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
|
/* See LICENSE file for copyright and license details. */
#include "arg.h"
#include "util.h"
#include <inttypes.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
static void
usage(void)
{
eprintf("usage: %s [-f frames] -w width -h height red green blue [alpha]\n", argv0);
}
int
main(int argc, char *argv[])
{
int red, green, blue, alpha = 255;
size_t width = 0, height = 0, frames = 1;
unsigned char pixel[4];
size_t x, y, n;
int32_t buf[1024];
ssize_t r;
ARGBEGIN {
case 'f':
if (tozu(EARGF(usage()), 1, SIZE_MAX, &frames))
eprintf("argument of -f must be an integer in [1, %zu]\n", SIZE_MAX);
break;
case 'w':
if (tozu(EARGF(usage()), 1, SIZE_MAX, &width))
eprintf("argument of -w must be an integer in [1, %zu]\n", SIZE_MAX);
break;
case 'h':
if (tozu(EARGF(usage()), 1, SIZE_MAX, &height))
eprintf("argument of -h must be an integer in [1, %zu]\n", SIZE_MAX);
break;
default:
usage();
} ARGEND;
if (!width || !height || argc < 3 || argc > 4)
usage();
if (toi(argv[0], 0, 255, &red))
eprintf("the red value must be an integer in [0, 255]\n");
if (toi(argv[1], 0, 255, &green))
eprintf("the green value must be an integer in [0, 255]\n");
if (toi(argv[2], 0, 255, &blue))
eprintf("the blue value must be an integer in [0, 255]\n");
if (argc > 3 && toi(argv[3], 0, 255, &alpha))
eprintf("the alpha value must be an integer in [0, 255]\n");
pixel[0] = (unsigned char)red;
pixel[1] = (unsigned char)green;
pixel[2] = (unsigned char)blue;
pixel[3] = (unsigned char)alpha;
for (x = 0; x < ELEMENTSOF(buf); x++)
buf[x] = *(int32_t *)(void *)pixel;
while (frames--) {
for (y = height; y--;) {
for (x = width; x;) {
n = ELEMENTSOF(buf) < x ? ELEMENTSOF(buf) : x;
x -= n;
n *= sizeof(*buf);
while (n) {
r = write(STDOUT_FILENO, buf, n);
if (r < 0)
eprintf("write <stdout>:");
n -= (size_t)r;
}
}
}
}
efshut(stdout, "<stdout>");
return 0;
}
|
