Paint a layout as vectors: paint.PaintVector, PageLayout, pdfcanvas

README.md

@@ -58,7 +58,37 @@ For more control use an `*engine.Engine` (from `engine.New()`): it adds
 and a `DisableJS` field to render the static, no-JavaScript document.
 
 The viewport width is fixed; the height grows to fit the whole page (at least the
-viewport height). There is also a CLI:
+viewport height).
+
+### Vector output (PDF)
+
+`LayoutHTML` / `LayoutDocument` run the same pipeline without painting and
+return a `*PageLayout`. `Paint()` gives the image `RenderHTML` would;
+`PaintVector(c)` draws the same boxes through a `paint.Canvas` instead — paths,
+shadings, images placed in their boxes and positioned glyphs of the very faces
+the layout measured with. The `pdfcanvas` package is that canvas for a
+[go-pdfkit](https://github.com/go-pdfkit/pdfkit) page: text stays text
+(subset-embedded Type0 fonts with a `/ToUnicode` map — selectable,
+searchable), edges stay sharp at any zoom, and an image used on many pages is
+embedded once.
+
+```go
+l, _ := eng.LayoutHTML(ctx, html, baseURL, image.Rect(0, 0, 1280, 720))
+doc := pdfkit.New(pdfkit.Options{Compress: true})
+page := doc.AddPage(pdfkit.NewPageSize(960, 540)) // a CSS px is 3/4 pt
+stats := l.PaintVector(pdfcanvas.New(page, 0.75, pdfcanvas.NewFonts()))
+```
+
+What has no vector form here — a subtree under `opacity` < 1, a `filter`,
+`mask-image` or `transform: rotate()`, a blurred `box-shadow`, a gradient
+whose opacity fades between two stops, a form control — is painted by the
+raster painter as a bitmap of **that element only**, placed where it was, with
+its text laid over it invisibly (text rendering mode 3) so that it can still
+be selected; `stats.Rasterized` counts them. Laying out and painting are split
+so that pages can be laid out concurrently and painted, in order, into one
+document.
+
+There is also a CLI:
 
 ```
 go run ./cmd/render -url https://example.com/ -out out.png -w 1024 -h 768
@@ -83,8 +113,9 @@ Fetch (go-browserhttp)  →  Parse (x/net/html → dom)  →  Cascade (css: +var
 | `css` | Real CSS subset: value model, stylesheet/declaration parser, tag/class/id + descendant/child/sibling combinators + `:checked`/`:not()` selectors with specificity, `var()` custom properties, `@media` width queries, modern colour (`rgb()/hsl()`), dark-mode, UA stylesheet, cascade + inheritance. |
 | `layout` | Full box model — block-and-inline flow, floats + clear, flexbox, CSS grid, tables, `position` (relative/absolute/fixed/sticky), margin collapsing, greedy word-wrap — driven by a `Measurer` interface (font-free, exactly testable). |
 | `js` | JavaScript execution via [goja](https://github.com/dop251/goja) bound to a minimal real DOM, with `fetch()`/XHR and laid-out-geometry read-back (`getBoundingClientRect`, `offset*`, `getComputedStyle`). |
-| `paint` | Rasterises the box tree to `*image.RGBA` — AA text (real bold + italic), gradients, border-radius, box-shadow, opacity, images and SVG; also the real `Measurer` (go-opentype faces). |
-| `engine` (root) | `Fetch`, `Render`, `Screenshot`, `RenderHTML`, `RenderWithLinks`, the settle-then-render loop, image + SVG loading, and the anchor hit-map. |
+| `paint` | Rasterises the box tree to `*image.RGBA` — AA text (real bold + italic), gradients, border-radius, box-shadow, opacity, images and SVG; also the real `Measurer` (go-opentype faces). `PaintVector` draws the same tree through a vector `Canvas`. |
+| `pdfcanvas` | A `paint.Canvas` drawing into a go-pdfkit page: vector PDF with real text. |
+| `engine` (root) | `Fetch`, `Render`, `Screenshot`, `RenderHTML`, `RenderWithLinks`, `LayoutHTML` → `PageLayout` (paint as image or vectors), the settle-then-render loop, image + SVG loading, and the anchor hit-map. |
 | `cmd/render` | CLI: `render -url URL -out shot.png -w 1024 -h 768` (or `-file page.html`). |
 
 Everything reused is pure-Go and BSD/MIT — see [`SURVEY.md`](SURVEY.md) for the

css/gradient_geometry_test.go

@@ -0,0 +1,40 @@
+// Copyright (c) the go-webengine/engine authors.
+// SPDX-License-Identifier: BSD-3-Clause
+
+package css
+
+import (
+	"math"
+	"testing"
+)
+
+// TestGradientGeometryAgreesWithAt: the shape Geometry reports is the one At
+// samples — the colour At gives at a point is the stop colour at that point's
+// position along the reported axis (linear) or ellipse (radial).
+func TestGradientGeometryAgreesWithAt(t *testing.T) {
+	black, white := Color{A: 255}, Color{R: 255, G: 255, B: 255, A: 255}
+	stops := []ColorStop{{Color: black}, {Color: white}}
+
+	lin := (&Gradient{AngleDeg: 90, Stops: stops}).Sampler(200, 50)
+	g := lin.Geometry()
+	near := func(a, b float64) bool { return math.Abs(a-b) < 1e-9 }
+	if g.Radial || !near(g.X0, 0) || !near(g.X1, 200) || !near(g.Y0, 25) || !near(g.Y1, 25) {
+		t.Errorf("linear 90deg on 200×50: axis (%v,%v)→(%v,%v), want (0,25)→(200,25)", g.X0, g.Y0, g.X1, g.Y1)
+	}
+	if len(g.Stops) != 2 || g.Stops[0].Pos != 0 || g.Stops[1].Pos != 1 || g.Stops[1].Color != white {
+		t.Errorf("stops = %+v", g.Stops)
+	}
+	if c := lin.At(150, 10); math.Abs(float64(c.R)-0.75*255) > 1 {
+		t.Errorf("At(150) = %v, want 75 %% along the axis", c)
+	}
+
+	rad := (&Gradient{Radial: true, Shape: RadialCircle, Extent: ExtentClosestSide,
+		PosX: Length{Percent: .5, IsPercent: true}, PosY: Length{Percent: .5, IsPercent: true}, Stops: stops}).Sampler(100, 60)
+	g = rad.Geometry()
+	if !g.Radial || g.CX != 50 || g.CY != 30 || g.RX != 30 || g.RY != 30 {
+		t.Errorf("closest-side circle on 100×60: centre (%v,%v) radii (%v,%v), want (50,30) and 30", g.CX, g.CY, g.RX, g.RY)
+	}
+	if c := rad.At(50+15, 30); math.Abs(float64(c.R)-0.5*255) > 1 {
+		t.Errorf("At half the radius = %v, want the middle colour", c)
+	}
+}

css/gradient_sample.go

@@ -144,6 +144,45 @@ func scaleToCorner(sx, sy, dx, dy float64) (float64, float64) {
 	return sx * k, sy * k
 }
 
+// GradientStop is one colour stop of a sampler, resolved: Pos is its
+// fraction along the gradient line (linear) or ray (radial), non-decreasing
+// from one stop to the next; two stops may share a position (a hard edge).
+type GradientStop struct {
+	Pos   float64
+	Color Color
+}
+
+// GradientGeometry is a sampler's resolved shape, in the box-local pixel
+// space At is queried in: what a vector backend needs to emit the same
+// gradient as a shading instead of sampling it pixel by pixel.
+//
+// For a linear gradient (Radial false) the colour at fraction t of the stops
+// lies on the line through (X0,Y0) + t·((X1,Y1)−(X0,Y0)) perpendicular to
+// that axis, clamped to the end colours beyond it. For a radial one it lies
+// on the ellipse centred on (CX,CY) with radii t·RX and t·RY, clamped beyond
+// t = 1.
+type GradientGeometry struct {
+	Radial         bool
+	X0, Y0, X1, Y1 float64
+	CX, CY, RX, RY float64
+	Stops          []GradientStop
+}
+
+// Geometry returns the sampler's resolved shape and stops.
+func (s GradientSampler) Geometry() GradientGeometry {
+	g := GradientGeometry{Radial: s.radial, Stops: make([]GradientStop, len(s.stops))}
+	for i, st := range s.stops {
+		g.Stops[i] = GradientStop{Pos: st.pos, Color: st.color}
+	}
+	if s.radial {
+		g.CX, g.CY, g.RX, g.RY = s.cx, s.cy, s.rx, s.ry
+	} else {
+		g.X0, g.Y0 = s.sx, s.sy
+		g.X1, g.Y1 = s.sx+s.dx*s.length, s.sy+s.dy*s.length
+	}
+	return g
+}
+
 // At returns the gradient colour at box-local point (px, py).
 func (s GradientSampler) At(px, py float64) Color {
 	var t float64

go.mod

@@ -6,28 +6,39 @@ require (
 	github.com/dop251/goja v0.0.0-20260926152631-39ec2650adc9
 	github.com/evanw/esbuild v0.28.2
 	github.com/go-browserhttp/browserhttp v0.2.0
-	github.com/go-gfx/gfx v0.34.0
-	github.com/go-images/images v0.0.0-20260927173152-87444e36aac4
-	github.com/go-opentype/fonts v0.10.0
-	github.com/go-opentype/opentype v0.13.1-0.20260927180318-ae6327b14eac
+	github.com/go-gfx/gfx v0.35.0
+	github.com/go-images/images v0.1.0
+	github.com/go-opentype/fonts v0.12.0
+	github.com/go-opentype/opentype v0.15.0
+	github.com/go-pdfkit/pdfkit v0.15.0
 	github.com/go-webengine/esbuildsandbox v0.1.0
-	github.com/go-widgets/painter v0.13.0
+	github.com/go-widgets/painter v0.16.0
 	github.com/srwiley/oksvg v0.0.0-20221011165216-be6e8873101c
 	github.com/srwiley/rasterx v0.0.0-20220730225603-2ab79fcdd4ef
 	golang.org/x/image v0.46.0
 	golang.org/x/net v0.61.0
+	rsc.io/pdf v0.1.1
 )
 
 require (
-	github.com/ajroetker/go-highway v0.0.4 // indirect
-	github.com/andybalholm/brotli v1.2.5 // indirect
+	github.com/ajroetker/go-highway v0.0.12 // indirect
+	github.com/andybalholm/brotli v1.2.6 // indirect
 	github.com/breml/rootcerts v0.3.7 // indirect
+	github.com/coder/websocket v1.8.15 // indirect
 	github.com/dlclark/regexp2/v2 v2.5.2 // indirect
-	github.com/go-images/gif v0.1.0 // indirect
-	github.com/go-images/jpeg v0.2.0 // indirect
-	github.com/go-images/jpeg2000 v0.1.0 // indirect
-	github.com/go-images/png v0.1.0 // indirect
+	github.com/go-crdt/collab v0.77.1 // indirect
+	github.com/go-crdt/crdt v0.57.0 // indirect
+	github.com/go-icons/iconoir v0.3.0 // indirect
+	github.com/go-images/gif v0.2.0 // indirect
+	github.com/go-images/jpeg v0.3.0 // indirect
+	github.com/go-images/jpeg2000 v0.13.3 // indirect
+	github.com/go-images/png v0.2.0 // indirect
+	github.com/go-opentype/shape v0.7.0 // indirect
+	github.com/go-richdoc/richdoc v0.6.0 // indirect
 	github.com/go-sourcemap/sourcemap v2.1.4+incompatible // indirect
+	github.com/go-typeset/bidi v0.3.1 // indirect
+	github.com/go-widgets/mvvm v0.14.0 // indirect
+	github.com/go-widgets/toolkit v0.329.0 // indirect
 	github.com/google/pprof v0.0.0-20240727154555-813a5fbdbec8 // indirect
 	github.com/klauspost/compress v1.18.7 // indirect
 	github.com/refraction-networking/utls v1.8.2 // indirect
@@ -37,4 +48,7 @@ require (
 	golang.org/x/crypto v0.58.0 // indirect
 	golang.org/x/sys v0.49.0 // indirect
 	golang.org/x/text v0.43.0 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20260706201446-f0a921348800 // indirect
+	google.golang.org/grpc v1.84.0 // indirect
+	google.golang.org/protobuf v1.36.12 // indirect
 )

go.sum

@@ -1,11 +1,13 @@
 github.com/Masterminds/semver/v3 v3.5.0 h1:kQceYJfbupGfZOKZQg0kou0DgAKhzDg2NZPAwZ/2OOE=
 github.com/Masterminds/semver/v3 v3.5.0/go.mod h1:4V+yj/TJE1HU9XfppCwVMZq3I84lprf4nC11bSS5beM=
-github.com/ajroetker/go-highway v0.0.4 h1:RDQo+9OhTXI6BFctLo+5gYpHNbb92VYJ0ObnR4l6xAQ=
-github.com/ajroetker/go-highway v0.0.4/go.mod h1:C/zYPNSSpOaraejY89FUTZTyQNEhi5+rEbU0LjlqJeU=
-github.com/andybalholm/brotli v1.2.5 h1:BSI8V4zmx/3BAn6OKjF1PmfVq7Aoi52AdFsi6bpCx+s=
-github.com/andybalholm/brotli v1.2.5/go.mod h1:rzTDkvFWvIrjDXZHkuS16NPggd91W3kUSvPlQ1pLaKY=
+github.com/ajroetker/go-highway v0.0.12 h1:OcGp/l/W7WQtH5ELLuNnKXCuR7ePpWGh2RWZI/INtck=
+github.com/ajroetker/go-highway v0.0.12/go.mod h1:un7fcrwix7UOHJrr18Lgh5eeF+1yaZiGWdTw3FbfDv4=
+github.com/andybalholm/brotli v1.2.6 h1:ftYnfj6usCp+UGV5kSJ3+chpMQgU+gJf/AxsUQ52REI=
+github.com/andybalholm/brotli v1.2.6/go.mod h1:rzTDkvFWvIrjDXZHkuS16NPggd91W3kUSvPlQ1pLaKY=
 github.com/breml/rootcerts v0.3.7 h1:KZZkmd591bmq//te85L0u33zgtI3phyGlfD8u7/pzUg=
 github.com/breml/rootcerts v0.3.7/go.mod h1:S/PKh+4d1HUn4HQovEB8hPJZO6pUZYrIhmXBhsegfXw=
+github.com/coder/websocket v1.8.15 h1:6B2JPeOGlpff2Uz6vOEH1Vzpi0iUz20A+lPVhPHtNUA=
+github.com/coder/websocket v1.8.15/go.mod h1:NX3SzP+inril6yawo5CQXx8+fk145lPDC6pumgx0mVg=
 github.com/dlclark/regexp2/v2 v2.5.2 h1:HAsucWRhsqcDzl6Ua9aR8JwYOTzrZyPrF0/FNxJVAI0=
 github.com/dlclark/regexp2/v2 v2.5.2/go.mod h1:avUrQvPaLz2DrFNHJF0taWAFFX2C1GMSSoeiqFjcBmU=
 github.com/dop251/goja v0.0.0-20260926152631-39ec2650adc9 h1:Ksd3Vil12b/ykT5NjGzd3qNc688cJB9OUXJZZChEktI=
@@ -14,32 +16,56 @@ github.com/evanw/esbuild v0.28.2 h1:A2uETn4jrQTcXaT/shwTDTYBxDjl7fV7nXmUrJxfA2w=
 github.com/evanw/esbuild v0.28.2/go.mod h1:D2vIQZqV/vIf/VRHtViaUtViZmG7o+kKmlBfVQuRi48=
 github.com/go-browserhttp/browserhttp v0.2.0 h1:3RcjOQVHgqhSOmI5cfsURpexw/vetoDUoLXKzgTCSac=
 github.com/go-browserhttp/browserhttp v0.2.0/go.mod h1:VJiwBxLetXdc8eDadOcNbiO0EelNQPny0cLZhg1hTKU=
-github.com/go-gfx/gfx v0.34.0 h1:K46srusNnZls/xkmJRvxpBajlptgrXc6d3exa4ZxhoA=
-github.com/go-gfx/gfx v0.34.0/go.mod h1:TC2X+3GMXm8mYZPmp/v7bFrRa69p+k0xz0Nabbd9sII=
-github.com/go-images/gif v0.1.0 h1:g2ZnRd41PutXIt1mCZSZsRpqqUiD0m+UbAjZ5ylC0RU=
-github.com/go-images/gif v0.1.0/go.mod h1:8mk9sA/K3U61jL+rj4U+Yv3TRKeoGp2fMxF25ykOOwY=
-github.com/go-images/images v0.0.0-20260927173152-87444e36aac4 h1:Likv0wVxr9vDo2ITd4A7SOMKCrN3efOHs9CsANj2y+0=
-github.com/go-images/images v0.0.0-20260927173152-87444e36aac4/go.mod h1:bc99LrkZxVUjP+Di3JCmf4SoHzim/PNcHEJfKd1yUtg=
-github.com/go-images/jpeg v0.2.0 h1:dn55cTczPdOJf+NQq+sETCFeov/KeP1haF1ES+FJa+4=
-github.com/go-images/jpeg v0.2.0/go.mod h1:2C1DevAM+HaQlysTLbSdyol8X/RlvmsXmHAXs9teAqo=
-github.com/go-images/jpeg2000 v0.1.0 h1:SiFAZ6NGvGLU+VmxKji74RiSQDeK6TyjUZr1wjlxRzY=
-github.com/go-images/jpeg2000 v0.1.0/go.mod h1:MwSmrbiP6RK7eLphoNyzY60BAXWOD+8LVdBYDPIBrN4=
-github.com/go-images/png v0.1.0 h1:OI4yHotS0lA75sLnG2FTL2Vooh4PWpVWEidre1msSe0=
-github.com/go-images/png v0.1.0/go.mod h1:V9vaEbr2nrZGorUWn4xv9F24Yuu1/qLVtmailM9GBVo=
-github.com/go-opentype/fonts v0.10.0 h1:9f7ik795SlBEJjz6iqBE/ZV2PaTauAj537MMWw9t4OQ=
-github.com/go-opentype/fonts v0.10.0/go.mod h1:b+o8v1zDZ6B3GixA398jGILAh09+WwfyoYz52zKe7DA=
-github.com/go-opentype/opentype v0.13.1-0.20260927180318-ae6327b14eac h1:mpzfJQe1RlF2zawKqvL5poyNdaV6pMbHkK1h+GVLMuM=
-github.com/go-opentype/opentype v0.13.1-0.20260927180318-ae6327b14eac/go.mod h1:UjZOTCMtkHheDPzfP0ZghDoQ7wIr6L72T/kuC9Ph1hw=
+github.com/go-crdt/collab v0.77.1 h1:eKzzFLIt4eQpM/YLRbbViMbSdHcN6ivSHeA5aldqgzw=
+github.com/go-crdt/collab v0.77.1/go.mod h1:LFqHBOnnr2kRFrTxCVJYWGlaF8jc7l51Z7yVrUY2RnA=
+github.com/go-crdt/crdt v0.57.0 h1:sNLDTVCEnSb20gm77BUuYav8dzj5krmly/z9O7eRMCo=
+github.com/go-crdt/crdt v0.57.0/go.mod h1:zdVTTDLGV5JYAoTJDqCivcAT+/B5gGebDsVd8QNZpVs=
+github.com/go-gfx/gfx v0.35.0 h1:AaXMxDMxNB1hROxzx+3EoO06KxsrQUvnw/10olmSgVo=
+github.com/go-gfx/gfx v0.35.0/go.mod h1:qIZS9u2+VnBk5CX7o4f/fQ5uD8c+mPFTtAPE85s8V90=
+github.com/go-icons/iconoir v0.3.0 h1:kHG2sU5IsCvtBS1JICuXgfFo5f8UfwY1m7KYMVy97CI=
+github.com/go-icons/iconoir v0.3.0/go.mod h1:lPh5OuzVQ+rR4qDPGgAdSRUhnCbHeCAX70HDdwp8/RI=
+github.com/go-images/gif v0.2.0 h1:8Xl4Nan+PvyqH4wPre7wJUH61T2eJKOKonFKOdMdpkU=
+github.com/go-images/gif v0.2.0/go.mod h1:rjpP1X62GLs6pmdMxuvwBjpV4LYE4Ue6rPbeqANWHrQ=
+github.com/go-images/images v0.1.0 h1:KbbxTUpCbddpf6UsMFQetm75xsRXREyUjX0CIvd8YvE=
+github.com/go-images/images v0.1.0/go.mod h1:+8V6BRjITiKEZyyvZZm//bQ8Pdr5rgHgLEElkVOMm40=
+github.com/go-images/jpeg v0.3.0 h1:i6CGNbN2YNEz8stBI0hXjN6UwVGwQ9zCh8LvFeD8fHg=
+github.com/go-images/jpeg v0.3.0/go.mod h1:3eUjtNscxUULLUH88DvMN8OKTq2C0/0AjubOjAHoHHk=
+github.com/go-images/jpeg2000 v0.13.3 h1:GSnkQWQ72ANwfi/xYWt3za9Nfss+C1iBbk4uubLWYHw=
+github.com/go-images/jpeg2000 v0.13.3/go.mod h1:r07D0wUJxBPZcsLTkLFt3OkL3DubrH6DsmRjJRnZYlo=
+github.com/go-images/png v0.2.0 h1:RFPkHPuRYRvrDJol/Mmn9P1DSaLV8VPmEQ8BkZoCpL0=
+github.com/go-images/png v0.2.0/go.mod h1:g1qayDmWLClHo9R5KQ+RrcUNTBcaA4c1thaIfEoS3vg=
+github.com/go-opentype/fonts v0.12.0 h1:gjYYkbDZBK3JHpraakgGNnXdkGq8oADerhDYjC22ILQ=
+github.com/go-opentype/fonts v0.12.0/go.mod h1:Kiep7ojxxaR2ALFeB/akcFHQyl1gG5OLIobp8EzaZSA=
+github.com/go-opentype/opentype v0.15.0 h1:ioE3eCbNZavlk/w073J3uX5FKjqhgOHQw+wZZdJ+gE4=
+github.com/go-opentype/opentype v0.15.0/go.mod h1:ZB31jTJl2mhPESXYMuUW+p36UrOabw/2+6mtyh/vNnI=
+github.com/go-opentype/shape v0.7.0 h1:hXUkI4xdpkzq31ZYf/6zfkDAgRLZnTjI1q8DWLu5MGQ=
+github.com/go-opentype/shape v0.7.0/go.mod h1:n8pMQ/MH4Oscxwd9J0B7RiZ5gKlD0yagRQKYsAmJ9Rw=
+github.com/go-pdfkit/pdfkit v0.15.0 h1:xfG96T7VYUgGMLNTZG1w0ISwLTGdgY1oWF0VDG5A0kE=
+github.com/go-pdfkit/pdfkit v0.15.0/go.mod h1:FrCLKGwHSPlEvsT/Ud7mO81wK1rvKZFxeH2ioesa1/4=
+github.com/go-richdoc/richdoc v0.6.0 h1:cema3hE5AAektDXTmvhWyBVnkCcZTVKhnkingwqsN7k=
+github.com/go-richdoc/richdoc v0.6.0/go.mod h1:RhxAcqwoUg1pnTYCiRdKILzOZwOmraO0dMJI4N6yY70=
 github.com/go-sourcemap/sourcemap v2.1.4+incompatible h1:a+iTbH5auLKxaNwQFg0B+TCYl6lbukKPc7b5x0n1s6Q=
 github.com/go-sourcemap/sourcemap v2.1.4+incompatible/go.mod h1:F8jJfvm2KbVjc5NqelyYJmf/v5J0dwNLS2mL4sNA1Jg=
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