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stet 0.3.0 — PDF→PDF round-trip

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@AndyCappDev AndyCappDev released this 12 Aug 20:28
· 103 commits to main since this release
v0.3.0
c901f21

Minor release adding PDF→PDF round-trip through the PDF output
device. A PDF parsed by stet-pdf-reader into the display list can now
be re-emitted as PDF with its prepress semantics preserved — spot
(Separation/DeviceN) colors, ICCBased spaces, overprint, soft masks,
transparency groups, optional-content layers, and /OutputIntents all
survive the round-trip rather than collapsing to flat process color.

This is a 0.x minor bump. The document-structure IR moved from
stet-core into stet-graphics (still re-exported by stet-core), so
code that reaches those types through stet-core is unaffected.

Highlights

  • PDF→PDF round-trip — --device pdf on a PDF input now routes
    through PdfDocument → PdfDevice, so a PDF can be read to the
    display list and written back out as PDF (previously only PS/EPS
    input reached PdfDevice).
  • Prepress color preserved — Separation/DeviceN spot colors (and
    their base spaces, with DeviceGray promotion), ICCBased fill/stroke
    spaces, and ICCBased bases inside Indexed image spaces all round-trip;
    /Catalog /OutputIntents is carried through so the CMYK-driving ICC
    profile is retained.
  • Overprint preserved — /OP//op forced on the first paint of
    each content stream, /OPM carried through the display list, and
    overprint state emitted for Image and Shading paints.
  • Transparency & layers emitted from the display list —
    DisplayElement::Group as a Form XObject, SoftMasked with per-paint
    alpha/blend, and DisplayElement::OcgGroup with /OCProperties
    optional-content groups.

Added

  • PDF output: Separation/DeviceN spot color + base round-trip,
    Separation/DeviceN shadings and spot imagemasks, and CMYK imagemask
    fill preservation.
  • PDF output: ICCBased fill/stroke color-space round-trip and ICCBased
    base preservation inside Indexed image color spaces.
  • PDF output: /Catalog /OutputIntents round-trip through PDF→PDF.
  • PDF output: Group → Form XObject, SoftMasked + per-paint
    alpha/blend, OcgGroup → /OCProperties, per-paint alpha on the
    Image and Shading writer arms, overprint state on Image/Shading, and
    /OPM round-trip.

Changed

  • Document-structure IR lifted from stet-core into stet-graphics
    (re-exported by stet-core).
  • PDF writer: graphics-state tracker restored across q/Q
    boundaries; replayed clips collapsed so a round-trip no longer grows
    the display list; implicit page-box clip skipped on PDF→PDF.
  • stet-pdf-reader: spot tint-transform table cached per content
    stream.
  • README: added a Commercial Support section.

Fixed

  • Removed a dead emit_fill_color_rgb helper, superseded by the
    DeviceColor-aware imagemask fill path (cleared a dead_code warning).

Crates published at 0.3.0

stet, stet-cli, stet-fonts, stet-graphics, stet-core,
stet-ops, stet-engine, stet-render, stet-viewer,
stet-pdf-reader, stet-pdf. The vendored stet-tiny-skia /
stet-tiny-skia-path forks remain at 0.11.4. stet-wasm remains at
0.1.1 (excluded from crates.io, independent cadence).

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