1 /*****************************************************************************
2 * video_spu.c : DVD subpicture units functions
3 *****************************************************************************
4 * Copyright (C) 1999, 2000 VideoLAN
6 * Authors: Samuel Hocevar <sam@zoy.org>
7 * Henri Fallon <henri@via.ecp.fr>
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.
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.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
22 *****************************************************************************/
24 /*****************************************************************************
26 *****************************************************************************/
37 #include "video_output.h"
38 #include "video_spu.h"
40 /* FIXME: fake palette - the real one has to be sought in the .IFO */
41 static int p_palette[4] = { 0x0000, 0xffff, 0x5555, 0x8888 };
43 /*****************************************************************************
44 * vout_RenderSPU: draw an SPU on a picture
45 *****************************************************************************
46 * This is a fast implementation of the subpicture drawing code. The data
47 * has been preprocessed once in spu_decoder.c, so we don't need to parse the
48 * RLE buffer again and again. Most sanity checks are done in spu_decoder.c
49 * so that this routine can be as fast as possible.
50 *****************************************************************************/
51 void vout_RenderSPU( vout_buffer_t *p_buffer, subpicture_t *p_spu,
52 int i_bytes_per_pixel, int i_bytes_per_line )
55 u16 *p_source = (u16 *)p_spu->p_data;
57 /* FIXME: we need a way to get 720 and 576 from the stream */
58 int i_xscale = ( p_buffer->i_pic_width << 6 ) / 720;
59 int i_yscale = ( p_buffer->i_pic_height << 6 ) / 576;
61 int i_width = p_spu->i_width * i_xscale;
62 int i_height = p_spu->i_height * i_yscale;
66 u8 *p_dest = p_buffer->p_data
67 /* Add the picture coordinates and the SPU coordinates */
68 + ( p_buffer->i_pic_x + ((p_spu->i_x * i_xscale) >> 6))
70 + ( p_buffer->i_pic_y + ((p_spu->i_y * i_yscale) >> 6))
73 /* Draw until we reach the bottom of the subtitle */
74 while( i_y < i_height )
76 /* Get RLE information */
77 i_len = i_xscale * ( *p_source >> 2 );
78 i_color = *p_source++ & 0x3;
83 memset( p_dest + i_bytes_per_pixel * ( i_x >> 6 )
84 + i_bytes_per_line * ( i_y >> 6 ),
86 i_bytes_per_pixel * ( ( i_len >> 6 ) + 1 ) );
88 /* Duplicate line if needed */
89 if( i_yscale > 1 << 6 )
91 memset( p_dest + i_bytes_per_pixel * ( i_x >> 6 )
92 + i_bytes_per_line * ( ( i_y >> 6 ) + 1 ),
94 i_bytes_per_pixel * ( ( i_len >> 6 ) + 1 ) );
98 /* Check for end of line */