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
119
120
121
122
123
124
125
126
127
128
129
|
/*
* The Python Imaging Library
* $Id$
*
* stuff to extract and paste back individual bands
*
* history:
* 1996-03-20 fl Created
* 1997-08-27 fl Fixed putband for single band targets.
* 2003-09-26 fl Fixed getband/putband for 2-band images (LA, PA).
*
* Copyright (c) 1997-2003 by Secret Labs AB.
* Copyright (c) 1996-1997 by Fredrik Lundh.
*
* See the README file for details on usage and redistribution.
*/
#include "Imaging.h"
#define CLIP(x) ((x) <= 0 ? 0 : (x) < 256 ? (x) : 255)
Imaging
ImagingGetBand(Imaging imIn, int band)
{
Imaging imOut;
int x, y;
/* Check arguments */
if (!imIn || imIn->type != IMAGING_TYPE_UINT8)
return (Imaging) ImagingError_ModeError();
if (band < 0 || band >= imIn->bands)
return (Imaging) ImagingError_ValueError("band index out of range");
/* Shortcuts */
if (imIn->bands == 1)
return ImagingCopy(imIn);
/* Special case for LXXA etc */
if (imIn->bands == 2 && band == 1)
band = 3;
imOut = ImagingNew("L", imIn->xsize, imIn->ysize);
if (!imOut)
return NULL;
/* Extract band from image */
for (y = 0; y < imIn->ysize; y++) {
UINT8* in = (UINT8*) imIn->image[y] + band;
UINT8* out = imOut->image8[y];
for (x = 0; x < imIn->xsize; x++) {
out[x] = *in;
in += 4;
}
}
return imOut;
}
Imaging
ImagingPutBand(Imaging imOut, Imaging imIn, int band)
{
int x, y;
/* Check arguments */
if (!imIn || imIn->bands != 1 || !imOut)
return (Imaging) ImagingError_ModeError();
if (band < 0 || band >= imOut->bands)
return (Imaging) ImagingError_ValueError("band index out of range");
if (imIn->type != imOut->type ||
imIn->xsize != imOut->xsize ||
imIn->ysize != imOut->ysize)
return (Imaging) ImagingError_Mismatch();
/* Shortcuts */
if (imOut->bands == 1)
return ImagingCopy2(imOut, imIn);
/* Special case for LXXA etc */
if (imOut->bands == 2 && band == 1)
band = 3;
/* Insert band into image */
for (y = 0; y < imIn->ysize; y++) {
UINT8* in = imIn->image8[y];
UINT8* out = (UINT8*) imOut->image[y] + band;
for (x = 0; x < imIn->xsize; x++) {
*out = in[x];
out += 4;
}
}
return imOut;
}
Imaging
ImagingFillBand(Imaging imOut, int band, int color)
{
int x, y;
/* Check arguments */
if (!imOut || imOut->type != IMAGING_TYPE_UINT8)
return (Imaging) ImagingError_ModeError();
if (band < 0 || band >= imOut->bands)
return (Imaging) ImagingError_ValueError("band index out of range");
/* Special case for LXXA etc */
if (imOut->bands == 2 && band == 1)
band = 3;
color = CLIP(color);
/* Insert color into image */
for (y = 0; y < imOut->ysize; y++) {
UINT8* out = (UINT8*) imOut->image[y] + band;
for (x = 0; x < imOut->xsize; x++) {
*out = (UINT8) color;
out += 4;
}
}
return imOut;
}
|
