Check if a frame index is within the current ring buffer range.

Render a generic LibraryAsset list (sounds / images / particles / videos). All four share the same row layout — only the title colour and the drop sem

Per-param keyframe strip for the render frame inspector. REMOVED: the render-frame keyframe strips moved out of the inspector and onto the dedicated "

Place the named point at normalised (nx, ny) at the given clip-local time. Inserts a new keyframe (or updates the closest existing one within ~1 frame

Drop `canvas_layouts` rows that no longer match a live element id.

Mark every audio track bound to the actor as deleted (instead of removing from the array to prevent index shifts). Also marks the actor's embedded aud

Vertical pixels needed for the render-frame row's per-param keyframe strip, mirroring `selected_layer_expansion` for regular tracks. Returns 0 when th

Anti-aliased coverage of point `(fx, fy)` against the rounded rectangle defined by top-left `(rx, ry)`, size `(rw, rh)` and uniform corner radius `r`.

Sample a single named scalar CC parameter at clip-local time `t_local`. When `key` is in `animated_params` AND `kfs[key]` is non-empty, the eased keyf

Build a scalar track for one field. A single keyframe ⇒ constant value.

Scan a directory for assets of the given category and turn each supported file into a `LibraryAsset` row. Used by `reload_library` so the user can dro

Axis-aligned bounding rect of the selected element (for legacy callers).

Extra height to add to a track row so the per-param keyframe rows of the currently-selected layer fit underneath the clip bar.

Update the globally-active language. Call this once at startup (after loading settings) and whenever the user changes the language in the settings dia

Split the audio track at index `i` at scene-time `t`. When `right_parent` is `Some`, that string overrides the right half's `parent_actor`; otherwise

Trigger a background thread to pre-load frames starting at `start_frame`.

Find or insert (within ε) the index of a keyframe at time `t`. Seeds a freshly inserted keyframe with `seed_value` and easing `Linear`. Returns the in

Directory holding user-imported videos. Drops onto the Videos tab from the OS file manager copy here; drags from the tab spawn actor clips on the canv

Whether the active tab differs from its last-saved baseline.

Compute the screen-space rectangle of an actor on the canvas, replicating the math in `draw_canvas_elements`. Returns `None` when the actor has no usa

Resolve the timeline track index for a given actor (defaulting to the first video track).

Add an actor from a clip dropped onto the free canvas. Inserts an entry in `canvas_layouts` so the clip is centred at the supplied world position imme

Add an actor from a clip at a specific time (used by drag-to-track). Returns the new actor index, or `None` when the file is not ready.

element so the caller can push it into the selection. Used by the Ctrl+V system-clipboard handler — pasting an image from the OS turns into "image now

Apply a per-state opacity factor to a base color.

Apply the active drag mode using the current pointer position.

Walk `effects` and apply them on top of `current` (a labelled stream). Non-mask effects are buffered into a single comma chunk for compactness; each `

Public dispatcher: selects the SIMD path on x86_64 / aarch64 when the frame is wide enough to amortise the setup cost, otherwise falls back to the sca

Apply a victim split. The original clip becomes the LEFT half (ends at `m_in`); a clone becomes the RIGHT half (starts at `m_out`) and is inserted at

Write one scalar parameter at `t` without disturbing other animated fields (curve editor "+ Key", drag, double-click).

Apply the same total world translation to every snapshot entry that is NOT the primary selection. Re-uses the primary's undo token so the whole compou

HTTP client used by the scraper. Configured for resilient long crawls (gzip, sane timeouts, browser-like UA).

Compact circular rotation dial. The pointer angle relative to the dial centre is mapped directly to `*deg` so the user always lands on the exact value

Non-blocking duration: use cache, else spawn ffprobe in the background.

Visible duration of the clip in clip-local seconds.

Map a scene-time playhead into clip-local seconds (the time base used by `SkeletonTemplate` keyframes).

Collect every snap-eligible scene-time on the timeline: every clip edge except the dragged clip's own, plus timeline markers such as the playhead and

DaVinci-style colour wheel: - 2D pad whose XY position maps to per-RGB channel deltas through a hexagonal RGB layout (R at 0°, G at 120°, B at 240°).

Helper: commit the in-flight polygon via `commit_mask_draft`, then reset the carrier + draft.

Mirror of `canvas_preview::default_overlay_track` — picks the second video lane when one exists, else the first, else 0.

Download a preview JPEG/PNG/WebP from the assets server. Thumbnails are often well under 4KB (ffmpeg uses `scale=160:-1`), so they must not go through

Quick predicate used by emitters to decide whether the element's effect stack contains any [`EffectKind::Mask`] entries that are actually live (enable

Re-sort `tracks` so all `Video` lanes come before all `Audio` lanes (video on top, audio at the bottom of the layers panel). The order inside each kin

Extract a single PNG frame at `time_secs` from `path` via ffmpeg and return it as raw RGBA8 bytes. Returns `None` on any failure — caller folds that i

Crawl a public channel from the most recent post to the very first, following `prev` pagination via `?before=`. Returns posts ordered by id ascending

Find the index of the audio track bound to a given actor id, if any.