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#define PROGRAM_NAME "png_dimensions"
#define USAGE_OPTS "front.png front.dimensions"
#include "common.h"
uint8_t read_png_dimensions(const char *filename) {
uint32_t width_px = read_png_width(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_png_dimensions(argv[1]);
write_u8(argv[2], &output_byte, 1);
return 0;
}
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