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LibWeb: Use premultiplied alpha for gradient interpolation in Skia

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This change fixes the rest of regressions in
Tests/LibWeb/Ref/css-gradients.html
This commit is contained in:
Aliaksandr Kalenik 2024-07-18 14:05:30 +03:00 committed by Andreas Kling
parent 0c14a9417a
commit 1e4720700c
Notes: sideshowbarker 2024-07-18 23:45:54 +09:00 
Author: https://github.com/kalenikaliaksandr
Commit: https://github.com/LadybirdBrowser/ladybird/commit/1e4720700c0
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/694
1 changed files with 31 additions and 11 deletions
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42
Userland/Libraries/LibWeb/Painting/DisplayListPlayerSkia.cpp
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@ -222,6 +222,16 @@ static SkColor to_skia_color(Gfx::Color const& color)
return SkColorSetARGB(color.alpha(), color.red(), color.green(), color.blue());
}
static SkColor4f to_skia_color4f(Gfx::Color const& color)
{
return {
.fR = color.red() / 255.0f,
.fG = color.green() / 255.0f,
.fB = color.blue() / 255.0f,
.fA = color.alpha() / 255.0f,
};
}
static SkPath to_skia_path(Gfx::Path const& path)
{
Optional<Gfx::FloatPoint> subpath_start_point;
@ -643,14 +653,13 @@ CommandResult DisplayListPlayerSkia::paint_linear_gradient(PaintLinearGradient c
auto stops_with_replaced_transition_hints = replace_transition_hints_with_normal_color_stops(color_stop_list);
Vector<SkColor> colors;
Vector<SkColor4f> colors;
Vector<SkScalar> positions;
for (size_t stop_index = 0; stop_index < stops_with_replaced_transition_hints.size(); stop_index++) {
auto const& stop = stops_with_replaced_transition_hints[stop_index];
if (stop_index > 0 && stop == stops_with_replaced_transition_hints[stop_index - 1])
continue;
colors.append(to_skia_color(stop.color));
colors.append(to_skia_color4f(stop.color));
positions.append(stop.position);
}
@ -667,7 +676,11 @@ CommandResult DisplayListPlayerSkia::paint_linear_gradient(PaintLinearGradient c
SkMatrix matrix;
matrix.setRotate(linear_gradient_data.gradient_angle, center.x(), center.y());
auto shader = SkGradientShader::MakeLinear(points.data(), colors.data(), positions.data(), positions.size(), SkTileMode::kClamp, 0, &matrix);
auto color_space = SkColorSpace::MakeSRGB();
SkGradientShader::Interpolation interpolation = {};
interpolation.fColorSpace = SkGradientShader::Interpolation::ColorSpace::kSRGB;
interpolation.fInPremul = SkGradientShader::Interpolation::InPremul::kYes;
auto shader = SkGradientShader::MakeLinear(points.data(), colors.data(), color_space, positions.data(), positions.size(), SkTileMode::kClamp, interpolation, &matrix);
SkPaint paint;
paint.setShader(shader);
@ -1200,14 +1213,13 @@ CommandResult DisplayListPlayerSkia::paint_radial_gradient(PaintRadialGradient c
auto stops_with_replaced_transition_hints = replace_transition_hints_with_normal_color_stops(color_stop_list);
Vector<SkColor> colors;
Vector<SkColor4f> colors;
Vector<SkScalar> positions;
for (size_t stop_index = 0; stop_index < stops_with_replaced_transition_hints.size(); stop_index++) {
auto const& stop = stops_with_replaced_transition_hints[stop_index];
if (stop_index > 0 && stop == stops_with_replaced_transition_hints[stop_index - 1])
continue;
colors.append(to_skia_color(stop.color));
colors.append(to_skia_color4f(stop.color));
positions.append(stop.position);
}
@ -1224,7 +1236,11 @@ CommandResult DisplayListPlayerSkia::paint_radial_gradient(PaintRadialGradient c
if (repeat_length.has_value())
tile_mode = SkTileMode::kRepeat;
auto shader = SkGradientShader::MakeRadial(center, size.height(), colors.data(), positions.data(), positions.size(), tile_mode, 0, &matrix);
auto color_space = SkColorSpace::MakeSRGB();
SkGradientShader::Interpolation interpolation = {};
interpolation.fColorSpace = SkGradientShader::Interpolation::ColorSpace::kSRGB;
interpolation.fInPremul = SkGradientShader::Interpolation::InPremul::kYes;
auto shader = SkGradientShader::MakeRadial(center, size.height(), colors.data(), color_space, positions.data(), positions.size(), tile_mode, interpolation, &matrix);
SkPaint paint;
paint.setShader(shader);
@ -1247,13 +1263,13 @@ CommandResult DisplayListPlayerSkia::paint_conic_gradient(PaintConicGradient con
VERIFY(!color_stop_list.is_empty());
auto stops_with_replaced_transition_hints = replace_transition_hints_with_normal_color_stops(color_stop_list);
Vector<SkColor> colors;
Vector<SkColor4f> colors;
Vector<SkScalar> positions;
for (size_t stop_index = 0; stop_index < stops_with_replaced_transition_hints.size(); stop_index++) {
auto const& stop = stops_with_replaced_transition_hints[stop_index];
if (stop_index > 0 && stop == stops_with_replaced_transition_hints[stop_index - 1])
continue;
colors.append(to_skia_color(stop.color));
colors.append(to_skia_color4f(stop.color));
positions.append(stop.position);
}
@ -1262,7 +1278,11 @@ CommandResult DisplayListPlayerSkia::paint_conic_gradient(PaintConicGradient con
SkMatrix matrix;
matrix.setRotate(-90 + conic_gradient_data.start_angle, center.x(), center.y());
auto shader = SkGradientShader::MakeSweep(center.x(), center.y(), colors.data(), positions.data(), positions.size(), SkTileMode::kRepeat, 0, 360, 0, &matrix);
auto color_space = SkColorSpace::MakeSRGB();
SkGradientShader::Interpolation interpolation = {};
interpolation.fColorSpace = SkGradientShader::Interpolation::ColorSpace::kSRGB;
interpolation.fInPremul = SkGradientShader::Interpolation::InPremul::kYes;
auto shader = SkGradientShader::MakeSweep(center.x(), center.y(), colors.data(), color_space, positions.data(), positions.size(), SkTileMode::kRepeat, 0, 360, interpolation, &matrix);
SkPaint paint;
paint.setShader(shader);