97 lines
3.5 KiB
Python
97 lines
3.5 KiB
Python
 
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#!/usr/bin/env python3
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"""Rasterise icon.svg into the PNG sizes ui.py loads for the window icon.
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Tk 8.6 reads PNG but not SVG, so the icon ships pre-rendered in assets/. The
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glyph is laid on a rounded plate in the app's own colours: light on dark keeps
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it legible against both a light and a dark dock, which the bare SVG (slate grey
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on nothing) is not.
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Needs inkscape for the render and Pillow for the downscales. Run it after
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editing icon.svg, then ./install_desktop.sh to refresh the dock's copies.
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"""
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import re
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import shutil
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import subprocess
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import sys
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from pathlib import Path
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HERE = Path(__file__).resolve().parent
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SRC = HERE / "icon.svg"
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OUT = HERE / "assets"
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SIZES = (256, 128, 64, 48, 32, 16)
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PLATE = 64 # plate side, in the units the composite is drawn in
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GLYPH = 44 # how much of that side the glyph's longest edge covers
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RADIUS = 14 # corner rounding of the plate
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BG = "#2b2b2b" # ui.BAR
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FG = "#ededed" # ui.FG
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def glyph_box(svg):
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"""Bounding box of the drawing, in viewBox units.
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inkscape answers in the file's own pixel units, which are viewBox units
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only when width and viewBox agree — so convert.
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"""
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out = subprocess.run(["inkscape", "--query-all", str(svg)],
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capture_output=True, text=True, check=True).stdout
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line = next(l for l in out.splitlines() if l.startswith("svg"))
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x, y, w, h = (float(v) for v in line.split(",")[1:5])
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text = svg.read_text()
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width = float(re.search(r'\swidth="([\d.]+)"', text).group(1))
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vb_w = float(re.search(r'viewBox="[\d.\-]+ [\d.\-]+ ([\d.]+)', text).group(1))
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u = vb_w / width
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return x * u, y * u, w * u, h * u
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def main():
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if not SRC.is_file():
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sys.exit(f"{SRC.name} not found")
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if not shutil.which("inkscape"):
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sys.exit("inkscape not found — needed to rasterise the SVG")
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try:
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from PIL import Image
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except ImportError:
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sys.exit("Pillow not found — needed to downscale the render")
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d = re.search(r'\sd="([^"]+)"', SRC.read_text()).group(1)
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x, y, w, h = glyph_box(SRC)
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# Scale the glyph to GLYPH along its longest edge, then centre what that
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# leaves. The offsets cancel the bbox origin, which is not at 0,0.
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s = GLYPH / max(w, h)
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tx = (PLATE - w * s) / 2 - x * s
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ty = (PLATE - h * s) / 2 - y * s
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OUT.mkdir(exist_ok=True)
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composite = OUT / "_composite.svg"
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composite.write_text(
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f'<svg xmlns="http://www.w3.org/2000/svg" width="512" height="512" '
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f'viewBox="0 0 {PLATE} {PLATE}">\n'
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f' <rect width="{PLATE}" height="{PLATE}" rx="{RADIUS}" ry="{RADIUS}" '
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f'fill="{BG}"/>\n'
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f' <g transform="translate({tx:.4f} {ty:.4f}) scale({s:.6f})">\n'
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f' <path fill="{FG}" fill-rule="evenodd" clip-rule="evenodd" '
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f'd="{d}"/>\n'
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f' </g>\n</svg>\n')
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master = OUT / "_master.png"
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subprocess.run(["inkscape", "--export-type=png",
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f"--export-filename={master}", "-w", "512", "-h", "512",
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str(composite)], check=True, capture_output=True)
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img = Image.open(master).convert("RGBA")
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for size in SIZES:
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img.resize((size, size), Image.LANCZOS).save(OUT / f"icon-{size}.png")
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composite.unlink()
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master.unlink()
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print(f"glyph bbox {w:.2f}x{h:.2f} at ({x:.2f}, {y:.2f}) "
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f"-> scale {s:.3f}, offset ({tx:.2f}, {ty:.2f})")
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print("wrote " + ", ".join(f"icon-{s}.png" for s in SIZES) + f" in {OUT}")
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if __name__ == "__main__":
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main()
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