Branch: refs/heads/main
Home: https://github.com/WebKit/WebKit
Commit: 77e5bb39107371558f6ee94cf74b988d3231ab41
https://github.com/WebKit/WebKit/commit/77e5bb39107371558f6ee94cf74b988d3231ab41
Author: Matt Woodrow <[email protected]>
Date: 2024-01-31 (Wed, 31 Jan 2024)
Changed paths:
A
LayoutTests/compositing/repaint/needs-no-display-volatile-repaint-expected.html
A LayoutTests/compositing/repaint/needs-no-display-volatile-repaint.html
M Source/WebKit/GPUProcess/graphics/RemoteRenderingBackend.cpp
Log Message:
-----------
Corrupt tiles when scrolling and selecting text quickly.
https://bugs.webkit.org/show_bug.cgi?id=268430
<rdar://121934201>
Reviewed by Simon Fraser.
If ensureBufferForDisplay returns
SwapBuffersDisplayRequirement::NeedsNoDisplay, then we don't want
to call prepareForDisplay. The latter copies pixels from the old front buffer
into the new one,
and when no display is required there wasn't a front/back swap, so no copy
needed.
This caused issues because we also set 'm_previouslyPaintedRect` to the
(empty!) dirty area,
effectively recording that the front and back buffers were identical, despite
it likely
not being true. The next attempt to paint these buffers would omit a
back-to-front copy,
thinking the buffers were identical, and then we'd do a partial update on top
of stale content.
This happens when scrolling, since scrolling tiles get pooled (and made
volatile), then
recycled.
*
LayoutTests/compositing/repaint/needs-no-display-volatile-repaint-expected.html:
Added.
* LayoutTests/compositing/repaint/needs-no-display-volatile-repaint.html: Added.
* Source/WebKit/GPUProcess/graphics/RemoteRenderingBackend.cpp:
(WebKit::RemoteRenderingBackend::prepareImageBufferSetsForDisplay):
(WebKit::RemoteRenderingBackend::prepareImageBufferSetsForDisplaySync):
Canonical link: https://commits.webkit.org/273838@main
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