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- /*
- * Copyright 2016 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
- #include "include/core/SkTypes.h"
- #include "src/core/SkColorSpaceXformSteps.h"
- #include "src/core/SkRasterPipeline.h"
- #include "tests/Test.h"
- #include <math.h>
- DEF_TEST(srgb_roundtrip, r) {
- for (int normalized = 0; normalized < 2; normalized++) {
- uint32_t reds[256];
- for (int i = 0; i < 256; i++) {
- reds[i] = i;
- }
- SkRasterPipeline_MemoryCtx ptr = { reds, 0 };
- sk_sp<SkColorSpace> sRGB = SkColorSpace::MakeSRGB(),
- linear = sRGB->makeLinearGamma();
- const SkAlphaType upm = kUnpremul_SkAlphaType;
- SkColorSpaceXformSteps linearize{ sRGB.get(),upm, linear.get(),upm},
- reencode {linear.get(),upm, sRGB.get(),upm};
- SkRasterPipeline_<256> p;
- p.append(SkRasterPipeline::load_8888, &ptr);
- linearize.apply(&p, !!normalized);
- reencode .apply(&p, !!normalized);
- p.append(SkRasterPipeline::store_8888, &ptr);
- p.run(0,0,256,1);
- for (int i = 0; i < 256; i++) {
- if (reds[i] != (uint32_t)i) {
- ERRORF(r, "%d doesn't round trip, %d", i, reds[i]);
- }
- }
- }
- }
- DEF_TEST(srgb_edge_cases, r) {
- // We need to run at least 4 pixels to make sure we hit all specializations.
- float colors[4][4] = { {0,1,1,1}, {0,0,0,0}, {0,0,0,0}, {0,0,0,0} };
- auto& color = colors[0];
- SkRasterPipeline_MemoryCtx dst = { &color, 0 };
- sk_sp<SkColorSpace> sRGB = SkColorSpace::MakeSRGB(),
- linear = sRGB->makeLinearGamma();
- const SkAlphaType upm = kUnpremul_SkAlphaType;
- SkColorSpaceXformSteps steps {linear.get(),upm, sRGB.get(),upm};
- SkSTArenaAlloc<256> alloc;
- SkRasterPipeline p(&alloc);
- p.append_constant_color(&alloc, color);
- steps.apply(&p, true/*inputs are normalized*/);
- p.append(SkRasterPipeline::store_f32, &dst);
- p.run(0,0,4,1);
- if (color[0] != 0.0f) {
- ERRORF(r, "expected to_srgb() to map 0.0f to 0.0f, got %f", color[0]);
- }
- if (color[1] != 1.0f) {
- float f = color[1];
- uint32_t x;
- memcpy(&x, &f, 4);
- ERRORF(r, "expected to_srgb() to map 1.0f to 1.0f, got %f (%08x)", color[1], x);
- }
- }
- // Linearize and then re-encode pixel values, testing that the output is close to the input.
- static void test_roundtripping(skiatest::Reporter* r,
- sk_sp<SkColorSpace> cs,
- float range,
- float tolerance,
- bool normalized) {
- static const int kSteps = 128;
- SkColor4f rgba[kSteps];
- auto expected = [=](int i) {
- float scale = range / (3*kSteps);
- return SkColor4f{
- (3*i+0) * scale,
- (3*i+1) * scale,
- (3*i+2) * scale,
- 1.0f,
- };
- };
- for (int i = 0; i < kSteps; i++) {
- rgba[i] = expected(i);
- }
- SkRasterPipeline_MemoryCtx ptr = { rgba, 0 };
- sk_sp<SkColorSpace> linear = cs->makeLinearGamma();
- const SkAlphaType upm = kUnpremul_SkAlphaType;
- SkColorSpaceXformSteps linearize{ cs.get(),upm, linear.get(),upm},
- reencode {linear.get(),upm, cs.get(),upm};
- SkRasterPipeline_<256> p;
- p.append(SkRasterPipeline::load_f32, &ptr);
- linearize.apply(&p, normalized);
- reencode .apply(&p, normalized);
- p.append(SkRasterPipeline::store_f32, &ptr);
- p.run(0,0,kSteps,1);
- auto close = [=](float x, float y) {
- return x == y
- || (x/y < tolerance && y/x < tolerance);
- };
- for (int i = 0; i < kSteps; i++) {
- SkColor4f want = expected(i);
- #if 0
- SkDebugf("got %g %g %g, want %g %g %g\n",
- rgba[i].fR, rgba[i].fG, rgba[i].fB,
- want.fR, want.fG, want.fB);
- #endif
- REPORTER_ASSERT(r, close(rgba[i].fR, want.fR));
- REPORTER_ASSERT(r, close(rgba[i].fG, want.fG));
- REPORTER_ASSERT(r, close(rgba[i].fB, want.fB));
- }
- }
- DEF_TEST(srgb_roundtrip_extended, r) {
- // We're lying when we set normalized=true, but it allows us to test the to_srgb/from_srgb path.
- test_roundtripping(r, SkColorSpace::MakeSRGB(), 2.0f, 1.025f, true);
- // This normalized=false path should have much better round-tripping properties.
- test_roundtripping(r, SkColorSpace::MakeSRGB(), 10000.0f, 1.001f, false);
- }
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