47 lines
1.6 KiB
Python
47 lines
1.6 KiB
Python
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#!/usr/bin/env python3
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"""Makes the snap's icon from the app's: the same picture with rounded corners.
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The app's icon is a white square, which the Snap Store and the desktop's dock
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show as it is, so the snap's icon rounds its corners off to transparency. The
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radius, 142.222 of 512 pixels (about 28 %), is the one other desktop apps'
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white rounded tiles use. The mask is drawn at four times the size and scaled
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down, so the corners' edges are smooth.
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Run from the repository root with Python 3 and Pillow (python3-pil on Ubuntu):
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python3 tool/snap_icon.py
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It rewrites snap/gui/halkyon-learn.png (512 x 512 pixels, the Store's size),
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used by both the Store listing and the desktop file.
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"""
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from pathlib import Path
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from PIL import Image, ImageDraw
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SOURCE = Path("halkyon_learn_flutter/assets/icon/halkyon_icon.png")
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TARGET = Path("snap/gui/halkyon-learn.png")
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SIZE = 512
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RADIUS = 142.222
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SUPERSAMPLING = 4
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def main() -> None:
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icon = Image.open(SOURCE).convert("RGBA").resize((SIZE, SIZE), Image.LANCZOS)
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large = SIZE * SUPERSAMPLING
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mask = Image.new("L", (large, large), 0)
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ImageDraw.Draw(mask).rounded_rectangle(
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(0, 0, large - 1, large - 1), radius=RADIUS * SUPERSAMPLING, fill=255
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)
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mask = mask.resize((SIZE, SIZE), Image.LANCZOS)
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# Keeps what the icon itself makes transparent, and takes the corners away.
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transparent = Image.new("L", (SIZE, SIZE), 0)
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icon.putalpha(Image.composite(icon.getchannel("A"), transparent, mask))
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icon.save(TARGET, optimize=True)
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print(f"Wrote {TARGET} ({TARGET.stat().st_size} bytes).")
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if __name__ == "__main__":
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main()
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