stet 0.1.0

[0.1.0] — 2026-04-18

Initial public release.

PostScript interpreter

• Level 3 interpreter with ~320 operators covering stack, math, type,
  dict, array, string, control, file, graphics state, path construction,
  painting, clipping, colour, font, show, image, halftone/transfer,
  pattern/device, resource, and param categories.
• Arena + entity-indirection memory model with full save/restore (COW).
• Dual VM (local/global) with unified stores and vm_alloc_mode.
• Name interning via NameTable; dict version cache for O(1) name
  resolution on the hot path.
• Full Type 1, CFF/Type 2, Type 3, TrueType, and Type 42 (CID) font
  support with URW substitutions for the 35 standard PostScript fonts.
• Eexec, ASCIIHex, ASCII85, RLE, Flate, LZW, DCT, SubFile, and their
  encode counterparts as streaming filters.
• CIE-based colour spaces (A/ABC/DEF/DEFG) and ICC-based via moxcms.
• Smooth shading types 1–7 (function, axial, radial, triangle meshes,
  Coons/tensor patches) with native PS function evaluation.

PDF reader (stet-pdf-reader)

• Self-contained PDF parser: xref (including xref streams), decryption
  (RC4/AES), object-stream decompression, page tree, resource
  resolution.
• Content-stream interpreter producing the same DisplayList type the
  PostScript interpreter produces — no dependency on stet-core.
• Transparency groups, soft masks (alpha & luminosity), tiling
  patterns, shadings 1–7.
• All standard stream filters including Flate (with PNG predictors),
  LZW, DCT (two backends), CCITT, JBIG2, JPEG 2000, ASCII85, ASCIIHex.
• Optional Content Groups (OCG) captured in the display list for future
  layer toggling.
• PDF OutputIntent profile honoured by default for PDF/X documents.
• CJK CMap loading (poppler-data / STET_CMAP_DIR).

Rendering (stet-render)

• tiny-skia–based rasterizer (vendored as stet-tiny-skia) producing
  RGBA output.
• Banded rendering sized to L2 cache; rayon-parallel band processing.
• Clip fast path with rect detection, mask caching, and spare mask
  recycling.
• Viewport rendering: render any rectangular region of a display list
  at any zoom without re-interpreting the source.
• ICC-aware CMYK path with black-point compensation and per-pixel
  consistency checks for transparency-group blending.
• Overprint simulation (OPM 0/1), including strict OPM-1 "preserve
  zero components" semantics.
• Hairline and stroke-adjust handling for thin lines.

PDF output (stet-pdf)

• Display list → PDF with embedded fonts (Type 1, TrueType, CFF),
  image compression, shadings, and transparency groups.
• Preserves native CMYK and spot colour spaces (Separation, DeviceN)
  without lossy RGB round-tripping.
• Pre-sampled transfer, halftone, and black-generation/UCR tables
  carried per paint element.
• Print-workflow quality output suitable for pre-press.

Viewer & frontends

• stet-viewer: egui desktop viewer with pan/zoom, minimap,
  multi-page navigation, and drag-and-drop.
• On-demand viewport rendering: zoom/pan without re-interpretation.
• WASM frontend (stet-wasm, excluded from the main workspace):
  browser-side PDF viewer with viewport rendering and SIMD-enabled
  tiny-skia.

Public library API (stet facade)

• Interpreter::new() / Interpreter::builder() for batteries-included
  PostScript rendering.
• render() → RGBA pages, render_to_display_list() → display lists,
  render_to_pdf() → PDF bytes, exec() → side-effects only.
• All 53 resources (fonts, encodings, CMaps, ICC profile) embedded in
  the binary via include_bytes!.
• Example programs: render_ps, render_pdf, display_list.

Workspace

• 13 crates under Apache-2.0 OR MIT, plus two vendored tiny-skia forks
  (stet-tiny-skia, stet-tiny-skia-path) under BSD-3-Clause.
• stet-pdf-reader is intentionally independent of stet-core — it
  can be used as a standalone PDF parser/renderer without pulling in
  the PostScript VM.