git.sesse.net Git - vlc/blob - modules/video_filter/blend.c

   1 /*****************************************************************************
   2  * blend.c: alpha blend 2 pictures together
   3  *****************************************************************************
   4  * Copyright (C) 2003 the VideoLAN team
   5  * $Id$
   6  *
   7  * Author: Gildas Bazin <gbazin@videolan.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  * Preamble
  26  *****************************************************************************/
  27 #include <vlc/vlc.h>
  28 #include <vlc/decoder.h>
  29 #include "vlc_filter.h"
  30
  31 /*****************************************************************************
  32  * filter_sys_t : filter descriptor
  33  *****************************************************************************/
  34 struct filter_sys_t
  35 {
  36     int i_dummy;
  37 };
  38
  39 /****************************************************************************
  40  * Local prototypes
  41  ****************************************************************************/
  42 static int  OpenFilter ( vlc_object_t * );
  43 static void CloseFilter( vlc_object_t * );
  44
  45 /* TODO i_alpha support for BlendR16 */
  46 static void Blend( filter_t *, picture_t *, picture_t *, picture_t *,
  47                    int, int, int );
  48 static void BlendI420( filter_t *, picture_t *, picture_t *, picture_t *,
  49                        int, int, int, int, int );
  50 static void BlendR16( filter_t *, picture_t *, picture_t *, picture_t *,
  51                       int, int, int, int, int );
  52 static void BlendR24( filter_t *, picture_t *, picture_t *, picture_t *,
  53                       int, int, int, int, int );
  54 static void BlendYUY2( filter_t *, picture_t *, picture_t *, picture_t *,
  55                        int, int, int, int, int );
  56 static void BlendPalI420( filter_t *, picture_t *, picture_t *, picture_t *,
  57                           int, int, int, int, int );
  58 static void BlendPalYUY2( filter_t *, picture_t *, picture_t *, picture_t *,
  59                           int, int, int, int, int );
  60 static void BlendPalRV( filter_t *, picture_t *, picture_t *, picture_t *,
  61                         int, int, int, int, int );
  62
  63 /*****************************************************************************
  64  * Module descriptor
  65  *****************************************************************************/
  66 vlc_module_begin();
  67     set_description( _("Video pictures blending") );
  68     set_capability( "video blending", 100 );
  69     set_callbacks( OpenFilter, CloseFilter );
  70 vlc_module_end();
  71
  72 /*****************************************************************************
  73  * OpenFilter: probe the filter and return score
  74  *****************************************************************************/
  75 static int OpenFilter( vlc_object_t *p_this )
  76 {
  77     filter_t *p_filter = (filter_t*)p_this;
  78     filter_sys_t *p_sys;
  79
  80     /* Check if we can handle that format.
  81      * We could try to use a chroma filter if we can't. */
  82     if( ( p_filter->fmt_in.video.i_chroma != VLC_FOURCC('Y','U','V','A') &&
  83           p_filter->fmt_in.video.i_chroma != VLC_FOURCC('Y','U','V','P') ) ||
  84         ( p_filter->fmt_out.video.i_chroma != VLC_FOURCC('I','4','2','0') &&
  85           p_filter->fmt_out.video.i_chroma != VLC_FOURCC('Y','U','Y','2') &&
  86           p_filter->fmt_out.video.i_chroma != VLC_FOURCC('Y','V','1','2') &&
  87           p_filter->fmt_out.video.i_chroma != VLC_FOURCC('R','V','1','6') &&
  88           p_filter->fmt_out.video.i_chroma != VLC_FOURCC('R','V','2','4') &&
  89           p_filter->fmt_out.video.i_chroma != VLC_FOURCC('R','V','3','2') ) )
  90     {
  91         return VLC_EGENERIC;
  92     }
  93
  94     /* Allocate the memory needed to store the decoder's structure */
  95     if( ( p_filter->p_sys = p_sys =
  96           (filter_sys_t *)malloc(sizeof(filter_sys_t)) ) == NULL )
  97     {
  98         msg_Err( p_filter, "out of memory" );
  99         return VLC_EGENERIC;
 100     }
 101
 102     /* Misc init */
 103     p_filter->pf_video_blend = Blend;
 104
 105     msg_Dbg( p_filter, "chroma: %4.4s -> %4.4s",
 106              (char *)&p_filter->fmt_in.video.i_chroma,
 107              (char *)&p_filter->fmt_out.video.i_chroma );
 108
 109
 110     return VLC_SUCCESS;
 111 }
 112
 113 /****************************************************************************
 114  * Blend: the whole thing
 115  ****************************************************************************
 116  * This function is called just after the thread is launched.
 117  ****************************************************************************/
 118 static void Blend( filter_t *p_filter, picture_t *p_dst,
 119                    picture_t *p_dst_orig, picture_t *p_src,
 120                    int i_x_offset, int i_y_offset, int i_alpha )
 121 {
 122     int i_width, i_height;
 123
 124     i_width = __MIN((int)p_filter->fmt_out.video.i_visible_width - i_x_offset,
 125                     (int)p_filter->fmt_in.video.i_visible_width);
 126
 127     i_height = __MIN((int)p_filter->fmt_out.video.i_visible_height -i_y_offset,
 128                      (int)p_filter->fmt_in.video.i_visible_height);
 129
 130     if( i_width <= 0 || i_height <= 0 ) return;
 131
 132     if( p_filter->fmt_in.video.i_chroma == VLC_FOURCC('Y','U','V','A') &&
 133         ( p_filter->fmt_out.video.i_chroma == VLC_FOURCC('I','4','2','0') ||
 134           p_filter->fmt_out.video.i_chroma == VLC_FOURCC('Y','V','1','2') ) )
 135     {
 136         BlendI420( p_filter, p_dst, p_dst_orig, p_src,
 137                    i_x_offset, i_y_offset, i_width, i_height, i_alpha );
 138         return;
 139     }
 140     if( p_filter->fmt_in.video.i_chroma == VLC_FOURCC('Y','U','V','A') &&
 141         p_filter->fmt_out.video.i_chroma == VLC_FOURCC('Y','U','Y','2') )
 142     {
 143         BlendYUY2( p_filter, p_dst, p_dst_orig, p_src,
 144                    i_x_offset, i_y_offset, i_width, i_height, i_alpha );
 145         return;
 146     }
 147     if( p_filter->fmt_in.video.i_chroma == VLC_FOURCC('Y','U','V','A') &&
 148         p_filter->fmt_out.video.i_chroma == VLC_FOURCC('R','V','1','6') )
 149     {
 150         BlendR16( p_filter, p_dst, p_dst_orig, p_src,
 151                   i_x_offset, i_y_offset, i_width, i_height, i_alpha );
 152         return;
 153     }
 154     if( p_filter->fmt_in.video.i_chroma == VLC_FOURCC('Y','U','V','A') &&
 155         ( p_filter->fmt_out.video.i_chroma == VLC_FOURCC('R','V','2','4') ||
 156           p_filter->fmt_out.video.i_chroma == VLC_FOURCC('R','V','3','2') ) )
 157     {
 158         BlendR24( p_filter, p_dst, p_dst_orig, p_src,
 159                   i_x_offset, i_y_offset, i_width, i_height, i_alpha );
 160         return;
 161     }
 162     if( p_filter->fmt_in.video.i_chroma == VLC_FOURCC('Y','U','V','P') &&
 163         ( p_filter->fmt_out.video.i_chroma == VLC_FOURCC('I','4','2','0') ||
 164           p_filter->fmt_out.video.i_chroma == VLC_FOURCC('Y','V','1','2') ) )
 165     {
 166         BlendPalI420( p_filter, p_dst, p_dst_orig, p_src,
 167                       i_x_offset, i_y_offset, i_width, i_height, i_alpha );
 168         return;
 169     }
 170     if( p_filter->fmt_in.video.i_chroma == VLC_FOURCC('Y','U','V','P') &&
 171         p_filter->fmt_out.video.i_chroma == VLC_FOURCC('Y','U','Y','2') )
 172     {
 173         BlendPalYUY2( p_filter, p_dst, p_dst_orig, p_src,
 174                       i_x_offset, i_y_offset, i_width, i_height, i_alpha );
 175         return;
 176     }
 177     if( p_filter->fmt_in.video.i_chroma == VLC_FOURCC('Y','U','V','P') &&
 178         ( p_filter->fmt_out.video.i_chroma == VLC_FOURCC('R','V','1','6') ||
 179           p_filter->fmt_out.video.i_chroma == VLC_FOURCC('R','V','2','4') ||
 180           p_filter->fmt_out.video.i_chroma == VLC_FOURCC('R','V','3','2') ) )
 181     {
 182         BlendPalRV( p_filter, p_dst, p_dst_orig, p_src,
 183                     i_x_offset, i_y_offset, i_width, i_height, i_alpha );
 184         return;
 185     }
 186
 187     msg_Dbg( p_filter, "no matching alpha blending routine" );
 188 }
 189
 190 static void BlendI420( filter_t *p_filter, picture_t *p_dst,
 191                        picture_t *p_dst_orig, picture_t *p_src,
 192                        int i_x_offset, int i_y_offset,
 193                        int i_width, int i_height, int i_alpha )
 194 {
 195     int i_src1_pitch, i_src2_pitch, i_dst_pitch;
 196     uint8_t *p_src1_y, *p_src2_y, *p_dst_y;
 197     uint8_t *p_src1_u, *p_src2_u, *p_dst_u;
 198     uint8_t *p_src1_v, *p_src2_v, *p_dst_v;
 199     uint8_t *p_trans;
 200     int i_x, i_y, i_trans;
 201     vlc_bool_t b_even_scanline = i_y_offset % 2;
 202
 203     i_dst_pitch = p_dst->p[Y_PLANE].i_pitch;
 204     p_dst_y = p_dst->p[Y_PLANE].p_pixels + i_x_offset +
 205               p_filter->fmt_out.video.i_x_offset +
 206               p_dst->p[Y_PLANE].i_pitch *
 207               ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 208     p_dst_u = p_dst->p[U_PLANE].p_pixels + i_x_offset/2 +
 209               p_filter->fmt_out.video.i_x_offset/2 +
 210               ( i_y_offset + p_filter->fmt_out.video.i_y_offset ) / 2 *
 211               p_dst->p[U_PLANE].i_pitch;
 212     p_dst_v = p_dst->p[V_PLANE].p_pixels + i_x_offset/2 +
 213               p_filter->fmt_out.video.i_x_offset/2 +
 214               ( i_y_offset + p_filter->fmt_out.video.i_y_offset ) / 2 *
 215               p_dst->p[V_PLANE].i_pitch;
 216
 217     i_src1_pitch = p_dst_orig->p[Y_PLANE].i_pitch;
 218     p_src1_y = p_dst_orig->p[Y_PLANE].p_pixels + i_x_offset +
 219                p_filter->fmt_out.video.i_x_offset +
 220                p_dst_orig->p[Y_PLANE].i_pitch *
 221                ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 222     p_src1_u = p_dst_orig->p[U_PLANE].p_pixels + i_x_offset/2 +
 223                p_filter->fmt_out.video.i_x_offset/2 +
 224                ( i_y_offset + p_filter->fmt_out.video.i_y_offset ) / 2 *
 225                p_dst_orig->p[U_PLANE].i_pitch;
 226     p_src1_v = p_dst_orig->p[V_PLANE].p_pixels + i_x_offset/2 +
 227                p_filter->fmt_out.video.i_x_offset/2 +
 228                ( i_y_offset + p_filter->fmt_out.video.i_y_offset ) / 2 *
 229                p_dst_orig->p[V_PLANE].i_pitch;
 230
 231     i_src2_pitch = p_src->p[Y_PLANE].i_pitch;
 232     p_src2_y = p_src->p[Y_PLANE].p_pixels +
 233                p_filter->fmt_in.video.i_x_offset +
 234                p_src->p[Y_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset;
 235     p_src2_u = p_src->p[U_PLANE].p_pixels +
 236                p_filter->fmt_in.video.i_x_offset/2 +
 237                p_src->p[U_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset/2;
 238     p_src2_v = p_src->p[V_PLANE].p_pixels +
 239                p_filter->fmt_in.video.i_x_offset/2 +
 240                p_src->p[V_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset/2;
 241
 242     p_trans = p_src->p[A_PLANE].p_pixels +
 243               p_filter->fmt_in.video.i_x_offset +
 244               p_src->p[A_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset;
 245
 246 #define MAX_TRANS 255
 247 #define TRANS_BITS  8
 248
 249     /* Draw until we reach the bottom of the subtitle */
 250     for( i_y = 0; i_y < i_height; i_y++, p_trans += i_src2_pitch,
 251          p_dst_y += i_dst_pitch, p_src1_y += i_src1_pitch,
 252          p_src2_y += i_src2_pitch,
 253          p_dst_u += b_even_scanline ? i_dst_pitch/2 : 0,
 254          p_src1_u += b_even_scanline ? i_src1_pitch/2 : 0,
 255          p_src2_u += i_src2_pitch,
 256          p_dst_v += b_even_scanline ? i_dst_pitch/2 : 0,
 257          p_src1_v += b_even_scanline ? i_src1_pitch/2 : 0,
 258          p_src2_v += i_src2_pitch )
 259     {
 260         b_even_scanline = !b_even_scanline;
 261
 262         /* Draw until we reach the end of the line */
 263         for( i_x = 0; i_x < i_width; i_x++ )
 264         {
 265             i_trans = ( p_trans[i_x] * i_alpha ) / 255;
 266             if( !i_trans )
 267             {
 268                 /* Completely transparent. Don't change pixel */
 269                 continue;
 270             }
 271             else if( i_trans == MAX_TRANS )
 272             {
 273                 /* Completely opaque. Completely overwrite underlying pixel */
 274                 p_dst_y[i_x] = p_src2_y[i_x];
 275
 276                 if( b_even_scanline && i_x % 2 == 0 )
 277                 {
 278                     p_dst_u[i_x/2] = p_src2_u[i_x];
 279                     p_dst_v[i_x/2] = p_src2_v[i_x];
 280                 }
 281                 continue;
 282             }
 283
 284             /* Blending */
 285             p_dst_y[i_x] = ( (uint16_t)p_src2_y[i_x] * i_trans +
 286                 (uint16_t)p_src1_y[i_x] * (MAX_TRANS - i_trans) )
 287                 >> TRANS_BITS;
 288
 289             if( b_even_scanline && i_x % 2 == 0 )
 290             {
 291                 p_dst_u[i_x/2] = ( (uint16_t)p_src2_u[i_x] * i_trans +
 292                 (uint16_t)p_src1_u[i_x/2] * (MAX_TRANS - i_trans) )
 293                 >> TRANS_BITS;
 294                 p_dst_v[i_x/2] = ( (uint16_t)p_src2_v[i_x] * i_trans +
 295                 (uint16_t)p_src1_v[i_x/2] * (MAX_TRANS - i_trans) )
 296                 >> TRANS_BITS;
 297             }
 298         }
 299     }
 300
 301 #undef MAX_TRANS
 302 #undef TRANS_BITS
 303
 304     return;
 305 }
 306
 307 static inline void yuv_to_rgb( int *r, int *g, int *b,
 308                                uint8_t y1, uint8_t u1, uint8_t v1 )
 309 {
 310     /* macros used for YUV pixel conversions */
 311 #   define SCALEBITS 10
 312 #   define ONE_HALF  (1 << (SCALEBITS - 1))
 313 #   define FIX(x)    ((int) ((x) * (1<<SCALEBITS) + 0.5))
 314 #   define CLAMP( x ) (((x) > 255) ? 255 : ((x) < 0) ? 0 : (x));
 315
 316     int y, cb, cr, r_add, g_add, b_add;
 317
 318     cb = u1 - 128;
 319     cr = v1 - 128;
 320     r_add = FIX(1.40200*255.0/224.0) * cr + ONE_HALF;
 321     g_add = - FIX(0.34414*255.0/224.0) * cb
 322             - FIX(0.71414*255.0/224.0) * cr + ONE_HALF;
 323     b_add = FIX(1.77200*255.0/224.0) * cb + ONE_HALF;
 324     y = (y1 - 16) * FIX(255.0/219.0);
 325     *r = CLAMP((y + r_add) >> SCALEBITS);
 326     *g = CLAMP((y + g_add) >> SCALEBITS);
 327     *b = CLAMP((y + b_add) >> SCALEBITS);
 328 }
 329
 330 static void BlendR16( filter_t *p_filter, picture_t *p_dst_pic,
 331                       picture_t *p_dst_orig, picture_t *p_src,
 332                       int i_x_offset, int i_y_offset,
 333                       int i_width, int i_height, int i_alpha )
 334 {
 335     int i_src1_pitch, i_src2_pitch, i_dst_pitch;
 336     uint8_t *p_dst, *p_src1, *p_src2_y;
 337     uint8_t *p_src2_u, *p_src2_v;
 338     uint8_t *p_trans;
 339     int i_x, i_y, i_pix_pitch;
 340     int r, g, b;
 341
 342     i_pix_pitch = p_dst_pic->p->i_pixel_pitch;
 343     i_dst_pitch = p_dst_pic->p->i_pitch;
 344     p_dst = p_dst_pic->p->p_pixels + i_x_offset * i_pix_pitch +
 345             p_filter->fmt_out.video.i_x_offset * i_pix_pitch +
 346             p_dst_pic->p->i_pitch *
 347             ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 348
 349     i_src1_pitch = p_dst_orig->p[Y_PLANE].i_pitch;
 350     p_src1 = p_dst_orig->p->p_pixels + i_x_offset * i_pix_pitch +
 351                p_filter->fmt_out.video.i_x_offset * i_pix_pitch +
 352                p_dst_orig->p->i_pitch *
 353                ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 354
 355     i_src2_pitch = p_src->p[Y_PLANE].i_pitch;
 356     p_src2_y = p_src->p[Y_PLANE].p_pixels +
 357                p_filter->fmt_in.video.i_x_offset +
 358                p_src->p[Y_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset;
 359     p_src2_u = p_src->p[U_PLANE].p_pixels +
 360                p_filter->fmt_in.video.i_x_offset/2 +
 361                p_src->p[U_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset/2;
 362     p_src2_v = p_src->p[V_PLANE].p_pixels +
 363                p_filter->fmt_in.video.i_x_offset/2 +
 364                p_src->p[V_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset/2;
 365
 366     p_trans = p_src->p[A_PLANE].p_pixels +
 367               p_filter->fmt_in.video.i_x_offset +
 368               p_src->p[A_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset;
 369
 370 #define MAX_TRANS 255
 371 #define TRANS_BITS  8
 372
 373     /* Draw until we reach the bottom of the subtitle */
 374     for( i_y = 0; i_y < i_height; i_y++, p_trans += i_src2_pitch,
 375          p_dst += i_dst_pitch, p_src1 += i_src1_pitch,
 376          p_src2_y += i_src2_pitch, p_src2_u += i_src2_pitch,
 377          p_src2_v += i_src2_pitch )
 378     {
 379         /* Draw until we reach the end of the line */
 380         for( i_x = 0; i_x < i_width; i_x++ )
 381         {
 382             if( !p_trans[i_x] )
 383             {
 384                 /* Completely transparent. Don't change pixel */
 385                 continue;
 386             }
 387             else if( p_trans[i_x] == MAX_TRANS )
 388             {
 389                 /* Completely opaque. Completely overwrite underlying pixel */
 390                 yuv_to_rgb( &r, &g, &b,
 391                             p_src2_y[i_x], p_src2_u[i_x], p_src2_v[i_x] );
 392
 393     ((uint16_t *)(&p_dst[i_x * i_pix_pitch]))[0] = ((r >> 3) << 11) | ((g >> 2) << 5) | (b >> 3);
 394                 continue;
 395             }
 396
 397             /* Blending */
 398             yuv_to_rgb( &r, &g, &b,
 399                         p_src2_y[i_x], p_src2_u[i_x], p_src2_v[i_x] );
 400
 401     ((uint16_t *)(&p_dst[i_x * i_pix_pitch]))[0] = ((r >> 3) << 11) | ((g >> 2) << 5) | (b >> 3);
 402         }
 403     }
 404
 405 #undef MAX_TRANS
 406 #undef TRANS_BITS
 407
 408     return;
 409 }
 410
 411 static void BlendR24( filter_t *p_filter, picture_t *p_dst_pic,
 412                       picture_t *p_dst_orig, picture_t *p_src,
 413                       int i_x_offset, int i_y_offset,
 414                       int i_width, int i_height, int i_alpha )
 415 {
 416     int i_src1_pitch, i_src2_pitch, i_dst_pitch;
 417     uint8_t *p_dst, *p_src1, *p_src2_y;
 418     uint8_t *p_src2_u, *p_src2_v;
 419     uint8_t *p_trans;
 420     int i_x, i_y, i_pix_pitch, i_trans;
 421     int r, g, b;
 422
 423     i_pix_pitch = p_dst_pic->p->i_pixel_pitch;
 424     i_dst_pitch = p_dst_pic->p->i_pitch;
 425     p_dst = p_dst_pic->p->p_pixels + i_x_offset * i_pix_pitch +
 426             p_filter->fmt_out.video.i_x_offset * i_pix_pitch +
 427             p_dst_pic->p->i_pitch *
 428             ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 429
 430     i_src1_pitch = p_dst_orig->p[Y_PLANE].i_pitch;
 431     p_src1 = p_dst_orig->p->p_pixels + i_x_offset * i_pix_pitch +
 432                p_filter->fmt_out.video.i_x_offset * i_pix_pitch +
 433                p_dst_orig->p->i_pitch *
 434                ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 435
 436     i_src2_pitch = p_src->p[Y_PLANE].i_pitch;
 437     p_src2_y = p_src->p[Y_PLANE].p_pixels +
 438                p_filter->fmt_in.video.i_x_offset +
 439                p_src->p[Y_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset;
 440     p_src2_u = p_src->p[U_PLANE].p_pixels +
 441                p_filter->fmt_in.video.i_x_offset/2 +
 442                p_src->p[U_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset/2;
 443     p_src2_v = p_src->p[V_PLANE].p_pixels +
 444                p_filter->fmt_in.video.i_x_offset/2 +
 445                p_src->p[V_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset/2;
 446
 447     p_trans = p_src->p[A_PLANE].p_pixels +
 448               p_filter->fmt_in.video.i_x_offset +
 449               p_src->p[A_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset;
 450
 451 #define MAX_TRANS 255
 452 #define TRANS_BITS  8
 453
 454     /* Draw until we reach the bottom of the subtitle */
 455     for( i_y = 0; i_y < i_height; i_y++, p_trans += i_src2_pitch,
 456          p_dst += i_dst_pitch, p_src1 += i_src1_pitch,
 457          p_src2_y += i_src2_pitch, p_src2_u += i_src2_pitch,
 458          p_src2_v += i_src2_pitch )
 459     {
 460         /* Draw until we reach the end of the line */
 461         for( i_x = 0; i_x < i_width; i_x++ )
 462         {
 463             i_trans = ( p_trans[i_x] * i_alpha ) / 255;
 464             if( !i_trans )
 465             {
 466                 /* Completely transparent. Don't change pixel */
 467                 continue;
 468             }
 469             else if( i_trans == MAX_TRANS )
 470             {
 471                 /* Completely opaque. Completely overwrite underlying pixel */
 472                 yuv_to_rgb( &r, &g, &b,
 473                             p_src2_y[i_x], p_src2_u[i_x], p_src2_v[i_x] );
 474
 475                 p_dst[i_x * i_pix_pitch]     = r;
 476                 p_dst[i_x * i_pix_pitch + 1] = g;
 477                 p_dst[i_x * i_pix_pitch + 2] = b;
 478                 continue;
 479             }
 480
 481             /* Blending */
 482             yuv_to_rgb( &r, &g, &b,
 483                         p_src2_y[i_x], p_src2_u[i_x], p_src2_v[i_x] );
 484
 485             p_dst[i_x * i_pix_pitch]     = ( r * i_trans +
 486                 (uint16_t)p_src1[i_x * i_pix_pitch] *
 487                 (MAX_TRANS - i_trans) ) >> TRANS_BITS;
 488             p_dst[i_x * i_pix_pitch + 1] = ( g * i_trans +
 489                 (uint16_t)p_src1[i_x * i_pix_pitch + 1] *
 490                 (MAX_TRANS - i_trans) ) >> TRANS_BITS;
 491             p_dst[i_x * i_pix_pitch + 2] = ( b * i_trans +
 492                 (uint16_t)p_src1[i_x * i_pix_pitch + 2] *
 493                 (MAX_TRANS - i_trans) ) >> TRANS_BITS;
 494         }
 495     }
 496
 497 #undef MAX_TRANS
 498 #undef TRANS_BITS
 499
 500     return;
 501 }
 502
 503 static void BlendYUY2( filter_t *p_filter, picture_t *p_dst_pic,
 504                        picture_t *p_dst_orig, picture_t *p_src,
 505                        int i_x_offset, int i_y_offset,
 506                        int i_width, int i_height, int i_alpha )
 507 {
 508     int i_src1_pitch, i_src2_pitch, i_dst_pitch;
 509     uint8_t *p_dst, *p_src1, *p_src2_y;
 510     uint8_t *p_src2_u, *p_src2_v;
 511     uint8_t *p_trans;
 512     int i_x, i_y, i_pix_pitch, i_trans;
 513     vlc_bool_t b_even = !((i_x_offset + p_filter->fmt_out.video.i_x_offset)%2);
 514
 515     i_pix_pitch = 2;
 516     i_dst_pitch = p_dst_pic->p->i_pitch;
 517     p_dst = p_dst_pic->p->p_pixels + i_x_offset * i_pix_pitch +
 518             p_filter->fmt_out.video.i_x_offset * i_pix_pitch +
 519             p_dst_pic->p->i_pitch *
 520             ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 521
 522     i_src1_pitch = p_dst_orig->p[Y_PLANE].i_pitch;
 523     p_src1 = p_dst_orig->p->p_pixels + i_x_offset * i_pix_pitch +
 524                p_filter->fmt_out.video.i_x_offset * i_pix_pitch +
 525                p_dst_orig->p->i_pitch *
 526                ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 527
 528     i_src2_pitch = p_src->p[Y_PLANE].i_pitch;
 529     p_src2_y = p_src->p[Y_PLANE].p_pixels +
 530                p_filter->fmt_in.video.i_x_offset +
 531                p_src->p[Y_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset;
 532     p_src2_u = p_src->p[U_PLANE].p_pixels +
 533                p_filter->fmt_in.video.i_x_offset/2 +
 534                p_src->p[U_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset/2;
 535     p_src2_v = p_src->p[V_PLANE].p_pixels +
 536                p_filter->fmt_in.video.i_x_offset/2 +
 537                p_src->p[V_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset/2;
 538
 539     p_trans = p_src->p[A_PLANE].p_pixels +
 540               p_filter->fmt_in.video.i_x_offset +
 541               p_src->p[A_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset;
 542
 543     i_width = (i_width >> 1) << 1; /* Needs to be a multiple of 2 */
 544
 545 #define MAX_TRANS 255
 546 #define TRANS_BITS  8
 547
 548     /* Draw until we reach the bottom of the subtitle */
 549     for( i_y = 0; i_y < i_height; i_y++, p_trans += i_src2_pitch,
 550          p_dst += i_dst_pitch, p_src1 += i_src1_pitch,
 551          p_src2_y += i_src2_pitch, p_src2_u += i_src2_pitch,
 552          p_src2_v += i_src2_pitch )
 553     {
 554         /* Draw until we reach the end of the line */
 555         for( i_x = 0; i_x < i_width; i_x++, b_even = !b_even )
 556         {
 557             i_trans = ( p_trans[i_x] * i_alpha ) / 255;
 558             if( !i_trans )
 559             {
 560                 /* Completely transparent. Don't change pixel */
 561             }
 562             else if( i_trans == MAX_TRANS )
 563             {
 564                 /* Completely opaque. Completely overwrite underlying pixel */
 565                 p_dst[i_x * 2]     = p_src2_y[i_x];
 566
 567                 if( b_even )
 568                 {
 569                     p_dst[i_x * 2 + 1] = p_src2_u[i_x];
 570                     p_dst[i_x * 2 + 3] = p_src2_v[i_x];
 571                 }
 572             }
 573             else
 574             {
 575                 /* Blending */
 576                 p_dst[i_x * 2]     = ( (uint16_t)p_src2_y[i_x] * i_trans +
 577                     (uint16_t)p_src1[i_x * 2] * (MAX_TRANS - i_trans) )
 578                     >> TRANS_BITS;
 579
 580                 if( b_even )
 581                 {
 582                     p_dst[i_x * 2 + 1] = ( (uint16_t)p_src2_u[i_x] * i_trans +
 583                         (uint16_t)p_src1[i_x * 2 + 1] * (MAX_TRANS - i_trans) )
 584                         >> TRANS_BITS;
 585                     p_dst[i_x * 2 + 3] = ( (uint16_t)p_src2_v[i_x] * i_trans +
 586                         (uint16_t)p_src1[i_x * 2 + 3] * (MAX_TRANS - i_trans) )
 587                         >> TRANS_BITS;
 588                 }
 589             }
 590         }
 591     }
 592
 593 #undef MAX_TRANS
 594 #undef TRANS_BITS
 595
 596     return;
 597 }
 598
 599 static void BlendPalI420( filter_t *p_filter, picture_t *p_dst,
 600                           picture_t *p_dst_orig, picture_t *p_src,
 601                           int i_x_offset, int i_y_offset,
 602                           int i_width, int i_height, int i_alpha )
 603 {
 604     int i_src1_pitch, i_src2_pitch, i_dst_pitch;
 605     uint8_t *p_src1_y, *p_src2, *p_dst_y;
 606     uint8_t *p_src1_u, *p_dst_u;
 607     uint8_t *p_src1_v, *p_dst_v;
 608     int i_x, i_y, i_trans;
 609     vlc_bool_t b_even_scanline = i_y_offset % 2;
 610
 611     i_dst_pitch = p_dst->p[Y_PLANE].i_pitch;
 612     p_dst_y = p_dst->p[Y_PLANE].p_pixels + i_x_offset +
 613               p_filter->fmt_out.video.i_x_offset +
 614               p_dst->p[Y_PLANE].i_pitch *
 615               ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 616     p_dst_u = p_dst->p[U_PLANE].p_pixels + i_x_offset/2 +
 617               p_filter->fmt_out.video.i_x_offset/2 +
 618               ( i_y_offset + p_filter->fmt_out.video.i_y_offset ) / 2 *
 619               p_dst->p[U_PLANE].i_pitch;
 620     p_dst_v = p_dst->p[V_PLANE].p_pixels + i_x_offset/2 +
 621               p_filter->fmt_out.video.i_x_offset/2 +
 622               ( i_y_offset + p_filter->fmt_out.video.i_y_offset ) / 2 *
 623               p_dst->p[V_PLANE].i_pitch;
 624
 625     i_src1_pitch = p_dst_orig->p[Y_PLANE].i_pitch;
 626     p_src1_y = p_dst_orig->p[Y_PLANE].p_pixels + i_x_offset +
 627                p_filter->fmt_out.video.i_x_offset +
 628                p_dst_orig->p[Y_PLANE].i_pitch *
 629                ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 630     p_src1_u = p_dst_orig->p[U_PLANE].p_pixels + i_x_offset/2 +
 631                p_filter->fmt_out.video.i_x_offset/2 +
 632                ( i_y_offset + p_filter->fmt_out.video.i_y_offset ) / 2 *
 633                p_dst_orig->p[U_PLANE].i_pitch;
 634     p_src1_v = p_dst_orig->p[V_PLANE].p_pixels + i_x_offset/2 +
 635                p_filter->fmt_out.video.i_x_offset/2 +
 636                ( i_y_offset + p_filter->fmt_out.video.i_y_offset ) / 2 *
 637                p_dst_orig->p[V_PLANE].i_pitch;
 638
 639     i_src2_pitch = p_src->p->i_pitch;
 640     p_src2 = p_src->p->p_pixels + p_filter->fmt_in.video.i_x_offset +
 641              i_src2_pitch * p_filter->fmt_in.video.i_y_offset;
 642
 643 #define MAX_TRANS 255
 644 #define TRANS_BITS  8
 645 #define p_trans p_src2
 646 #define p_pal p_filter->fmt_in.video.p_palette->palette
 647
 648     /* Draw until we reach the bottom of the subtitle */
 649     for( i_y = 0; i_y < i_height; i_y++,
 650          p_dst_y += i_dst_pitch, p_src1_y += i_src1_pitch,
 651          p_src2 += i_src2_pitch,
 652          p_dst_u += b_even_scanline ? i_dst_pitch/2 : 0,
 653          p_src1_u += b_even_scanline ? i_src1_pitch/2 : 0,
 654          p_dst_v += b_even_scanline ? i_dst_pitch/2 : 0,
 655          p_src1_v += b_even_scanline ? i_src1_pitch/2 : 0 )
 656     {
 657         b_even_scanline = !b_even_scanline;
 658
 659         /* Draw until we reach the end of the line */
 660         for( i_x = 0; i_x < i_width; i_x++ )
 661         {
 662             i_trans = ( p_pal[p_trans[i_x]][3] * i_alpha ) / 255;
 663             if( !i_trans )
 664             {
 665                 /* Completely transparent. Don't change pixel */
 666                 continue;
 667             }
 668             else if( i_trans == MAX_TRANS )
 669             {
 670                 /* Completely opaque. Completely overwrite underlying pixel */
 671                 p_dst_y[i_x] = p_pal[p_src2[i_x]][0];
 672
 673                 if( b_even_scanline && i_x % 2 == 0 )
 674                 {
 675                     p_dst_u[i_x/2] = p_pal[p_src2[i_x]][1];
 676                     p_dst_v[i_x/2] = p_pal[p_src2[i_x]][2];
 677                 }
 678                 continue;
 679             }
 680
 681             /* Blending */
 682             p_dst_y[i_x] = ( (uint16_t)p_pal[p_src2[i_x]][0] * i_trans +
 683                 (uint16_t)p_src1_y[i_x] * (MAX_TRANS - i_trans) )
 684                 >> TRANS_BITS;
 685
 686             if( b_even_scanline && i_x % 2 == 0 )
 687             {
 688                 p_dst_u[i_x/2] = ( (uint16_t)p_pal[p_src2[i_x]][1] * i_trans +
 689                     (uint16_t)p_src1_u[i_x/2] * (MAX_TRANS - i_trans) )
 690                     >> TRANS_BITS;
 691                 p_dst_v[i_x/2] = ( (uint16_t)p_pal[p_src2[i_x]][2] * i_trans +
 692                     (uint16_t)p_src1_v[i_x/2] * (MAX_TRANS - i_trans) )
 693                     >> TRANS_BITS;
 694             }
 695         }
 696     }
 697
 698 #undef MAX_TRANS
 699 #undef TRANS_BITS
 700 #undef p_trans
 701 #undef p_pal
 702
 703     return;
 704 }
 705
 706 static void BlendPalYUY2( filter_t *p_filter, picture_t *p_dst_pic,
 707                           picture_t *p_dst_orig, picture_t *p_src,
 708                           int i_x_offset, int i_y_offset,
 709                           int i_width, int i_height, int i_alpha )
 710 {
 711     int i_src1_pitch, i_src2_pitch, i_dst_pitch;
 712     uint8_t *p_src1, *p_src2, *p_dst;
 713     int i_x, i_y, i_pix_pitch, i_trans;
 714     vlc_bool_t b_even = !((i_x_offset + p_filter->fmt_out.video.i_x_offset)%2);
 715
 716     i_pix_pitch = 2;
 717     i_dst_pitch = p_dst_pic->p->i_pitch;
 718     p_dst = p_dst_pic->p->p_pixels + i_pix_pitch * (i_x_offset +
 719             p_filter->fmt_out.video.i_x_offset) + p_dst_pic->p->i_pitch *
 720             ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 721
 722     i_src1_pitch = p_dst_orig->p->i_pitch;
 723     p_src1 = p_dst_orig->p->p_pixels + i_pix_pitch * (i_x_offset +
 724              p_filter->fmt_out.video.i_x_offset) + p_dst_orig->p->i_pitch *
 725              ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 726
 727     i_src2_pitch = p_src->p->i_pitch;
 728     p_src2 = p_src->p->p_pixels + p_filter->fmt_in.video.i_x_offset +
 729              i_src2_pitch * p_filter->fmt_in.video.i_y_offset;
 730
 731     i_width = (i_width >> 1) << 1; /* Needs to be a multiple of 2 */
 732
 733 #define MAX_TRANS 255
 734 #define TRANS_BITS  8
 735 #define p_trans p_src2
 736 #define p_pal p_filter->fmt_in.video.p_palette->palette
 737
 738     /* Draw until we reach the bottom of the subtitle */
 739     for( i_y = 0; i_y < i_height; i_y++,
 740          p_dst += i_dst_pitch, p_src1 += i_src1_pitch, p_src2 += i_src2_pitch )
 741     {
 742         /* Draw until we reach the end of the line */
 743         for( i_x = 0; i_x < i_width; i_x++, b_even = !b_even )
 744         {
 745             i_trans = ( p_pal[p_trans[i_x]][3] * i_alpha ) / 255;
 746             if( !i_trans )
 747             {
 748                 /* Completely transparent. Don't change pixel */
 749             }
 750             else if( i_trans == MAX_TRANS )
 751             {
 752                 /* Completely opaque. Completely overwrite underlying pixel */
 753                 p_dst[i_x * 2]     = p_pal[p_src2[i_x]][0];
 754
 755                 if( b_even )
 756                 {
 757                     p_dst[i_x * 2 + 1] = p_pal[p_src2[i_x]][1];
 758                     p_dst[i_x * 2 + 3] = p_pal[p_src2[i_x]][2];
 759                 }
 760             }
 761             else
 762             {
 763                 /* Blending */
 764                 p_dst[i_x * 2]     = ( (uint16_t)p_pal[p_src2[i_x]][0] *
 765                     i_trans + (uint16_t)p_src1[i_x * 2] *
 766                     (MAX_TRANS - i_trans) ) >> TRANS_BITS;
 767
 768                 if( b_even )
 769                 {
 770                     p_dst[i_x * 2 + 1] = ( (uint16_t)p_pal[p_src2[i_x]][1] *
 771                         i_trans + (uint16_t)p_src1[i_x * 2 + 1] *
 772                         (MAX_TRANS - i_trans) ) >> TRANS_BITS;
 773                     p_dst[i_x * 2 + 3] = ( (uint16_t)p_pal[p_src2[i_x]][2] *
 774                         i_trans + (uint16_t)p_src1[i_x * 2 + 3] *
 775                         (MAX_TRANS - i_trans) ) >> TRANS_BITS;
 776                 }
 777             }
 778         }
 779     }
 780
 781 #undef MAX_TRANS
 782 #undef TRANS_BITS
 783 #undef p_trans
 784 #undef p_pal
 785
 786     return;
 787 }
 788
 789 static void BlendPalRV( filter_t *p_filter, picture_t *p_dst_pic,
 790                         picture_t *p_dst_orig, picture_t *p_src,
 791                         int i_x_offset, int i_y_offset,
 792                         int i_width, int i_height, int i_alpha )
 793 {
 794     int i_src1_pitch, i_src2_pitch, i_dst_pitch;
 795     uint8_t *p_src1, *p_src2, *p_dst;
 796     int i_x, i_y, i_pix_pitch, i_trans;
 797     int r, g, b;
 798     video_palette_t rgbpalette;
 799
 800     i_pix_pitch = p_dst_pic->p->i_pixel_pitch;
 801     i_dst_pitch = p_dst_pic->p->i_pitch;
 802     p_dst = p_dst_pic->p->p_pixels + i_pix_pitch * (i_x_offset +
 803             p_filter->fmt_out.video.i_x_offset) + p_dst_pic->p->i_pitch *
 804             ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 805
 806     i_src1_pitch = p_dst_orig->p->i_pitch;
 807     p_src1 = p_dst_orig->p->p_pixels + i_pix_pitch * (i_x_offset +
 808              p_filter->fmt_out.video.i_x_offset) + p_dst_orig->p->i_pitch *
 809              ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 810
 811     i_src2_pitch = p_src->p->i_pitch;
 812     p_src2 = p_src->p->p_pixels + p_filter->fmt_in.video.i_x_offset +
 813              i_src2_pitch * p_filter->fmt_in.video.i_y_offset;
 814
 815 #define MAX_TRANS 255
 816 #define TRANS_BITS  8
 817 #define p_trans p_src2
 818 #define p_pal p_filter->fmt_in.video.p_palette->palette
 819 #define rgbpal rgbpalette.palette
 820
 821     /* Convert palette first */
 822     for( i_y = 0; i_y < p_filter->fmt_in.video.p_palette->i_entries &&
 823          i_y < 256; i_y++ )
 824     {
 825         yuv_to_rgb( &r, &g, &b, p_pal[i_y][0], p_pal[i_y][1], p_pal[i_y][2] );
 826
 827         if( p_filter->fmt_out.video.i_chroma == VLC_FOURCC('R','V','1','6') )
 828         {
 829             *(uint16_t *)rgbpal[i_y] =
 830                 ((r >> 3) << 11) | ((g >> 2) << 5) | (b >> 3);
 831         }
 832         else
 833         {
 834             rgbpal[i_y][0] = r; rgbpal[i_y][1] = g; rgbpal[i_y][2] = b;
 835         }
 836     }
 837
 838     /* Draw until we reach the bottom of the subtitle */
 839     for( i_y = 0; i_y < i_height; i_y++,
 840          p_dst += i_dst_pitch, p_src1 += i_src1_pitch, p_src2 += i_src2_pitch )
 841     {
 842         /* Draw until we reach the end of the line */
 843         for( i_x = 0; i_x < i_width; i_x++ )
 844         {
 845             i_trans = ( p_pal[p_trans[i_x]][3] * i_alpha ) / 255;
 846             if( !i_trans )
 847             {
 848                 /* Completely transparent. Don't change pixel */
 849                 continue;
 850             }
 851             else if( i_trans == MAX_TRANS ||
 852                      p_filter->fmt_out.video.i_chroma ==
 853                      VLC_FOURCC('R','V','1','6') )
 854             {
 855                 /* Completely opaque. Completely overwrite underlying pixel */
 856                 p_dst[i_x * i_pix_pitch]     = rgbpal[p_src2[i_x]][0];
 857                 p_dst[i_x * i_pix_pitch + 1] = rgbpal[p_src2[i_x]][1];
 858                 if( p_filter->fmt_out.video.i_chroma !=
 859                     VLC_FOURCC('R','V','1','6') )
 860                 p_dst[i_x * i_pix_pitch + 2] = rgbpal[p_src2[i_x]][2];
 861                 continue;
 862             }
 863
 864             /* Blending */
 865             p_dst[i_x * i_pix_pitch]     = ( (uint16_t)rgbpal[p_src2[i_x]][0] *
 866                 i_trans + (uint16_t)p_src1[i_x * i_pix_pitch] *
 867                 (MAX_TRANS - i_trans) ) >> TRANS_BITS;
 868             p_dst[i_x * i_pix_pitch + 1] = ( (uint16_t)rgbpal[p_src2[i_x]][1] *
 869                 i_trans + (uint16_t)p_src1[i_x * i_pix_pitch + 1] *
 870                 (MAX_TRANS - i_trans) ) >> TRANS_BITS;
 871             p_dst[i_x * i_pix_pitch + 2] = ( (uint16_t)rgbpal[p_src2[i_x]][2] *
 872                 i_trans + (uint16_t)p_src1[i_x * i_pix_pitch + 2] *
 873                 (MAX_TRANS - i_trans) ) >> TRANS_BITS;
 874         }
 875     }
 876
 877 #undef MAX_TRANS
 878 #undef TRANS_BITS
 879 #undef p_trans
 880 #undef p_pal
 881 #undef rgbpal
 882
 883     return;
 884 }
 885
 886 /*****************************************************************************
 887  * CloseFilter: clean up the filter
 888  *****************************************************************************/
 889 static void CloseFilter( vlc_object_t *p_this )
 890 {
 891     filter_t *p_filter = (filter_t*)p_this;
 892     filter_sys_t *p_sys = p_filter->p_sys;
 893
 894     free( p_sys );
 895 }