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