2ro
61 lines
1.8 KiB
Python
Executable File
61 lines
1.8 KiB
Python
Executable File
#!/usr/bin/env python3
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"""Build a macOS .icns from a square PNG, dependency-free.
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macOS has `iconutil` and Linux distros have `png2icns`, but neither is reliably
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present, and ImageMagick's own .icns writer only emits a single size. So we
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assemble the multi-resolution PNG-payload .icns container by hand (the format
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macOS 10.7+ accepts): the `icns` magic + big-endian length, then one entry per
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OSType, each carrying an 8-bit PNG. ImageMagick (`magick`) does the resizing.
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Usage: make-icns.py <source.png> <out.icns>
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"""
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import struct
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import subprocess
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import sys
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# OSType -> pixel size. PNG-payload entries. Sizes above the source are
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# Lanczos-upscaled (soft but acceptable for the few large Dock/Finder slots).
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SLOTS = [
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(b"icp4", 16),
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(b"icp5", 32),
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(b"icp6", 64),
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(b"ic07", 128),
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(b"ic08", 256),
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(b"ic11", 32), # 16@2x
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(b"ic12", 64), # 32@2x
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(b"ic13", 256), # 128@2x
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(b"ic09", 512), # 512
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(b"ic14", 512), # 256@2x
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]
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def render(src, size):
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out = "/tmp/_icns_%d.png" % size
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subprocess.run(
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["magick", src, "-resize", "%dx%d" % (size, size),
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"-filter", "Lanczos", "-depth", "8", "PNG32:%s" % out],
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check=True,
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)
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return open(out, "rb").read()
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def main():
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if len(sys.argv) != 3:
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sys.exit("usage: make-icns.py <source.png> <out.icns>")
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src, out = sys.argv[1], sys.argv[2]
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cache, entries = {}, []
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for ostype, size in SLOTS:
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if size not in cache:
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cache[size] = render(src, size)
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data = cache[size]
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entries.append(ostype + struct.pack(">I", 8 + len(data)) + data)
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body = b"".join(entries)
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with open(out, "wb") as f:
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f.write(b"icns" + struct.pack(">I", 8 + len(body)) + body)
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print("wrote %s (%d entries)" % (out, len(entries)))
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if __name__ == "__main__":
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main()
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