1 // Copyright 2011 Google Inc. All Rights Reserved. 2 // 3 // Use of this source code is governed by a BSD-style license 4 // that can be found in the COPYING file in the root of the source 5 // tree. An additional intellectual property rights grant can be found 6 // in the file PATENTS. All contributing project authors may 7 // be found in the AUTHORS file in the root of the source tree. 8 // ----------------------------------------------------------------------------- 9 // 10 // YUV to RGB upsampling functions. 11 // 12 // Author: somnath (at) google.com (Somnath Banerjee) 13 14 #include "./dsp.h" 15 #include "./yuv.h" 16 17 #include <assert.h> 18 19 //------------------------------------------------------------------------------ 20 // Fancy upsampler 21 22 #ifdef FANCY_UPSAMPLING 23 24 // Fancy upsampling functions to convert YUV to RGB 25 WebPUpsampleLinePairFunc WebPUpsamplers[MODE_LAST]; 26 27 // Given samples laid out in a square as: 28 // [a b] 29 // [c d] 30 // we interpolate u/v as: 31 // ([9*a + 3*b + 3*c + d 3*a + 9*b + 3*c + d] + [8 8]) / 16 32 // ([3*a + b + 9*c + 3*d a + 3*b + 3*c + 9*d] [8 8]) / 16 33 34 // We process u and v together stashed into 32bit (16bit each). 35 #define LOAD_UV(u, v) ((u) | ((v) << 16)) 36 37 #define UPSAMPLE_FUNC(FUNC_NAME, FUNC, XSTEP) \ 38 static void FUNC_NAME(const uint8_t* top_y, const uint8_t* bottom_y, \ 39 const uint8_t* top_u, const uint8_t* top_v, \ 40 const uint8_t* cur_u, const uint8_t* cur_v, \ 41 uint8_t* top_dst, uint8_t* bottom_dst, int len) { \ 42 int x; \ 43 const int last_pixel_pair = (len - 1) >> 1; \ 44 uint32_t tl_uv = LOAD_UV(top_u[0], top_v[0]); /* top-left sample */ \ 45 uint32_t l_uv = LOAD_UV(cur_u[0], cur_v[0]); /* left-sample */ \ 46 assert(top_y != NULL); \ 47 { \ 48 const uint32_t uv0 = (3 * tl_uv + l_uv + 0x00020002u) >> 2; \ 49 FUNC(top_y[0], uv0 & 0xff, (uv0 >> 16), top_dst); \ 50 } \ 51 if (bottom_y != NULL) { \ 52 const uint32_t uv0 = (3 * l_uv + tl_uv + 0x00020002u) >> 2; \ 53 FUNC(bottom_y[0], uv0 & 0xff, (uv0 >> 16), bottom_dst); \ 54 } \ 55 for (x = 1; x <= last_pixel_pair; ++x) { \ 56 const uint32_t t_uv = LOAD_UV(top_u[x], top_v[x]); /* top sample */ \ 57 const uint32_t uv = LOAD_UV(cur_u[x], cur_v[x]); /* sample */ \ 58 /* precompute invariant values associated with first and second diagonals*/\ 59 const uint32_t avg = tl_uv + t_uv + l_uv + uv + 0x00080008u; \ 60 const uint32_t diag_12 = (avg + 2 * (t_uv + l_uv)) >> 3; \ 61 const uint32_t diag_03 = (avg + 2 * (tl_uv + uv)) >> 3; \ 62 { \ 63 const uint32_t uv0 = (diag_12 + tl_uv) >> 1; \ 64 const uint32_t uv1 = (diag_03 + t_uv) >> 1; \ 65 FUNC(top_y[2 * x - 1], uv0 & 0xff, (uv0 >> 16), \ 66 top_dst + (2 * x - 1) * XSTEP); \ 67 FUNC(top_y[2 * x - 0], uv1 & 0xff, (uv1 >> 16), \ 68 top_dst + (2 * x - 0) * XSTEP); \ 69 } \ 70 if (bottom_y != NULL) { \ 71 const uint32_t uv0 = (diag_03 + l_uv) >> 1; \ 72 const uint32_t uv1 = (diag_12 + uv) >> 1; \ 73 FUNC(bottom_y[2 * x - 1], uv0 & 0xff, (uv0 >> 16), \ 74 bottom_dst + (2 * x - 1) * XSTEP); \ 75 FUNC(bottom_y[2 * x + 0], uv1 & 0xff, (uv1 >> 16), \ 76 bottom_dst + (2 * x + 0) * XSTEP); \ 77 } \ 78 tl_uv = t_uv; \ 79 l_uv = uv; \ 80 } \ 81 if (!(len & 1)) { \ 82 { \ 83 const uint32_t uv0 = (3 * tl_uv + l_uv + 0x00020002u) >> 2; \ 84 FUNC(top_y[len - 1], uv0 & 0xff, (uv0 >> 16), \ 85 top_dst + (len - 1) * XSTEP); \ 86 } \ 87 if (bottom_y != NULL) { \ 88 const uint32_t uv0 = (3 * l_uv + tl_uv + 0x00020002u) >> 2; \ 89 FUNC(bottom_y[len - 1], uv0 & 0xff, (uv0 >> 16), \ 90 bottom_dst + (len - 1) * XSTEP); \ 91 } \ 92 } \ 93 } 94 95 // All variants implemented. 96 UPSAMPLE_FUNC(UpsampleRgbLinePair, VP8YuvToRgb, 3) 97 UPSAMPLE_FUNC(UpsampleBgrLinePair, VP8YuvToBgr, 3) 98 UPSAMPLE_FUNC(UpsampleRgbaLinePair, VP8YuvToRgba, 4) 99 UPSAMPLE_FUNC(UpsampleBgraLinePair, VP8YuvToBgra, 4) 100 UPSAMPLE_FUNC(UpsampleArgbLinePair, VP8YuvToArgb, 4) 101 UPSAMPLE_FUNC(UpsampleRgba4444LinePair, VP8YuvToRgba4444, 2) 102 UPSAMPLE_FUNC(UpsampleRgb565LinePair, VP8YuvToRgb565, 2) 103 104 #undef LOAD_UV 105 #undef UPSAMPLE_FUNC 106 107 #endif // FANCY_UPSAMPLING 108 109 //------------------------------------------------------------------------------ 110 111 #if !defined(FANCY_UPSAMPLING) 112 #define DUAL_SAMPLE_FUNC(FUNC_NAME, FUNC) \ 113 static void FUNC_NAME(const uint8_t* top_y, const uint8_t* bot_y, \ 114 const uint8_t* top_u, const uint8_t* top_v, \ 115 const uint8_t* bot_u, const uint8_t* bot_v, \ 116 uint8_t* top_dst, uint8_t* bot_dst, int len) { \ 117 const int half_len = len >> 1; \ 118 int x; \ 119 assert(top_dst != NULL); \ 120 { \ 121 for (x = 0; x < half_len; ++x) { \ 122 FUNC(top_y[2 * x + 0], top_u[x], top_v[x], top_dst + 8 * x + 0); \ 123 FUNC(top_y[2 * x + 1], top_u[x], top_v[x], top_dst + 8 * x + 4); \ 124 } \ 125 if (len & 1) FUNC(top_y[2 * x + 0], top_u[x], top_v[x], top_dst + 8 * x); \ 126 } \ 127 if (bot_dst != NULL) { \ 128 for (x = 0; x < half_len; ++x) { \ 129 FUNC(bot_y[2 * x + 0], bot_u[x], bot_v[x], bot_dst + 8 * x + 0); \ 130 FUNC(bot_y[2 * x + 1], bot_u[x], bot_v[x], bot_dst + 8 * x + 4); \ 131 } \ 132 if (len & 1) FUNC(bot_y[2 * x + 0], bot_u[x], bot_v[x], bot_dst + 8 * x); \ 133 } \ 134 } 135 136 DUAL_SAMPLE_FUNC(DualLineSamplerBGRA, VP8YuvToBgra) 137 DUAL_SAMPLE_FUNC(DualLineSamplerARGB, VP8YuvToArgb) 138 #undef DUAL_SAMPLE_FUNC 139 140 #endif // !FANCY_UPSAMPLING 141 142 WebPUpsampleLinePairFunc WebPGetLinePairConverter(int alpha_is_last) { 143 WebPInitUpsamplers(); 144 VP8YUVInit(); 145 #ifdef FANCY_UPSAMPLING 146 return WebPUpsamplers[alpha_is_last ? MODE_BGRA : MODE_ARGB]; 147 #else 148 return (alpha_is_last ? DualLineSamplerBGRA : DualLineSamplerARGB); 149 #endif 150 } 151 152 //------------------------------------------------------------------------------ 153 // YUV444 converter 154 155 #define YUV444_FUNC(FUNC_NAME, FUNC, XSTEP) \ 156 extern void FUNC_NAME(const uint8_t* y, const uint8_t* u, const uint8_t* v, \ 157 uint8_t* dst, int len); \ 158 void FUNC_NAME(const uint8_t* y, const uint8_t* u, const uint8_t* v, \ 159 uint8_t* dst, int len) { \ 160 int i; \ 161 for (i = 0; i < len; ++i) FUNC(y[i], u[i], v[i], &dst[i * XSTEP]); \ 162 } 163 164 YUV444_FUNC(WebPYuv444ToRgbC, VP8YuvToRgb, 3) 165 YUV444_FUNC(WebPYuv444ToBgrC, VP8YuvToBgr, 3) 166 YUV444_FUNC(WebPYuv444ToRgbaC, VP8YuvToRgba, 4) 167 YUV444_FUNC(WebPYuv444ToBgraC, VP8YuvToBgra, 4) 168 YUV444_FUNC(WebPYuv444ToArgbC, VP8YuvToArgb, 4) 169 YUV444_FUNC(WebPYuv444ToRgba4444C, VP8YuvToRgba4444, 2) 170 YUV444_FUNC(WebPYuv444ToRgb565C, VP8YuvToRgb565, 2) 171 172 #undef YUV444_FUNC 173 174 WebPYUV444Converter WebPYUV444Converters[MODE_LAST]; 175 176 extern void WebPInitYUV444ConvertersMIPSdspR2(void); 177 extern void WebPInitYUV444ConvertersSSE2(void); 178 179 static volatile VP8CPUInfo upsampling_last_cpuinfo_used1 = 180 (VP8CPUInfo)&upsampling_last_cpuinfo_used1; 181 182 WEBP_TSAN_IGNORE_FUNCTION void WebPInitYUV444Converters(void) { 183 if (upsampling_last_cpuinfo_used1 == VP8GetCPUInfo) return; 184 185 WebPYUV444Converters[MODE_RGB] = WebPYuv444ToRgbC; 186 WebPYUV444Converters[MODE_RGBA] = WebPYuv444ToRgbaC; 187 WebPYUV444Converters[MODE_BGR] = WebPYuv444ToBgrC; 188 WebPYUV444Converters[MODE_BGRA] = WebPYuv444ToBgraC; 189 WebPYUV444Converters[MODE_ARGB] = WebPYuv444ToArgbC; 190 WebPYUV444Converters[MODE_RGBA_4444] = WebPYuv444ToRgba4444C; 191 WebPYUV444Converters[MODE_RGB_565] = WebPYuv444ToRgb565C; 192 WebPYUV444Converters[MODE_rgbA] = WebPYuv444ToRgbaC; 193 WebPYUV444Converters[MODE_bgrA] = WebPYuv444ToBgraC; 194 WebPYUV444Converters[MODE_Argb] = WebPYuv444ToArgbC; 195 WebPYUV444Converters[MODE_rgbA_4444] = WebPYuv444ToRgba4444C; 196 197 if (VP8GetCPUInfo != NULL) { 198 #if defined(WEBP_USE_SSE2) 199 if (VP8GetCPUInfo(kSSE2)) { 200 WebPInitYUV444ConvertersSSE2(); 201 } 202 #endif 203 #if defined(WEBP_USE_MIPS_DSP_R2) 204 if (VP8GetCPUInfo(kMIPSdspR2)) { 205 WebPInitYUV444ConvertersMIPSdspR2(); 206 } 207 #endif 208 } 209 upsampling_last_cpuinfo_used1 = VP8GetCPUInfo; 210 } 211 212 //------------------------------------------------------------------------------ 213 // Main calls 214 215 extern void WebPInitUpsamplersSSE2(void); 216 extern void WebPInitUpsamplersNEON(void); 217 extern void WebPInitUpsamplersMIPSdspR2(void); 218 219 static volatile VP8CPUInfo upsampling_last_cpuinfo_used2 = 220 (VP8CPUInfo)&upsampling_last_cpuinfo_used2; 221 222 WEBP_TSAN_IGNORE_FUNCTION void WebPInitUpsamplers(void) { 223 if (upsampling_last_cpuinfo_used2 == VP8GetCPUInfo) return; 224 225 #ifdef FANCY_UPSAMPLING 226 WebPUpsamplers[MODE_RGB] = UpsampleRgbLinePair; 227 WebPUpsamplers[MODE_RGBA] = UpsampleRgbaLinePair; 228 WebPUpsamplers[MODE_BGR] = UpsampleBgrLinePair; 229 WebPUpsamplers[MODE_BGRA] = UpsampleBgraLinePair; 230 WebPUpsamplers[MODE_ARGB] = UpsampleArgbLinePair; 231 WebPUpsamplers[MODE_RGBA_4444] = UpsampleRgba4444LinePair; 232 WebPUpsamplers[MODE_RGB_565] = UpsampleRgb565LinePair; 233 WebPUpsamplers[MODE_rgbA] = UpsampleRgbaLinePair; 234 WebPUpsamplers[MODE_bgrA] = UpsampleBgraLinePair; 235 WebPUpsamplers[MODE_Argb] = UpsampleArgbLinePair; 236 WebPUpsamplers[MODE_rgbA_4444] = UpsampleRgba4444LinePair; 237 238 // If defined, use CPUInfo() to overwrite some pointers with faster versions. 239 if (VP8GetCPUInfo != NULL) { 240 #if defined(WEBP_USE_SSE2) 241 if (VP8GetCPUInfo(kSSE2)) { 242 WebPInitUpsamplersSSE2(); 243 } 244 #endif 245 #if defined(WEBP_USE_NEON) 246 if (VP8GetCPUInfo(kNEON)) { 247 WebPInitUpsamplersNEON(); 248 } 249 #endif 250 #if defined(WEBP_USE_MIPS_DSP_R2) 251 if (VP8GetCPUInfo(kMIPSdspR2)) { 252 WebPInitUpsamplersMIPSdspR2(); 253 } 254 #endif 255 } 256 #endif // FANCY_UPSAMPLING 257 upsampling_last_cpuinfo_used2 = VP8GetCPUInfo; 258 } 259 260 //------------------------------------------------------------------------------ 261
