::new()` | 14 ms | ~185 ms |
+| **first render** | **~85 ms** | **~1.35 s** |
+| later renders, 3-point plot at 1200×800 | 5 ms | 5 ms |
+| later renders, 50k points | ~200 ms | ~200 ms |
+| a render at a size not seen before | 9–22 ms | — |
+
+**Constructing the renderer is not the expensive part — the first render is**, and most of that is text: parley/fontique enumerating and loading system faces. Rendering an SVG first (no GPU, same text work) drops the first raster render from ~85 ms to ~20 ms, which is what identifies the cost. It is per *process*, not per renderer, so the SVG fallback pays it too.
+
+That is why the thread renders a **throwaway 64×64 SVG frame at startup**, before anything is waiting on it: with the warm-up, the first plot of a session renders in ~14 ms rather than ~85 ms, and far better than that on a genuinely cold start. `backend::warm_up` builds its own in-memory database to do it — never the session's reader, since executing a query through that would materialise ggsql's internal views in the user's session.
+
+Per-render cost is otherwise small enough that blocking the message loop on it is acceptable at this stage; the reason to move renders off it entirely is the interactive path, where a resize asks for a frame per drag event.
+
+### Sizing
+
+`Canvas::from_logical` scales pixels **and** dpi by the device pixel ratio together. Scaling the pixels alone renders the same chrome into more pixels — a blurry plot at the right size; scaling dpi alone grows the chrome instead of the resolution. This matches matplotlib's Positron backend. `metadata[mime].width/height` then carries the CSS size to display at, so a 2× render appears sharp rather than twice as big.
+
+**Two different channels report size, and they report different things:**
+
+| Channel | Carries | Sizes |
+| --- | --- | --- |
+| `execute_request`'s `positron` dict | `output_width_px`, `output_pixel_ratio` | A **cell output** slot — as wide as the cell, as tall as whatever it is given |
+| plot comm `render` params, and the ui comm's `did_change_plots_render_settings` | a required `{width, height}` plus `pixel_ratio` and `format` | The **Plots pane**, which is why a plot in the pane fits it exactly |
+
+So `RenderHints::canvas` picks a height (golden ratio, close to ggplot2's default figure) because a cell genuinely reports none — while the pane never comes through that function at all, since its size arrives per render rather than per execution.
+
+**A static bundle carries no `output_location`.** That key routes an output to Positron's plot widget, which would show the picture in the Plots pane *as well as* in the cell — one plot arriving twice.
+
## Positron-specific bits
-- Kernel info advertises `"output_location": "plot"` so visualizations route to Positron's Plot pane.
+- The Vega-Lite console payload carries `"output_location": "plot"` so it routes to Positron's Plots pane. A static image bundle deliberately does not — see above.
- `data_explorer.rs` implements Positron's data-explorer comm channel (registered query results become explorable tables).
- The companion VS Code extension (`ggsql-vscode/`) discovers this binary via the `ggsql.kernelPath` setting, the active Jupyter kernelspec, or `PATH`.
diff --git a/ggsql-jupyter/Cargo.toml b/ggsql-jupyter/Cargo.toml
index 6be601ea..7dac14d8 100644
--- a/ggsql-jupyter/Cargo.toml
+++ b/ggsql-jupyter/Cargo.toml
@@ -18,8 +18,12 @@ name = "ggsql_jupyter"
path = "src/lib.rs"
[dependencies]
-# Core ggsql library
-ggsql = { workspace = true, features = ["duckdb", "vegalite"] }
+# Core ggsql library.
+#
+# `svg` and `pdf` are not optional: SVG is the fallback whenever raster output
+# is unavailable, so the path that always works must always be compiled in.
+# They cost no GPU stack and no wgpu, which is what makes that affordable.
+ggsql = { workspace = true, features = ["duckdb", "vegalite", "svg", "pdf"] }
# Arrow for DataFrame array types
arrow = { workspace = true }
@@ -57,6 +61,9 @@ hex = "0.4"
# UUID for message IDs
uuid = { version = "1.0", features = ["v4"] }
+# Binary output travels base64-encoded in a display bundle
+base64 = { workspace = true }
+
[features]
default = ["all-readers"]
all-readers = ["sqlite", "odbc", "duckdb"]
@@ -64,5 +71,11 @@ odbc = ["ggsql/odbc"]
sqlite = ["ggsql/sqlite"]
duckdb = ["ggsql/duckdb"]
+# The raster plot formats, which need a GPU adapter at render time and the wgpu
+# stack at build time. Non-default on purpose: the SVG fallback is what a build
+# without them uses, so the path that always works is never the one that has to
+# be opted into.
+raster-plots = ["ggsql/png", "ggsql/jpeg"]
+
[dev-dependencies]
tempfile = "3.8"
diff --git a/ggsql-jupyter/src/display.rs b/ggsql-jupyter/src/display.rs
index 303bf21a..27303b81 100644
--- a/ggsql-jupyter/src/display.rs
+++ b/ggsql-jupyter/src/display.rs
@@ -5,7 +5,10 @@
use crate::executor::ExecutionResult;
use crate::message::MessageHeader;
+use crate::plot::{self, Canvas, Delivery, PlotBackend, RenderRequest};
use anyhow::Result;
+use base64::engine::general_purpose::STANDARD as BASE64;
+use base64::Engine;
use clap::ValueEnum;
use ggsql::reader::Spec;
use ggsql::writer::{VegaLiteWriter, Writer};
@@ -97,7 +100,10 @@ impl SessionKind {
#[derive(Default, Debug, Clone, Copy)]
pub struct RenderHints {
pub kind: SessionKind,
+ /// Width of the output slot in CSS pixels, when the frontend says.
pub output_width_px: Option,
+ /// Device pixel ratio of the display, when the frontend says.
+ pub pixel_ratio: Option,
}
impl RenderHints {
@@ -106,14 +112,50 @@ impl RenderHints {
content: &Value,
mode: Option,
) -> Self {
- let output_width_px = content
- .get("positron")
+ // Positron puts both of these on the execute request for a notebook
+ // or inline cell — see `runtimeNotebookKernel.ts`, which measures the
+ // output slot and reads the window's `devicePixelRatio`.
+ let positron = content.get("positron");
+ let output_width_px = positron
.and_then(|p| p.get("output_width_px"))
.and_then(|v| v.as_u64())
.and_then(|v| u32::try_from(v).ok());
+ let pixel_ratio = positron
+ .and_then(|p| p.get("output_pixel_ratio"))
+ .and_then(|v| v.as_f64())
+ .filter(|v| *v > 0.0);
Self {
kind: SessionKind::resolve(header.session.as_str(), mode),
output_width_px,
+ pixel_ratio,
+ }
+ }
+
+ /// The canvas a static render should use.
+ ///
+ /// **An execute request reports a width but no height**, because the slot
+ /// it describes is a cell output — as wide as the cell and as tall as
+ /// whatever it is given. So the height is ours to pick, and the golden
+ /// ratio is close to ggplot2's own default figure and a better answer than
+ /// a square.
+ ///
+ /// This is not how the Plots pane is sized. A pane reports a **full**
+ /// size, through the plot comm's `render` request and through the ui
+ /// comm's `did_change_plots_render_settings` — both carrying a required
+ /// `{width, height}` plus a pixel ratio — which is why a plot in the pane
+ /// fits it exactly. Neither reaches this function: the pane's size arrives
+ /// per render, not per execution.
+ pub fn canvas(&self) -> Canvas {
+ let ratio = self.pixel_ratio.unwrap_or(1.0);
+ match self.output_width_px {
+ Some(width) if width > 0 => {
+ let width = f64::from(width);
+ Canvas::from_logical(width, width / 1.618, ratio)
+ }
+ _ => {
+ let default = Canvas::default();
+ Canvas::from_logical(f64::from(default.width), f64::from(default.height), ratio)
+ }
}
}
}
@@ -135,12 +177,21 @@ impl RenderHints {
/// "transient": { ... }
/// }
/// ```
-pub fn format_display_data(result: ExecutionResult, hints: &RenderHints) -> Result> {
+pub fn format_display_data(
+ result: ExecutionResult,
+ hints: &RenderHints,
+ backend: &PlotBackend,
+) -> Result > {
match result {
// Rendering can now fail, because it happens here rather than at
// execution time — which is the point: the format is chosen where the
// destination is known.
- ExecutionResult::Visualization(spec) => Ok(Some(format_vegalite(&spec, hints)?)),
+ ExecutionResult::Visualization(spec) => {
+ match plot::choose(hints.kind, backend.raster(), hints.canvas()) {
+ Delivery::VegaLite => Ok(Some(format_vegalite(&spec, hints)?)),
+ Delivery::Static(request) => Ok(Some(format_static(spec, request, backend)?)),
+ }
+ }
ExecutionResult::DataFrame(df) => {
// DDL statements return DataFrames with 0 columns - don't display anything
if df.width() == 0 {
@@ -167,6 +218,49 @@ fn format_connection_changed(display_name: &str) -> Value {
})
}
+/// Render a plot to an image and wrap it as a static display bundle.
+///
+/// **No `output_location`.** That key routes an output to Positron's plot
+/// widget, which would show the picture in the Plots pane *as well as* putting
+/// it in the cell — one plot arriving twice. A static bundle belongs wherever
+/// the cell's output goes and nowhere else.
+///
+/// `metadata[mime].width/height` carries the size the frontend should display
+/// at, in CSS pixels. Without it a 2x render appears at twice its intended
+/// size; JupyterLab and nbconvert both honour it.
+fn format_static(spec: Box, request: RenderRequest, backend: &PlotBackend) -> Result {
+ let metadata = spec.metadata();
+ let summary = format!(
+ "",
+ metadata.layer_count,
+ if metadata.layer_count == 1 { "" } else { "s" },
+ metadata.rows,
+ if metadata.rows == 1 { "" } else { "s" },
+ );
+
+ let bytes = backend.render(spec, request)?;
+ let mime = request.format.mime();
+ // SVG is text and travels as itself; everything else is bytes and travels
+ // base64-encoded, which is what a display bundle expects for binary data.
+ let payload = if request.format.is_text() {
+ String::from_utf8(bytes)?
+ } else {
+ BASE64.encode(&bytes)
+ };
+
+ let (css_width, css_height) = request.canvas.css_size();
+ Ok(json!({
+ "data": {
+ mime: payload,
+ "text/plain": summary,
+ },
+ "metadata": {
+ mime: { "width": css_width, "height": css_height }
+ },
+ "transient": {},
+ }))
+}
+
/// Render a resolved plot as Vega-Lite and wrap it as display_data.
fn format_vegalite(spec: &Spec, hints: &RenderHints) -> Result {
let json = VegaLiteWriter::new().render(spec)?;
@@ -482,29 +576,123 @@ mod tests {
.unwrap()
}
+ fn render(hints: &RenderHints) -> Value {
+ format_display_data(
+ ExecutionResult::Visualization(Box::new(a_spec())),
+ hints,
+ &backend(),
+ )
+ .expect("rendering should succeed")
+ .expect("a visualization should produce output")
+ }
+
#[test]
- fn test_vegalite_format() {
- let result = ExecutionResult::Visualization(Box::new(a_spec()));
- let display = format_display_data(result, &RenderHints::default())
- .expect("rendering should succeed")
- .expect("Visualization should return Some");
-
- assert!(display["data"]["text/html"].is_string());
- assert!(display["data"]["text/plain"].is_string());
- // Still routed to the Plots pane, and still a vega-embed payload —
- // the wire format is unchanged by moving the render here.
+ fn test_console_still_gets_vegalite() {
+ // The console keeps the Plots-pane payload until a plot comm replaces
+ // it; switching it to a static image before then would lose the pane's
+ // resize behaviour and gain nothing.
+ let display = render(&positron_console());
assert_eq!(display["output_location"], "plot");
let html = display["data"]["text/html"].as_str().unwrap();
assert!(html.contains("vega-embed"), "{html:.200}");
assert!(html.contains("\"mark\""), "the spec should be embedded");
}
+ #[test]
+ fn test_a_notebook_gets_a_static_image_in_its_cell() {
+ let display = render(&positron_notebook());
+
+ // SVG, because this backend has no GPU — and the fallback is the point:
+ // a plot still arrives.
+ let svg = display["data"]["image/svg+xml"].as_str().unwrap();
+ assert!(svg.starts_with("::new()));
let df = DataFrame::new(vec![("x", empty)]).unwrap();
let result = ExecutionResult::DataFrame(df);
- let display = format_display_data(result, &RenderHints::default()).unwrap();
+ let display = format_display_data(result, &RenderHints::default(), &backend()).unwrap();
assert!(
display.is_some(),
@@ -537,10 +725,17 @@ mod tests {
);
}
+ /// A render backend with no GPU, so tests are fast and identical
+ /// everywhere. The SVG path it leaves is the one that always works.
+ fn backend() -> PlotBackend {
+ PlotBackend::without_raster()
+ }
+
fn positron_console() -> RenderHints {
RenderHints {
kind: SessionKind::PositronConsole,
output_width_px: None,
+ pixel_ratio: None,
}
}
@@ -548,6 +743,7 @@ mod tests {
RenderHints {
kind: SessionKind::PositronNotebook,
output_width_px: Some(589),
+ pixel_ratio: None,
}
}
diff --git a/ggsql-jupyter/src/kernel.rs b/ggsql-jupyter/src/kernel.rs
index debf2f25..ccf2012e 100644
--- a/ggsql-jupyter/src/kernel.rs
+++ b/ggsql-jupyter/src/kernel.rs
@@ -8,6 +8,7 @@ use crate::data_explorer::{DataExplorerState, RpcResponse};
use crate::display::{format_display_data, RenderHints, SessionMode};
use crate::executor::{self, ExecutionResult, QueryExecutor};
use crate::message::{ConnectionInfo, JupyterMessage, MessageHeader};
+use crate::plot::PlotBackend;
use anyhow::Result;
use hmac::{Hmac, Mac};
use serde_json::{json, Value};
@@ -28,6 +29,8 @@ pub struct KernelServer {
#[allow(dead_code)]
connection: ConnectionInfo,
executor: QueryExecutor,
+ /// The render thread, and whether it found a GPU adapter.
+ plots: PlotBackend,
session: String,
/// What the frontend declared this session to be, if it declared anything.
/// `None` leaves classification to the session-id heuristic.
@@ -98,6 +101,7 @@ impl KernelServer {
heartbeat,
connection,
executor,
+ plots: PlotBackend::spawn(),
session,
session_mode,
execution_count: 0,
@@ -343,7 +347,9 @@ impl KernelServer {
// Per Jupyter spec: execute_result includes execution_count
// Only send if there's something to display (DDL returns None)
if !silent && !is_connection_changed {
- if let Some(display_data) = format_display_data(exec_result, &hints)? {
+ if let Some(display_data) =
+ format_display_data(exec_result, &hints, &self.plots)?
+ {
// Build message content, including output_location if present
let mut content = json!({
"execution_count": self.execution_count,
diff --git a/ggsql-jupyter/src/lib.rs b/ggsql-jupyter/src/lib.rs
index c0e9c42f..7b06b096 100644
--- a/ggsql-jupyter/src/lib.rs
+++ b/ggsql-jupyter/src/lib.rs
@@ -7,6 +7,7 @@ pub mod data_explorer;
pub mod display;
pub mod executor;
pub mod message;
+pub mod plot;
// Re-export commonly used types
pub use display::format_display_data;
pub use executor::{ExecutionResult, QueryExecutor};
diff --git a/ggsql-jupyter/src/main.rs b/ggsql-jupyter/src/main.rs
index 7a4278e7..c9b5daa5 100644
--- a/ggsql-jupyter/src/main.rs
+++ b/ggsql-jupyter/src/main.rs
@@ -8,6 +8,7 @@ mod display;
mod executor;
mod kernel;
mod message;
+mod plot;
use anyhow::{Context, Result};
use clap::Parser;
use display::SessionMode;
diff --git a/ggsql-jupyter/src/plot/backend.rs b/ggsql-jupyter/src/plot/backend.rs
new file mode 100644
index 00000000..93f074d3
--- /dev/null
+++ b/ggsql-jupyter/src/plot/backend.rs
@@ -0,0 +1,315 @@
+//! The render thread.
+//!
+//! Rendering does not happen on the message loop, for one concrete reason:
+//! `kernel.rs` awaits `handle_shell_message` *inline* in its `select!`, so
+//! anything blocking there stalls the heartbeat, the control channel and the
+//! SIGINT handler alike.
+//!
+//! # What the cold start actually costs
+//!
+//! Measured on a release build, Apple GPU, vello-hybrid:
+//!
+//! | | warm | cold (first process after a build) |
+//! | --- | --- | --- |
+//! | `RasterRenderer::new()` | 14 ms | ~185 ms |
+//! | **first render** | **~85 ms** | **~1.35 s** |
+//! | later renders, 3-point plot at 1200×800 | 5 ms | 5 ms |
+//! | later renders, 50k points | ~200 ms | ~200 ms |
+//!
+//! **Constructing the renderer is not the expensive part — the first render
+//! is**, and most of that is text: parley/fontique enumerating and loading
+//! system faces. Rendering an SVG first (which needs no GPU but does the same
+//! text work) drops the first raster render from ~85 ms to ~20 ms, which is
+//! what identifies the cost. It is per *process*, not per renderer.
+//!
+//! So this thread does two things at startup: builds the renderer, and renders
+//! a throwaway frame to pay that cost before any user is waiting on it. With
+//! the warm-up, the first plot of a session renders in ~14 ms instead of
+//! ~85 ms — and in the genuinely cold case, instead of well over a second.
+//!
+//! The renderer is `Send` but not `Sync`, which is exactly the shape this
+//! wants: it moves here once and is never shared.
+
+use std::sync::mpsc::{self, Receiver, Sender};
+
+use anyhow::{anyhow, Result};
+use ggsql::reader::Spec;
+
+use super::{Format, RenderRequest};
+
+/// How long to wait for a GPU adapter before deciding there isn't one.
+///
+/// The probe is worth doing eagerly — a lazy one would leave the *first* plot
+/// unable to choose a path — but not worth hanging on. A driver that has not
+/// answered in ten seconds is not one to render through.
+const PROBE_TIMEOUT: std::time::Duration = std::time::Duration::from_secs(10);
+
+/// Work for the render thread.
+enum Job {
+ /// Render `spec` and send the bytes back down `reply`.
+ Render {
+ spec: Box