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

   1 /*****************************************************************************
   2  * blend.c: alpha blend 2 pictures together
   3  *****************************************************************************
   4  * Copyright (C) 2003-2009 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Gildas Bazin <gbazin@videolan.org>
   8  *          Antoine Cellerier <dionoea @t videolan dot org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  23  *****************************************************************************/
  24
  25 /*****************************************************************************
  26  * Preamble
  27  *****************************************************************************/
  28 #ifdef HAVE_CONFIG_H
  29 # include "config.h"
  30 #endif
  31
  32 #include <assert.h>
  33 #include <vlc_common.h>
  34 #include <vlc_plugin.h>
  35 #include <vlc_filter.h>
  36 #include "filter_picture.h"
  37
  38 /*****************************************************************************
  39  * Module descriptor
  40  *****************************************************************************/
  41 static int  OpenFilter ( vlc_object_t * );
  42 static void CloseFilter( vlc_object_t * );
  43
  44 vlc_module_begin ()
  45     set_description( N_("Video pictures blending") )
  46     set_capability( "video blending", 100 )
  47     set_callbacks( OpenFilter, CloseFilter )
  48 vlc_module_end ()
  49
  50 /****************************************************************************
  51  * Local prototypes
  52  ****************************************************************************/
  53 static void Blend( filter_t *, picture_t *, const picture_t *,
  54                    int, int, int );
  55
  56 /* YUVA */
  57 static void BlendYUVAI420( filter_t *, picture_t *, const picture_t *,
  58                            int, int, int, int, int );
  59 static void BlendYUVARV16( filter_t *, picture_t *, const picture_t *,
  60                            int, int, int, int, int );
  61 static void BlendYUVARV24( filter_t *, picture_t *, const picture_t *,
  62                            int, int, int, int, int );
  63 static void BlendYUVAYUVPacked( filter_t *, picture_t *, const picture_t *,
  64                                 int, int, int, int, int );
  65
  66 /* I420, YV12 */
  67 static void BlendI420I420( filter_t *, picture_t *, const picture_t *,
  68                            int, int, int, int, int );
  69 static void BlendI420I420_no_alpha(
  70                            filter_t *, picture_t *, const picture_t *,
  71                            int, int, int, int );
  72 static void BlendI420R16( filter_t *, picture_t *, const picture_t *,
  73                            int, int, int, int, int );
  74 static void BlendI420R24( filter_t *, picture_t *, const picture_t *,
  75                           int, int, int, int, int );
  76 static void BlendI420YUVPacked( filter_t *, picture_t *,
  77                                 const picture_t *, int, int, int, int, int );
  78
  79 /* YUVP */
  80 static void BlendPalI420( filter_t *, picture_t *, const picture_t *,
  81                           int, int, int, int, int );
  82 static void BlendPalYUVPacked( filter_t *, picture_t *, const picture_t *,
  83                                int, int, int, int, int );
  84 static void BlendPalRV( filter_t *, picture_t *, const picture_t *,
  85                         int, int, int, int, int );
  86
  87 /* RGBA */
  88 static void BlendRGBAI420( filter_t *, picture_t *, const picture_t *,
  89                            int, int, int, int, int );
  90 static void BlendRGBAYUVPacked( filter_t *, picture_t *,
  91                                 const picture_t *, int, int, int, int, int );
  92 static void BlendRGBAR16( filter_t *, picture_t *, const picture_t *,
  93                           int, int, int, int, int );
  94 static void BlendRGBAR24( filter_t *, picture_t *, const picture_t *,
  95                           int, int, int, int, int );
  96
  97 struct filter_sys_t
  98 {
  99     int i_blendcfg;
 100 };
 101
 102 typedef void (*BlendFunction)( filter_t *,
 103                        picture_t *, const picture_t *,
 104                        int , int , int , int , int );
 105
 106 #define VLC_CODEC_PLANAR_420 { VLC_CODEC_I420, VLC_CODEC_J420, VLC_CODEC_YV12, 0 }
 107 #define VLC_CODEC_PACKED_422 { VLC_CODEC_YUYV, VLC_CODEC_UYVY, VLC_CODEC_YVYU, VLC_CODEC_VYUY, 0 }
 108 #define VLC_CODEC_RGB_16 { VLC_CODEC_RGB15, VLC_CODEC_RGB16, 0 }
 109 #define VLC_CODEC_RGB_24 { VLC_CODEC_RGB24, VLC_CODEC_RGB32, 0 }
 110
 111 #define BLEND_CFG( fccSrc, fctPlanar, fctPacked, fctRgb16, fctRgb24  ) \
 112     { .src = fccSrc, .p_dst = VLC_CODEC_PLANAR_420, .pf_blend = fctPlanar }, \
 113     { .src = fccSrc, .p_dst = VLC_CODEC_PACKED_422, .pf_blend = fctPacked }, \
 114     { .src = fccSrc, .p_dst = VLC_CODEC_RGB_16,     .pf_blend = fctRgb16  }, \
 115     { .src = fccSrc, .p_dst = VLC_CODEC_RGB_24,     .pf_blend = fctRgb24  }
 116
 117 static const struct
 118 {
 119     vlc_fourcc_t src;
 120     vlc_fourcc_t p_dst[16];
 121     BlendFunction pf_blend;
 122 } p_blend_cfg[] = {
 123
 124     BLEND_CFG( VLC_CODEC_YUVA, BlendYUVAI420, BlendYUVAYUVPacked, BlendYUVARV16, BlendYUVARV24 ),
 125
 126     BLEND_CFG( VLC_CODEC_YUVP, BlendPalI420, BlendPalYUVPacked, BlendPalRV, BlendPalRV ),
 127
 128     BLEND_CFG( VLC_CODEC_RGBA, BlendRGBAI420, BlendRGBAYUVPacked, BlendRGBAR16, BlendRGBAR24 ),
 129
 130     BLEND_CFG( VLC_CODEC_I420, BlendI420I420, BlendI420YUVPacked, BlendI420R16, BlendI420R24 ),
 131
 132     BLEND_CFG( VLC_CODEC_YV12, BlendI420I420, BlendI420YUVPacked, BlendI420R16, BlendI420R24 ),
 133
 134     { 0, {0,}, NULL }
 135 };
 136
 137 /*****************************************************************************
 138  * OpenFilter: probe the filter and return score
 139  *****************************************************************************/
 140 static int OpenFilter( vlc_object_t *p_this )
 141 {
 142     filter_t *p_filter = (filter_t*)p_this;
 143     filter_sys_t *p_sys = (filter_sys_t *)malloc( sizeof( filter_sys_t ) );
 144     if( !p_sys )
 145         return VLC_ENOMEM;
 146     p_filter->p_sys = p_sys;
 147     p_filter->p_sys->i_blendcfg = -1;
 148
 149     /* Check if we can handle that format.
 150      * We could try to use a chroma filter if we can't. */
 151     int in_chroma = p_filter->fmt_in.video.i_chroma;
 152     int out_chroma = p_filter->fmt_out.video.i_chroma;
 153
 154     if( ( in_chroma  != VLC_CODEC_YUVA && in_chroma  != VLC_CODEC_I420 &&
 155           in_chroma  != VLC_CODEC_YV12 && in_chroma  != VLC_CODEC_YUVP &&
 156           in_chroma  != VLC_CODEC_RGBA ) ||
 157         ( out_chroma != VLC_CODEC_I420 && out_chroma != VLC_CODEC_J420 &&
 158           out_chroma != VLC_CODEC_YV12 &&
 159           out_chroma != VLC_CODEC_YUYV && out_chroma != VLC_CODEC_YVYU &&
 160           out_chroma != VLC_CODEC_UYVY && out_chroma != VLC_CODEC_VYUY &&
 161           out_chroma != VLC_CODEC_RGB15 &&
 162           out_chroma != VLC_CODEC_RGB16 &&
 163           out_chroma != VLC_CODEC_RGB24 &&
 164           out_chroma != VLC_CODEC_RGB32 ) )
 165     {
 166         return VLC_EGENERIC;
 167     }
 168     for( int i = 0; p_blend_cfg[i].src != 0; i++ )
 169     {
 170         if( p_blend_cfg[i].src != p_filter->fmt_in.video.i_chroma )
 171             continue;
 172         for( int j = 0; p_blend_cfg[i].p_dst[j] != 0; j++ )
 173         {
 174             if( p_blend_cfg[i].p_dst[j] != p_filter->fmt_out.video.i_chroma )
 175                 continue;
 176             p_sys->i_blendcfg = i;
 177         }
 178     }
 179
 180     if( p_sys->i_blendcfg == -1 )
 181     {
 182        msg_Dbg( p_filter, "no matching alpha blending routine "
 183              "(chroma: %4.4s -> %4.4s)",
 184              (char *)&p_filter->fmt_in.video.i_chroma,
 185              (char *)&p_filter->fmt_out.video.i_chroma );
 186       free( p_sys );
 187       return VLC_EGENERIC;
 188    }
 189
 190     /* Misc init */
 191     p_filter->pf_video_blend = Blend;
 192
 193     msg_Dbg( p_filter, "chroma: %4.4s -> %4.4s",
 194              (char *)&p_filter->fmt_in.video.i_chroma,
 195              (char *)&p_filter->fmt_out.video.i_chroma );
 196
 197     return VLC_SUCCESS;
 198 }
 199
 200 /*****************************************************************************
 201  * CloseFilter: clean up the filter
 202  *****************************************************************************/
 203 static void CloseFilter( vlc_object_t *p_this )
 204 {
 205     filter_t *p_filter = (filter_t*)p_this;
 206     free( p_filter->p_sys );
 207 }
 208
 209 /****************************************************************************
 210  * Blend: the whole thing
 211  ****************************************************************************
 212  * This function is called just after the thread is launched.
 213  ****************************************************************************/
 214
 215 static void Blend( filter_t *p_filter,
 216                    picture_t *p_dst, const picture_t *p_src,
 217                    int i_x_offset, int i_y_offset, int i_alpha )
 218 {
 219     int i_width, i_height;
 220
 221     if( i_alpha == 0 )
 222         return;
 223
 224     i_width = __MIN((int)p_filter->fmt_out.video.i_visible_width - i_x_offset,
 225                     (int)p_filter->fmt_in.video.i_visible_width);
 226
 227     i_height = __MIN((int)p_filter->fmt_out.video.i_visible_height -i_y_offset,
 228                      (int)p_filter->fmt_in.video.i_visible_height);
 229
 230     if( i_width <= 0 || i_height <= 0 )
 231         return;
 232
 233     video_format_FixRgb( &p_filter->fmt_out.video );
 234     video_format_FixRgb( &p_filter->fmt_in.video );
 235
 236 #if 0
 237     msg_Dbg( p_filter, "chroma: %4.4s -> %4.4s",
 238              (char *)&p_filter->fmt_in.video.i_chroma,
 239              (char *)&p_filter->fmt_out.video.i_chroma );
 240 #endif
 241
 242
 243     p_blend_cfg[p_filter->p_sys->i_blendcfg].pf_blend( p_filter, p_dst, p_src,
 244                             i_x_offset, i_y_offset,
 245                             i_width, i_height, i_alpha );
 246
 247 }
 248
 249 /***********************************************************************
 250  * Utils
 251  ***********************************************************************/
 252 #define MAX_TRANS 255
 253 #define TRANS_BITS  8
 254
 255 static inline int vlc_blend( int v1, int v2, int a )
 256 {
 257     /* TODO bench if the tests really increase speed */
 258     if( a == 0 )
 259         return v2;
 260     else if( a == MAX_TRANS )
 261         return v1;
 262     return ( v1 * a + v2 * (MAX_TRANS - a ) ) >> TRANS_BITS;
 263 }
 264
 265 static inline int vlc_alpha( int t, int a )
 266 {
 267     if( a == 255 )
 268         return t;
 269     return (t * a) / 255;
 270 }
 271
 272 static uint8_t *vlc_plane_start( int *pi_pitch,
 273                                  const picture_t *p_picture,
 274                                  int i_plane,
 275                                  int i_x_offset, int i_y_offset,
 276                                  const video_format_t *p_fmt,
 277                                  int r )
 278 {
 279     const int i_pitch = p_picture->p[i_plane].i_pitch;
 280     uint8_t *p_pixels = p_picture->p[i_plane].p_pixels;
 281
 282     const int i_dx = ( i_x_offset + p_fmt->i_x_offset ) / r;
 283     const int i_dy = ( i_y_offset + p_fmt->i_y_offset ) / r;
 284
 285     if( pi_pitch )
 286         *pi_pitch = i_pitch;
 287     return &p_pixels[ i_dy * i_pitch + i_dx ];
 288 }
 289
 290 static void vlc_yuv_packed_index( int *pi_y, int *pi_u, int *pi_v, vlc_fourcc_t i_chroma )
 291 {
 292     static const struct {
 293         vlc_fourcc_t chroma;
 294         int y, u ,v;
 295     } p_index[] = {
 296         { VLC_CODEC_YUYV, 0, 1, 3 },
 297         { VLC_CODEC_UYVY, 1, 0, 2 },
 298         { VLC_CODEC_YVYU, 0, 3, 1 },
 299         { VLC_CODEC_VYUY, 1, 2, 0 },
 300         { 0, 0, 0, 0 }
 301     };
 302     int i;
 303
 304     for( i = 0; p_index[i].chroma != 0; i++ )
 305     {
 306         if( p_index[i].chroma == i_chroma )
 307             break;
 308     }
 309     *pi_y = p_index[i].y;
 310     *pi_u = p_index[i].u;
 311     *pi_v = p_index[i].v;
 312 }
 313
 314 static void vlc_blend_packed( uint8_t *p_dst,
 315                               int i_offset0, int i_offset1, int i_offset2,
 316                               int c0, int c1, int c2, int i_alpha,
 317                               bool b_do12 )
 318 {
 319     p_dst[i_offset0] = vlc_blend( c0, p_dst[i_offset0], i_alpha );
 320     if( b_do12 )
 321     {
 322         p_dst[i_offset1] = vlc_blend( c1, p_dst[i_offset1], i_alpha );
 323         p_dst[i_offset2] = vlc_blend( c2, p_dst[i_offset2], i_alpha );
 324     }
 325 }
 326
 327 static void vlc_blend_rgb16( uint16_t *p_dst,
 328                              int R, int G, int B, int i_alpha,
 329                              const video_format_t *p_fmt )
 330 {
 331     const int i_pix = *p_dst;
 332     const int r = ( i_pix & p_fmt->i_rmask ) >> p_fmt->i_lrshift;
 333     const int g = ( i_pix & p_fmt->i_gmask ) >> p_fmt->i_lgshift;
 334     const int b = ( i_pix & p_fmt->i_bmask ) >> p_fmt->i_lbshift;
 335
 336     *p_dst = ( vlc_blend( R >> p_fmt->i_rrshift, r, i_alpha ) << p_fmt->i_lrshift ) |
 337              ( vlc_blend( G >> p_fmt->i_rgshift, g, i_alpha ) << p_fmt->i_lgshift ) |
 338              ( vlc_blend( B >> p_fmt->i_rbshift, b, i_alpha ) << p_fmt->i_lbshift );
 339 }
 340
 341 static void vlc_rgb_index( int *pi_rindex, int *pi_gindex, int *pi_bindex,
 342                            const video_format_t *p_fmt )
 343 {
 344     if( p_fmt->i_chroma != VLC_CODEC_RGB24 && p_fmt->i_chroma != VLC_CODEC_RGB32 )
 345         return;
 346
 347     /* XXX it will works only if mask are 8 bits aligned */
 348 #ifdef WORDS_BIGENDIAN
 349     const int i_mask_bits = p_fmt->i_chroma == VLC_CODEC_RGB24 ? 24 : 32;
 350     *pi_rindex = ( i_mask_bits - p_fmt->i_lrshift ) / 8;
 351     *pi_gindex = ( i_mask_bits - p_fmt->i_lgshift ) / 8;
 352     *pi_bindex = ( i_mask_bits - p_fmt->i_lbshift ) / 8;
 353 #else
 354     *pi_rindex = p_fmt->i_lrshift / 8;
 355     *pi_gindex = p_fmt->i_lgshift / 8;
 356     *pi_bindex = p_fmt->i_lbshift / 8;
 357 #endif
 358 }
 359
 360 /***********************************************************************
 361  * YUVA
 362  ***********************************************************************/
 363 static void BlendYUVAI420( filter_t *p_filter,
 364                            picture_t *p_dst, const picture_t *p_src,
 365                            int i_x_offset, int i_y_offset,
 366                            int i_width, int i_height, int i_alpha )
 367 {
 368     int i_src_pitch, i_dst_pitch;
 369     uint8_t *p_src_y, *p_dst_y;
 370     uint8_t *p_src_u, *p_dst_u;
 371     uint8_t *p_src_v, *p_dst_v;
 372     uint8_t *p_trans;
 373     int i_x, i_y, i_trans = 0;
 374     bool b_even_scanline = i_y_offset % 2;
 375
 376     bool b_swap_up = vlc_fourcc_AreUVPlanesSwapped( p_filter->fmt_out.video.i_chroma,
 377                                                     VLC_CODEC_I420 );
 378     p_dst_y = vlc_plane_start( &i_dst_pitch, p_dst, Y_PLANE,
 379                                i_x_offset, i_y_offset, &p_filter->fmt_out.video, 1 );
 380     p_dst_u = vlc_plane_start( NULL, p_dst, b_swap_up ? V_PLANE : U_PLANE,
 381                                i_x_offset, i_y_offset, &p_filter->fmt_out.video, 2 );
 382     p_dst_v = vlc_plane_start( NULL, p_dst, b_swap_up ? U_PLANE : V_PLANE,
 383                                i_x_offset, i_y_offset, &p_filter->fmt_out.video, 2 );
 384
 385     p_src_y = vlc_plane_start( &i_src_pitch, p_src, Y_PLANE,
 386                                0, 0, &p_filter->fmt_in.video, 1 );
 387     p_src_u = vlc_plane_start( NULL, p_src, U_PLANE,
 388                                0, 0, &p_filter->fmt_in.video, 2 );
 389     p_src_v = vlc_plane_start( NULL, p_src, V_PLANE,
 390                                0, 0, &p_filter->fmt_in.video, 2 );
 391     p_trans = vlc_plane_start( NULL, p_src, A_PLANE,
 392                                0, 0, &p_filter->fmt_in.video, 1 );
 393
 394     /* Draw until we reach the bottom of the subtitle */
 395     for( i_y = 0; i_y < i_height; i_y++, p_trans += i_src_pitch,
 396          p_dst_y += i_dst_pitch, p_src_y += i_src_pitch,
 397          p_dst_u += b_even_scanline ? i_dst_pitch/2 : 0,
 398          p_src_u += i_src_pitch,
 399          p_dst_v += b_even_scanline ? i_dst_pitch/2 : 0,
 400          p_src_v += i_src_pitch )
 401     {
 402         b_even_scanline = !b_even_scanline;
 403
 404         /* Draw until we reach the end of the line */
 405         for( i_x = 0; i_x < i_width; i_x++ )
 406         {
 407             if( p_trans )
 408                 i_trans = vlc_alpha( p_trans[i_x], i_alpha );
 409
 410             if( !i_trans )
 411                 continue;
 412
 413             /* Blending */
 414             p_dst_y[i_x] = vlc_blend( p_src_y[i_x], p_dst_y[i_x], i_trans );
 415             if( b_even_scanline && i_x % 2 == 0 )
 416             {
 417                 p_dst_u[i_x/2] = vlc_blend( p_src_u[i_x], p_dst_u[i_x/2], i_trans );
 418                 p_dst_v[i_x/2] = vlc_blend( p_src_v[i_x], p_dst_v[i_x/2], i_trans );
 419             }
 420         }
 421     }
 422 }
 423
 424 static void BlendYUVARV16( filter_t *p_filter,
 425                            picture_t *p_dst_pic, const picture_t *p_src,
 426                            int i_x_offset, int i_y_offset,
 427                            int i_width, int i_height, int i_alpha )
 428 {
 429     int i_src_pitch, i_dst_pitch;
 430     uint8_t *p_dst, *p_src_y;
 431     uint8_t *p_src_u, *p_src_v;
 432     uint8_t *p_trans;
 433     int i_x, i_y, i_pix_pitch, i_trans = 0;
 434     int r, g, b;
 435
 436     i_pix_pitch = p_dst_pic->p->i_pixel_pitch;
 437     i_dst_pitch = p_dst_pic->p->i_pitch;
 438     p_dst = p_dst_pic->p->p_pixels + i_x_offset * i_pix_pitch +
 439             p_filter->fmt_out.video.i_x_offset * i_pix_pitch +
 440             p_dst_pic->p->i_pitch *
 441             ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 442
 443     p_src_y = vlc_plane_start( &i_src_pitch, p_src, Y_PLANE,
 444                                0, 0, &p_filter->fmt_in.video, 1 );
 445     p_src_u = vlc_plane_start( NULL, p_src, U_PLANE,
 446                                0, 0, &p_filter->fmt_in.video, 2 );
 447     p_src_v = vlc_plane_start( NULL, p_src, V_PLANE,
 448                                0, 0, &p_filter->fmt_in.video, 2 );
 449     p_trans = vlc_plane_start( NULL, p_src, A_PLANE,
 450                                0, 0, &p_filter->fmt_in.video, 1 );
 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_src_pitch,
 454          p_dst += i_dst_pitch,
 455          p_src_y += i_src_pitch, p_src_u += i_src_pitch,
 456          p_src_v += i_src_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 )
 462                 i_trans = vlc_alpha( p_trans[i_x], i_alpha );
 463             if( !i_trans )
 464                 continue;
 465
 466             /* Blending */
 467             yuv_to_rgb( &r, &g, &b,
 468                         p_src_y[i_x], p_src_u[i_x], p_src_v[i_x] );
 469
 470             vlc_blend_rgb16( (uint16_t*)&p_dst[i_x * i_pix_pitch],
 471                              r, g, b, i_trans, &p_filter->fmt_out.video );
 472         }
 473     }
 474 }
 475
 476 static void BlendYUVARV24( filter_t *p_filter,
 477                            picture_t *p_dst_pic, const picture_t *p_src,
 478                            int i_x_offset, int i_y_offset,
 479                            int i_width, int i_height, int i_alpha )
 480 {
 481     int i_src_pitch, i_dst_pitch;
 482     uint8_t *p_dst, *p_src_y;
 483     uint8_t *p_src_u, *p_src_v;
 484     uint8_t *p_trans;
 485     int i_x, i_y, i_pix_pitch, i_trans = 0;
 486     int r, g, b;
 487
 488     i_pix_pitch = p_dst_pic->p->i_pixel_pitch;
 489     i_dst_pitch = p_dst_pic->p->i_pitch;
 490     p_dst = p_dst_pic->p->p_pixels + i_x_offset * i_pix_pitch +
 491             p_filter->fmt_out.video.i_x_offset * i_pix_pitch +
 492             p_dst_pic->p->i_pitch *
 493             ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 494
 495     p_src_y = vlc_plane_start( &i_src_pitch, p_src, Y_PLANE,
 496                                0, 0, &p_filter->fmt_in.video, 1 );
 497     p_src_u = vlc_plane_start( NULL, p_src, U_PLANE,
 498                                0, 0, &p_filter->fmt_in.video, 2 );
 499     p_src_v = vlc_plane_start( NULL, p_src, V_PLANE,
 500                                0, 0, &p_filter->fmt_in.video, 2 );
 501     p_trans = vlc_plane_start( NULL, p_src, A_PLANE,
 502                                0, 0, &p_filter->fmt_in.video, 1 );
 503
 504     if( (i_pix_pitch == 4)
 505      && (((((intptr_t)p_dst)|i_dst_pitch) /* FIXME? */
 506           & 3) == 0) )
 507     {
 508         /*
 509         ** if picture pixels are 32 bits long and lines addresses are 32 bit
 510         ** aligned, optimize rendering
 511         */
 512         uint32_t *p32_dst = (uint32_t *)p_dst;
 513         uint32_t i32_dst_pitch = (uint32_t)(i_dst_pitch>>2);
 514
 515         int i_rshift, i_gshift, i_bshift;
 516         uint32_t i_rmask, i_gmask, i_bmask;
 517
 518         i_rmask = p_filter->fmt_out.video.i_rmask;
 519         i_gmask = p_filter->fmt_out.video.i_gmask;
 520         i_bmask = p_filter->fmt_out.video.i_bmask;
 521         i_rshift = p_filter->fmt_out.video.i_lrshift;
 522         i_gshift = p_filter->fmt_out.video.i_lgshift;
 523         i_bshift = p_filter->fmt_out.video.i_lbshift;
 524
 525         /* Draw until we reach the bottom of the subtitle */
 526         for( i_y = 0; i_y < i_height; i_y++, p_trans += i_src_pitch,
 527              p32_dst += i32_dst_pitch,
 528              p_src_y += i_src_pitch, p_src_u += i_src_pitch,
 529              p_src_v += i_src_pitch )
 530         {
 531             /* Draw until we reach the end of the line */
 532             for( i_x = 0; i_x < i_width; i_x++ )
 533             {
 534                 if( p_trans )
 535                     i_trans = vlc_alpha( p_trans[i_x], i_alpha );
 536                 if( !i_trans )
 537                     continue;
 538
 539                 if( i_trans == MAX_TRANS )
 540                 {
 541                     /* Completely opaque. Completely overwrite underlying pixel */
 542                     yuv_to_rgb( &r, &g, &b,
 543                                 p_src_y[i_x], p_src_u[i_x], p_src_v[i_x] );
 544
 545                     p32_dst[i_x] = (r<<i_rshift) |
 546                                    (g<<i_gshift) |
 547                                    (b<<i_bshift);
 548                 }
 549                 else
 550                 {
 551                     /* Blending */
 552                     uint32_t i_pix_dst = p32_dst[i_x];
 553                     yuv_to_rgb( &r, &g, &b,
 554                                 p_src_y[i_x], p_src_u[i_x], p_src_v[i_x] );
 555
 556                     p32_dst[i_x] = ( vlc_blend( r, (i_pix_dst & i_rmask)>>i_rshift, i_trans ) << i_rshift ) |
 557                                    ( vlc_blend( g, (i_pix_dst & i_gmask)>>i_gshift, i_trans ) << i_gshift ) |
 558                                    ( vlc_blend( b, (i_pix_dst & i_bmask)>>i_bshift, i_trans ) << i_bshift );
 559                 }
 560             }
 561         }
 562     }
 563     else
 564     {
 565         int i_rindex, i_gindex, i_bindex;
 566         vlc_rgb_index( &i_rindex, &i_gindex, &i_bindex, &p_filter->fmt_out.video );
 567
 568         /* Draw until we reach the bottom of the subtitle */
 569         for( i_y = 0; i_y < i_height; i_y++, p_trans += i_src_pitch,
 570              p_dst += i_dst_pitch,
 571              p_src_y += i_src_pitch, p_src_u += i_src_pitch,
 572              p_src_v += i_src_pitch )
 573         {
 574             /* Draw until we reach the end of the line */
 575             for( i_x = 0; i_x < i_width; i_x++ )
 576             {
 577                 if( p_trans )
 578                     i_trans = vlc_alpha( p_trans[i_x], i_alpha );
 579                 if( !i_trans )
 580                     continue;
 581
 582                 /* Blending */
 583                 yuv_to_rgb( &r, &g, &b,
 584                             p_src_y[i_x], p_src_u[i_x], p_src_v[i_x] );
 585
 586                 vlc_blend_packed( &p_dst[ i_x * i_pix_pitch],
 587                                   i_rindex, i_gindex, i_bindex,
 588                                   r, g, b, i_alpha, true );
 589             }
 590         }
 591     }
 592 }
 593
 594 static void BlendYUVAYUVPacked( filter_t *p_filter,
 595                                 picture_t *p_dst_pic, const picture_t *p_src,
 596                                 int i_x_offset, int i_y_offset,
 597                                 int i_width, int i_height, int i_alpha )
 598 {
 599     int i_src_pitch, i_dst_pitch;
 600     uint8_t *p_dst, *p_src_y;
 601     uint8_t *p_src_u, *p_src_v;
 602     uint8_t *p_trans;
 603     int i_x, i_y, i_pix_pitch, i_trans = 0;
 604     bool b_even = !((i_x_offset + p_filter->fmt_out.video.i_x_offset)%2);
 605     int i_l_offset, i_u_offset, i_v_offset;
 606
 607     vlc_yuv_packed_index( &i_l_offset, &i_u_offset, &i_v_offset,
 608                           p_filter->fmt_out.video.i_chroma );
 609
 610     i_pix_pitch = 2;
 611     i_dst_pitch = p_dst_pic->p->i_pitch;
 612     p_dst = p_dst_pic->p->p_pixels + i_x_offset * i_pix_pitch +
 613             p_filter->fmt_out.video.i_x_offset * i_pix_pitch +
 614             p_dst_pic->p->i_pitch *
 615             ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 616
 617     p_src_y = vlc_plane_start( &i_src_pitch, p_src, Y_PLANE,
 618                                0, 0, &p_filter->fmt_in.video, 1 );
 619     p_src_u = vlc_plane_start( NULL, p_src, U_PLANE,
 620                                0, 0, &p_filter->fmt_in.video, 2 );
 621     p_src_v = vlc_plane_start( NULL, p_src, V_PLANE,
 622                                0, 0, &p_filter->fmt_in.video, 2 );
 623     p_trans = vlc_plane_start( NULL, p_src, A_PLANE,
 624                                0, 0, &p_filter->fmt_in.video, 1 );
 625
 626     i_width &= ~1; /* Needs to be a multiple of 2 */
 627
 628     /* Draw until we reach the bottom of the subtitle */
 629     for( i_y = 0; i_y < i_height; i_y++, p_trans += i_src_pitch,
 630          p_dst += i_dst_pitch,
 631          p_src_y += i_src_pitch, p_src_u += i_src_pitch,
 632          p_src_v += i_src_pitch )
 633     {
 634         /* Draw until we reach the end of the line */
 635         for( i_x = 0; i_x < i_width; i_x++, b_even = !b_even )
 636         {
 637             i_trans = vlc_alpha( p_trans[i_x], i_alpha );
 638             if( !i_trans )
 639                 continue;
 640
 641             /* Blending */
 642             if( b_even )
 643             {
 644                 int i_u;
 645                 int i_v;
 646                 /* FIXME what's with 0xaa ? */
 647                 if( p_trans[i_x+1] > 0xaa )
 648                 {
 649                     i_u = (p_src_u[i_x]+p_src_u[i_x+1])>>1;
 650                     i_v = (p_src_v[i_x]+p_src_v[i_x+1])>>1;
 651                 }
 652                 else
 653                 {
 654                     i_u = p_src_u[i_x];
 655                     i_v = p_src_v[i_x];
 656                 }
 657
 658                 vlc_blend_packed( &p_dst[i_x * 2],
 659                                   i_l_offset, i_u_offset, i_v_offset,
 660                                   p_src_y[i_x], i_u, i_v, i_trans, true );
 661             }
 662             else
 663             {
 664                 p_dst[i_x * 2 + i_l_offset] = vlc_blend( p_src_y[i_x], p_dst[i_x * 2 + i_l_offset], i_trans );
 665             }
 666         }
 667     }
 668 }
 669 /***********************************************************************
 670  * I420, YV12
 671  ***********************************************************************/
 672 static void BlendI420I420( filter_t *p_filter,
 673                            picture_t *p_dst, const picture_t *p_src,
 674                            int i_x_offset, int i_y_offset,
 675                            int i_width, int i_height, int i_alpha )
 676 {
 677     int i_src_pitch, i_dst_pitch;
 678     uint8_t *p_src_y, *p_dst_y;
 679     uint8_t *p_src_u, *p_dst_u;
 680     uint8_t *p_src_v, *p_dst_v;
 681     int i_x, i_y;
 682     bool b_even_scanline = i_y_offset % 2;
 683
 684     if( i_alpha == 0xff )
 685     {
 686         BlendI420I420_no_alpha( p_filter, p_dst, p_src,
 687                                 i_x_offset, i_y_offset, i_width, i_height );
 688         return;
 689     }
 690
 691     bool b_swap_up = vlc_fourcc_AreUVPlanesSwapped( p_filter->fmt_out.video.i_chroma,
 692                                                     VLC_CODEC_I420 );
 693     i_dst_pitch = p_dst->p[Y_PLANE].i_pitch;
 694     p_dst_y = p_dst->p[Y_PLANE].p_pixels + i_x_offset +
 695               p_filter->fmt_out.video.i_x_offset +
 696               p_dst->p[Y_PLANE].i_pitch *
 697               ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 698     const int i_u_plane = b_swap_up ? V_PLANE : U_PLANE;
 699     p_dst_u = p_dst->p[i_u_plane].p_pixels + i_x_offset/2 +
 700               p_filter->fmt_out.video.i_x_offset/2 +
 701               ( i_y_offset + p_filter->fmt_out.video.i_y_offset ) / 2 *
 702               p_dst->p[i_u_plane].i_pitch;
 703     const int i_v_plane = b_swap_up ? U_PLANE : V_PLANE;
 704     p_dst_v = p_dst->p[i_v_plane].p_pixels + i_x_offset/2 +
 705               p_filter->fmt_out.video.i_x_offset/2 +
 706               ( i_y_offset + p_filter->fmt_out.video.i_y_offset ) / 2 *
 707               p_dst->p[i_v_plane].i_pitch;
 708
 709     p_src_y = vlc_plane_start( &i_src_pitch, p_src, Y_PLANE,
 710                                0, 0, &p_filter->fmt_in.video, 1 );
 711     p_src_u = vlc_plane_start( NULL, p_src, U_PLANE,
 712                                0, 0, &p_filter->fmt_in.video, 2 );
 713     p_src_v = vlc_plane_start( NULL, p_src, V_PLANE,
 714                                0, 0, &p_filter->fmt_in.video, 2 );
 715     i_width &= ~1;
 716
 717     /* Draw until we reach the bottom of the subtitle */
 718     for( i_y = 0; i_y < i_height; i_y++,
 719          p_dst_y += i_dst_pitch,
 720          p_src_y += i_src_pitch )
 721     {
 722         if( b_even_scanline )
 723         {
 724             p_dst_u  += i_dst_pitch/2;
 725             p_dst_v  += i_dst_pitch/2;
 726         }
 727         b_even_scanline = !b_even_scanline;
 728
 729         /* Draw until we reach the end of the line */
 730         for( i_x = 0; i_x < i_width; i_x++ )
 731         {
 732             if( !i_alpha )
 733                 continue;
 734
 735             /* Blending */
 736             p_dst_y[i_x] = vlc_blend( p_src_y[i_x], p_dst_y[i_x], i_alpha );
 737             if( b_even_scanline && i_x % 2 == 0 )
 738             {
 739                 p_dst_u[i_x/2] = vlc_blend( p_src_u[i_x/2], p_dst_u[i_x/2], i_alpha );
 740                 p_dst_v[i_x/2] = vlc_blend( p_src_v[i_x/2], p_dst_v[i_x/2], i_alpha );
 741             }
 742         }
 743         if( i_y%2 == 1 )
 744         {
 745             p_src_u += i_src_pitch/2;
 746             p_src_v += i_src_pitch/2;
 747         }
 748     }
 749 }
 750 static void BlendI420I420_no_alpha( filter_t *p_filter,
 751                                     picture_t *p_dst, const picture_t *p_src,
 752                                     int i_x_offset, int i_y_offset,
 753                                     int i_width, int i_height )
 754 {
 755     int i_src_pitch, i_dst_pitch;
 756     uint8_t *p_src_y, *p_dst_y;
 757     uint8_t *p_src_u, *p_dst_u;
 758     uint8_t *p_src_v, *p_dst_v;
 759     int i_y;
 760     bool b_even_scanline = i_y_offset % 2;
 761
 762     bool b_swap_up = vlc_fourcc_AreUVPlanesSwapped( p_filter->fmt_out.video.i_chroma,
 763                                                     VLC_CODEC_I420 );
 764     i_dst_pitch = p_dst->p[Y_PLANE].i_pitch;
 765     p_dst_y = p_dst->p[Y_PLANE].p_pixels + i_x_offset +
 766               p_filter->fmt_out.video.i_x_offset +
 767               p_dst->p[Y_PLANE].i_pitch *
 768               ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 769     const int i_u_plane = b_swap_up ? V_PLANE : U_PLANE;
 770     p_dst_u = p_dst->p[i_u_plane].p_pixels + i_x_offset/2 +
 771               p_filter->fmt_out.video.i_x_offset/2 +
 772               ( i_y_offset + p_filter->fmt_out.video.i_y_offset ) / 2 *
 773               p_dst->p[i_u_plane].i_pitch;
 774     const int i_v_plane = b_swap_up ? U_PLANE : V_PLANE;
 775     p_dst_v = p_dst->p[i_v_plane].p_pixels + i_x_offset/2 +
 776               p_filter->fmt_out.video.i_x_offset/2 +
 777               ( i_y_offset + p_filter->fmt_out.video.i_y_offset ) / 2 *
 778               p_dst->p[i_v_plane].i_pitch;
 779
 780     p_src_y = vlc_plane_start( &i_src_pitch, p_src, Y_PLANE,
 781                                0, 0, &p_filter->fmt_in.video, 1 );
 782     p_src_u = vlc_plane_start( NULL, p_src, U_PLANE,
 783                                0, 0, &p_filter->fmt_in.video, 2 );
 784     p_src_v = vlc_plane_start( NULL, p_src, V_PLANE,
 785                                0, 0, &p_filter->fmt_in.video, 2 );
 786
 787     i_width &= ~1;
 788
 789     /* Draw until we reach the bottom of the subtitle */
 790     for( i_y = 0; i_y < i_height;
 791             i_y++, p_dst_y += i_dst_pitch, p_src_y += i_src_pitch )
 792     {
 793         /* Completely opaque. Completely overwrite underlying pixel */
 794         vlc_memcpy( p_dst_y, p_src_y, i_width );
 795         if( b_even_scanline )
 796         {
 797             p_dst_u  += i_dst_pitch/2;
 798             p_dst_v  += i_dst_pitch/2;
 799         }
 800         else
 801         {
 802             vlc_memcpy( p_dst_u, p_src_u, i_width/2 );
 803             vlc_memcpy( p_dst_v, p_src_v, i_width/2 );
 804         }
 805         b_even_scanline = !b_even_scanline;
 806         if( i_y%2 == 1 )
 807         {
 808             p_src_u += i_src_pitch/2;
 809             p_src_v += i_src_pitch/2;
 810         }
 811     }
 812 }
 813
 814 static void BlendI420R16( filter_t *p_filter,
 815                           picture_t *p_dst_pic, const picture_t *p_src,
 816                           int i_x_offset, int i_y_offset,
 817                           int i_width, int i_height, int i_alpha )
 818 {
 819     int i_src_pitch, i_dst_pitch;
 820     uint8_t *p_dst, *p_src_y;
 821     uint8_t *p_src_u, *p_src_v;
 822     int i_x, i_y, i_pix_pitch;
 823     int r, g, b;
 824
 825     i_pix_pitch = p_dst_pic->p->i_pixel_pitch;
 826     i_dst_pitch = p_dst_pic->p->i_pitch;
 827     p_dst = p_dst_pic->p->p_pixels + i_x_offset * i_pix_pitch +
 828             p_filter->fmt_out.video.i_x_offset * i_pix_pitch +
 829             p_dst_pic->p->i_pitch *
 830             ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 831
 832     p_src_y = vlc_plane_start( &i_src_pitch, p_src, Y_PLANE,
 833                                0, 0, &p_filter->fmt_in.video, 1 );
 834     p_src_u = vlc_plane_start( NULL, p_src, U_PLANE,
 835                                0, 0, &p_filter->fmt_in.video, 2 );
 836     p_src_v = vlc_plane_start( NULL, p_src, V_PLANE,
 837                                 0, 0, &p_filter->fmt_in.video, 2 );
 838
 839     /* Draw until we reach the bottom of the subtitle */
 840     for( i_y = 0; i_y < i_height; i_y++,
 841          p_dst += i_dst_pitch,
 842          p_src_y += i_src_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             /* Blending */
 848             yuv_to_rgb( &r, &g, &b,
 849                         p_src_y[i_x], p_src_u[i_x/2], p_src_v[i_x/2] );
 850
 851             vlc_blend_rgb16( (uint16_t*)&p_dst[i_x * i_pix_pitch],
 852                              r, g, b, i_alpha, &p_filter->fmt_out.video );
 853         }
 854         if( i_y%2 == 1 )
 855         {
 856             p_src_u += i_src_pitch/2;
 857             p_src_v += i_src_pitch/2;
 858         }
 859     }
 860 }
 861
 862 static void BlendI420R24( filter_t *p_filter,
 863                           picture_t *p_dst_pic, const picture_t *p_src,
 864                           int i_x_offset, int i_y_offset,
 865                           int i_width, int i_height, int i_alpha )
 866 {
 867     int i_src_pitch, i_dst_pitch;
 868     uint8_t *p_dst, *p_src_y;
 869     uint8_t *p_src_u, *p_src_v;
 870     int i_x, i_y, i_pix_pitch;
 871     int i_rindex, i_gindex, i_bindex;
 872     int r, g, b;
 873
 874     i_pix_pitch = p_dst_pic->p->i_pixel_pitch;
 875     i_dst_pitch = p_dst_pic->p->i_pitch;
 876     p_dst = p_dst_pic->p->p_pixels + i_x_offset * i_pix_pitch +
 877             p_filter->fmt_out.video.i_x_offset * i_pix_pitch +
 878             p_dst_pic->p->i_pitch *
 879             ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 880
 881     p_src_y = vlc_plane_start( &i_src_pitch, p_src, Y_PLANE,
 882                                0, 0, &p_filter->fmt_in.video, 1 );
 883     p_src_u = vlc_plane_start( NULL, p_src, U_PLANE,
 884                                0, 0, &p_filter->fmt_in.video, 2 );
 885     p_src_v = vlc_plane_start( NULL, p_src, V_PLANE,
 886                                0, 0, &p_filter->fmt_in.video, 2 );
 887
 888     vlc_rgb_index( &i_rindex, &i_gindex, &i_bindex, &p_filter->fmt_out.video );
 889
 890     /* Draw until we reach the bottom of the subtitle */
 891     for( i_y = 0; i_y < i_height; i_y++,
 892          p_dst += i_dst_pitch,
 893          p_src_y += i_src_pitch, p_src_u += i_src_pitch,
 894          p_src_v += i_src_pitch )
 895     {
 896         /* Draw until we reach the end of the line */
 897         for( i_x = 0; i_x < i_width; i_x++ )
 898         {
 899             if( !i_alpha )
 900                 continue;
 901
 902             /* Blending */
 903             yuv_to_rgb( &r, &g, &b,
 904                         p_src_y[i_x], p_src_u[i_x/2], p_src_v[i_x/2] );
 905
 906             vlc_blend_packed( &p_dst[i_x * i_pix_pitch],
 907                               i_rindex, i_gindex, i_bindex, r, g, b, i_alpha, true );
 908         }
 909         if( i_y%2 == 1 )
 910         {
 911             p_src_u += i_src_pitch/2;
 912             p_src_v += i_src_pitch/2;
 913         }
 914     }
 915 }
 916
 917 static void BlendI420YUVPacked( filter_t *p_filter,
 918                                 picture_t *p_dst_pic, const picture_t *p_src,
 919                                 int i_x_offset, int i_y_offset,
 920                                 int i_width, int i_height, int i_alpha )
 921 {
 922     int i_src_pitch, i_dst_pitch;
 923     uint8_t *p_dst, *p_src_y;
 924     uint8_t *p_src_u, *p_src_v;
 925     int i_x, i_y, i_pix_pitch;
 926     bool b_even = !((i_x_offset + p_filter->fmt_out.video.i_x_offset)%2);
 927     int i_l_offset, i_u_offset, i_v_offset;
 928
 929     vlc_yuv_packed_index( &i_l_offset, &i_u_offset, &i_v_offset,
 930                           p_filter->fmt_out.video.i_chroma );
 931
 932     i_pix_pitch = 2;
 933     i_dst_pitch = p_dst_pic->p->i_pitch;
 934     p_dst = p_dst_pic->p->p_pixels + i_x_offset * i_pix_pitch +
 935             p_filter->fmt_out.video.i_x_offset * i_pix_pitch +
 936             p_dst_pic->p->i_pitch *
 937             ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 938
 939     p_src_y = vlc_plane_start( &i_src_pitch, p_src, Y_PLANE,
 940                                0, 0, &p_filter->fmt_in.video, 1 );
 941     p_src_u = vlc_plane_start( NULL, p_src, U_PLANE,
 942                                0, 0, &p_filter->fmt_in.video, 2 );
 943     p_src_v = vlc_plane_start( NULL, p_src, V_PLANE,
 944                                0, 0, &p_filter->fmt_in.video, 2 );
 945
 946     i_width &= ~1; /* Needs to be a multiple of 2 */
 947
 948     /* Draw until we reach the bottom of the subtitle */
 949     for( i_y = 0; i_y < i_height; i_y++,
 950          p_dst += i_dst_pitch,
 951          p_src_y += i_src_pitch, p_src_u += i_src_pitch,
 952          p_src_v += i_src_pitch )
 953     {
 954         /* Draw until we reach the end of the line */
 955         for( i_x = 0; i_x < i_width; i_x++, b_even = !b_even )
 956         {
 957             if( !i_alpha )
 958                 continue;
 959
 960             /* Blending */
 961             vlc_blend_packed( &p_dst[i_x * 2],
 962                               i_l_offset, i_u_offset, i_v_offset,
 963                               p_src_y[i_x], p_src_u[i_x/2], p_src_v[i_x/2], i_alpha, b_even );
 964         }
 965         if( i_y%2 == 1 )
 966         {
 967             p_src_u += i_src_pitch/2;
 968             p_src_v += i_src_pitch/2;
 969         }
 970     }
 971 }
 972
 973 /***********************************************************************
 974  * YUVP
 975  ***********************************************************************/
 976 static void BlendPalI420( filter_t *p_filter,
 977                           picture_t *p_dst, const picture_t *p_src_pic,
 978                           int i_x_offset, int i_y_offset,
 979                           int i_width, int i_height, int i_alpha )
 980 {
 981     int i_src_pitch, i_dst_pitch;
 982     uint8_t *p_src, *p_dst_y;
 983     uint8_t *p_dst_u;
 984     uint8_t *p_dst_v;
 985     int i_x, i_y, i_trans;
 986     bool b_even_scanline = i_y_offset % 2;
 987
 988     bool b_swap_up = vlc_fourcc_AreUVPlanesSwapped( p_filter->fmt_out.video.i_chroma,
 989                                                     VLC_CODEC_I420 );
 990     i_dst_pitch = p_dst->p[Y_PLANE].i_pitch;
 991     p_dst_y = p_dst->p[Y_PLANE].p_pixels + i_x_offset +
 992               p_filter->fmt_out.video.i_x_offset +
 993               p_dst->p[Y_PLANE].i_pitch *
 994               ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
 995     const int i_u_plane = b_swap_up ? V_PLANE : U_PLANE;
 996     p_dst_u = p_dst->p[i_u_plane].p_pixels + i_x_offset/2 +
 997               p_filter->fmt_out.video.i_x_offset/2 +
 998               ( i_y_offset + p_filter->fmt_out.video.i_y_offset ) / 2 *
 999               p_dst->p[i_u_plane].i_pitch;
1000     const int i_v_plane = b_swap_up ? U_PLANE : V_PLANE;
1001     p_dst_v = p_dst->p[i_v_plane].p_pixels + i_x_offset/2 +
1002               p_filter->fmt_out.video.i_x_offset/2 +
1003               ( i_y_offset + p_filter->fmt_out.video.i_y_offset ) / 2 *
1004               p_dst->p[i_v_plane].i_pitch;
1005
1006     i_src_pitch = p_src_pic->p->i_pitch;
1007     p_src = p_src_pic->p->p_pixels + p_filter->fmt_in.video.i_x_offset +
1008             i_src_pitch * p_filter->fmt_in.video.i_y_offset;
1009
1010 #define p_pal p_filter->fmt_in.video.p_palette->palette
1011
1012     /* Draw until we reach the bottom of the subtitle */
1013     for( i_y = 0; i_y < i_height; i_y++,
1014          p_dst_y += i_dst_pitch,
1015          p_src += i_src_pitch,
1016          p_dst_u += b_even_scanline ? i_dst_pitch/2 : 0,
1017          p_dst_v += b_even_scanline ? i_dst_pitch/2 : 0 )
1018     {
1019         const uint8_t *p_trans = p_src;
1020         b_even_scanline = !b_even_scanline;
1021
1022         /* Draw until we reach the end of the line */
1023         for( i_x = 0; i_x < i_width; i_x++ )
1024         {
1025             i_trans = vlc_alpha( p_pal[p_trans[i_x]][3], i_alpha );
1026             if( !i_trans )
1027                 continue;
1028
1029             /* Blending */
1030             p_dst_y[i_x] = vlc_blend( p_pal[p_src[i_x]][0], p_dst_y[i_x], i_trans );
1031             if( b_even_scanline && ((i_x % 2) == 0) )
1032             {
1033                 p_dst_u[i_x/2] = vlc_blend( p_pal[p_src[i_x]][1], p_dst_u[i_x/2], i_trans );
1034                 p_dst_v[i_x/2] = vlc_blend( p_pal[p_src[i_x]][2], p_dst_v[i_x/2], i_trans );
1035             }
1036         }
1037     }
1038 #undef p_pal
1039 }
1040
1041 static void BlendPalYUVPacked( filter_t *p_filter,
1042                                picture_t *p_dst_pic, const picture_t *p_src_pic,
1043                                int i_x_offset, int i_y_offset,
1044                                int i_width, int i_height, int i_alpha )
1045 {
1046     int i_src_pitch, i_dst_pitch;
1047     uint8_t *p_src, *p_dst;
1048     int i_x, i_y, i_pix_pitch, i_trans;
1049     bool b_even = !((i_x_offset + p_filter->fmt_out.video.i_x_offset)%2);
1050     int i_l_offset, i_u_offset, i_v_offset;
1051
1052     vlc_yuv_packed_index( &i_l_offset, &i_u_offset, &i_v_offset,
1053                           p_filter->fmt_out.video.i_chroma );
1054
1055     i_pix_pitch = 2;
1056     i_dst_pitch = p_dst_pic->p->i_pitch;
1057     p_dst = p_dst_pic->p->p_pixels + i_pix_pitch * (i_x_offset +
1058             p_filter->fmt_out.video.i_x_offset) + p_dst_pic->p->i_pitch *
1059             ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
1060
1061     i_src_pitch = p_src_pic->p->i_pitch;
1062     p_src = p_src_pic->p->p_pixels + p_filter->fmt_in.video.i_x_offset +
1063             i_src_pitch * p_filter->fmt_in.video.i_y_offset;
1064
1065     i_width &= ~1; /* Needs to be a multiple of 2 */
1066
1067 #define p_pal p_filter->fmt_in.video.p_palette->palette
1068
1069     /* Draw until we reach the bottom of the subtitle */
1070     for( i_y = 0; i_y < i_height; i_y++,
1071          p_dst += i_dst_pitch, p_src += i_src_pitch )
1072     {
1073         const uint8_t *p_trans = p_src;
1074         /* Draw until we reach the end of the line */
1075         for( i_x = 0; i_x < i_width; i_x++, b_even = !b_even )
1076         {
1077             i_trans = vlc_alpha( p_pal[p_trans[i_x]][3], i_alpha );
1078             if( !i_trans )
1079                 continue;
1080
1081             /* Blending */
1082             if( b_even )
1083             {
1084                 uint16_t i_u;
1085                 uint16_t i_v;
1086                 if( p_trans[i_x+1] > 0xaa )
1087                 {
1088                     i_u = (p_pal[p_src[i_x]][1] + p_pal[p_src[i_x+1]][1]) >> 1;
1089                     i_v = (p_pal[p_src[i_x]][2] + p_pal[p_src[i_x+1]][2]) >> 1;
1090                 }
1091                 else
1092                 {
1093                     i_u = p_pal[p_src[i_x]][1];
1094                     i_v = p_pal[p_src[i_x]][2];
1095                 }
1096
1097                 vlc_blend_packed( &p_dst[i_x * 2],
1098                                   i_l_offset, i_u_offset, i_v_offset,
1099                                   p_pal[p_src[i_x]][0], i_u, i_v, i_trans, true );
1100             }
1101             else
1102             {
1103                 p_dst[i_x * 2 + i_l_offset] = vlc_blend( p_pal[p_src[i_x]][0], p_dst[i_x * 2 + i_l_offset], i_trans );
1104             }
1105         }
1106     }
1107 #undef p_pal
1108 }
1109
1110 static void BlendPalRV( filter_t *p_filter,
1111                         picture_t *p_dst_pic, const picture_t *p_src_pic,
1112                         int i_x_offset, int i_y_offset,
1113                         int i_width, int i_height, int i_alpha )
1114 {
1115     int i_src_pitch, i_dst_pitch;
1116     uint8_t *p_src, *p_dst;
1117     int i_x, i_y, i_pix_pitch, i_trans;
1118     video_palette_t rgbpalette;
1119     int i_rindex, i_gindex, i_bindex;
1120
1121     i_pix_pitch = p_dst_pic->p->i_pixel_pitch;
1122     i_dst_pitch = p_dst_pic->p->i_pitch;
1123     p_dst = p_dst_pic->p->p_pixels + i_pix_pitch * (i_x_offset +
1124             p_filter->fmt_out.video.i_x_offset) + p_dst_pic->p->i_pitch *
1125             ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
1126
1127     i_src_pitch = p_src_pic->p->i_pitch;
1128     p_src = p_src_pic->p->p_pixels + p_filter->fmt_in.video.i_x_offset +
1129             i_src_pitch * p_filter->fmt_in.video.i_y_offset;
1130
1131 #define p_pal p_filter->fmt_in.video.p_palette->palette
1132 #define rgbpal rgbpalette.palette
1133
1134     /* Convert palette first */
1135     for( i_y = 0; i_y < p_filter->fmt_in.video.p_palette->i_entries && i_y < 256; i_y++ )
1136     {
1137         int r, g, b;
1138
1139         yuv_to_rgb( &r, &g, &b, p_pal[i_y][0], p_pal[i_y][1], p_pal[i_y][2] );
1140         rgbpal[i_y][0] = r;
1141         rgbpal[i_y][1] = g;
1142         rgbpal[i_y][2] = b;
1143     }
1144
1145     /* */
1146     vlc_rgb_index( &i_rindex, &i_gindex, &i_bindex, &p_filter->fmt_out.video );
1147
1148     /* Draw until we reach the bottom of the subtitle */
1149     for( i_y = 0; i_y < i_height; i_y++,
1150          p_dst += i_dst_pitch, p_src += i_src_pitch )
1151     {
1152         const uint8_t *p_trans = p_src;
1153         /* Draw until we reach the end of the line */
1154         for( i_x = 0; i_x < i_width; i_x++ )
1155         {
1156             i_trans = vlc_alpha( p_pal[p_trans[i_x]][3], i_alpha );
1157             if( !i_trans )
1158                 continue;
1159
1160             /* Blending */
1161             if( p_filter->fmt_out.video.i_chroma == VLC_CODEC_RGB15 || p_filter->fmt_out.video.i_chroma == VLC_CODEC_RGB16 )
1162                 vlc_blend_rgb16( (uint16_t*)&p_dst[i_x * i_pix_pitch],
1163                                   rgbpal[p_src[i_x]][0], rgbpal[p_src[i_x]][1], rgbpal[p_src[i_x]][2],
1164                                   i_trans,
1165                                   &p_filter->fmt_out.video );
1166             else
1167                 vlc_blend_packed( &p_dst[i_x * i_pix_pitch],
1168                                   i_rindex, i_gindex, i_bindex,
1169                                   rgbpal[p_src[i_x]][0], rgbpal[p_src[i_x]][1], rgbpal[p_src[i_x]][2],
1170                                   i_trans, true );
1171         }
1172     }
1173
1174 #undef p_pal
1175 #undef rgbpal
1176 }
1177
1178 /***********************************************************************
1179  * RGBA
1180  ***********************************************************************/
1181 static void BlendRGBAI420( filter_t *p_filter,
1182                            picture_t *p_dst, const picture_t *p_src_pic,
1183                            int i_x_offset, int i_y_offset,
1184                            int i_width, int i_height, int i_alpha )
1185 {
1186     int i_src_pitch, i_dst_pitch, i_src_pix_pitch;
1187     uint8_t *p_dst_y;
1188     uint8_t *p_dst_u;
1189     uint8_t *p_dst_v;
1190     uint8_t *p_src;
1191     int i_x, i_y, i_trans;
1192     uint8_t y, u, v;
1193
1194     bool b_even_scanline = i_y_offset % 2;
1195     bool b_swap_up = vlc_fourcc_AreUVPlanesSwapped( p_filter->fmt_out.video.i_chroma,
1196                                                     VLC_CODEC_I420 );
1197     i_dst_pitch = p_dst->p[Y_PLANE].i_pitch;
1198     p_dst_y = p_dst->p[Y_PLANE].p_pixels + i_x_offset +
1199               p_filter->fmt_out.video.i_x_offset +
1200               p_dst->p[Y_PLANE].i_pitch *
1201               ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
1202     const int i_u_plane = b_swap_up ? V_PLANE : U_PLANE;
1203     p_dst_u = p_dst->p[i_u_plane].p_pixels + i_x_offset/2 +
1204               p_filter->fmt_out.video.i_x_offset/2 +
1205               ( i_y_offset + p_filter->fmt_out.video.i_y_offset ) / 2 *
1206               p_dst->p[i_u_plane].i_pitch;
1207     const int i_v_plane = b_swap_up ? U_PLANE : V_PLANE;
1208     p_dst_v = p_dst->p[i_v_plane].p_pixels + i_x_offset/2 +
1209               p_filter->fmt_out.video.i_x_offset/2 +
1210               ( i_y_offset + p_filter->fmt_out.video.i_y_offset ) / 2 *
1211               p_dst->p[i_v_plane].i_pitch;
1212
1213     i_src_pix_pitch = p_src_pic->p->i_pixel_pitch;
1214     i_src_pitch = p_src_pic->p->i_pitch;
1215     p_src = p_src_pic->p->p_pixels +
1216             p_filter->fmt_in.video.i_x_offset * i_src_pix_pitch +
1217             p_src_pic->p->i_pitch * p_filter->fmt_in.video.i_y_offset;
1218
1219
1220     /* Draw until we reach the bottom of the subtitle */
1221     for( i_y = 0; i_y < i_height; i_y++,
1222          p_dst_y += i_dst_pitch,
1223          p_dst_u += b_even_scanline ? i_dst_pitch/2 : 0,
1224          p_dst_v += b_even_scanline ? i_dst_pitch/2 : 0,
1225          p_src += i_src_pitch )
1226     {
1227         b_even_scanline = !b_even_scanline;
1228
1229         /* Draw until we reach the end of the line */
1230         for( i_x = 0; i_x < i_width; i_x++ )
1231         {
1232             const int R = p_src[i_x * i_src_pix_pitch + 0];
1233             const int G = p_src[i_x * i_src_pix_pitch + 1];
1234             const int B = p_src[i_x * i_src_pix_pitch + 2];
1235
1236             i_trans = vlc_alpha( p_src[i_x * i_src_pix_pitch + 3], i_alpha );
1237             if( !i_trans )
1238                 continue;
1239
1240             /* Blending */
1241             rgb_to_yuv( &y, &u, &v, R, G, B );
1242
1243             p_dst_y[i_x] = vlc_blend( y, p_dst_y[i_x], i_trans );
1244             if( b_even_scanline && i_x % 2 == 0 )
1245             {
1246                 p_dst_u[i_x/2] = vlc_blend( u, p_dst_u[i_x/2], i_trans );
1247                 p_dst_v[i_x/2] = vlc_blend( v, p_dst_v[i_x/2], i_trans );
1248             }
1249         }
1250     }
1251 }
1252
1253 static void BlendRGBAR24( filter_t *p_filter,
1254                           picture_t *p_dst_pic, const picture_t *p_src_pic,
1255                           int i_x_offset, int i_y_offset,
1256                           int i_width, int i_height, int i_alpha )
1257 {
1258     int i_src_pitch, i_dst_pitch;
1259     uint8_t *p_dst, *p_src;
1260     int i_x, i_y, i_pix_pitch, i_trans, i_src_pix_pitch;
1261     int i_rindex, i_gindex, i_bindex;
1262
1263     i_pix_pitch = p_dst_pic->p->i_pixel_pitch;
1264     i_dst_pitch = p_dst_pic->p->i_pitch;
1265     p_dst = p_dst_pic->p->p_pixels + i_x_offset * i_pix_pitch +
1266             p_filter->fmt_out.video.i_x_offset * i_pix_pitch +
1267             p_dst_pic->p->i_pitch *
1268             ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
1269
1270     i_src_pix_pitch = p_src_pic->p->i_pixel_pitch;
1271     i_src_pitch = p_src_pic->p->i_pitch;
1272     p_src = p_src_pic->p->p_pixels +
1273             p_filter->fmt_in.video.i_x_offset * i_src_pix_pitch +
1274             p_src_pic->p->i_pitch * p_filter->fmt_in.video.i_y_offset;
1275
1276     vlc_rgb_index( &i_rindex, &i_gindex, &i_bindex, &p_filter->fmt_out.video );
1277
1278     /* Draw until we reach the bottom of the subtitle */
1279     for( i_y = 0; i_y < i_height; i_y++,
1280          p_dst += i_dst_pitch, p_src += i_src_pitch )
1281     {
1282         /* Draw until we reach the end of the line */
1283         for( i_x = 0; i_x < i_width; i_x++ )
1284         {
1285             const int R = p_src[i_x * i_src_pix_pitch + 0];
1286             const int G = p_src[i_x * i_src_pix_pitch + 1];
1287             const int B = p_src[i_x * i_src_pix_pitch + 2];
1288
1289             i_trans = vlc_alpha( p_src[i_x * i_src_pix_pitch + 3], i_alpha );
1290             if( !i_trans )
1291                 continue;
1292
1293             /* Blending */
1294             vlc_blend_packed( &p_dst[i_x * i_pix_pitch],
1295                               i_rindex, i_gindex, i_bindex,
1296                               R, G, B, i_trans, true );
1297         }
1298     }
1299 }
1300
1301 static void BlendRGBAR16( filter_t *p_filter,
1302                           picture_t *p_dst_pic, const picture_t *p_src_pic,
1303                           int i_x_offset, int i_y_offset,
1304                           int i_width, int i_height, int i_alpha )
1305 {
1306     int i_src_pitch, i_dst_pitch;
1307     uint8_t *p_dst, *p_src;
1308     int i_x, i_y, i_pix_pitch, i_trans, i_src_pix_pitch;
1309
1310     i_pix_pitch = p_dst_pic->p->i_pixel_pitch;
1311     i_dst_pitch = p_dst_pic->p->i_pitch;
1312     p_dst = p_dst_pic->p->p_pixels + i_x_offset * i_pix_pitch +
1313             p_filter->fmt_out.video.i_x_offset * i_pix_pitch +
1314             p_dst_pic->p->i_pitch *
1315             ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
1316
1317     i_src_pix_pitch = p_src_pic->p->i_pixel_pitch;
1318     i_src_pitch = p_src_pic->p->i_pitch;
1319     p_src = p_src_pic->p->p_pixels +
1320             p_filter->fmt_in.video.i_x_offset * i_src_pix_pitch +
1321             p_src_pic->p->i_pitch * p_filter->fmt_in.video.i_y_offset;
1322
1323     /* Draw until we reach the bottom of the subtitle */
1324     for( i_y = 0; i_y < i_height; i_y++,
1325          p_dst += i_dst_pitch, p_src += i_src_pitch )
1326     {
1327         /* Draw until we reach the end of the line */
1328         for( i_x = 0; i_x < i_width; i_x++ )
1329         {
1330             const int R = p_src[i_x * i_src_pix_pitch + 0];
1331             const int G = p_src[i_x * i_src_pix_pitch + 1];
1332             const int B = p_src[i_x * i_src_pix_pitch + 2];
1333
1334             i_trans = vlc_alpha( p_src[i_x * i_src_pix_pitch + 3], i_alpha );
1335             if( !i_trans )
1336                 continue;
1337
1338             /* Blending */
1339             vlc_blend_rgb16( (uint16_t*)&p_dst[i_x * i_pix_pitch],
1340                              R, G, B, i_trans, &p_filter->fmt_out.video );
1341         }
1342     }
1343 }
1344
1345 static void BlendRGBAYUVPacked( filter_t *p_filter,
1346                                 picture_t *p_dst_pic, const picture_t *p_src_pic,
1347                                 int i_x_offset, int i_y_offset,
1348                                 int i_width, int i_height, int i_alpha )
1349 {
1350     int i_src_pitch, i_dst_pitch, i_src_pix_pitch;
1351     uint8_t *p_dst, *p_src;
1352     int i_x, i_y, i_pix_pitch, i_trans;
1353     bool b_even = !((i_x_offset + p_filter->fmt_out.video.i_x_offset)%2);
1354     int i_l_offset, i_u_offset, i_v_offset;
1355     uint8_t y, u, v;
1356
1357     vlc_yuv_packed_index( &i_l_offset, &i_u_offset, &i_v_offset,
1358                           p_filter->fmt_out.video.i_chroma );
1359
1360     i_pix_pitch = 2;
1361     i_dst_pitch = p_dst_pic->p->i_pitch;
1362     p_dst = p_dst_pic->p->p_pixels + i_x_offset * i_pix_pitch +
1363             p_filter->fmt_out.video.i_x_offset * i_pix_pitch +
1364             p_dst_pic->p->i_pitch *
1365             ( i_y_offset + p_filter->fmt_out.video.i_y_offset );
1366
1367     i_src_pix_pitch = p_src_pic->p->i_pixel_pitch;
1368     i_src_pitch = p_src_pic->p->i_pitch;
1369     p_src = p_src_pic->p->p_pixels +
1370             p_filter->fmt_in.video.i_x_offset * i_src_pitch +
1371             p_src_pic->p->i_pitch * p_filter->fmt_in.video.i_y_offset;
1372
1373     i_width &= ~1; /* Needs to be a multiple of 2 */
1374
1375     /* Draw until we reach the bottom of the subtitle */
1376     for( i_y = 0; i_y < i_height; i_y++,
1377          p_dst += i_dst_pitch,
1378          p_src += i_src_pitch )
1379     {
1380         /* Draw until we reach the end of the line */
1381         for( i_x = 0; i_x < i_width; i_x++, b_even = !b_even )
1382         {
1383             const int R = p_src[i_x * i_src_pix_pitch + 0];
1384             const int G = p_src[i_x * i_src_pix_pitch + 1];
1385             const int B = p_src[i_x * i_src_pix_pitch + 2];
1386
1387             i_trans = vlc_alpha( p_src[i_x * i_src_pix_pitch + 3], i_alpha );
1388             if( !i_trans )
1389                 continue;
1390
1391             /* Blending */
1392             rgb_to_yuv( &y, &u, &v, R, G, B );
1393
1394             vlc_blend_packed( &p_dst[i_x * 2],
1395                               i_l_offset, i_u_offset, i_v_offset,
1396                               y, u, v, i_trans, b_even );
1397         }
1398     }
1399 }