git.sesse.net Git - vlc/blob - plugins/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 1.4 2002/03/16 23:03:19 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 typedef struct chroma_sys_s
  31 {
  32     u8  *p_buffer;
  33     int *p_offset;
  34
  35 #ifdef MODULE_NAME_IS_chroma_i420_rgb
  36     /* Pre-calculated conversion tables */
  37     void *              p_base;            /* base for all conversion tables */
  38     union
  39     {
  40         u8 *            p_rgb8;                          /* RGB 8 bits table */
  41         u16 *           p_rgb16;                        /* RGB 16 bits table */
  42         u32 *           p_rgb32;                        /* RGB 32 bits table */
  43     } yuv;
  44 #endif
  45
  46 } chroma_sys_t;
  47
  48 /*****************************************************************************
  49  * Prototypes
  50  *****************************************************************************/
  51 #ifdef MODULE_NAME_IS_chroma_i420_rgb
  52 void _M( I420_RGB8 ) ( vout_thread_t *, picture_t *, picture_t * );
  53 #endif
  54 void _M( I420_RGB15 )( vout_thread_t *, picture_t *, picture_t * );
  55 void _M( I420_RGB16 )( vout_thread_t *, picture_t *, picture_t * );
  56 void _M( I420_RGB32 )( vout_thread_t *, picture_t *, picture_t * );
  57
  58 /*****************************************************************************
  59  * CONVERT_*_PIXEL: pixel conversion macros
  60  *****************************************************************************
  61  * These conversion routines are used by YUV conversion functions.
  62  * conversion are made from p_y, p_u, p_v, which are modified, to p_buffer,
  63  * which is also modified. CONVERT_4YUV_PIXEL is used for 8bpp dithering,
  64  * CONVERT_4YUV_PIXEL_SCALE does the same but also scales the output.
  65  *****************************************************************************/
  66 #define CONVERT_Y_PIXEL( BPP )                                                \
  67     /* Only Y sample is present */                                            \
  68     p_ybase = p_yuv + *p_y++;                                                 \
  69     *p_buffer++ = p_ybase[RED_OFFSET-((V_RED_COEF*128)>>SHIFT) + i_red] |     \
  70         p_ybase[GREEN_OFFSET-(((U_GREEN_COEF+V_GREEN_COEF)*128)>>SHIFT)       \
  71         + i_green ] | p_ybase[BLUE_OFFSET-((U_BLUE_COEF*128)>>SHIFT) + i_blue];
  72
  73 #define CONVERT_YUV_PIXEL( BPP )                                              \
  74     /* Y, U and V samples are present */                                      \
  75     i_uval =    *p_u++;                                                       \
  76     i_vval =    *p_v++;                                                       \
  77     i_red =     (V_RED_COEF * i_vval) >> SHIFT;                               \
  78     i_green =   (U_GREEN_COEF * i_uval + V_GREEN_COEF * i_vval) >> SHIFT;     \
  79     i_blue =    (U_BLUE_COEF * i_uval) >> SHIFT;                              \
  80     CONVERT_Y_PIXEL( BPP )                                                    \
  81
  82 #define CONVERT_4YUV_PIXEL( CHROMA )                                          \
  83     *p_pic++ = p_lookup[                                                      \
  84         (((*p_y++ + dither10[i_real_y]) >> 4) << 7)                           \
  85       + ((*p_u + dither20[i_real_y]) >> 5) * 9                                \
  86       + ((*p_v + dither20[i_real_y]) >> 5) ];                                 \
  87     *p_pic++ = p_lookup[                                                      \
  88         (((*p_y++ + dither11[i_real_y]) >> 4) << 7)                           \
  89       + ((*p_u++ + dither21[i_real_y]) >> 5) * 9                              \
  90       + ((*p_v++ + dither21[i_real_y]) >> 5) ];                               \
  91     *p_pic++ = p_lookup[                                                      \
  92         (((*p_y++ + dither12[i_real_y]) >> 4) << 7)                           \
  93       + ((*p_u + dither22[i_real_y]) >> 5) * 9                                \
  94       + ((*p_v + dither22[i_real_y]) >> 5) ];                                 \
  95     *p_pic++ = p_lookup[                                                      \
  96         (((*p_y++ + dither13[i_real_y]) >> 4) << 7)                           \
  97       + ((*p_u++ + dither23[i_real_y]) >> 5) * 9                              \
  98       + ((*p_v++ + dither23[i_real_y]) >> 5) ];                               \
  99
 100 #define CONVERT_4YUV_PIXEL_SCALE( CHROMA )                                    \
 101     *p_pic++ = p_lookup[                                                      \
 102         ( ((*p_y + dither10[i_real_y]) >> 4) << 7)                            \
 103         + ((*p_u + dither20[i_real_y]) >> 5) * 9                              \
 104         + ((*p_v + dither20[i_real_y]) >> 5) ];                               \
 105     p_y += *p_offset++;                                                       \
 106     p_u += *p_offset;                                                         \
 107     p_v += *p_offset++;                                                       \
 108     *p_pic++ = p_lookup[                                                      \
 109         ( ((*p_y + dither11[i_real_y]) >> 4) << 7)                            \
 110         + ((*p_u + dither21[i_real_y]) >> 5) * 9                              \
 111         + ((*p_v + dither21[i_real_y]) >> 5) ];                               \
 112     p_y += *p_offset++;                                                       \
 113     p_u += *p_offset;                                                         \
 114     p_v += *p_offset++;                                                       \
 115     *p_pic++ = p_lookup[                                                      \
 116         ( ((*p_y + dither12[i_real_y]) >> 4) << 7)                            \
 117         + ((*p_u + dither22[i_real_y]) >> 5) * 9                              \
 118         + ((*p_v + dither22[i_real_y]) >> 5) ];                               \
 119     p_y += *p_offset++;                                                       \
 120     p_u += *p_offset;                                                         \
 121     p_v += *p_offset++;                                                       \
 122     *p_pic++ = p_lookup[                                                      \
 123         ( ((*p_y + dither13[i_real_y]) >> 4) << 7)                            \
 124         + ((*p_u + dither23[i_real_y]) >> 5) * 9                              \
 125         + ((*p_v + dither23[i_real_y]) >> 5) ];                               \
 126     p_y += *p_offset++;                                                       \
 127     p_u += *p_offset;                                                         \
 128     p_v += *p_offset++;                                                       \
 129
 130 /*****************************************************************************
 131  * SCALE_WIDTH: scale a line horizontally
 132  *****************************************************************************
 133  * This macro scales a line using rendering buffer and offset array. It works
 134  * for 1, 2 and 4 Bpp.
 135  *****************************************************************************/
 136 #define SCALE_WIDTH                                                           \
 137     if( b_hscale )                                                            \
 138     {                                                                         \
 139         /* Horizontal scaling, conversion has been done to buffer.            \
 140          * Rewind buffer and offset, then copy and scale line */              \
 141         p_buffer = p_buffer_start;                                            \
 142         p_offset = p_offset_start;                                            \
 143         for( i_x = p_vout->output.i_width / 16; i_x--; )                      \
 144         {                                                                     \
 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             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 158             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 159             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 160             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 161         }                                                                     \
 162         for( i_x = p_vout->output.i_width & 15; i_x--; )                      \
 163         {                                                                     \
 164             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 165         }                                                                     \
 166         p_pic += i_right_margin;                                              \
 167     }                                                                         \
 168     else                                                                      \
 169     {                                                                         \
 170         /* No scaling, conversion has been done directly in picture memory.   \
 171          * Increment of picture pointer to end of line is still needed */     \
 172         (u8*)p_pic += p_dest->p->i_pitch;                                     \
 173     }                                                                         \
 174
 175 /*****************************************************************************
 176  * SCALE_WIDTH_DITHER: scale a line horizontally for dithered 8 bpp
 177  *****************************************************************************
 178  * This macro scales a line using an offset array.
 179  *****************************************************************************/
 180 #define SCALE_WIDTH_DITHER( CHROMA )                                          \
 181     if( b_hscale )                                                            \
 182     {                                                                         \
 183         /* Horizontal scaling - we can't use a buffer due to dithering */     \
 184         p_offset = p_offset_start;                                            \
 185         for( i_x = p_vout->output.i_width / 16; i_x--; )                      \
 186         {                                                                     \
 187             CONVERT_4YUV_PIXEL_SCALE( CHROMA )                                \
 188             CONVERT_4YUV_PIXEL_SCALE( CHROMA )                                \
 189             CONVERT_4YUV_PIXEL_SCALE( CHROMA )                                \
 190             CONVERT_4YUV_PIXEL_SCALE( CHROMA )                                \
 191         }                                                                     \
 192     }                                                                         \
 193     else                                                                      \
 194     {                                                                         \
 195         for( i_x = p_vout->render.i_width / 16; i_x--;  )                     \
 196         {                                                                     \
 197             CONVERT_4YUV_PIXEL( CHROMA )                                      \
 198             CONVERT_4YUV_PIXEL( CHROMA )                                      \
 199             CONVERT_4YUV_PIXEL( CHROMA )                                      \
 200             CONVERT_4YUV_PIXEL( CHROMA )                                      \
 201         }                                                                     \
 202     }                                                                         \
 203     /* Increment of picture pointer to end of line is still needed */         \
 204     p_pic += i_right_margin;                                                  \
 205                                                                               \
 206     /* Increment the Y coordinate in the matrix, modulo 4 */                  \
 207     i_real_y = (i_real_y + 1) & 0x3;                                          \
 208
 209 /*****************************************************************************
 210  * SCALE_HEIGHT: handle vertical scaling
 211  *****************************************************************************
 212  * This macro handle vertical scaling for a picture. CHROMA may be 420, 422 or
 213  * 444 for RGB conversion, or 400 for gray conversion. It works for 1, 2, 3
 214  * and 4 Bpp.
 215  *****************************************************************************/
 216 #define SCALE_HEIGHT( CHROMA, BPP )                                           \
 217     /* If line is odd, rewind 4:2:0 U and V samples */                        \
 218     if( ((CHROMA == 420) || (CHROMA == 422)) && !(i_y & 0x1) )                \
 219     {                                                                         \
 220         p_u -= i_chroma_width;                                                \
 221         p_v -= i_chroma_width;                                                \
 222     }                                                                         \
 223                                                                               \
 224     /*                                                                        \
 225      * Handle vertical scaling. The current line can be copied or next one    \
 226      * can be ignored.                                                        \
 227      */                                                                       \
 228     switch( i_vscale )                                                        \
 229     {                                                                         \
 230     case -1:                             /* vertical scaling factor is < 1 */ \
 231         while( (i_scale_count -= p_vout->output.i_height) > 0 )               \
 232         {                                                                     \
 233             /* Height reduction: skip next source line */                     \
 234             p_y += p_vout->render.i_width;                                    \
 235             i_y++;                                                            \
 236             if( (CHROMA == 420) || (CHROMA == 422) )                          \
 237             {                                                                 \
 238                 if( i_y & 0x1 )                                               \
 239                 {                                                             \
 240                     p_u += i_chroma_width;                                    \
 241                     p_v += i_chroma_width;                                    \
 242                 }                                                             \
 243             }                                                                 \
 244             else if( CHROMA == 444 )                                          \
 245             {                                                                 \
 246                 p_u += p_vout->render.i_width;                                \
 247                 p_v += p_vout->render.i_width;                                \
 248             }                                                                 \
 249         }                                                                     \
 250         i_scale_count += p_vout->render.i_height;                             \
 251         break;                                                                \
 252     case 1:                              /* vertical scaling factor is > 1 */ \
 253         while( (i_scale_count -= p_vout->render.i_height) > 0 )               \
 254         {                                                                     \
 255             /* Height increment: copy previous picture line */                \
 256             FAST_MEMCPY( p_pic, p_pic_start, p_vout->output.i_width * BPP );  \
 257             (u8*)p_pic += p_dest->p->i_pitch;                                 \
 258         }                                                                     \
 259         i_scale_count += p_vout->output.i_height;                             \
 260         break;                                                                \
 261     }                                                                         \
 262
 263 /*****************************************************************************
 264  * SCALE_HEIGHT_DITHER: handle vertical scaling for dithered 8 bpp
 265  *****************************************************************************
 266  * This macro handles vertical scaling for a picture. CHROMA may be 420,
 267  * 422 or 444 for RGB conversion, or 400 for gray conversion.
 268  *****************************************************************************/
 269 #define SCALE_HEIGHT_DITHER( CHROMA )                                         \
 270                                                                               \
 271     /* If line is odd, rewind 4:2:0 U and V samples */                        \
 272     if( ((CHROMA == 420) || (CHROMA == 422)) && !(i_y & 0x1) )                \
 273     {                                                                         \
 274         p_u -= i_chroma_width;                                                \
 275         p_v -= i_chroma_width;                                                \
 276     }                                                                         \
 277                                                                               \
 278     /*                                                                        \
 279      * Handle vertical scaling. The current line can be copied or next one    \
 280      * can be ignored.                                                        \
 281      */                                                                       \
 282                                                                               \
 283     switch( i_vscale )                                                        \
 284     {                                                                         \
 285     case -1:                             /* vertical scaling factor is < 1 */ \
 286         while( (i_scale_count -= p_vout->output.i_height) > 0 )               \
 287         {                                                                     \
 288             /* Height reduction: skip next source line */                     \
 289             p_y += p_vout->render.i_width;                                    \
 290             i_y++;                                                            \
 291             if( (CHROMA == 420) || (CHROMA == 422) )                          \
 292             {                                                                 \
 293                 if( i_y & 0x1 )                                               \
 294                 {                                                             \
 295                     p_u += i_chroma_width;                                    \
 296                     p_v += i_chroma_width;                                    \
 297                 }                                                             \
 298             }                                                                 \
 299             else if( CHROMA == 444 )                                          \
 300             {                                                                 \
 301                 p_u += p_vout->render.i_width;                                \
 302                 p_v += p_vout->render.i_width;                                \
 303             }                                                                 \
 304         }                                                                     \
 305         i_scale_count += p_vout->render.i_height;                             \
 306         break;                                                                \
 307     case 1:                              /* vertical scaling factor is > 1 */ \
 308         while( (i_scale_count -= p_vout->render.i_height) > 0 )               \
 309         {                                                                     \
 310             p_y -= p_vout->render.i_width;                                    \
 311             p_u -= i_chroma_width;                                            \
 312             p_v -= i_chroma_width;                                            \
 313             SCALE_WIDTH_DITHER( CHROMA );                                     \
 314         }                                                                     \
 315         i_scale_count += p_vout->output.i_height;                             \
 316         break;                                                                \
 317     }                                                                         \
 318