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 VideoLAN
   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_category( CAT_VIDEO );
  69     set_subcategory( SUBCAT_VIDEO_VFILTER );
  70     set_capability( "video blending", 100 );
  71     set_callbacks( OpenFilter, CloseFilter );
  72 vlc_module_end();
  73
  74 /*****************************************************************************
  75  * OpenFilter: probe the filter and return score
  76  *****************************************************************************/
  77 static int OpenFilter( vlc_object_t *p_this )
  78 {
  79     filter_t *p_filter = (filter_t*)p_this;
  80     filter_sys_t *p_sys;
  81
  82     /* Check if we can handle that format.
  83      * We could try to use a chroma filter if we can't. */
  84     if( ( p_filter->fmt_in.video.i_chroma != VLC_FOURCC('Y','U','V','A') &&
  85           p_filter->fmt_in.video.i_chroma != VLC_FOURCC('Y','U','V','P') ) ||
  86         ( p_filter->fmt_out.video.i_chroma != VLC_FOURCC('I','4','2','0') &&
  87           p_filter->fmt_out.video.i_chroma != VLC_FOURCC('Y','U','Y','2') &&
  88           p_filter->fmt_out.video.i_chroma != VLC_FOURCC('Y','V','1','2') &&
  89           p_filter->fmt_out.video.i_chroma != VLC_FOURCC('R','V','1','6') &&
  90           p_filter->fmt_out.video.i_chroma != VLC_FOURCC('R','V','2','4') &&
  91           p_filter->fmt_out.video.i_chroma != VLC_FOURCC('R','V','3','2') ) )
  92     {
  93         return VLC_EGENERIC;
  94     }
  95
  96     /* Allocate the memory needed to store the decoder's structure */
  97     if( ( p_filter->p_sys = p_sys =
  98           (filter_sys_t *)malloc(sizeof(filter_sys_t)) ) == NULL )
  99     {
 100         msg_Err( p_filter, "out of memory" );
 101         return VLC_EGENERIC;
 102     }
 103
 104     /* Misc init */
 105     p_filter->pf_video_blend = Blend;
 106
 107     msg_Dbg( p_filter, "chroma: %4.4s -> %4.4s",
 108              (char *)&p_filter->fmt_in.video.i_chroma,
 109              (char *)&p_filter->fmt_out.video.i_chroma );
 110
 111
 112     return VLC_SUCCESS;
 113 }
 114
 115 /****************************************************************************
 116  * Blend: the whole thing
 117  ****************************************************************************
 118  * This function is called just after the thread is launched.
 119  ****************************************************************************/
 120 static void Blend( filter_t *p_filter, picture_t *p_dst,
 121                    picture_t *p_dst_orig, picture_t *p_src,
 122                    int i_x_offset, int i_y_offset, int i_alpha )
 123 {
 124     int i_width, i_height;
 125
 126     i_width = __MIN((int)p_filter->fmt_out.video.i_visible_width - i_x_offset,
 127                     (int)p_filter->fmt_in.video.i_visible_width);
 128
 129     i_height = __MIN((int)p_filter->fmt_out.video.i_visible_height -i_y_offset,
 130                      (int)p_filter->fmt_in.video.i_visible_height);
 131
 132     if( i_width <= 0 || i_height <= 0 ) return;
 133
 134     if( p_filter->fmt_in.video.i_chroma == VLC_FOURCC('Y','U','V','A') &&
 135         ( p_filter->fmt_out.video.i_chroma == VLC_FOURCC('I','4','2','0') ||
 136           p_filter->fmt_out.video.i_chroma == VLC_FOURCC('Y','V','1','2') ) )
 137     {
 138         BlendI420( p_filter, p_dst, p_dst_orig, p_src,
 139                    i_x_offset, i_y_offset, i_width, i_height, i_alpha );
 140         return;
 141     }
 142     if( p_filter->fmt_in.video.i_chroma == VLC_FOURCC('Y','U','V','A') &&
 143         p_filter->fmt_out.video.i_chroma == VLC_FOURCC('Y','U','Y','2') )
 144     {
 145         BlendYUY2( p_filter, p_dst, p_dst_orig, p_src,
 146                    i_x_offset, i_y_offset, i_width, i_height, i_alpha );
 147         return;
 148     }
 149     if( p_filter->fmt_in.video.i_chroma == VLC_FOURCC('Y','U','V','A') &&
 150         p_filter->fmt_out.video.i_chroma == VLC_FOURCC('R','V','1','6') )
 151     {
 152         BlendR16( p_filter, p_dst, p_dst_orig, p_src,
 153                   i_x_offset, i_y_offset, i_width, i_height, i_alpha );
 154         return;
 155     }
 156     if( p_filter->fmt_in.video.i_chroma == VLC_FOURCC('Y','U','V','A') &&
 157         ( p_filter->fmt_out.video.i_chroma == VLC_FOURCC('R','V','2','4') ||
 158           p_filter->fmt_out.video.i_chroma == VLC_FOURCC('R','V','3','2') ) )
 159     {
 160         BlendR24( p_filter, p_dst, p_dst_orig, p_src,
 161                   i_x_offset, i_y_offset, i_width, i_height, i_alpha );
 162         return;
 163     }
 164     if( p_filter->fmt_in.video.i_chroma == VLC_FOURCC('Y','U','V','P') &&
 165         ( p_filter->fmt_out.video.i_chroma == VLC_FOURCC('I','4','2','0') ||
 166           p_filter->fmt_out.video.i_chroma == VLC_FOURCC('Y','V','1','2') ) )
 167     {
 168         BlendPalI420( p_filter, p_dst, p_dst_orig, p_src,
 169                       i_x_offset, i_y_offset, i_width, i_height, i_alpha );
 170         return;
 171     }
 172     if( p_filter->fmt_in.video.i_chroma == VLC_FOURCC('Y','U','V','P') &&
 173         p_filter->fmt_out.video.i_chroma == VLC_FOURCC('Y','U','Y','2') )
 174     {
 175         BlendPalYUY2( p_filter, p_dst, p_dst_orig, p_src,
 176                       i_x_offset, i_y_offset, i_width, i_height, i_alpha );
 177         return;
 178     }
 179     if( p_filter->fmt_in.video.i_chroma == VLC_FOURCC('Y','U','V','P') &&
 180         ( p_filter->fmt_out.video.i_chroma == VLC_FOURCC('R','V','1','6') ||
 181           p_filter->fmt_out.video.i_chroma == VLC_FOURCC('R','V','2','4') ||
 182           p_filter->fmt_out.video.i_chroma == VLC_FOURCC('R','V','3','2') ) )
 183     {
 184         BlendPalRV( p_filter, p_dst, p_dst_orig, p_src,
 185                     i_x_offset, i_y_offset, i_width, i_height, i_alpha );
 186         return;
 187     }
 188
 189     msg_Dbg( p_filter, "no matching alpha blending routine" );
 190 }
 191
 192 static void BlendI420( filter_t *p_filter, picture_t *p_dst,
 193                        picture_t *p_dst_orig, picture_t *p_src,
 194                        int i_x_offset, int i_y_offset,
 195                        int i_width, int i_height, int i_alpha )
 196 {
 197     int i_src1_pitch, i_src2_pitch, i_dst_pitch;
 198     uint8_t *p_src1_y, *p_src2_y, *p_dst_y;
 199     uint8_t *p_src1_u, *p_src2_u, *p_dst_u;
 200     uint8_t *p_src1_v, *p_src2_v, *p_dst_v;
 201     uint8_t *p_trans;
 202     int i_x, i_y, i_trans;
 203     vlc_bool_t b_even_scanline = i_y_offset % 2;
 204
 205     i_dst_pitch = p_dst->p[Y_PLANE].i_pitch;
 206     p_dst_y = p_dst->p[Y_PLANE].p_pixels + i_x_offset +
 207               p_filter->fmt_out.video.i_x_offset +
 208               p_dst->p[Y_PLANE].i_pitch *
 209               ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 210     p_dst_u = p_dst->p[U_PLANE].p_pixels + i_x_offset/2 +
 211               p_filter->fmt_out.video.i_x_offset/2 +
 212               ( i_y_offset + p_filter->fmt_out.video.i_y_offset ) / 2 *
 213               p_dst->p[U_PLANE].i_pitch;
 214     p_dst_v = p_dst->p[V_PLANE].p_pixels + i_x_offset/2 +
 215               p_filter->fmt_out.video.i_x_offset/2 +
 216               ( i_y_offset + p_filter->fmt_out.video.i_y_offset ) / 2 *
 217               p_dst->p[V_PLANE].i_pitch;
 218
 219     i_src1_pitch = p_dst_orig->p[Y_PLANE].i_pitch;
 220     p_src1_y = p_dst_orig->p[Y_PLANE].p_pixels + i_x_offset +
 221                p_filter->fmt_out.video.i_x_offset +
 222                p_dst_orig->p[Y_PLANE].i_pitch *
 223                ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 224     p_src1_u = p_dst_orig->p[U_PLANE].p_pixels + i_x_offset/2 +
 225                p_filter->fmt_out.video.i_x_offset/2 +
 226                ( i_y_offset + p_filter->fmt_out.video.i_y_offset ) / 2 *
 227                p_dst_orig->p[U_PLANE].i_pitch;
 228     p_src1_v = p_dst_orig->p[V_PLANE].p_pixels + i_x_offset/2 +
 229                p_filter->fmt_out.video.i_x_offset/2 +
 230                ( i_y_offset + p_filter->fmt_out.video.i_y_offset ) / 2 *
 231                p_dst_orig->p[V_PLANE].i_pitch;
 232
 233     i_src2_pitch = p_src->p[Y_PLANE].i_pitch;
 234     p_src2_y = p_src->p[Y_PLANE].p_pixels +
 235                p_filter->fmt_in.video.i_x_offset +
 236                p_src->p[Y_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset;
 237     p_src2_u = p_src->p[U_PLANE].p_pixels +
 238                p_filter->fmt_in.video.i_x_offset/2 +
 239                p_src->p[U_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset/2;
 240     p_src2_v = p_src->p[V_PLANE].p_pixels +
 241                p_filter->fmt_in.video.i_x_offset/2 +
 242                p_src->p[V_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset/2;
 243
 244     p_trans = p_src->p[A_PLANE].p_pixels +
 245               p_filter->fmt_in.video.i_x_offset +
 246               p_src->p[A_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset;
 247
 248 #define MAX_TRANS 255
 249 #define TRANS_BITS  8
 250
 251     /* Draw until we reach the bottom of the subtitle */
 252     for( i_y = 0; i_y < i_height; i_y++, p_trans += i_src2_pitch,
 253          p_dst_y += i_dst_pitch, p_src1_y += i_src1_pitch,
 254          p_src2_y += i_src2_pitch,
 255          p_dst_u += b_even_scanline ? i_dst_pitch/2 : 0,
 256          p_src1_u += b_even_scanline ? i_src1_pitch/2 : 0,
 257          p_src2_u += i_src2_pitch,
 258          p_dst_v += b_even_scanline ? i_dst_pitch/2 : 0,
 259          p_src1_v += b_even_scanline ? i_src1_pitch/2 : 0,
 260          p_src2_v += i_src2_pitch )
 261     {
 262         b_even_scanline = !b_even_scanline;
 263
 264         /* Draw until we reach the end of the line */
 265         for( i_x = 0; i_x < i_width; i_x++ )
 266         {
 267             i_trans = ( p_trans[i_x] * i_alpha ) / 255;
 268             if( !i_trans )
 269             {
 270                 /* Completely transparent. Don't change pixel */
 271                 continue;
 272             }
 273             else if( i_trans == MAX_TRANS )
 274             {
 275                 /* Completely opaque. Completely overwrite underlying pixel */
 276                 p_dst_y[i_x] = p_src2_y[i_x];
 277
 278                 if( b_even_scanline && i_x % 2 == 0 )
 279                 {
 280                     p_dst_u[i_x/2] = p_src2_u[i_x];
 281                     p_dst_v[i_x/2] = p_src2_v[i_x];
 282                 }
 283                 continue;
 284             }
 285
 286             /* Blending */
 287             p_dst_y[i_x] = ( (uint16_t)p_src2_y[i_x] * i_trans +
 288                 (uint16_t)p_src1_y[i_x] * (MAX_TRANS - i_trans) )
 289                 >> TRANS_BITS;
 290
 291             if( b_even_scanline && i_x % 2 == 0 )
 292             {
 293                 p_dst_u[i_x/2] = ( (uint16_t)p_src2_u[i_x] * i_trans +
 294                 (uint16_t)p_src1_u[i_x/2] * (MAX_TRANS - i_trans) )
 295                 >> TRANS_BITS;
 296                 p_dst_v[i_x/2] = ( (uint16_t)p_src2_v[i_x] * i_trans +
 297                 (uint16_t)p_src1_v[i_x/2] * (MAX_TRANS - i_trans) )
 298                 >> TRANS_BITS;
 299             }
 300         }
 301     }
 302
 303 #undef MAX_TRANS
 304 #undef TRANS_BITS
 305
 306     return;
 307 }
 308
 309 static inline void yuv_to_rgb( int *r, int *g, int *b,
 310                                uint8_t y1, uint8_t u1, uint8_t v1 )
 311 {
 312     /* macros used for YUV pixel conversions */
 313 #   define SCALEBITS 10
 314 #   define ONE_HALF  (1 << (SCALEBITS - 1))
 315 #   define FIX(x)    ((int) ((x) * (1<<SCALEBITS) + 0.5))
 316 #   define CLAMP( x ) (((x) > 255) ? 255 : ((x) < 0) ? 0 : (x));
 317
 318     int y, cb, cr, r_add, g_add, b_add;
 319
 320     cb = u1 - 128;
 321     cr = v1 - 128;
 322     r_add = FIX(1.40200*255.0/224.0) * cr + ONE_HALF;
 323     g_add = - FIX(0.34414*255.0/224.0) * cb
 324             - FIX(0.71414*255.0/224.0) * cr + ONE_HALF;
 325     b_add = FIX(1.77200*255.0/224.0) * cb + ONE_HALF;
 326     y = (y1 - 16) * FIX(255.0/219.0);
 327     *r = CLAMP((y + r_add) >> SCALEBITS);
 328     *g = CLAMP((y + g_add) >> SCALEBITS);
 329     *b = CLAMP((y + b_add) >> SCALEBITS);
 330 }
 331
 332 static void BlendR16( filter_t *p_filter, picture_t *p_dst_pic,
 333                       picture_t *p_dst_orig, picture_t *p_src,
 334                       int i_x_offset, int i_y_offset,
 335                       int i_width, int i_height, int i_alpha )
 336 {
 337     int i_src1_pitch, i_src2_pitch, i_dst_pitch;
 338     uint8_t *p_dst, *p_src1, *p_src2_y;
 339     uint8_t *p_src2_u, *p_src2_v;
 340     uint8_t *p_trans;
 341     int i_x, i_y, i_pix_pitch;
 342     int r, g, b;
 343
 344     i_pix_pitch = p_dst_pic->p->i_pixel_pitch;
 345     i_dst_pitch = p_dst_pic->p->i_pitch;
 346     p_dst = p_dst_pic->p->p_pixels + i_x_offset * i_pix_pitch +
 347             p_filter->fmt_out.video.i_x_offset * i_pix_pitch +
 348             p_dst_pic->p->i_pitch *
 349             ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 350
 351     i_src1_pitch = p_dst_orig->p[Y_PLANE].i_pitch;
 352     p_src1 = p_dst_orig->p->p_pixels + i_x_offset * i_pix_pitch +
 353                p_filter->fmt_out.video.i_x_offset * i_pix_pitch +
 354                p_dst_orig->p->i_pitch *
 355                ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 356
 357     i_src2_pitch = p_src->p[Y_PLANE].i_pitch;
 358     p_src2_y = p_src->p[Y_PLANE].p_pixels +
 359                p_filter->fmt_in.video.i_x_offset +
 360                p_src->p[Y_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset;
 361     p_src2_u = p_src->p[U_PLANE].p_pixels +
 362                p_filter->fmt_in.video.i_x_offset/2 +
 363                p_src->p[U_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset/2;
 364     p_src2_v = p_src->p[V_PLANE].p_pixels +
 365                p_filter->fmt_in.video.i_x_offset/2 +
 366                p_src->p[V_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset/2;
 367
 368     p_trans = p_src->p[A_PLANE].p_pixels +
 369               p_filter->fmt_in.video.i_x_offset +
 370               p_src->p[A_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset;
 371
 372 #define MAX_TRANS 255
 373 #define TRANS_BITS  8
 374
 375     /* Draw until we reach the bottom of the subtitle */
 376     for( i_y = 0; i_y < i_height; i_y++, p_trans += i_src2_pitch,
 377          p_dst += i_dst_pitch, p_src1 += i_src1_pitch,
 378          p_src2_y += i_src2_pitch, p_src2_u += i_src2_pitch,
 379          p_src2_v += i_src2_pitch )
 380     {
 381         /* Draw until we reach the end of the line */
 382         for( i_x = 0; i_x < i_width; i_x++ )
 383         {
 384             if( !p_trans[i_x] )
 385             {
 386                 /* Completely transparent. Don't change pixel */
 387                 continue;
 388             }
 389             else if( p_trans[i_x] == MAX_TRANS )
 390             {
 391                 /* Completely opaque. Completely overwrite underlying pixel */
 392                 yuv_to_rgb( &r, &g, &b,
 393                             p_src2_y[i_x], p_src2_u[i_x], p_src2_v[i_x] );
 394
 395     ((uint16_t *)(&p_dst[i_x * i_pix_pitch]))[0] = ((r >> 3) << 11) | ((g >> 2) << 5) | (b >> 3);
 396                 continue;
 397             }
 398
 399             /* Blending */
 400             yuv_to_rgb( &r, &g, &b,
 401                         p_src2_y[i_x], p_src2_u[i_x], p_src2_v[i_x] );
 402
 403     ((uint16_t *)(&p_dst[i_x * i_pix_pitch]))[0] = ((r >> 3) << 11) | ((g >> 2) << 5) | (b >> 3);
 404         }
 405     }
 406
 407 #undef MAX_TRANS
 408 #undef TRANS_BITS
 409
 410     return;
 411 }
 412
 413 static void BlendR24( filter_t *p_filter, picture_t *p_dst_pic,
 414                       picture_t *p_dst_orig, picture_t *p_src,
 415                       int i_x_offset, int i_y_offset,
 416                       int i_width, int i_height, int i_alpha )
 417 {
 418     int i_src1_pitch, i_src2_pitch, i_dst_pitch;
 419     uint8_t *p_dst, *p_src1, *p_src2_y;
 420     uint8_t *p_src2_u, *p_src2_v;
 421     uint8_t *p_trans;
 422     int i_x, i_y, i_pix_pitch, i_trans;
 423     int r, g, b;
 424
 425     i_pix_pitch = p_dst_pic->p->i_pixel_pitch;
 426     i_dst_pitch = p_dst_pic->p->i_pitch;
 427     p_dst = p_dst_pic->p->p_pixels + i_x_offset * i_pix_pitch +
 428             p_filter->fmt_out.video.i_x_offset * i_pix_pitch +
 429             p_dst_pic->p->i_pitch *
 430             ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 431
 432     i_src1_pitch = p_dst_orig->p[Y_PLANE].i_pitch;
 433     p_src1 = p_dst_orig->p->p_pixels + i_x_offset * i_pix_pitch +
 434                p_filter->fmt_out.video.i_x_offset * i_pix_pitch +
 435                p_dst_orig->p->i_pitch *
 436                ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 437
 438     i_src2_pitch = p_src->p[Y_PLANE].i_pitch;
 439     p_src2_y = p_src->p[Y_PLANE].p_pixels +
 440                p_filter->fmt_in.video.i_x_offset +
 441                p_src->p[Y_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset;
 442     p_src2_u = p_src->p[U_PLANE].p_pixels +
 443                p_filter->fmt_in.video.i_x_offset/2 +
 444                p_src->p[U_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset/2;
 445     p_src2_v = p_src->p[V_PLANE].p_pixels +
 446                p_filter->fmt_in.video.i_x_offset/2 +
 447                p_src->p[V_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset/2;
 448
 449     p_trans = p_src->p[A_PLANE].p_pixels +
 450               p_filter->fmt_in.video.i_x_offset +
 451               p_src->p[A_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset;
 452
 453 #define MAX_TRANS 255
 454 #define TRANS_BITS  8
 455
 456     /* Draw until we reach the bottom of the subtitle */
 457     for( i_y = 0; i_y < i_height; i_y++, p_trans += i_src2_pitch,
 458          p_dst += i_dst_pitch, p_src1 += i_src1_pitch,
 459          p_src2_y += i_src2_pitch, p_src2_u += i_src2_pitch,
 460          p_src2_v += i_src2_pitch )
 461     {
 462         /* Draw until we reach the end of the line */
 463         for( i_x = 0; i_x < i_width; i_x++ )
 464         {
 465             i_trans = ( p_trans[i_x] * i_alpha ) / 255;
 466             if( !i_trans )
 467             {
 468                 /* Completely transparent. Don't change pixel */
 469                 continue;
 470             }
 471             else if( i_trans == MAX_TRANS )
 472             {
 473                 /* Completely opaque. Completely overwrite underlying pixel */
 474                 yuv_to_rgb( &r, &g, &b,
 475                             p_src2_y[i_x], p_src2_u[i_x], p_src2_v[i_x] );
 476
 477                 p_dst[i_x * i_pix_pitch]     = r;
 478                 p_dst[i_x * i_pix_pitch + 1] = g;
 479                 p_dst[i_x * i_pix_pitch + 2] = b;
 480                 continue;
 481             }
 482
 483             /* Blending */
 484             yuv_to_rgb( &r, &g, &b,
 485                         p_src2_y[i_x], p_src2_u[i_x], p_src2_v[i_x] );
 486
 487             p_dst[i_x * i_pix_pitch]     = ( r * i_trans +
 488                 (uint16_t)p_src1[i_x * i_pix_pitch] *
 489                 (MAX_TRANS - i_trans) ) >> TRANS_BITS;
 490             p_dst[i_x * i_pix_pitch + 1] = ( g * i_trans +
 491                 (uint16_t)p_src1[i_x * i_pix_pitch + 1] *
 492                 (MAX_TRANS - i_trans) ) >> TRANS_BITS;
 493             p_dst[i_x * i_pix_pitch + 2] = ( b * i_trans +
 494                 (uint16_t)p_src1[i_x * i_pix_pitch + 2] *
 495                 (MAX_TRANS - i_trans) ) >> TRANS_BITS;
 496         }
 497     }
 498
 499 #undef MAX_TRANS
 500 #undef TRANS_BITS
 501
 502     return;
 503 }
 504
 505 static void BlendYUY2( filter_t *p_filter, picture_t *p_dst_pic,
 506                        picture_t *p_dst_orig, picture_t *p_src,
 507                        int i_x_offset, int i_y_offset,
 508                        int i_width, int i_height, int i_alpha )
 509 {
 510     int i_src1_pitch, i_src2_pitch, i_dst_pitch;
 511     uint8_t *p_dst, *p_src1, *p_src2_y;
 512     uint8_t *p_src2_u, *p_src2_v;
 513     uint8_t *p_trans;
 514     int i_x, i_y, i_pix_pitch, i_trans;
 515
 516     i_pix_pitch = 2;
 517     i_dst_pitch = p_dst_pic->p->i_pitch;
 518     p_dst = p_dst_pic->p->p_pixels + i_x_offset * i_pix_pitch +
 519             p_filter->fmt_out.video.i_x_offset * i_pix_pitch +
 520             p_dst_pic->p->i_pitch *
 521             ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 522
 523     i_src1_pitch = p_dst_orig->p[Y_PLANE].i_pitch;
 524     p_src1 = p_dst_orig->p->p_pixels + i_x_offset * i_pix_pitch +
 525                p_filter->fmt_out.video.i_x_offset * i_pix_pitch +
 526                p_dst_orig->p->i_pitch *
 527                ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 528
 529     i_src2_pitch = p_src->p[Y_PLANE].i_pitch;
 530     p_src2_y = p_src->p[Y_PLANE].p_pixels +
 531                p_filter->fmt_in.video.i_x_offset +
 532                p_src->p[Y_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset;
 533     p_src2_u = p_src->p[U_PLANE].p_pixels +
 534                p_filter->fmt_in.video.i_x_offset/2 +
 535                p_src->p[U_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset/2;
 536     p_src2_v = p_src->p[V_PLANE].p_pixels +
 537                p_filter->fmt_in.video.i_x_offset/2 +
 538                p_src->p[V_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset/2;
 539
 540     p_trans = p_src->p[A_PLANE].p_pixels +
 541               p_filter->fmt_in.video.i_x_offset +
 542               p_src->p[A_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset;
 543
 544 #define MAX_TRANS 255
 545 #define TRANS_BITS  8
 546
 547     /* Draw until we reach the bottom of the subtitle */
 548     for( i_y = 0; i_y < i_height; i_y++, p_trans += i_src2_pitch,
 549          p_dst += i_dst_pitch, p_src1 += i_src1_pitch,
 550          p_src2_y += i_src2_pitch, p_src2_u += i_src2_pitch,
 551          p_src2_v += i_src2_pitch )
 552     {
 553         /* Draw until we reach the end of the line */
 554         for( i_x = 0; i_x < i_width; i_x += 2 )
 555         {
 556             i_trans = ( p_trans[i_x] * i_alpha ) / 255;
 557             if( !i_trans )
 558             {
 559                 /* Completely transparent. Don't change pixel */
 560             }
 561             else if( i_trans == MAX_TRANS )
 562             {
 563                 /* Completely opaque. Completely overwrite underlying pixel */
 564                 p_dst[i_x * 2]     = p_src2_y[i_x];
 565                 p_dst[i_x * 2 + 1] = p_src2_u[i_x];
 566                 p_dst[i_x * 2 + 3] = p_src2_v[i_x];
 567             }
 568             else
 569             {
 570                 /* Blending */
 571                 p_dst[i_x * 2]     = ( (uint16_t)p_src2_y[i_x] * i_trans +
 572                     (uint16_t)p_src1[i_x * 2] * (MAX_TRANS - i_trans) )
 573                     >> TRANS_BITS;
 574                 p_dst[i_x * 2 + 1] = ( (uint16_t)p_src2_u[i_x] * i_trans +
 575                     (uint16_t)p_src1[i_x * 2 + 1] * (MAX_TRANS - i_trans) )
 576                     >> TRANS_BITS;
 577                 p_dst[i_x * 2 + 3] = ( (uint16_t)p_src2_v[i_x] * i_trans +
 578                     (uint16_t)p_src1[i_x * 2 + 3] * (MAX_TRANS - i_trans) )
 579                     >> TRANS_BITS;
 580             }
 581
 582             i_trans = ( p_trans[i_x+1] * i_alpha ) / 255;
 583             if( !i_trans )
 584             {
 585                 /* Completely transparent. Don't change pixel */
 586             }
 587             else if( i_trans == MAX_TRANS )
 588             {
 589                 /* Completely opaque. Completely overwrite underlying pixel */
 590                 p_dst[i_x * 2 + 2] = p_src2_y[i_x + 1];
 591             }
 592             else
 593             {
 594                 /* Blending */
 595                 p_dst[i_x * 2 + 2] = ( (uint16_t)p_src2_y[i_x+1] * i_trans +
 596                     (uint16_t)p_src1[i_x * 2 + 2] * (MAX_TRANS - i_trans) )
 597                     >> TRANS_BITS;
 598             }
 599         }
 600     }
 601
 602 #undef MAX_TRANS
 603 #undef TRANS_BITS
 604
 605     return;
 606 }
 607
 608 static void BlendPalI420( filter_t *p_filter, picture_t *p_dst,
 609                           picture_t *p_dst_orig, picture_t *p_src,
 610                           int i_x_offset, int i_y_offset,
 611                           int i_width, int i_height, int i_alpha )
 612 {
 613     int i_src1_pitch, i_src2_pitch, i_dst_pitch;
 614     uint8_t *p_src1_y, *p_src2, *p_dst_y;
 615     uint8_t *p_src1_u, *p_dst_u;
 616     uint8_t *p_src1_v, *p_dst_v;
 617     int i_x, i_y, i_trans;
 618     vlc_bool_t b_even_scanline = i_y_offset % 2;
 619
 620     i_dst_pitch = p_dst->p[Y_PLANE].i_pitch;
 621     p_dst_y = p_dst->p[Y_PLANE].p_pixels + i_x_offset +
 622               p_filter->fmt_out.video.i_x_offset +
 623               p_dst->p[Y_PLANE].i_pitch *
 624               ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 625     p_dst_u = p_dst->p[U_PLANE].p_pixels + i_x_offset/2 +
 626               p_filter->fmt_out.video.i_x_offset/2 +
 627               ( i_y_offset + p_filter->fmt_out.video.i_y_offset ) / 2 *
 628               p_dst->p[U_PLANE].i_pitch;
 629     p_dst_v = p_dst->p[V_PLANE].p_pixels + i_x_offset/2 +
 630               p_filter->fmt_out.video.i_x_offset/2 +
 631               ( i_y_offset + p_filter->fmt_out.video.i_y_offset ) / 2 *
 632               p_dst->p[V_PLANE].i_pitch;
 633
 634     i_src1_pitch = p_dst_orig->p[Y_PLANE].i_pitch;
 635     p_src1_y = p_dst_orig->p[Y_PLANE].p_pixels + i_x_offset +
 636                p_filter->fmt_out.video.i_x_offset +
 637                p_dst_orig->p[Y_PLANE].i_pitch *
 638                ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 639     p_src1_u = p_dst_orig->p[U_PLANE].p_pixels + i_x_offset/2 +
 640                p_filter->fmt_out.video.i_x_offset/2 +
 641                ( i_y_offset + p_filter->fmt_out.video.i_y_offset ) / 2 *
 642                p_dst_orig->p[U_PLANE].i_pitch;
 643     p_src1_v = p_dst_orig->p[V_PLANE].p_pixels + i_x_offset/2 +
 644                p_filter->fmt_out.video.i_x_offset/2 +
 645                ( i_y_offset + p_filter->fmt_out.video.i_y_offset ) / 2 *
 646                p_dst_orig->p[V_PLANE].i_pitch;
 647
 648     i_src2_pitch = p_src->p->i_pitch;
 649     p_src2 = p_src->p->p_pixels + p_filter->fmt_in.video.i_x_offset +
 650              i_src2_pitch * p_filter->fmt_in.video.i_y_offset;
 651
 652 #define MAX_TRANS 255
 653 #define TRANS_BITS  8
 654 #define p_trans p_src2
 655 #define p_pal p_filter->fmt_in.video.p_palette->palette
 656
 657     /* Draw until we reach the bottom of the subtitle */
 658     for( i_y = 0; i_y < i_height; i_y++,
 659          p_dst_y += i_dst_pitch, p_src1_y += i_src1_pitch,
 660          p_src2 += i_src2_pitch,
 661          p_dst_u += b_even_scanline ? i_dst_pitch/2 : 0,
 662          p_src1_u += b_even_scanline ? i_src1_pitch/2 : 0,
 663          p_dst_v += b_even_scanline ? i_dst_pitch/2 : 0,
 664          p_src1_v += b_even_scanline ? i_src1_pitch/2 : 0 )
 665     {
 666         b_even_scanline = !b_even_scanline;
 667
 668         /* Draw until we reach the end of the line */
 669         for( i_x = 0; i_x < i_width; i_x++ )
 670         {
 671             i_trans = ( p_pal[p_trans[i_x]][3] * i_alpha ) / 255;
 672             if( !i_trans )
 673             {
 674                 /* Completely transparent. Don't change pixel */
 675                 continue;
 676             }
 677             else if( i_trans == MAX_TRANS )
 678             {
 679                 /* Completely opaque. Completely overwrite underlying pixel */
 680                 p_dst_y[i_x] = p_pal[p_src2[i_x]][0];
 681
 682                 if( b_even_scanline && i_x % 2 == 0 )
 683                 {
 684                     p_dst_u[i_x/2] = p_pal[p_src2[i_x]][1];
 685                     p_dst_v[i_x/2] = p_pal[p_src2[i_x]][2];
 686                 }
 687                 continue;
 688             }
 689
 690             /* Blending */
 691             p_dst_y[i_x] = ( (uint16_t)p_pal[p_src2[i_x]][0] * i_trans +
 692                 (uint16_t)p_src1_y[i_x] * (MAX_TRANS - i_trans) )
 693                 >> TRANS_BITS;
 694
 695             if( b_even_scanline && i_x % 2 == 0 )
 696             {
 697                 p_dst_u[i_x/2] = ( (uint16_t)p_pal[p_src2[i_x]][1] * i_trans +
 698                     (uint16_t)p_src1_u[i_x/2] * (MAX_TRANS - i_trans) )
 699                     >> TRANS_BITS;
 700                 p_dst_v[i_x/2] = ( (uint16_t)p_pal[p_src2[i_x]][2] * i_trans +
 701                     (uint16_t)p_src1_v[i_x/2] * (MAX_TRANS - i_trans) )
 702                     >> TRANS_BITS;
 703             }
 704         }
 705     }
 706
 707 #undef MAX_TRANS
 708 #undef TRANS_BITS
 709 #undef p_trans
 710 #undef p_pal
 711
 712     return;
 713 }
 714
 715 static void BlendPalYUY2( filter_t *p_filter, picture_t *p_dst_pic,
 716                           picture_t *p_dst_orig, picture_t *p_src,
 717                           int i_x_offset, int i_y_offset,
 718                           int i_width, int i_height, int i_alpha )
 719 {
 720     int i_src1_pitch, i_src2_pitch, i_dst_pitch;
 721     uint8_t *p_src1, *p_src2, *p_dst;
 722     int i_x, i_y, i_pix_pitch, i_trans;
 723
 724     i_pix_pitch = 2;
 725     i_dst_pitch = p_dst_pic->p->i_pitch;
 726     p_dst = p_dst_pic->p->p_pixels + i_pix_pitch * (i_x_offset +
 727             p_filter->fmt_out.video.i_x_offset) + p_dst_pic->p->i_pitch *
 728             ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 729
 730     i_src1_pitch = p_dst_orig->p->i_pitch;
 731     p_src1 = p_dst_orig->p->p_pixels + i_pix_pitch * (i_x_offset +
 732              p_filter->fmt_out.video.i_x_offset) + p_dst_orig->p->i_pitch *
 733              ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 734
 735     i_src2_pitch = p_src->p->i_pitch;
 736     p_src2 = p_src->p->p_pixels + p_filter->fmt_in.video.i_x_offset +
 737              i_src2_pitch * p_filter->fmt_in.video.i_y_offset;
 738
 739 #define MAX_TRANS 255
 740 #define TRANS_BITS  8
 741 #define p_trans p_src2
 742 #define p_pal p_filter->fmt_in.video.p_palette->palette
 743
 744     /* Draw until we reach the bottom of the subtitle */
 745     for( i_y = 0; i_y < i_height; i_y++,
 746          p_dst += i_dst_pitch, p_src1 += i_src1_pitch, p_src2 += i_src2_pitch )
 747     {
 748         /* Draw until we reach the end of the line */
 749         for( i_x = 0; i_x < i_width; i_x += 2 )
 750         {
 751             i_trans = ( p_pal[p_trans[i_x]][3] * i_alpha ) / 255;
 752             if( !i_trans )
 753             {
 754                 /* Completely transparent. Don't change pixel */
 755             }
 756             else if( i_trans == MAX_TRANS )
 757             {
 758                 /* Completely opaque. Completely overwrite underlying pixel */
 759                 p_dst[i_x * 2]     = p_pal[p_src2[i_x]][0];
 760                 p_dst[i_x * 2 + 1] = p_pal[p_src2[i_x]][1];
 761                 p_dst[i_x * 2 + 3] = p_pal[p_src2[i_x]][2];
 762             }
 763             else
 764             {
 765                 /* Blending */
 766                 p_dst[i_x * 2]     = ( (uint16_t)p_pal[p_src2[i_x]][0] *
 767                     i_trans + (uint16_t)p_src1[i_x * 2] *
 768                     (MAX_TRANS - i_trans) ) >> TRANS_BITS;
 769                 p_dst[i_x * 2 + 1] = ( (uint16_t)p_pal[p_src2[i_x]][1] *
 770                     i_trans + (uint16_t)p_src1[i_x * 2 + 1] *
 771                     (MAX_TRANS - i_trans) ) >> TRANS_BITS;
 772                 p_dst[i_x * 2 + 3] = ( (uint16_t)p_pal[p_src2[i_x]][2] *
 773                     i_trans + (uint16_t)p_src1[i_x * 2 + 3] *
 774                     (MAX_TRANS - i_trans) ) >> TRANS_BITS;
 775             }
 776
 777             i_trans = ( p_pal[p_trans[i_x+1]][3] * i_alpha ) / 255;
 778             if( !i_trans )
 779             {
 780                 /* Completely transparent. Don't change pixel */
 781             }
 782             else if( i_trans == MAX_TRANS )
 783             {
 784                 /* Completely opaque. Completely overwrite underlying pixel */
 785                 p_dst[i_x * 2 + 2] = p_pal[p_src2[i_x + 1]][0];
 786             }
 787             else
 788             {
 789                 /* Blending */
 790                 p_dst[i_x * 2 + 2] = ( (uint16_t)p_pal[p_src2[i_x+1]][0] *
 791                     i_trans + (uint16_t)p_src1[i_x * 2 + 2] *
 792                     (MAX_TRANS - i_trans) ) >> TRANS_BITS;
 793             }
 794         }
 795     }
 796
 797 #undef MAX_TRANS
 798 #undef TRANS_BITS
 799 #undef p_trans
 800 #undef p_pal
 801
 802     return;
 803 }
 804
 805 static void BlendPalRV( filter_t *p_filter, picture_t *p_dst_pic,
 806                         picture_t *p_dst_orig, picture_t *p_src,
 807                         int i_x_offset, int i_y_offset,
 808                         int i_width, int i_height, int i_alpha )
 809 {
 810     int i_src1_pitch, i_src2_pitch, i_dst_pitch;
 811     uint8_t *p_src1, *p_src2, *p_dst;
 812     int i_x, i_y, i_pix_pitch, i_trans;
 813     int r, g, b;
 814     video_palette_t rgbpalette;
 815
 816     i_pix_pitch = p_dst_pic->p->i_pixel_pitch;
 817     i_dst_pitch = p_dst_pic->p->i_pitch;
 818     p_dst = p_dst_pic->p->p_pixels + i_pix_pitch * (i_x_offset +
 819             p_filter->fmt_out.video.i_x_offset) + p_dst_pic->p->i_pitch *
 820             ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 821
 822     i_src1_pitch = p_dst_orig->p->i_pitch;
 823     p_src1 = p_dst_orig->p->p_pixels + i_pix_pitch * (i_x_offset +
 824              p_filter->fmt_out.video.i_x_offset) + p_dst_orig->p->i_pitch *
 825              ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 826
 827     i_src2_pitch = p_src->p->i_pitch;
 828     p_src2 = p_src->p->p_pixels + p_filter->fmt_in.video.i_x_offset +
 829              i_src2_pitch * p_filter->fmt_in.video.i_y_offset;
 830
 831 #define MAX_TRANS 255
 832 #define TRANS_BITS  8
 833 #define p_trans p_src2
 834 #define p_pal p_filter->fmt_in.video.p_palette->palette
 835 #define rgbpal rgbpalette.palette
 836
 837     /* Convert palette first */
 838     for( i_y = 0; i_y < p_filter->fmt_in.video.p_palette->i_entries &&
 839          i_y < 256; i_y++ )
 840     {
 841         yuv_to_rgb( &r, &g, &b, p_pal[i_y][0], p_pal[i_y][1], p_pal[i_y][2] );
 842
 843         if( p_filter->fmt_out.video.i_chroma == VLC_FOURCC('R','V','1','6') )
 844         {
 845             *(uint16_t *)rgbpal[i_y] =
 846                 ((r >> 3) << 11) | ((g >> 2) << 5) | (b >> 3);
 847         }
 848         else
 849         {
 850             rgbpal[i_y][0] = r; rgbpal[i_y][1] = g; rgbpal[i_y][2] = b;
 851         }
 852     }
 853
 854     /* Draw until we reach the bottom of the subtitle */
 855     for( i_y = 0; i_y < i_height; i_y++,
 856          p_dst += i_dst_pitch, p_src1 += i_src1_pitch, p_src2 += i_src2_pitch )
 857     {
 858         /* Draw until we reach the end of the line */
 859         for( i_x = 0; i_x < i_width; i_x++ )
 860         {
 861             i_trans = ( p_pal[p_trans[i_x]][3] * i_alpha ) / 255;
 862             if( !i_trans )
 863             {
 864                 /* Completely transparent. Don't change pixel */
 865                 continue;
 866             }
 867             else if( i_trans == MAX_TRANS ||
 868                      p_filter->fmt_out.video.i_chroma ==
 869                      VLC_FOURCC('R','V','1','6') )
 870             {
 871                 /* Completely opaque. Completely overwrite underlying pixel */
 872                 p_dst[i_x * i_pix_pitch]     = rgbpal[p_src2[i_x]][0];
 873                 p_dst[i_x * i_pix_pitch + 1] = rgbpal[p_src2[i_x]][1];
 874                 if( p_filter->fmt_out.video.i_chroma !=
 875                     VLC_FOURCC('R','V','1','6') )
 876                 p_dst[i_x * i_pix_pitch + 2] = rgbpal[p_src2[i_x]][2];
 877                 continue;
 878             }
 879
 880             /* Blending */
 881             p_dst[i_x * i_pix_pitch]     = ( (uint16_t)rgbpal[p_src2[i_x]][0] *
 882                 i_trans + (uint16_t)p_src1[i_x * i_pix_pitch] *
 883                 (MAX_TRANS - i_trans) ) >> TRANS_BITS;
 884             p_dst[i_x * i_pix_pitch + 1] = ( (uint16_t)rgbpal[p_src2[i_x]][1] *
 885                 i_trans + (uint16_t)p_src1[i_x * i_pix_pitch + 1] *
 886                 (MAX_TRANS - i_trans) ) >> TRANS_BITS;
 887             p_dst[i_x * i_pix_pitch + 2] = ( (uint16_t)rgbpal[p_src2[i_x]][2] *
 888                 i_trans + (uint16_t)p_src1[i_x * i_pix_pitch + 2] *
 889                 (MAX_TRANS - i_trans) ) >> TRANS_BITS;
 890         }
 891     }
 892
 893 #undef MAX_TRANS
 894 #undef TRANS_BITS
 895 #undef p_trans
 896 #undef p_pal
 897 #undef rgbpal
 898
 899     return;
 900 }
 901
 902 /*****************************************************************************
 903  * CloseFilter: clean up the filter
 904  *****************************************************************************/
 905 static void CloseFilter( vlc_object_t *p_this )
 906 {
 907     filter_t *p_filter = (filter_t*)p_this;
 908     filter_sys_t *p_sys = p_filter->p_sys;
 909
 910     free( p_sys );
 911 }