compatibility "1.3" writes a %PDF-1.3 file (its XMP metadata says 1.3
too) without transparency: a copy of the document is flattened first
with flattenerPreset (stored with PDF presets; empty is High Resolution)
and the flattener options over it, see-through image pixels counting as
transparency and rasterized areas clipped to their regions so no soft
mask is needed. Page groups are left out and the writer refuses a file
that would still have transparency. PDF/X-1a and PDF/X-3 share this
path (their version is now PDF 1.3; 1.4 is still accepted and written
as 1.3), and with it the preset, the header and metadata code and the
transparency check. Passwords at PDF 1.3 encrypt with 40-bit RC4
(revision 2). The Save PDF dialog lists PDF 1.3 and picks the flattener
preset under Advanced.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Embed Page Thumbnails gives every page a /Thumb image: the page drawn on
white, 106 px on its long side, without the layers the page leaves out
(the engine draws them; vectorcraft_pdf::page_areas says what each page
shows; PDF/X files get grey ones). Optimize for Fast Web View writes a
linearised file: the objects are put in linearised order and numbering,
encrypted when a password asks (the encryption dictionary goes with the
catalog, PDF layers' groups too), then laid out with the linearization
dictionary, both cross-reference tables and the page offset and shared
object hint tables (the hint stream encrypted like any other). Their
"not applied yet" warnings are gone. Reading the objects back uses the
lexer of encrypt.rs (syntax.rs adds what rewriting needs).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
