| /* |
| * 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 "SkPM4f.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.a() == c4.fA); |
| REPORTER_ASSERT(reporter, pm4.r() == c4.fA * c4.fR); |
| REPORTER_ASSERT(reporter, pm4.g() == c4.fA * c4.fG); |
| REPORTER_ASSERT(reporter, pm4.b() == 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.r(), c4.fA * c4.fR)); |
| REPORTER_ASSERT(reporter, nearly_equal(pm4.g(), c4.fA * c4.fG)); |
| REPORTER_ASSERT(reporter, nearly_equal(pm4.b(), c4.fA * c4.fB)); |
| } |
| } |
| |
| ////////////////////////////////////////////////////////////////////////////////////////////////// |
| |
| 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); |
| } |
| |
| static SkShader* make_color_sh() { return SkShader::CreateColorShader(0xFFBB8855); } |
| |
| static SkShader* make_image_sh() { |
| 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_sh() { |
| #if 0 |
| const SkPoint pts[] {{ 0, 0 }, { 100, 100 }}; |
| const SkColor colors[] { SK_ColorRED, SK_ColorBLUE }; |
| return SkGradientShader::CreateLinear(pts, colors, nullptr, 2, SkShader::kClamp_TileMode); |
| #else |
| // TODO: need to convert new gradient code to enforce PM4f --> RGBA order |
| return make_color_sh(); |
| #endif |
| } |
| |
| static SkShader* make_cf_sh() { |
| SkAutoTUnref<SkColorFilter> filter(make_mx_cf()); |
| SkAutoTUnref<SkShader> shader(make_color_sh()); |
| return shader->newWithColorFilter(filter); |
| } |
| |
| static bool compare_spans(const SkPM4f span4f[], const SkPMColor span4b[], int count, |
| float tolerance = 1.0f/255) { |
| for (int i = 0; i < count; ++i) { |
| SkPM4f c0 = SkPM4f::FromPMColor(span4b[i]); |
| SkPM4f c1 = span4f[i]; |
| if (!nearly_equal(c0, c1, tolerance)) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| DEF_TEST(Color4f_shader, reporter) { |
| struct { |
| SkShader* (*fFact)(); |
| bool fSupports4f; |
| float fTolerance; |
| } recs[] = { |
| { make_color_sh, true, 1.0f/255 }, |
| // PMColor 4f gradients are interpolated in 255-multiplied values, so we need a |
| // slightly relaxed tolerance to accommodate the cumulative precision deviation. |
| { make_grad_sh, true, 1.001f/255 }, |
| { make_image_sh, false, 1.0f/255 }, |
| { make_cf_sh, true, 1.0f/255 }, |
| }; |
| |
| SkPaint paint; |
| for (const auto& rec : recs) { |
| uint32_t storage[300]; |
| paint.setShader(rec.fFact())->unref(); |
| // Encourage 4f context selection. At some point we may need |
| // to instantiate two separate contexts for optimal 4b/4f selection. |
| const SkShader::ContextRec contextRec(paint, SkMatrix::I(), nullptr, |
| SkShader::ContextRec::kPM4f_DstType); |
| SkASSERT(paint.getShader()->contextSize(contextRec) <= sizeof(storage)); |
| SkShader::Context* ctx = paint.getShader()->createContext(contextRec, storage); |
| if (rec.fSupports4f) { |
| const int N = 100; |
| SkPM4f buffer4f[N]; |
| ctx->shadeSpan4f(0, 0, buffer4f, N); |
| SkPMColor buffer4b[N]; |
| ctx->shadeSpan(0, 0, buffer4b, N); |
| REPORTER_ASSERT(reporter, compare_spans(buffer4f, buffer4b, N, rec.fTolerance)); |
| } |
| ctx->~Context(); |
| } |
| } |
| |
| DEF_TEST(Color4f_colorfilter, reporter) { |
| struct { |
| SkColorFilter* (*fFact)(); |
| bool fSupports4f; |
| const char* fName; |
| } recs[] = { |
| { make_mode_cf, true, "mode" }, |
| { make_mx_cf, true, "matrix" }, |
| { make_compose_cf, true, "compose" }, |
| }; |
| |
| // 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 |
| REPORTER_ASSERT(reporter, compare_spans(src4f, src4b, N)); |
| |
| for (const auto& rec : recs) { |
| SkAutoTUnref<SkColorFilter> filter(rec.fFact()); |
| SkPMColor dst4b[N]; |
| filter->filterSpan(src4b, N, dst4b); |
| SkPM4f dst4f[N]; |
| filter->filterSpan4f(src4f, N, dst4f); |
| REPORTER_ASSERT(reporter, compare_spans(dst4f, dst4b, N)); |
| } |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////////////////////////// |
| |
| typedef SkPM4f (*SkXfermodeProc4f)(const SkPM4f& src, const SkPM4f& dst); |
| |
| static bool compare_procs(SkXfermodeProc proc32, SkXfermodeProc4f proc4f) { |
| const float kTolerance = 1.0f / 255; |
| |
| const SkColor colors[] = { |
| 0, 0xFF000000, 0xFFFFFFFF, 0x80FF0000 |
| }; |
| |
| for (auto s32 : colors) { |
| SkPMColor s_pm32 = SkPreMultiplyColor(s32); |
| SkPM4f s_pm4f = SkColor4f::FromColor(s32).premul(); |
| for (auto d32 : colors) { |
| SkPMColor d_pm32 = SkPreMultiplyColor(d32); |
| SkPM4f d_pm4f = SkColor4f::FromColor(d32).premul(); |
| |
| SkPMColor r32 = proc32(s_pm32, d_pm32); |
| SkPM4f r4f = proc4f(s_pm4f, d_pm4f); |
| |
| SkPM4f r32_4f = SkPM4f::FromPMColor(r32); |
| if (!nearly_equal(r4f, r32_4f, kTolerance)) { |
| return false; |
| } |
| } |
| } |
| return true; |
| } |
| |
| // Check that our Proc and Proc4f return (nearly) the same results |
| // |
| DEF_TEST(Color4f_xfermode_proc4f, reporter) { |
| // TODO: extend xfermodes so that all cases can be tested. |
| // |
| for (int mode = SkXfermode::kClear_Mode; mode <= SkXfermode::kScreen_Mode; ++mode) { |
| SkXfermodeProc proc32 = SkXfermode::GetProc((SkXfermode::Mode)mode); |
| SkXfermodeProc4f proc4f = SkXfermode::GetProc4f((SkXfermode::Mode)mode); |
| REPORTER_ASSERT(reporter, compare_procs(proc32, proc4f)); |
| } |
| } |