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Fix #4938: Dynamic symbols keep per-instance appearance linked to the symbol

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bflatastic
2026-11-01 04:53:38 +07:00
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docs/file-format-parity.md
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# File format parity
> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-11-01 · **Change:** minor (exports draw artboard background colors, #4937) · **Target:** Adobe Illustrator 2026 (30.x)
> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-11-01 · **Change:** minor (native format: dynamic symbols, #4938) · **Target:** Adobe Illustrator 2026 (30.x)
Every format Illustrator opens, places, saves or exports, against VectorCraft's format table (`FORMATS`,
`OPEN_EXTS`, `PLACE_EXTS` in `crates/engine/src/cmd/fileio/formats.rs`). Illustrator's list comes from its public
@@ -90,7 +90,7 @@ the app's own editing copy of a file (an EPS after its `%%EOF`, a `.ai`'s `AIPri
| Format | Illustrator | Ours: open/place | Ours: save/export | Fidelity and tests |
|---|---|---|---|---|
| VectorCraft `.vectorcraft` / `.vctemplate` | — | yes | yes | lossless JSON, versioned, save down to v1; property-tested round trips (`format/tests/prop_format.rs`); documents with a lot of path data are written as compact JSON, about a fifth of the size (#1492); a save falls back to a plain fsync and to writing elsewhere and copying in when the folder refuses the usual steps (#1625, #1649, part of #1620; not confirmed on a real network share); the size limits on embedded data also apply to files read from memory (#1783), and saving over a private file on Unix leaves no readable temporary copy beside it (#1778) |
| VectorCraft `.vectorcraft` / `.vctemplate` | — | yes | yes | lossless JSON, versioned, save down to v1; property-tested round trips (`format/tests/prop_format.rs`); documents with a lot of path data are written as compact JSON, about a fifth of the size (#1492); a save falls back to a plain fsync and to writing elsewhere and copying in when the folder refuses the usual steps (#1625, #1649, part of #1620; not confirmed on a real network share); the size limits on embedded data also apply to files read from memory (#1783), and saving over a private file on Unix leaves no readable temporary copy beside it (#1778); a dynamic symbol's type (`dynamic` on the symbol) and an instance's appearance changes to its art (`symbol_overrides`, each path at most 64 deep, counted against the object budget) are written only when set, so documents without them save as before (#4938) |
| Illustrator template `.ait` | open, save | yes | PDF-compatible only, from Save as Template (`.vctemplate` stays its default) | New from Template opens a saved `.ait` untitled with its layers and art (`tests_pdfedit.rs`) |
| Illustrator `.ai` | open, save | yes (PDF-compatible + editing-data structure, File Info) | PDF-compatible, or legacy version 7 (layers and groups) | see above; no real-file corpus |
| PDF | open, place, save | yes (layers, masks, editable text, security, overprint, File Info from the XMP packet and the document information dictionary; Crop To › Trim takes the bleed box as the document's bleed) | yes (presets, PDF/X-1a/3/4, layers, marks and bleed, ICC, fast web view, 1.3+) | fuzzed import; shared guarded writer and windowed reader ([pdf-backend.md](pdf-backend.md)), metadata, incomplete-content and dependency-source regressions; PDF text opens where the file draws it, glyph by glyph (#722: kerning or none, spacing per character, text rise as baseline shift, vertical writing, justified text boxes); alpha soft masks drawn as images import with the mask (#1551); a clip only counts as covering the page when its shape does (#1542); a PDF another app copied pastes as editable vector art (#1499); letter-spaced type on a path keeps its length and its glyph-by-glyph stroke comes in as one text object (#1586, #1585); a crafted name tree with shared nodes no longer takes exponential time on open (#1781); fonts named with hyphens (`Noto-Sans-Bold`) or with a composite font's CMap (`Name-Identity-H`) find the installed family; invisible text (rendering mode 3: a scanned page's recognized text) opens as type with no fill or stroke and saves back as invisible, searchable text (#2675); PDF/X-1a and X-3 flattening in a CMYK document keeps CMYK inks where it rasterizes (#2160) |
@@ -131,6 +131,7 @@ the app's own editing copy of a file (an EPS after its `%%EOF`, a `.ai`'s `AIPri
| Date | Change | Summary |
|---|---|---|
| 2026-11-01 | minor | Native format: a symbol's Symbol Type (`dynamic`) and a dynamic symbol instance's appearance changes to objects of its art (`symbol_overrides`) round-trip; both are left out when unset, so other documents save unchanged (#4938). `.ai` reading and writing of dynamic symbols remains. |
| 2026-11-01 | minor | Exports draw each artboard's background color behind its art (#4937): PNG, JPEG, GIF, TIFF, WebP, BMP, Targa and PSD (a layer of its own; on a transparent background too), PDF, SVG and EPS pages, a `.ai` file's PDF pages and PostScript and PDF print; `includeArtboardFill: false` leaves it out. Files with editing data (Preserve Editing, `.ai`, EPS, native) keep it as the artboard's color and reopen without extra art. Not read from the reference app's own `.ai` data, nor written to it. DXF, EMF and WMF leave it out |
| 2026-10-31 | minor | PDF import finds an installed font whose PDF name holds hyphens (`Noto-Sans-Bold` is Noto Sans, Bold: the longest part before a hyphen that names an installed family) and a composite font by its CIDFont's name rather than its base name, which ends in the CMap's (`Name-Identity-H`, [ISO 32000-1 §9.7.6.1](https://opensource.adobe.com/dc-acrobat-sdk-docs/pdfstandards/PDF32000_2008.pdf)); a missing font is split only before a style part (`Helvetica-BoldOblique`), so it is reported as `MS PGothic`, not `MS`; scores unchanged (estimated) |
| 2026-10-31 | minor | DXF export (2000–2018): the LAYOUT objects wrote the paper image origin as a point at group codes 148 and 158, but PLOTSETTINGS defines 148 and 149 and no 158, so strict readers could reject the file (Autodesk Fusion reported "DXF File failed to insert", #3085). They now write 148/149, the shade plot mode, resolution and DPI (76–78, 2004 and later) and flag 1024 on the Model layout; the plot style ACDBPLACEHOLDER no longer carries a subclass marker. Test `r2000_and_later_files_have_the_structure_cad_apps_require` (required sections and table entries, handles and references, LAYOUT group codes); exports pass ezdxf's recover and audit; not tested in Fusion itself; scores unchanged |