inkwell/packaging/icons.py

"""Every icon Inkwell ships, from one drawing.

The mark is a black inkpot with a quill standing in it, on the brand yellow.
It is drawn ONCE below, in a 512 box, and each variant places it
with its own scale, because each platform crops differently:

- icon.svg            the rounded tile: web favicon/PWA "any", desktop app icon
- icon-maskable.svg   full bleed, mark inside the central 80% (PWA "maskable")
- Android foreground  mark alone on transparency inside the 66dp safe circle of a
                      108dp adaptive canvas; the yellow is the background layer, and
                      the transparent mark is also what themed (monochrome) icons need

Run from the repo root after changing the drawing; needs rsvg-convert (librsvg).
Generated output is committed, like any other generated file.

    python3 packaging/icons.py
"""
import subprocess
from pathlib import Path

INK = "#18181b"
GOLD = "#F5C518"

# The quill is drawn upright at the pot mouth (0,0), then rotated into place.
QUILL_AT = "translate(256 232) rotate(34)"

QUILL_INK = f'''
    <g transform="{QUILL_AT}">
      <path d="M0 6 L0 -46" stroke="{INK}" stroke-width="12" stroke-linecap="round"/>
      <path d="M0 -34 C 46 -78 58 -176 4 -252 C -34 -196 -40 -104 0 -34 Z" fill="{INK}"/>
    </g>'''

POT_INK = f'''
    <path fill="{INK}" d="M222 262 C 166 268 140 300 140 338 L140 374 C140 396 156 410 178 410
       L334 410 C356 410 372 396 372 374 L372 338 C372 300 346 268 290 262 Z"/>
    <rect x="214" y="236" width="84" height="34" rx="9" fill="{INK}"/>
    <rect x="200" y="226" width="112" height="22" rx="11" fill="{INK}"/>'''

# The detail — the quill's shaft, two splits in its vane, the glint on the pot — is
# CUT OUT of the ink rather than painted over it in yellow. On the tile the two look
# the same; on Android's transparent foreground only a cut-out is right, because a
# themed icon draws the foreground's alpha as a silhouette, and painted detail
# would come out as solid, with the vane splits sticking out past its edge.
CUTS = '''
      <g transform="{at}">
        <path d="M1 -52 L3 -232" stroke-width="6" stroke-linecap="round"/>
        <path d="M62 -128 L30 -108 M64 -176 L32 -152" stroke-width="8"/>
      </g>
      <path d="M170 344 C 172 318 188 300 214 292" stroke-width="10" stroke-linecap="round"/>'''.format(at=QUILL_AT)

GLYPH = f'''
  <defs>
    <mask id="inkwell-cuts" maskUnits="userSpaceOnUse" x="0" y="0" width="512" height="512">
      <rect width="512" height="512" fill="#fff"/>
      <g stroke="#000" fill="none">{CUTS}
      </g>
    </mask>
  </defs>
  <g mask="url(#inkwell-cuts)">{QUILL_INK}{POT_INK}
  </g>'''
# Glyph bounds, measured from a render: centre the mark, then scale per variant.
CX, CY = 262, 226

def place(scale, cy=256):
    return f'translate(256 {cy}) scale({scale}) translate({-CX} {-CY})'

def svg(body, label=True):
    aria = ' role="img" aria-label="Inkwell"' if label else ''
    return f'<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"{aria}>\n{body}\n</svg>\n'

def tile(scale=0.92):
    return svg(f'''  <!-- Rounded-tile app icon: brand yellow, and the inkwell — a black inkpot with a
       quill standing in it. Source for every raster icon. -->
  <rect width="512" height="512" rx="112" fill="{GOLD}"/>
  <g transform="{place(scale)}">{GLYPH}
  </g>''')

def maskable(scale=0.8):
    return svg(f'''  <!-- Maskable variant: full-bleed background so platform masks (circle, squircle,
       rounded-square) never clip the mark, which sits inside the central 80% safe
       zone. Same mark as icon.svg. -->
  <rect width="512" height="512" fill="{GOLD}"/>
  <g transform="{place(scale)}">{GLYPH}
  </g>''')

def foreground(scale=0.64):
    # Android adaptive foreground: the mark alone on transparency, inside the 66dp
    # safe circle of a 108dp canvas. The yellow lives in the background layer.
    return svg(f'''  <g transform="{place(scale)}">{GLYPH}
  </g>''', label=False)


ROOT = Path(__file__).resolve().parent.parent
WEB = ROOT / "frontend" / "public"
DESKTOP = ROOT / "desktop" / "src-tauri"
ANDROID = ROOT / "android" / "app" / "src" / "main" / "res" / "mipmap-xxxhdpi"


def render(svg_text: str, size: int, out: Path, background: str | None = None) -> None:
    cmd = ["rsvg-convert", "-w", str(size), "-h", str(size), "-o", str(out)]
    if background:
        cmd += ["-b", background]
    subprocess.run(cmd, input=svg_text.encode(), check=True)


def main() -> None:
    icon, mask, fg = tile(), maskable(), foreground()
    (WEB / "icon.svg").write_text(icon)
    (WEB / "icon-maskable.svg").write_text(mask)

    render(icon, 32, WEB / "favicon-32.png")
    render(icon, 192, WEB / "icon-192.png")
    render(icon, 512, WEB / "icon-512.png")
    render(mask, 512, WEB / "icon-maskable-512.png")
    # iOS rounds the corners itself and shows transparency as black.
    render(mask, 180, WEB / "apple-touch-icon.png")

    render(icon, 1024, DESKTOP / "app-icon.png")
    render(icon, 32, DESKTOP / "icons" / "32x32.png")
    render(icon, 128, DESKTOP / "icons" / "128x128.png")
    render(icon, 256, DESKTOP / "icons" / "128x128@2x.png")
    render(icon, 512, DESKTOP / "icons" / "icon.png")

    render(fg, 512, ANDROID / "ic_launcher_foreground.png")


if __name__ == "__main__":
    main()