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
|
/* See LICENSE file for copyright and license details. */
#include "stream.h"
#include "util.h"
#include <string.h>
USAGE("[-r]")
static size_t fm;
static double fm_double;
static float fm_float;
#define PROCESS(TYPE, NREV)\
do {\
size_t i;\
TYPE a;\
for (i = 0; i < n; i += stream->pixel_size) {\
a = ((TYPE *)(stream->buf + i))[3];\
a = a * (TYPE)(NREV f) / fm_##TYPE;\
((TYPE *)(stream->buf + i))[3] = a;\
}\
} while (0)
static void process_xyza (struct stream *stream, size_t n, size_t f) {PROCESS(double, fm -);}
static void process_xyza_r (struct stream *stream, size_t n, size_t f) {PROCESS(double,);}
static void process_xyzaf (struct stream *stream, size_t n, size_t f) {PROCESS(float, fm -);}
static void process_xyzaf_r(struct stream *stream, size_t n, size_t f) {PROCESS(float,);}
int
main(int argc, char *argv[])
{
struct stream stream;
int reverse = 0;
void (*process)(struct stream *stream, size_t n, size_t f);
ARGBEGIN {
case 'r':
reverse = 1;
break;
default:
usage();
} ARGEND;
if (argc)
usage();
eopen_stream(&stream, NULL);
if (!strcmp(stream.pixfmt, "xyza"))
process = reverse ? process_xyza_r : process_xyza;
else if (!strcmp(stream.pixfmt, "xyza f"))
process = reverse ? process_xyzaf_r : process_xyzaf;
else
eprintf("pixel format %s is not supported, try xyza\n", stream.pixfmt);
fprint_stream_head(stdout, &stream);
efflush(stdout, "<stdout>");
fm_double = fm = stream.frames - 1;
fm_float = (float)fm_double;
process_each_frame_segmented(&stream, STDOUT_FILENO, "<stdout>", process);
return 0;
}
|
