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
|
#include <stdint.h>
#include <stdio.h>
#define STB_IMAGE_IMPLEMENTATION
#include "stb_image.h"
int
main(int argc, char **argv) {
if (argc != 2) {
fprintf(stderr, "usage: %s palette.png\n",
argv[0]);
return 1;
}
int pal_w, pal_h, pal_col_chans;
uint8_t *const pal_data =
stbi_load(argv[1], &pal_w, &pal_h, &pal_col_chans, 3);
if (pal_data == NULL) {
fprintf(stderr, "error: failed to load palette\n");
return 1;
}
if (pal_col_chans != 3) {
fprintf(stderr, "error: palette isn't RGB\n");
stbi_image_free(pal_data);
return 1;
}
if (pal_w * pal_h == 0) {
fprintf(stderr, "error: palette size is 0\n");
stbi_image_free(pal_data);
return 1;
}
if (pal_w * pal_h >= 256) {
fprintf(stderr, "error: palette size is greater than 255\n");
stbi_image_free(pal_data);
return 1;
}
printf("#include \"px.h\"\n\n"
"__attribute__((constructor))\n"
"static void set_pxpal(void)\n"
"{\n");
for (int i = 0; i < pal_w * pal_h; i++) {
printf("\tpxpal[%d].r = %u; "
"pxpal[%d].g = %u; "
"pxpal[%d].b = %u;\n",
i, (unsigned)pal_data[i * 3],
i, (unsigned)pal_data[i * 3 + 1],
i, (unsigned)pal_data[i * 3 + 2]);
}
printf("}\n");
}
|
