| /* |
| * 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 "SkBitmapProcShader.h" |
| #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, { 0, 0, 0, 1 } }, |
| { SK_ColorWHITE, { 1, 1, 1, 1 } }, |
| { SK_ColorRED, { 1, 0, 0, 1 } }, |
| { SK_ColorGREEN, { 0, 1, 0, 1 } }, |
| { SK_ColorBLUE, { 0, 0, 1, 1 } }, |
| { 0, { 0, 0, 0, 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 { |
| rand.nextUScalar1(), rand.nextUScalar1(), rand.nextUScalar1(), 1 |
| }; |
| 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)); |
| } |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////////////////////////// |
| |
| 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 = (int)SkBlendMode::kClear; mode <= (int)SkBlendMode::kScreen; ++mode) { |
| SkXfermodeProc proc32 = SkXfermode::GetProc((SkBlendMode)mode); |
| SkXfermodeProc4f proc4f = SkXfermode::GetProc4f((SkBlendMode)mode); |
| REPORTER_ASSERT(reporter, compare_procs(proc32, proc4f)); |
| } |
| } |