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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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129 /** The type of the mask pre-blend which will be returned from preBlend(SkCo
lor). */ | 129 /** The type of the mask pre-blend which will be returned from preBlend(SkCo
lor). */ |
130 typedef SkTMaskPreBlend<R_LUM_BITS, G_LUM_BITS, B_LUM_BITS> PreBlend; | 130 typedef SkTMaskPreBlend<R_LUM_BITS, G_LUM_BITS, B_LUM_BITS> PreBlend; |
131 | 131 |
132 /** | 132 /** |
133 * Provides access to the tables appropriate for converting linear alpha | 133 * Provides access to the tables appropriate for converting linear alpha |
134 * values into gamma correcting alpha values when drawing the given color | 134 * values into gamma correcting alpha values when drawing the given color |
135 * through the mask. The destination color will be approximated. | 135 * through the mask. The destination color will be approximated. |
136 */ | 136 */ |
137 PreBlend preBlend(SkColor color) const; | 137 PreBlend preBlend(SkColor color) const; |
138 | 138 |
139 /** | |
140 * Get dimensions for the full table set, so it can be allocated as a block. | |
141 */ | |
142 void getGammaTableDimensions(int* tableWidth, int* numTables) const { | |
143 *tableWidth = 256; | |
144 *numTables = (1 << MAX_LUM_BITS); | |
145 } | |
146 | |
147 /** | |
148 * Provides direct access to the full table set, so it can be uploaded | |
149 * into a texture. | |
150 */ | |
151 const uint8_t* getGammaTables() const { | |
152 return (const uint8_t*) fGammaTables; | |
153 } | |
154 | |
155 private: | 139 private: |
156 static const int MAX_LUM_BITS = | 140 static const int MAX_LUM_BITS = |
157 B_LUM_BITS > (R_LUM_BITS > G_LUM_BITS ? R_LUM_BITS : G_LUM_BITS) | 141 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); | 142 ? B_LUM_BITS : (R_LUM_BITS > G_LUM_BITS ? R_LUM_BITS : G_LUM_BITS); |
159 uint8_t fGammaTables[1 << MAX_LUM_BITS][256]; | 143 uint8_t fGammaTables[1 << MAX_LUM_BITS][256]; |
160 bool fIsLinear; | 144 bool fIsLinear; |
161 | 145 |
162 typedef SkRefCnt INHERITED; | 146 typedef SkRefCnt INHERITED; |
163 }; | 147 }; |
164 | 148 |
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223 */ | 207 */ |
224 template<bool APPLY_LUT> static inline U8CPU sk_apply_lut_if(U8CPU component, co
nst uint8_t*) { | 208 template<bool APPLY_LUT> static inline U8CPU sk_apply_lut_if(U8CPU component, co
nst uint8_t*) { |
225 return component; | 209 return component; |
226 } | 210 } |
227 template<> /*static*/ inline U8CPU sk_apply_lut_if<true>(U8CPU component, const
uint8_t* lut) { | 211 template<> /*static*/ inline U8CPU sk_apply_lut_if<true>(U8CPU component, const
uint8_t* lut) { |
228 return lut[component]; | 212 return lut[component]; |
229 } | 213 } |
230 ///@} | 214 ///@} |
231 | 215 |
232 #endif | 216 #endif |
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