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Alex
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#!/usr/bin/env python3
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"""Generates the alternate app icon assets for Android and iOS.
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Recolors the five petals of the Immich logo for each icon variant and emits:
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- assets/app-icons/app-icon-<id>.svg (in-app previews)
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- android res: drawable/ic_launcher_foreground_<id>.xml,
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mipmap-anydpi-v26/ic_launcher_<id>.xml,
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values/app_icon_colors.xml
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- ios: Assets.xcassets/AppIcon<Name>.appiconset/{Contents.json,1024.png}
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The iOS PNGs are rendered with macOS `qlmanage`, so this script must run on
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macOS. Run it from anywhere: `python3 mobile/scripts/generate_app_icons.py`.
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"""
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import json
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import re
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import shutil
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import struct
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import subprocess
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import sys
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import tempfile
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import zlib
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from pathlib import Path
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MOBILE = Path(__file__).resolve().parent.parent
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# Original petal colors, in SVG document order:
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# top (red), upper-left (pink), upper-right (yellow),
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# lower-left (blue), lower-right (green)
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BASE_PETALS = ["#FA2921", "#ED79B5", "#FFB400", "#1E83F7", "#18C249"]
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BASE_BACKGROUND = "#FFFFFF"
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# id -> (asset suffix, background, petal colors in BASE_PETALS order).
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# "classic" is the default icon and only gets a preview SVG; its native
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# assets are the stock ic_launcher / AppIcon.
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VARIANTS = {
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"classic": (BASE_BACKGROUND, BASE_PETALS),
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"midnight": ("#0F172A", BASE_PETALS),
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"ocean": ("#FFFFFF", ["#0284C7", "#38BDF8", "#1D4ED8", "#0891B2", "#14B8A6"]),
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"sunset": ("#1E1B4B", ["#F97316", "#7C3AED", "#FACC15", "#C026D3", "#F43F5E"]),
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"forest": ("#FFFFFF", ["#16A34A", "#84CC16", "#4ADE80", "#15803D", "#65A30D"]),
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"blossom": ("#FFF1F2", ["#E11D48", "#FB7185", "#F472B6", "#BE185D", "#F9A8D4"]),
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"ink": ("#FFFFFF", ["#111827", "#6B7280", "#374151", "#9CA3AF", "#4B5563"]),
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"neon": ("#0A0A12", ["#FF2D95", "#00E5FF", "#FFD600", "#7C4DFF", "#00FF9D"]),
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"gold": ("#1C1917", ["#FBBF24", "#FDE68A", "#F59E0B", "#D97706", "#FCD34D"]),
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}
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def recolor(text: str, petals: list[str]) -> str:
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for base, new in zip(BASE_PETALS, petals):
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pattern = re.compile(re.escape(base), re.IGNORECASE)
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text = pattern.sub(new, text)
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return text
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def petal_paths() -> str:
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svg = (MOBILE / "assets" / "immich-logo.svg").read_text()
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return "\n".join(re.findall(r"<path[^>]*/>", svg))
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def icon_svg(background: str, petals: list[str], size: int) -> str:
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# The flower spans the full 192px viewBox; scale it down so the icon
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# keeps the same padding as the original iOS app icon.
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scale = 0.78
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offset = 192 * (1 - scale) / 2
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paths = recolor(petal_paths(), petals)
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return f"""<svg width="{size}" height="{size}" viewBox="0 0 192 192" fill="none" xmlns="http://www.w3.org/2000/svg">
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<rect width="192" height="192" fill="{background}"/>
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<g transform="translate({offset:g} {offset:g}) scale({scale})">
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{paths}
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</g>
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</svg>
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"""
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def write_previews() -> None:
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out = MOBILE / "assets" / "app-icons"
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out.mkdir(exist_ok=True)
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for variant, (background, petals) in VARIANTS.items():
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(out / f"app-icon-{variant}.svg").write_text(icon_svg(background, petals, 192))
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print(f"previews: {out}")
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def write_android() -> None:
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res = MOBILE / "android" / "app" / "src" / "main" / "res"
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foreground = (res / "drawable" / "ic_launcher_foreground.xml").read_text()
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colors = ['<?xml version="1.0" encoding="utf-8"?>', "<resources>"]
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for variant, (background, petals) in VARIANTS.items():
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if variant == "classic":
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continue
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(res / "drawable" / f"ic_launcher_foreground_{variant}.xml").write_text(
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recolor(foreground, petals)
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)
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colors.append(f' <color name="ic_launcher_background_{variant}">{background}</color>')
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(res / "mipmap-anydpi-v26" / f"ic_launcher_{variant}.xml").write_text(
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f"""<?xml version="1.0" encoding="utf-8"?>
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<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
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<background android:drawable="@color/ic_launcher_background_{variant}"/>
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<foreground android:drawable="@drawable/ic_launcher_foreground_{variant}"/>
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<monochrome android:drawable="@drawable/ic_launcher_monochrome"/>
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</adaptive-icon>
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"""
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)
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colors.append("</resources>")
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(res / "values" / "app_icon_colors.xml").write_text("\n".join(colors) + "\n")
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print(f"android res: {res}")
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def strip_alpha(png: bytes) -> bytes:
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"""Re-encodes an RGBA PNG as opaque RGB (required for app icons)."""
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assert png[:8] == b"\x89PNG\r\n\x1a\n"
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pos, chunks, idat = 8, [], b""
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width = height = bit_depth = color_type = None
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while pos < len(png):
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(length,) = struct.unpack(">I", png[pos : pos + 4])
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kind = png[pos + 4 : pos + 8]
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data = png[pos + 8 : pos + 8 + length]
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pos += 12 + length
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if kind == b"IHDR":
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width, height, bit_depth, color_type = struct.unpack(">IIBB", data[:10])
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if kind == b"IDAT":
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idat += data
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else:
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chunks.append((kind, data))
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if color_type != 6 or bit_depth != 8:
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return png # already opaque
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raw = zlib.decompress(idat)
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stride = width * 4
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rgb = bytearray()
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previous = bytearray(width * 4)
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for y in range(height):
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row_start = y * (stride + 1)
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filter_type = raw[row_start]
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row = bytearray(raw[row_start + 1 : row_start + 1 + stride])
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for x in range(stride):
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a = row[x - 4] if x >= 4 else 0
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b = previous[x]
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c = previous[x - 4] if x >= 4 else 0
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if filter_type == 1:
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row[x] = (row[x] + a) & 0xFF
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elif filter_type == 2:
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row[x] = (row[x] + b) & 0xFF
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elif filter_type == 3:
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row[x] = (row[x] + (a + b) // 2) & 0xFF
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elif filter_type == 4:
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p = a + b - c
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pa, pb, pc = abs(p - a), abs(p - b), abs(p - c)
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pred = a if pa <= pb and pa <= pc else b if pb <= pc else c
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row[x] = (row[x] + pred) & 0xFF
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previous = row
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rgb.append(0)
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for x in range(width):
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rgb += row[x * 4 : x * 4 + 3]
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out = bytearray(b"\x89PNG\r\n\x1a\n")
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def chunk(kind: bytes, data: bytes) -> None:
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out.extend(struct.pack(">I", len(data)))
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out.extend(kind)
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out.extend(data)
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out.extend(struct.pack(">I", zlib.crc32(kind + data)))
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chunk(b"IHDR", struct.pack(">IIBBBBB", width, height, 8, 2, 0, 0, 0))
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chunk(b"IDAT", zlib.compress(bytes(rgb), 9))
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chunk(b"IEND", b"")
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return bytes(out)
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def write_ios() -> None:
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xcassets = MOBILE / "ios" / "Runner" / "Assets.xcassets"
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with tempfile.TemporaryDirectory() as tmp_dir:
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tmp = Path(tmp_dir)
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for variant, (background, petals) in VARIANTS.items():
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if variant == "classic":
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continue
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svg = tmp / f"{variant}.svg"
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svg.write_text(icon_svg(background, petals, 1024))
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subprocess.run(
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["qlmanage", "-t", "-s", "1024", "-o", tmp_dir, str(svg)],
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check=True,
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capture_output=True,
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)
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rendered = tmp / f"{variant}.svg.png"
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if not rendered.exists():
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sys.exit(f"qlmanage failed to render {svg}")
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iconset = xcassets / f"AppIcon{variant.capitalize()}.appiconset"
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shutil.rmtree(iconset, ignore_errors=True)
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iconset.mkdir()
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(iconset / "1024.png").write_bytes(strip_alpha(rendered.read_bytes()))
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(iconset / "Contents.json").write_text(
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json.dumps(
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{
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"images": [
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{
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"filename": "1024.png",
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"idiom": "universal",
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"platform": "ios",
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"size": "1024x1024",
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}
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],
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"info": {"author": "xcode", "version": 1},
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},
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indent=2,
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)
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+ "\n"
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)
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print(f"ios appiconsets: {xcassets}")
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if __name__ == "__main__":
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write_previews()
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write_android()
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write_ios()
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