scripts/build_fallbacks.py

from pathlib import Path

from PIL import Image, ImageEnhance, ImageFilter, ImageOps

from backend.engine import image_to_ascii

ROOT = Path(__file__).resolve().parent.parent
SOURCE = ROOT / "assets" / "fallback-master.png"
IMAGE_DIR = ROOT / "frontend" / "public" / "fallbacks"
ASCII_DIR = ROOT / "backend" / "fallback_ascii"


def main() -> None:
    IMAGE_DIR.mkdir(parents=True, exist_ok=True)
    ASCII_DIR.mkdir(parents=True, exist_ok=True)
    source = Image.open(SOURCE).convert("RGB")

    for index in range(20):
        angle = ((index % 5) - 2) * 1.2
        width, height = source.size
        inset_x = int(width * (index % 4) * 0.025)
        inset_y = int(height * ((index * 3) % 4) * 0.02)
        image = source.crop((inset_x, inset_y, width - inset_x, height - inset_y))
        image = image.rotate(angle, resample=Image.Resampling.BICUBIC, expand=False)
        image = ImageOps.fit(image, (768, 512), method=Image.Resampling.LANCZOS)
        image = ImageEnhance.Contrast(image).enhance(0.9 + (index % 5) * 0.09)
        image = ImageEnhance.Color(image).enhance(0.45 + (index % 4) * 0.22)
        if index % 3 == 0:
            image = image.filter(ImageFilter.GaussianBlur(radius=0.45))
        if index % 4 == 0:
            image = ImageOps.posterize(image, 5)

        image_path = IMAGE_DIR / f"fallback-{index + 1:02d}.webp"
        ascii_path = ASCII_DIR / f"fallback-{index + 1:02d}.txt"
        image.save(image_path, "WEBP", quality=76, method=6)
        ascii_path.write_text(image_to_ascii(image), encoding="utf-8")

    print("Generated 20 fallback images and ASCII files")


if __name__ == "__main__":
    main()