1 // Copyright 2014 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(s): Branimir Vasic (branimir.vasic@imgtec.com) 13 // Djordje Pesut (djordje.pesut@imgtec.com) 14 15 #include "./dsp.h" 16 17 // Code is disabled for now, in favor of the plain-C version 18 // TODO(djordje.pesut): adapt the code to reflect the C-version. 19 #if 0 // defined(WEBP_USE_MIPS_DSP_R2) 20 21 #include <assert.h> 22 #include "./yuv.h" 23 24 #if !defined(WEBP_YUV_USE_TABLE) 25 26 #define YUV_TO_RGB(Y, U, V, R, G, B) do { \ 27 const int t1 = kYScale * Y; \ 28 const int t2 = kVToG * V; \ 29 R = kVToR * V; \ 30 G = kUToG * U; \ 31 B = kUToB * U; \ 32 R = t1 + R; \ 33 G = t1 - G; \ 34 B = t1 + B; \ 35 R = R + kRCst; \ 36 G = G - t2 + kGCst; \ 37 B = B + kBCst; \ 38 __asm__ volatile ( \ 39 "shll_s.w %[" #R "], %[" #R "], 9 \n\t" \ 40 "shll_s.w %[" #G "], %[" #G "], 9 \n\t" \ 41 "shll_s.w %[" #B "], %[" #B "], 9 \n\t" \ 42 "precrqu_s.qb.ph %[" #R "], %[" #R "], $zero \n\t" \ 43 "precrqu_s.qb.ph %[" #G "], %[" #G "], $zero \n\t" \ 44 "precrqu_s.qb.ph %[" #B "], %[" #B "], $zero \n\t" \ 45 "srl %[" #R "], %[" #R "], 24 \n\t" \ 46 "srl %[" #G "], %[" #G "], 24 \n\t" \ 47 "srl %[" #B "], %[" #B "], 24 \n\t" \ 48 : [R]"+r"(R), [G]"+r"(G), [B]"+r"(B) \ 49 : \ 50 ); \ 51 } while (0) 52 53 static WEBP_INLINE void YuvToRgb(int y, int u, int v, uint8_t* const rgb) { 54 int r, g, b; 55 YUV_TO_RGB(y, u, v, r, g, b); 56 rgb[0] = r; 57 rgb[1] = g; 58 rgb[2] = b; 59 } 60 static WEBP_INLINE void YuvToBgr(int y, int u, int v, uint8_t* const bgr) { 61 int r, g, b; 62 YUV_TO_RGB(y, u, v, r, g, b); 63 bgr[0] = b; 64 bgr[1] = g; 65 bgr[2] = r; 66 } 67 static WEBP_INLINE void YuvToRgb565(int y, int u, int v, uint8_t* const rgb) { 68 int r, g, b; 69 YUV_TO_RGB(y, u, v, r, g, b); 70 { 71 const int rg = (r & 0xf8) | (g >> 5); 72 const int gb = ((g << 3) & 0xe0) | (b >> 3); 73 #ifdef WEBP_SWAP_16BIT_CSP 74 rgb[0] = gb; 75 rgb[1] = rg; 76 #else 77 rgb[0] = rg; 78 rgb[1] = gb; 79 #endif 80 } 81 } 82 static WEBP_INLINE void YuvToRgba4444(int y, int u, int v, 83 uint8_t* const argb) { 84 int r, g, b; 85 YUV_TO_RGB(y, u, v, r, g, b); 86 { 87 const int rg = (r & 0xf0) | (g >> 4); 88 const int ba = (b & 0xf0) | 0x0f; // overwrite the lower 4 bits 89 #ifdef WEBP_SWAP_16BIT_CSP 90 argb[0] = ba; 91 argb[1] = rg; 92 #else 93 argb[0] = rg; 94 argb[1] = ba; 95 #endif 96 } 97 } 98 #endif // WEBP_YUV_USE_TABLE 99 100 //----------------------------------------------------------------------------- 101 // Alpha handling variants 102 103 static WEBP_INLINE void YuvToArgb(uint8_t y, uint8_t u, uint8_t v, 104 uint8_t* const argb) { 105 int r, g, b; 106 YUV_TO_RGB(y, u, v, r, g, b); 107 argb[0] = 0xff; 108 argb[1] = r; 109 argb[2] = g; 110 argb[3] = b; 111 } 112 static WEBP_INLINE void YuvToBgra(uint8_t y, uint8_t u, uint8_t v, 113 uint8_t* const bgra) { 114 int r, g, b; 115 YUV_TO_RGB(y, u, v, r, g, b); 116 bgra[0] = b; 117 bgra[1] = g; 118 bgra[2] = r; 119 bgra[3] = 0xff; 120 } 121 static WEBP_INLINE void YuvToRgba(uint8_t y, uint8_t u, uint8_t v, 122 uint8_t* const rgba) { 123 int r, g, b; 124 YUV_TO_RGB(y, u, v, r, g, b); 125 rgba[0] = r; 126 rgba[1] = g; 127 rgba[2] = b; 128 rgba[3] = 0xff; 129 } 130 131 //------------------------------------------------------------------------------ 132 // Fancy upsampler 133 134 #ifdef FANCY_UPSAMPLING 135 136 // Given samples laid out in a square as: 137 // [a b] 138 // [c d] 139 // we interpolate u/v as: 140 // ([9*a + 3*b + 3*c + d 3*a + 9*b + 3*c + d] + [8 8]) / 16 141 // ([3*a + b + 9*c + 3*d a + 3*b + 3*c + 9*d] [8 8]) / 16 142 143 // We process u and v together stashed into 32bit (16bit each). 144 #define LOAD_UV(u, v) ((u) | ((v) << 16)) 145 146 #define UPSAMPLE_FUNC(FUNC_NAME, FUNC, XSTEP) \ 147 static void FUNC_NAME(const uint8_t* top_y, const uint8_t* bottom_y, \ 148 const uint8_t* top_u, const uint8_t* top_v, \ 149 const uint8_t* cur_u, const uint8_t* cur_v, \ 150 uint8_t* top_dst, uint8_t* bottom_dst, int len) { \ 151 int x; \ 152 const int last_pixel_pair = (len - 1) >> 1; \ 153 uint32_t tl_uv = LOAD_UV(top_u[0], top_v[0]); /* top-left sample */ \ 154 uint32_t l_uv = LOAD_UV(cur_u[0], cur_v[0]); /* left-sample */ \ 155 assert(top_y != NULL); \ 156 { \ 157 const uint32_t uv0 = (3 * tl_uv + l_uv + 0x00020002u) >> 2; \ 158 FUNC(top_y[0], uv0 & 0xff, (uv0 >> 16), top_dst); \ 159 } \ 160 if (bottom_y != NULL) { \ 161 const uint32_t uv0 = (3 * l_uv + tl_uv + 0x00020002u) >> 2; \ 162 FUNC(bottom_y[0], uv0 & 0xff, (uv0 >> 16), bottom_dst); \ 163 } \ 164 for (x = 1; x <= last_pixel_pair; ++x) { \ 165 const uint32_t t_uv = LOAD_UV(top_u[x], top_v[x]); /* top sample */ \ 166 const uint32_t uv = LOAD_UV(cur_u[x], cur_v[x]); /* sample */ \ 167 /* precompute invariant values associated with first and second diagonals*/\ 168 const uint32_t avg = tl_uv + t_uv + l_uv + uv + 0x00080008u; \ 169 const uint32_t diag_12 = (avg + 2 * (t_uv + l_uv)) >> 3; \ 170 const uint32_t diag_03 = (avg + 2 * (tl_uv + uv)) >> 3; \ 171 { \ 172 const uint32_t uv0 = (diag_12 + tl_uv) >> 1; \ 173 const uint32_t uv1 = (diag_03 + t_uv) >> 1; \ 174 FUNC(top_y[2 * x - 1], uv0 & 0xff, (uv0 >> 16), \ 175 top_dst + (2 * x - 1) * XSTEP); \ 176 FUNC(top_y[2 * x - 0], uv1 & 0xff, (uv1 >> 16), \ 177 top_dst + (2 * x - 0) * XSTEP); \ 178 } \ 179 if (bottom_y != NULL) { \ 180 const uint32_t uv0 = (diag_03 + l_uv) >> 1; \ 181 const uint32_t uv1 = (diag_12 + uv) >> 1; \ 182 FUNC(bottom_y[2 * x - 1], uv0 & 0xff, (uv0 >> 16), \ 183 bottom_dst + (2 * x - 1) * XSTEP); \ 184 FUNC(bottom_y[2 * x + 0], uv1 & 0xff, (uv1 >> 16), \ 185 bottom_dst + (2 * x + 0) * XSTEP); \ 186 } \ 187 tl_uv = t_uv; \ 188 l_uv = uv; \ 189 } \ 190 if (!(len & 1)) { \ 191 { \ 192 const uint32_t uv0 = (3 * tl_uv + l_uv + 0x00020002u) >> 2; \ 193 FUNC(top_y[len - 1], uv0 & 0xff, (uv0 >> 16), \ 194 top_dst + (len - 1) * XSTEP); \ 195 } \ 196 if (bottom_y != NULL) { \ 197 const uint32_t uv0 = (3 * l_uv + tl_uv + 0x00020002u) >> 2; \ 198 FUNC(bottom_y[len - 1], uv0 & 0xff, (uv0 >> 16), \ 199 bottom_dst + (len - 1) * XSTEP); \ 200 } \ 201 } \ 202 } 203 204 // All variants implemented. 205 UPSAMPLE_FUNC(UpsampleRgbLinePair, YuvToRgb, 3) 206 UPSAMPLE_FUNC(UpsampleBgrLinePair, YuvToBgr, 3) 207 UPSAMPLE_FUNC(UpsampleRgbaLinePair, YuvToRgba, 4) 208 UPSAMPLE_FUNC(UpsampleBgraLinePair, YuvToBgra, 4) 209 UPSAMPLE_FUNC(UpsampleArgbLinePair, YuvToArgb, 4) 210 UPSAMPLE_FUNC(UpsampleRgba4444LinePair, YuvToRgba4444, 2) 211 UPSAMPLE_FUNC(UpsampleRgb565LinePair, YuvToRgb565, 2) 212 213 #undef LOAD_UV 214 #undef UPSAMPLE_FUNC 215 216 //------------------------------------------------------------------------------ 217 // Entry point 218 219 extern void WebPInitUpsamplersMIPSdspR2(void); 220 221 WEBP_TSAN_IGNORE_FUNCTION void WebPInitUpsamplersMIPSdspR2(void) { 222 WebPUpsamplers[MODE_RGB] = UpsampleRgbLinePair; 223 WebPUpsamplers[MODE_RGBA] = UpsampleRgbaLinePair; 224 WebPUpsamplers[MODE_BGR] = UpsampleBgrLinePair; 225 WebPUpsamplers[MODE_BGRA] = UpsampleBgraLinePair; 226 WebPUpsamplers[MODE_ARGB] = UpsampleArgbLinePair; 227 WebPUpsamplers[MODE_RGBA_4444] = UpsampleRgba4444LinePair; 228 WebPUpsamplers[MODE_RGB_565] = UpsampleRgb565LinePair; 229 WebPUpsamplers[MODE_rgbA] = UpsampleRgbaLinePair; 230 WebPUpsamplers[MODE_bgrA] = UpsampleBgraLinePair; 231 WebPUpsamplers[MODE_Argb] = UpsampleArgbLinePair; 232 WebPUpsamplers[MODE_rgbA_4444] = UpsampleRgba4444LinePair; 233 } 234 235 #endif // FANCY_UPSAMPLING 236 237 //------------------------------------------------------------------------------ 238 // YUV444 converter 239 240 #define YUV444_FUNC(FUNC_NAME, FUNC, XSTEP) \ 241 static void FUNC_NAME(const uint8_t* y, const uint8_t* u, const uint8_t* v, \ 242 uint8_t* dst, int len) { \ 243 int i; \ 244 for (i = 0; i < len; ++i) FUNC(y[i], u[i], v[i], &dst[i * XSTEP]); \ 245 } 246 247 YUV444_FUNC(Yuv444ToRgb, YuvToRgb, 3) 248 YUV444_FUNC(Yuv444ToBgr, YuvToBgr, 3) 249 YUV444_FUNC(Yuv444ToRgba, YuvToRgba, 4) 250 YUV444_FUNC(Yuv444ToBgra, YuvToBgra, 4) 251 YUV444_FUNC(Yuv444ToArgb, YuvToArgb, 4) 252 YUV444_FUNC(Yuv444ToRgba4444, YuvToRgba4444, 2) 253 YUV444_FUNC(Yuv444ToRgb565, YuvToRgb565, 2) 254 255 #undef YUV444_FUNC 256 257 //------------------------------------------------------------------------------ 258 // Entry point 259 260 extern void WebPInitYUV444ConvertersMIPSdspR2(void); 261 262 WEBP_TSAN_IGNORE_FUNCTION void WebPInitYUV444ConvertersMIPSdspR2(void) { 263 WebPYUV444Converters[MODE_RGB] = Yuv444ToRgb; 264 WebPYUV444Converters[MODE_RGBA] = Yuv444ToRgba; 265 WebPYUV444Converters[MODE_BGR] = Yuv444ToBgr; 266 WebPYUV444Converters[MODE_BGRA] = Yuv444ToBgra; 267 WebPYUV444Converters[MODE_ARGB] = Yuv444ToArgb; 268 WebPYUV444Converters[MODE_RGBA_4444] = Yuv444ToRgba4444; 269 WebPYUV444Converters[MODE_RGB_565] = Yuv444ToRgb565; 270 WebPYUV444Converters[MODE_rgbA] = Yuv444ToRgba; 271 WebPYUV444Converters[MODE_bgrA] = Yuv444ToBgra; 272 WebPYUV444Converters[MODE_Argb] = Yuv444ToArgb; 273 WebPYUV444Converters[MODE_rgbA_4444] = Yuv444ToRgba4444; 274 } 275 276 #else // !WEBP_USE_MIPS_DSP_R2 277 278 WEBP_DSP_INIT_STUB(WebPInitYUV444ConvertersMIPSdspR2) 279 280 #endif // WEBP_USE_MIPS_DSP_R2 281 282 #if 1 // !(defined(FANCY_UPSAMPLING) && defined(WEBP_USE_MIPS_DSP_R2)) 283 WEBP_DSP_INIT_STUB(WebPInitUpsamplersMIPSdspR2) 284 #endif 285