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_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     vlc_bool_t b_even = !((i_x_offset + p_filter->fmt_out.video.i_x_offset)%2);
 516
 517     i_pix_pitch = 2;
 518     i_dst_pitch = p_dst_pic->p->i_pitch;
 519     p_dst = p_dst_pic->p->p_pixels + i_x_offset * i_pix_pitch +
 520             p_filter->fmt_out.video.i_x_offset * i_pix_pitch +
 521             p_dst_pic->p->i_pitch *
 522             ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 523
 524     i_src1_pitch = p_dst_orig->p[Y_PLANE].i_pitch;
 525     p_src1 = p_dst_orig->p->p_pixels + i_x_offset * i_pix_pitch +
 526                p_filter->fmt_out.video.i_x_offset * i_pix_pitch +
 527                p_dst_orig->p->i_pitch *
 528                ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 529
 530     i_src2_pitch = p_src->p[Y_PLANE].i_pitch;
 531     p_src2_y = p_src->p[Y_PLANE].p_pixels +
 532                p_filter->fmt_in.video.i_x_offset +
 533                p_src->p[Y_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset;
 534     p_src2_u = p_src->p[U_PLANE].p_pixels +
 535                p_filter->fmt_in.video.i_x_offset/2 +
 536                p_src->p[U_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset/2;
 537     p_src2_v = p_src->p[V_PLANE].p_pixels +
 538                p_filter->fmt_in.video.i_x_offset/2 +
 539                p_src->p[V_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset/2;
 540
 541     p_trans = p_src->p[A_PLANE].p_pixels +
 542               p_filter->fmt_in.video.i_x_offset +
 543               p_src->p[A_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset;
 544
 545     i_width = (i_width >> 1) << 1; /* Needs to be a multiple of 2 */
 546
 547 #define MAX_TRANS 255
 548 #define TRANS_BITS  8
 549
 550     /* Draw until we reach the bottom of the subtitle */
 551     for( i_y = 0; i_y < i_height; i_y++, p_trans += i_src2_pitch,
 552          p_dst += i_dst_pitch, p_src1 += i_src1_pitch,
 553          p_src2_y += i_src2_pitch, p_src2_u += i_src2_pitch,
 554          p_src2_v += i_src2_pitch )
 555     {
 556         /* Draw until we reach the end of the line */
 557         for( i_x = 0; i_x < i_width; i_x++, b_even = !b_even )
 558         {
 559             i_trans = ( p_trans[i_x] * i_alpha ) / 255;
 560             if( !i_trans )
 561             {
 562                 /* Completely transparent. Don't change pixel */
 563             }
 564             else if( i_trans == MAX_TRANS )
 565             {
 566                 /* Completely opaque. Completely overwrite underlying pixel */
 567                 p_dst[i_x * 2]     = p_src2_y[i_x];
 568
 569                 if( b_even )
 570                 {
 571                     p_dst[i_x * 2 + 1] = p_src2_u[i_x];
 572                     p_dst[i_x * 2 + 3] = p_src2_v[i_x];
 573                 }
 574             }
 575             else
 576             {
 577                 /* Blending */
 578                 p_dst[i_x * 2]     = ( (uint16_t)p_src2_y[i_x] * i_trans +
 579                     (uint16_t)p_src1[i_x * 2] * (MAX_TRANS - i_trans) )
 580                     >> TRANS_BITS;
 581
 582                 if( b_even )
 583                 {
 584                     p_dst[i_x * 2 + 1] = ( (uint16_t)p_src2_u[i_x] * i_trans +
 585                         (uint16_t)p_src1[i_x * 2 + 1] * (MAX_TRANS - i_trans) )
 586                         >> TRANS_BITS;
 587                     p_dst[i_x * 2 + 3] = ( (uint16_t)p_src2_v[i_x] * i_trans +
 588                         (uint16_t)p_src1[i_x * 2 + 3] * (MAX_TRANS - i_trans) )
 589                         >> TRANS_BITS;
 590                 }
 591             }
 592         }
 593     }
 594
 595 #undef MAX_TRANS
 596 #undef TRANS_BITS
 597
 598     return;
 599 }
 600
 601 static void BlendPalI420( filter_t *p_filter, picture_t *p_dst,
 602                           picture_t *p_dst_orig, picture_t *p_src,
 603                           int i_x_offset, int i_y_offset,
 604                           int i_width, int i_height, int i_alpha )
 605 {
 606     int i_src1_pitch, i_src2_pitch, i_dst_pitch;
 607     uint8_t *p_src1_y, *p_src2, *p_dst_y;
 608     uint8_t *p_src1_u, *p_dst_u;
 609     uint8_t *p_src1_v, *p_dst_v;
 610     int i_x, i_y, i_trans;
 611     vlc_bool_t b_even_scanline = i_y_offset % 2;
 612
 613     i_dst_pitch = p_dst->p[Y_PLANE].i_pitch;
 614     p_dst_y = p_dst->p[Y_PLANE].p_pixels + i_x_offset +
 615               p_filter->fmt_out.video.i_x_offset +
 616               p_dst->p[Y_PLANE].i_pitch *
 617               ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 618     p_dst_u = p_dst->p[U_PLANE].p_pixels + i_x_offset/2 +
 619               p_filter->fmt_out.video.i_x_offset/2 +
 620               ( i_y_offset + p_filter->fmt_out.video.i_y_offset ) / 2 *
 621               p_dst->p[U_PLANE].i_pitch;
 622     p_dst_v = p_dst->p[V_PLANE].p_pixels + i_x_offset/2 +
 623               p_filter->fmt_out.video.i_x_offset/2 +
 624               ( i_y_offset + p_filter->fmt_out.video.i_y_offset ) / 2 *
 625               p_dst->p[V_PLANE].i_pitch;
 626
 627     i_src1_pitch = p_dst_orig->p[Y_PLANE].i_pitch;
 628     p_src1_y = p_dst_orig->p[Y_PLANE].p_pixels + i_x_offset +
 629                p_filter->fmt_out.video.i_x_offset +
 630                p_dst_orig->p[Y_PLANE].i_pitch *
 631                ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 632     p_src1_u = p_dst_orig->p[U_PLANE].p_pixels + i_x_offset/2 +
 633                p_filter->fmt_out.video.i_x_offset/2 +
 634                ( i_y_offset + p_filter->fmt_out.video.i_y_offset ) / 2 *
 635                p_dst_orig->p[U_PLANE].i_pitch;
 636     p_src1_v = p_dst_orig->p[V_PLANE].p_pixels + i_x_offset/2 +
 637                p_filter->fmt_out.video.i_x_offset/2 +
 638                ( i_y_offset + p_filter->fmt_out.video.i_y_offset ) / 2 *
 639                p_dst_orig->p[V_PLANE].i_pitch;
 640
 641     i_src2_pitch = p_src->p->i_pitch;
 642     p_src2 = p_src->p->p_pixels + p_filter->fmt_in.video.i_x_offset +
 643              i_src2_pitch * p_filter->fmt_in.video.i_y_offset;
 644
 645 #define MAX_TRANS 255
 646 #define TRANS_BITS  8
 647 #define p_trans p_src2
 648 #define p_pal p_filter->fmt_in.video.p_palette->palette
 649
 650     /* Draw until we reach the bottom of the subtitle */
 651     for( i_y = 0; i_y < i_height; i_y++,
 652          p_dst_y += i_dst_pitch, p_src1_y += i_src1_pitch,
 653          p_src2 += i_src2_pitch,
 654          p_dst_u += b_even_scanline ? i_dst_pitch/2 : 0,
 655          p_src1_u += b_even_scanline ? i_src1_pitch/2 : 0,
 656          p_dst_v += b_even_scanline ? i_dst_pitch/2 : 0,
 657          p_src1_v += b_even_scanline ? i_src1_pitch/2 : 0 )
 658     {
 659         b_even_scanline = !b_even_scanline;
 660
 661         /* Draw until we reach the end of the line */
 662         for( i_x = 0; i_x < i_width; i_x++ )
 663         {
 664             i_trans = ( p_pal[p_trans[i_x]][3] * i_alpha ) / 255;
 665             if( !i_trans )
 666             {
 667                 /* Completely transparent. Don't change pixel */
 668                 continue;
 669             }
 670             else if( i_trans == MAX_TRANS )
 671             {
 672                 /* Completely opaque. Completely overwrite underlying pixel */
 673                 p_dst_y[i_x] = p_pal[p_src2[i_x]][0];
 674
 675                 if( b_even_scanline && i_x % 2 == 0 )
 676                 {
 677                     p_dst_u[i_x/2] = p_pal[p_src2[i_x]][1];
 678                     p_dst_v[i_x/2] = p_pal[p_src2[i_x]][2];
 679                 }
 680                 continue;
 681             }
 682
 683             /* Blending */
 684             p_dst_y[i_x] = ( (uint16_t)p_pal[p_src2[i_x]][0] * i_trans +
 685                 (uint16_t)p_src1_y[i_x] * (MAX_TRANS - i_trans) )
 686                 >> TRANS_BITS;
 687
 688             if( b_even_scanline && i_x % 2 == 0 )
 689             {
 690                 p_dst_u[i_x/2] = ( (uint16_t)p_pal[p_src2[i_x]][1] * i_trans +
 691                     (uint16_t)p_src1_u[i_x/2] * (MAX_TRANS - i_trans) )
 692                     >> TRANS_BITS;
 693                 p_dst_v[i_x/2] = ( (uint16_t)p_pal[p_src2[i_x]][2] * i_trans +
 694                     (uint16_t)p_src1_v[i_x/2] * (MAX_TRANS - i_trans) )
 695                     >> TRANS_BITS;
 696             }
 697         }
 698     }
 699
 700 #undef MAX_TRANS
 701 #undef TRANS_BITS
 702 #undef p_trans
 703 #undef p_pal
 704
 705     return;
 706 }
 707
 708 static void BlendPalYUY2( filter_t *p_filter, picture_t *p_dst_pic,
 709                           picture_t *p_dst_orig, picture_t *p_src,
 710                           int i_x_offset, int i_y_offset,
 711                           int i_width, int i_height, int i_alpha )
 712 {
 713     int i_src1_pitch, i_src2_pitch, i_dst_pitch;
 714     uint8_t *p_src1, *p_src2, *p_dst;
 715     int i_x, i_y, i_pix_pitch, i_trans;
 716     vlc_bool_t b_even = !((i_x_offset + p_filter->fmt_out.video.i_x_offset)%2);
 717
 718     i_pix_pitch = 2;
 719     i_dst_pitch = p_dst_pic->p->i_pitch;
 720     p_dst = p_dst_pic->p->p_pixels + i_pix_pitch * (i_x_offset +
 721             p_filter->fmt_out.video.i_x_offset) + p_dst_pic->p->i_pitch *
 722             ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 723
 724     i_src1_pitch = p_dst_orig->p->i_pitch;
 725     p_src1 = p_dst_orig->p->p_pixels + i_pix_pitch * (i_x_offset +
 726              p_filter->fmt_out.video.i_x_offset) + p_dst_orig->p->i_pitch *
 727              ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 728
 729     i_src2_pitch = p_src->p->i_pitch;
 730     p_src2 = p_src->p->p_pixels + p_filter->fmt_in.video.i_x_offset +
 731              i_src2_pitch * p_filter->fmt_in.video.i_y_offset;
 732
 733     i_width = (i_width >> 1) << 1; /* Needs to be a multiple of 2 */
 734
 735 #define MAX_TRANS 255
 736 #define TRANS_BITS  8
 737 #define p_trans p_src2
 738 #define p_pal p_filter->fmt_in.video.p_palette->palette
 739
 740     /* Draw until we reach the bottom of the subtitle */
 741     for( i_y = 0; i_y < i_height; i_y++,
 742          p_dst += i_dst_pitch, p_src1 += i_src1_pitch, p_src2 += i_src2_pitch )
 743     {
 744         /* Draw until we reach the end of the line */
 745         for( i_x = 0; i_x < i_width; i_x++, b_even = !b_even )
 746         {
 747             i_trans = ( p_pal[p_trans[i_x]][3] * i_alpha ) / 255;
 748             if( !i_trans )
 749             {
 750                 /* Completely transparent. Don't change pixel */
 751             }
 752             else if( i_trans == MAX_TRANS )
 753             {
 754                 /* Completely opaque. Completely overwrite underlying pixel */
 755                 p_dst[i_x * 2]     = p_pal[p_src2[i_x]][0];
 756
 757                 if( b_even )
 758                 {
 759                     p_dst[i_x * 2 + 1] = p_pal[p_src2[i_x]][1];
 760                     p_dst[i_x * 2 + 3] = p_pal[p_src2[i_x]][2];
 761                 }
 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
 770                 if( b_even )
 771                 {
 772                     p_dst[i_x * 2 + 1] = ( (uint16_t)p_pal[p_src2[i_x]][1] *
 773                         i_trans + (uint16_t)p_src1[i_x * 2 + 1] *
 774                         (MAX_TRANS - i_trans) ) >> TRANS_BITS;
 775                     p_dst[i_x * 2 + 3] = ( (uint16_t)p_pal[p_src2[i_x]][2] *
 776                         i_trans + (uint16_t)p_src1[i_x * 2 + 3] *
 777                         (MAX_TRANS - i_trans) ) >> TRANS_BITS;
 778                 }
 779             }
 780         }
 781     }
 782
 783 #undef MAX_TRANS
 784 #undef TRANS_BITS
 785 #undef p_trans
 786 #undef p_pal
 787
 788     return;
 789 }
 790
 791 static void BlendPalRV( filter_t *p_filter, picture_t *p_dst_pic,
 792                         picture_t *p_dst_orig, picture_t *p_src,
 793                         int i_x_offset, int i_y_offset,
 794                         int i_width, int i_height, int i_alpha )
 795 {
 796     int i_src1_pitch, i_src2_pitch, i_dst_pitch;
 797     uint8_t *p_src1, *p_src2, *p_dst;
 798     int i_x, i_y, i_pix_pitch, i_trans;
 799     int r, g, b;
 800     video_palette_t rgbpalette;
 801
 802     i_pix_pitch = p_dst_pic->p->i_pixel_pitch;
 803     i_dst_pitch = p_dst_pic->p->i_pitch;
 804     p_dst = p_dst_pic->p->p_pixels + i_pix_pitch * (i_x_offset +
 805             p_filter->fmt_out.video.i_x_offset) + p_dst_pic->p->i_pitch *
 806             ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 807
 808     i_src1_pitch = p_dst_orig->p->i_pitch;
 809     p_src1 = p_dst_orig->p->p_pixels + i_pix_pitch * (i_x_offset +
 810              p_filter->fmt_out.video.i_x_offset) + p_dst_orig->p->i_pitch *
 811              ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 812
 813     i_src2_pitch = p_src->p->i_pitch;
 814     p_src2 = p_src->p->p_pixels + p_filter->fmt_in.video.i_x_offset +
 815              i_src2_pitch * p_filter->fmt_in.video.i_y_offset;
 816
 817 #define MAX_TRANS 255
 818 #define TRANS_BITS  8
 819 #define p_trans p_src2
 820 #define p_pal p_filter->fmt_in.video.p_palette->palette
 821 #define rgbpal rgbpalette.palette
 822
 823     /* Convert palette first */
 824     for( i_y = 0; i_y < p_filter->fmt_in.video.p_palette->i_entries &&
 825          i_y < 256; i_y++ )
 826     {
 827         yuv_to_rgb( &r, &g, &b, p_pal[i_y][0], p_pal[i_y][1], p_pal[i_y][2] );
 828
 829         if( p_filter->fmt_out.video.i_chroma == VLC_FOURCC('R','V','1','6') )
 830         {
 831             *(uint16_t *)rgbpal[i_y] =
 832                 ((r >> 3) << 11) | ((g >> 2) << 5) | (b >> 3);
 833         }
 834         else
 835         {
 836             rgbpal[i_y][0] = r; rgbpal[i_y][1] = g; rgbpal[i_y][2] = b;
 837         }
 838     }
 839
 840     /* Draw until we reach the bottom of the subtitle */
 841     for( i_y = 0; i_y < i_height; i_y++,
 842          p_dst += i_dst_pitch, p_src1 += i_src1_pitch, p_src2 += i_src2_pitch )
 843     {
 844         /* Draw until we reach the end of the line */
 845         for( i_x = 0; i_x < i_width; i_x++ )
 846         {
 847             i_trans = ( p_pal[p_trans[i_x]][3] * i_alpha ) / 255;
 848             if( !i_trans )
 849             {
 850                 /* Completely transparent. Don't change pixel */
 851                 continue;
 852             }
 853             else if( i_trans == MAX_TRANS ||
 854                      p_filter->fmt_out.video.i_chroma ==
 855                      VLC_FOURCC('R','V','1','6') )
 856             {
 857                 /* Completely opaque. Completely overwrite underlying pixel */
 858                 p_dst[i_x * i_pix_pitch]     = rgbpal[p_src2[i_x]][0];
 859                 p_dst[i_x * i_pix_pitch + 1] = rgbpal[p_src2[i_x]][1];
 860                 if( p_filter->fmt_out.video.i_chroma !=
 861                     VLC_FOURCC('R','V','1','6') )
 862                 p_dst[i_x * i_pix_pitch + 2] = rgbpal[p_src2[i_x]][2];
 863                 continue;
 864             }
 865
 866             /* Blending */
 867             p_dst[i_x * i_pix_pitch]     = ( (uint16_t)rgbpal[p_src2[i_x]][0] *
 868                 i_trans + (uint16_t)p_src1[i_x * i_pix_pitch] *
 869                 (MAX_TRANS - i_trans) ) >> TRANS_BITS;
 870             p_dst[i_x * i_pix_pitch + 1] = ( (uint16_t)rgbpal[p_src2[i_x]][1] *
 871                 i_trans + (uint16_t)p_src1[i_x * i_pix_pitch + 1] *
 872                 (MAX_TRANS - i_trans) ) >> TRANS_BITS;
 873             p_dst[i_x * i_pix_pitch + 2] = ( (uint16_t)rgbpal[p_src2[i_x]][2] *
 874                 i_trans + (uint16_t)p_src1[i_x * i_pix_pitch + 2] *
 875                 (MAX_TRANS - i_trans) ) >> TRANS_BITS;
 876         }
 877     }
 878
 879 #undef MAX_TRANS
 880 #undef TRANS_BITS
 881 #undef p_trans
 882 #undef p_pal
 883 #undef rgbpal
 884
 885     return;
 886 }
 887
 888 /*****************************************************************************
 889  * CloseFilter: clean up the filter
 890  *****************************************************************************/
 891 static void CloseFilter( vlc_object_t *p_this )
 892 {
 893     filter_t *p_filter = (filter_t*)p_this;
 894     filter_sys_t *p_sys = p_filter->p_sys;
 895
 896     free( p_sys );
 897 }