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#include <SDL.h>
#include <SDL_image.h>
#include <stdio.h>
Uint8 get_color(SDL_Surface *s, int x, int y) {
return ((Uint8*)s->pixels)[y*s->pitch+x];
}
Uint8 get_alpha(SDL_Surface *s, int x, int y) {
return s->format->palette->colors[((Uint8*)s->pixels)[y*s->pitch+x]].r;
}
void write_palette(FILE *out, SDL_Surface *s) {
int i;
Uint8 c = s->format->palette->ncolors - 1;
fwrite(&c, 1, 1, out);
for (i = 0; i < s->format->palette->ncolors; i++) {
fwrite(&s->format->palette->colors[i].r, 1, 1, out);
fwrite(&s->format->palette->colors[i].g, 1, 1, out);
fwrite(&s->format->palette->colors[i].b, 1, 1, out);
}
}
int main() {
FILE *outf = fopen("cross.dat", "wb");
SDL_Surface * colors = IMG_LoadPNG_RW(SDL_RWFromFile("cross_colors.png", "rb"));
SDL_Surface * mask = IMG_LoadPNG_RW(SDL_RWFromFile("cross_mask.png", "rb"));
printf("writing palette\n");
write_palette(outf, colors);
int n, x, y;
for (n = 0; n < 120; n++) {
for (y = 0; y < 32; y++) {
for (x = 0; x < 32; x++) {
Uint8 c = get_color(colors, x, n*32 + y);
fwrite(&c, 1, 1, outf);
c = get_alpha(mask, x, n*32 + y);
fwrite(&c, 1, 1, outf);
}
}
}
fclose(outf);
}
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