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* Copyright 2017 Google Inc.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
#include "Test.h"
#include "SkColorSpace.h"
#include "SkTableColorFilter.h"
#include "SkToSRGBColorFilter.h"
// SkToSRGBColorFilter makes it easy to create out of range (>1, <0) color values.
// Those can be dangerous as inputs to naive implementation of SkTableColorFilter.
// This tests that our implementation is safe.
DEF_TEST(TableColorFilter, r) {
// Using a wide source gamut will make saturated colors go well out of range of sRGB.
auto rec2020 = SkColorSpace::MakeRGB(SkColorSpace::kSRGB_RenderTargetGamma,
sk_sp<SkColorFilter> to_srgb = SkToSRGBColorFilter::Make(rec2020);
// Any table will work fine here. An identity table makes testing easy.
uint8_t identity[256];
for (int i = 0; i < 256; i++) {
identity[i] = i;
sk_sp<SkColorFilter> table = SkTableColorFilter::Make(identity);
// The rec2020 primaries are not representable in sRGB, but will clamp to the sRGB primaries.
SkColor colors[] = { SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE };
sk_sp<SkColorFilter> composed = SkColorFilter::MakeComposeFilter(table, to_srgb);
for (auto color : colors) {
REPORTER_ASSERT(r, composed->filterColor(color) == color);