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LRC-SS-LAYOUT: slideshow layout, options and backdrop: slides composed with margins, stroke, shadow and backdrop

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- New crate lightcraft-slideshow (L1, no UI): SlideSettings (margins linked or
  independent, guides, aspect preview, zoom to fill, stroke border, cast shadow,
  backdrop colour, colour wash, background image; lengths relative to the slide's
  shorter side; validated and clamped) and a CPU compose() used by playback, the
  Settings preview and slideshow.preview.
- Engine: slideshow.layout (partial merge, saved in prefs.json) and
  slideshow.preview {id?, width?, height?, path?} (PNG to path or base64);
  RenderJob::with_slide composes on the render worker; the background photo is
  rendered once and shared.
- Playback: with a non-default layout each slide is the composed screen-sized
  slide, prepared ahead like before; the default layout plays as before.
- Settings > Slideshow: Layout, Options and Backdrop sections and a debounced
  live preview of the active photo's slide (with margin guides).
- Tests: composer geometry/pixels/hostile input, command get/set/persist/preview,
  headless playback of a composed slide and of the default layout.
This commit is contained in:
Jason Baldwin
2026-10-10 21:47:42 +02:00
parent 52875ec3f9
commit ae033aaf32
36 changed files with 2094 additions and 36 deletions
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docs/control-protocol.md
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@@ -49,6 +49,8 @@ mode ([mcp.md](mcp.md)) is a thin layer over this channel. Implementation:
| `engine.execute {command: "activity.list"}` | — | The long-running tasks in flight (imports, exports, preview builds, downloads, the face scan…), oldest first: `{tasks: [{id, kind, label, done, total, unit, detail, cancellable, cancelling, ageMs}]}`; `total` 0 = not known yet; `unit` is `count`, `bytes` or `percent`; `label` is English (the app shows it translated) |
| `engine.execute {command: "activity.cancel"}` | `{id}` or `{all: true}` | Asks the task (or every cancellable one) to stop at its next file or photo → `{cancelled: n}`; an unknown id (it may have just finished) or a task that can't be cancelled is an error |
| `ui.render` | `{id?, size?, path?}` | Render a photo (PNG to `path`), `{width, height}` |
| `engine.execute {command: "slideshow.layout"}` | `{margins?, marginLeft?, …, zoomToFill?, strokeBorder?, castShadow?, backdropColor?, colorWash?, backgroundImage?, …}` (see `engine.commands`) | The slideshow's slide layout (Layout, Options, Backdrop), saved with the library; omitted keys keep their value, `{}` reads it; out-of-range numbers are clamped, a wrong type or unknown key is refused and nothing changes |
| `engine.execute {command: "slideshow.preview"}` | `{id?, width?, height?, path?}` | One slide composed with the layout, as the slideshow plays it: a PNG written to `path`, or returned base64 in `png` without one; `{id, width, height, cell, photo}` (`cell` and `photo` are `[x0, y0, x1, y1]` in slide pixels). Sides 16–4096; one side given takes the other from the aspect preview |
| `app.quit` | — | Close the app |
Image navigation is also available directly as the UI command `view.navigate`, with