1 #include "SkConfig8888.h" 2 #include "SkMathPriv.h" 3 #include "SkUnPreMultiply.h" 4 5 namespace { 6 7 template <int A_IDX, int R_IDX, int G_IDX, int B_IDX> 8 inline uint32_t pack_config8888(uint32_t a, uint32_t r, 9 uint32_t g, uint32_t b) { 10 #ifdef SK_CPU_LENDIAN 11 return (a << (A_IDX * 8)) | (r << (R_IDX * 8)) | 12 (g << (G_IDX * 8)) | (b << (B_IDX * 8)); 13 #else 14 return (a << ((3-A_IDX) * 8)) | (r << ((3-R_IDX) * 8)) | 15 (g << ((3-G_IDX) * 8)) | (b << ((3-B_IDX) * 8)); 16 #endif 17 } 18 19 template <int A_IDX, int R_IDX, int G_IDX, int B_IDX> 20 inline void unpack_config8888(uint32_t color, 21 uint32_t* a, uint32_t* r, 22 uint32_t* g, uint32_t* b) { 23 #ifdef SK_CPU_LENDIAN 24 *a = (color >> (A_IDX * 8)) & 0xff; 25 *r = (color >> (R_IDX * 8)) & 0xff; 26 *g = (color >> (G_IDX * 8)) & 0xff; 27 *b = (color >> (B_IDX * 8)) & 0xff; 28 #else 29 *a = (color >> ((3 - A_IDX) * 8)) & 0xff; 30 *r = (color >> ((3 - R_IDX) * 8)) & 0xff; 31 *g = (color >> ((3 - G_IDX) * 8)) & 0xff; 32 *b = (color >> ((3 - B_IDX) * 8)) & 0xff; 33 #endif 34 } 35 36 #ifdef SK_CPU_LENDIAN 37 static const int SK_NATIVE_A_IDX = SK_A32_SHIFT / 8; 38 static const int SK_NATIVE_R_IDX = SK_R32_SHIFT / 8; 39 static const int SK_NATIVE_G_IDX = SK_G32_SHIFT / 8; 40 static const int SK_NATIVE_B_IDX = SK_B32_SHIFT / 8; 41 #else 42 static const int SK_NATIVE_A_IDX = 3 - (SK_A32_SHIFT / 8); 43 static const int SK_NATIVE_R_IDX = 3 - (SK_R32_SHIFT / 8); 44 static const int SK_NATIVE_G_IDX = 3 - (SK_G32_SHIFT / 8); 45 static const int SK_NATIVE_B_IDX = 3 - (SK_B32_SHIFT / 8); 46 #endif 47 48 /** 49 * convert_pixel<OUT_CFG, IN_CFG converts a pixel value from one Config8888 to 50 * another. It is implemented by first expanding OUT_CFG to r, g, b, a indices 51 * and an is_premul bool as params to another template function. Then IN_CFG is 52 * expanded via another function call. 53 */ 54 55 template <bool OUT_PM, int OUT_A_IDX, int OUT_R_IDX, int OUT_G_IDX, int OUT_B_IDX, 56 bool IN_PM, int IN_A_IDX, int IN_R_IDX, int IN_G_IDX, int IN_B_IDX> 57 inline uint32_t convert_pixel(uint32_t pixel) { 58 uint32_t a, r, g, b; 59 unpack_config8888<IN_A_IDX, IN_R_IDX, IN_G_IDX, IN_B_IDX>(pixel, &a, &r, &g, &b); 60 if (IN_PM && !OUT_PM) { 61 // Using SkUnPreMultiply::ApplyScale is faster than (value * 0xff) / a. 62 if (a) { 63 SkUnPreMultiply::Scale scale = SkUnPreMultiply::GetScale(a); 64 r = SkUnPreMultiply::ApplyScale(scale, r); 65 g = SkUnPreMultiply::ApplyScale(scale, g); 66 b = SkUnPreMultiply::ApplyScale(scale, b); 67 } else { 68 return 0; 69 } 70 } else if (!IN_PM && OUT_PM) { 71 // This matches SkUnPreMultiply conversion which we are replacing. 72 r = SkMulDiv255Round(r, a); 73 g = SkMulDiv255Round(g, a); 74 b = SkMulDiv255Round(b, a); 75 } 76 return pack_config8888<OUT_A_IDX, OUT_R_IDX, OUT_G_IDX, OUT_B_IDX>(a, r, g, b); 77 } 78 79 template <bool OUT_PM, int OUT_A_IDX, int OUT_R_IDX, int OUT_G_IDX, int OUT_B_IDX, SkCanvas::Config8888 IN_CFG> 80 inline uint32_t convert_pixel(uint32_t pixel) { 81 switch(IN_CFG) { 82 case SkCanvas::kNative_Premul_Config8888: 83 return convert_pixel<OUT_PM, OUT_A_IDX, OUT_R_IDX, OUT_G_IDX, OUT_B_IDX, 84 true, SK_NATIVE_A_IDX, SK_NATIVE_R_IDX, SK_NATIVE_G_IDX, SK_NATIVE_B_IDX>(pixel); 85 break; 86 case SkCanvas::kNative_Unpremul_Config8888: 87 return convert_pixel<OUT_PM, OUT_A_IDX, OUT_R_IDX, OUT_G_IDX, OUT_B_IDX, 88 false, SK_NATIVE_A_IDX, SK_NATIVE_R_IDX, SK_NATIVE_G_IDX, SK_NATIVE_B_IDX>(pixel); 89 break; 90 case SkCanvas::kBGRA_Premul_Config8888: 91 return convert_pixel<OUT_PM, OUT_A_IDX, OUT_R_IDX, OUT_G_IDX, OUT_B_IDX, 92 true, 3, 2, 1, 0>(pixel); 93 break; 94 case SkCanvas::kBGRA_Unpremul_Config8888: 95 return convert_pixel<OUT_PM, OUT_A_IDX, OUT_R_IDX, OUT_G_IDX, OUT_B_IDX, 96 false, 3, 2, 1, 0>(pixel); 97 break; 98 case SkCanvas::kRGBA_Premul_Config8888: 99 return convert_pixel<OUT_PM, OUT_A_IDX, OUT_R_IDX, OUT_G_IDX, OUT_B_IDX, 100 true, 3, 0, 1, 2>(pixel); 101 break; 102 case SkCanvas::kRGBA_Unpremul_Config8888: 103 return convert_pixel<OUT_PM, OUT_A_IDX, OUT_R_IDX, OUT_G_IDX, OUT_B_IDX, 104 false, 3, 0, 1, 2>(pixel); 105 break; 106 default: 107 SkDEBUGFAIL("Unexpected config8888"); 108 return 0; 109 break; 110 } 111 } 112 113 template <SkCanvas::Config8888 OUT_CFG, SkCanvas::Config8888 IN_CFG> 114 inline uint32_t convert_pixel(uint32_t pixel) { 115 switch(OUT_CFG) { 116 case SkCanvas::kNative_Premul_Config8888: 117 return convert_pixel<true, SK_NATIVE_A_IDX, SK_NATIVE_R_IDX, SK_NATIVE_G_IDX, SK_NATIVE_B_IDX, IN_CFG>(pixel); 118 break; 119 case SkCanvas::kNative_Unpremul_Config8888: 120 return convert_pixel<false, SK_NATIVE_A_IDX, SK_NATIVE_R_IDX, SK_NATIVE_G_IDX, SK_NATIVE_B_IDX, IN_CFG>(pixel); 121 break; 122 case SkCanvas::kBGRA_Premul_Config8888: 123 return convert_pixel<true, 3, 2, 1, 0, IN_CFG>(pixel); 124 break; 125 case SkCanvas::kBGRA_Unpremul_Config8888: 126 return convert_pixel<false, 3, 2, 1, 0, IN_CFG>(pixel); 127 break; 128 case SkCanvas::kRGBA_Premul_Config8888: 129 return convert_pixel<true, 3, 0, 1, 2, IN_CFG>(pixel); 130 break; 131 case SkCanvas::kRGBA_Unpremul_Config8888: 132 return convert_pixel<false, 3, 0, 1, 2, IN_CFG>(pixel); 133 break; 134 default: 135 SkDEBUGFAIL("Unexpected config8888"); 136 return 0; 137 break; 138 } 139 } 140 141 /** 142 * SkConvertConfig8888Pixels has 6 * 6 possible combinations of src and dst 143 * configs. Each is implemented as an instantiation templated function. Two 144 * levels of switch statements are used to select the correct instantiation, one 145 * for the src config and one for the dst config. 146 */ 147 148 template <SkCanvas::Config8888 DST_CFG, SkCanvas::Config8888 SRC_CFG> 149 inline void convert_config8888(uint32_t* dstPixels, 150 size_t dstRowBytes, 151 const uint32_t* srcPixels, 152 size_t srcRowBytes, 153 int width, 154 int height) { 155 intptr_t dstPix = reinterpret_cast<intptr_t>(dstPixels); 156 intptr_t srcPix = reinterpret_cast<intptr_t>(srcPixels); 157 158 for (int y = 0; y < height; ++y) { 159 srcPixels = reinterpret_cast<const uint32_t*>(srcPix); 160 dstPixels = reinterpret_cast<uint32_t*>(dstPix); 161 for (int x = 0; x < width; ++x) { 162 dstPixels[x] = convert_pixel<DST_CFG, SRC_CFG>(srcPixels[x]); 163 } 164 dstPix += dstRowBytes; 165 srcPix += srcRowBytes; 166 } 167 } 168 169 template <SkCanvas::Config8888 SRC_CFG> 170 inline void convert_config8888(uint32_t* dstPixels, 171 size_t dstRowBytes, 172 SkCanvas::Config8888 dstConfig, 173 const uint32_t* srcPixels, 174 size_t srcRowBytes, 175 int width, 176 int height) { 177 switch(dstConfig) { 178 case SkCanvas::kNative_Premul_Config8888: 179 convert_config8888<SkCanvas::kNative_Premul_Config8888, SRC_CFG>(dstPixels, dstRowBytes, srcPixels, srcRowBytes, width, height); 180 break; 181 case SkCanvas::kNative_Unpremul_Config8888: 182 convert_config8888<SkCanvas::kNative_Unpremul_Config8888, SRC_CFG>(dstPixels, dstRowBytes, srcPixels, srcRowBytes, width, height); 183 break; 184 case SkCanvas::kBGRA_Premul_Config8888: 185 convert_config8888<SkCanvas::kBGRA_Premul_Config8888, SRC_CFG>(dstPixels, dstRowBytes, srcPixels, srcRowBytes, width, height); 186 break; 187 case SkCanvas::kBGRA_Unpremul_Config8888: 188 convert_config8888<SkCanvas::kBGRA_Unpremul_Config8888, SRC_CFG>(dstPixels, dstRowBytes, srcPixels, srcRowBytes, width, height); 189 break; 190 case SkCanvas::kRGBA_Premul_Config8888: 191 convert_config8888<SkCanvas::kRGBA_Premul_Config8888, SRC_CFG>(dstPixels, dstRowBytes, srcPixels, srcRowBytes, width, height); 192 break; 193 case SkCanvas::kRGBA_Unpremul_Config8888: 194 convert_config8888<SkCanvas::kRGBA_Unpremul_Config8888, SRC_CFG>(dstPixels, dstRowBytes, srcPixels, srcRowBytes, width, height); 195 break; 196 default: 197 SkDEBUGFAIL("Unexpected config8888"); 198 break; 199 } 200 } 201 202 } 203 204 void SkConvertConfig8888Pixels(uint32_t* dstPixels, 205 size_t dstRowBytes, 206 SkCanvas::Config8888 dstConfig, 207 const uint32_t* srcPixels, 208 size_t srcRowBytes, 209 SkCanvas::Config8888 srcConfig, 210 int width, 211 int height) { 212 if (srcConfig == dstConfig) { 213 if (srcPixels == dstPixels) { 214 return; 215 } 216 if (dstRowBytes == srcRowBytes && 217 4U * width == srcRowBytes) { 218 memcpy(dstPixels, srcPixels, srcRowBytes * height); 219 return; 220 } else { 221 intptr_t srcPix = reinterpret_cast<intptr_t>(srcPixels); 222 intptr_t dstPix = reinterpret_cast<intptr_t>(dstPixels); 223 for (int y = 0; y < height; ++y) { 224 srcPixels = reinterpret_cast<const uint32_t*>(srcPix); 225 dstPixels = reinterpret_cast<uint32_t*>(dstPix); 226 memcpy(dstPixels, srcPixels, 4 * width); 227 srcPix += srcRowBytes; 228 dstPix += dstRowBytes; 229 } 230 return; 231 } 232 } 233 switch(srcConfig) { 234 case SkCanvas::kNative_Premul_Config8888: 235 convert_config8888<SkCanvas::kNative_Premul_Config8888>(dstPixels, dstRowBytes, dstConfig, srcPixels, srcRowBytes, width, height); 236 break; 237 case SkCanvas::kNative_Unpremul_Config8888: 238 convert_config8888<SkCanvas::kNative_Unpremul_Config8888>(dstPixels, dstRowBytes, dstConfig, srcPixels, srcRowBytes, width, height); 239 break; 240 case SkCanvas::kBGRA_Premul_Config8888: 241 convert_config8888<SkCanvas::kBGRA_Premul_Config8888>(dstPixels, dstRowBytes, dstConfig, srcPixels, srcRowBytes, width, height); 242 break; 243 case SkCanvas::kBGRA_Unpremul_Config8888: 244 convert_config8888<SkCanvas::kBGRA_Unpremul_Config8888>(dstPixels, dstRowBytes, dstConfig, srcPixels, srcRowBytes, width, height); 245 break; 246 case SkCanvas::kRGBA_Premul_Config8888: 247 convert_config8888<SkCanvas::kRGBA_Premul_Config8888>(dstPixels, dstRowBytes, dstConfig, srcPixels, srcRowBytes, width, height); 248 break; 249 case SkCanvas::kRGBA_Unpremul_Config8888: 250 convert_config8888<SkCanvas::kRGBA_Unpremul_Config8888>(dstPixels, dstRowBytes, dstConfig, srcPixels, srcRowBytes, width, height); 251 break; 252 default: 253 SkDEBUGFAIL("Unexpected config8888"); 254 break; 255 } 256 } 257 258 uint32_t SkPackConfig8888(SkCanvas::Config8888 config, 259 uint32_t a, 260 uint32_t r, 261 uint32_t g, 262 uint32_t b) { 263 switch (config) { 264 case SkCanvas::kNative_Premul_Config8888: 265 case SkCanvas::kNative_Unpremul_Config8888: 266 return pack_config8888<SK_NATIVE_A_IDX, 267 SK_NATIVE_R_IDX, 268 SK_NATIVE_G_IDX, 269 SK_NATIVE_B_IDX>(a, r, g, b); 270 case SkCanvas::kBGRA_Premul_Config8888: 271 case SkCanvas::kBGRA_Unpremul_Config8888: 272 return pack_config8888<3, 2, 1, 0>(a, r, g, b); 273 case SkCanvas::kRGBA_Premul_Config8888: 274 case SkCanvas::kRGBA_Unpremul_Config8888: 275 return pack_config8888<3, 0, 1, 2>(a, r, g, b); 276 default: 277 SkDEBUGFAIL("Unexpected config8888"); 278 return 0; 279 } 280 } 281
