Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: 645ce1764ad44d709b8ddfdcfd564fd06d1d8dc6
https://github.com/WebKit/WebKit/commit/645ce1764ad44d709b8ddfdcfd564fd06d1d8dc6
Author: Nic <[email protected]>
Date: 2026-07-21 (Tue, 21 Jul 2026)
Changed paths:
M Source/WebCore/platform/graphics/skia/ShareableBitmapSkia.cpp
Log Message:
-----------
[GTK][Skia] ShareableBitmap::paint ignores CompositeOperator::Copy
https://bugs.webkit.org/show_bug.cgi?id=319864
Reviewed by Carlos Garcia Campos.
BackingStore::incorporateUpdate sets CompositeOperator::Copy on the
GraphicsContext before painting update rects into the persistent backing
store, so that transparent webviews overwrite the previous frame instead of
blending over it. The Skia ShareableBitmap::paint implementation calls the
raw SkCanvas with a null SkPaint, which defaults to SrcOver and silently
discards the requested operator.
On a transparent webview every partial update therefore blends over the
previous frame's pixels: opaque content that shrinks or moves leaves
permanent trails, and semi-transparent content accumulates opacity on every
repaint, until the backing store is reallocated. Map CompositeOperator::Copy
to SkBlendMode::kSrc; all other callers keep the default SrcOver.
* Source/WebCore/platform/graphics/skia/ShareableBitmapSkia.cpp:
(WebCore::ShareableBitmap::paint): Honor CompositeOperator::Copy.
Canonical link: https://commits.webkit.org/317608@main
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