media/base/simd/convert_yuv_to_rgb_c.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "media/base/simd/convert_yuv_to_rgb.h"
   6 #include "media/base/simd/yuv_to_rgb_table.h"
   7
   8 namespace media {
   9
  10 #define packuswb(x) ((x) < 0 ? 0 : ((x) > 255 ? 255 : (x)))
  11 #define paddsw(x, y) (((x) + (y)) < -32768 ? -32768 : \
  12     (((x) + (y)) > 32767 ? 32767 : ((x) + (y))))
  13
  14 // On Android, pixel layout is RGBA (see skia/include/core/SkColorPriv.h);
  15 // however, other Chrome platforms use BGRA (see skia/config/SkUserConfig.h).
  16 // Ideally, android should not use the functions here due to performance issue
  17 // (http://crbug.com/249980).
  18 #if defined(OS_ANDROID)
  19 #define SK_R32_SHIFT    0
  20 #define SK_G32_SHIFT    8
  21 #define SK_B32_SHIFT    16
  22 #define SK_A32_SHIFT    24
  23 #define R_INDEX         0
  24 #define G_INDEX         1
  25 #define B_INDEX         2
  26 #define A_INDEX         3
  27 #else
  28 #define SK_B32_SHIFT    0
  29 #define SK_G32_SHIFT    8
  30 #define SK_R32_SHIFT    16
  31 #define SK_A32_SHIFT    24
  32 #define B_INDEX         0
  33 #define G_INDEX         1
  34 #define R_INDEX         2
  35 #define A_INDEX         3
  36 #endif
  37
  38 static inline void ConvertYUVToRGB32_C(uint8 y,
  39                                        uint8 u,
  40                                        uint8 v,
  41                                        uint8* rgb_buf,
  42                                        const int16 convert_table[1024][4]) {
  43   int b = convert_table[256+u][B_INDEX];
  44   int g = convert_table[256+u][G_INDEX];
  45   int r = convert_table[256+u][R_INDEX];
  46   int a = convert_table[256+u][A_INDEX];
  47
  48   b = paddsw(b, convert_table[512+v][B_INDEX]);
  49   g = paddsw(g, convert_table[512+v][G_INDEX]);
  50   r = paddsw(r, convert_table[512+v][R_INDEX]);
  51   a = paddsw(a, convert_table[512+v][A_INDEX]);
  52
  53   b = paddsw(b, convert_table[y][B_INDEX]);
  54   g = paddsw(g, convert_table[y][G_INDEX]);
  55   r = paddsw(r, convert_table[y][R_INDEX]);
  56   a = paddsw(a, convert_table[y][A_INDEX]);
  57
  58   b >>= 6;
  59   g >>= 6;
  60   r >>= 6;
  61   a >>= 6;
  62
  63   *reinterpret_cast<uint32*>(rgb_buf) = (packuswb(b) << SK_B32_SHIFT) |
  64                                         (packuswb(g) << SK_G32_SHIFT) |
  65                                         (packuswb(r) << SK_R32_SHIFT) |
  66                                         (packuswb(a) << SK_A32_SHIFT);
  67 }
  68
  69 static inline void ConvertYUVAToARGB_C(uint8 y,
  70                                        uint8 u,
  71                                        uint8 v,
  72                                        uint8 a,
  73                                        uint8* rgb_buf,
  74                                        const int16 convert_table[1024][4]) {
  75   int b = convert_table[256+u][0];
  76   int g = convert_table[256+u][1];
  77   int r = convert_table[256+u][2];
  78
  79   b = paddsw(b, convert_table[512+v][0]);
  80   g = paddsw(g, convert_table[512+v][1]);
  81   r = paddsw(r, convert_table[512+v][2]);
  82
  83   b = paddsw(b, convert_table[y][0]);
  84   g = paddsw(g, convert_table[y][1]);
  85   r = paddsw(r, convert_table[y][2]);
  86
  87   b >>= 6;
  88   g >>= 6;
  89   r >>= 6;
  90
  91   b = packuswb(b) * a >> 8;
  92   g = packuswb(g) * a >> 8;
  93   r = packuswb(r) * a >> 8;
  94
  95   *reinterpret_cast<uint32*>(rgb_buf) = (b << SK_B32_SHIFT) |
  96                                         (g << SK_G32_SHIFT) |
  97                                         (r << SK_R32_SHIFT) |
  98                                         (a << SK_A32_SHIFT);
  99 }
 100
 101 void ConvertYUVToRGB32Row_C(const uint8* y_buf,
 102                             const uint8* u_buf,
 103                             const uint8* v_buf,
 104                             uint8* rgb_buf,
 105                             ptrdiff_t width,
 106                             const int16 convert_table[1024][4]) {
 107   for (int x = 0; x < width; x += 2) {
 108     uint8 u = u_buf[x >> 1];
 109     uint8 v = v_buf[x >> 1];
 110     uint8 y0 = y_buf[x];
 111     ConvertYUVToRGB32_C(y0, u, v, rgb_buf, convert_table);
 112     if ((x + 1) < width) {
 113       uint8 y1 = y_buf[x + 1];
 114       ConvertYUVToRGB32_C(y1, u, v, rgb_buf + 4, convert_table);
 115     }
 116     rgb_buf += 8;  // Advance 2 pixels.
 117   }
 118 }
 119
 120 void ConvertYUVAToARGBRow_C(const uint8* y_buf,
 121                             const uint8* u_buf,
 122                             const uint8* v_buf,
 123                             const uint8* a_buf,
 124                             uint8* rgba_buf,
 125                             ptrdiff_t width,
 126                             const int16 convert_table[1024][4]) {
 127   for (int x = 0; x < width; x += 2) {
 128     uint8 u = u_buf[x >> 1];
 129     uint8 v = v_buf[x >> 1];
 130     uint8 y0 = y_buf[x];
 131     uint8 a0 = a_buf[x];
 132     ConvertYUVAToARGB_C(y0, u, v, a0, rgba_buf, convert_table);
 133     if ((x + 1) < width) {
 134       uint8 y1 = y_buf[x + 1];
 135       uint8 a1 = a_buf[x + 1];
 136       ConvertYUVAToARGB_C(y1, u, v, a1, rgba_buf + 4, convert_table);
 137     }
 138     rgba_buf += 8;  // Advance 2 pixels.
 139   }
 140 }
 141
 142 // 16.16 fixed point is used.  A shift by 16 isolates the integer.
 143 // A shift by 17 is used to further subsample the chrominence channels.
 144 // & 0xffff isolates the fixed point fraction.  >> 2 to get the upper 2 bits,
 145 // for 1/65536 pixel accurate interpolation.
 146 void ScaleYUVToRGB32Row_C(const uint8* y_buf,
 147                           const uint8* u_buf,
 148                           const uint8* v_buf,
 149                           uint8* rgb_buf,
 150                           ptrdiff_t width,
 151                           ptrdiff_t source_dx,
 152                           const int16 convert_table[1024][4]) {
 153   int x = 0;
 154   for (int i = 0; i < width; i += 2) {
 155     int y = y_buf[x >> 16];
 156     int u = u_buf[(x >> 17)];
 157     int v = v_buf[(x >> 17)];
 158     ConvertYUVToRGB32_C(y, u, v, rgb_buf, convert_table);
 159     x += source_dx;
 160     if ((i + 1) < width) {
 161       y = y_buf[x >> 16];
 162       ConvertYUVToRGB32_C(y, u, v, rgb_buf+4, convert_table);
 163       x += source_dx;
 164     }
 165     rgb_buf += 8;
 166   }
 167 }
 168
 169 void LinearScaleYUVToRGB32Row_C(const uint8* y_buf,
 170                                 const uint8* u_buf,
 171                                 const uint8* v_buf,
 172                                 uint8* rgb_buf,
 173                                 ptrdiff_t width,
 174                                 ptrdiff_t source_dx,
 175                                 const int16 convert_table[1024][4]) {
 176   // Avoid point-sampling for down-scaling by > 2:1.
 177   int source_x = 0;
 178   if (source_dx >= 0x20000)
 179     source_x += 0x8000;
 180   LinearScaleYUVToRGB32RowWithRange_C(y_buf, u_buf, v_buf, rgb_buf, width,
 181                                       source_x, source_dx, convert_table);
 182 }
 183
 184 void LinearScaleYUVToRGB32RowWithRange_C(const uint8* y_buf,
 185                                          const uint8* u_buf,
 186                                          const uint8* v_buf,
 187                                          uint8* rgb_buf,
 188                                          int dest_width,
 189                                          int x,
 190                                          int source_dx,
 191                                          const int16 convert_table[1024][4]) {
 192   for (int i = 0; i < dest_width; i += 2) {
 193     int y0 = y_buf[x >> 16];
 194     int y1 = y_buf[(x >> 16) + 1];
 195     int u0 = u_buf[(x >> 17)];
 196     int u1 = u_buf[(x >> 17) + 1];
 197     int v0 = v_buf[(x >> 17)];
 198     int v1 = v_buf[(x >> 17) + 1];
 199     int y_frac = (x & 65535);
 200     int uv_frac = ((x >> 1) & 65535);
 201     int y = (y_frac * y1 + (y_frac ^ 65535) * y0) >> 16;
 202     int u = (uv_frac * u1 + (uv_frac ^ 65535) * u0) >> 16;
 203     int v = (uv_frac * v1 + (uv_frac ^ 65535) * v0) >> 16;
 204     ConvertYUVToRGB32_C(y, u, v, rgb_buf, convert_table);
 205     x += source_dx;
 206     if ((i + 1) < dest_width) {
 207       y0 = y_buf[x >> 16];
 208       y1 = y_buf[(x >> 16) + 1];
 209       y_frac = (x & 65535);
 210       y = (y_frac * y1 + (y_frac ^ 65535) * y0) >> 16;
 211       ConvertYUVToRGB32_C(y, u, v, rgb_buf+4, convert_table);
 212       x += source_dx;
 213     }
 214     rgb_buf += 8;
 215   }
 216 }
 217
 218 void ConvertYUVToRGB32_C(const uint8* yplane,
 219                          const uint8* uplane,
 220                          const uint8* vplane,
 221                          uint8* rgbframe,
 222                          int width,
 223                          int height,
 224                          int ystride,
 225                          int uvstride,
 226                          int rgbstride,
 227                          YUVType yuv_type) {
 228   unsigned int y_shift = GetVerticalShift(yuv_type);
 229   for (int y = 0; y < height; ++y) {
 230     uint8* rgb_row = rgbframe + y * rgbstride;
 231     const uint8* y_ptr = yplane + y * ystride;
 232     const uint8* u_ptr = uplane + (y >> y_shift) * uvstride;
 233     const uint8* v_ptr = vplane + (y >> y_shift) * uvstride;
 234
 235     ConvertYUVToRGB32Row_C(y_ptr,
 236                            u_ptr,
 237                            v_ptr,
 238                            rgb_row,
 239                            width,
 240                            GetLookupTable(yuv_type));
 241   }
 242 }
 243
 244 void ConvertYUVAToARGB_C(const uint8* yplane,
 245                          const uint8* uplane,
 246                          const uint8* vplane,
 247                          const uint8* aplane,
 248                          uint8* rgbaframe,
 249                          int width,
 250                          int height,
 251                          int ystride,
 252                          int uvstride,
 253                          int astride,
 254                          int rgbastride,
 255                          YUVType yuv_type) {
 256   unsigned int y_shift = yuv_type;
 257   for (int y = 0; y < height; y++) {
 258     uint8* rgba_row = rgbaframe + y * rgbastride;
 259     const uint8* y_ptr = yplane + y * ystride;
 260     const uint8* u_ptr = uplane + (y >> y_shift) * uvstride;
 261     const uint8* v_ptr = vplane + (y >> y_shift) * uvstride;
 262     const uint8* a_ptr = aplane + y * astride;
 263
 264     ConvertYUVAToARGBRow_C(y_ptr,
 265                            u_ptr,
 266                            v_ptr,
 267                            a_ptr,
 268                            rgba_row,
 269                            width,
 270                            GetLookupTable(yuv_type));
 271   }
 272 }
 273
 274 }  // namespace media