Apply the effect stack in `effects` to an RGBA8 buffer in place. `(w, h)` are the image dimensions in pixels. Returns the resulting Crop inset (`left

Apply the full effect stack to an `RgbaImage` layer in-place. This is the render-time equivalent of the preview's `apply_effect_stack_cpu` — it runs e

Apply a parent transform to a child's local offset (world pixels).

When the user drags one of several multi-selected clips, the rest must follow by the SAME scene-time delta so the whole group moves as a rigid body. T

Build the modifier offset expressions in clip-local time `t - t_in`. Mirrors `memstroy_core::keyframe::evaluate_modifiers` exactly so the export trac

Build (but do not run) an FFmpeg plan for the given scene + output path. Resolves all relative asset paths against `assets_root`.

Remove the session; when `remove_overlay` is true also delete any image placed inside the selection frame.

Render-only: draw selection border, corner handles, and render-frame center handle. Does NOT consume any input.

Build the ffmpeg filter chain for a single `Effect`, honouring per-parameter keyframe animation (`Effect.param_kfs` + `animated_params`). When the ef

Clear the active drag-undo group. The next `mutate_drag` call (regardless of token) will push a fresh undo snapshot.

Hash the chroma-key + color-correction parameters with sub-millisecond precision. Two equal parameter sets yield the same hash so the processed textur

Insert a new video track at index 0 (top). Returns 0. Every existing assignment is shifted up by one so it keeps referring to the same row.

Modifier-stack inspector. Shows each modifier as an editable card with its parameters and an "x" remove button. The "+ Add" menu adds a new modifier o

Load settings from disk. Returns `Default::default()` on any failure (no file, malformed JSON, etc.) so the editor always starts with a valid settings

Maximum scene-time out-edge for a non-looping media item. Timeline duration consumes source duration at `speed`, so a 2x clip can only occupy half as

Read-ahead bookkeeping after a frame is shown.

Time used to read/write keyframes on overlays. Overlays are sampled in clip-local seconds (`t - t_in`) by `draw_canvas_overlays` and the renderer, so

True when a floating window, modal, or other foreground UI occupies `pos`, so the timeline must not steal pointer input from it.

Build piecewise-linear FFmpeg expressions for x/y position (in pixels) and scale (multiplier). Returns `(x_expr, y_expr, scale_x_expr, scale_y_expr)`.

Rename tracks from their current screen order. Top video row is V1; top audio row is A1. This prevents duplicate layer labels after deleting and recre

Strip a trailing `_copy[<digits>]` so repeated copy-paste cycles don't grow ids like `foo_copy_copy_copy`.

Convert time to X pixel position. Returns None if off-screen.

Insert a keyframe at `t`, replacing any existing keyframe within `epsilon`. Returns the index of the (possibly replaced or inserted) entry. Sorts the

Map a world-pixel position to output-pixel coordinates inside the render frame (top-left = (0,0), bottom-right = (rw, rh)). Honours the render frame's

World → output mapping. Mirrors `frame_snapshot::world_to_output`.

Apply a new world-pixel centre to an arbitrary selection. Same semantics as [`set_selection_world_center`] but takes the target element AND the undo t

Pick the right alpha-multiplier filter for an element transform. Returns `Some(filter)` only when an alpha multiplication is actually needed: Animat

Apply a victim trim (left edge, right edge, or both) to the scene. Mutates the scene in place inside a `mutate_drag` block keyed on `token` so the ope

Resolve the `Vec<Keyframe<f32>>` track for one audio param. Returns `None` for unknown ids so callers can transparently skip the rendering / mutation

Upsert one scalar field on the canvas layout track.

Directory that holds every per-project autosave slot.

Standard `over` alpha compositing (premultiplied output).

Build the full overlay-time transform for an element identified by `element_id`. This is the renderer's equivalent of `canvas_preview::get_element_wor

Cheap "did the asset dirs change?" detector. For each library directory we walk the *direct* contents (no subdirectories beyond `clips_dir/thumbs/`, w

Counts grouped by kind, sorted by [`AssetKind::ALL`] order.

Best direct CDN URL suitable for `reqwest` download (skips stream/blob). Prefers URLs that explicitly carry a video file extension (`.mp4`, `.mov`, `

Pull direct CDN links from raw HTML (list page or `?single` embed).

Filter and paginate the index. Search first matches exact substrings, then falls back to typo-tolerant Levenshtein scoring over id, label, description

Resolve `family` (e.g. "DejaVuSans") to a TTF path, optionally preferring a bold variant. Returns `None` when nothing matched.

Mellstroy library entry for a clip path, when known.

Uncropped world-pixel size of an image overlay (before Crop insets).

Animatable param row for a `ColorCorrection` scalar field. Mirrors `inspector_effect_anim_slider` but writes into the CC struct's own `kfs` / `animate

Inspector for the per-element effect stack. Effects are evaluated top-down on top of chroma key and colour correction; the user can reorder them with

Whether a tone curve is the identity `(0,0)–(1,1)` line. Mirrors the private check in `memstroy_core::scene` so we can skip emitting a `curves=` filte