63 lines
2.1 KiB
C++
63 lines
2.1 KiB
C++
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/*
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* Copyright 2016 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "SkColor.h"
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#include "SkShader.h"
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#include "SkColorMatrixFilter.h"
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#include "Test.h"
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#include "SkRandom.h"
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DEF_TEST(SkColor4f_FromColor, reporter) {
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const struct {
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SkColor fC;
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SkColor4f fC4;
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} recs[] = {
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{ SK_ColorBLACK, { 1, 0, 0, 0 } },
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{ SK_ColorWHITE, { 1, 1, 1, 1 } },
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{ SK_ColorRED, { 1, 1, 0, 0 } },
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{ SK_ColorGREEN, { 1, 0, 1, 0 } },
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{ SK_ColorBLUE, { 1, 0, 0, 1 } },
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{ 0, { 0, 0, 0, 0 } },
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{ 0x55AAFF00, { 1/3.0f, 2/3.0f, 1, 0 } },
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};
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for (const auto& r : recs) {
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SkColor4f c4 = SkColor4f::FromColor(r.fC);
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REPORTER_ASSERT(reporter, c4 == r.fC4);
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}
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}
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static bool nearly_equal(float a, float b) {
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const float kTolerance = 1.0f / (1 << 20);
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return fabsf(a - b) < kTolerance;
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}
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DEF_TEST(SkColor4f_premul, reporter) {
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SkRandom rand;
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for (int i = 0; i < 1000000; ++i) {
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// First just test opaque colors, so that the premul should be exact
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SkColor4f c4 {
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1, rand.nextUScalar1(), rand.nextUScalar1(), rand.nextUScalar1()
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};
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SkPM4f pm4 = c4.premul();
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REPORTER_ASSERT(reporter, pm4.fVec[SK_A_INDEX] == c4.fA);
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REPORTER_ASSERT(reporter, pm4.fVec[SK_R_INDEX] == c4.fA * c4.fR);
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REPORTER_ASSERT(reporter, pm4.fVec[SK_G_INDEX] == c4.fA * c4.fG);
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REPORTER_ASSERT(reporter, pm4.fVec[SK_B_INDEX] == c4.fA * c4.fB);
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// We compare with a tolerance, in case our premul multiply is implemented at slightly
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// different precision than the test code.
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c4.fA = rand.nextUScalar1();
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pm4 = c4.premul();
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REPORTER_ASSERT(reporter, pm4.fVec[SK_A_INDEX] == c4.fA);
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REPORTER_ASSERT(reporter, nearly_equal(pm4.fVec[SK_R_INDEX], c4.fA * c4.fR));
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REPORTER_ASSERT(reporter, nearly_equal(pm4.fVec[SK_G_INDEX], c4.fA * c4.fG));
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REPORTER_ASSERT(reporter, nearly_equal(pm4.fVec[SK_B_INDEX], c4.fA * c4.fB));
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}
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}
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