After inserting the right-half actor next to the left half, trim both timeline tracks and split any shared `canvas_layouts` row.

Trim overlay halves after a razor split (clip windows + layout + modifiers).

Cover-fit an image overlay into a world-pixel selection rectangle.

Iterate every clip on the timeline (actors, overlays, audio, backgrounds, render frame) and call `f(selection, screen_rect)` when the clip has a visib

Look up a frame for the source at `path`, given a clip-local time `local_t`. Returns `None` only when the cache entry is missing or the clip is empty;

Get the texture for a given time `t` in seconds. Uses a ring buffer for O(1) access and reuses a single TextureHandle. Returns `None` if the cache is

Effect-stack parameter ids are encoded as `fx_<index>_<sub>` where `<sub>` is one of: intensity, p0, p1 (effect-specific). The inspector uses this con

For every `*.mp4` file in `clips_dir` without a matching `thumbs/<stem>.jpg`, run a quick ffmpeg pass to extract a frame.

For each video in `videos_dir` without a sibling `.thumb.jpg`, extract the first decoded frame for the library grid.

Sample the high-pass cutoff in Hz at clip-local time. Same disable-when-`None` rules as [`Self::low_pass_at`].

Insert a new audio track immediately after the last video track (i.e. at the top of the audio block). Returns the new track's index.

Shared masks UI used by the actor inspector tab and the per-overlay inspector column. Mutates the effects list in place: removes the trailing mask ent

Shared "transform" widget block for the three overlay flavours (Image / Video / Text). Reads sampled values from `layout` and only writes through `cra

Reset preview caches for any layer using `path` and queue ffmpeg warmup.

Inverse of [`apply_parent_transform`].

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

Kick a fresh search (when `append == false`) or fetch the next page (when `append == true`). The append path keeps the existing `results` and the cach

Nearest layout keyframe index for a param-change time.

Every asset directory the editor's library panel surfaces, in a fixed order so [`Self::library_dir_fingerprint`] stays comparable across rescans. Used

Load previously saved AnchorTrack.

Load a single frame from disk as a ColorImage.

Load a `.memstroy` bundle: returns the parsed Scene and applies the embedded layout to `self`. The caller is responsible for installing the scene into

Translate a key into this language. Returns the English source string when no Russian translation is registered.

Sample the low-pass cutoff in Hz at clip-local time. Returns `None` when the filter is disabled (`low_pass_hz == None`), otherwise the eased animated

True when the mask drawing pipeline should consume this pointer gesture instead of the default transform handler. Always returns `false` when no tool

Lightweight match: accepts the bound element's stored `skeleton_id` equal to the template name (canonical case) or to the host actor's id (legacy conv

Keep the canvas image-search session in sync after overlay rows are removed (Delete key, search-popup dismiss, …).

Stable ordering for the param rows so the visual layout doesn't shuffle as the user toggles params on/off.

Sample the stereo pan at clip-local time `t_local` (-1..=1).

Directory holding particle sprites.

Pick the lane a fresh audio clip with the given time range should land on: the first empty audio lane that fits, falling back to a freshly-inserted la

Variant of [`piecewise`] that lets the caller pick the time variable name embedded in the expression. The default `t` is what `overlay=`, `rotate=`, `

Sample the pitch shift in semitones at clip-local time `t_local`.

Place a newly added image overlay at a world-pixel point (PopupOnly RMB).

Start (or restart) playback from `playhead` mixing every source in `sources` whose timing window overlaps the future timeline. This call returns imme

Allow-list of file extensions that count as the *primary* asset of this kind. Anything else found in the kind's subdirectory is treated as a sidecar (

Probe the duration (in seconds) of the video at `path` via ffprobe. Returns `None` when ffprobe isn't on `PATH` or the probe fails.

Push an `AudioTrack` matching `actor` so the embedded audio shows up as its own row on the audio lanes. Returns the new index. The audio track is link

Drop the auto-seeded anchor at `t = 0` when the first real keyframe is authored elsewhere on the timeline.

Compute the four screen-space corners of the render frame (TL, TR, BR, BL). Applies the frame's `rotation_deg` around its centre.

Clear in-flight timeline / element-drag state after toolbar actions (e.g. "+ V Layer") so clip drags are not stuck behind `timeline_input_lock` or a s

Resolve to an absolute path; prefer canonical paths but fall back when the OS refuses (OneDrive placeholders, long paths, …).

Resolve a frame from the ring buffer, falling back to a synchronous disk read and back-filling the slot. Fixes holes when preload slots are `None` or

Resolve a `SkeletonAttachment` on an overlay to a WORLD position by finding the host actor and projecting the normalised point through the actor's cur

Sample the reverb mix at clip-local time (0..=1).

Sample an actor layout at time `t` with per-parameter tracks decoupled (opacity keyframes do not affect scale timing, etc.).

Helper: sample a SkeletonPoint at clip-local time t.

Sample the RenderFrame state with its animation modifiers layered on top — mirrors the additive treatment used for actors / overlays. Used for *displa

Save the active scene + editor layout to a `.memstroy` project file. The format is JSON with the shape: ```json { "format": "memstroy", "format_versi

Vertical space the mask-row strip needs above the clip on a track. Returns 0.0 when the selected layer has no animated mask params, so the existing la

Set the master volume (0.0 .. 1.0). Per-track volumes still apply.

Hash signature for an effect stack at a given time. Used as the cache key for the per-overlay processed-texture cache so we only re-run the pipeline w

Signed-distance-style margin: positive when the point is well inside the shape, 0 at the edge, negative outside. Returned in the SAME units as `u`, `v

Directory holding sound effects available in the library. Files dropped in here get picked up by the next `reload_library` call.

Sample the speed at clip-local time `t_local`. Same semantics as [`Self::volume_at`].

Start the HTTP server on the given address with the given asset store. The returned [`JoinHandle`] resolves when the server stops (either gracefully o

Start frame extraction for ALL actors in the scene.

Start waveform extraction for all audio tracks that don't yet have waveform data. Spawns background tasks (similar to frame extraction pattern) that c

Mirror an overlay's normalised layout position into `canvas_layouts` when the element was placed on the free canvas (world-pixel keyframes). Inspector

Load the active tab's scene into `self.scene`.