| /* |
| * 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 "SkColor.h" |
| #include "SkColorMatrixFilter.h" |
| #include "SkGradientShader.h" |
| #include "SkImage.h" |
| #include "SkShader.h" |
| |
| #include "Test.h" |
| #include "SkRandom.h" |
| |
| const float kTolerance = 1.0f / (1 << 20); |
| |
| static bool nearly_equal(float a, float b, float tol = kTolerance) { |
| SkASSERT(tol >= 0); |
| return fabsf(a - b) <= tol; |
| } |
| |
| static bool nearly_equal(const SkPM4f a, const SkPM4f& b, float tol = kTolerance) { |
| for (int i = 0; i < 4; ++i) { |
| if (!nearly_equal(a.fVec[i], b.fVec[i], tol)) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| DEF_TEST(SkColor4f_FromColor, reporter) { |
| const struct { |
| SkColor fC; |
| SkColor4f fC4; |
| } recs[] = { |
| { SK_ColorBLACK, { 1, 0, 0, 0 } }, |
| { SK_ColorWHITE, { 1, 1, 1, 1 } }, |
| { SK_ColorRED, { 1, 1, 0, 0 } }, |
| { SK_ColorGREEN, { 1, 0, 1, 0 } }, |
| { SK_ColorBLUE, { 1, 0, 0, 1 } }, |
| { 0, { 0, 0, 0, 0 } }, |
| { 0x55AAFF00, { 1/3.0f, 2/3.0f, 1, 0 } }, |
| }; |
| |
| for (const auto& r : recs) { |
| SkColor4f c4 = SkColor4f::FromColor(r.fC); |
| REPORTER_ASSERT(reporter, c4 == r.fC4); |
| } |
| } |
| |
| DEF_TEST(Color4f_premul, reporter) { |
| SkRandom rand; |
| |
| for (int i = 0; i < 1000000; ++i) { |
| // First just test opaque colors, so that the premul should be exact |
| SkColor4f c4 { |
| 1, rand.nextUScalar1(), rand.nextUScalar1(), rand.nextUScalar1() |
| }; |
| SkPM4f pm4 = c4.premul(); |
| REPORTER_ASSERT(reporter, pm4.fVec[SK_A_INDEX] == c4.fA); |
| REPORTER_ASSERT(reporter, pm4.fVec[SK_R_INDEX] == c4.fA * c4.fR); |
| REPORTER_ASSERT(reporter, pm4.fVec[SK_G_INDEX] == c4.fA * c4.fG); |
| REPORTER_ASSERT(reporter, pm4.fVec[SK_B_INDEX] == c4.fA * c4.fB); |
| |
| // We compare with a tolerance, in case our premul multiply is implemented at slightly |
| // different precision than the test code. |
| c4.fA = rand.nextUScalar1(); |
| pm4 = c4.premul(); |
| REPORTER_ASSERT(reporter, pm4.fVec[SK_A_INDEX] == c4.fA); |
| REPORTER_ASSERT(reporter, nearly_equal(pm4.fVec[SK_R_INDEX], c4.fA * c4.fR)); |
| REPORTER_ASSERT(reporter, nearly_equal(pm4.fVec[SK_G_INDEX], c4.fA * c4.fG)); |
| REPORTER_ASSERT(reporter, nearly_equal(pm4.fVec[SK_B_INDEX], c4.fA * c4.fB)); |
| } |
| } |
| |
| ////////////////////////////////////////////////////////////////////////////////////////////////// |
| |
| static SkShader* make_color() { return SkShader::CreateColorShader(0xFFBB8855); } |
| |
| static SkShader* make_image() { |
| const SkImageInfo info = SkImageInfo::MakeN32Premul(2, 2); |
| const SkPMColor pixels[] { |
| SkPackARGB32(0xFF, 0xBB, 0x88, 0x55), |
| SkPackARGB32(0xFF, 0xBB, 0x88, 0x55), |
| SkPackARGB32(0xFF, 0xBB, 0x88, 0x55), |
| SkPackARGB32(0xFF, 0xBB, 0x88, 0x55), |
| }; |
| SkAutoTUnref<SkImage> image(SkImage::NewRasterCopy(info, pixels, sizeof(SkPMColor) * 2)); |
| return image->newShader(SkShader::kClamp_TileMode, SkShader::kClamp_TileMode); |
| } |
| |
| static SkShader* make_grad() { |
| const SkPoint pts[] {{ 0, 0 }, { 100, 100 }}; |
| const SkColor colors[] { SK_ColorRED, SK_ColorBLUE }; |
| return SkGradientShader::CreateLinear(pts, colors, nullptr, 2, SkShader::kClamp_TileMode); |
| } |
| |
| static void compare_spans(const SkPM4f span4f[], const SkPMColor span4b[], int count, |
| skiatest::Reporter* reporter) { |
| for (int i = 0; i < count; ++i) { |
| SkPM4f c0 = SkPM4f::FromPMColor(span4b[i]); |
| SkPM4f c1 = span4f[i]; |
| REPORTER_ASSERT(reporter, nearly_equal(c0, c1, 1.0f/255)); |
| } |
| } |
| |
| DEF_TEST(Color4f_shader, reporter) { |
| struct { |
| SkShader* (*fFact)(); |
| bool fSupports4f; |
| } recs[] = { |
| { make_color, true }, |
| { make_grad, false }, |
| { make_image, false }, |
| }; |
| |
| SkPaint paint; |
| for (const auto& rec : recs) { |
| uint32_t storage[200]; |
| paint.setShader(rec.fFact())->unref(); |
| SkASSERT(paint.getShader()->contextSize() <= sizeof(storage)); |
| SkShader::Context* ctx = paint.getShader()->createContext({paint, SkMatrix::I(), nullptr}, |
| storage); |
| REPORTER_ASSERT(reporter, ctx->supports4f() == rec.fSupports4f); |
| if (ctx->supports4f()) { |
| const int N = 100; |
| SkPM4f buffer4f[N]; |
| ctx->shadeSpan4f(0, 0, buffer4f, N); |
| SkPMColor buffer4b[N]; |
| ctx->shadeSpan(0, 0, buffer4b, N); |
| compare_spans(buffer4f, buffer4b, N, reporter); |
| } |
| ctx->~Context(); |
| } |
| } |
| |
| static SkColorFilter* make_mode_cf() { |
| return SkColorFilter::CreateModeFilter(0xFFBB8855, SkXfermode::kPlus_Mode); |
| } |
| |
| static SkColorFilter* make_mx_cf() { |
| const float mx[] = { |
| 0.5f, 0, 0, 0, 0.1f, |
| 0, 0.5f, 0, 0, 0.2f, |
| 0, 0, 1, 0, -0.1f, |
| 0, 0, 0, 1, 0, |
| }; |
| return SkColorMatrixFilter::Create(mx); |
| } |
| |
| static SkColorFilter* make_compose_cf() { |
| SkAutoTUnref<SkColorFilter> cf0(make_mode_cf()); |
| SkAutoTUnref<SkColorFilter> cf1(make_mx_cf()); |
| return SkColorFilter::CreateComposeFilter(cf0, cf1); |
| } |
| |
| DEF_TEST(Color4f_colorfilter, reporter) { |
| struct { |
| SkColorFilter* (*fFact)(); |
| bool fSupports4f; |
| } recs[] = { |
| { make_mode_cf, false }, |
| { make_mx_cf, true }, |
| { make_compose_cf, false }, |
| }; |
| |
| // prepare the src |
| const int N = 100; |
| SkPMColor src4b[N]; |
| SkPM4f src4f[N]; |
| SkRandom rand; |
| for (int i = 0; i < N; ++i) { |
| src4b[i] = SkPreMultiplyColor(rand.nextU()); |
| src4f[i] = SkPM4f::FromPMColor(src4b[i]); |
| } |
| // confirm that our srcs are (nearly) equal |
| compare_spans(src4f, src4b, N, reporter); |
| |
| for (const auto& rec : recs) { |
| SkAutoTUnref<SkColorFilter> filter(rec.fFact()); |
| REPORTER_ASSERT(reporter, filter->supports4f() == rec.fSupports4f); |
| if (filter->supports4f()) { |
| SkPMColor dst4b[N]; |
| filter->filterSpan(src4b, N, dst4b); |
| SkPM4f dst4f[N]; |
| filter->filterSpan4f(src4f, N, dst4f); |
| compare_spans(dst4f, dst4b, N, reporter); |
| } |
| } |
| } |