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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/viz/common/skia_helper.h"
#include <array>
#include <utility>
#include "base/check.h"
#include "base/strings/strcat.h"
#include "base/strings/string_number_conversions.h"
#include "third_party/skia/include/core/SkColorFilter.h"
#include "third_party/skia/include/effects/SkColorMatrix.h"
#include "third_party/skia/include/effects/SkImageFilters.h"
#include "third_party/skia/include/effects/SkOverdrawColorFilter.h"
#include "third_party/skia/include/effects/SkRuntimeEffect.h"
namespace viz {
sk_sp<SkColorFilter> SkiaHelper::MakeOverdrawColorFilter() {
#if BUILDFLAG(IS_ANDROID)
static const SkColor colors[SkOverdrawColorFilter::kNumColors] = {
0x00000000, 0x00000000, 0x2f0000ff, 0x2f00ff00, 0x3fff0000, 0x7fff0000,
};
return SkOverdrawColorFilter::MakeWithSkColors(colors);
#else
constexpr int kNumColors = 9;
static const std::array<SkColor, kNumColors> colors = {
/*no-color=*/0x00000000, /*no-color=*/0x00000000,
/*blue=*/0x2f0000ff, /*green=*/0x2f00ff00,
/*light-red=*/0x3fff0000,
/*red=*/0x7fff0000, /*orange=*/0x9fff8c00,
/*purple=*/0x9f6A0DAD, /*wine=*/0x9f2C041C};
static constexpr char kOverdrawFilterCode[] =
"uniform half4 color0, color1, color2, color3, color4, color5, color6, "
"color7, color8;"
"half4 main(half4 color) {"
"return color.a < (0.5 / 255.) ? color0"
": color.a < (1.5 / 255.) ? color1"
": color.a < (2.5 / 255.) ? color2"
": color.a < (3.5 / 255.) ? color3"
": color.a < (4.5 / 255.) ? color4"
": color.a < (5.5 / 255.) ? color5"
": color.a < (6.5 / 255.) ? color6"
": color.a < (7.5 / 255.) ? color7"
": color8;"
"}";
static auto* const overdraw_effect =
SkRuntimeEffect::MakeForColorFilter(SkString(kOverdrawFilterCode))
.effect.release();
CHECK(overdraw_effect);
SkRuntimeColorFilterBuilder builder(sk_ref_sp(overdraw_effect));
for (int i = 0; i < kNumColors; i++) {
builder.uniform(base::StrCat({"color", base::NumberToString(i)})) =
SkColor4f::FromColor(colors[i]).premul();
}
return builder.makeColorFilter();
#endif
}
sk_sp<SkImageFilter> SkiaHelper::BuildOpacityFilter(float opacity) {
SkColorMatrix matrix;
matrix.setScale(1.f, 1.f, 1.f, opacity);
return SkImageFilters::ColorFilter(SkColorFilters::Matrix(matrix), nullptr);
}
} // namespace viz
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