Release Vulpes OS 2.7-preview.22

tundra/tools/prepare-beatles-cover-animation.py

@@ -0,0 +1,40 @@
+#!/usr/bin/env python3
+# SPDX-License-Identifier: MPL-2.0
+"""Decode a private GIF test into bounded RGB565 frames for the cover panel."""
+import argparse
+from array import array
+from pathlib import Path
+import struct
+import sys
+from PIL import Image, ImageOps
+
+
+def prepare(source, destination):
+    if source.stat().st_size > 16 * 1024 * 1024:
+        raise ValueError('GIF exceeds 16 MiB')
+    with Image.open(source) as image:
+        if image.format != 'GIF' or not 1 <= image.n_frames <= 240:
+            raise ValueError('Expected a GIF with at most 240 frames')
+        if image.width * image.height > 4_000_000:
+            raise ValueError('GIF dimensions exceed limit')
+        with destination.open('wb') as output:
+            output.write(b'VULPANM1' + struct.pack('<I', image.n_frames))
+            for index in range(image.n_frames):
+                image.seek(index)
+                duration = max(50, min(1000, int(image.info.get('duration', 100))))
+                fitted = ImageOps.contain(image.convert('RGB'), (240, 240), Image.Resampling.LANCZOS)
+                frame = Image.new('RGB', (240, 240))
+                frame.paste(fitted, ((240-fitted.width)//2, (240-fitted.height)//2))
+                rgb=frame.tobytes()
+                pixels = array('H', (((r>>3)<<11) | ((g>>2)<<5) | (b>>3)
+                                    for r,g,b in zip(rgb[0::3],rgb[1::3],rgb[2::3])))
+                if sys.byteorder != 'little': pixels.byteswap()
+                output.write(struct.pack('<I', duration)); output.write(pixels.tobytes())
+    return destination.stat().st_size
+
+
+if __name__ == '__main__':
+    parser=argparse.ArgumentParser(description=__doc__)
+    parser.add_argument('source',type=Path);parser.add_argument('destination',type=Path)
+    args=parser.parse_args()
+    print('Cover animation bytes:',prepare(args.source,args.destination))