1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
|
/*
* This file is part of the XForms library package.
*
* XForms is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1, or
* (at your option) any later version.
*
* XForms is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with XForms. If not, see <http://www.gnu.org/licenses/>.
*/
/*
* This file is part of the XForms library package.
* Copyright (c) 1996-2002 T.C. Zhao and Mark Overmars
* All rights reserved.
*
* combine two images in the following way
* IM = IM1 * alpha + IM2 * (1-alpha)
*/
/*** UNFINISHED and UNTESTED */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "include/forms.h"
#include "flimage.h"
#include "flimage_int.h"
FL_IMAGE *
flimage_combine( FL_IMAGE * im1,
FL_IMAGE * im2,
double alpha )
{
FL_IMAGE *ret;
int i,
w,
h,
x,
y;
if ( ! im1 || im1->w <= 0 || ! im2 || im2->w <= 0 )
return 0;
if ( ! ( ret = flimage_alloc( ) ) )
{
flimage_error( im1, "can't allocate resulting image" );
return 0;
}
ret->w = im1->w;
ret->h = im1->h;
ret->type = FLIMAGE_RGB;
flimage_get_linearlut( ret );
/* Convert to RGB */
flimage_convert( im1, FLIMAGE_RGB, 0 );
flimage_convert( im2, FLIMAGE_RGB, 0 );
/* Populate the lut */
for ( i = 0; i <= FL_PCMAX; i++ )
{
ret->llut[ 0 ][ i ] = i * alpha + 0.5;
ret->llut[ 1 ][ i ] = i - ret->llut[ 0 ][ i ];
}
w = FL_min( im1->w, im2->w );
h = FL_min( im1->h, im2->h );
for ( y = 0; y < h; y++)
{
for ( x = 0; x < w; x++)
{
ret->red[ y ][ x ] = ret->llut[ 0 ][ im1->red[ y ][ x ] ]
+ ret->llut[ 1 ][ im2->red[ y ][ x ] ];
ret->green[ y ][ x ] = ret->llut[ 0 ][ im1->green[ y ][ x ] ]
+ ret->llut[ 1 ][ im2->green[ y ][ x ] ];
ret->blue[ y ][ x ] = ret->llut[ 0 ][ im1->blue[ y ][ x ] ]
+ ret->llut[ 1 ][ im2->blue[ y ][ x ] ];
}
for ( ; x < im1->w; x++ )
{
ret->red[ y ][ x ] = im1->red[ y ][ x ];
ret->green[ y ][ x ] = im1->green[ y ][ x ];
ret->blue[ y ][ x ] = im1->blue[ y ][ x ];
}
}
for ( ; y < im1->h; y++ )
for ( x = 0; x < im1->w; x++ )
{
ret->red[ y ][ x ] = im1->red[ y ][ x ];
ret->green[ y ][ x ] = im1->green[ y ][ x ];
ret->blue[ y ][ x ] = im1->blue[ y ][ x ];
}
return ret;
}
/*
* Local variables:
* tab-width: 4
* indent-tabs-mode: nil
* End:
*/
|
