From 32438ce25f69de99d2523b98237f62cfa90890d7 Mon Sep 17 00:00:00 2001
From: cashmere <cashmere@autistici.org>
Date: Tue, 28 Jul 2026 20:14:51 +0200
Subject: feat: port domain crates to Rust (session 1 complete)

All green: cargo test --workspace (~300 tests, 0 failures).
- timeline (45): placement, resize/ripple, split, snap, retime,
  audio separation, scene helpers
- animation (73): bezier solver, channel sampling, keyframe ops,
  split/clamp/clone, param definitions
- commands (9): Command trait, BatchCommand, history, 19 concrete
  commands, freeze-frame port 1:1
- audio (22): audible collection, range mixing, mastering limiter,
  rms/peak buckets
- text (19): cosmic-text layout/measure/raster, backgrounds,
  decorations
- graphics (52): full CSS gradient parser, tiny-skia raster,
  4 shape definitions
- effect-defs (16): blur definition, registry, pass resolution
- mask-defs (19): all 9 mask renderers via tiny-skia
- renderer (6): node model + scene builder port
- desktop: GPUI projects screen wired to ProjectStore
- scene: factory (web defaults: v32, Main Track, 1920x1080, 30fps)
---
 rust/crates/timeline/src/placement/apply.rs | 14 ++------------
 rust/crates/timeline/src/placement/mod.rs   |  8 ++------
 2 files changed, 4 insertions(+), 18 deletions(-)

(limited to 'rust/crates/timeline/src')

diff --git a/rust/crates/timeline/src/placement/apply.rs b/rust/crates/timeline/src/placement/apply.rs
index 4e044a68..56c3fd0a 100644
--- a/rust/crates/timeline/src/placement/apply.rs
+++ b/rust/crates/timeline/src/placement/apply.rs
@@ -46,8 +46,8 @@ pub fn apply_placement(params: &ApplyPlacementParams) -> Option<PlacementApplied
             let insert_index = params
                 .new_track_insert_index_override
                 .unwrap_or(*insert_index);
-            let new_track = build_empty_track(new_track_id.clone(), *track_type, None)
-                .with_elements(params.elements.clone());
+            let mut new_track = build_empty_track(new_track_id.clone(), *track_type, None);
+            *new_track.elements_mut() = params.elements.clone();
 
             let updated_tracks = if *track_type == TrackType::Audio {
                 SceneTracks {
@@ -89,13 +89,3 @@ fn insert_into_audio_tracks(tracks: &SceneTracks, insert_index: usize, track: Tr
     next
 }
 
-trait WithElements {
-    fn with_elements(self, elements: Vec<Element>) -> Self;
-}
-
-impl WithElements for Track {
-    fn with_elements(mut self, elements: Vec<Element>) -> Self {
-        *self.elements_mut() = elements;
-        self
-    }
-}
diff --git a/rust/crates/timeline/src/placement/mod.rs b/rust/crates/timeline/src/placement/mod.rs
index 8ad5710e..4eb2660e 100644
--- a/rust/crates/timeline/src/placement/mod.rs
+++ b/rust/crates/timeline/src/placement/mod.rs
@@ -1,4 +1,4 @@
-use scene::{Element, SceneTracks, Track};
+use scene::{SceneTracks, Track};
 use time::MediaTime;
 
 use crate::types::{ElementType, TrackType};
@@ -21,7 +21,7 @@ pub use insert_index::{
 };
 pub use main_track::{MAIN_TRACK_NAME, enforce_main_track_start, get_earliest_main_track_element};
 pub use overlap::can_place_time_spans_on_track;
-pub use resolve::resolve_track_placement;
+pub use resolve::{ResolveTrackPlacementParams, resolve_track_placement};
 pub use track_factory::build_empty_track;
 
 #[derive(Clone, Debug, PartialEq)]
@@ -98,7 +98,3 @@ pub fn ordered_tracks(tracks: &SceneTracks) -> Vec<&Track> {
         .chain(tracks.audio.iter())
         .collect()
 }
-
-pub fn track_elements(track: &Track) -> &[Element] {
-    track.elements()
-}
-- 
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