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| 1 /* |
| 2 * Copyright 2015 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 #ifndef GrTestUtils_DEFINED |
| 9 #define GrTestUtils_DEFINED |
| 10 |
| 11 #include "GrColor.h" |
| 12 #include "SkRandom.h" |
| 13 |
| 14 class SkMatrix; |
| 15 |
| 16 namespace GrTest { |
| 17 /** |
| 18 * A helper for use in Test functions. |
| 19 */ |
| 20 const SkMatrix& TestMatrix(SkRandom*); |
| 21 |
| 22 } |
| 23 |
| 24 static inline GrColor GrRandomColor(SkRandom* random) { |
| 25 // There are only a few cases of random colors which interest us |
| 26 enum ColorMode { |
| 27 kAllOnes_ColorMode, |
| 28 kAllZeros_ColorMode, |
| 29 kAlphaOne_ColorMode, |
| 30 kRandom_ColorMode, |
| 31 kLast_ColorMode = kRandom_ColorMode |
| 32 }; |
| 33 |
| 34 ColorMode colorMode = ColorMode(random->nextULessThan(kLast_ColorMode + 1)); |
| 35 GrColor color; |
| 36 switch (colorMode) { |
| 37 case kAllOnes_ColorMode: |
| 38 color = GrColorPackRGBA(0xFF, 0xFF, 0xFF, 0xFF); |
| 39 break; |
| 40 case kAllZeros_ColorMode: |
| 41 color = GrColorPackRGBA(0, 0, 0, 0); |
| 42 break; |
| 43 case kAlphaOne_ColorMode: |
| 44 color = GrColorPackRGBA(random->nextULessThan(256), |
| 45 random->nextULessThan(256), |
| 46 random->nextULessThan(256), |
| 47 0xFF); |
| 48 break; |
| 49 case kRandom_ColorMode: |
| 50 uint8_t alpha = random->nextULessThan(256); |
| 51 color = GrColorPackRGBA(random->nextRangeU(0, alpha), |
| 52 random->nextRangeU(0, alpha), |
| 53 random->nextRangeU(0, alpha), |
| 54 alpha); |
| 55 break; |
| 56 } |
| 57 GrColorIsPMAssert(color); |
| 58 return color; |
| 59 } |
| 60 |
| 61 static inline uint8_t GrRandomCoverage(SkRandom* random) { |
| 62 enum CoverageMode { |
| 63 kZero_CoverageMode, |
| 64 kAllOnes_CoverageMode, |
| 65 kRandom_CoverageMode, |
| 66 kLast_CoverageMode = kRandom_CoverageMode |
| 67 }; |
| 68 |
| 69 CoverageMode colorMode = CoverageMode(random->nextULessThan(kLast_CoverageMo
de + 1)); |
| 70 uint8_t coverage; |
| 71 switch (colorMode) { |
| 72 case kZero_CoverageMode: |
| 73 coverage = 0; |
| 74 case kAllOnes_CoverageMode: |
| 75 coverage = 0xff; |
| 76 break; |
| 77 case kRandom_CoverageMode: |
| 78 coverage = random->nextULessThan(256); |
| 79 break; |
| 80 } |
| 81 return coverage; |
| 82 } |
| 83 |
| 84 #endif |
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