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Merge pull request #21277 from calixteman/issue21276

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Clear the full SMask scratch canvas in compose()
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Tim van der Meij 2026-05-15 20:04:11 +02:00 committed by GitHub
commit 26474b09cb
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1 changed files with 5 additions and 9 deletions
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14
src/display/canvas.js
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@ -1850,17 +1850,13 @@ class CanvasGraphics {
return;
}
// Whatever was drawn has been moved to the suspended canvas, now clear it
// out of the current canvas. Only the dirty box region needs clearing;
// everything outside it is already transparent.
// Clear the full scratch canvas, not just the dirty box. Pixels left
// outside dirtyBox can leak into a later compose() whose destination-in
// pass doesn't overwrite them, producing stale output -- this is what
// breaks `firefox-issue17779-partial` (issue #21276).
this.ctx.save();
this.ctx.setTransform(1, 0, 0, 1, 0, 0);
this.ctx.clearRect(
dirtyBox[0],
dirtyBox[1],
dirtyBox[2] - dirtyBox[0],
dirtyBox[3] - dirtyBox[1]
);
this.ctx.clearRect(0, 0, this.ctx.canvas.width, this.ctx.canvas.height);
this.ctx.restore();
}