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Code Issues Projects Releases Packages Wiki Activity Actions 10

LibWeb/CSS: Improved implementation of background-blend-mode

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This is a improved version of a73cd88f0c
The old commit was reverted in 552dd18696

The new version only paints an element into a new layer if background
blend modes other than normal are used. The rasterization performance
of most websites should therefore not suffer.

Co-Authored-By: Alexander Kalenik <kalenik.aliaksandr@gmail.com>
This commit is contained in:
Glenn Skrzypczak 2025-03-29 23:44:25 +01:00 • committed by Alexander Kalenik
commit 9973b01848
Notes: github-actions[bot] 2025-04-01 11:39:02 +00:00
16 changed files with 311 additions and 198 deletions
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12
Libraries/LibWeb/Painting/StackingContext.cpp
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@ -14,6 +14,7 @@
#include <LibWeb/Layout/Box.h>
#include <LibWeb/Layout/ReplacedBox.h>
#include <LibWeb/Layout/Viewport.h>
#include <LibWeb/Painting/Blending.h>
#include <LibWeb/Painting/DisplayListRecorder.h>
#include <LibWeb/Painting/PaintableBox.h>
#include <LibWeb/Painting/SVGSVGPaintable.h>
@ -313,16 +314,7 @@ void StackingContext::paint(PaintContext& context) const
auto transform_matrix = paintable_box().transform();
auto transform_origin = paintable_box().transform_origin().to_type<float>();
Gfx::CompositingAndBlendingOperator compositing_and_blending_operator;
switch (paintable_box().computed_values().mix_blend_mode()) {
#undef __ENUMERATE
#define __ENUMERATE(mix_blend_mode) \
case CSS::MixBlendMode::mix_blend_mode: \
compositing_and_blending_operator = Gfx::CompositingAndBlendingOperator::mix_blend_mode; \
break;
ENUMERATE_MIX_BLEND_MODES(__ENUMERATE)
#undef __ENUMERATE
}
Gfx::CompositingAndBlendingOperator compositing_and_blending_operator = mix_blend_mode_to_compositing_and_blending_operator(paintable_box().computed_values().mix_blend_mode());
DisplayListRecorder::PushStackingContextParams push_stacking_context_params {
.opacity = opacity,