Adolfo Reyna
88 lines
2.7 KiB
Python
Executable File
88 lines
2.7 KiB
Python
Executable File
#!/usr/bin/env python3
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"""Convert an image to an uncompressed LVGL RGB565 launcher background."""
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import argparse
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import shutil
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import struct
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import subprocess
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from pathlib import Path
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LV_IMAGE_HEADER_MAGIC = 0x19
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LV_COLOR_FORMAT_RGB565 = 0x12
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def parse_args() -> argparse.Namespace:
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parser = argparse.ArgumentParser(
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description=(
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"Create an uncompressed LVGL .bin image for "
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"/sdcard/tactility/launcher/background.bin. Use a square image sized "
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"to the display's longest edge to support both orientations without scaling "
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"(for example, 320x320 for a 320x240 display)."
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)
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)
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parser.add_argument("input", type=Path, help="Source image")
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parser.add_argument("output", type=Path, help="Destination .bin file")
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parser.add_argument("--width", type=int, required=True, help="Output width")
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parser.add_argument("--height", type=int, required=True, help="Output height")
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return parser.parse_args()
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def main() -> None:
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args = parse_args()
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if args.width <= 0 or args.width > 65535 or args.height <= 0 or args.height > 65535:
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raise SystemExit("width and height must be between 1 and 65535")
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magick = shutil.which("magick")
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if magick is None:
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raise SystemExit("ImageMagick is required (the 'magick' command was not found)")
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command = [
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magick,
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str(args.input),
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"-resize",
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f"{args.width}x{args.height}^",
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"-gravity",
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"center",
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"-extent",
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f"{args.width}x{args.height}",
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"-depth",
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"8",
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"rgb:-",
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]
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rgb888 = subprocess.run(command, check=True, stdout=subprocess.PIPE).stdout
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expected_size = args.width * args.height * 3
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if len(rgb888) != expected_size:
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raise SystemExit(f"unexpected ImageMagick output: {len(rgb888)} bytes, expected {expected_size}")
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rgb565 = bytearray(args.width * args.height * 2)
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for source_offset in range(0, len(rgb888), 3):
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r, g, b = rgb888[source_offset : source_offset + 3]
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pixel = ((r >> 3) << 11) | ((g >> 2) << 5) | (b >> 3)
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destination_offset = (source_offset // 3) * 2
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struct.pack_into("<H", rgb565, destination_offset, pixel)
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stride = args.width * 2
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header = struct.pack(
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"<BBHHHHH",
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LV_IMAGE_HEADER_MAGIC,
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LV_COLOR_FORMAT_RGB565,
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0,
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args.width,
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args.height,
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stride,
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0,
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)
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args.output.parent.mkdir(parents=True, exist_ok=True)
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args.output.write_bytes(header + rgb565)
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print(
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f"Wrote {args.output} ({args.width}x{args.height}, "
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f"{len(header) + len(rgb565)} bytes, uncompressed RGB565)"
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)
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if __name__ == "__main__":
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main()
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