94 lines
2.5 KiB
C++
94 lines
2.5 KiB
C++
/*
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* Copyright 2015 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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#ifndef GrTestUtils_DEFINED
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#define GrTestUtils_DEFINED
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#include "SkTypes.h"
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#ifdef GR_TEST_UTILS
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#include "GrColor.h"
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#include "SkRandom.h"
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class SkMatrix;
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struct SkRect;
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namespace GrTest {
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/**
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* A helper for use in Test functions.
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*/
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const SkMatrix& TestMatrix(SkRandom*);
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const SkMatrix& TestMatrixPreservesRightAngles(SkRandom*);
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const SkRect& TestRect(SkRandom*);
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}
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static inline GrColor GrRandomColor(SkRandom* random) {
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// There are only a few cases of random colors which interest us
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enum ColorMode {
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kAllOnes_ColorMode,
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kAllZeros_ColorMode,
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kAlphaOne_ColorMode,
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kRandom_ColorMode,
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kLast_ColorMode = kRandom_ColorMode
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};
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ColorMode colorMode = ColorMode(random->nextULessThan(kLast_ColorMode + 1));
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GrColor color;
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switch (colorMode) {
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case kAllOnes_ColorMode:
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color = GrColorPackRGBA(0xFF, 0xFF, 0xFF, 0xFF);
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break;
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case kAllZeros_ColorMode:
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color = GrColorPackRGBA(0, 0, 0, 0);
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break;
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case kAlphaOne_ColorMode:
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color = GrColorPackRGBA(random->nextULessThan(256),
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random->nextULessThan(256),
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random->nextULessThan(256),
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0xFF);
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break;
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case kRandom_ColorMode: {
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uint8_t alpha = random->nextULessThan(256);
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color = GrColorPackRGBA(random->nextRangeU(0, alpha),
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random->nextRangeU(0, alpha),
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random->nextRangeU(0, alpha),
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alpha);
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break;
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}
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}
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GrColorIsPMAssert(color);
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return color;
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}
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static inline uint8_t GrRandomCoverage(SkRandom* random) {
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enum CoverageMode {
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kZero_CoverageMode,
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kAllOnes_CoverageMode,
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kRandom_CoverageMode,
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kLast_CoverageMode = kRandom_CoverageMode
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};
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CoverageMode colorMode = CoverageMode(random->nextULessThan(kLast_CoverageMode + 1));
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uint8_t coverage;
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switch (colorMode) {
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case kZero_CoverageMode:
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coverage = 0;
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case kAllOnes_CoverageMode:
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coverage = 0xff;
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break;
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case kRandom_CoverageMode:
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coverage = random->nextULessThan(256);
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break;
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}
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return coverage;
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}
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#endif
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#endif
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