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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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3
Libraries/LibWeb/Layout/Node.cpp
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@ -397,6 +397,7 @@ void NodeWithStyle::apply_style(CSS::ComputedProperties const& computed_style)
auto const& y_positions = computed_style.property(CSS::PropertyID::BackgroundPositionY);
auto const& repeats = computed_style.property(CSS::PropertyID::BackgroundRepeat);
auto const& sizes = computed_style.property(CSS::PropertyID::BackgroundSize);
auto const& background_blend_modes = computed_style.property(CSS::PropertyID::BackgroundBlendMode);
auto count_layers = [](auto const& maybe_style_value) -> size_t {
if (maybe_style_value.is_value_list())
@ -510,6 +511,8 @@ void NodeWithStyle::apply_style(CSS::ComputedProperties const& computed_style)
layer.repeat_y = repeat_value->as_background_repeat().repeat_y();
}
layer.blend_mode = CSS::keyword_to_mix_blend_mode(value_for_layer(background_blend_modes, layer_index)->to_keyword()).value_or(CSS::MixBlendMode::Normal);
layers.append(move(layer));
}