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71 lines
1.7 KiB
71 lines
1.7 KiB
import argparse
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import pathlib
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import sys
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from PIL import Image
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GREEN = (0, 255, 0)
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RED = (255, 0, 0)
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def generate_coll_map(in_path: str, out_path: str) -> None:
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png = Image.open(in_path).convert("RGB")
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assert png.height % 8 == 0 and png.width % 8 == 0
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out_bytes = []
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bits = []
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for y in range(png.height // 8):
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for x in range(png.width // 8):
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pixel = png.getpixel((x * 8, y * 8))
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bit = None
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if pixel == RED:
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bit = 1
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elif pixel == GREEN:
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bit = 0
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else:
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print(f"unsupported pixel in collision map {pixel}", file=sys.stderr)
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return
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bits.append(bit)
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if len(bits) == 8:
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byte = sum([bit << i for i, bit in enumerate(bits)])
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out_bytes.append(byte)
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bits = []
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lines = []
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for line_no in range(0, len(out_bytes), 16):
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line = out_bytes[line_no : line_no + 16]
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lines.append(" DB " + ", ".join(["$%02X" % b for b in line]))
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section = pathlib.Path(in_path).name.replace("_coll.png", "")
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all_lines = "\n".join(lines)
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with open(out_path, "wb") as outf:
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outf.write(
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f"""SECTION "{section.upper()} MAP", ROM0
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; Values are provided in tiles
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DEF {section}_width EQU {png.width // 8}
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DEF {section}_height EQU {png.height // 8}
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{section}_collision_map::
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{all_lines}
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""".encode(
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"utf-8"
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)
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)
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def main() -> None:
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parser = argparse.ArgumentParser("generate_coll_map")
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parser.add_argument("-o", "--output", required=True)
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parser.add_argument("png")
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args = parser.parse_args()
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generate_coll_map(args.png, args.output)
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if __name__ == "__main__":
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main()
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