archy/image-recipe/branding/generate-plymouth-logo.py

#!/usr/bin/env python3
"""Generate the Archipelago Plymouth boot logo — pixel-art 'a' with neon glow.

Outputs a 256x256 PNG with transparent background (RGBA).
"""
import struct
import zlib
import math
import sys

W, H = 256, 256
ORANGE = (251, 146, 60)
ORANGE_BRIGHT = (255, 180, 100)

# Lowercase pixel-art "a" — 6x6 grid
LOGO_A = [
    [0, 1, 1, 1, 1, 0],
    [0, 0, 0, 0, 0, 1],
    [0, 1, 1, 1, 1, 1],
    [1, 0, 0, 0, 0, 1],
    [1, 0, 0, 0, 0, 1],
    [0, 1, 1, 1, 1, 1],
]

# "archipelago" text — same pixel font as GRUB generator
PIXEL_CHARS = {
    'a': [[0,1,1,0],[0,0,0,1],[0,1,1,1],[1,0,0,1],[0,1,1,1]],
    'r': [[1,0,1,1],[1,1,0,0],[1,0,0,0],[1,0,0,0],[1,0,0,0]],
    'c': [[0,1,1,0],[1,0,0,0],[1,0,0,0],[1,0,0,0],[0,1,1,0]],
    'h': [[1,0,0,0],[1,0,0,0],[1,1,1,0],[1,0,0,1],[1,0,0,1]],
    'i': [[0,1],[0,0],[0,1],[0,1],[0,1]],
    'p': [[1,1,1,0],[1,0,0,1],[1,1,1,0],[1,0,0,0],[1,0,0,0]],
    'e': [[0,1,1,0],[1,0,0,1],[1,1,1,0],[1,0,0,0],[0,1,1,0]],
    'l': [[1,0],[1,0],[1,0],[1,0],[1,1]],
    'g': [[0,1,1,1],[1,0,0,1],[0,1,1,1],[0,0,0,1],[1,1,1,0]],
    'o': [[0,1,1,0],[1,0,0,1],[1,0,0,1],[1,0,0,1],[0,1,1,0]],
    ' ': [[0,0],[0,0],[0,0],[0,0],[0,0]],
}


def create_png_rgba(width, height, pixels):
    """Create a PNG with RGBA pixel data."""
    def make_chunk(chunk_type, data):
        chunk = chunk_type + data
        return struct.pack('>I', len(data)) + chunk + struct.pack('>I', zlib.crc32(chunk) & 0xFFFFFFFF)

    signature = b'\x89PNG\r\n\x1a\n'
    ihdr_data = struct.pack('>IIBBBBB', width, height, 8, 6, 0, 0, 0)  # 8-bit RGBA
    ihdr = make_chunk(b'IHDR', ihdr_data)

    raw_data = bytearray()
    for y in range(height):
        raw_data.append(0)
        offset = y * width * 4
        raw_data.extend(pixels[offset:offset + width * 4])

    compressed = zlib.compress(bytes(raw_data), 9)
    idat = make_chunk(b'IDAT', compressed)
    iend = make_chunk(b'IEND', b'')

    return signature + ihdr + idat + iend


def generate():
    pixels = bytearray(W * H * 4)  # RGBA

    cx, cy = W // 2, W // 2 - 30

    logo_rows = len(LOGO_A)
    logo_cols = len(LOGO_A[0])
    pixel_size = 18
    logo_w = logo_cols * pixel_size
    logo_h = logo_rows * pixel_size
    logo_x = cx - logo_w // 2
    logo_y = 30

    # Glow
    glow_radius = 60
    for y in range(H):
        for x in range(W):
            dx = max(0, logo_x - x, x - (logo_x + logo_w))
            dy = max(0, logo_y - y, y - (logo_y + logo_h))
            d = math.sqrt(dx * dx + dy * dy)
            if d < glow_radius:
                alpha = (1.0 - d / glow_radius) ** 2 * 0.25
                idx = (y * W + x) * 4
                pixels[idx] = ORANGE[0]
                pixels[idx + 1] = ORANGE[1]
                pixels[idx + 2] = ORANGE[2]
                pixels[idx + 3] = int(alpha * 255)

    # Logo pixels with 3D bevel
    for row in range(logo_rows):
        for col in range(logo_cols):
            if LOGO_A[row][col]:
                px = logo_x + col * pixel_size
                py = logo_y + row * pixel_size
                for dy in range(pixel_size - 1):
                    for dx in range(pixel_size - 1):
                        x, y = px + dx, py + dy
                        if 0 <= x < W and 0 <= y < H:
                            t = (dx + dy) / (2 * pixel_size)
                            r = int(ORANGE[0] * (1.0 - t * 0.3))
                            g = int(ORANGE[1] * (1.0 - t * 0.3))
                            b = int(ORANGE[2] * (1.0 - t * 0.3))
                            if dx < 2 or dy < 2:
                                r = min(255, r + 40)
                                g = min(255, g + 30)
                                b = min(255, b + 10)
                            idx = (y * W + x) * 4
                            pixels[idx] = r
                            pixels[idx + 1] = g
                            pixels[idx + 2] = b
                            pixels[idx + 3] = 255

    # Text "archipelago" below logo
    text = "archipelago"
    text_pixel = 3
    text_gap = 2
    total_w = sum(len(PIXEL_CHARS.get(c, PIXEL_CHARS[' '])[0]) * text_pixel + text_gap for c in text) - text_gap
    text_x = cx - total_w // 2
    text_y = logo_y + logo_h + 16
    cursor = text_x
    for ch in text:
        char_data = PIXEL_CHARS.get(ch, PIXEL_CHARS[' '])
        for row in range(len(char_data)):
            for col in range(len(char_data[0])):
                if char_data[row][col]:
                    for dy in range(text_pixel - 1):
                        for dx in range(text_pixel - 1):
                            x = cursor + col * text_pixel + dx
                            y = text_y + row * text_pixel + dy
                            if 0 <= x < W and 0 <= y < H:
                                idx = (y * W + x) * 4
                                pixels[idx] = 180
                                pixels[idx + 1] = 100
                                pixels[idx + 2] = 30
                                pixels[idx + 3] = 200
        cursor += len(char_data[0]) * text_pixel + text_gap

    return create_png_rgba(W, H, bytes(pixels))


if __name__ == '__main__':
    out_path = sys.argv[1] if len(sys.argv) > 1 else 'logo.png'
    data = generate()
    with open(out_path, 'wb') as f:
        f.write(data)
    print(f'Generated {out_path} ({len(data)} bytes)')