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, 2004 the VideoLAN team
   5  * $Id$
   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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 /** Number of entries in RGB palette/colormap */
  25 #define CMAP_RGB2_SIZE 256
  26
  27 /**
  28  * chroma_sys_t: chroma method descriptor
  29
  30  * This structure is part of the chroma transformation descriptor, it
  31  * describes the yuv2rgb specific properties.
  32  */
  33 struct chroma_sys_t
  34 {
  35     uint8_t  *p_buffer;
  36     int *p_offset;
  37
  38 #ifdef MODULE_NAME_IS_i420_rgb
  39     /**< Pre-calculated conversion tables */
  40     void *p_base;                      /**< base for all conversion tables */
  41     uint8_t   *p_rgb8;                 /**< RGB 8 bits table */
  42     uint16_t  *p_rgb16;                /**< RGB 16 bits table */
  43     uint32_t  *p_rgb32;                /**< RGB 32 bits table */
  44
  45     /**< To get RGB value for palette entry i, use (p_rgb_r[i], p_rgb_g[i],
  46        p_rgb_b[i]). Note these are 16 bits per pixel. For 8bpp entries,
  47        shift right 8 bits.
  48     */
  49     uint16_t  p_rgb_r[CMAP_RGB2_SIZE];  /**< Red values of palette */
  50     uint16_t  p_rgb_g[CMAP_RGB2_SIZE];  /**< Green values of palette */
  51     uint16_t  p_rgb_b[CMAP_RGB2_SIZE];  /**< Blue values of palette */
  52 #endif
  53 };
  54
  55 /*****************************************************************************
  56  * Prototypes
  57  *****************************************************************************/
  58 #ifdef MODULE_NAME_IS_i420_rgb
  59 void E_(I420_RGB8)         ( vout_thread_t *, picture_t *, picture_t * );
  60 void E_(I420_RGB16_dither) ( vout_thread_t *, picture_t *, picture_t * );
  61 void E_(I420_RGB16)        ( vout_thread_t *, picture_t *, picture_t * );
  62 void E_(I420_RGB32)        ( vout_thread_t *, picture_t *, picture_t * );
  63 #else // if defined(MODULE_NAME_IS_i420_rgb_mmx)
  64 void E_(I420_R5G5B5)       ( vout_thread_t *, picture_t *, picture_t * );
  65 void E_(I420_R5G6B5)       ( vout_thread_t *, picture_t *, picture_t * );
  66 void E_(I420_A8R8G8B8)     ( vout_thread_t *, picture_t *, picture_t * );
  67 void E_(I420_B8G8R8A8)     ( vout_thread_t *, picture_t *, picture_t * );
  68 #endif
  69
  70 /*****************************************************************************
  71  * CONVERT_*_PIXEL: pixel conversion macros
  72  *****************************************************************************
  73  * These conversion routines are used by YUV conversion functions.
  74  * conversion are made from p_y, p_u, p_v, which are modified, to p_buffer,
  75  * which is also modified. CONVERT_4YUV_PIXEL is used for 8bpp dithering,
  76  * CONVERT_4YUV_PIXEL_SCALE does the same but also scales the output.
  77  *****************************************************************************/
  78 #define CONVERT_Y_PIXEL( BPP )                                                \
  79     /* Only Y sample is present */                                            \
  80     p_ybase = p_yuv + *p_y++;                                                 \
  81     *p_buffer++ = p_ybase[RED_OFFSET-((V_RED_COEF*128)>>SHIFT) + i_red] |     \
  82         p_ybase[GREEN_OFFSET-(((U_GREEN_COEF+V_GREEN_COEF)*128)>>SHIFT)       \
  83         + i_green ] | p_ybase[BLUE_OFFSET-((U_BLUE_COEF*128)>>SHIFT) + i_blue];
  84
  85 #define CONVERT_YUV_PIXEL( BPP )                                              \
  86     /* Y, U and V samples are present */                                      \
  87     i_uval =    *p_u++;                                                       \
  88     i_vval =    *p_v++;                                                       \
  89     i_red =     (V_RED_COEF * i_vval) >> SHIFT;                               \
  90     i_green =   (U_GREEN_COEF * i_uval + V_GREEN_COEF * i_vval) >> SHIFT;     \
  91     i_blue =    (U_BLUE_COEF * i_uval) >> SHIFT;                              \
  92     CONVERT_Y_PIXEL( BPP )                                                    \
  93
  94 #define CONVERT_Y_PIXEL_DITHER( BPP )                                         \
  95     /* Only Y sample is present */                                            \
  96     p_ybase = p_yuv + *p_y++;                                                 \
  97     *p_buffer++ = p_ybase[RED_OFFSET-((V_RED_COEF*128+p_dither[i_real_y])>>SHIFT) + i_red] |     \
  98         p_ybase[GREEN_OFFSET-(((U_GREEN_COEF+V_GREEN_COEF)*128+p_dither[i_real_y])>>SHIFT)       \
  99         + i_green ] | p_ybase[BLUE_OFFSET-((U_BLUE_COEF*128+p_dither[i_real_y])>>SHIFT) + i_blue];
 100
 101 #define CONVERT_YUV_PIXEL_DITHER( BPP )                                       \
 102     /* Y, U and V samples are present */                                      \
 103     i_uval =    *p_u++;                                                       \
 104     i_vval =    *p_v++;                                                       \
 105     i_red =     (V_RED_COEF * i_vval) >> SHIFT;                               \
 106     i_green =   (U_GREEN_COEF * i_uval + V_GREEN_COEF * i_vval) >> SHIFT;     \
 107     i_blue =    (U_BLUE_COEF * i_uval) >> SHIFT;                              \
 108     CONVERT_Y_PIXEL_DITHER( BPP )                                             \
 109
 110 #define CONVERT_4YUV_PIXEL( CHROMA )                                          \
 111     *p_pic++ = p_lookup[                                                      \
 112         (((*p_y++ + dither10[i_real_y]) >> 4) << 7)                           \
 113       + ((*p_u + dither20[i_real_y]) >> 5) * 9                                \
 114       + ((*p_v + dither20[i_real_y]) >> 5) ];                                 \
 115     *p_pic++ = p_lookup[                                                      \
 116         (((*p_y++ + dither11[i_real_y]) >> 4) << 7)                           \
 117       + ((*p_u++ + dither21[i_real_y]) >> 5) * 9                              \
 118       + ((*p_v++ + dither21[i_real_y]) >> 5) ];                               \
 119     *p_pic++ = p_lookup[                                                      \
 120         (((*p_y++ + dither12[i_real_y]) >> 4) << 7)                           \
 121       + ((*p_u + dither22[i_real_y]) >> 5) * 9                                \
 122       + ((*p_v + dither22[i_real_y]) >> 5) ];                                 \
 123     *p_pic++ = p_lookup[                                                      \
 124         (((*p_y++ + dither13[i_real_y]) >> 4) << 7)                           \
 125       + ((*p_u++ + dither23[i_real_y]) >> 5) * 9                              \
 126       + ((*p_v++ + dither23[i_real_y]) >> 5) ];                               \
 127
 128 #define CONVERT_4YUV_PIXEL_SCALE( CHROMA )                                    \
 129     *p_pic++ = p_lookup[                                                      \
 130         ( ((*p_y + dither10[i_real_y]) >> 4) << 7)                            \
 131         + ((*p_u + dither20[i_real_y]) >> 5) * 9                              \
 132         + ((*p_v + dither20[i_real_y]) >> 5) ];                               \
 133     p_y += *p_offset++;                                                       \
 134     p_u += *p_offset;                                                         \
 135     p_v += *p_offset++;                                                       \
 136     *p_pic++ = p_lookup[                                                      \
 137         ( ((*p_y + dither11[i_real_y]) >> 4) << 7)                            \
 138         + ((*p_u + dither21[i_real_y]) >> 5) * 9                              \
 139         + ((*p_v + dither21[i_real_y]) >> 5) ];                               \
 140     p_y += *p_offset++;                                                       \
 141     p_u += *p_offset;                                                         \
 142     p_v += *p_offset++;                                                       \
 143     *p_pic++ = p_lookup[                                                      \
 144         ( ((*p_y + dither12[i_real_y]) >> 4) << 7)                            \
 145         + ((*p_u + dither22[i_real_y]) >> 5) * 9                              \
 146         + ((*p_v + dither22[i_real_y]) >> 5) ];                               \
 147     p_y += *p_offset++;                                                       \
 148     p_u += *p_offset;                                                         \
 149     p_v += *p_offset++;                                                       \
 150     *p_pic++ = p_lookup[                                                      \
 151         ( ((*p_y + dither13[i_real_y]) >> 4) << 7)                            \
 152         + ((*p_u + dither23[i_real_y]) >> 5) * 9                              \
 153         + ((*p_v + dither23[i_real_y]) >> 5) ];                               \
 154     p_y += *p_offset++;                                                       \
 155     p_u += *p_offset;                                                         \
 156     p_v += *p_offset++;                                                       \
 157
 158 /*****************************************************************************
 159  * SCALE_WIDTH: scale a line horizontally
 160  *****************************************************************************
 161  * This macro scales a line using rendering buffer and offset array. It works
 162  * for 1, 2 and 4 Bpp.
 163  *****************************************************************************/
 164 #define SCALE_WIDTH                                                           \
 165     if( b_hscale )                                                            \
 166     {                                                                         \
 167         /* Horizontal scaling, conversion has been done to buffer.            \
 168          * Rewind buffer and offset, then copy and scale line */              \
 169         p_buffer = p_buffer_start;                                            \
 170         p_offset = p_offset_start;                                            \
 171         for( i_x = p_vout->output.i_width / 16; i_x--; )                      \
 172         {                                                                     \
 173             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 174             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 175             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 176             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 177             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 178             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 179             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 180             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 181             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 182             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 183             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 184             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 185             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 186             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 187             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 188             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 189         }                                                                     \
 190         for( i_x = p_vout->output.i_width & 15; i_x--; )                      \
 191         {                                                                     \
 192             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 193         }                                                                     \
 194         p_pic = (void*)((uint8_t*)p_pic + i_right_margin );                   \
 195     }                                                                         \
 196     else                                                                      \
 197     {                                                                         \
 198         /* No scaling, conversion has been done directly in picture memory.   \
 199          * Increment of picture pointer to end of line is still needed */     \
 200         p_pic = (void*)((uint8_t*)p_pic + p_dest->p->i_pitch );               \
 201     }                                                                         \
 202
 203 /*****************************************************************************
 204  * SCALE_WIDTH_DITHER: scale a line horizontally for dithered 8 bpp
 205  *****************************************************************************
 206  * This macro scales a line using an offset array.
 207  *****************************************************************************/
 208 #define SCALE_WIDTH_DITHER( CHROMA )                                          \
 209     if( b_hscale )                                                            \
 210     {                                                                         \
 211         /* Horizontal scaling - we can't use a buffer due to dithering */     \
 212         p_offset = p_offset_start;                                            \
 213         for( i_x = p_vout->output.i_width / 16; i_x--; )                      \
 214         {                                                                     \
 215             CONVERT_4YUV_PIXEL_SCALE( CHROMA )                                \
 216             CONVERT_4YUV_PIXEL_SCALE( CHROMA )                                \
 217             CONVERT_4YUV_PIXEL_SCALE( CHROMA )                                \
 218             CONVERT_4YUV_PIXEL_SCALE( CHROMA )                                \
 219         }                                                                     \
 220     }                                                                         \
 221     else                                                                      \
 222     {                                                                         \
 223         for( i_x = p_vout->render.i_width / 16; i_x--;  )                     \
 224         {                                                                     \
 225             CONVERT_4YUV_PIXEL( CHROMA )                                      \
 226             CONVERT_4YUV_PIXEL( CHROMA )                                      \
 227             CONVERT_4YUV_PIXEL( CHROMA )                                      \
 228             CONVERT_4YUV_PIXEL( CHROMA )                                      \
 229         }                                                                     \
 230     }                                                                         \
 231     /* Increment of picture pointer to end of line is still needed */         \
 232     p_pic = (void*)((uint8_t*)p_pic + i_right_margin );                       \
 233                                                                               \
 234     /* Increment the Y coordinate in the matrix, modulo 4 */                  \
 235     i_real_y = (i_real_y + 1) & 0x3;                                          \
 236
 237 /*****************************************************************************
 238  * SCALE_HEIGHT: handle vertical scaling
 239  *****************************************************************************
 240  * This macro handle vertical scaling for a picture. CHROMA may be 420, 422 or
 241  * 444 for RGB conversion, or 400 for gray conversion. It works for 1, 2, 3
 242  * and 4 Bpp.
 243  *****************************************************************************/
 244 #define SCALE_HEIGHT( CHROMA, BPP )                                           \
 245     /* If line is odd, rewind 4:2:0 U and V samples */                        \
 246     if( ((CHROMA == 420) || (CHROMA == 422)) && !(i_y & 0x1) )                \
 247     {                                                                         \
 248         p_u -= i_chroma_width;                                                \
 249         p_v -= i_chroma_width;                                                \
 250     }                                                                         \
 251                                                                               \
 252     /*                                                                        \
 253      * Handle vertical scaling. The current line can be copied or next one    \
 254      * can be ignored.                                                        \
 255      */                                                                       \
 256     switch( i_vscale )                                                        \
 257     {                                                                         \
 258     case -1:                             /* vertical scaling factor is < 1 */ \
 259         while( (i_scale_count -= p_vout->output.i_height) > 0 )               \
 260         {                                                                     \
 261             /* Height reduction: skip next source line */                     \
 262             p_y += p_vout->render.i_width;                                    \
 263             i_y++;                                                            \
 264             if( (CHROMA == 420) || (CHROMA == 422) )                          \
 265             {                                                                 \
 266                 if( i_y & 0x1 )                                               \
 267                 {                                                             \
 268                     p_u += i_chroma_width;                                    \
 269                     p_v += i_chroma_width;                                    \
 270                 }                                                             \
 271             }                                                                 \
 272             else if( CHROMA == 444 )                                          \
 273             {                                                                 \
 274                 p_u += p_vout->render.i_width;                                \
 275                 p_v += p_vout->render.i_width;                                \
 276             }                                                                 \
 277         }                                                                     \
 278         i_scale_count += p_vout->render.i_height;                             \
 279         break;                                                                \
 280     case 1:                              /* vertical scaling factor is > 1 */ \
 281         while( (i_scale_count -= p_vout->render.i_height) > 0 )               \
 282         {                                                                     \
 283             /* Height increment: copy previous picture line */                \
 284             p_vout->p_libvlc->pf_memcpy( p_pic, p_pic_start,                     \
 285                                       p_vout->output.i_width * BPP );         \
 286             p_pic = (void*)((uint8_t*)p_pic + p_dest->p->i_pitch );           \
 287         }                                                                     \
 288         i_scale_count += p_vout->output.i_height;                             \
 289         break;                                                                \
 290     }                                                                         \
 291
 292 /*****************************************************************************
 293  * SCALE_HEIGHT_DITHER: handle vertical scaling for dithered 8 bpp
 294  *****************************************************************************
 295  * This macro handles vertical scaling for a picture. CHROMA may be 420,
 296  * 422 or 444 for RGB conversion, or 400 for gray conversion.
 297  *****************************************************************************/
 298 #define SCALE_HEIGHT_DITHER( CHROMA )                                         \
 299                                                                               \
 300     /* If line is odd, rewind 4:2:0 U and V samples */                        \
 301     if( ((CHROMA == 420) || (CHROMA == 422)) && !(i_y & 0x1) )                \
 302     {                                                                         \
 303         p_u -= i_chroma_width;                                                \
 304         p_v -= i_chroma_width;                                                \
 305     }                                                                         \
 306                                                                               \
 307     /*                                                                        \
 308      * Handle vertical scaling. The current line can be copied or next one    \
 309      * can be ignored.                                                        \
 310      */                                                                       \
 311                                                                               \
 312     switch( i_vscale )                                                        \
 313     {                                                                         \
 314     case -1:                             /* vertical scaling factor is < 1 */ \
 315         while( (i_scale_count -= p_vout->output.i_height) > 0 )               \
 316         {                                                                     \
 317             /* Height reduction: skip next source line */                     \
 318             p_y += p_vout->render.i_width;                                    \
 319             i_y++;                                                            \
 320             if( (CHROMA == 420) || (CHROMA == 422) )                          \
 321             {                                                                 \
 322                 if( i_y & 0x1 )                                               \
 323                 {                                                             \
 324                     p_u += i_chroma_width;                                    \
 325                     p_v += i_chroma_width;                                    \
 326                 }                                                             \
 327             }                                                                 \
 328             else if( CHROMA == 444 )                                          \
 329             {                                                                 \
 330                 p_u += p_vout->render.i_width;                                \
 331                 p_v += p_vout->render.i_width;                                \
 332             }                                                                 \
 333         }                                                                     \
 334         i_scale_count += p_vout->render.i_height;                             \
 335         break;                                                                \
 336     case 1:                              /* vertical scaling factor is > 1 */ \
 337         while( (i_scale_count -= p_vout->render.i_height) > 0 )               \
 338         {                                                                     \
 339             p_y -= p_vout->render.i_width;                                    \
 340             p_u -= i_chroma_width;                                            \
 341             p_v -= i_chroma_width;                                            \
 342             SCALE_WIDTH_DITHER( CHROMA );                                     \
 343         }                                                                     \
 344         i_scale_count += p_vout->output.i_height;                             \
 345         break;                                                                \
 346     }                                                                         \
 347