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#include <stdint.h>
#include <stdio.h>
#define STB_IMAGE_IMPLEMENTATION
#include "stb_image.h"
static int grayscale(char **argv);
static int indexed(char **argv);
int
main(int argc, char **argv) {
if (argc != 3 && argc != 4) {
fprintf(stderr, "usage: %s name image.png [palette.png]\n",
argv[0]);
return 1;
}
if (argc == 3)
return grayscale(argv);
return indexed(argv);
}
static int
grayscale(char **argv)
{
int img_w, img_h, img_col_chans;
uint8_t *const img_data =
stbi_load(argv[2], &img_w, &img_h, &img_col_chans, 1);
if (img_data == NULL) {
fprintf(stderr, "error: failed to load image\n");
return 1;
}
if (img_col_chans != 1) {
fprintf(stderr, "error: image isn't grayscale\n");
stbi_image_free(img_data);
return 1;
}
if (img_h * img_w == 0) {
fprintf(stderr, "error: image size is 0\n");
stbi_image_free(img_data);
return 1;
}
printf("#include \"px.h\"\nconst PxSpr %s={%d,%d,(uint8_t[]){",
argv[1], img_w, img_h);
for (int i = 0; i < img_w * img_h; i++)
printf("%u,", (unsigned)img_data[i]);
printf("}};\n");
stbi_image_free(img_data);
return 0;
}
static int
indexed(char **argv)
{
/* read palette */
int pal_w, pal_h, pal_col_chans;
uint8_t *const pal_data =
stbi_load(argv[3], &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;
}
/* store unpacked palette */
const int pal_size = pal_w * pal_h;
uint8_t pal[256 * 3] = {0};
for (int i = 0; i < pal_size * 3; i++)
pal[i] = pal_data[i];
stbi_image_free(pal_data);
/* read image */
int img_w, img_h, img_col_chans;
uint8_t *const img_data =
stbi_load(argv[2], &img_w, &img_h, &img_col_chans, 3);
if (img_data == NULL) {
fprintf(stderr, "error: failed to load image\n");
return 1;
}
if (pal_col_chans != 3) {
fprintf(stderr, "error: image isn't RBG\n");
stbi_image_free(img_data);
return 1;
}
if (img_h * img_w == 0) {
fprintf(stderr, "error: image size is 0\n");
stbi_image_free(img_data);
return 1;
}
printf("#include \"px.h\"\nconst PxSpr %s={%d,%d,(uint8_t[]){",
argv[1], img_w, img_h);
for (int i = 0; i < img_w * img_h; i++) {
int col = -1;
for (int k = 0; k < pal_size; k++)
if (memcmp(pal + k * 3, img_data + i * 3, 3) == 0) {
col = k;
break;
}
if (col == -1) {
fprintf(stderr,
"color at pixel %d:%d not found in palette\n",
i % img_w, i / img_w);
stbi_image_free(img_data);
return 1;
}
printf("%d,", col);
}
printf("}};\n");
stbi_image_free(img_data);
return 0;
}
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