From ebc3117c114a0268051cbb9a41c1d8fa4c99f64a Mon Sep 17 00:00:00 2001
From: Vadim1987 <Vadim.stetskiy@gmail.com>
Date: Thu, 2 Jul 2026 13:42:38 +0200
Subject: [PATCH] perf(input): cut per-character render cost (D2)

---
 src/util/view.lua                |  4 +--
 src/view/input/userInputView.lua |  7 -----
 tests/util/view_spec.lua         | 45 ++++++++++++++++++++++++++++++++
 3 files changed, 47 insertions(+), 9 deletions(-)
 create mode 100644 tests/util/view_spec.lua

diff --git a/src/util/view.lua b/src/util/view.lua
index cd4fb48f..01d1f1c6 100644
--- a/src/util/view.lua
+++ b/src/util/view.lua
@@ -36,7 +36,7 @@ end
 --- @param selected boolean
 local write_token = function(dy, dx, token,
                              color, bgcolor, selected)
-  gfx.push('all')
+  local r, g, b, a = gfx.getColor()
   if selected then
     gfx.setColor(color)
     local back = string.rep('█', string.ulen(token))
@@ -46,7 +46,7 @@ local write_token = function(dy, dx, token,
     gfx.setColor(color)
   end
   gfx.print(token, dx, dy)
-  gfx.pop()
+  gfx.setColor(r, g, b, a)
 end
 
 --- Hide elements for debugging
diff --git a/src/view/input/userInputView.lua b/src/view/input/userInputView.lua
index 73cbbd83..c9c59626 100644
--- a/src/view/input/userInputView.lua
+++ b/src/view/input/userInputView.lua
@@ -103,7 +103,6 @@ function UserInputView:render_input(input, status, time)
   local apparentHeight = inHeight
 
   local wrap_forward = vc.wrap_forward
-  local wrap_reverse = vc.wrap_reverse
 
 
   local vpH = gfx.getHeight()
@@ -166,7 +165,6 @@ function UserInputView:render_input(input, status, time)
         local char = string.usub(s, c, c)
         local color = colors.fg
 
-        local hl_li = wrap_reverse[ln]
         local tlc = vc:translate_from_visible(Cursor(l, c))
 
         if tlc then
@@ -204,11 +202,6 @@ function UserInputView:render_input(input, status, time)
             end
           end
         end)()
-        local of = calc_overflow(w, text, cursorInfo.cursor)
-        --- push any further lines down to display phantom line
-        if ofpos and hl_li > cl then
-          of = of - 1
-        end
         local dy = (l) * fh
         local dx = (c - 1) * fw
         ViewUtils.write_token(dy, dx,
diff --git a/tests/util/view_spec.lua b/tests/util/view_spec.lua
new file mode 100644
index 00000000..af69373a
--- /dev/null
+++ b/tests/util/view_spec.lua
@@ -0,0 +1,45 @@
+local mock = require("tests.mock")
+mock.mock_love({})
+require("util.view")
+
+describe('view utils #view', function()
+  local prev_gfx
+  local color
+
+  setup(function()
+    prev_gfx = _G.gfx
+    color = { 1, 1, 1, 1 }
+    _G.gfx = {
+      getColor = function()
+        return color[1], color[2], color[3], color[4]
+      end,
+      setColor = function(r, g, b, a)
+        if type(r) == 'table' then
+          color = { r[1], r[2], r[3], r[4] }
+        else
+          color = { r, g, b, a }
+        end
+      end,
+      print = function() end,
+    }
+  end)
+
+  teardown(function()
+    _G.gfx = prev_gfx
+  end)
+
+  describe('write_token', function()
+    it('leaves the active color untouched', function()
+      gfx.setColor(0.1, 0.2, 0.3, 1)
+      ViewUtils.write_token(0, 0, 'x',
+        { 1, 0, 0, 1 }, { 0, 0, 0, 1 }, false)
+      local r, g, b = gfx.getColor()
+      assert.same({ 0.1, 0.2, 0.3 }, { r, g, b })
+
+      ViewUtils.write_token(0, 0, 'x',
+        { 1, 0, 0, 1 }, { 0, 0, 0, 1 }, true)
+      r, g, b = gfx.getColor()
+      assert.same({ 0.1, 0.2, 0.3 }, { r, g, b })
+    end)
+  end)
+end)