git.sesse.net Git - vlc/blob - modules/video_chroma/i420_rgb.h

   1 /*****************************************************************************
   2  * i420_rgb.h : YUV to bitmap RGB conversion module for vlc
   3  *****************************************************************************
   4  * Copyright (C) 2000 VideoLAN
   5  * $Id: i420_rgb.h,v 1.1 2002/08/04 17:23:43 sam Exp $
   6  *
   7  * Authors: Samuel Hocevar <sam@zoy.org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * chroma_sys_t: chroma method descriptor
  26  *****************************************************************************
  27  * This structure is part of the chroma transformation descriptor, it
  28  * describes the yuv2rgb specific properties.
  29  *****************************************************************************/
  30 struct chroma_sys_t
  31 {
  32     u8  *p_buffer;
  33     int *p_offset;
  34
  35 #ifdef MODULE_NAME_IS_i420_rgb
  36     /* Pre-calculated conversion tables */
  37     void *p_base;                          /* base for all conversion tables */
  38     u8   *p_rgb8;                                        /* RGB 8 bits table */
  39     u16  *p_rgb16;                                      /* RGB 16 bits table */
  40     u32  *p_rgb32;                                      /* RGB 32 bits table */
  41 #endif
  42 };
  43
  44 /*****************************************************************************
  45  * Prototypes
  46  *****************************************************************************/
  47 #ifdef MODULE_NAME_IS_i420_rgb
  48 void E_(I420_RGB8) ( vout_thread_t *, picture_t *, picture_t * );
  49 #endif
  50 void E_(I420_RGB15)( vout_thread_t *, picture_t *, picture_t * );
  51 void E_(I420_RGB16)( vout_thread_t *, picture_t *, picture_t * );
  52 void E_(I420_RGB32)( vout_thread_t *, picture_t *, picture_t * );
  53
  54 /*****************************************************************************
  55  * CONVERT_*_PIXEL: pixel conversion macros
  56  *****************************************************************************
  57  * These conversion routines are used by YUV conversion functions.
  58  * conversion are made from p_y, p_u, p_v, which are modified, to p_buffer,
  59  * which is also modified. CONVERT_4YUV_PIXEL is used for 8bpp dithering,
  60  * CONVERT_4YUV_PIXEL_SCALE does the same but also scales the output.
  61  *****************************************************************************/
  62 #define CONVERT_Y_PIXEL( BPP )                                                \
  63     /* Only Y sample is present */                                            \
  64     p_ybase = p_yuv + *p_y++;                                                 \
  65     *p_buffer++ = p_ybase[RED_OFFSET-((V_RED_COEF*128)>>SHIFT) + i_red] |     \
  66         p_ybase[GREEN_OFFSET-(((U_GREEN_COEF+V_GREEN_COEF)*128)>>SHIFT)       \
  67         + i_green ] | p_ybase[BLUE_OFFSET-((U_BLUE_COEF*128)>>SHIFT) + i_blue];
  68
  69 #define CONVERT_YUV_PIXEL( BPP )                                              \
  70     /* Y, U and V samples are present */                                      \
  71     i_uval =    *p_u++;                                                       \
  72     i_vval =    *p_v++;                                                       \
  73     i_red =     (V_RED_COEF * i_vval) >> SHIFT;                               \
  74     i_green =   (U_GREEN_COEF * i_uval + V_GREEN_COEF * i_vval) >> SHIFT;     \
  75     i_blue =    (U_BLUE_COEF * i_uval) >> SHIFT;                              \
  76     CONVERT_Y_PIXEL( BPP )                                                    \
  77
  78 #define CONVERT_4YUV_PIXEL( CHROMA )                                          \
  79     *p_pic++ = p_lookup[                                                      \
  80         (((*p_y++ + dither10[i_real_y]) >> 4) << 7)                           \
  81       + ((*p_u + dither20[i_real_y]) >> 5) * 9                                \
  82       + ((*p_v + dither20[i_real_y]) >> 5) ];                                 \
  83     *p_pic++ = p_lookup[                                                      \
  84         (((*p_y++ + dither11[i_real_y]) >> 4) << 7)                           \
  85       + ((*p_u++ + dither21[i_real_y]) >> 5) * 9                              \
  86       + ((*p_v++ + dither21[i_real_y]) >> 5) ];                               \
  87     *p_pic++ = p_lookup[                                                      \
  88         (((*p_y++ + dither12[i_real_y]) >> 4) << 7)                           \
  89       + ((*p_u + dither22[i_real_y]) >> 5) * 9                                \
  90       + ((*p_v + dither22[i_real_y]) >> 5) ];                                 \
  91     *p_pic++ = p_lookup[                                                      \
  92         (((*p_y++ + dither13[i_real_y]) >> 4) << 7)                           \
  93       + ((*p_u++ + dither23[i_real_y]) >> 5) * 9                              \
  94       + ((*p_v++ + dither23[i_real_y]) >> 5) ];                               \
  95
  96 #define CONVERT_4YUV_PIXEL_SCALE( CHROMA )                                    \
  97     *p_pic++ = p_lookup[                                                      \
  98         ( ((*p_y + dither10[i_real_y]) >> 4) << 7)                            \
  99         + ((*p_u + dither20[i_real_y]) >> 5) * 9                              \
 100         + ((*p_v + dither20[i_real_y]) >> 5) ];                               \
 101     p_y += *p_offset++;                                                       \
 102     p_u += *p_offset;                                                         \
 103     p_v += *p_offset++;                                                       \
 104     *p_pic++ = p_lookup[                                                      \
 105         ( ((*p_y + dither11[i_real_y]) >> 4) << 7)                            \
 106         + ((*p_u + dither21[i_real_y]) >> 5) * 9                              \
 107         + ((*p_v + dither21[i_real_y]) >> 5) ];                               \
 108     p_y += *p_offset++;                                                       \
 109     p_u += *p_offset;                                                         \
 110     p_v += *p_offset++;                                                       \
 111     *p_pic++ = p_lookup[                                                      \
 112         ( ((*p_y + dither12[i_real_y]) >> 4) << 7)                            \
 113         + ((*p_u + dither22[i_real_y]) >> 5) * 9                              \
 114         + ((*p_v + dither22[i_real_y]) >> 5) ];                               \
 115     p_y += *p_offset++;                                                       \
 116     p_u += *p_offset;                                                         \
 117     p_v += *p_offset++;                                                       \
 118     *p_pic++ = p_lookup[                                                      \
 119         ( ((*p_y + dither13[i_real_y]) >> 4) << 7)                            \
 120         + ((*p_u + dither23[i_real_y]) >> 5) * 9                              \
 121         + ((*p_v + dither23[i_real_y]) >> 5) ];                               \
 122     p_y += *p_offset++;                                                       \
 123     p_u += *p_offset;                                                         \
 124     p_v += *p_offset++;                                                       \
 125
 126 /*****************************************************************************
 127  * SCALE_WIDTH: scale a line horizontally
 128  *****************************************************************************
 129  * This macro scales a line using rendering buffer and offset array. It works
 130  * for 1, 2 and 4 Bpp.
 131  *****************************************************************************/
 132 #define SCALE_WIDTH                                                           \
 133     if( b_hscale )                                                            \
 134     {                                                                         \
 135         /* Horizontal scaling, conversion has been done to buffer.            \
 136          * Rewind buffer and offset, then copy and scale line */              \
 137         p_buffer = p_buffer_start;                                            \
 138         p_offset = p_offset_start;                                            \
 139         for( i_x = p_vout->output.i_width / 16; i_x--; )                      \
 140         {                                                                     \
 141             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 142             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 143             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 144             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 145             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 146             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 147             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 148             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 149             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 150             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 151             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 152             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 153             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 154             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 155             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 156             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 157         }                                                                     \
 158         for( i_x = p_vout->output.i_width & 15; i_x--; )                      \
 159         {                                                                     \
 160             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 161         }                                                                     \
 162         p_pic += i_right_margin;                                              \
 163     }                                                                         \
 164     else                                                                      \
 165     {                                                                         \
 166         /* No scaling, conversion has been done directly in picture memory.   \
 167          * Increment of picture pointer to end of line is still needed */     \
 168         (u8*)p_pic += p_dest->p->i_pitch;                                     \
 169     }                                                                         \
 170
 171 /*****************************************************************************
 172  * SCALE_WIDTH_DITHER: scale a line horizontally for dithered 8 bpp
 173  *****************************************************************************
 174  * This macro scales a line using an offset array.
 175  *****************************************************************************/
 176 #define SCALE_WIDTH_DITHER( CHROMA )                                          \
 177     if( b_hscale )                                                            \
 178     {                                                                         \
 179         /* Horizontal scaling - we can't use a buffer due to dithering */     \
 180         p_offset = p_offset_start;                                            \
 181         for( i_x = p_vout->output.i_width / 16; i_x--; )                      \
 182         {                                                                     \
 183             CONVERT_4YUV_PIXEL_SCALE( CHROMA )                                \
 184             CONVERT_4YUV_PIXEL_SCALE( CHROMA )                                \
 185             CONVERT_4YUV_PIXEL_SCALE( CHROMA )                                \
 186             CONVERT_4YUV_PIXEL_SCALE( CHROMA )                                \
 187         }                                                                     \
 188     }                                                                         \
 189     else                                                                      \
 190     {                                                                         \
 191         for( i_x = p_vout->render.i_width / 16; i_x--;  )                     \
 192         {                                                                     \
 193             CONVERT_4YUV_PIXEL( CHROMA )                                      \
 194             CONVERT_4YUV_PIXEL( CHROMA )                                      \
 195             CONVERT_4YUV_PIXEL( CHROMA )                                      \
 196             CONVERT_4YUV_PIXEL( CHROMA )                                      \
 197         }                                                                     \
 198     }                                                                         \
 199     /* Increment of picture pointer to end of line is still needed */         \
 200     p_pic += i_right_margin;                                                  \
 201                                                                               \
 202     /* Increment the Y coordinate in the matrix, modulo 4 */                  \
 203     i_real_y = (i_real_y + 1) & 0x3;                                          \
 204
 205 /*****************************************************************************
 206  * SCALE_HEIGHT: handle vertical scaling
 207  *****************************************************************************
 208  * This macro handle vertical scaling for a picture. CHROMA may be 420, 422 or
 209  * 444 for RGB conversion, or 400 for gray conversion. It works for 1, 2, 3
 210  * and 4 Bpp.
 211  *****************************************************************************/
 212 #define SCALE_HEIGHT( CHROMA, BPP )                                           \
 213     /* If line is odd, rewind 4:2:0 U and V samples */                        \
 214     if( ((CHROMA == 420) || (CHROMA == 422)) && !(i_y & 0x1) )                \
 215     {                                                                         \
 216         p_u -= i_chroma_width;                                                \
 217         p_v -= i_chroma_width;                                                \
 218     }                                                                         \
 219                                                                               \
 220     /*                                                                        \
 221      * Handle vertical scaling. The current line can be copied or next one    \
 222      * can be ignored.                                                        \
 223      */                                                                       \
 224     switch( i_vscale )                                                        \
 225     {                                                                         \
 226     case -1:                             /* vertical scaling factor is < 1 */ \
 227         while( (i_scale_count -= p_vout->output.i_height) > 0 )               \
 228         {                                                                     \
 229             /* Height reduction: skip next source line */                     \
 230             p_y += p_vout->render.i_width;                                    \
 231             i_y++;                                                            \
 232             if( (CHROMA == 420) || (CHROMA == 422) )                          \
 233             {                                                                 \
 234                 if( i_y & 0x1 )                                               \
 235                 {                                                             \
 236                     p_u += i_chroma_width;                                    \
 237                     p_v += i_chroma_width;                                    \
 238                 }                                                             \
 239             }                                                                 \
 240             else if( CHROMA == 444 )                                          \
 241             {                                                                 \
 242                 p_u += p_vout->render.i_width;                                \
 243                 p_v += p_vout->render.i_width;                                \
 244             }                                                                 \
 245         }                                                                     \
 246         i_scale_count += p_vout->render.i_height;                             \
 247         break;                                                                \
 248     case 1:                              /* vertical scaling factor is > 1 */ \
 249         while( (i_scale_count -= p_vout->render.i_height) > 0 )               \
 250         {                                                                     \
 251             /* Height increment: copy previous picture line */                \
 252             p_vout->p_vlc->pf_memcpy( p_pic, p_pic_start,                     \
 253                                       p_vout->output.i_width * BPP );         \
 254             (u8*)p_pic += p_dest->p->i_pitch;                                 \
 255         }                                                                     \
 256         i_scale_count += p_vout->output.i_height;                             \
 257         break;                                                                \
 258     }                                                                         \
 259
 260 /*****************************************************************************
 261  * SCALE_HEIGHT_DITHER: handle vertical scaling for dithered 8 bpp
 262  *****************************************************************************
 263  * This macro handles vertical scaling for a picture. CHROMA may be 420,
 264  * 422 or 444 for RGB conversion, or 400 for gray conversion.
 265  *****************************************************************************/
 266 #define SCALE_HEIGHT_DITHER( CHROMA )                                         \
 267                                                                               \
 268     /* If line is odd, rewind 4:2:0 U and V samples */                        \
 269     if( ((CHROMA == 420) || (CHROMA == 422)) && !(i_y & 0x1) )                \
 270     {                                                                         \
 271         p_u -= i_chroma_width;                                                \
 272         p_v -= i_chroma_width;                                                \
 273     }                                                                         \
 274                                                                               \
 275     /*                                                                        \
 276      * Handle vertical scaling. The current line can be copied or next one    \
 277      * can be ignored.                                                        \
 278      */                                                                       \
 279                                                                               \
 280     switch( i_vscale )                                                        \
 281     {                                                                         \
 282     case -1:                             /* vertical scaling factor is < 1 */ \
 283         while( (i_scale_count -= p_vout->output.i_height) > 0 )               \
 284         {                                                                     \
 285             /* Height reduction: skip next source line */                     \
 286             p_y += p_vout->render.i_width;                                    \
 287             i_y++;                                                            \
 288             if( (CHROMA == 420) || (CHROMA == 422) )                          \
 289             {                                                                 \
 290                 if( i_y & 0x1 )                                               \
 291                 {                                                             \
 292                     p_u += i_chroma_width;                                    \
 293                     p_v += i_chroma_width;                                    \
 294                 }                                                             \
 295             }                                                                 \
 296             else if( CHROMA == 444 )                                          \
 297             {                                                                 \
 298                 p_u += p_vout->render.i_width;                                \
 299                 p_v += p_vout->render.i_width;                                \
 300             }                                                                 \
 301         }                                                                     \
 302         i_scale_count += p_vout->render.i_height;                             \
 303         break;                                                                \
 304     case 1:                              /* vertical scaling factor is > 1 */ \
 305         while( (i_scale_count -= p_vout->render.i_height) > 0 )               \
 306         {                                                                     \
 307             p_y -= p_vout->render.i_width;                                    \
 308             p_u -= i_chroma_width;                                            \
 309             p_v -= i_chroma_width;                                            \
 310             SCALE_WIDTH_DITHER( CHROMA );                                     \
 311         }                                                                     \
 312         i_scale_count += p_vout->output.i_height;                             \
 313         break;                                                                \
 314     }                                                                         \
 315