True if any visible actor sits on a track ABOVE this overlay's row (i.e. with a smaller track index). When that is the case, the overlay must be drawn

Keyframe times that matter for one scalar field (timeline diamonds, curve editor points). Omits `layout[0]` unless it starts a change segment or is th

Same visual treatment as [`param_label`] but takes a runtime `&str` the caller has already translated. Used by the audio inspector helpers, where labe

Paste every item in [`Self::clipboard`] into the scene. Each pasted item lands on a brand-new layer at the TOP of the layer stack so it doesn't overwr

Pause every sink without dropping it (so resume picks up where it left off).

Pick at most one image / video overlay per track for the preview. Mirrors `pick_actors_for_canvas` for overlays so two clips that share a lane don't r

Place a finished clip download according to its original drop target. Shared between the immediate path and the deferred queue retry.

Poll for completed background pre-load and apply results.

Poll for completed background *processed* pre-load and apply results into the processed ring buffer. Stale results (params_hash mismatch) are silently

Stamp every actor / overlay's `z_order` field on the supplied scene from the editor's timeline-track assignments. Must be called on the cloned scene r

Return `true` when `path` is confirmed to contain at least one audio stream, OR when the probe couldn't run (ffprobe missing / permission denied / fil

Probe a media file and return its duration in seconds when ffprobe succeeds.

Whether the background chroma/effects pipeline has produced at least one frame. While false, callers should keep showing the library thumbnail instead

Color for each property curve.

Value range for each property (min, max).

Insert a freshly decoded image into the L1 layer and run LRU eviction if we're over budget.

Rasterise `txt` against an `output_w × output_h` canvas. Returns `Ok(None)` when the text body is empty — callers should skip the overlay entirely in

Rasterise `txt` at an additional uniform pixel-density multiplier. The returned anchor and dimensions are expressed in the enlarged PNG's pixel space

Get the raw ColorImage for a given time (for post-processing like chroma-key). Same logic as frame_at_time but returns the image, not the texture.

Re-run checkerboard removal on an already placed web-search image.

Redo: restore the next state. Returns the restored snapshot.

Animated-param ids on the render frame, ordered for stable on- screen rendering. Returns `None` when the render frame is NOT the current selection — t

Bilinear single-channel resize for the predicted mask.

Bilinear RGB resize. Avoids pulling a heavier dep just for one call and matches the style of `resize_rgb` in `pose.rs` (but with proper bilinear inste

Build the extract subset and whether to capture the full frame. The timeline toolbar button is contextual: any selected actor / overlay becomes a sel

Replace `self.scene` and the lane assignment maps with the contents of an UndoSnapshot. Wrapper around the per-field reassignment so undo / redo flows

Convert an `[r, g, b]` triple in 0..=255 to HSV with H in [0, 360), S in [0, 1], V in [0, 1].

True when RMB selection-frame gesture is active (blocks canvas pan).

Asset root currently associated with the store. Returns an empty path before the first call to [`Self::index_dir`].

Sample one animated scalar field at `t` (per-parameter track).

Sample a `Vec<Keyframe<f32>>` track at time `t`, falling back to `default` for empty tracks. Used by the audio curve editor.

Returns the per-pixel alpha keep factor (0..1) for `(u, v)` in UV coords. Honours `feather` (UV-space soft edge) and `invert`.

Get interpolated state of a point at time `t`.

Save timeline layout state (zoom, scroll, track heights) to a JSON file.

Coalesce rapid `reload_library` requests from background workers so metadata sync does not stall the UI thread every few clips.

Animated-param ids on the layer that owns a track, ordered for stable on-screen rendering. Returns empty when no animatable layer is selected on the g

Walk the selected layer's effect stack and collect a `MaskParamRow` for every animated parameter on every `Mask` / `ColorKey` entry. Returns `None` wh

Animated-param ids for a single selection candidate when it lives on `track_idx`. Splitting this out makes the multi-select fallback readable.

Compute the on-canvas screen rectangle that the skeleton points are projected through. Mirrors the per-element projection used by the renderer for `Sk

Compute a stable slot id for a tab. `path = Some(...)` → deterministic hash of the canonical path, so the same project always reuses the same slot ac

Path to the sidecar metadata for a given slot id.

Pixel-aware snap window on screen — wide enough to "stick" to neighbouring clip edges without feeling mushy.

Snap a time value to the closest target if within threshold. Returns the target only when an actual snap candidate exists.

Download one image to `dest_dir` and report the result back via `tx`. `request_id` and `image_url` are echoed back unchanged in the `WebImageDownload

Split the actor at index `i` at scene-time `t`. Returns `Some((right_idx, right_id))` so the caller can re-parent any audio that was bound to this act