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LibWeb: Save ScrollState snapshot in DisplayList to avoid race condition
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Browse source 
With this change we save a copy of of scroll state at the time of
recording a display list, instead of actual ScrollState pointer that
could be modifed by the main thread while display list is beings
rasterized on the rendering thread, which leads to a frame painted with
inconsistent scroll state.

Fixes https://github.com/LadybirdBrowser/ladybird/issues/4288
This commit is contained in:
Aliaksandr Kalenik 2025-04-11 20:00:56 +02:00 • committed by Alexander Kalenik
commit 6507d23e29
Notes: github-actions[bot] 2025-04-12 00:56:11 +00:00
18 changed files with 85 additions and 29 deletions
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3
Libraries/LibWeb/Painting/SVGMaskable.cpp
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@ -100,7 +100,8 @@ RefPtr<Gfx::ImmutableBitmap> SVGMaskable::calculate_mask_of_svg(PaintContext& co
StackingContext::paint_svg(paint_context, paintable, PaintPhase::Foreground);
auto painting_surface = Gfx::PaintingSurface::wrap_bitmap(*mask_bitmap);
DisplayListPlayerSkia display_list_player;
display_list_player.execute(display_list, painting_surface);
ScrollStateSnapshot scroll_state_snapshot;
display_list_player.execute(display_list, scroll_state_snapshot, painting_surface);
return mask_bitmap;
};
RefPtr<Gfx::Bitmap> mask_bitmap = {};