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Code Issues Projects Releases Packages Wiki Activity Actions 9

LibGfx+LibWeb: Turn Gfx::Filter into a SkImageFilter wrapper

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This commit is contained in:
Lucien Fiorini 2025-05-11 12:44:54 +02:00 • committed by Alexander Kalenik
commit 0fcb574041
Notes: github-actions[bot] 2025-06-01 21:23:19 +00:00
26 changed files with 412 additions and 256 deletions
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122
Libraries/LibGfx/SkiaUtils.cpp
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@ -6,12 +6,11 @@
#include <AK/Assertions.h>
#include <LibGfx/Filter.h>
#include <LibGfx/FilterImpl.h>
#include <LibGfx/SkiaUtils.h>
#include <core/SkBlender.h>
#include <core/SkColorFilter.h>
#include <core/SkImageFilter.h>
#include <core/SkString.h>
#include <effects/SkImageFilters.h>
#include <effects/SkRuntimeEffect.h>
namespace Gfx {
@ -23,124 +22,7 @@ SkPath to_skia_path(Path const& path)
sk_sp<SkImageFilter> to_skia_image_filter(Gfx::Filter const& filter)
{
// See: https://drafts.fxtf.org/filter-effects-1/#supported-filter-functions
return filter.visit(
[&](Gfx::BlurFilter blur_filter) {
return SkImageFilters::Blur(blur_filter.radius, blur_filter.radius, nullptr);
},
[&](Gfx::ColorFilter color_filter) {
sk_sp<SkColorFilter> skia_color_filter;
float amount = color_filter.amount;
// Matrices are taken from https://drafts.fxtf.org/filter-effects-1/#FilterPrimitiveRepresentation
switch (color_filter.type) {
case ColorFilter::Type::Grayscale: {
float matrix[20] = {
0.2126f + 0.7874f * (1 - amount), 0.7152f - 0.7152f * (1 - amount), 0.0722f - 0.0722f * (1 - amount), 0, 0,
0.2126f - 0.2126f * (1 - amount), 0.7152f + 0.2848f * (1 - amount), 0.0722f - 0.0722f * (1 - amount), 0, 0,
0.2126f - 0.2126f * (1 - amount), 0.7152f - 0.7152f * (1 - amount), 0.0722f + 0.9278f * (1 - amount), 0, 0,
0, 0, 0, 1, 0
};
skia_color_filter = SkColorFilters::Matrix(matrix, SkColorFilters::Clamp::kYes);
break;
}
case Gfx::ColorFilter::Type::Brightness: {
float matrix[20] = {
amount, 0, 0, 0, 0,
0, amount, 0, 0, 0,
0, 0, amount, 0, 0,
0, 0, 0, 1, 0
};
skia_color_filter = SkColorFilters::Matrix(matrix, SkColorFilters::Clamp::kNo);
break;
}
case Gfx::ColorFilter::Type::Contrast: {
float intercept = -(0.5f * amount) + 0.5f;
float matrix[20] = {
amount, 0, 0, 0, intercept,
0, amount, 0, 0, intercept,
0, 0, amount, 0, intercept,
0, 0, 0, 1, 0
};
skia_color_filter = SkColorFilters::Matrix(matrix, SkColorFilters::Clamp::kNo);
break;
}
case Gfx::ColorFilter::Type::Invert: {
float matrix[20] = {
1 - 2 * amount, 0, 0, 0, amount,
0, 1 - 2 * amount, 0, 0, amount,
0, 0, 1 - 2 * amount, 0, amount,
0, 0, 0, 1, 0
};
skia_color_filter = SkColorFilters::Matrix(matrix, SkColorFilters::Clamp::kYes);
break;
}
case Gfx::ColorFilter::Type::Opacity: {
float matrix[20] = {
1, 0, 0, 0, 0,
0, 1, 0, 0, 0,
0, 0, 1, 0, 0,
0, 0, 0, amount, 0
};
skia_color_filter = SkColorFilters::Matrix(matrix, SkColorFilters::Clamp::kYes);
break;
}
case Gfx::ColorFilter::Type::Sepia: {
float matrix[20] = {
0.393f + 0.607f * (1 - amount), 0.769f - 0.769f * (1 - amount), 0.189f - 0.189f * (1 - amount), 0, 0,
0.349f - 0.349f * (1 - amount), 0.686f + 0.314f * (1 - amount), 0.168f - 0.168f * (1 - amount), 0, 0,
0.272f - 0.272f * (1 - amount), 0.534f - 0.534f * (1 - amount), 0.131f + 0.869f * (1 - amount), 0, 0,
0, 0, 0, 1, 0
};
skia_color_filter = SkColorFilters::Matrix(matrix, SkColorFilters::Clamp::kYes);
break;
}
case Gfx::ColorFilter::Type::Saturate: {
float matrix[20] = {
0.213f + 0.787f * amount, 0.715f - 0.715f * amount, 0.072f - 0.072f * amount, 0, 0,
0.213f - 0.213f * amount, 0.715f + 0.285f * amount, 0.072f - 0.072f * amount, 0, 0,
0.213f - 0.213f * amount, 0.715f - 0.715f * amount, 0.072f + 0.928f * amount, 0, 0,
0, 0, 0, 1, 0
};
skia_color_filter = SkColorFilters::Matrix(matrix, SkColorFilters::Clamp::kNo);
break;
}
default:
VERIFY_NOT_REACHED();
}
return SkImageFilters::ColorFilter(skia_color_filter, nullptr);
},
[&](Gfx::HueRotateFilter hue_rotate_filter) {
float radians = AK::to_radians(hue_rotate_filter.angle_degrees);
auto cosA = cos(radians);
auto sinA = sin(radians);
auto a00 = 0.213f + cosA * 0.787f - sinA * 0.213f;
auto a01 = 0.715f - cosA * 0.715f - sinA * 0.715f;
auto a02 = 0.072f - cosA * 0.072f + sinA * 0.928f;
auto a10 = 0.213f - cosA * 0.213f + sinA * 0.143f;
auto a11 = 0.715f + cosA * 0.285f + sinA * 0.140f;
auto a12 = 0.072f - cosA * 0.072f - sinA * 0.283f;
auto a20 = 0.213f - cosA * 0.213f - sinA * 0.787f;
auto a21 = 0.715f - cosA * 0.715f + sinA * 0.715f;
auto a22 = 0.072f + cosA * 0.928f + sinA * 0.072f;
float matrix[20] = {
a00, a01, a02, 0, 0,
a10, a11, a12, 0, 0,
a20, a21, a22, 0, 0,
0, 0, 0, 1, 0
};
auto filter = SkColorFilters::Matrix(matrix, SkColorFilters::Clamp::kNo);
return SkImageFilters::ColorFilter(filter, nullptr);
},
[&](Gfx::DropShadowFilter drop_shadow_filter) {
auto shadow_color = to_skia_color(drop_shadow_filter.color);
return SkImageFilters::DropShadow(drop_shadow_filter.offset_x, drop_shadow_filter.offset_y, drop_shadow_filter.radius, drop_shadow_filter.radius, shadow_color, nullptr);
});
return filter.impl().filter;
}
sk_sp<SkBlender> to_skia_blender(Gfx::CompositingAndBlendingOperator compositing_and_blending_operator)