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| 1 /* | 1 /* |
| 2 * Copyright 2012 Google Inc. | 2 * Copyright 2012 Google Inc. |
| 3 * | 3 * |
| 4 * Use of this source code is governed by a BSD-style license that can be | 4 * Use of this source code is governed by a BSD-style license that can be |
| 5 * found in the LICENSE file. | 5 * found in the LICENSE file. |
| 6 */ | 6 */ |
| 7 | 7 |
| 8 #ifndef SkMaskGamma_DEFINED | 8 #ifndef SkMaskGamma_DEFINED |
| 9 #define SkMaskGamma_DEFINED | 9 #define SkMaskGamma_DEFINED |
| 10 | 10 |
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| 85 * contains non-linear alpha values in an attempt to create gamma correct blits | 85 * contains non-linear alpha values in an attempt to create gamma correct blits |
| 86 * in the presence of a gamma incorrect (linear) blend in the blitter. | 86 * in the presence of a gamma incorrect (linear) blend in the blitter. |
| 87 * | 87 * |
| 88 * SkMaskGamma creates and maintains tables which convert linear alpha values | 88 * SkMaskGamma creates and maintains tables which convert linear alpha values |
| 89 * to gamma correcting alpha values. | 89 * to gamma correcting alpha values. |
| 90 * @param R The number of luminance bits to use [1, 8] from the red channel. | 90 * @param R The number of luminance bits to use [1, 8] from the red channel. |
| 91 * @param G The number of luminance bits to use [1, 8] from the green channel. | 91 * @param G The number of luminance bits to use [1, 8] from the green channel. |
| 92 * @param B The number of luminance bits to use [1, 8] from the blue channel. | 92 * @param B The number of luminance bits to use [1, 8] from the blue channel. |
| 93 */ | 93 */ |
| 94 template <int R_LUM_BITS, int G_LUM_BITS, int B_LUM_BITS> class SkTMaskGamma : p
ublic SkRefCnt { | 94 template <int R_LUM_BITS, int G_LUM_BITS, int B_LUM_BITS> class SkTMaskGamma : p
ublic SkRefCnt { |
| 95 | 95 |
| 96 public: | 96 public: |
| 97 | 97 |
| 98 /** Creates a linear SkTMaskGamma. */ | 98 /** Creates a linear SkTMaskGamma. */ |
| 99 SkTMaskGamma() : fIsLinear(true) { } | 99 SkTMaskGamma() : fIsLinear(true) { } |
| 100 | 100 |
| 101 /** | 101 /** |
| 102 * Creates tables to convert linear alpha values to gamma correcting alpha | 102 * Creates tables to convert linear alpha values to gamma correcting alpha |
| 103 * values. | 103 * values. |
| 104 * | 104 * |
| 105 * @param contrast A value in the range [0.0, 1.0] which indicates the | 105 * @param contrast A value in the range [0.0, 1.0] which indicates the |
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| 144 *numTables = (1 << MAX_LUM_BITS); | 144 *numTables = (1 << MAX_LUM_BITS); |
| 145 } | 145 } |
| 146 | 146 |
| 147 /** | 147 /** |
| 148 * Provides direct access to the full table set, so it can be uploaded | 148 * Provides direct access to the full table set, so it can be uploaded |
| 149 * into a texture. | 149 * into a texture. |
| 150 */ | 150 */ |
| 151 const uint8_t* getGammaTables() const { | 151 const uint8_t* getGammaTables() const { |
| 152 return (const uint8_t*) fGammaTables; | 152 return (const uint8_t*) fGammaTables; |
| 153 } | 153 } |
| 154 | 154 |
| 155 private: | 155 private: |
| 156 static const int MAX_LUM_BITS = | 156 static const int MAX_LUM_BITS = |
| 157 B_LUM_BITS > (R_LUM_BITS > G_LUM_BITS ? R_LUM_BITS : G_LUM_BITS) | 157 B_LUM_BITS > (R_LUM_BITS > G_LUM_BITS ? R_LUM_BITS : G_LUM_BITS) |
| 158 ? B_LUM_BITS : (R_LUM_BITS > G_LUM_BITS ? R_LUM_BITS : G_LUM_BITS); | 158 ? B_LUM_BITS : (R_LUM_BITS > G_LUM_BITS ? R_LUM_BITS : G_LUM_BITS); |
| 159 uint8_t fGammaTables[1 << MAX_LUM_BITS][256]; | 159 uint8_t fGammaTables[1 << MAX_LUM_BITS][256]; |
| 160 bool fIsLinear; | 160 bool fIsLinear; |
| 161 | 161 |
| 162 typedef SkRefCnt INHERITED; | 162 typedef SkRefCnt INHERITED; |
| 163 }; | 163 }; |
| 164 | 164 |
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| 221 */ | 221 */ |
| 222 template<bool APPLY_LUT> static inline U8CPU sk_apply_lut_if(U8CPU component, co
nst uint8_t*) { | 222 template<bool APPLY_LUT> static inline U8CPU sk_apply_lut_if(U8CPU component, co
nst uint8_t*) { |
| 223 return component; | 223 return component; |
| 224 } | 224 } |
| 225 template<> /*static*/ inline U8CPU sk_apply_lut_if<true>(U8CPU component, const
uint8_t* lut) { | 225 template<> /*static*/ inline U8CPU sk_apply_lut_if<true>(U8CPU component, const
uint8_t* lut) { |
| 226 return lut[component]; | 226 return lut[component]; |
| 227 } | 227 } |
| 228 ///@} | 228 ///@} |
| 229 | 229 |
| 230 #endif | 230 #endif |
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