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| 1 /* libs/graphics/sgl/SkBitmapSampler.h | |
| 2 ** | |
| 3 ** Copyright 2006, The Android Open Source Project | |
| 4 ** | |
| 5 ** Licensed under the Apache License, Version 2.0 (the "License"); | |
| 6 ** you may not use this file except in compliance with the License. | |
| 7 ** You may obtain a copy of the License at | |
| 8 ** | |
| 9 ** http://www.apache.org/licenses/LICENSE-2.0 | |
| 10 ** | |
| 11 ** Unless required by applicable law or agreed to in writing, software | |
| 12 ** distributed under the License is distributed on an "AS IS" BASIS, | |
| 13 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
| 14 ** See the License for the specific language governing permissions and | |
| 15 ** limitations under the License. | |
| 16 */ | |
| 17 | |
| 18 #ifndef SkBitmapSampler_DEFINED | |
| 19 #define SkBitmapSampler_DEFINED | |
| 20 | |
| 21 #include "SkBitmap.h" | |
| 22 #include "SkPaint.h" | |
| 23 #include "SkShader.h" | |
| 24 | |
| 25 typedef int (*SkTileModeProc)(int value, unsigned max); | |
| 26 | |
| 27 class SkBitmapSampler { | |
| 28 public: | |
| 29 SkBitmapSampler(const SkBitmap&, bool filter, SkShader::TileMode tmx, SkShad
er::TileMode tmy); | |
| 30 virtual ~SkBitmapSampler() {} | |
| 31 | |
| 32 const SkBitmap& getBitmap() const { return fBitmap; } | |
| 33 bool getFilterBitmap() const { return fFilterBitmap; } | |
| 34 SkShader::TileMode getTileModeX() const { return fTileModeX; } | |
| 35 SkShader::TileMode getTileModeY() const { return fTileModeY; } | |
| 36 | |
| 37 /** Given a pixel center at [x,y], return the color sample | |
| 38 */ | |
| 39 virtual SkPMColor sample(SkFixed x, SkFixed y) const = 0; | |
| 40 | |
| 41 virtual void setPaint(const SkPaint& paint); | |
| 42 | |
| 43 // This is the factory for finding an optimal subclass | |
| 44 static SkBitmapSampler* Create(const SkBitmap&, bool filter, | |
| 45 SkShader::TileMode tmx, SkShader::TileMode tm
y); | |
| 46 | |
| 47 protected: | |
| 48 const SkBitmap& fBitmap; | |
| 49 uint16_t fMaxX, fMaxY; | |
| 50 bool fFilterBitmap; | |
| 51 SkShader::TileMode fTileModeX; | |
| 52 SkShader::TileMode fTileModeY; | |
| 53 SkTileModeProc fTileProcX; | |
| 54 SkTileModeProc fTileProcY; | |
| 55 | |
| 56 // illegal | |
| 57 SkBitmapSampler& operator=(const SkBitmapSampler&); | |
| 58 }; | |
| 59 | |
| 60 static inline int fixed_clamp(SkFixed x) | |
| 61 { | |
| 62 #ifdef SK_CPU_HAS_CONDITIONAL_INSTR | |
| 63 if (x >> 16) | |
| 64 x = 0xFFFF; | |
| 65 if (x < 0) | |
| 66 x = 0; | |
| 67 #else | |
| 68 if (x >> 16) | |
| 69 { | |
| 70 if (x < 0) | |
| 71 x = 0; | |
| 72 else | |
| 73 x = 0xFFFF; | |
| 74 } | |
| 75 #endif | |
| 76 return x; | |
| 77 } | |
| 78 | |
| 79 ////////////////////////////////////////////////////////////////////////////////
////// | |
| 80 | |
| 81 static inline int fixed_repeat(SkFixed x) | |
| 82 { | |
| 83 return x & 0xFFFF; | |
| 84 } | |
| 85 | |
| 86 static inline int fixed_mirror(SkFixed x) | |
| 87 { | |
| 88 SkFixed s = x << 15 >> 31; | |
| 89 // s is FFFFFFFF if we're on an odd interval, or 0 if an even interval | |
| 90 return (x ^ s) & 0xFFFF; | |
| 91 } | |
| 92 | |
| 93 static inline bool is_pow2(int count) | |
| 94 { | |
| 95 SkASSERT(count > 0); | |
| 96 return (count & (count - 1)) == 0; | |
| 97 } | |
| 98 | |
| 99 static inline int do_clamp(int index, unsigned max) | |
| 100 { | |
| 101 SkASSERT((int)max >= 0); | |
| 102 | |
| 103 #ifdef SK_CPU_HAS_CONDITIONAL_INSTR | |
| 104 if (index > (int)max) | |
| 105 index = max; | |
| 106 if (index < 0) | |
| 107 index = 0; | |
| 108 #else | |
| 109 if ((unsigned)index > max) | |
| 110 { | |
| 111 if (index < 0) | |
| 112 index = 0; | |
| 113 else | |
| 114 index = max; | |
| 115 } | |
| 116 #endif | |
| 117 return index; | |
| 118 } | |
| 119 | |
| 120 static inline int do_repeat_mod(int index, unsigned max) | |
| 121 { | |
| 122 SkASSERT((int)max >= 0); | |
| 123 | |
| 124 if ((unsigned)index > max) | |
| 125 { | |
| 126 if (index < 0) | |
| 127 index = max - (~index % (max + 1)); | |
| 128 else | |
| 129 index = index % (max + 1); | |
| 130 } | |
| 131 return index; | |
| 132 } | |
| 133 | |
| 134 static inline int do_repeat_pow2(int index, unsigned max) | |
| 135 { | |
| 136 SkASSERT((int)max >= 0 && is_pow2(max + 1)); | |
| 137 | |
| 138 return index & max; | |
| 139 } | |
| 140 | |
| 141 static inline int do_mirror_mod(int index, unsigned max) | |
| 142 { | |
| 143 SkASSERT((int)max >= 0); | |
| 144 | |
| 145 // have to handle negatives so that | |
| 146 // -1 -> 0, -2 -> 1, -3 -> 2, etc. | |
| 147 // so we can't just cal abs | |
| 148 index ^= index >> 31; | |
| 149 | |
| 150 if ((unsigned)index > max) | |
| 151 { | |
| 152 int mod = (max + 1) << 1; | |
| 153 index = index % mod; | |
| 154 if ((unsigned)index > max) | |
| 155 index = mod - index - 1; | |
| 156 } | |
| 157 return index; | |
| 158 } | |
| 159 | |
| 160 static inline int do_mirror_pow2(int index, unsigned max) | |
| 161 { | |
| 162 SkASSERT((int)max >= 0 && is_pow2(max + 1)); | |
| 163 | |
| 164 int s = (index & (max + 1)) - 1; | |
| 165 s = ~(s >> 31); | |
| 166 // at this stage, s is FFFFFFFF if we're on an odd interval, or 0 if an even
interval | |
| 167 return (index ^ s) & max; | |
| 168 } | |
| 169 | |
| 170 #endif | |
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Chromium Code Reviews
Issue 113827:
Remove the remainder of the skia source code from the Chromium repo.... (Closed)
Base URL: svn://chrome-svn/chrome/trunk/src/