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Pictures: WMF and EMF draw, with the metafile reader ported from WordCraft (#317)

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Co-authored-by: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
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Brandon Thomas
2026-10-12 18:27:19 -04:00
committed by GitHub
co-authored by Claude Opus 5.5
parent a293b68258
commit f8d54d7af4
21 changed files with 3173 additions and 14 deletions
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docs/gaps.md
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@@ -20,7 +20,7 @@ revision history.
| 1 | PPTX never tested against a corpus of real decks | File format | B | 20–35 | [file-format-parity.md](file-format-parity.md) |
| 2 | Data loss and crashes on common paths (#60, #40, #59) | Stability | B | 6–12 | this file |
| 3 | PPTX round trip drops comment threads, media options, rewind (#70, #74, #77) | File format | B | 3–6 | [file-format-parity.md](file-format-parity.md) |
| 4 | EMF/WMF and SVG pictures don't render | File format | B | 8–14 | [file-format-parity.md](file-format-parity.md) |
| 4 | SVG pictures don't render (EMF/WMF do) | File format | B | 8–14 | [file-format-parity.md](file-format-parity.md) |
| 5 | No localization: English only | Localization | B (infra + 5 languages) | 55–90 | [localization-parity.md](localization-parity.md) |
| 6 | No printing | Feature | B | 5–8 | [file-format-parity.md](file-format-parity.md) |
| 7 | Fonts: only Regular, Bold and Italic faces (#69) | Feature | B | 3–5 | [ui-parity.md](ui-parity.md) |
@@ -75,14 +75,14 @@ Detail in [file-format-parity.md](file-format-parity.md).
- **Impact:** a deck opened and saved silently loses review state and show behaviour.
- **Estimate:** 3–6 h. **Beta blocker.**
### EMF/WMF and SVG pictures don't render
### SVG pictures don't render
- **Evidence:** `crates/render/src/images.rs` decodes through `image` 0.25 (PNG, JPEG, WebP, GIF,
TIFF, BMP); nothing reads EMF, WMF or SVG. Decks from Windows often hold EMF (pasted charts,
Visio, logos); PowerPoint's Insert Icons stores SVG with a PNG fallback.
- **Impact:** blank pictures in real decks; SVG icons show only their raster fallback, and SVG files
can't be inserted.
- **Estimate:** 8–14 h (an SVG renderer through `resvg`-style crates, an EMF/WMF record player for
the common records). **Beta blocker** for EMF.
TIFF, BMP), and EMF/WMF through `deckcraft-metafile` (ported from WordCraft: paths, fills, pens
and bitmaps; text records are skipped). Nothing reads SVG; PowerPoint's Insert Icons stores SVG
with a PNG fallback.
- **Impact:** SVG icons show only their raster fallback, and SVG files can't be inserted. Text
drawn inside an EMF/WMF is missing.
- **Estimate:** 4–8 h (an SVG renderer through `resvg`-style crates); EMF text records 2–4 h.
### Template, slide-show and macro variants are saved as plain `.pptx`
- **Evidence:** `crates/pptx/src/write/mod.rs` always writes the