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LibWeb: Use box sampling instead of bilinear scaling when downscaling

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As a heuristic, either the width or height of the scaled image should
decrease for box sampling to be used. Otherwise, we use bilinear
scaling.
This commit is contained in:
Jelle Raaijmakers 2023-05-19 00:41:12 +02:00 • committed by Andreas Kling
parent 81b30ec372
commit b79fd3d1a9
5 changed files with 13 additions and 6 deletions
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4
Userland/Libraries/LibWeb/CSS/ComputedValues.h
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@ -185,12 +185,14 @@ struct BorderRadiusData {
};
// FIXME: Find a better place for this helper.
inline Gfx::Painter::ScalingMode to_gfx_scaling_mode(CSS::ImageRendering css_value)
inline Gfx::Painter::ScalingMode to_gfx_scaling_mode(CSS::ImageRendering css_value, Gfx::IntRect source, Gfx::IntRect target)
{
switch (css_value) {
case CSS::ImageRendering::Auto:
case CSS::ImageRendering::HighQuality:
case CSS::ImageRendering::Smooth:
if (target.width() < source.width() || target.height() < source.height())
return Gfx::Painter::ScalingMode::BoxSampling;
return Gfx::Painter::ScalingMode::BilinearBlend;
case CSS::ImageRendering::CrispEdges:
return Gfx::Painter::ScalingMode::NearestNeighbor;