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
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
|
/* See LICENSE file for copyright and license details. */
#include "arg.h"
#include "util.h"
#include <sys/wait.h>
#include <string.h>
#include <unistd.h>
static double
get_value(void *buffer)
{
unsigned char *buf = buffer;
unsigned long int value;
double ret;
value = (unsigned long int)(buf[0]) << 12;
value += (unsigned long int)(buf[1]) << 8;
value += (unsigned long int)(buf[2]) << 4;
value += (unsigned long int)(buf[3]);
ret = value;
value = 1UL << 15;
value |= value - 1;
ret /= value;
return ret;
}
static void
usage(void)
{
eprintf("usage: %s\n", argv0);
}
int
main(int argc, char *argv[])
{
int pipe_rw[2];
int i, old_fd;
pid_t pid;
int status;
char buf[8096];
size_t ptr, ptw, n;
char *p;
ssize_t r;
double red, green, blue, pixel[4];
char width[3 * sizeof(size_t) + 1] = {0};
char height[3 * sizeof(size_t) + 1] = {0};
ARGBEGIN {
default:
usage();
} ARGEND;
if (argc)
usage();
if (pipe(pipe_rw))
eprintf("pipe:");
if (pipe_rw[0] == STDIN_FILENO || pipe_rw[1] == STDIN_FILENO)
eprintf("no stdin open\n");
if (pipe_rw[0] == STDOUT_FILENO || pipe_rw[1] == STDOUT_FILENO)
eprintf("no stdout open\n");
for (i = 0; i < 2; i++) {
if (pipe_rw[i] == STDERR_FILENO) {
pipe_rw[i] = dup(old_fd = pipe_rw[i]);
if (pipe_rw[i] < 0)
eprintf("dup:");
close(old_fd);
}
}
pid = fork();
if (pid < 0)
eprintf("fork:");
if (!pid) {
close(pipe_rw[0]);
if (dup2(pipe_rw[1], STDOUT_FILENO) < 0)
eprintf("dup2:");
close(pipe_rw[1]);
/* XXX Is there a way to convert directly to raw XYZ? (Would avoid gamut truncation) */
execlp("convert", "convert", "-", "-depth", "32", "-alpha", "activate", "pam:-", NULL);
eprintf("exec convert:");
}
close(pipe_rw[1]);
for (ptr = 0;;) {
r = read(pipe_rw[0], buf + ptr, sizeof(buf) - ptr);
if (r < 0)
eprintf("read <subprocess>:");
if (r == 0)
eprintf("convertion failed\n");
ptr += (size_t)r;
for (;;) {
p = memchr(buf, '\n', ptr);
if (!p) {
if (ptr == sizeof(buf))
eprintf("convertion failed\n");
break;
}
*p++ = '\0';
if (strstr(buf, "WIDTH ") == buf) {
if (*width || !buf[6] || strlen(buf + 6) >= sizeof(width))
eprintf("convertion failed\n");
strcpy(width, buf + 6);
} else if (strstr(buf, "HEIGHT ") == buf) {
if (*height || !buf[7] || strlen(buf + 7) >= sizeof(height))
eprintf("convertion failed\n");
strcpy(height, buf + 7);
} else if (!strcmp(buf, "ENDHDR")) {
memmove(buf, p, ptr -= (size_t)(p - buf));
goto header_done;
}
memmove(buf, p, ptr -= (size_t)(p - buf));
}
}
header_done:
if (!*width || !*height)
eprintf("convertion failed\n");
printf("%s %s xyza\n%cuivf", width, height, 0);
fflush(stdout);
if (ferror(stdout))
eprintf("<stdout>:");
for (;;) {
for (ptr = 0; ptr + 15 < n; ptr += 16) {
red = get_value(buf + ptr + 0);
green = get_value(buf + ptr + 4);
blue = get_value(buf + ptr + 8);
pixel[3] = get_value(buf + ptr + 12);
srgb_to_ciexyz(red, green, blue, pixel + 0, pixel + 1, pixel + 2);
for (ptw = 0; ptw < sizeof(pixel); ptw += (size_t)r) {
r = write(STDOUT_FILENO, (char *)pixel + ptw, sizeof(pixel) - ptw);
if (r < 0)
eprintf("write <stdout>:");
}
}
r = read(pipe_rw[0], buf, sizeof(buf));
if (r < 0)
eprintf("read <subprocess>:");
if (r == 0)
break;
n = (size_t)r;
}
while (waitpid(pid, &status, 0) != pid);
return !!status;
}
|
