Frank Schwenk
8abd7ddb59
Ergänzt Backfill- und Hilfsskripte, erzeugt nach der Pixazo-Generierung komprimierte srcset-Varianten, validiert leere Bilder und fügt Favicon, Web Manifest sowie Open-Graph-/Twitter-Tags in die Templates ein. Co-authored-by: Cursor <cursoragent@cursor.com>
91 lines
3.1 KiB
Python
91 lines
3.1 KiB
Python
"""Responsive JPEG variants for hero images."""
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from __future__ import annotations
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import re
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from pathlib import Path
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from PIL import Image
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VARIANT_WIDTHS = (360, 560, 800)
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JPEG_QUALITY = 82
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DATE_IMAGE_RE = re.compile(r"^(\d{4}-\d{2}-\d{2})\.jpg$")
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def image_public_path(date_iso: str, width: int | None = None) -> str:
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if width is None:
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return f"/img/{date_iso}.jpg"
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return f"/img/{date_iso}-{width}w.jpg"
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def build_srcset(date_iso: str, widths: list[int], full_width: int) -> str:
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parts = [f"{image_public_path(date_iso, w)} {w}w" for w in widths]
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parts.append(f"{image_public_path(date_iso)} {full_width}w")
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return ", ".join(parts)
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def create_responsive_variants(img_dir: Path, date_iso: str) -> dict[str, str] | None:
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source = img_dir / f"{date_iso}.jpg"
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if not source.exists():
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return None
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with Image.open(source) as im:
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im = im.convert("RGB")
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full_width, full_height = im.size
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generated: list[int] = []
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for width in VARIANT_WIDTHS:
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if width >= full_width:
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continue
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height = round(full_height * width / full_width)
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resized = im.resize((width, height), Image.Resampling.LANCZOS)
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out = img_dir / f"{date_iso}-{width}w.jpg"
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resized.save(out, "JPEG", quality=JPEG_QUALITY, optimize=True)
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generated.append(width)
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im.save(source, "JPEG", quality=JPEG_QUALITY, optimize=True)
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srcset = build_srcset(date_iso, generated, full_width)
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default_src = image_public_path(date_iso, 560) if 560 in generated else image_public_path(date_iso)
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thumb_src = image_public_path(date_iso, 360) if 360 in generated else image_public_path(date_iso)
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return {
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"src": default_src,
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"srcset": srcset,
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"sizes": "(max-width: 768px) 100vw, 560px",
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"og": image_public_path(date_iso),
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"thumb_src": thumb_src,
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"thumb_srcset": srcset,
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"thumb_sizes": "(max-width: 640px) 50vw, 360px",
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}
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def load_image_descriptor(img_dir: Path, date_iso: str) -> dict[str, str] | None:
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if not (img_dir / f"{date_iso}.jpg").exists():
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return None
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if not (img_dir / f"{date_iso}-360w.jpg").exists():
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return create_responsive_variants(img_dir, date_iso)
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widths = [w for w in VARIANT_WIDTHS if (img_dir / f"{date_iso}-{w}w.jpg").exists()]
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with Image.open(img_dir / f"{date_iso}.jpg") as im:
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full_width = im.size[0]
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srcset = build_srcset(date_iso, widths, full_width)
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return {
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"src": image_public_path(date_iso, 560) if 560 in widths else image_public_path(date_iso),
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"srcset": srcset,
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"sizes": "(max-width: 768px) 100vw, 560px",
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"og": image_public_path(date_iso),
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"thumb_src": image_public_path(date_iso, 360) if 360 in widths else image_public_path(date_iso),
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"thumb_srcset": srcset,
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"thumb_sizes": "(max-width: 640px) 50vw, 360px",
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}
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def iter_source_images(img_dir: Path) -> list[Path]:
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if not img_dir.exists():
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return []
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sources = []
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for path in sorted(img_dir.glob("*.jpg")):
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if DATE_IMAGE_RE.match(path.name):
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sources.append(path)
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return sources
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