Felix RiestraandClaude Sonnet 5
79028bcee4
The ad-hoc codesign path signed the whole bundle with one --deep pass, which never carried --entitlements to the QuickLook appex, so PlugInKit silently rejected it as unsandboxed. Sign nested code individually instead, matching the Developer ID path. Separately, ThumbnailProvider drew the extracted preview at its native pixel size anchored at the CGContext origin (bottom-left) instead of scaling it to fill request.maximumSize, producing a small thumbnail stuck in one corner instead of a properly sized, centered icon. Note: Gatekeeper still rejects an ad-hoc or unnotarized Developer-ID signature outright, and PlugInKit periodically re-validates and drops any registered plugin that fails that check — so these fixes are necessary but not sufficient for thumbnails to render from a build that isn't both signed and notarized. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
DWG thumbnails for OS file managers
dwg_thumbnailer::extract reads only the embedded preview from a DWG (file
header → preview seeker → parse — never the whole drawing) and returns it as an
image::RgbaImage. It's the shared core behind every platform's thumbnail
integration.
crates/
dwg-thumbnailer/ this crate — shared core + macOS extension sources
dwg-thumbnailer-win/ Windows IThumbnailProvider COM DLL (depends on the core)
Linux (COSMIC, GNOME, Nautilus, Nemo, …) — handled by OpenCADStudio itself
No separate binary. OpenCADStudio embeds this core and, on startup, installs a
freedesktop .thumbnailer pointing at its own hidden --dwg-thumbnail mode
(see src/io/file_association.rs::install_thumbnailer). Launch OCS once and file
managers render DWG thumbnails; clear stale "no thumbnail" cache if needed:
rm -f ~/.cache/thumbnails/fail/*/*.png
Windows (Explorer) — authored, build & test on Windows
A COM in-proc server implementing IThumbnailProvider. Not compiled/tested on
the Linux dev host — build and verify on Windows.
cd crates\dwg-thumbnailer-win && cargo build --release
regsvr32 target\release\dwg_thumbnailer_win.dll :: register (elevated)
regsvr32 /u target\release\dwg_thumbnailer_win.dll :: unregister
ie4uinit.exe -show :: refresh thumbnails
If regsvr32's self-registration needs adjusting, the equivalent registry keys
are (replace the path):
Windows Registry Editor Version 5.00
[HKEY_CLASSES_ROOT\CLSID\{8F2A9C41-3B6E-4E2D-9C7A-1E0B5D6F42AA}]
@="OpenCADStudio DWG Thumbnail Provider"
[HKEY_CLASSES_ROOT\CLSID\{8F2A9C41-3B6E-4E2D-9C7A-1E0B5D6F42AA}\InprocServer32]
@="C:\\path\\to\\dwg_thumbnailer_win.dll"
"ThreadingModel"="Apartment"
[HKEY_CLASSES_ROOT\.dwg\ShellEx\{e357fccd-a995-4576-b01f-234630154e96}]
@="{8F2A9C41-3B6E-4E2D-9C7A-1E0B5D6F42AA}"
macOS (Finder) — sources provided, build in Xcode
A QuickLook Thumbnail Extension (macos/ThumbnailProvider.swift) calls the
Rust core's C ABI, linked as a static library. Requires Xcode + a host app.
- Build the core as a static lib for your arch(s):
cargo build -p dwg-thumbnailer --release --target aarch64-apple-darwin # → target/aarch64-apple-darwin/release/libdwg_thumbnailer.a - In Xcode, add a Thumbnail Extension target to a host app.
- Use
macos/Info.plist(lists thecom.autodesk.dwgUTI). - Add
macos/ThumbnailProvider.swift. - Add a bridging header that
#includesmacos/dwg_thumbnailer.h. - Link
libdwg_thumbnailer.a(+ system frameworks it needs).
- Use
- Sign, install the host app, and Finder picks up the extension.
C ABI (see dwg_thumbnailer.h):
dwg_thumbnail_png(path, max_dim, &ptr, &len) / dwg_thumbnail_free(ptr, len).
Formats: DWG BMP-DIB and PNG embedded previews decode. WMF previews and files without a preview (or DXF) produce no thumbnail — the file manager falls back.