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Matúš LacoandClaude Opus 5.5
c871c5f634
There was no way to turn a presentation into an animated GIF. file.export now writes one: format
`gif` (or a .gif path), one frame per slide drawn by the slide renderer and shown for
secondsPerSlide, encoded with the `image` crate's GIF encoder (already a dependency, no new
crates) with a 256-colour palette per frame: exact when a slide has 256 colours or fewer,
NeuQuant otherwise. Slides are composited onto white.
Options: width (small 640, medium 960 (default), large 1280, extraLarge 1920, or 16-3840 px; the
height follows the slide's aspect ratio, no side over 3840), secondsPerSlide (0.1-600, default 5,
written in GIF hundredths), loop (forever by default, or once: no NETSCAPE2.0 block), slides (a
list of indices, in play order) and includeHidden (hidden slides are skipped by default).
Out-of-range or wrongly typed values, NaN and infinities are BadParams errors, never panics; at
most 500 frames and 200 million pixels in total, checked before anything is rendered.
- Engine: crates/engine/src/gif_export.rs (options, frame list, size, encoder);
cmd::file::gif_bytes, save_bytes("gif"), format_for_path(".gif").
- UI: the Export… dialog (Command palette; the app has no File menu yet) gets "Animated GIF (.gif)" with Size, Seconds per slide, From/To slide,
Loop forever and Include hidden slides; an invalid range or value keeps the dialog open with a
message. The web build downloads the bytes (image/gif).
- CLI: convert IN OUT.gif, run --export OUT.gif --export-params JSON; usage lists the format and
options.
- MCP: the export tool lists gif and width/secondsPerSlide/loop (slides and includeHidden now
apply to PDF and GIF).
- Docs: file-format parity GIF row, gaps (video export remains), parity checklist row M -> P
(P2 breadth 36% -> 37%, overall 79%), control protocol, MCP, README, ROADMAP progress log.
Transitions and build animations are not animated in the GIF (tracked with video export).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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File-format parity with PowerPoint
Last reviewed: 2026-10-10 · Last updated: 2026-10-11 · Change: minor (animated GIF export, #171; previous: major, created; formats taken from PowerPoint 16.113.4's Info.plist, PPTX coverage measured from
crates/pptx) · Target: Microsoft PowerPoint for Mac 16.113 (Microsoft 365)
Every format PowerPoint reads or writes, DeckCraft's support, fidelity and how it is tested. Gaps are itemized in gaps.md. Dimension score: ~58% ready (estimated), 60–110 h to parity.
Weights inside this dimension: PPTX 70%, PDF export 10%, image export 5%, legacy binary formats 5%, everything else (templates, shows, macros, ODP, video, GIF, outline) 10%.
Documents
From /Applications/Microsoft PowerPoint.app/Contents/Info.plist CFBundleDocumentTypes (Editor =
PowerPoint opens and saves; Viewer = opens only).
| Format | PowerPoint | DeckCraft read | DeckCraft write | Fidelity / notes | Tested by |
|---|---|---|---|---|---|
.pptx presentation |
Editor | yes | yes | Broad (see below); never measured on real decks | crates/pptx/tests/roundtrip.rs, sample.rs, malformed.rs, sniff.rs (30 tests); opened in PowerPoint by hand 2026-10-06 |
.potx template |
Editor | yes (as a presentation) | no: written with the .pptx content type |
file.saveTemplate is Save As under another name |
none |
.ppsx slide show |
Editor | yes (as a presentation) | no: written as .pptx content |
Doesn't start in show mode | none |
.pptm / .potm / .ppsm macro-enabled |
Editor | no | no | Should open and keep vbaProject.bin without running it |
none |
.ppt / .pot / .pps 97–2003 binary |
Editor | no | no | Owner decision; import only would be enough | none |
.odp OpenDocument |
Editor | no | no | none | |
.thmx Office theme |
Viewer | no | no | Browse for themes is a P2 row | none |
.deckcraft native (zip + JSON) |
n/a | yes (also .slidecraft) |
yes | Lossless for the DeckCraft model, forward compatible | crates/format tests |
| export | no | yes | Slides, notes pages, handouts (1–9); real-text layer with embedded subsets, links, bookmarks. Slide artwork is a raster image at print resolution, not vector | crates/pdf tests |
|
Outline .rtf / .txt |
export (RTF), import (outline) | .txt/.md outline (slide.fromOutline) |
.txt outline |
No RTF | engine tests |
| PNG / JPEG slide images | export | n/a | yes (file.export, deckcraft-cli render) |
Matches the editor's renderer | render tests |
| TIFF / BMP / GIF slide images | export | n/a | no | Easy (the image crate writes them) |
none |
| Animated GIF of the deck | export | n/a | yes (file.export format gif, Export…, deckcraft-cli, MCP export) |
One frame per slide from the slide renderer; size small/medium/large/extra large or 16–3840 px wide, 0.1–600 s per slide, loop forever or play once, slide range, hidden slides skipped; a 256-colour palette per frame (exact, or NeuQuant above 256 colours). Transitions and build animations are not animated | crates/engine/src/gif_export.rs tests (decoded frames, size, delay, loop, hidden slides, hostile params), MCP, CLI and export dialog tests |
| MP4 / MOV video of the deck | export | n/a | no | Needs timeline render + H.264 encode | none |
| yes | n/a | no | PR #66 (browser) open | none |
Pictures and media inside decks
| Kind | PowerPoint | DeckCraft | Notes |
|---|---|---|---|
| PNG, JPEG, GIF (animated), BMP, TIFF, WebP | yes | yes | image 0.25; animated GIFs play since #39 |
| SVG | yes (with PNG fallback) | no | The PNG fallback shows; SVG files can't be inserted |
| EMF / WMF | yes | no | Common in decks made on Windows: blank picture |
| HEIC | yes (macOS) | no | |
| Audio: MP3, AAC/M4A, ALAC, WAV, AIFF, CAF, FLAC, Ogg Vorbis, Opus | yes (Ogg/Opus partly) | yes | Pure-Rust decoders in crates/media, crates/opus |
| WMA | yes (Windows) | embedded, not playable | |
| Video: H.264, HEVC in MP4/MOV | yes | yes | Pure-Rust, software decode |
| Video: VP9, AV1 in WebM/MKV | partly (OS codecs) | yes | Ahead of PowerPoint for Mac |
| WMV | yes (Windows) | embedded, not playable | |
| Online video (YouTube embeds) | yes | no | Cloud feature |
| Embedded OLE objects | yes | kept on round trip (opaque), not insertable or editable | ShapeKind::Opaque |
3-D models (.glb) |
yes | no | |
| Embedded fonts | yes | no | p:embeddedFontLst ignored |
PPTX coverage (PresentationML / DrawingML)
What crates/pptx reads and writes, from ECMA-376. "Kept" means the XML is preserved untouched for
the round trip even though DeckCraft doesn't model it.
| Part / feature | Read | Write | Notes |
|---|---|---|---|
| OPC package, content types, relationships | yes | yes | Content types found anywhere in the zip (#19); zip bombs capped; relationship cycles bounded |
| Presentation, slide size, sections (p14), custom shows | yes | yes | |
| Slide masters, layouts, placeholders and inheritance | yes | yes | |
| Themes: colour, font (Latin/EA/CS), effect schemes, background styles | yes | yes | Unknown theme parts kept |
| Notes slides and notes master | yes | yes | No notes-master editing view |
| Handout master | no | no | |
| Shapes: preset geometry (~150 presets), custom geometry, groups, connectors | yes | yes | Presets re-derived in crates/geom/src/preset.rs |
| Fills: solid, gradient, picture (stretch/tile/crop), pattern, group | yes | yes | |
| Lines: dash, compound, caps, joins, arrowheads | yes | yes | |
| Effects: shadow, glow, soft edges, reflection | yes | yes | |
3-D: scene3d, sp3d |
kept | kept | Not rendered |
| Text: runs, paragraphs, bullets, numbering, levels, autofit, columns, vertical, RTL, script fonts, fields, hyperlinks | yes | yes | Round-trip tests incl. justLow and date fields |
Text warp (prstTxWarp) |
yes | yes | Not rendered |
| Pictures with crop, recolour, duotone, alpha, luminance | yes | yes | |
| Tables with styles | yes | yes | |
Charts (c:chartSpace) |
yes | yes | Original XML kept in Chart.raw |
Charts (cx: chartex: waterfall, funnel, treemap, sunburst, histogram, box) |
no | no | |
SmartArt (dgm) |
drawing part only, as a group | as shapes | Diagram data model lost on save |
Equations (OMML, a14:m) |
no | no | PR #55 open |
Audio / video (p14:media, trim, fades, bookmarks) |
yes | partly | Playback options lost on save (#74) |
Ink (contentPart) |
yes | as a group of freeform lines | PowerPoint sees shapes, not ink |
| Transitions incl. p14/p15 (Vortex, Morph…) | all 48 | all 48 | every_transition_kind_round_trips |
| Animations: timing tree, build paragraphs, triggers, motion paths | yes (flattened to the Animation Pane list) | yes (rebuilt) | every_animation_effect_survives; rewind lost (#77) |
| Comments: legacy | yes | yes | |
Comments: modern threaded (p188) |
yes | no (written as legacy) | Replies and resolved state lost (#70) |
Unknown slide-level elements (graphicFrame OLE, extensions, mc:AlternateContent) |
kept | kept | Rendered as a labelled placeholder with the preview picture when present |
| Tags, custom XML, VBA | no / no / no | ||
| Embedded fonts | no | no | |
| Encryption (password to open) | no | no |
What would move the PPTX number
- An owned corpus of real-world-shaped decks (corporate templates, SmartArt, chartex charts, EMF, embedded fonts, every transition and animation) in a corpus repo, with import → render → export → re-import checks in CI and a PowerPoint reference render for each (owner runs PowerPoint).
- The round-trip losses above (#70, #74, #77).
- EMF/WMF and SVG rendering.
Revision history
| Date | Change | Summary |
|---|---|---|
| 2026-10-11 | minor | Animated GIF of the deck: export yes (#171) |
| 2026-10-10 | major | Created from PowerPoint 16.113.4's CFBundleDocumentTypes, crates/pptx reader/writer and tests, and the open round-trip issues |