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 static void Blend( filter_t *, picture_t *, picture_t *, picture_t *,
  46                    int, int );
  47 static void BlendI420( filter_t *, picture_t *, picture_t *, picture_t *,
  48                        int, int, int, int );
  49 static void BlendR16( filter_t *, picture_t *, picture_t *, picture_t *,
  50                       int, int, int, int );
  51 static void BlendR24( filter_t *, picture_t *, picture_t *, picture_t *,
  52                       int, int, int, int );
  53 static void BlendYUY2( filter_t *, picture_t *, picture_t *, picture_t *,
  54                        int, int, int, int );
  55 static void BlendPalI420( filter_t *, picture_t *, picture_t *, picture_t *,
  56                           int, int, int, int );
  57 static void BlendPalYUY2( filter_t *, picture_t *, picture_t *, picture_t *,
  58                           int, int, int, int );
  59 static void BlendPalRV( filter_t *, picture_t *, picture_t *, picture_t *,
  60                         int, int, int, int );
  61
  62 /*****************************************************************************
  63  * Module descriptor
  64  *****************************************************************************/
  65 vlc_module_begin();
  66     set_description( _("Video pictures blending") );
  67     set_capability( "video blending", 100 );
  68     set_callbacks( OpenFilter, CloseFilter );
  69 vlc_module_end();
  70
  71 /*****************************************************************************
  72  * OpenFilter: probe the filter and return score
  73  *****************************************************************************/
  74 static int OpenFilter( vlc_object_t *p_this )
  75 {
  76     filter_t *p_filter = (filter_t*)p_this;
  77     filter_sys_t *p_sys;
  78
  79     /* Check if we can handle that format.
  80      * We could try to use a chroma filter if we can't. */
  81     if( ( p_filter->fmt_in.video.i_chroma != VLC_FOURCC('Y','U','V','A') &&
  82           p_filter->fmt_in.video.i_chroma != VLC_FOURCC('Y','U','V','P') ) ||
  83         ( p_filter->fmt_out.video.i_chroma != VLC_FOURCC('I','4','2','0') &&
  84           p_filter->fmt_out.video.i_chroma != VLC_FOURCC('Y','U','Y','2') &&
  85           p_filter->fmt_out.video.i_chroma != VLC_FOURCC('Y','V','1','2') &&
  86           p_filter->fmt_out.video.i_chroma != VLC_FOURCC('R','V','1','6') &&
  87           p_filter->fmt_out.video.i_chroma != VLC_FOURCC('R','V','2','4') &&
  88           p_filter->fmt_out.video.i_chroma != VLC_FOURCC('R','V','3','2') ) )
  89     {
  90         return VLC_EGENERIC;
  91     }
  92
  93     /* Allocate the memory needed to store the decoder's structure */
  94     if( ( p_filter->p_sys = p_sys =
  95           (filter_sys_t *)malloc(sizeof(filter_sys_t)) ) == NULL )
  96     {
  97         msg_Err( p_filter, "out of memory" );
  98         return VLC_EGENERIC;
  99     }
 100
 101     /* Misc init */
 102     p_filter->pf_video_blend = Blend;
 103
 104     msg_Dbg( p_filter, "chroma: %4.4s -> %4.4s",
 105              (char *)&p_filter->fmt_in.video.i_chroma,
 106              (char *)&p_filter->fmt_out.video.i_chroma );
 107
 108
 109     return VLC_SUCCESS;
 110 }
 111
 112 /****************************************************************************
 113  * Blend: the whole thing
 114  ****************************************************************************
 115  * This function is called just after the thread is launched.
 116  ****************************************************************************/
 117 static void Blend( filter_t *p_filter, picture_t *p_dst,
 118                    picture_t *p_dst_orig, picture_t *p_src,
 119                    int i_x_offset, int i_y_offset )
 120 {
 121     int i_width, i_height;
 122
 123     i_width = __MIN((int)p_filter->fmt_out.video.i_visible_width - i_x_offset,
 124                     (int)p_filter->fmt_in.video.i_visible_width);
 125
 126     i_height = __MIN((int)p_filter->fmt_out.video.i_visible_height -i_y_offset,
 127                      (int)p_filter->fmt_in.video.i_visible_height);
 128
 129     if( i_width <= 0 || i_height <= 0 ) return;
 130
 131     if( p_filter->fmt_in.video.i_chroma == VLC_FOURCC('Y','U','V','A') &&
 132         ( p_filter->fmt_out.video.i_chroma == VLC_FOURCC('I','4','2','0') ||
 133           p_filter->fmt_out.video.i_chroma == VLC_FOURCC('Y','V','1','2') ) )
 134     {
 135         BlendI420( p_filter, p_dst, p_dst_orig, p_src,
 136                    i_x_offset, i_y_offset, i_width, i_height );
 137         return;
 138     }
 139     if( p_filter->fmt_in.video.i_chroma == VLC_FOURCC('Y','U','V','A') &&
 140         p_filter->fmt_out.video.i_chroma == VLC_FOURCC('Y','U','Y','2') )
 141     {
 142         BlendYUY2( p_filter, p_dst, p_dst_orig, p_src,
 143                    i_x_offset, i_y_offset, i_width, i_height );
 144         return;
 145     }
 146     if( p_filter->fmt_in.video.i_chroma == VLC_FOURCC('Y','U','V','A') &&
 147         p_filter->fmt_out.video.i_chroma == VLC_FOURCC('R','V','1','6') )
 148     {
 149         BlendR16( p_filter, p_dst, p_dst_orig, p_src,
 150                   i_x_offset, i_y_offset, i_width, i_height );
 151         return;
 152     }
 153     if( p_filter->fmt_in.video.i_chroma == VLC_FOURCC('Y','U','V','A') &&
 154         ( p_filter->fmt_out.video.i_chroma == VLC_FOURCC('R','V','2','4') ||
 155           p_filter->fmt_out.video.i_chroma == VLC_FOURCC('R','V','3','2') ) )
 156     {
 157         BlendR24( p_filter, p_dst, p_dst_orig, p_src,
 158                   i_x_offset, i_y_offset, i_width, i_height );
 159         return;
 160     }
 161     if( p_filter->fmt_in.video.i_chroma == VLC_FOURCC('Y','U','V','P') &&
 162         ( p_filter->fmt_out.video.i_chroma == VLC_FOURCC('I','4','2','0') ||
 163           p_filter->fmt_out.video.i_chroma == VLC_FOURCC('Y','V','1','2') ) )
 164     {
 165         BlendPalI420( p_filter, p_dst, p_dst_orig, p_src,
 166                       i_x_offset, i_y_offset, i_width, i_height );
 167         return;
 168     }
 169     if( p_filter->fmt_in.video.i_chroma == VLC_FOURCC('Y','U','V','P') &&
 170         p_filter->fmt_out.video.i_chroma == VLC_FOURCC('Y','U','Y','2') )
 171     {
 172         BlendPalYUY2( p_filter, p_dst, p_dst_orig, p_src,
 173                       i_x_offset, i_y_offset, i_width, i_height );
 174         return;
 175     }
 176     if( p_filter->fmt_in.video.i_chroma == VLC_FOURCC('Y','U','V','P') &&
 177         ( p_filter->fmt_out.video.i_chroma == VLC_FOURCC('R','V','1','6') ||
 178           p_filter->fmt_out.video.i_chroma == VLC_FOURCC('R','V','2','4') ||
 179           p_filter->fmt_out.video.i_chroma == VLC_FOURCC('R','V','3','2') ) )
 180     {
 181         BlendPalRV( p_filter, p_dst, p_dst_orig, p_src,
 182                     i_x_offset, i_y_offset, i_width, i_height );
 183         return;
 184     }
 185
 186     msg_Dbg( p_filter, "no matching alpha blending routine" );
 187 }
 188
 189 static void BlendI420( filter_t *p_filter, picture_t *p_dst,
 190                        picture_t *p_dst_orig, picture_t *p_src,
 191                        int i_x_offset, int i_y_offset,
 192                        int i_width, int i_height )
 193 {
 194     int i_src1_pitch, i_src2_pitch, i_dst_pitch;
 195     uint8_t *p_src1_y, *p_src2_y, *p_dst_y;
 196     uint8_t *p_src1_u, *p_src2_u, *p_dst_u;
 197     uint8_t *p_src1_v, *p_src2_v, *p_dst_v;
 198     uint8_t *p_trans;
 199     int i_x, i_y;
 200     vlc_bool_t b_even_scanline = i_y_offset % 2;
 201
 202     i_dst_pitch = p_dst->p[Y_PLANE].i_pitch;
 203     p_dst_y = p_dst->p[Y_PLANE].p_pixels + i_x_offset +
 204               p_filter->fmt_out.video.i_x_offset +
 205               p_dst->p[Y_PLANE].i_pitch *
 206               ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 207     p_dst_u = p_dst->p[U_PLANE].p_pixels + i_x_offset/2 +
 208               p_filter->fmt_out.video.i_x_offset/2 +
 209               ( i_y_offset + p_filter->fmt_out.video.i_y_offset ) / 2 *
 210               p_dst->p[U_PLANE].i_pitch;
 211     p_dst_v = p_dst->p[V_PLANE].p_pixels + i_x_offset/2 +
 212               p_filter->fmt_out.video.i_x_offset/2 +
 213               ( i_y_offset + p_filter->fmt_out.video.i_y_offset ) / 2 *
 214               p_dst->p[V_PLANE].i_pitch;
 215
 216     i_src1_pitch = p_dst_orig->p[Y_PLANE].i_pitch;
 217     p_src1_y = p_dst_orig->p[Y_PLANE].p_pixels + i_x_offset +
 218                p_filter->fmt_out.video.i_x_offset +
 219                p_dst_orig->p[Y_PLANE].i_pitch *
 220                ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 221     p_src1_u = p_dst_orig->p[U_PLANE].p_pixels + i_x_offset/2 +
 222                p_filter->fmt_out.video.i_x_offset/2 +
 223                ( i_y_offset + p_filter->fmt_out.video.i_y_offset ) / 2 *
 224                p_dst_orig->p[U_PLANE].i_pitch;
 225     p_src1_v = p_dst_orig->p[V_PLANE].p_pixels + i_x_offset/2 +
 226                p_filter->fmt_out.video.i_x_offset/2 +
 227                ( i_y_offset + p_filter->fmt_out.video.i_y_offset ) / 2 *
 228                p_dst_orig->p[V_PLANE].i_pitch;
 229
 230     i_src2_pitch = p_src->p[Y_PLANE].i_pitch;
 231     p_src2_y = p_src->p[Y_PLANE].p_pixels +
 232                p_filter->fmt_in.video.i_x_offset +
 233                p_src->p[Y_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset;
 234     p_src2_u = p_src->p[U_PLANE].p_pixels +
 235                p_filter->fmt_in.video.i_x_offset/2 +
 236                p_src->p[U_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset/2;
 237     p_src2_v = p_src->p[V_PLANE].p_pixels +
 238                p_filter->fmt_in.video.i_x_offset/2 +
 239                p_src->p[V_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset/2;
 240
 241     p_trans = p_src->p[A_PLANE].p_pixels +
 242               p_filter->fmt_in.video.i_x_offset +
 243               p_src->p[A_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset;
 244
 245 #define MAX_TRANS 255
 246 #define TRANS_BITS  8
 247
 248     /* Draw until we reach the bottom of the subtitle */
 249     for( i_y = 0; i_y < i_height; i_y++, p_trans += i_src2_pitch,
 250          p_dst_y += i_dst_pitch, p_src1_y += i_src1_pitch,
 251          p_src2_y += i_src2_pitch,
 252          p_dst_u += b_even_scanline ? i_dst_pitch/2 : 0,
 253          p_src1_u += b_even_scanline ? i_src1_pitch/2 : 0,
 254          p_src2_u += i_src2_pitch,
 255          p_dst_v += b_even_scanline ? i_dst_pitch/2 : 0,
 256          p_src1_v += b_even_scanline ? i_src1_pitch/2 : 0,
 257          p_src2_v += i_src2_pitch )
 258     {
 259         b_even_scanline = !b_even_scanline;
 260
 261         /* Draw until we reach the end of the line */
 262         for( i_x = 0; i_x < i_width; i_x++ )
 263         {
 264             if( !p_trans[i_x] )
 265             {
 266                 /* Completely transparent. Don't change pixel */
 267                 continue;
 268             }
 269             else if( p_trans[i_x] == MAX_TRANS )
 270             {
 271                 /* Completely opaque. Completely overwrite underlying pixel */
 272                 p_dst_y[i_x] = p_src2_y[i_x];
 273
 274                 if( b_even_scanline && i_x % 2 == 0 )
 275                 {
 276                     p_dst_u[i_x/2] = p_src2_u[i_x];
 277                     p_dst_v[i_x/2] = p_src2_v[i_x];
 278                 }
 279                 continue;
 280             }
 281
 282             /* Blending */
 283             p_dst_y[i_x] = ( (uint16_t)p_src2_y[i_x] * p_trans[i_x] +
 284                 (uint16_t)p_src1_y[i_x] * (MAX_TRANS - p_trans[i_x]) )
 285                 >> TRANS_BITS;
 286
 287             if( b_even_scanline && i_x % 2 == 0 )
 288             {
 289                 p_dst_u[i_x/2] = ( (uint16_t)p_src2_u[i_x] * p_trans[i_x] +
 290                 (uint16_t)p_src1_u[i_x/2] * (MAX_TRANS - p_trans[i_x]) )
 291                 >> TRANS_BITS;
 292                 p_dst_v[i_x/2] = ( (uint16_t)p_src2_v[i_x] * p_trans[i_x] +
 293                 (uint16_t)p_src1_v[i_x/2] * (MAX_TRANS - p_trans[i_x]) )
 294                 >> TRANS_BITS;
 295             }
 296         }
 297     }
 298
 299 #undef MAX_TRANS
 300 #undef TRANS_BITS
 301
 302     return;
 303 }
 304
 305 static inline void yuv_to_rgb( int *r, int *g, int *b,
 306                                uint8_t y1, uint8_t u1, uint8_t v1 )
 307 {
 308     /* macros used for YUV pixel conversions */
 309 #   define SCALEBITS 10
 310 #   define ONE_HALF  (1 << (SCALEBITS - 1))
 311 #   define FIX(x)    ((int) ((x) * (1<<SCALEBITS) + 0.5))
 312 #   define CLAMP( x ) (((x) > 255) ? 255 : ((x) < 0) ? 0 : (x));
 313
 314     int y, cb, cr, r_add, g_add, b_add;
 315
 316     cb = u1 - 128;
 317     cr = v1 - 128;
 318     r_add = FIX(1.40200*255.0/224.0) * cr + ONE_HALF;
 319     g_add = - FIX(0.34414*255.0/224.0) * cb
 320             - FIX(0.71414*255.0/224.0) * cr + ONE_HALF;
 321     b_add = FIX(1.77200*255.0/224.0) * cb + ONE_HALF;
 322     y = (y1 - 16) * FIX(255.0/219.0);
 323     *r = CLAMP((y + r_add) >> SCALEBITS);
 324     *g = CLAMP((y + g_add) >> SCALEBITS);
 325     *b = CLAMP((y + b_add) >> SCALEBITS);
 326 }
 327
 328 static void BlendR16( filter_t *p_filter, picture_t *p_dst_pic,
 329                       picture_t *p_dst_orig, picture_t *p_src,
 330                       int i_x_offset, int i_y_offset,
 331                       int i_width, int i_height )
 332 {
 333     int i_src1_pitch, i_src2_pitch, i_dst_pitch;
 334     uint8_t *p_dst, *p_src1, *p_src2_y;
 335     uint8_t *p_src2_u, *p_src2_v;
 336     uint8_t *p_trans;
 337     int i_x, i_y, i_pix_pitch;
 338     int r, g, b;
 339
 340     i_pix_pitch = p_dst_pic->p->i_pixel_pitch;
 341     i_dst_pitch = p_dst_pic->p->i_pitch;
 342     p_dst = p_dst_pic->p->p_pixels + i_x_offset * i_pix_pitch +
 343             p_filter->fmt_out.video.i_x_offset * i_pix_pitch +
 344             p_dst_pic->p->i_pitch *
 345             ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 346
 347     i_src1_pitch = p_dst_orig->p[Y_PLANE].i_pitch;
 348     p_src1 = p_dst_orig->p->p_pixels + i_x_offset * i_pix_pitch +
 349                p_filter->fmt_out.video.i_x_offset * i_pix_pitch +
 350                p_dst_orig->p->i_pitch *
 351                ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 352
 353     i_src2_pitch = p_src->p[Y_PLANE].i_pitch;
 354     p_src2_y = p_src->p[Y_PLANE].p_pixels +
 355                p_filter->fmt_in.video.i_x_offset +
 356                p_src->p[Y_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset;
 357     p_src2_u = p_src->p[U_PLANE].p_pixels +
 358                p_filter->fmt_in.video.i_x_offset/2 +
 359                p_src->p[U_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset/2;
 360     p_src2_v = p_src->p[V_PLANE].p_pixels +
 361                p_filter->fmt_in.video.i_x_offset/2 +
 362                p_src->p[V_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset/2;
 363
 364     p_trans = p_src->p[A_PLANE].p_pixels +
 365               p_filter->fmt_in.video.i_x_offset +
 366               p_src->p[A_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset;
 367
 368 #define MAX_TRANS 255
 369 #define TRANS_BITS  8
 370
 371     /* Draw until we reach the bottom of the subtitle */
 372     for( i_y = 0; i_y < i_height; i_y++, p_trans += i_src2_pitch,
 373          p_dst += i_dst_pitch, p_src1 += i_src1_pitch,
 374          p_src2_y += i_src2_pitch, p_src2_u += i_src2_pitch,
 375          p_src2_v += i_src2_pitch )
 376     {
 377         /* Draw until we reach the end of the line */
 378         for( i_x = 0; i_x < i_width; i_x++ )
 379         {
 380             if( !p_trans[i_x] )
 381             {
 382                 /* Completely transparent. Don't change pixel */
 383                 continue;
 384             }
 385             else if( p_trans[i_x] == MAX_TRANS )
 386             {
 387                 /* Completely opaque. Completely overwrite underlying pixel */
 388                 yuv_to_rgb( &r, &g, &b,
 389                             p_src2_y[i_x], p_src2_u[i_x], p_src2_v[i_x] );
 390
 391     ((uint16_t *)(&p_dst[i_x * i_pix_pitch]))[0] = ((r >> 3) << 11) | ((g >> 2) << 5) | (b >> 3);
 392                 continue;
 393             }
 394
 395             /* Blending */
 396             yuv_to_rgb( &r, &g, &b,
 397                         p_src2_y[i_x], p_src2_u[i_x], p_src2_v[i_x] );
 398
 399     ((uint16_t *)(&p_dst[i_x * i_pix_pitch]))[0] = ((r >> 3) << 11) | ((g >> 2) << 5) | (b >> 3);
 400         }
 401     }
 402
 403 #undef MAX_TRANS
 404 #undef TRANS_BITS
 405
 406     return;
 407 }
 408
 409 static void BlendR24( filter_t *p_filter, picture_t *p_dst_pic,
 410                       picture_t *p_dst_orig, picture_t *p_src,
 411                       int i_x_offset, int i_y_offset,
 412                       int i_width, int i_height )
 413 {
 414     int i_src1_pitch, i_src2_pitch, i_dst_pitch;
 415     uint8_t *p_dst, *p_src1, *p_src2_y;
 416     uint8_t *p_src2_u, *p_src2_v;
 417     uint8_t *p_trans;
 418     int i_x, i_y, i_pix_pitch;
 419     int r, g, b;
 420
 421     i_pix_pitch = p_dst_pic->p->i_pixel_pitch;
 422     i_dst_pitch = p_dst_pic->p->i_pitch;
 423     p_dst = p_dst_pic->p->p_pixels + i_x_offset * i_pix_pitch +
 424             p_filter->fmt_out.video.i_x_offset * i_pix_pitch +
 425             p_dst_pic->p->i_pitch *
 426             ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 427
 428     i_src1_pitch = p_dst_orig->p[Y_PLANE].i_pitch;
 429     p_src1 = p_dst_orig->p->p_pixels + i_x_offset * i_pix_pitch +
 430                p_filter->fmt_out.video.i_x_offset * i_pix_pitch +
 431                p_dst_orig->p->i_pitch *
 432                ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 433
 434     i_src2_pitch = p_src->p[Y_PLANE].i_pitch;
 435     p_src2_y = p_src->p[Y_PLANE].p_pixels +
 436                p_filter->fmt_in.video.i_x_offset +
 437                p_src->p[Y_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset;
 438     p_src2_u = p_src->p[U_PLANE].p_pixels +
 439                p_filter->fmt_in.video.i_x_offset/2 +
 440                p_src->p[U_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset/2;
 441     p_src2_v = p_src->p[V_PLANE].p_pixels +
 442                p_filter->fmt_in.video.i_x_offset/2 +
 443                p_src->p[V_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset/2;
 444
 445     p_trans = p_src->p[A_PLANE].p_pixels +
 446               p_filter->fmt_in.video.i_x_offset +
 447               p_src->p[A_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset;
 448
 449 #define MAX_TRANS 255
 450 #define TRANS_BITS  8
 451
 452     /* Draw until we reach the bottom of the subtitle */
 453     for( i_y = 0; i_y < i_height; i_y++, p_trans += i_src2_pitch,
 454          p_dst += i_dst_pitch, p_src1 += i_src1_pitch,
 455          p_src2_y += i_src2_pitch, p_src2_u += i_src2_pitch,
 456          p_src2_v += i_src2_pitch )
 457     {
 458         /* Draw until we reach the end of the line */
 459         for( i_x = 0; i_x < i_width; i_x++ )
 460         {
 461             if( !p_trans[i_x] )
 462             {
 463                 /* Completely transparent. Don't change pixel */
 464                 continue;
 465             }
 466             else if( p_trans[i_x] == MAX_TRANS )
 467             {
 468                 /* Completely opaque. Completely overwrite underlying pixel */
 469                 yuv_to_rgb( &r, &g, &b,
 470                             p_src2_y[i_x], p_src2_u[i_x], p_src2_v[i_x] );
 471
 472                 p_dst[i_x * i_pix_pitch]     = r;
 473                 p_dst[i_x * i_pix_pitch + 1] = g;
 474                 p_dst[i_x * i_pix_pitch + 2] = b;
 475                 continue;
 476             }
 477
 478             /* Blending */
 479             yuv_to_rgb( &r, &g, &b,
 480                         p_src2_y[i_x], p_src2_u[i_x], p_src2_v[i_x] );
 481
 482             p_dst[i_x * i_pix_pitch]     = ( r * p_trans[i_x] +
 483                 (uint16_t)p_src1[i_x * i_pix_pitch] *
 484                 (MAX_TRANS - p_trans[i_x]) ) >> TRANS_BITS;
 485             p_dst[i_x * i_pix_pitch + 1] = ( g * p_trans[i_x] +
 486                 (uint16_t)p_src1[i_x * i_pix_pitch + 1] *
 487                 (MAX_TRANS - p_trans[i_x]) ) >> TRANS_BITS;
 488             p_dst[i_x * i_pix_pitch + 2] = ( b * p_trans[i_x] +
 489                 (uint16_t)p_src1[i_x * i_pix_pitch + 2] *
 490                 (MAX_TRANS - p_trans[i_x]) ) >> TRANS_BITS;
 491         }
 492     }
 493
 494 #undef MAX_TRANS
 495 #undef TRANS_BITS
 496
 497     return;
 498 }
 499
 500 static void BlendYUY2( filter_t *p_filter, picture_t *p_dst_pic,
 501                        picture_t *p_dst_orig, picture_t *p_src,
 502                        int i_x_offset, int i_y_offset,
 503                        int i_width, int i_height )
 504 {
 505     int i_src1_pitch, i_src2_pitch, i_dst_pitch;
 506     uint8_t *p_dst, *p_src1, *p_src2_y;
 507     uint8_t *p_src2_u, *p_src2_v;
 508     uint8_t *p_trans;
 509     int i_x, i_y, i_pix_pitch;
 510
 511     i_pix_pitch = 2;
 512     i_dst_pitch = p_dst_pic->p->i_pitch;
 513     p_dst = p_dst_pic->p->p_pixels + i_x_offset * i_pix_pitch +
 514             p_filter->fmt_out.video.i_x_offset * i_pix_pitch +
 515             p_dst_pic->p->i_pitch *
 516             ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 517
 518     i_src1_pitch = p_dst_orig->p[Y_PLANE].i_pitch;
 519     p_src1 = p_dst_orig->p->p_pixels + i_x_offset * i_pix_pitch +
 520                p_filter->fmt_out.video.i_x_offset * i_pix_pitch +
 521                p_dst_orig->p->i_pitch *
 522                ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 523
 524     i_src2_pitch = p_src->p[Y_PLANE].i_pitch;
 525     p_src2_y = p_src->p[Y_PLANE].p_pixels +
 526                p_filter->fmt_in.video.i_x_offset +
 527                p_src->p[Y_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset;
 528     p_src2_u = p_src->p[U_PLANE].p_pixels +
 529                p_filter->fmt_in.video.i_x_offset/2 +
 530                p_src->p[U_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset/2;
 531     p_src2_v = p_src->p[V_PLANE].p_pixels +
 532                p_filter->fmt_in.video.i_x_offset/2 +
 533                p_src->p[V_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset/2;
 534
 535     p_trans = p_src->p[A_PLANE].p_pixels +
 536               p_filter->fmt_in.video.i_x_offset +
 537               p_src->p[A_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset;
 538
 539 #define MAX_TRANS 255
 540 #define TRANS_BITS  8
 541
 542     /* Draw until we reach the bottom of the subtitle */
 543     for( i_y = 0; i_y < i_height; i_y++, p_trans += i_src2_pitch,
 544          p_dst += i_dst_pitch, p_src1 += i_src1_pitch,
 545          p_src2_y += i_src2_pitch, p_src2_u += i_src2_pitch,
 546          p_src2_v += i_src2_pitch )
 547     {
 548         /* Draw until we reach the end of the line */
 549         for( i_x = 0; i_x < i_width; i_x += 2 )
 550         {
 551             if( !p_trans[i_x] )
 552             {
 553                 /* Completely transparent. Don't change pixel */
 554             }
 555             else if( p_trans[i_x] == MAX_TRANS )
 556             {
 557                 /* Completely opaque. Completely overwrite underlying pixel */
 558                 p_dst[i_x * 2]     = p_src2_y[i_x];
 559                 p_dst[i_x * 2 + 1] = p_src2_u[i_x];
 560                 p_dst[i_x * 2 + 3] = p_src2_v[i_x];
 561             }
 562             else
 563             {
 564                 /* Blending */
 565                 p_dst[i_x * 2]     = ( (uint16_t)p_src2_y[i_x] * p_trans[i_x] +
 566                     (uint16_t)p_src1[i_x * 2] *
 567                     (MAX_TRANS - p_trans[i_x]) ) >> TRANS_BITS;
 568                 p_dst[i_x * 2 + 1] = ( (uint16_t)p_src2_u[i_x] * p_trans[i_x] +
 569                     (uint16_t)p_src1[i_x * 2 + 1] *
 570                     (MAX_TRANS - p_trans[i_x]) ) >> TRANS_BITS;
 571                 p_dst[i_x * 2 + 3] = ( (uint16_t)p_src2_v[i_x] * p_trans[i_x] +
 572                     (uint16_t)p_src1[i_x * 2 + 3] *
 573                     (MAX_TRANS - p_trans[i_x]) ) >> TRANS_BITS;
 574             }
 575
 576             if( !p_trans[i_x+1] )
 577             {
 578                 /* Completely transparent. Don't change pixel */
 579             }
 580             else if( p_trans[i_x+1] == MAX_TRANS )
 581             {
 582                 /* Completely opaque. Completely overwrite underlying pixel */
 583                 p_dst[i_x * 2 + 2] = p_src2_y[i_x + 1];
 584             }
 585             else
 586             {
 587                 /* Blending */
 588                 p_dst[i_x * 2 + 2] = ( (uint16_t)p_src2_y[i_x+1] *
 589                     p_trans[i_x+1] + (uint16_t)p_src1[i_x * 2 + 2] *
 590                     (MAX_TRANS - p_trans[i_x+1]) ) >> TRANS_BITS;
 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 )
 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;
 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             if( !p_pal[p_trans[i_x]][3] )
 665             {
 666                 /* Completely transparent. Don't change pixel */
 667                 continue;
 668             }
 669             else if( p_pal[p_trans[i_x]][3] == MAX_TRANS )
 670             {
 671                 /* Completely opaque. Completely overwrite underlying pixel */
 672                 p_dst_y[i_x] = p_pal[p_src2[i_x]][0];
 673
 674                 if( b_even_scanline && i_x % 2 == 0 )
 675                 {
 676                     p_dst_u[i_x/2] = p_pal[p_src2[i_x]][1];
 677                     p_dst_v[i_x/2] = p_pal[p_src2[i_x]][2];
 678                 }
 679                 continue;
 680             }
 681
 682             /* Blending */
 683             p_dst_y[i_x] = ( (uint16_t)p_pal[p_src2[i_x]][0] *
 684                 p_pal[p_trans[i_x]][3] + (uint16_t)p_src1_y[i_x] *
 685                 (MAX_TRANS - p_pal[p_trans[i_x]][3]) ) >> TRANS_BITS;
 686
 687             if( b_even_scanline && i_x % 2 == 0 )
 688             {
 689                 p_dst_u[i_x/2] = ( (uint16_t)p_pal[p_src2[i_x]][1] *
 690                     p_pal[p_trans[i_x]][3] + (uint16_t)p_src1_u[i_x/2] *
 691                     (MAX_TRANS - p_pal[p_trans[i_x]][3]) ) >> TRANS_BITS;
 692                 p_dst_v[i_x/2] = ( (uint16_t)p_pal[p_src2[i_x]][2] *
 693                     p_pal[p_trans[i_x]][3] + (uint16_t)p_src1_v[i_x/2] *
 694                     (MAX_TRANS - p_pal[p_trans[i_x]][3]) ) >> TRANS_BITS;
 695             }
 696         }
 697     }
 698
 699 #undef MAX_TRANS
 700 #undef TRANS_BITS
 701 #undef p_trans
 702 #undef p_pal
 703
 704     return;
 705 }
 706
 707 static void BlendPalYUY2( filter_t *p_filter, picture_t *p_dst_pic,
 708                           picture_t *p_dst_orig, picture_t *p_src,
 709                           int i_x_offset, int i_y_offset,
 710                           int i_width, int i_height )
 711 {
 712     int i_src1_pitch, i_src2_pitch, i_dst_pitch;
 713     uint8_t *p_src1, *p_src2, *p_dst;
 714     int i_x, i_y, i_pix_pitch;
 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 #define MAX_TRANS 255
 732 #define TRANS_BITS  8
 733 #define p_trans p_src2
 734 #define p_pal p_filter->fmt_in.video.p_palette->palette
 735
 736     /* Draw until we reach the bottom of the subtitle */
 737     for( i_y = 0; i_y < i_height; i_y++,
 738          p_dst += i_dst_pitch, p_src1 += i_src1_pitch, p_src2 += i_src2_pitch )
 739     {
 740         /* Draw until we reach the end of the line */
 741         for( i_x = 0; i_x < i_width; i_x += 2 )
 742         {
 743             if( !p_pal[p_trans[i_x]][3] )
 744             {
 745                 /* Completely transparent. Don't change pixel */
 746             }
 747             else if( p_pal[p_trans[i_x]][3] == MAX_TRANS )
 748             {
 749                 /* Completely opaque. Completely overwrite underlying pixel */
 750                 p_dst[i_x * 2]     = p_pal[p_src2[i_x]][0];
 751                 p_dst[i_x * 2 + 1] = p_pal[p_src2[i_x]][1];
 752                 p_dst[i_x * 2 + 3] = p_pal[p_src2[i_x]][2];
 753             }
 754             else
 755             {
 756                 /* Blending */
 757                 p_dst[i_x * 2]     = ( (uint16_t)p_pal[p_src2[i_x]][0] *
 758                     p_pal[p_trans[i_x]][3] + (uint16_t)p_src1[i_x * 2] *
 759                     (MAX_TRANS - p_pal[p_trans[i_x]][3]) ) >> TRANS_BITS;
 760                 p_dst[i_x * 2 + 1] = ( (uint16_t)p_pal[p_src2[i_x]][1] *
 761                     p_pal[p_trans[i_x]][3] + (uint16_t)p_src1[i_x * 2 + 1] *
 762                     (MAX_TRANS - p_pal[p_trans[i_x]][3]) ) >> TRANS_BITS;
 763                 p_dst[i_x * 2 + 3] = ( (uint16_t)p_pal[p_src2[i_x]][2] *
 764                     p_pal[p_trans[i_x]][3] + (uint16_t)p_src1[i_x * 2 + 3] *
 765                     (MAX_TRANS - p_pal[p_trans[i_x]][3]) ) >> TRANS_BITS;
 766             }
 767
 768             if( !p_pal[p_trans[i_x+1]][3] )
 769             {
 770                 /* Completely transparent. Don't change pixel */
 771             }
 772             else if( p_pal[p_trans[i_x+1]][3] == MAX_TRANS )
 773             {
 774                 /* Completely opaque. Completely overwrite underlying pixel */
 775                 p_dst[i_x * 2 + 2] = p_pal[p_src2[i_x + 1]][0];
 776             }
 777             else
 778             {
 779                 /* Blending */
 780                 p_dst[i_x * 2 + 2] = ( (uint16_t)p_pal[p_src2[i_x+1]][0] *
 781                     p_pal[p_trans[i_x+1]][3] + (uint16_t)p_src1[i_x * 2 + 2] *
 782                     (MAX_TRANS - p_pal[p_trans[i_x+1]][3]) ) >> TRANS_BITS;
 783             }
 784         }
 785     }
 786
 787 #undef MAX_TRANS
 788 #undef TRANS_BITS
 789 #undef p_trans
 790 #undef p_pal
 791
 792     return;
 793 }
 794
 795 static void BlendPalRV( filter_t *p_filter, picture_t *p_dst_pic,
 796                         picture_t *p_dst_orig, picture_t *p_src,
 797                         int i_x_offset, int i_y_offset,
 798                         int i_width, int i_height )
 799 {
 800     int i_src1_pitch, i_src2_pitch, i_dst_pitch;
 801     uint8_t *p_src1, *p_src2, *p_dst;
 802     int i_x, i_y, i_pix_pitch;
 803     int r, g, b;
 804     video_palette_t rgbpalette;
 805
 806     i_pix_pitch = p_dst_pic->p->i_pixel_pitch;
 807     i_dst_pitch = p_dst_pic->p->i_pitch;
 808     p_dst = p_dst_pic->p->p_pixels + i_pix_pitch * (i_x_offset +
 809             p_filter->fmt_out.video.i_x_offset) + p_dst_pic->p->i_pitch *
 810             ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 811
 812     i_src1_pitch = p_dst_orig->p->i_pitch;
 813     p_src1 = p_dst_orig->p->p_pixels + i_pix_pitch * (i_x_offset +
 814              p_filter->fmt_out.video.i_x_offset) + p_dst_orig->p->i_pitch *
 815              ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 816
 817     i_src2_pitch = p_src->p->i_pitch;
 818     p_src2 = p_src->p->p_pixels + p_filter->fmt_in.video.i_x_offset +
 819              i_src2_pitch * p_filter->fmt_in.video.i_y_offset;
 820
 821 #define MAX_TRANS 255
 822 #define TRANS_BITS  8
 823 #define p_trans p_src2
 824 #define p_pal p_filter->fmt_in.video.p_palette->palette
 825 #define rgbpal rgbpalette.palette
 826
 827     /* Convert palette first */
 828     for( i_y = 0; i_y < p_filter->fmt_in.video.p_palette->i_entries &&
 829          i_y < 256; i_y++ )
 830     {
 831         yuv_to_rgb( &r, &g, &b, p_pal[i_y][0], p_pal[i_y][1], p_pal[i_y][2] );
 832
 833         if( p_filter->fmt_out.video.i_chroma == VLC_FOURCC('R','V','1','6') )
 834         {
 835             *(uint16_t *)rgbpal[i_y] =
 836                 ((r >> 3) << 11) | ((g >> 2) << 5) | (b >> 3);
 837         }
 838         else
 839         {
 840             rgbpal[i_y][0] = r; rgbpal[i_y][1] = g; rgbpal[i_y][2] = b;
 841         }
 842     }
 843
 844     /* Draw until we reach the bottom of the subtitle */
 845     for( i_y = 0; i_y < i_height; i_y++,
 846          p_dst += i_dst_pitch, p_src1 += i_src1_pitch, p_src2 += i_src2_pitch )
 847     {
 848         /* Draw until we reach the end of the line */
 849         for( i_x = 0; i_x < i_width; i_x++ )
 850         {
 851             if( !p_pal[p_trans[i_x]][3] )
 852             {
 853                 /* Completely transparent. Don't change pixel */
 854                 continue;
 855             }
 856             else if( p_pal[p_trans[i_x]][3] == MAX_TRANS ||
 857                      p_filter->fmt_out.video.i_chroma ==
 858                      VLC_FOURCC('R','V','1','6') )
 859             {
 860                 /* Completely opaque. Completely overwrite underlying pixel */
 861                 p_dst[i_x * i_pix_pitch]     = rgbpal[p_src2[i_x]][0];
 862                 p_dst[i_x * i_pix_pitch + 1] = rgbpal[p_src2[i_x]][1];
 863                 if( p_filter->fmt_out.video.i_chroma !=
 864                     VLC_FOURCC('R','V','1','6') )
 865                 p_dst[i_x * i_pix_pitch + 2] = rgbpal[p_src2[i_x]][2];
 866                 continue;
 867             }
 868
 869             /* Blending */
 870             p_dst[i_x * i_pix_pitch]     = ( (uint16_t)rgbpal[p_src2[i_x]][0] *
 871                 p_pal[p_trans[i_x]][3] +
 872                 (uint16_t)p_src1[i_x * i_pix_pitch] *
 873                 (MAX_TRANS - p_pal[p_trans[i_x]][3]) ) >> TRANS_BITS;
 874             p_dst[i_x * i_pix_pitch + 1] = ( (uint16_t)rgbpal[p_src2[i_x]][1] *
 875                 p_pal[p_trans[i_x]][3] +
 876                 (uint16_t)p_src1[i_x * i_pix_pitch + 1] *
 877                 (MAX_TRANS - p_pal[p_trans[i_x]][3]) ) >> TRANS_BITS;
 878             p_dst[i_x * i_pix_pitch + 2] = ( (uint16_t)rgbpal[p_src2[i_x]][2] *
 879                 p_pal[p_trans[i_x]][3] +
 880                 (uint16_t)p_src1[i_x * i_pix_pitch + 2] *
 881                 (MAX_TRANS - p_pal[p_trans[i_x]][3]) ) >> TRANS_BITS;
 882         }
 883     }
 884
 885 #undef MAX_TRANS
 886 #undef TRANS_BITS
 887 #undef p_trans
 888 #undef p_pal
 889 #undef rgbpal
 890
 891     return;
 892 }
 893
 894 /*****************************************************************************
 895  * CloseFilter: clean up the filter
 896  *****************************************************************************/
 897 static void CloseFilter( vlc_object_t *p_this )
 898 {
 899     filter_t *p_filter = (filter_t*)p_this;
 900     filter_sys_t *p_sys = p_filter->p_sys;
 901
 902     free( p_sys );
 903 }