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Export: record slide resolution in PNG and JPEG pictures

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A default export is 2 pixels per point. Without a resolution, Preview
treats those pixels as 72 dpi and the picture opens at twice the slide's
size. PNG pHYs and JPEG JFIF density now say scale times 72, so the
default is 144 dpi. Screenshots stay untagged.

Co-authored-by: Cursor <cursoragent@cursor.com>
This commit is contained in:
Nikita Rakitin
2026-10-14 05:35:37 +03:00
co-authored by Cursor
parent 457406a7a5
commit d04df05249
11 changed files with 208 additions and 18 deletions
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docs/file-format-parity.md
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@@ -1,6 +1,6 @@
# File-format parity with PowerPoint
> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** trivial (Groups with a small legacy child coordinate space draw outlines, dashes, arrowheads and ink at their own width (#233); previously 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)
> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (a PNG or JPEG slide export records its resolution, so the default 2× picture is 144 dpi; previous: groups with a small legacy child coordinate space draw outlines at their own width, #233) · **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](gaps.md#file-formats). Dimension score: **~58% ready**
@@ -26,7 +26,7 @@ PowerPoint opens and saves; Viewer = opens only).
| `.deckcraft` native (zip + JSON) | n/a | yes (also `.slidecraft`) | yes | Lossless for the DeckCraft model, forward compatible | `crates/format` tests |
| PDF | 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 |
| PNG / JPEG slide images | export | n/a | yes (`file.export`, `deckcraft-cli render`) | Matches the editor's renderer. PNG `pHYs` and JPEG JFIF density are `scale` × 72 dpi (default scale 2 is 144 dpi), so Preview shows the slide's real size | render and engine 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 | no | | none |
| MP4 / MOV video of the deck | export | n/a | no | Needs timeline render + H.264 encode | none |
@@ -99,6 +99,7 @@ the round trip even though DeckCraft doesn't model it.
| Date | Change | Summary |
|---|---|---|
| 2026-10-14 | minor | PNG and JPEG slide export record their resolution (`scale` × 72 dpi; the default 2× picture is 144 dpi) |
| 2026-10-12 | minor | EMF/WMF text and pattern brushes drawn; OLE (VML) and ActiveX previews read |
| 2026-10-12 | minor | Text warps rendered; their adjust values read and written |
| 2026-10-12 | trivial | Groups with a small legacy child coordinate space draw outlines, dashes, arrowheads and ink at their own width (#233) |
docs/hardware-parity.md
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# Hardware parity with PowerPoint
> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (IME input, #101; previous: major, created from the renderer, media and windowing code) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365); PowerPoint for Windows where noted
> **Last reviewed:** 2026-10-14 · **Last updated:** 2026-10-14 · **Change:** minor (PNG and JPEG slide export record 144 dpi at the default 2 pixels per point; previous: IME input, #101) · **Target:** Microsoft PowerPoint for Mac 16.113 (Microsoft 365); PowerPoint for Windows where noted
What hardware PowerPoint uses and what DeckCraft uses, per platform. Dimension score: **~40%
ready** (estimated), **25–45 h** to parity. Performance (unmeasured, ~55%) is tracked here too
@@ -14,6 +14,7 @@ because it mostly follows from hardware use.
| Slide rasterization | GPU | **CPU** (`vello_cpu`) | CPU | CPU | CPU (wasm) |
| Transitions and Morph frames | GPU | CPU-rendered slide images composited as textured quads on the GPU | same | same | same |
| High-DPI / Retina | yes | yes | yes | yes | yes |
| Picture export resolution | 2 px per point, tagged so the file is the slide's size | PNG `pHYs` and JPEG density, 144 dpi at the default 2 px per point | same | same | same |
| Wide gamut / HDR display | partly (P3 images) | no (sRGB) | no | no | no |
| Startup on all GPUs | yes | yes | **no**: crashes in some Intel/AMD drivers (#40, #59) | not reported | n/a |
| Software fallback when no GPU | yes (WARP on Windows) | no | no | no | no |
@@ -71,5 +72,6 @@ outlines every frame (#67, fix open), and the decoders run in software.
| Date | Change | Summary |
|---|---|---|
| 2026-10-14 | minor | PNG and JPEG slide export record 144 dpi at the default 2 pixels per point, so a Retina picture opens at the slide's size |
| 2026-10-12 | minor | IME input methods (#101) |
| 2026-10-10 | major | Created: rendering, media, displays, input and performance against PowerPoint 16.113 |