A placed PNG, GIF or WebP that is cut off (an interrupted download) or
has a bad checksum made the whole PDF export fail with
"PDF writer error: Image(Image(ImageRepr {..}), None, "unexpected end of
file")", which names no file. A damaged TIFF or BMP in the same place is
skipped with the warning "image `name` could not be decoded and was
skipped", and the rest of the document is exported.
The exporter decides whether an image can be embedded by asking krilla
to open it. krilla opens PNG, GIF and WebP lazily: it reads the header,
accepts the file, and decodes the pixels only when the PDF is written,
where an error ends the export. TIFF and BMP are decoded by us first, so
they took the skip path.
lossless() now decodes the image first for every format. A file that
does not decode returns None and takes the existing skip-with-warning
path. This costs one extra decode per PNG, GIF or WebP asset: the sample
magazine (two PNGs, 820 KB) exports in 0.19 s instead of 0.17 s in a
debug build.
Co-authored-by: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Co-authored-by: Brandon Thomas <echelon@gmail.com>
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