#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""raw2png.py — 将 meow_font_demo 产出的 480x720 RGB565(raw, little-endian uint16) 转成 PNG。

用法: raw2png.py <in.raw> <out.png>
"""
import sys
from PIL import Image

W, H = 480, 720


def main():
    raw = open(sys.argv[1], "rb").read()
    assert len(raw) == W * H * 2, f"expect {W * H * 2}, got {len(raw)}"
    out = sys.argv[2]
    img = Image.new("RGBA", (W, H), (0, 0, 0, 255))
    px = img.load()
    for y in range(H):
        base = y * W * 2
        for x in range(W):
            o = base + x * 2
            v = raw[o] | (raw[o + 1] << 8)  # LE uint16
            r = ((v >> 11) & 31) * 255 // 31
            g = ((v >> 5) & 63) * 255 // 63
            b = (v & 31) * 255 // 31
            px[x, y] = (r, g, b, 255)
    img.save(out)
    print(f"saved {out} ({W}x{H})")


if __name__ == "__main__":
    main()