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feat(thumbnails): embed DWG previews and wire cross-platform file thumbnails

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Round-trip a raster preview through the DWG's embedded preview slot and
surface it to the OS file managers, so drawings show their contents in
Explorer / Finder / Nautilus instead of a generic document icon.

OCS:
* io::thumbnail — rasterize the scene to a BMP DIB on save (embedded via
  acadrust's new Preview type) and read it back on open for the Start
  page recent list; `--dwg-thumbnail IN OUT SIZE` CLI extracts a badged
  PNG for external thumbnailers.
* io::file_association::install_thumbnailer — self-install the OS
  integration on startup: Linux writes a .thumbnailer + hicolor mimetype
  icons; Windows registers the IThumbnailProvider DLL under HKCU.

Shared core:
* crates/dwg-thumbnailer — lean (image-only) preview extractor + the
  `badge_dwg` full-width "DWG" band, used by every platform so the
  ribbon is single-sourced. Ships an rlib+staticlib.
* crates/dwg-thumbnailer-win — IThumbnailProvider COM in-proc server
  (cfg(windows), CI-built as a workspace member).
* macos/ — QuickLook thumbnail extension (Swift + C-ABI bridge to the
  core staticlib), assembled into a .appex.

Icons & packaging (single SVG source -> per-platform assets in CI):
* assets/mimetypes/image-vnd.{dwg,dxf}.svg — themed file icons.
* packaging: WiX ships dwg/dxf.ico + the thumbnail DLL and points the
  ProgIds at them; Info.plist gets CFBundleTypeIconFile + the QuickLook
  extension in Contents/PlugIns.
* release.yml — generate .ico (Windows) and .icns (macOS) from the SVGs,
  build the QuickLook .appex, and bundle everything.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Hakan Seven 2026-07-11 01:27:17 +03:00
commit ba3b3202e8
20 changed files with 1085 additions and 76 deletions
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20
src/main.rs
View file

@ -51,6 +51,19 @@ fn main() -> iced::Result {
return Ok(());
}
// Thumbnail mode: the OS file-manager thumbnailer invokes us as
// `--dwg-thumbnail <in> <out> <size>`. Extract the DWG's embedded
// preview to a PNG and exit — never touch the GUI.
if let Some(a) = &args.dwg_thumbnail {
let size = a.get(2).and_then(|s| s.parse().ok()).unwrap_or(256);
let ok = io::thumbnail::extract_to_png(
std::path::Path::new(&a[0]),
std::path::Path::new(&a[1]),
size,
);
std::process::exit(if ok { 0 } else { 1 });
}
// Opt-in logging. `--log LEVEL` seeds RUST_LOG; the subscriber then
// surfaces wgpu / iced / winit diagnostics that are otherwise silent.
if let Some(level) = &args.log {
@ -110,6 +123,13 @@ fn main() -> iced::Result {
read_only: args.read_only,
script_lines,
});
// Register (or refresh) the freedesktop DWG thumbnailer so file managers
// show OCS-embedded previews. Idempotent, best-effort, no consent step —
// it only points a `.thumbnailer` at this same binary's `--dwg-thumbnail`
// mode. Silently ignored on failure or non-Linux.
io::file_association::install_thumbnailer();
app::run()
}
}