1 /* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef HW_EMULATOR_CAMERA_CONVERTERS_H 18 #define HW_EMULATOR_CAMERA_CONVERTERS_H 19 20 #include <endian.h> 21 22 #ifndef __BYTE_ORDER 23 #error "could not determine byte order" 24 #endif 25 26 /* 27 * Contains declaration of framebuffer conversion routines. 28 * 29 * NOTE: RGB and big/little endian considerations. Wherewer in this code RGB 30 * pixels are represented as WORD, or DWORD, the color order inside the 31 * WORD / DWORD matches the one that would occur if that WORD / DWORD would have 32 * been read from the typecasted framebuffer: 33 * 34 * const uint32_t rgb = *reinterpret_cast<const uint32_t*>(framebuffer); 35 * 36 * So, if this code runs on the little endian CPU, red color in 'rgb' would be 37 * masked as 0x000000ff, and blue color would be masked as 0x00ff0000, while if 38 * the code runs on a big endian CPU, the red color in 'rgb' would be masked as 39 * 0xff000000, and blue color would be masked as 0x0000ff00, 40 */ 41 42 namespace android { 43 44 /* 45 * RGB565 color masks 46 */ 47 48 #if __BYTE_ORDER == __LITTLE_ENDIAN 49 static const uint16_t kRed5 = 0x001f; 50 static const uint16_t kGreen6 = 0x07e0; 51 static const uint16_t kBlue5 = 0xf800; 52 #else // __BYTE_ORDER 53 static const uint16_t kRed5 = 0xf800; 54 static const uint16_t kGreen6 = 0x07e0; 55 static const uint16_t kBlue5 = 0x001f; 56 #endif // __BYTE_ORDER 57 static const uint32_t kBlack16 = 0x0000; 58 static const uint32_t kWhite16 = kRed5 | kGreen6 | kBlue5; 59 60 /* 61 * RGB32 color masks 62 */ 63 64 #if __BYTE_ORDER == __LITTLE_ENDIAN 65 static const uint32_t kRed8 = 0x000000ff; 66 static const uint32_t kGreen8 = 0x0000ff00; 67 static const uint32_t kBlue8 = 0x00ff0000; 68 #else // __BYTE_ORDER 69 static const uint32_t kRed8 = 0x00ff0000; 70 static const uint32_t kGreen8 = 0x0000ff00; 71 static const uint32_t kBlue8 = 0x000000ff; 72 #endif // __BYTE_ORDER 73 static const uint32_t kBlack32 = 0x00000000; 74 static const uint32_t kWhite32 = kRed8 | kGreen8 | kBlue8; 75 76 /* 77 * Extracting, and saving color bytes from / to WORD / DWORD RGB. 78 */ 79 80 #if __BYTE_ORDER == __LITTLE_ENDIAN 81 /* Extract red, green, and blue bytes from RGB565 word. */ 82 #define R16(rgb) static_cast<uint8_t>(rgb & kRed5) 83 #define G16(rgb) static_cast<uint8_t>((rgb & kGreen6) >> 5) 84 #define B16(rgb) static_cast<uint8_t>((rgb & kBlue5) >> 11) 85 /* Make 8 bits red, green, and blue, extracted from RGB565 word. */ 86 #define R16_32(rgb) static_cast<uint8_t>(((rgb & kRed5) << 3) | ((rgb & kRed5) >> 2)) 87 #define G16_32(rgb) static_cast<uint8_t>(((rgb & kGreen6) >> 3) | ((rgb & kGreen6) >> 9)) 88 #define B16_32(rgb) static_cast<uint8_t>(((rgb & kBlue5) >> 8) | ((rgb & kBlue5) >> 14)) 89 /* Extract red, green, and blue bytes from RGB32 dword. */ 90 #define R32(rgb) static_cast<uint8_t>(rgb & kRed8) 91 #define G32(rgb) static_cast<uint8_t>(((rgb & kGreen8) >> 8) & 0xff) 92 #define B32(rgb) static_cast<uint8_t>(((rgb & kBlue8) >> 16) & 0xff) 93 /* Build RGB565 word from red, green, and blue bytes. */ 94 #define RGB565(r, g, b) static_cast<uint16_t>((((static_cast<uint16_t>(b) << 6) | g) << 5) | r) 95 /* Build RGB32 dword from red, green, and blue bytes. */ 96 #define RGB32(r, g, b) static_cast<uint32_t>((((static_cast<uint32_t>(b) << 8) | g) << 8) | r) 97 #else // __BYTE_ORDER 98 /* Extract red, green, and blue bytes from RGB565 word. */ 99 #define R16(rgb) static_cast<uint8_t>((rgb & kRed5) >> 11) 100 #define G16(rgb) static_cast<uint8_t>((rgb & kGreen6) >> 5) 101 #define B16(rgb) static_cast<uint8_t>(rgb & kBlue5) 102 /* Make 8 bits red, green, and blue, extracted from RGB565 word. */ 103 #define R16_32(rgb) static_cast<uint8_t>(((rgb & kRed5) >> 8) | ((rgb & kRed5) >> 14)) 104 #define G16_32(rgb) static_cast<uint8_t>(((rgb & kGreen6) >> 3) | ((rgb & kGreen6) >> 9)) 105 #define B16_32(rgb) static_cast<uint8_t>(((rgb & kBlue5) << 3) | ((rgb & kBlue5) >> 2)) 106 /* Extract red, green, and blue bytes from RGB32 dword. */ 107 #define R32(rgb) static_cast<uint8_t>((rgb & kRed8) >> 16) 108 #define G32(rgb) static_cast<uint8_t>((rgb & kGreen8) >> 8) 109 #define B32(rgb) static_cast<uint8_t>(rgb & kBlue8) 110 /* Build RGB565 word from red, green, and blue bytes. */ 111 #define RGB565(r, g, b) static_cast<uint16_t>((((static_cast<uint16_t>(r) << 6) | g) << 5) | b) 112 /* Build RGB32 dword from red, green, and blue bytes. */ 113 #define RGB32(r, g, b) static_cast<uint32_t>((((static_cast<uint32_t>(r) << 8) | g) << 8) | b) 114 #endif // __BYTE_ORDER 115 116 /* An union that simplifies breaking 32 bit RGB into separate R, G, and B colors. 117 */ 118 typedef union RGB32_t { 119 uint32_t color; 120 struct { 121 #if __BYTE_ORDER == __LITTLE_ENDIAN 122 uint8_t r; uint8_t g; uint8_t b; uint8_t a; 123 #else // __BYTE_ORDER 124 uint8_t a; uint8_t b; uint8_t g; uint8_t r; 125 #endif // __BYTE_ORDER 126 }; 127 } RGB32_t; 128 129 130 /* Clips a value to the unsigned 0-255 range, treating negative values as zero. 131 */ 132 static __inline__ int 133 clamp(int x) 134 { 135 if (x > 255) return 255; 136 if (x < 0) return 0; 137 return x; 138 } 139 140 /******************************************************************************** 141 * Basics of RGB -> YUV conversion 142 *******************************************************************************/ 143 144 /* 145 * RGB -> YUV conversion macros 146 */ 147 #define RGB2Y(r, g, b) (uint8_t)(((66 * (r) + 129 * (g) + 25 * (b) + 128) >> 8) + 16) 148 #define RGB2U(r, g, b) (uint8_t)(((-38 * (r) - 74 * (g) + 112 * (b) + 128) >> 8) + 128) 149 #define RGB2V(r, g, b) (uint8_t)(((112 * (r) - 94 * (g) - 18 * (b) + 128) >> 8) + 128) 150 151 /* Converts R8 G8 B8 color to YUV. */ 152 static __inline__ void 153 R8G8B8ToYUV(uint8_t r, uint8_t g, uint8_t b, uint8_t* y, uint8_t* u, uint8_t* v) 154 { 155 *y = RGB2Y((int)r, (int)g, (int)b); 156 *u = RGB2U((int)r, (int)g, (int)b); 157 *v = RGB2V((int)r, (int)g, (int)b); 158 } 159 160 /* Converts RGB565 color to YUV. */ 161 static __inline__ void 162 RGB565ToYUV(uint16_t rgb, uint8_t* y, uint8_t* u, uint8_t* v) 163 { 164 R8G8B8ToYUV(R16_32(rgb), G16_32(rgb), B16_32(rgb), y, u, v); 165 } 166 167 /* Converts RGB32 color to YUV. */ 168 static __inline__ void 169 RGB32ToYUV(uint32_t rgb, uint8_t* y, uint8_t* u, uint8_t* v) 170 { 171 RGB32_t rgb_c; 172 rgb_c.color = rgb; 173 R8G8B8ToYUV(rgb_c.r, rgb_c.g, rgb_c.b, y, u, v); 174 } 175 176 /******************************************************************************** 177 * Basics of YUV -> RGB conversion. 178 * Note that due to the fact that guest uses RGB only on preview window, and the 179 * RGB format that is used is RGB565, we can limit YUV -> RGB conversions to 180 * RGB565 only. 181 *******************************************************************************/ 182 183 /* 184 * YUV -> RGB conversion macros 185 */ 186 187 /* "Optimized" macros that take specialy prepared Y, U, and V values: 188 * C = Y - 16 189 * D = U - 128 190 * E = V - 128 191 */ 192 #define YUV2RO(C, D, E) clamp((298 * (C) + 409 * (E) + 128) >> 8) 193 #define YUV2GO(C, D, E) clamp((298 * (C) - 100 * (D) - 208 * (E) + 128) >> 8) 194 #define YUV2BO(C, D, E) clamp((298 * (C) + 516 * (D) + 128) >> 8) 195 196 /* 197 * Main macros that take the original Y, U, and V values 198 */ 199 #define YUV2R(y, u, v) clamp((298 * ((y)-16) + 409 * ((v)-128) + 128) >> 8) 200 #define YUV2G(y, u, v) clamp((298 * ((y)-16) - 100 * ((u)-128) - 208 * ((v)-128) + 128) >> 8) 201 #define YUV2B(y, u, v) clamp((298 * ((y)-16) + 516 * ((u)-128) + 128) >> 8) 202 203 204 /* Converts YUV color to RGB565. */ 205 static __inline__ uint16_t 206 YUVToRGB565(int y, int u, int v) 207 { 208 /* Calculate C, D, and E values for the optimized macro. */ 209 y -= 16; u -= 128; v -= 128; 210 const uint16_t r = (YUV2RO(y,u,v) >> 3) & 0x1f; 211 const uint16_t g = (YUV2GO(y,u,v) >> 2) & 0x3f; 212 const uint16_t b = (YUV2BO(y,u,v) >> 3) & 0x1f; 213 return RGB565(r, g, b); 214 } 215 216 /* Converts YUV color to RGB32. */ 217 static __inline__ uint32_t 218 YUVToRGB32(int y, int u, int v) 219 { 220 /* Calculate C, D, and E values for the optimized macro. */ 221 y -= 16; u -= 128; v -= 128; 222 RGB32_t rgb; 223 rgb.r = YUV2RO(y,u,v) & 0xff; 224 rgb.g = YUV2GO(y,u,v) & 0xff; 225 rgb.b = YUV2BO(y,u,v) & 0xff; 226 return rgb.color; 227 } 228 229 /* YUV pixel descriptor. */ 230 struct YUVPixel { 231 uint8_t Y; 232 uint8_t U; 233 uint8_t V; 234 235 inline YUVPixel() 236 : Y(0), U(0), V(0) 237 { 238 } 239 240 inline explicit YUVPixel(uint16_t rgb565) 241 { 242 RGB565ToYUV(rgb565, &Y, &U, &V); 243 } 244 245 inline explicit YUVPixel(uint32_t rgb32) 246 { 247 RGB32ToYUV(rgb32, &Y, &U, &V); 248 } 249 250 inline void get(uint8_t* pY, uint8_t* pU, uint8_t* pV) const 251 { 252 *pY = Y; *pU = U; *pV = V; 253 } 254 }; 255 256 /* Converts an YV12 framebuffer to RGB565 framebuffer. 257 * Param: 258 * yv12 - YV12 framebuffer. 259 * rgb - RGB565 framebuffer. 260 * width, height - Dimensions for both framebuffers. 261 */ 262 void YV12ToRGB565(const void* yv12, void* rgb, int width, int height); 263 264 /* Converts an YV12 framebuffer to RGB32 framebuffer. 265 * Param: 266 * yv12 - YV12 framebuffer. 267 * rgb - RGB32 framebuffer. 268 * width, height - Dimensions for both framebuffers. 269 */ 270 void YV12ToRGB32(const void* yv12, void* rgb, int width, int height); 271 272 /* Converts an YU12 framebuffer to RGB32 framebuffer. 273 * Param: 274 * yu12 - YU12 framebuffer. 275 * rgb - RGB32 framebuffer. 276 * width, height - Dimensions for both framebuffers. 277 */ 278 void YU12ToRGB32(const void* yu12, void* rgb, int width, int height); 279 280 /* Converts an NV12 framebuffer to RGB565 framebuffer. 281 * Param: 282 * nv12 - NV12 framebuffer. 283 * rgb - RGB565 framebuffer. 284 * width, height - Dimensions for both framebuffers. 285 */ 286 void NV12ToRGB565(const void* nv12, void* rgb, int width, int height); 287 288 /* Converts an NV12 framebuffer to RGB32 framebuffer. 289 * Param: 290 * nv12 - NV12 framebuffer. 291 * rgb - RGB32 framebuffer. 292 * width, height - Dimensions for both framebuffers. 293 */ 294 void NV12ToRGB32(const void* nv12, void* rgb, int width, int height); 295 296 /* Converts an NV21 framebuffer to RGB565 framebuffer. 297 * Param: 298 * nv21 - NV21 framebuffer. 299 * rgb - RGB565 framebuffer. 300 * width, height - Dimensions for both framebuffers. 301 */ 302 void NV21ToRGB565(const void* nv21, void* rgb, int width, int height); 303 304 /* Converts an NV21 framebuffer to RGB32 framebuffer. 305 * Param: 306 * nv21 - NV21 framebuffer. 307 * rgb - RGB32 framebuffer. 308 * width, height - Dimensions for both framebuffers. 309 */ 310 void NV21ToRGB32(const void* nv21, void* rgb, int width, int height); 311 312 }; /* namespace android */ 313 314 #endif /* HW_EMULATOR_CAMERA_CONVERTERS_H */ 315
