[webkit-changes] [WebKit/WebKit] 8ed3d5: Use device pixel scaled backing store for <canvas>...

[mattwoodrow]

  Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: 8ed3d524525aa6fa2ee34d47e744f36947536bfb
      https://github.com/WebKit/WebKit/commit/8ed3d524525aa6fa2ee34d47e744f36947536bfb
  Author: Matt Woodrow <mattwoodrow at apple.com>
  Date:   2022-11-03 (Thu, 03 Nov 2022)

  Changed paths:
    M LayoutTests/platform/ios-wk2/TestExpectations
    M Source/WebCore/rendering/RenderLayerBacking.cpp
    M Source/WebCore/rendering/RenderLayerCompositor.cpp

  Log Message:
  -----------
  Use device pixel scaled backing store for <canvas> with image-rendering: pixelated.
https://bugs.webkit.org/show_bug.cgi?id=247251
<rdar://99895407>

Reviewed by Simon Fraser.

We need to do scaling during painting to apply the image-rendering effect. An alternative fix would
be to set the image-rendering value on the GraphicsLayer, but its complicated to make that change
dependent on having computed isUnscaledBitmapOnly.

* LayoutTests/platform/ios-wk2/TestExpectations:
* Source/WebCore/rendering/RenderLayerBacking.cpp:
(WebCore::RenderLayerBacking::isUnscaledBitmapOnly const):
* Source/WebCore/rendering/RenderLayerCompositor.cpp:
(WebCore::RenderLayerCompositor::layerStyleChanged):

Canonical link: https://commits.webkit.org/256299@main