1 /* 2 * Copyright 2016 Google Inc. 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #include "SkBitmapProcShader.h" 9 #include "SkColor.h" 10 #include "SkColorMatrixFilter.h" 11 #include "SkGradientShader.h" 12 #include "SkImage.h" 13 #include "SkPM4f.h" 14 #include "SkShader.h" 15 16 #include "Test.h" 17 #include "SkRandom.h" 18 19 const float kTolerance = 1.0f / (1 << 20); 20 21 static bool nearly_equal(float a, float b, float tol = kTolerance) { 22 SkASSERT(tol >= 0); 23 return fabsf(a - b) <= tol; 24 } 25 26 DEF_TEST(SkColor4f_FromColor, reporter) { 27 const struct { 28 SkColor fC; 29 SkColor4f fC4; 30 } recs[] = { 31 { SK_ColorBLACK, { 0, 0, 0, 1 } }, 32 { SK_ColorWHITE, { 1, 1, 1, 1 } }, 33 { SK_ColorRED, { 1, 0, 0, 1 } }, 34 { SK_ColorGREEN, { 0, 1, 0, 1 } }, 35 { SK_ColorBLUE, { 0, 0, 1, 1 } }, 36 { 0, { 0, 0, 0, 0 } }, 37 }; 38 39 for (const auto& r : recs) { 40 SkColor4f c4 = SkColor4f::FromColor(r.fC); 41 REPORTER_ASSERT(reporter, c4 == r.fC4); 42 } 43 } 44 45 DEF_TEST(Color4f_premul, reporter) { 46 SkRandom rand; 47 48 for (int i = 0; i < 1000000; ++i) { 49 // First just test opaque colors, so that the premul should be exact 50 SkColor4f c4 { 51 rand.nextUScalar1(), rand.nextUScalar1(), rand.nextUScalar1(), 1 52 }; 53 SkPM4f pm4 = c4.premul(); 54 REPORTER_ASSERT(reporter, pm4.a() == c4.fA); 55 REPORTER_ASSERT(reporter, pm4.r() == c4.fA * c4.fR); 56 REPORTER_ASSERT(reporter, pm4.g() == c4.fA * c4.fG); 57 REPORTER_ASSERT(reporter, pm4.b() == c4.fA * c4.fB); 58 59 // We compare with a tolerance, in case our premul multiply is implemented at slightly 60 // different precision than the test code. 61 c4.fA = rand.nextUScalar1(); 62 pm4 = c4.premul(); 63 REPORTER_ASSERT(reporter, pm4.fVec[SK_A_INDEX] == c4.fA); 64 REPORTER_ASSERT(reporter, nearly_equal(pm4.r(), c4.fA * c4.fR)); 65 REPORTER_ASSERT(reporter, nearly_equal(pm4.g(), c4.fA * c4.fG)); 66 REPORTER_ASSERT(reporter, nearly_equal(pm4.b(), c4.fA * c4.fB)); 67 } 68 } 69
