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
|
/* See LICENSE file for copyright and license details. */
#include "common.h"
USAGE("operation")
/* Because the syntax for a function returning a function pointer is disgusting. */
typedef void (*process_func)(struct stream *stream);
#define LIST_OPERATORS(PIXFMT, TYPE)\
X(add, img[j & 3] + *buf, PIXFMT, TYPE)\
X(mul, img[j & 3] * *buf, PIXFMT, TYPE)\
X(min, MIN(img[j & 3], *buf), PIXFMT, TYPE)\
X(max, MAX(img[j & 3], *buf), PIXFMT, TYPE)
#define X(NAME, ALGO, PIXFMT, TYPE)\
static void\
process_##PIXFMT##_##NAME(struct stream *stream)\
{\
TYPE img[4], *buf;\
size_t i, n, j = 0, m = stream->frame_size / sizeof(*img);\
int first = 1;\
do {\
n = stream->ptr / stream->pixel_size * stream->n_chan;\
buf = (TYPE *)(stream->buf);\
for (i = 0; i < n; i++, buf++, j++, j %= m) {\
if (!j) {\
if (!first)\
ewriteall(STDOUT_FILENO, img, sizeof(img), "<stdout>");\
first = 0;\
img[0] = *buf++;\
img[1] = *buf++;\
img[2] = *buf++;\
img[3] = *buf;\
i += 3;\
j = 3;\
} else {\
img[j & 3] = ALGO;\
}\
}\
n *= sizeof(TYPE);\
memmove(stream->buf, stream->buf + n, stream->ptr -= n);\
} while (eread_stream(stream, SIZE_MAX));\
if (!first)\
ewriteall(STDOUT_FILENO, img, sizeof(img), "<stdout>");\
}
LIST_OPERATORS(lf, double)
LIST_OPERATORS(f, float)
#undef X
static process_func
get_process_lf(const char *operation)
{
#define X(NAME, _ALGO, PIXFMT, TYPE)\
if (!strcmp(operation, #NAME)) return process_##PIXFMT##_##NAME;
LIST_OPERATORS(lf, double)
#undef X
eprintf("algorithm not recognised: %s\n", operation);
return NULL;
}
static process_func
get_process_f(const char *operation)
{
#define X(NAME, _ALGO, PIXFMT, TYPE)\
if (!strcmp(operation, #NAME)) return process_##PIXFMT##_##NAME;
LIST_OPERATORS(f, float)
#undef X
eprintf("algorithm not recognised: %s\n", operation);
return NULL;
}
int
main(int argc, char *argv[])
{
struct stream stream;
process_func process;
UNOFLAGS(argc != 1);
eopen_stream(&stream, NULL);
echeck_dimensions(&stream, WIDTH | HEIGHT, NULL);
if (stream.encoding == DOUBLE)
process = get_process_lf(argv[0]);
else
process = get_process_f(argv[0]);
if (DPRINTF_HEAD(STDOUT_FILENO, stream.frames, 1, 1, stream.pixfmt) < 0)
eprintf("dprintf:");
process(&stream);
if (stream.ptr)
eprintf("%s: incomplete frame\n", stream.file);
return 0;
}
|
