49 lines
1.6 KiB
Python
49 lines
1.6 KiB
Python
 
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#!/usr/bin/env python3
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"""Build static picker thumbnails for avatar decorations.
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The decorations are animated APNGs (~1 MB each). The settings picker shows
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static WebP thumbnails instead and only loads the animated file on hover,
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focus or selection, so browsing the catalog costs a few MB, not hundreds.
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Usage: python3 scripts/makeDecorationThumbs.py <dir-of-slug.png> <out-dir>
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Then upload <out-dir>/*.webp to `${DECORATION_CDN}/thumbs/`.
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A missing thumbnail is harmless: the picker falls back to the full PNG.
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Requires Pillow (pip install pillow).
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"""
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import sys
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from pathlib import Path
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from PIL import Image, ImageSequence
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SIZE = 144 # 2x the 72px picker cell
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def best_frame(im: Image.Image) -> Image.Image:
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# Many animations start (or loop through) an empty frame, so pick the frame
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# with the most visible pixels rather than frame 0.
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best, best_score = None, -1
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frames = list(ImageSequence.Iterator(im))
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step = max(1, len(frames) // 24)
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for frame in frames[::step]:
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rgba = frame.convert('RGBA')
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score = sum(rgba.getchannel('A').histogram()[33:])
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if score > best_score:
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best, best_score = rgba, score
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return best
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def main(src: str, out: str) -> None:
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out_dir = Path(out)
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out_dir.mkdir(parents=True, exist_ok=True)
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for png in sorted(Path(src).glob('*.png')):
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with Image.open(png) as im:
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thumb = best_frame(im).resize((SIZE, SIZE), Image.LANCZOS)
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thumb.save(out_dir / f'{png.stem}.webp', 'WEBP', quality=82, method=6)
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if __name__ == '__main__':
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if len(sys.argv) != 3:
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sys.exit(__doc__)
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main(sys.argv[1], sys.argv[2])
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