git.sesse.net Git - vlc/blob - plugins/chroma/transforms.h

   1 /*****************************************************************************
   2  * transforms_common.h: Chroma transformation macros
   3  *****************************************************************************
   4  * Copyright (C) 1999, 2000, 2001 VideoLAN
   5  * $Id: transforms.h,v 1.1 2001/12/16 16:18:36 sam Exp $
   6  *
   7  * Authors: Vincent Seguin <seguin@via.ecp.fr>
   8  *          Samuel Hocevar <sam@zoy.org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public
  21  * License along with this program; if not, write to the
  22  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  23  * Boston, MA 02111-1307, USA.
  24  *****************************************************************************/
  25
  26 /*****************************************************************************
  27  * CONVERT_*_PIXEL: pixel conversion macros
  28  *****************************************************************************
  29  * These conversion routines are used by YUV conversion functions.
  30  * conversion are made from p_y, p_u, p_v, which are modified, to p_buffer,
  31  * which is also modified. CONVERT_4YUV_PIXEL is used for 8bpp dithering,
  32  * CONVERT_4YUV_PIXEL_SCALE does the same but also scales the output.
  33  *****************************************************************************/
  34 #define CONVERT_Y_PIXEL( BPP )                                                \
  35     /* Only Y sample is present */                                            \
  36     p_ybase = p_yuv + *p_y++;                                                 \
  37     *p_buffer++ = p_ybase[RED_OFFSET-((V_RED_COEF*128)>>SHIFT) + i_red] |     \
  38         p_ybase[GREEN_OFFSET-(((U_GREEN_COEF+V_GREEN_COEF)*128)>>SHIFT)       \
  39         + i_green ] | p_ybase[BLUE_OFFSET-((U_BLUE_COEF*128)>>SHIFT) + i_blue];
  40
  41 #define CONVERT_YUV_PIXEL( BPP )                                              \
  42     /* Y, U and V samples are present */                                      \
  43     i_uval =    *p_u++;                                                       \
  44     i_vval =    *p_v++;                                                       \
  45     i_red =     (V_RED_COEF * i_vval) >> SHIFT;                               \
  46     i_green =   (U_GREEN_COEF * i_uval + V_GREEN_COEF * i_vval) >> SHIFT;     \
  47     i_blue =    (U_BLUE_COEF * i_uval) >> SHIFT;                              \
  48     CONVERT_Y_PIXEL( BPP )                                                    \
  49
  50 #define CONVERT_4YUV_PIXEL( CHROMA )                                         \
  51     *p_pic++ = p_lookup[                                                      \
  52         (((*p_y++ + dither10[i_real_y]) >> 4) << 7)                           \
  53       + ((*p_u + dither20[i_real_y]) >> 5) * 9                                \
  54       + ((*p_v + dither20[i_real_y]) >> 5) ];                                 \
  55     *p_pic++ = p_lookup[                                                      \
  56         (((*p_y++ + dither11[i_real_y]) >> 4) << 7)                           \
  57       + ((*p_u++ + dither21[i_real_y]) >> 5) * 9                              \
  58       + ((*p_v++ + dither21[i_real_y]) >> 5) ];                               \
  59     *p_pic++ = p_lookup[                                                      \
  60         (((*p_y++ + dither12[i_real_y]) >> 4) << 7)                           \
  61       + ((*p_u + dither22[i_real_y]) >> 5) * 9                                \
  62       + ((*p_v + dither22[i_real_y]) >> 5) ];                                 \
  63     *p_pic++ = p_lookup[                                                      \
  64         (((*p_y++ + dither13[i_real_y]) >> 4) << 7)                           \
  65       + ((*p_u++ + dither23[i_real_y]) >> 5) * 9                              \
  66       + ((*p_v++ + dither23[i_real_y]) >> 5) ];                               \
  67
  68 #define CONVERT_4YUV_PIXEL_SCALE( CHROMA )                                   \
  69     *p_pic++ = p_lookup[                                                      \
  70         ( ((*p_y + dither10[i_real_y]) >> 4) << 7)                            \
  71         + ((*p_u + dither20[i_real_y]) >> 5) * 9                              \
  72         + ((*p_v + dither20[i_real_y]) >> 5) ];                               \
  73     p_y += *p_offset++;                                                       \
  74     p_u += *p_offset;                                                         \
  75     p_v += *p_offset++;                                                       \
  76     *p_pic++ = p_lookup[                                                      \
  77         ( ((*p_y + dither11[i_real_y]) >> 4) << 7)                            \
  78         + ((*p_u + dither21[i_real_y]) >> 5) * 9                              \
  79         + ((*p_v + dither21[i_real_y]) >> 5) ];                               \
  80     p_y += *p_offset++;                                                       \
  81     p_u += *p_offset;                                                         \
  82     p_v += *p_offset++;                                                       \
  83     *p_pic++ = p_lookup[                                                      \
  84         ( ((*p_y + dither12[i_real_y]) >> 4) << 7)                            \
  85         + ((*p_u + dither22[i_real_y]) >> 5) * 9                              \
  86         + ((*p_v + dither22[i_real_y]) >> 5) ];                               \
  87     p_y += *p_offset++;                                                       \
  88     p_u += *p_offset;                                                         \
  89     p_v += *p_offset++;                                                       \
  90     *p_pic++ = p_lookup[                                                      \
  91         ( ((*p_y + dither13[i_real_y]) >> 4) << 7)                            \
  92         + ((*p_u + dither23[i_real_y]) >> 5) * 9                              \
  93         + ((*p_v + dither23[i_real_y]) >> 5) ];                               \
  94     p_y += *p_offset++;                                                       \
  95     p_u += *p_offset;                                                         \
  96     p_v += *p_offset++;                                                       \
  97
  98 /*****************************************************************************
  99  * SCALE_WIDTH: scale a line horizontally
 100  *****************************************************************************
 101  * This macro scales a line using rendering buffer and offset array. It works
 102  * for 1, 2 and 4 Bpp.
 103  *****************************************************************************/
 104 #define SCALE_WIDTH                                                           \
 105     if( b_horizontal_scaling )                                                \
 106     {                                                                         \
 107         /* Horizontal scaling, conversion has been done to buffer.            \
 108          * Rewind buffer and offset, then copy and scale line */              \
 109         p_buffer = p_buffer_start;                                            \
 110         p_offset = p_offset_start;                                            \
 111         for( i_x = i_pic_width / 16; i_x--; )                                 \
 112         {                                                                     \
 113             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 114             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 115             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 116             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 117             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 118             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 119             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 120             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 121             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 122             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 123             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 124             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 125             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 126             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 127             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 128             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 129         }                                                                     \
 130         p_pic += i_pic_line_width;                                            \
 131     }                                                                         \
 132     else                                                                      \
 133     {                                                                         \
 134         /* No scaling, conversion has been done directly in picture memory.   \
 135          * Increment of picture pointer to end of line is still needed */     \
 136         p_pic += i_pic_width + i_pic_line_width;                              \
 137     }                                                                         \
 138
 139 /*****************************************************************************
 140  * SCALE_WIDTH_DITHER: scale a line horizontally for dithered 8 bpp
 141  *****************************************************************************
 142  * This macro scales a line using an offset array.
 143  *****************************************************************************/
 144 #define SCALE_WIDTH_DITHER( CHROMA )                                          \
 145     if( b_horizontal_scaling )                                                \
 146     {                                                                         \
 147         /* Horizontal scaling - we can't use a buffer due to dithering */     \
 148         p_offset = p_offset_start;                                            \
 149         for( i_x = i_pic_width / 16; i_x--; )                                 \
 150         {                                                                     \
 151             CONVERT_4YUV_PIXEL_SCALE( CHROMA )                               \
 152             CONVERT_4YUV_PIXEL_SCALE( CHROMA )                               \
 153             CONVERT_4YUV_PIXEL_SCALE( CHROMA )                               \
 154             CONVERT_4YUV_PIXEL_SCALE( CHROMA )                               \
 155         }                                                                     \
 156     }                                                                         \
 157     else                                                                      \
 158     {                                                                         \
 159         for( i_x = i_width / 16; i_x--;  )                                    \
 160         {                                                                     \
 161             CONVERT_4YUV_PIXEL( CHROMA )                                     \
 162             CONVERT_4YUV_PIXEL( CHROMA )                                     \
 163             CONVERT_4YUV_PIXEL( CHROMA )                                     \
 164             CONVERT_4YUV_PIXEL( CHROMA )                                     \
 165         }                                                                     \
 166     }                                                                         \
 167     /* Increment of picture pointer to end of line is still needed */         \
 168     p_pic += i_pic_line_width;                                                \
 169                                                                               \
 170     /* Increment the Y coordinate in the matrix, modulo 4 */                  \
 171     i_real_y = (i_real_y + 1) & 0x3;                                          \
 172
 173 /*****************************************************************************
 174  * SCALE_HEIGHT: handle vertical scaling
 175  *****************************************************************************
 176  * This macro handle vertical scaling for a picture. CHROMA may be 420, 422 or
 177  * 444 for RGB conversion, or 400 for gray conversion. It works for 1, 2, 3
 178  * and 4 Bpp.
 179  *****************************************************************************/
 180 #define SCALE_HEIGHT( CHROMA, BPP )                                           \
 181     /* If line is odd, rewind 4:2:0 U and V samples */                        \
 182     if( ((CHROMA == 420) || (CHROMA == 422)) && !(i_y & 0x1) )                \
 183     {                                                                         \
 184         p_u -= i_chroma_width;                                                \
 185         p_v -= i_chroma_width;                                                \
 186     }                                                                         \
 187                                                                               \
 188     /*                                                                        \
 189      * Handle vertical scaling. The current line can be copied or next one    \
 190      * can be ignored.                                                        \
 191      */                                                                       \
 192     switch( i_vertical_scaling )                                              \
 193     {                                                                         \
 194     case -1:                             /* vertical scaling factor is < 1 */ \
 195         while( (i_scale_count -= i_pic_height) > 0 )                          \
 196         {                                                                     \
 197             /* Height reduction: skip next source line */                     \
 198             p_y += i_width;                                                   \
 199             i_y++;                                                            \
 200             if( (CHROMA == 420) || (CHROMA == 422) )                          \
 201             {                                                                 \
 202                 if( i_y & 0x1 )                                               \
 203                 {                                                             \
 204                     p_u += i_chroma_width;                                    \
 205                     p_v += i_chroma_width;                                    \
 206                 }                                                             \
 207             }                                                                 \
 208             else if( CHROMA == 444 )                                          \
 209             {                                                                 \
 210                 p_u += i_width;                                               \
 211                 p_v += i_width;                                               \
 212             }                                                                 \
 213         }                                                                     \
 214         i_scale_count += i_height;                                            \
 215         break;                                                                \
 216     case 1:                              /* vertical scaling factor is > 1 */ \
 217         while( (i_scale_count -= i_height) > 0 )                              \
 218         {                                                                     \
 219             /* Height increment: copy previous picture line */                \
 220             for( i_x = i_pic_width / 16; i_x--; )                             \
 221             {                                                                 \
 222                 *(((u64 *) p_pic)++) = *(((u64 *) p_pic_start)++ );           \
 223                 *(((u64 *) p_pic)++) = *(((u64 *) p_pic_start)++ );           \
 224                 if( BPP > 1 )                               /* 2, 3, 4 Bpp */ \
 225                 {                                                             \
 226                     *(((u64 *) p_pic)++) = *(((u64 *) p_pic_start)++ );       \
 227                     *(((u64 *) p_pic)++) = *(((u64 *) p_pic_start)++ );       \
 228                 }                                                             \
 229                 if( BPP > 2 )                                  /* 3, 4 Bpp */ \
 230                 {                                                             \
 231                     *(((u64 *) p_pic)++) = *(((u64 *) p_pic_start)++ );       \
 232                     *(((u64 *) p_pic)++) = *(((u64 *) p_pic_start)++ );       \
 233                 }                                                             \
 234                 if( BPP > 3 )                                     /* 4 Bpp */ \
 235                 {                                                             \
 236                     *(((u64 *) p_pic)++) = *(((u64 *) p_pic_start)++ );       \
 237                     *(((u64 *) p_pic)++) = *(((u64 *) p_pic_start)++ );       \
 238                 }                                                             \
 239             }                                                                 \
 240             p_pic +=        i_pic_line_width;                                 \
 241             p_pic_start +=  i_pic_line_width;                                 \
 242         }                                                                     \
 243         i_scale_count += i_pic_height;                                        \
 244         break;                                                                \
 245     }                                                                         \
 246
 247 /*****************************************************************************
 248  * SCALE_HEIGHT_DITHER: handle vertical scaling for dithered 8 bpp
 249  *****************************************************************************
 250  * This macro handles vertical scaling for a picture. CHROMA may be 420,
 251  * 422 or 444 for RGB conversion, or 400 for gray conversion.
 252  *****************************************************************************/
 253 #define SCALE_HEIGHT_DITHER( CHROMA )                                         \
 254                                                                               \
 255     /* If line is odd, rewind 4:2:0 U and V samples */                        \
 256     if( ((CHROMA == 420) || (CHROMA == 422)) && !(i_y & 0x1) )                \
 257     {                                                                         \
 258         p_u -= i_chroma_width;                                                \
 259         p_v -= i_chroma_width;                                                \
 260     }                                                                         \
 261                                                                               \
 262     /*                                                                        \
 263      * Handle vertical scaling. The current line can be copied or next one    \
 264      * can be ignored.                                                        \
 265      */                                                                       \
 266                                                                               \
 267     switch( i_vertical_scaling )                                              \
 268     {                                                                         \
 269     case -1:                             /* vertical scaling factor is < 1 */ \
 270         while( (i_scale_count -= i_pic_height) > 0 )                          \
 271         {                                                                     \
 272             /* Height reduction: skip next source line */                     \
 273             p_y += i_width;                                                   \
 274             i_y++;                                                            \
 275             if( (CHROMA == 420) || (CHROMA == 422) )                          \
 276             {                                                                 \
 277                 if( i_y & 0x1 )                                               \
 278                 {                                                             \
 279                     p_u += i_chroma_width;                                    \
 280                     p_v += i_chroma_width;                                    \
 281                 }                                                             \
 282             }                                                                 \
 283             else if( CHROMA == 444 )                                          \
 284             {                                                                 \
 285                 p_u += i_width;                                               \
 286                 p_v += i_width;                                               \
 287             }                                                                 \
 288         }                                                                     \
 289         i_scale_count += i_height;                                            \
 290         break;                                                                \
 291     case 1:                              /* vertical scaling factor is > 1 */ \
 292         while( (i_scale_count -= i_height) > 0 )                              \
 293         {                                                                     \
 294             p_y -= i_width;                                                   \
 295             p_u -= i_chroma_width;                                            \
 296             p_v -= i_chroma_width;                                            \
 297             SCALE_WIDTH_DITHER( CHROMA );                                     \
 298         }                                                                     \
 299         i_scale_count += i_pic_height;                                        \
 300         break;                                                                \
 301     }                                                                         \
 302