Regenerate installer icon using full-size artwork
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Esdras Renan
parent
275daa7c6e
commit
f3cb9038b7
8 changed files with 70 additions and 113 deletions
237
apps/desktop/scripts/generate_icon_assets.py
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237
apps/desktop/scripts/generate_icon_assets.py
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#!/usr/bin/env python3
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"""
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Generate icon PNGs/ICO for the desktop installer using the high-resolution Raven artwork.
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The script reads the square logo (`logo-raven-fund-azul.png`) and resizes it to the
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target sizes with a simple bilinear filter implemented with the Python standard library,
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avoiding additional dependencies.
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"""
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from __future__ import annotations
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import math
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import struct
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import zlib
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from binascii import crc32
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from pathlib import Path
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ICON_DIR = Path(__file__).resolve().parents[1] / "src-tauri" / "icons"
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BASE_IMAGE = ICON_DIR / "logo-raven-fund-azul.png"
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TARGET_SIZES = [32, 64, 128, 256, 512]
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def read_png(path: Path) -> tuple[int, int, list[list[tuple[int, int, int, int]]]]:
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data = path.read_bytes()
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if not data.startswith(b"\x89PNG\r\n\x1a\n"):
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raise ValueError(f"{path} is not a PNG")
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pos = 8
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width = height = bit_depth = color_type = None
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compressed_parts = []
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while pos < len(data):
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length = struct.unpack(">I", data[pos : pos + 4])[0]
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pos += 4
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ctype = data[pos : pos + 4]
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pos += 4
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chunk = data[pos : pos + length]
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pos += length
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pos += 4 # CRC
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if ctype == b"IHDR":
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width, height, bit_depth, color_type, _, _, _ = struct.unpack(">IIBBBBB", chunk)
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if bit_depth != 8 or color_type not in (2, 6):
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raise ValueError("Only 8-bit RGB/RGBA PNGs are supported")
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elif ctype == b"IDAT":
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compressed_parts.append(chunk)
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elif ctype == b"IEND":
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break
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if width is None or height is None or bit_depth is None or color_type is None:
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raise ValueError("PNG missing IHDR chunk")
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raw = zlib.decompress(b"".join(compressed_parts))
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bpp = 4 if color_type == 6 else 3
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stride = width * bpp
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rows = []
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idx = 0
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prev = bytearray(stride)
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for _ in range(height):
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filter_type = raw[idx]
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idx += 1
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row = bytearray(raw[idx : idx + stride])
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idx += stride
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if filter_type == 1:
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for i in range(stride):
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left = row[i - bpp] if i >= bpp else 0
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row[i] = (row[i] + left) & 0xFF
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elif filter_type == 2:
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for i in range(stride):
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row[i] = (row[i] + prev[i]) & 0xFF
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elif filter_type == 3:
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for i in range(stride):
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left = row[i - bpp] if i >= bpp else 0
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up = prev[i]
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row[i] = (row[i] + ((left + up) // 2)) & 0xFF
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elif filter_type == 4:
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for i in range(stride):
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left = row[i - bpp] if i >= bpp else 0
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up = prev[i]
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up_left = prev[i - bpp] if i >= bpp else 0
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p = left + up - up_left
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pa = abs(p - left)
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pb = abs(p - up)
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pc = abs(p - up_left)
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if pa <= pb and pa <= pc:
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pr = left
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elif pb <= pc:
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pr = up
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else:
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pr = up_left
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row[i] = (row[i] + pr) & 0xFF
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elif filter_type not in (0,):
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raise ValueError(f"Unsupported PNG filter type {filter_type}")
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rows.append(bytes(row))
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prev[:] = row
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pixels: list[list[tuple[int, int, int, int]]] = []
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for row in rows:
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if color_type == 6:
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pixels.append([tuple(row[i : i + 4]) for i in range(0, len(row), 4)])
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else:
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pixels.append([tuple(row[i : i + 3] + b"\xff") for i in range(0, len(row), 3)])
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return width, height, pixels
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def write_png(path: Path, width: int, height: int, pixels: list[list[tuple[int, int, int, int]]]) -> None:
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raw = bytearray()
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for row in pixels:
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raw.append(0) # filter type 0
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for r, g, b, a in row:
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raw.extend((r & 0xFF, g & 0xFF, b & 0xFF, a & 0xFF))
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compressed = zlib.compress(raw, level=9)
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def chunk(name: bytes, payload: bytes) -> bytes:
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return (
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struct.pack(">I", len(payload))
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+ name
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+ payload
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+ struct.pack(">I", crc32(name + payload) & 0xFFFFFFFF)
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)
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ihdr = struct.pack(">IIBBBBB", width, height, 8, 6, 0, 0, 0)
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out = bytearray(b"\x89PNG\r\n\x1a\n")
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out += chunk(b"IHDR", ihdr)
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out += chunk(b"IDAT", compressed)
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out += chunk(b"IEND", b"")
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path.write_bytes(out)
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def bilinear_sample(pixels: list[list[tuple[int, int, int, int]]], x: float, y: float) -> tuple[int, int, int, int]:
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height = len(pixels)
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width = len(pixels[0])
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x = min(max(x, 0.0), width - 1.0)
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y = min(max(y, 0.0), height - 1.0)
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x0 = int(math.floor(x))
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y0 = int(math.floor(y))
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x1 = min(x0 + 1, width - 1)
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y1 = min(y0 + 1, height - 1)
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dx = x - x0
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dy = y - y0
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def lerp(a: float, b: float, t: float) -> float:
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return a + (b - a) * t
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result = []
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for channel in range(4):
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c00 = pixels[y0][x0][channel]
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c10 = pixels[y0][x1][channel]
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c01 = pixels[y1][x0][channel]
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c11 = pixels[y1][x1][channel]
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top = lerp(c00, c10, dx)
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bottom = lerp(c01, c11, dx)
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result.append(int(round(lerp(top, bottom, dy))))
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return tuple(result)
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def resize_image(pixels: list[list[tuple[int, int, int, int]]], target: int) -> list[list[tuple[int, int, int, int]]]:
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src_height = len(pixels)
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src_width = len(pixels[0])
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scale = min(target / src_width, target / src_height)
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dest_width = max(1, int(round(src_width * scale)))
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dest_height = max(1, int(round(src_height * scale)))
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offset_x = (target - dest_width) // 2
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offset_y = (target - dest_height) // 2
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background = (0, 0, 0, 0)
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canvas = [[background for _ in range(target)] for _ in range(target)]
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for dy in range(dest_height):
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src_y = (dy + 0.5) / scale - 0.5
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for dx in range(dest_width):
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src_x = (dx + 0.5) / scale - 0.5
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canvas[offset_y + dy][offset_x + dx] = bilinear_sample(pixels, src_x, src_y)
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return canvas
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def build_ico(output: Path, png_paths: list[Path]) -> None:
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entries = []
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offset = 6 + 16 * len(png_paths)
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for path in png_paths:
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data = path.read_bytes()
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width, height, _ = read_png(path)
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entries.append(
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{
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"width": width if width < 256 else 0,
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"height": height if height < 256 else 0,
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"size": len(data),
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"offset": offset,
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"payload": data,
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}
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)
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offset += len(data)
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header = struct.pack("<HHH", 0, 1, len(entries))
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body = bytearray(header)
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for entry in entries:
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body.extend(
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struct.pack(
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"<BBBBHHII",
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entry["width"],
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entry["height"],
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0,
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0,
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1,
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32,
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entry["size"],
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entry["offset"],
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)
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)
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for entry in entries:
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body.extend(entry["payload"])
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output.write_bytes(body)
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def main() -> None:
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width, height, pixels = read_png(BASE_IMAGE)
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if width != height:
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raise ValueError("Base icon must be square")
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generated: list[Path] = []
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for size in TARGET_SIZES:
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resized = resize_image(pixels, size)
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out_path = ICON_DIR / f"icon-{size}.png"
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write_png(out_path, size, size, resized)
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generated.append(out_path)
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print(f"Generated {out_path} ({size}x{size})")
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largest = max(generated, key=lambda p: int(p.stem.split("-")[-1]))
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(ICON_DIR / "icon.png").write_bytes(largest.read_bytes())
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ico_sources = sorted(
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[p for p in generated if int(p.stem.split("-")[-1]) <= 256],
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key=lambda p: int(p.stem.split("-")[-1]),
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)
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build_ico(ICON_DIR / "icon.ico", ico_sources)
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print("icon.ico rebuilt.")
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if __name__ == "__main__":
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main()
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