1 /*****************************************************************************
2 * i420_rgb8.c : YUV to bitmap RGB conversion module for vlc
3 *****************************************************************************
4 * Copyright (C) 2000 VideoLAN
5 * $Id: i420_rgb8.c,v 1.1 2002/01/04 14:01:34 sam Exp $
7 * Authors: Samuel Hocevar <sam@zoy.org>
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 *****************************************************************************/
27 #include <math.h> /* exp(), pow() */
28 #include <errno.h> /* ENOMEM */
29 #include <string.h> /* strerror() */
30 #include <stdlib.h> /* malloc(), free() */
32 #include <videolan/vlc.h>
35 #include "video_output.h"
38 #include "i420_rgb_c.h"
40 static void SetOffset( int, int, int, int, boolean_t *, int *, int * );
42 /*****************************************************************************
43 * I420_RGB8: color YUV 4:2:0 to RGB 8 bpp
44 *****************************************************************************/
45 void _M( I420_RGB8 )( vout_thread_t *p_vout, picture_t *p_source,
48 /* We got this one from the old arguments */
49 u16 *p_pic = (u16*)p_dest->p->p_pixels;
50 u8 *p_y = p_source->Y_PIXELS;
51 u8 *p_u = p_source->U_PIXELS, *p_v = p_source->V_PIXELS;
53 /* FIXME: add margins here */
54 int i_pic_line_width = p_dest->p->i_pitch / 2;
56 boolean_t b_hscale; /* horizontal scaling type */
57 int i_vscale; /* vertical scaling type */
58 int i_x, i_y; /* horizontal and vertical indexes */
59 int i_scale_count; /* scale modulo counter */
60 int i_chroma_width; /* chroma width */
61 u16 * p_pic_start; /* beginning of the current line for copy */
62 u16 * p_buffer_start; /* conversion buffer start */
63 u16 * p_buffer; /* conversion buffer pointer */
64 int * p_offset_start; /* offset array start */
65 int * p_offset; /* offset array pointer */
68 * Initialize some values - i_pic_line_width will store the line skip
70 i_pic_line_width -= p_vout->output.i_width;
71 i_chroma_width = p_vout->render.i_width / 2;
72 p_buffer_start = (u16*)p_vout->chroma.p_sys->p_buffer;
73 p_offset_start = p_vout->chroma.p_sys->p_offset;
74 SetOffset( p_vout->render.i_width, p_vout->render.i_height,
75 p_vout->output.i_width, p_vout->output.i_height,
76 &b_hscale, &i_vscale, p_offset_start );
79 intf_ErrMsg( "vout error: I420_RGB8 unimplemented, "
80 "please harass sam@zoy.org" );
83 /* Following functions are local */
85 /*****************************************************************************
86 * SetOffset: build offset array for conversion functions
87 *****************************************************************************
88 * This function will build an offset array used in later conversion functions.
89 * It will also set horizontal and vertical scaling indicators. If b_double
90 * is set, the p_offset structure has interleaved Y and U/V offsets.
91 *****************************************************************************/
92 static void SetOffset( int i_width, int i_height, int i_pic_width,
93 int i_pic_height, boolean_t *pb_hscale,
94 int *pi_vscale, int *p_offset )
96 int i_x; /* x position in destination */
97 int i_scale_count; /* modulo counter */
100 * Prepare horizontal offset array
102 if( i_pic_width - i_width == 0 )
104 /* No horizontal scaling: YUV conversion is done directly to picture */
107 else if( i_pic_width - i_width > 0 )
111 /* Prepare scaling array for horizontal extension */
113 i_scale_count = i_pic_width;
114 for( i_x = i_width; i_x--; )
116 while( (i_scale_count -= i_width) > 0 )
122 *p_offset++ = i_dummy;
123 i_dummy = 1 - i_dummy;
124 i_scale_count += i_pic_width;
127 else /* if( i_pic_width - i_width < 0 ) */
132 /* Prepare scaling array for horizontal reduction */
134 i_scale_count = i_width;
135 for( i_x = i_pic_width; i_x--; )
138 while( (i_scale_count -= i_pic_width) > 0 )
142 *p_offset++ = i_jump;
143 *p_offset++ = ( i_jump += i_remainder ) >> 1;
144 i_remainder = i_jump & 1;
145 i_scale_count += i_width;
150 * Set vertical scaling indicator
152 if( i_pic_height - i_height == 0 )
156 else if( i_pic_height - i_height > 0 )
160 else /* if( i_pic_height - i_height < 0 ) */