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
|
/* See LICENSE file for copyright and license details. */
#include "common.h"
USAGE("[-c]")
static int per_channel = 0;
#define PROCESS(TYPE)\
do {\
typedef TYPE pixel_t[4];\
pixel_t matrix[9];\
pixel_t buf[2];\
int i;\
\
for (i = 0; i < 4; i++) {\
matrix[0][i] = 1, matrix[1][i] = 0, matrix[2][i] = 0;\
matrix[3][i] = 0, matrix[4][i] = 1, matrix[5][i] = 0;\
matrix[6][i] = 0, matrix[7][i] = 0, matrix[8][i] = 1;\
}\
\
while (eread_frame(stream, buf)) {\
if (per_channel) {\
for (i = 0; i < 4; i++) {\
matrix[2][i] = buf[0][i];\
matrix[5][i] = buf[1][i];\
}\
} else {\
matrix[2][3] = matrix[2][2] = matrix[2][1] = matrix[2][0] = buf[0][1] * buf[0][3];\
matrix[5][3] = matrix[5][2] = matrix[5][1] = matrix[5][0] = buf[1][1] * buf[1][3];\
}\
ewriteall(STDOUT_FILENO, matrix, sizeof(matrix), "<stdout>");\
}\
} while (0)
static void process_lf(struct stream *stream) { PROCESS(double); }
static void process_f(struct stream *stream) { PROCESS(float); }
int
main(int argc, char *argv[])
{
struct stream stream;
void (*process)(struct stream *stream);
ARGBEGIN {
case 'c':
per_channel = 1;
break;
default:
usage();
} ARGEND;
if (argc)
usage();
eopen_stream(&stream, NULL);
if (stream.width > 2 || stream.height > 2 || stream.width * stream.height != 2)
eprintf("<stdin>: each frame must contain exactly 2 pixels\n");
stream.width = 3;
stream.height = 3;
fprint_stream_head(stdout, &stream);
efflush(stdout, "<stdout>");
if (!strcmp(stream.pixfmt, "xyza"))
process = process_lf;
else if (!strcmp(stream.pixfmt, "xyza f"))
process = process_f;
else
eprintf("pixel format %s is not supported, try xyza\n", stream.pixfmt);
process(&stream);
return 0;
}
|
