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LibWeb: Snap transformed stacking contexts to pixel grid

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Make sure that we're painting them at an integer pixel position, to
avoid smearing.
This commit is contained in:
Andreas Kling 2022-07-20 22:02:56 +02:00
parent e095b9c6f9
commit a6e1b9eed2
1 changed files with 6 additions and 1 deletions
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7
Userland/Libraries/LibWeb/Painting/StackingContext.cpp
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@ -295,7 +295,12 @@ void StackingContext::paint(PaintContext& context) const
auto transformed_destination_rect = affine_transform.map(source_rect).translated(transform_origin);
source_rect.translate_by(transform_origin);
context.painter().draw_scaled_bitmap(transformed_destination_rect.to_rounded<int>(), *bitmap, source_rect, opacity, Gfx::Painter::ScalingMode::BilinearBlend);
// NOTE: If the destination and source rects are the same size, we round the source rect to ensure that it's pixel-aligned.
if (transformed_destination_rect.size() == source_rect.size())
context.painter().draw_scaled_bitmap(transformed_destination_rect.to_rounded<int>(), *bitmap, source_rect.to_rounded<int>(), opacity);
else
context.painter().draw_scaled_bitmap(transformed_destination_rect.to_rounded<int>(), *bitmap, source_rect, opacity, Gfx::Painter::ScalingMode::BilinearBlend);
} else {
paint_internal(context);
}