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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, 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 BlendYUVPacked( 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 BlendPalYUVPacked( filter_t *, picture_t *, picture_t *, picture_t *,
  59                                int, int, int, int, int );
  60 static void BlendPalRV( filter_t *, picture_t *, picture_t *, picture_t *,
  61                         int, int, int, int, int );
  62
  63 /*****************************************************************************
  64  * Module descriptor
  65  *****************************************************************************/
  66 vlc_module_begin();
  67     set_description( _("Video pictures blending") );
  68     set_capability( "video blending", 100 );
  69     set_callbacks( OpenFilter, CloseFilter );
  70 vlc_module_end();
  71
  72 /*****************************************************************************
  73  * OpenFilter: probe the filter and return score
  74  *****************************************************************************/
  75 static int OpenFilter( vlc_object_t *p_this )
  76 {
  77     filter_t *p_filter = (filter_t*)p_this;
  78     filter_sys_t *p_sys;
  79
  80     /* Check if we can handle that format.
  81      * We could try to use a chroma filter if we can't. */
  82     if( ( p_filter->fmt_in.video.i_chroma != VLC_FOURCC('Y','U','V','A') &&
  83           p_filter->fmt_in.video.i_chroma != VLC_FOURCC('Y','U','V','P') ) ||
  84         ( p_filter->fmt_out.video.i_chroma != VLC_FOURCC('I','4','2','0') &&
  85           p_filter->fmt_out.video.i_chroma != VLC_FOURCC('Y','U','Y','2') &&
  86           p_filter->fmt_out.video.i_chroma != VLC_FOURCC('Y','V','1','2') &&
  87           p_filter->fmt_out.video.i_chroma != VLC_FOURCC('U','Y','V','Y') &&
  88           p_filter->fmt_out.video.i_chroma != VLC_FOURCC('Y','V','Y','U') &&
  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           p_filter->fmt_out.video.i_chroma == VLC_FOURCC('U','Y','V','Y') ||
 145           p_filter->fmt_out.video.i_chroma == VLC_FOURCC('Y','V','Y','U') ) )
 146     {
 147         BlendYUVPacked( p_filter, p_dst, p_dst_orig, p_src,
 148                    i_x_offset, i_y_offset, i_width, i_height, i_alpha );
 149         return;
 150     }
 151     if( p_filter->fmt_in.video.i_chroma == VLC_FOURCC('Y','U','V','A') &&
 152         p_filter->fmt_out.video.i_chroma == VLC_FOURCC('R','V','1','6') )
 153     {
 154         BlendR16( p_filter, p_dst, p_dst_orig, p_src,
 155                   i_x_offset, i_y_offset, i_width, i_height, i_alpha );
 156         return;
 157     }
 158     if( p_filter->fmt_in.video.i_chroma == VLC_FOURCC('Y','U','V','A') &&
 159         ( p_filter->fmt_out.video.i_chroma == VLC_FOURCC('R','V','2','4') ||
 160           p_filter->fmt_out.video.i_chroma == VLC_FOURCC('R','V','3','2') ) )
 161     {
 162         BlendR24( p_filter, p_dst, p_dst_orig, p_src,
 163                   i_x_offset, i_y_offset, i_width, i_height, i_alpha );
 164         return;
 165     }
 166     if( p_filter->fmt_in.video.i_chroma == VLC_FOURCC('Y','U','V','P') &&
 167         ( p_filter->fmt_out.video.i_chroma == VLC_FOURCC('I','4','2','0') ||
 168           p_filter->fmt_out.video.i_chroma == VLC_FOURCC('Y','V','1','2') ) )
 169     {
 170         BlendPalI420( p_filter, p_dst, p_dst_orig, p_src,
 171                       i_x_offset, i_y_offset, i_width, i_height, i_alpha );
 172         return;
 173     }
 174     if( p_filter->fmt_in.video.i_chroma == VLC_FOURCC('Y','U','V','P') &&
 175         ( p_filter->fmt_out.video.i_chroma == VLC_FOURCC('Y','U','Y','2') ||
 176           p_filter->fmt_out.video.i_chroma == VLC_FOURCC('U','Y','V','Y') ||
 177           p_filter->fmt_out.video.i_chroma == VLC_FOURCC('Y','V','Y','U') ) )
 178     {
 179         BlendPalYUVPacked( p_filter, p_dst, p_dst_orig, p_src,
 180                       i_x_offset, i_y_offset, i_width, i_height, i_alpha );
 181         return;
 182     }
 183     if( p_filter->fmt_in.video.i_chroma == VLC_FOURCC('Y','U','V','P') &&
 184         ( p_filter->fmt_out.video.i_chroma == VLC_FOURCC('R','V','1','6') ||
 185           p_filter->fmt_out.video.i_chroma == VLC_FOURCC('R','V','2','4') ||
 186           p_filter->fmt_out.video.i_chroma == VLC_FOURCC('R','V','3','2') ) )
 187     {
 188         BlendPalRV( p_filter, p_dst, p_dst_orig, p_src,
 189                     i_x_offset, i_y_offset, i_width, i_height, i_alpha );
 190         return;
 191     }
 192
 193     msg_Dbg( p_filter, "no matching alpha blending routine" );
 194 }
 195
 196 static void BlendI420( filter_t *p_filter, picture_t *p_dst,
 197                        picture_t *p_dst_orig, picture_t *p_src,
 198                        int i_x_offset, int i_y_offset,
 199                        int i_width, int i_height, int i_alpha )
 200 {
 201     int i_src1_pitch, i_src2_pitch, i_dst_pitch;
 202     uint8_t *p_src1_y, *p_src2_y, *p_dst_y;
 203     uint8_t *p_src1_u, *p_src2_u, *p_dst_u;
 204     uint8_t *p_src1_v, *p_src2_v, *p_dst_v;
 205     uint8_t *p_trans;
 206     int i_x, i_y, i_trans;
 207     vlc_bool_t b_even_scanline = i_y_offset % 2;
 208
 209     i_dst_pitch = p_dst->p[Y_PLANE].i_pitch;
 210     p_dst_y = p_dst->p[Y_PLANE].p_pixels + i_x_offset +
 211               p_filter->fmt_out.video.i_x_offset +
 212               p_dst->p[Y_PLANE].i_pitch *
 213               ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 214     p_dst_u = p_dst->p[U_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[U_PLANE].i_pitch;
 218     p_dst_v = p_dst->p[V_PLANE].p_pixels + i_x_offset/2 +
 219               p_filter->fmt_out.video.i_x_offset/2 +
 220               ( i_y_offset + p_filter->fmt_out.video.i_y_offset ) / 2 *
 221               p_dst->p[V_PLANE].i_pitch;
 222
 223     i_src1_pitch = p_dst_orig->p[Y_PLANE].i_pitch;
 224     p_src1_y = p_dst_orig->p[Y_PLANE].p_pixels + i_x_offset +
 225                p_filter->fmt_out.video.i_x_offset +
 226                p_dst_orig->p[Y_PLANE].i_pitch *
 227                ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 228     p_src1_u = p_dst_orig->p[U_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[U_PLANE].i_pitch;
 232     p_src1_v = p_dst_orig->p[V_PLANE].p_pixels + i_x_offset/2 +
 233                p_filter->fmt_out.video.i_x_offset/2 +
 234                ( i_y_offset + p_filter->fmt_out.video.i_y_offset ) / 2 *
 235                p_dst_orig->p[V_PLANE].i_pitch;
 236
 237     i_src2_pitch = p_src->p[Y_PLANE].i_pitch;
 238     p_src2_y = p_src->p[Y_PLANE].p_pixels +
 239                p_filter->fmt_in.video.i_x_offset +
 240                p_src->p[Y_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset;
 241     p_src2_u = p_src->p[U_PLANE].p_pixels +
 242                p_filter->fmt_in.video.i_x_offset/2 +
 243                p_src->p[U_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset/2;
 244     p_src2_v = p_src->p[V_PLANE].p_pixels +
 245                p_filter->fmt_in.video.i_x_offset/2 +
 246                p_src->p[V_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset/2;
 247
 248     p_trans = p_src->p[A_PLANE].p_pixels +
 249               p_filter->fmt_in.video.i_x_offset +
 250               p_src->p[A_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset;
 251
 252 #define MAX_TRANS 255
 253 #define TRANS_BITS  8
 254
 255     /* Draw until we reach the bottom of the subtitle */
 256     for( i_y = 0; i_y < i_height; i_y++, p_trans += i_src2_pitch,
 257          p_dst_y += i_dst_pitch, p_src1_y += i_src1_pitch,
 258          p_src2_y += i_src2_pitch,
 259          p_dst_u += b_even_scanline ? i_dst_pitch/2 : 0,
 260          p_src1_u += b_even_scanline ? i_src1_pitch/2 : 0,
 261          p_src2_u += i_src2_pitch,
 262          p_dst_v += b_even_scanline ? i_dst_pitch/2 : 0,
 263          p_src1_v += b_even_scanline ? i_src1_pitch/2 : 0,
 264          p_src2_v += i_src2_pitch )
 265     {
 266         b_even_scanline = !b_even_scanline;
 267
 268         /* Draw until we reach the end of the line */
 269         for( i_x = 0; i_x < i_width; i_x++ )
 270         {
 271             i_trans = ( p_trans[i_x] * i_alpha ) / 255;
 272             if( !i_trans )
 273             {
 274                 /* Completely transparent. Don't change pixel */
 275                 continue;
 276             }
 277             else if( i_trans == MAX_TRANS )
 278             {
 279                 /* Completely opaque. Completely overwrite underlying pixel */
 280                 p_dst_y[i_x] = p_src2_y[i_x];
 281
 282                 if( b_even_scanline && i_x % 2 == 0 )
 283                 {
 284                     p_dst_u[i_x/2] = p_src2_u[i_x];
 285                     p_dst_v[i_x/2] = p_src2_v[i_x];
 286                 }
 287                 continue;
 288             }
 289
 290             /* Blending */
 291             p_dst_y[i_x] = ( (uint16_t)p_src2_y[i_x] * i_trans +
 292                 (uint16_t)p_src1_y[i_x] * (MAX_TRANS - i_trans) )
 293                 >> TRANS_BITS;
 294
 295             if( b_even_scanline && i_x % 2 == 0 )
 296             {
 297                 p_dst_u[i_x/2] = ( (uint16_t)p_src2_u[i_x] * i_trans +
 298                 (uint16_t)p_src1_u[i_x/2] * (MAX_TRANS - i_trans) )
 299                 >> TRANS_BITS;
 300                 p_dst_v[i_x/2] = ( (uint16_t)p_src2_v[i_x] * i_trans +
 301                 (uint16_t)p_src1_v[i_x/2] * (MAX_TRANS - i_trans) )
 302                 >> TRANS_BITS;
 303             }
 304         }
 305     }
 306
 307 #undef MAX_TRANS
 308 #undef TRANS_BITS
 309
 310     return;
 311 }
 312
 313 static inline void yuv_to_rgb( int *r, int *g, int *b,
 314                                uint8_t y1, uint8_t u1, uint8_t v1 )
 315 {
 316     /* macros used for YUV pixel conversions */
 317 #   define SCALEBITS 10
 318 #   define ONE_HALF  (1 << (SCALEBITS - 1))
 319 #   define FIX(x)    ((int) ((x) * (1<<SCALEBITS) + 0.5))
 320 #   define CLAMP( x ) (((x) > 255) ? 255 : ((x) < 0) ? 0 : (x));
 321
 322     int y, cb, cr, r_add, g_add, b_add;
 323
 324     cb = u1 - 128;
 325     cr = v1 - 128;
 326     r_add = FIX(1.40200*255.0/224.0) * cr + ONE_HALF;
 327     g_add = - FIX(0.34414*255.0/224.0) * cb
 328             - FIX(0.71414*255.0/224.0) * cr + ONE_HALF;
 329     b_add = FIX(1.77200*255.0/224.0) * cb + ONE_HALF;
 330     y = (y1 - 16) * FIX(255.0/219.0);
 331     *r = CLAMP((y + r_add) >> SCALEBITS);
 332     *g = CLAMP((y + g_add) >> SCALEBITS);
 333     *b = CLAMP((y + b_add) >> SCALEBITS);
 334 }
 335
 336 static void BlendR16( filter_t *p_filter, picture_t *p_dst_pic,
 337                       picture_t *p_dst_orig, picture_t *p_src,
 338                       int i_x_offset, int i_y_offset,
 339                       int i_width, int i_height, int i_alpha )
 340 {
 341     int i_src1_pitch, i_src2_pitch, i_dst_pitch;
 342     uint8_t *p_dst, *p_src1, *p_src2_y;
 343     uint8_t *p_src2_u, *p_src2_v;
 344     uint8_t *p_trans;
 345     int i_x, i_y, i_pix_pitch;
 346     int r, g, b;
 347
 348     i_pix_pitch = p_dst_pic->p->i_pixel_pitch;
 349     i_dst_pitch = p_dst_pic->p->i_pitch;
 350     p_dst = p_dst_pic->p->p_pixels + i_x_offset * i_pix_pitch +
 351             p_filter->fmt_out.video.i_x_offset * i_pix_pitch +
 352             p_dst_pic->p->i_pitch *
 353             ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 354
 355     i_src1_pitch = p_dst_orig->p[Y_PLANE].i_pitch;
 356     p_src1 = p_dst_orig->p->p_pixels + i_x_offset * i_pix_pitch +
 357                p_filter->fmt_out.video.i_x_offset * i_pix_pitch +
 358                p_dst_orig->p->i_pitch *
 359                ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 360
 361     i_src2_pitch = p_src->p[Y_PLANE].i_pitch;
 362     p_src2_y = p_src->p[Y_PLANE].p_pixels +
 363                p_filter->fmt_in.video.i_x_offset +
 364                p_src->p[Y_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset;
 365     p_src2_u = p_src->p[U_PLANE].p_pixels +
 366                p_filter->fmt_in.video.i_x_offset/2 +
 367                p_src->p[U_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset/2;
 368     p_src2_v = p_src->p[V_PLANE].p_pixels +
 369                p_filter->fmt_in.video.i_x_offset/2 +
 370                p_src->p[V_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset/2;
 371
 372     p_trans = p_src->p[A_PLANE].p_pixels +
 373               p_filter->fmt_in.video.i_x_offset +
 374               p_src->p[A_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset;
 375
 376 #define MAX_TRANS 255
 377 #define TRANS_BITS  8
 378
 379     /* Draw until we reach the bottom of the subtitle */
 380     for( i_y = 0; i_y < i_height; i_y++, p_trans += i_src2_pitch,
 381          p_dst += i_dst_pitch, p_src1 += i_src1_pitch,
 382          p_src2_y += i_src2_pitch, p_src2_u += i_src2_pitch,
 383          p_src2_v += i_src2_pitch )
 384     {
 385         /* Draw until we reach the end of the line */
 386         for( i_x = 0; i_x < i_width; i_x++ )
 387         {
 388             if( !p_trans[i_x] )
 389             {
 390                 /* Completely transparent. Don't change pixel */
 391                 continue;
 392             }
 393             else if( p_trans[i_x] == MAX_TRANS )
 394             {
 395                 /* Completely opaque. Completely overwrite underlying pixel */
 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                 continue;
 401             }
 402
 403             /* Blending */
 404             yuv_to_rgb( &r, &g, &b,
 405                         p_src2_y[i_x], p_src2_u[i_x], p_src2_v[i_x] );
 406
 407     ((uint16_t *)(&p_dst[i_x * i_pix_pitch]))[0] = ((r >> 3) << 11) | ((g >> 2) << 5) | (b >> 3);
 408         }
 409     }
 410
 411 #undef MAX_TRANS
 412 #undef TRANS_BITS
 413
 414     return;
 415 }
 416
 417 static void BlendR24( filter_t *p_filter, picture_t *p_dst_pic,
 418                       picture_t *p_dst_orig, picture_t *p_src,
 419                       int i_x_offset, int i_y_offset,
 420                       int i_width, int i_height, int i_alpha )
 421 {
 422     int i_src1_pitch, i_src2_pitch, i_dst_pitch;
 423     uint8_t *p_dst, *p_src1, *p_src2_y;
 424     uint8_t *p_src2_u, *p_src2_v;
 425     uint8_t *p_trans;
 426     int i_x, i_y, i_pix_pitch, i_trans;
 427     int r, g, b;
 428
 429     i_pix_pitch = p_dst_pic->p->i_pixel_pitch;
 430     i_dst_pitch = p_dst_pic->p->i_pitch;
 431     p_dst = p_dst_pic->p->p_pixels + i_x_offset * i_pix_pitch +
 432             p_filter->fmt_out.video.i_x_offset * i_pix_pitch +
 433             p_dst_pic->p->i_pitch *
 434             ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 435
 436     i_src1_pitch = p_dst_orig->p[Y_PLANE].i_pitch;
 437     p_src1 = p_dst_orig->p->p_pixels + i_x_offset * i_pix_pitch +
 438                p_filter->fmt_out.video.i_x_offset * i_pix_pitch +
 439                p_dst_orig->p->i_pitch *
 440                ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 441
 442     i_src2_pitch = p_src->p[Y_PLANE].i_pitch;
 443     p_src2_y = p_src->p[Y_PLANE].p_pixels +
 444                p_filter->fmt_in.video.i_x_offset +
 445                p_src->p[Y_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset;
 446     p_src2_u = p_src->p[U_PLANE].p_pixels +
 447                p_filter->fmt_in.video.i_x_offset/2 +
 448                p_src->p[U_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset/2;
 449     p_src2_v = p_src->p[V_PLANE].p_pixels +
 450                p_filter->fmt_in.video.i_x_offset/2 +
 451                p_src->p[V_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset/2;
 452
 453     p_trans = p_src->p[A_PLANE].p_pixels +
 454               p_filter->fmt_in.video.i_x_offset +
 455               p_src->p[A_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset;
 456
 457 #define MAX_TRANS 255
 458 #define TRANS_BITS  8
 459
 460     /* Draw until we reach the bottom of the subtitle */
 461     for( i_y = 0; i_y < i_height; i_y++, p_trans += i_src2_pitch,
 462          p_dst += i_dst_pitch, p_src1 += i_src1_pitch,
 463          p_src2_y += i_src2_pitch, p_src2_u += i_src2_pitch,
 464          p_src2_v += i_src2_pitch )
 465     {
 466         /* Draw until we reach the end of the line */
 467         for( i_x = 0; i_x < i_width; i_x++ )
 468         {
 469             i_trans = ( p_trans[i_x] * i_alpha ) / 255;
 470             if( !i_trans )
 471             {
 472                 /* Completely transparent. Don't change pixel */
 473                 continue;
 474             }
 475             else if( i_trans == MAX_TRANS )
 476             {
 477                 /* Completely opaque. Completely overwrite underlying pixel */
 478                 yuv_to_rgb( &r, &g, &b,
 479                             p_src2_y[i_x], p_src2_u[i_x], p_src2_v[i_x] );
 480
 481                 p_dst[i_x * i_pix_pitch]     = r;
 482                 p_dst[i_x * i_pix_pitch + 1] = g;
 483                 p_dst[i_x * i_pix_pitch + 2] = b;
 484                 continue;
 485             }
 486
 487             /* Blending */
 488             yuv_to_rgb( &r, &g, &b,
 489                         p_src2_y[i_x], p_src2_u[i_x], p_src2_v[i_x] );
 490
 491             p_dst[i_x * i_pix_pitch]     = ( r * i_trans +
 492                 (uint16_t)p_src1[i_x * i_pix_pitch] *
 493                 (MAX_TRANS - i_trans) ) >> TRANS_BITS;
 494             p_dst[i_x * i_pix_pitch + 1] = ( g * i_trans +
 495                 (uint16_t)p_src1[i_x * i_pix_pitch + 1] *
 496                 (MAX_TRANS - i_trans) ) >> TRANS_BITS;
 497             p_dst[i_x * i_pix_pitch + 2] = ( b * i_trans +
 498                 (uint16_t)p_src1[i_x * i_pix_pitch + 2] *
 499                 (MAX_TRANS - i_trans) ) >> TRANS_BITS;
 500         }
 501     }
 502
 503 #undef MAX_TRANS
 504 #undef TRANS_BITS
 505
 506     return;
 507 }
 508
 509 static void BlendYUVPacked( filter_t *p_filter, picture_t *p_dst_pic,
 510                             picture_t *p_dst_orig, picture_t *p_src,
 511                             int i_x_offset, int i_y_offset,
 512                             int i_width, int i_height, int i_alpha )
 513 {
 514     int i_src1_pitch, i_src2_pitch, i_dst_pitch;
 515     uint8_t *p_dst, *p_src1, *p_src2_y;
 516     uint8_t *p_src2_u, *p_src2_v;
 517     uint8_t *p_trans;
 518     int i_x, i_y, i_pix_pitch, i_trans;
 519     vlc_bool_t b_even = !((i_x_offset + p_filter->fmt_out.video.i_x_offset)%2);
 520     int i_l_offset = 0, i_u_offset = 0, i_v_offset = 0;
 521
 522     if( p_filter->fmt_out.video.i_chroma == VLC_FOURCC('Y','U','Y','2') )
 523     {
 524         i_l_offset = 0;
 525         i_u_offset = 1;
 526         i_v_offset = 3;
 527     }
 528     else if( p_filter->fmt_out.video.i_chroma == VLC_FOURCC('U','Y','V','Y') )
 529     {
 530         i_l_offset = 1;
 531         i_u_offset = 0;
 532         i_v_offset = 2;
 533     }
 534     else if( p_filter->fmt_out.video.i_chroma == VLC_FOURCC('Y','V','Y','U') )
 535     {
 536         i_l_offset = 0;
 537         i_u_offset = 3;
 538         i_v_offset = 1;
 539     }
 540
 541     i_pix_pitch = 2;
 542     i_dst_pitch = p_dst_pic->p->i_pitch;
 543     p_dst = p_dst_pic->p->p_pixels + i_x_offset * i_pix_pitch +
 544             p_filter->fmt_out.video.i_x_offset * i_pix_pitch +
 545             p_dst_pic->p->i_pitch *
 546             ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 547
 548     i_src1_pitch = p_dst_orig->p[Y_PLANE].i_pitch;
 549     p_src1 = p_dst_orig->p->p_pixels + i_x_offset * i_pix_pitch +
 550                p_filter->fmt_out.video.i_x_offset * i_pix_pitch +
 551                p_dst_orig->p->i_pitch *
 552                ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 553
 554     i_src2_pitch = p_src->p[Y_PLANE].i_pitch;
 555     p_src2_y = p_src->p[Y_PLANE].p_pixels +
 556                p_filter->fmt_in.video.i_x_offset +
 557                p_src->p[Y_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset;
 558     p_src2_u = p_src->p[U_PLANE].p_pixels +
 559                p_filter->fmt_in.video.i_x_offset/2 +
 560                p_src->p[U_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset/2;
 561     p_src2_v = p_src->p[V_PLANE].p_pixels +
 562                p_filter->fmt_in.video.i_x_offset/2 +
 563                p_src->p[V_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset/2;
 564
 565     p_trans = p_src->p[A_PLANE].p_pixels +
 566               p_filter->fmt_in.video.i_x_offset +
 567               p_src->p[A_PLANE].i_pitch * p_filter->fmt_in.video.i_y_offset;
 568
 569     i_width = (i_width >> 1) << 1; /* Needs to be a multiple of 2 */
 570
 571 #define MAX_TRANS 255
 572 #define TRANS_BITS  8
 573
 574     /* Draw until we reach the bottom of the subtitle */
 575     for( i_y = 0; i_y < i_height; i_y++, p_trans += i_src2_pitch,
 576          p_dst += i_dst_pitch, p_src1 += i_src1_pitch,
 577          p_src2_y += i_src2_pitch, p_src2_u += i_src2_pitch,
 578          p_src2_v += i_src2_pitch )
 579     {
 580         /* Draw until we reach the end of the line */
 581         for( i_x = 0; i_x < i_width; i_x++, b_even = !b_even )
 582         {
 583             i_trans = ( p_trans[i_x] * i_alpha ) / 255;
 584             if( !i_trans )
 585             {
 586                 /* Completely transparent. Don't change pixel */
 587             }
 588             else if( i_trans == MAX_TRANS )
 589             {
 590                 /* Completely opaque. Completely overwrite underlying pixel */
 591                 p_dst[i_x * 2 + i_l_offset]     = p_src2_y[i_x];
 592
 593                 if( b_even )
 594                 {
 595                     p_dst[i_x * 2 + i_u_offset] = p_src2_u[i_x];
 596                     p_dst[i_x * 2 + i_v_offset] = p_src2_v[i_x];
 597                 }
 598             }
 599             else
 600             {
 601                 /* Blending */
 602                 p_dst[i_x * 2 + i_l_offset]     = ( (uint16_t)p_src2_y[i_x] * i_trans +
 603                     (uint16_t)p_src1[i_x * 2 + i_l_offset] * (MAX_TRANS - i_trans) )
 604                     >> TRANS_BITS;
 605
 606                 if( b_even )
 607                 {
 608                     p_dst[i_x * 2 + i_u_offset] = ( (uint16_t)p_src2_u[i_x] * i_trans +
 609                         (uint16_t)p_src1[i_x * 2 + i_u_offset] * (MAX_TRANS - i_trans) )
 610                         >> TRANS_BITS;
 611                     p_dst[i_x * 2 + i_v_offset] = ( (uint16_t)p_src2_v[i_x] * i_trans +
 612                         (uint16_t)p_src1[i_x * 2 + i_v_offset] * (MAX_TRANS - i_trans) )
 613                         >> TRANS_BITS;
 614                 }
 615             }
 616         }
 617     }
 618
 619 #undef MAX_TRANS
 620 #undef TRANS_BITS
 621
 622     return;
 623 }
 624
 625 static void BlendPalI420( filter_t *p_filter, picture_t *p_dst,
 626                           picture_t *p_dst_orig, picture_t *p_src,
 627                           int i_x_offset, int i_y_offset,
 628                           int i_width, int i_height, int i_alpha )
 629 {
 630     int i_src1_pitch, i_src2_pitch, i_dst_pitch;
 631     uint8_t *p_src1_y, *p_src2, *p_dst_y;
 632     uint8_t *p_src1_u, *p_dst_u;
 633     uint8_t *p_src1_v, *p_dst_v;
 634     int i_x, i_y, i_trans;
 635     vlc_bool_t b_even_scanline = i_y_offset % 2;
 636
 637     i_dst_pitch = p_dst->p[Y_PLANE].i_pitch;
 638     p_dst_y = p_dst->p[Y_PLANE].p_pixels + i_x_offset +
 639               p_filter->fmt_out.video.i_x_offset +
 640               p_dst->p[Y_PLANE].i_pitch *
 641               ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 642     p_dst_u = p_dst->p[U_PLANE].p_pixels + i_x_offset/2 +
 643               p_filter->fmt_out.video.i_x_offset/2 +
 644               ( i_y_offset + p_filter->fmt_out.video.i_y_offset ) / 2 *
 645               p_dst->p[U_PLANE].i_pitch;
 646     p_dst_v = p_dst->p[V_PLANE].p_pixels + i_x_offset/2 +
 647               p_filter->fmt_out.video.i_x_offset/2 +
 648               ( i_y_offset + p_filter->fmt_out.video.i_y_offset ) / 2 *
 649               p_dst->p[V_PLANE].i_pitch;
 650
 651     i_src1_pitch = p_dst_orig->p[Y_PLANE].i_pitch;
 652     p_src1_y = p_dst_orig->p[Y_PLANE].p_pixels + i_x_offset +
 653                p_filter->fmt_out.video.i_x_offset +
 654                p_dst_orig->p[Y_PLANE].i_pitch *
 655                ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 656     p_src1_u = p_dst_orig->p[U_PLANE].p_pixels + i_x_offset/2 +
 657                p_filter->fmt_out.video.i_x_offset/2 +
 658                ( i_y_offset + p_filter->fmt_out.video.i_y_offset ) / 2 *
 659                p_dst_orig->p[U_PLANE].i_pitch;
 660     p_src1_v = p_dst_orig->p[V_PLANE].p_pixels + i_x_offset/2 +
 661                p_filter->fmt_out.video.i_x_offset/2 +
 662                ( i_y_offset + p_filter->fmt_out.video.i_y_offset ) / 2 *
 663                p_dst_orig->p[V_PLANE].i_pitch;
 664
 665     i_src2_pitch = p_src->p->i_pitch;
 666     p_src2 = p_src->p->p_pixels + p_filter->fmt_in.video.i_x_offset +
 667              i_src2_pitch * p_filter->fmt_in.video.i_y_offset;
 668
 669 #define MAX_TRANS 255
 670 #define TRANS_BITS  8
 671 #define p_trans p_src2
 672 #define p_pal p_filter->fmt_in.video.p_palette->palette
 673
 674     /* Draw until we reach the bottom of the subtitle */
 675     for( i_y = 0; i_y < i_height; i_y++,
 676          p_dst_y += i_dst_pitch, p_src1_y += i_src1_pitch,
 677          p_src2 += i_src2_pitch,
 678          p_dst_u += b_even_scanline ? i_dst_pitch/2 : 0,
 679          p_src1_u += b_even_scanline ? i_src1_pitch/2 : 0,
 680          p_dst_v += b_even_scanline ? i_dst_pitch/2 : 0,
 681          p_src1_v += b_even_scanline ? i_src1_pitch/2 : 0 )
 682     {
 683         b_even_scanline = !b_even_scanline;
 684
 685         /* Draw until we reach the end of the line */
 686         for( i_x = 0; i_x < i_width; i_x++ )
 687         {
 688             i_trans = ( p_pal[p_trans[i_x]][3] * i_alpha ) / 255;
 689             if( !i_trans )
 690             {
 691                 /* Completely transparent. Don't change pixel */
 692                 continue;
 693             }
 694             else if( i_trans == MAX_TRANS )
 695             {
 696                 /* Completely opaque. Completely overwrite underlying pixel */
 697                 p_dst_y[i_x] = p_pal[p_src2[i_x]][0];
 698
 699                 if( b_even_scanline && i_x % 2 == 0 )
 700                 {
 701                     p_dst_u[i_x/2] = p_pal[p_src2[i_x]][1];
 702                     p_dst_v[i_x/2] = p_pal[p_src2[i_x]][2];
 703                 }
 704                 continue;
 705             }
 706
 707             /* Blending */
 708             p_dst_y[i_x] = ( (uint16_t)p_pal[p_src2[i_x]][0] * i_trans +
 709                 (uint16_t)p_src1_y[i_x] * (MAX_TRANS - i_trans) )
 710                 >> TRANS_BITS;
 711
 712             if( b_even_scanline && i_x % 2 == 0 )
 713             {
 714                 p_dst_u[i_x/2] = ( (uint16_t)p_pal[p_src2[i_x]][1] * i_trans +
 715                     (uint16_t)p_src1_u[i_x/2] * (MAX_TRANS - i_trans) )
 716                     >> TRANS_BITS;
 717                 p_dst_v[i_x/2] = ( (uint16_t)p_pal[p_src2[i_x]][2] * i_trans +
 718                     (uint16_t)p_src1_v[i_x/2] * (MAX_TRANS - i_trans) )
 719                     >> TRANS_BITS;
 720             }
 721         }
 722     }
 723
 724 #undef MAX_TRANS
 725 #undef TRANS_BITS
 726 #undef p_trans
 727 #undef p_pal
 728
 729     return;
 730 }
 731
 732 static void BlendPalYUVPacked( filter_t *p_filter, picture_t *p_dst_pic,
 733                                picture_t *p_dst_orig, picture_t *p_src,
 734                                int i_x_offset, int i_y_offset,
 735                                int i_width, int i_height, int i_alpha )
 736 {
 737     int i_src1_pitch, i_src2_pitch, i_dst_pitch;
 738     uint8_t *p_src1, *p_src2, *p_dst;
 739     int i_x, i_y, i_pix_pitch, i_trans;
 740     vlc_bool_t b_even = !((i_x_offset + p_filter->fmt_out.video.i_x_offset)%2);
 741     int i_l_offset = 0, i_u_offset = 0, i_v_offset = 0;
 742
 743     if( p_filter->fmt_out.video.i_chroma == VLC_FOURCC('Y','U','Y','2') )
 744     {
 745         i_l_offset = 0;
 746         i_u_offset = 1;
 747         i_v_offset = 3;
 748     }
 749     else if( p_filter->fmt_out.video.i_chroma == VLC_FOURCC('U','Y','V','Y') )
 750     {
 751         i_l_offset = 1;
 752         i_u_offset = 0;
 753         i_v_offset = 2;
 754     }
 755     else if( p_filter->fmt_out.video.i_chroma == VLC_FOURCC('Y','V','Y','U') )
 756     {
 757         i_l_offset = 0;
 758         i_u_offset = 3;
 759         i_v_offset = 1;
 760     }
 761
 762     i_pix_pitch = 2;
 763     i_dst_pitch = p_dst_pic->p->i_pitch;
 764     p_dst = p_dst_pic->p->p_pixels + i_pix_pitch * (i_x_offset +
 765             p_filter->fmt_out.video.i_x_offset) + p_dst_pic->p->i_pitch *
 766             ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 767
 768     i_src1_pitch = p_dst_orig->p->i_pitch;
 769     p_src1 = p_dst_orig->p->p_pixels + i_pix_pitch * (i_x_offset +
 770              p_filter->fmt_out.video.i_x_offset) + p_dst_orig->p->i_pitch *
 771              ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 772
 773     i_src2_pitch = p_src->p->i_pitch;
 774     p_src2 = p_src->p->p_pixels + p_filter->fmt_in.video.i_x_offset +
 775              i_src2_pitch * p_filter->fmt_in.video.i_y_offset;
 776
 777     i_width = (i_width >> 1) << 1; /* Needs to be a multiple of 2 */
 778
 779 #define MAX_TRANS 255
 780 #define TRANS_BITS  8
 781 #define p_trans p_src2
 782 #define p_pal p_filter->fmt_in.video.p_palette->palette
 783
 784     /* Draw until we reach the bottom of the subtitle */
 785     for( i_y = 0; i_y < i_height; i_y++,
 786          p_dst += i_dst_pitch, p_src1 += i_src1_pitch, p_src2 += i_src2_pitch )
 787     {
 788         /* Draw until we reach the end of the line */
 789         for( i_x = 0; i_x < i_width; i_x++, b_even = !b_even )
 790         {
 791             i_trans = ( p_pal[p_trans[i_x]][3] * i_alpha ) / 255;
 792             if( !i_trans )
 793             {
 794                 /* Completely transparent. Don't change pixel */
 795             }
 796             else if( i_trans == MAX_TRANS )
 797             {
 798                 /* Completely opaque. Completely overwrite underlying pixel */
 799                 p_dst[i_x * 2 + i_l_offset]     = p_pal[p_src2[i_x]][0];
 800
 801                 if( b_even )
 802                 {
 803                     p_dst[i_x * 2 + i_u_offset] = p_pal[p_src2[i_x]][1];
 804                     p_dst[i_x * 2 + i_v_offset] = p_pal[p_src2[i_x]][2];
 805                 }
 806             }
 807             else
 808             {
 809                 /* Blending */
 810                 p_dst[i_x * 2 + i_l_offset]     = ( (uint16_t)p_pal[p_src2[i_x]][0] *
 811                     i_trans + (uint16_t)p_src1[i_x * 2 + i_l_offset] *
 812                     (MAX_TRANS - i_trans) ) >> TRANS_BITS;
 813
 814                 if( b_even )
 815                 {
 816                     p_dst[i_x * 2 + i_u_offset] = ( (uint16_t)p_pal[p_src2[i_x]][1] *
 817                         i_trans + (uint16_t)p_src1[i_x * 2 + i_u_offset] *
 818                         (MAX_TRANS - i_trans) ) >> TRANS_BITS;
 819                     p_dst[i_x * 2 + i_v_offset] = ( (uint16_t)p_pal[p_src2[i_x]][2] *
 820                         i_trans + (uint16_t)p_src1[i_x * 2 + i_v_offset] *
 821                         (MAX_TRANS - i_trans) ) >> TRANS_BITS;
 822                 }
 823             }
 824         }
 825     }
 826
 827 #undef MAX_TRANS
 828 #undef TRANS_BITS
 829 #undef p_trans
 830 #undef p_pal
 831
 832     return;
 833 }
 834
 835 static void BlendPalRV( filter_t *p_filter, picture_t *p_dst_pic,
 836                         picture_t *p_dst_orig, picture_t *p_src,
 837                         int i_x_offset, int i_y_offset,
 838                         int i_width, int i_height, int i_alpha )
 839 {
 840     int i_src1_pitch, i_src2_pitch, i_dst_pitch;
 841     uint8_t *p_src1, *p_src2, *p_dst;
 842     int i_x, i_y, i_pix_pitch, i_trans;
 843     int r, g, b;
 844     video_palette_t rgbpalette;
 845
 846     i_pix_pitch = p_dst_pic->p->i_pixel_pitch;
 847     i_dst_pitch = p_dst_pic->p->i_pitch;
 848     p_dst = p_dst_pic->p->p_pixels + i_pix_pitch * (i_x_offset +
 849             p_filter->fmt_out.video.i_x_offset) + p_dst_pic->p->i_pitch *
 850             ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 851
 852     i_src1_pitch = p_dst_orig->p->i_pitch;
 853     p_src1 = p_dst_orig->p->p_pixels + i_pix_pitch * (i_x_offset +
 854              p_filter->fmt_out.video.i_x_offset) + p_dst_orig->p->i_pitch *
 855              ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 856
 857     i_src2_pitch = p_src->p->i_pitch;
 858     p_src2 = p_src->p->p_pixels + p_filter->fmt_in.video.i_x_offset +
 859              i_src2_pitch * p_filter->fmt_in.video.i_y_offset;
 860
 861 #define MAX_TRANS 255
 862 #define TRANS_BITS  8
 863 #define p_trans p_src2
 864 #define p_pal p_filter->fmt_in.video.p_palette->palette
 865 #define rgbpal rgbpalette.palette
 866
 867     /* Convert palette first */
 868     for( i_y = 0; i_y < p_filter->fmt_in.video.p_palette->i_entries &&
 869          i_y < 256; i_y++ )
 870     {
 871         yuv_to_rgb( &r, &g, &b, p_pal[i_y][0], p_pal[i_y][1], p_pal[i_y][2] );
 872
 873         if( p_filter->fmt_out.video.i_chroma == VLC_FOURCC('R','V','1','6') )
 874         {
 875             *(uint16_t *)rgbpal[i_y] =
 876                 ((r >> 3) << 11) | ((g >> 2) << 5) | (b >> 3);
 877         }
 878         else
 879         {
 880             rgbpal[i_y][0] = r; rgbpal[i_y][1] = g; rgbpal[i_y][2] = b;
 881         }
 882     }
 883
 884     /* Draw until we reach the bottom of the subtitle */
 885     for( i_y = 0; i_y < i_height; i_y++,
 886          p_dst += i_dst_pitch, p_src1 += i_src1_pitch, p_src2 += i_src2_pitch )
 887     {
 888         /* Draw until we reach the end of the line */
 889         for( i_x = 0; i_x < i_width; i_x++ )
 890         {
 891             i_trans = ( p_pal[p_trans[i_x]][3] * i_alpha ) / 255;
 892             if( !i_trans )
 893             {
 894                 /* Completely transparent. Don't change pixel */
 895                 continue;
 896             }
 897             else if( i_trans == MAX_TRANS ||
 898                      p_filter->fmt_out.video.i_chroma ==
 899                      VLC_FOURCC('R','V','1','6') )
 900             {
 901                 /* Completely opaque. Completely overwrite underlying pixel */
 902                 p_dst[i_x * i_pix_pitch]     = rgbpal[p_src2[i_x]][0];
 903                 p_dst[i_x * i_pix_pitch + 1] = rgbpal[p_src2[i_x]][1];
 904                 if( p_filter->fmt_out.video.i_chroma !=
 905                     VLC_FOURCC('R','V','1','6') )
 906                 p_dst[i_x * i_pix_pitch + 2] = rgbpal[p_src2[i_x]][2];
 907                 continue;
 908             }
 909
 910             /* Blending */
 911             p_dst[i_x * i_pix_pitch]     = ( (uint16_t)rgbpal[p_src2[i_x]][0] *
 912                 i_trans + (uint16_t)p_src1[i_x * i_pix_pitch] *
 913                 (MAX_TRANS - i_trans) ) >> TRANS_BITS;
 914             p_dst[i_x * i_pix_pitch + 1] = ( (uint16_t)rgbpal[p_src2[i_x]][1] *
 915                 i_trans + (uint16_t)p_src1[i_x * i_pix_pitch + 1] *
 916                 (MAX_TRANS - i_trans) ) >> TRANS_BITS;
 917             p_dst[i_x * i_pix_pitch + 2] = ( (uint16_t)rgbpal[p_src2[i_x]][2] *
 918                 i_trans + (uint16_t)p_src1[i_x * i_pix_pitch + 2] *
 919                 (MAX_TRANS - i_trans) ) >> TRANS_BITS;
 920         }
 921     }
 922
 923 #undef MAX_TRANS
 924 #undef TRANS_BITS
 925 #undef p_trans
 926 #undef p_pal
 927 #undef rgbpal
 928
 929     return;
 930 }
 931
 932 /*****************************************************************************
 933  * CloseFilter: clean up the filter
 934  *****************************************************************************/
 935 static void CloseFilter( vlc_object_t *p_this )
 936 {
 937     filter_t *p_filter = (filter_t*)p_this;
 938     filter_sys_t *p_sys = p_filter->p_sys;
 939
 940     free( p_sys );
 941 }