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 1.1 2002/01/04 14:01:34 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 } chroma_sys_t;
  36
  37 /*****************************************************************************
  38  * Prototypes
  39  *****************************************************************************/
  40 #ifdef MODULE_NAME_IS_chroma_i420_rgb
  41 void _M( I420_RGB8 ) ( vout_thread_t *, picture_t *, picture_t * );
  42 #endif
  43 void _M( I420_RGB16 )( vout_thread_t *, picture_t *, picture_t * );
  44 void _M( I420_RGB24 )( vout_thread_t *, picture_t *, picture_t * );
  45 void _M( I420_RGB32 )( vout_thread_t *, picture_t *, picture_t * );
  46
  47 /*****************************************************************************
  48  * CONVERT_*_PIXEL: pixel conversion macros
  49  *****************************************************************************
  50  * These conversion routines are used by YUV conversion functions.
  51  * conversion are made from p_y, p_u, p_v, which are modified, to p_buffer,
  52  * which is also modified. CONVERT_4YUV_PIXEL is used for 8bpp dithering,
  53  * CONVERT_4YUV_PIXEL_SCALE does the same but also scales the output.
  54  *****************************************************************************/
  55 #define CONVERT_Y_PIXEL( BPP )                                                \
  56     /* Only Y sample is present */                                            \
  57     p_ybase = p_yuv + *p_y++;                                                 \
  58     *p_buffer++ = p_ybase[RED_OFFSET-((V_RED_COEF*128)>>SHIFT) + i_red] |     \
  59         p_ybase[GREEN_OFFSET-(((U_GREEN_COEF+V_GREEN_COEF)*128)>>SHIFT)       \
  60         + i_green ] | p_ybase[BLUE_OFFSET-((U_BLUE_COEF*128)>>SHIFT) + i_blue];
  61
  62 #define CONVERT_YUV_PIXEL( BPP )                                              \
  63     /* Y, U and V samples are present */                                      \
  64     i_uval =    *p_u++;                                                       \
  65     i_vval =    *p_v++;                                                       \
  66     i_red =     (V_RED_COEF * i_vval) >> SHIFT;                               \
  67     i_green =   (U_GREEN_COEF * i_uval + V_GREEN_COEF * i_vval) >> SHIFT;     \
  68     i_blue =    (U_BLUE_COEF * i_uval) >> SHIFT;                              \
  69     CONVERT_Y_PIXEL( BPP )                                                    \
  70
  71 #define CONVERT_4YUV_PIXEL( CHROMA )                                          \
  72     *p_pic++ = p_lookup[                                                      \
  73         (((*p_y++ + dither10[i_real_y]) >> 4) << 7)                           \
  74       + ((*p_u + dither20[i_real_y]) >> 5) * 9                                \
  75       + ((*p_v + dither20[i_real_y]) >> 5) ];                                 \
  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_pic++ = p_lookup[                                                      \
  81         (((*p_y++ + dither12[i_real_y]) >> 4) << 7)                           \
  82       + ((*p_u + dither22[i_real_y]) >> 5) * 9                                \
  83       + ((*p_v + dither22[i_real_y]) >> 5) ];                                 \
  84     *p_pic++ = p_lookup[                                                      \
  85         (((*p_y++ + dither13[i_real_y]) >> 4) << 7)                           \
  86       + ((*p_u++ + dither23[i_real_y]) >> 5) * 9                              \
  87       + ((*p_v++ + dither23[i_real_y]) >> 5) ];                               \
  88
  89 #define CONVERT_4YUV_PIXEL_SCALE( CHROMA )                                    \
  90     *p_pic++ = p_lookup[                                                      \
  91         ( ((*p_y + dither10[i_real_y]) >> 4) << 7)                            \
  92         + ((*p_u + dither20[i_real_y]) >> 5) * 9                              \
  93         + ((*p_v + dither20[i_real_y]) >> 5) ];                               \
  94     p_y += *p_offset++;                                                       \
  95     p_u += *p_offset;                                                         \
  96     p_v += *p_offset++;                                                       \
  97     *p_pic++ = p_lookup[                                                      \
  98         ( ((*p_y + dither11[i_real_y]) >> 4) << 7)                            \
  99         + ((*p_u + dither21[i_real_y]) >> 5) * 9                              \
 100         + ((*p_v + dither21[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 + dither12[i_real_y]) >> 4) << 7)                            \
 106         + ((*p_u + dither22[i_real_y]) >> 5) * 9                              \
 107         + ((*p_v + dither22[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 + dither13[i_real_y]) >> 4) << 7)                            \
 113         + ((*p_u + dither23[i_real_y]) >> 5) * 9                              \
 114         + ((*p_v + dither23[i_real_y]) >> 5) ];                               \
 115     p_y += *p_offset++;                                                       \
 116     p_u += *p_offset;                                                         \
 117     p_v += *p_offset++;                                                       \
 118
 119 /*****************************************************************************
 120  * SCALE_WIDTH: scale a line horizontally
 121  *****************************************************************************
 122  * This macro scales a line using rendering buffer and offset array. It works
 123  * for 1, 2 and 4 Bpp.
 124  *****************************************************************************/
 125 #define SCALE_WIDTH                                                           \
 126     if( b_hscale )                                                            \
 127     {                                                                         \
 128         /* Horizontal scaling, conversion has been done to buffer.            \
 129          * Rewind buffer and offset, then copy and scale line */              \
 130         p_buffer = p_buffer_start;                                            \
 131         p_offset = p_offset_start;                                            \
 132         for( i_x = p_vout->output.i_width / 16; i_x--; )                      \
 133         {                                                                     \
 134             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 135             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 136             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 137             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 138             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 139             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 140             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 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         }                                                                     \
 151         for( i_x = p_vout->output.i_width & 15; i_x--; )                      \
 152         {                                                                     \
 153             *p_pic++ = *p_buffer;   p_buffer += *p_offset++;                  \
 154         }                                                                     \
 155         p_pic += i_right_margin;                                              \
 156     }                                                                         \
 157     else                                                                      \
 158     {                                                                         \
 159         /* No scaling, conversion has been done directly in picture memory.   \
 160          * Increment of picture pointer to end of line is still needed */     \
 161         (u8*)p_pic += p_dest->p->i_pitch;                                     \
 162     }                                                                         \
 163
 164 /*****************************************************************************
 165  * SCALE_WIDTH_DITHER: scale a line horizontally for dithered 8 bpp
 166  *****************************************************************************
 167  * This macro scales a line using an offset array.
 168  *****************************************************************************/
 169 #define SCALE_WIDTH_DITHER( CHROMA )                                          \
 170     if( b_hscale )                                                            \
 171     {                                                                         \
 172         /* Horizontal scaling - we can't use a buffer due to dithering */     \
 173         p_offset = p_offset_start;                                            \
 174         for( i_x = p_vout->output.i_width / 16; i_x--; )                      \
 175         {                                                                     \
 176             CONVERT_4YUV_PIXEL_SCALE( CHROMA )                                \
 177             CONVERT_4YUV_PIXEL_SCALE( CHROMA )                                \
 178             CONVERT_4YUV_PIXEL_SCALE( CHROMA )                                \
 179             CONVERT_4YUV_PIXEL_SCALE( CHROMA )                                \
 180         }                                                                     \
 181     }                                                                         \
 182     else                                                                      \
 183     {                                                                         \
 184         for( i_x = p_vout->render.i_width / 16; i_x--;  )                     \
 185         {                                                                     \
 186             CONVERT_4YUV_PIXEL( CHROMA )                                      \
 187             CONVERT_4YUV_PIXEL( CHROMA )                                      \
 188             CONVERT_4YUV_PIXEL( CHROMA )                                      \
 189             CONVERT_4YUV_PIXEL( CHROMA )                                      \
 190         }                                                                     \
 191     }                                                                         \
 192     /* Increment of picture pointer to end of line is still needed */         \
 193     p_pic += i_right_margin;                                                  \
 194                                                                               \
 195     /* Increment the Y coordinate in the matrix, modulo 4 */                  \
 196     i_real_y = (i_real_y + 1) & 0x3;                                          \
 197
 198 /*****************************************************************************
 199  * SCALE_HEIGHT: handle vertical scaling
 200  *****************************************************************************
 201  * This macro handle vertical scaling for a picture. CHROMA may be 420, 422 or
 202  * 444 for RGB conversion, or 400 for gray conversion. It works for 1, 2, 3
 203  * and 4 Bpp.
 204  *****************************************************************************/
 205 #define SCALE_HEIGHT( CHROMA, BPP )                                           \
 206     /* If line is odd, rewind 4:2:0 U and V samples */                        \
 207     if( ((CHROMA == 420) || (CHROMA == 422)) && !(i_y & 0x1) )                \
 208     {                                                                         \
 209         p_u -= i_chroma_width;                                                \
 210         p_v -= i_chroma_width;                                                \
 211     }                                                                         \
 212                                                                               \
 213     /*                                                                        \
 214      * Handle vertical scaling. The current line can be copied or next one    \
 215      * can be ignored.                                                        \
 216      */                                                                       \
 217     switch( i_vscale )                                                        \
 218     {                                                                         \
 219     case -1:                             /* vertical scaling factor is < 1 */ \
 220         while( (i_scale_count -= p_vout->output.i_height) > 0 )               \
 221         {                                                                     \
 222             /* Height reduction: skip next source line */                     \
 223             p_y += p_vout->render.i_width;                                    \
 224             i_y++;                                                            \
 225             if( (CHROMA == 420) || (CHROMA == 422) )                          \
 226             {                                                                 \
 227                 if( i_y & 0x1 )                                               \
 228                 {                                                             \
 229                     p_u += i_chroma_width;                                    \
 230                     p_v += i_chroma_width;                                    \
 231                 }                                                             \
 232             }                                                                 \
 233             else if( CHROMA == 444 )                                          \
 234             {                                                                 \
 235                 p_u += p_vout->render.i_width;                                \
 236                 p_v += p_vout->render.i_width;                                \
 237             }                                                                 \
 238         }                                                                     \
 239         i_scale_count += p_vout->render.i_height;                             \
 240         break;                                                                \
 241     case 1:                              /* vertical scaling factor is > 1 */ \
 242         while( (i_scale_count -= p_vout->render.i_height) > 0 )               \
 243         {                                                                     \
 244             /* Height increment: copy previous picture line */                \
 245             FAST_MEMCPY( p_pic, p_pic_start, p_vout->output.i_width * BPP );  \
 246             (u8*)p_pic += p_dest->p->i_pitch;                                 \
 247         }                                                                     \
 248         i_scale_count += p_vout->output.i_height;                             \
 249         break;                                                                \
 250     }                                                                         \
 251
 252 /*****************************************************************************
 253  * SCALE_HEIGHT_DITHER: handle vertical scaling for dithered 8 bpp
 254  *****************************************************************************
 255  * This macro handles vertical scaling for a picture. CHROMA may be 420,
 256  * 422 or 444 for RGB conversion, or 400 for gray conversion.
 257  *****************************************************************************/
 258 #define SCALE_HEIGHT_DITHER( CHROMA )                                         \
 259                                                                               \
 260     /* If line is odd, rewind 4:2:0 U and V samples */                        \
 261     if( ((CHROMA == 420) || (CHROMA == 422)) && !(i_y & 0x1) )                \
 262     {                                                                         \
 263         p_u -= i_chroma_width;                                                \
 264         p_v -= i_chroma_width;                                                \
 265     }                                                                         \
 266                                                                               \
 267     /*                                                                        \
 268      * Handle vertical scaling. The current line can be copied or next one    \
 269      * can be ignored.                                                        \
 270      */                                                                       \
 271                                                                               \
 272     switch( i_vscale )                                                        \
 273     {                                                                         \
 274     case -1:                             /* vertical scaling factor is < 1 */ \
 275         while( (i_scale_count -= p_vout->output.i_height) > 0 )               \
 276         {                                                                     \
 277             /* Height reduction: skip next source line */                     \
 278             p_y += p_vout->render.i_width;                                    \
 279             i_y++;                                                            \
 280             if( (CHROMA == 420) || (CHROMA == 422) )                          \
 281             {                                                                 \
 282                 if( i_y & 0x1 )                                               \
 283                 {                                                             \
 284                     p_u += i_chroma_width;                                    \
 285                     p_v += i_chroma_width;                                    \
 286                 }                                                             \
 287             }                                                                 \
 288             else if( CHROMA == 444 )                                          \
 289             {                                                                 \
 290                 p_u += p_vout->render.i_width;                                \
 291                 p_v += p_vout->render.i_width;                                \
 292             }                                                                 \
 293         }                                                                     \
 294         i_scale_count += p_vout->render.i_height;                             \
 295         break;                                                                \
 296     case 1:                              /* vertical scaling factor is > 1 */ \
 297         while( (i_scale_count -= p_vout->render.i_height) > 0 )               \
 298         {                                                                     \
 299             p_y -= p_vout->render.i_width;                                    \
 300             p_u -= i_chroma_width;                                            \
 301             p_v -= i_chroma_width;                                            \
 302             SCALE_WIDTH_DITHER( CHROMA );                                     \
 303         }                                                                     \
 304         i_scale_count += p_vout->output.i_height;                             \
 305         break;                                                                \
 306     }                                                                         \
 307