ref: c8f06f45d59bf1008e98497481629edc77993300
dir: /tools/png_dimensions.c/
#include "common.h"
void usage() {
fputs("Usage: png_dimensions in.png out.dimensions\n", stderr);
}
uint8_t read_dimensions(const char *filename) {
uint32_t width_px = read_png_width_verbose(filename);
if (width_px != 40 && width_px != 48 && width_px != 56) {
error_exit("Not a valid width for \"%s\": %" PRIu32 " px\n", filename, width_px);
}
uint8_t width_tiles = (uint8_t)(width_px / 8);
return (width_tiles << 4) | width_tiles;
}
int main(int argc, char *argv[]) {
if (argc < 3) {
usage();
exit(1);
}
uint8_t output_byte = read_dimensions(argv[1]);
write_u8(argv[2], &output_byte, 1);
return 0;
}