From 8db3bead13441a5882d8689dfc6a9f09c82375d9 Mon Sep 17 00:00:00 2001
From: Maze Winther <mazewinther@gmail.com>
Date: Wed, 25 Mar 2026 16:47:22 +0100
Subject: feat: masks, properties refactor, shaders, storage migrations, and
 more

---
 .../lib/commands/timeline/element/retime/index.ts  |   1 +
 .../element/retime/update-element-retime.ts        | 114 +++++++++++++++++++++
 2 files changed, 115 insertions(+)
 create mode 100644 apps/web/src/lib/commands/timeline/element/retime/index.ts
 create mode 100644 apps/web/src/lib/commands/timeline/element/retime/update-element-retime.ts

(limited to 'apps/web/src/lib/commands/timeline/element/retime')

diff --git a/apps/web/src/lib/commands/timeline/element/retime/index.ts b/apps/web/src/lib/commands/timeline/element/retime/index.ts
new file mode 100644
index 00000000..5daa59bf
--- /dev/null
+++ b/apps/web/src/lib/commands/timeline/element/retime/index.ts
@@ -0,0 +1 @@
+export { UpdateElementRetimeCommand } from "./update-element-retime";
diff --git a/apps/web/src/lib/commands/timeline/element/retime/update-element-retime.ts b/apps/web/src/lib/commands/timeline/element/retime/update-element-retime.ts
new file mode 100644
index 00000000..d1f859e6
--- /dev/null
+++ b/apps/web/src/lib/commands/timeline/element/retime/update-element-retime.ts
@@ -0,0 +1,114 @@
+import { EditorCore } from "@/core";
+import { clampRetimeRate } from "@/constants/retime-constants";
+import { clampAnimationsToDuration } from "@/lib/animation";
+import { Command } from "@/lib/commands/base-command";
+import { getTimelineDurationForSourceSpan, getSourceSpanAtClipTime } from "@/lib/retime";
+import { isRetimableElement, updateElementInTracks } from "@/lib/timeline";
+import type { RetimeConfig, TimelineTrack } from "@/lib/timeline";
+
+function getSourceDuration({
+	trimStart,
+	trimEnd,
+	duration,
+	sourceDuration,
+	retime,
+}: {
+	trimStart: number;
+	trimEnd: number;
+	duration: number;
+	sourceDuration?: number;
+	retime?: RetimeConfig;
+}): number {
+	if (typeof sourceDuration === "number") {
+		return sourceDuration;
+	}
+
+	return (
+		trimStart +
+		getSourceSpanAtClipTime({
+			clipTime: duration,
+			retime,
+		}) +
+		trimEnd
+	);
+}
+
+export class UpdateElementRetimeCommand extends Command {
+	private savedState: TimelineTrack[] | null = null;
+	private readonly trackId: string;
+	private readonly elementId: string;
+	private readonly retime: RetimeConfig | undefined;
+
+	constructor({
+		trackId,
+		elementId,
+		retime,
+	}: {
+		trackId: string;
+		elementId: string;
+		retime?: RetimeConfig;
+	}) {
+		super();
+		this.trackId = trackId;
+		this.elementId = elementId;
+		this.retime = retime;
+	}
+
+	execute(): void {
+		const editor = EditorCore.getInstance();
+		this.savedState = editor.timeline.getTracks();
+
+		const updatedTracks = updateElementInTracks({
+			tracks: this.savedState,
+			trackId: this.trackId,
+			elementId: this.elementId,
+			elementPredicate: isRetimableElement,
+			update: (element) => {
+				if (!isRetimableElement(element)) {
+					return element;
+				}
+
+				const nextRetime = this.retime
+					? {
+							...this.retime,
+							rate: clampRetimeRate({ rate: this.retime.rate }),
+						}
+					: undefined;
+				const sourceDuration = getSourceDuration({
+					trimStart: element.trimStart,
+					trimEnd: element.trimEnd,
+					duration: element.duration,
+					sourceDuration: element.sourceDuration,
+					retime: element.retime,
+				});
+				const visibleSourceSpan = Math.max(
+					0,
+					sourceDuration - element.trimStart - element.trimEnd,
+				);
+				const nextDuration = getTimelineDurationForSourceSpan({
+					sourceSpan: visibleSourceSpan,
+					retime: nextRetime,
+				});
+
+				return {
+					...element,
+					retime: nextRetime,
+					duration: nextDuration,
+					animations: clampAnimationsToDuration({
+						animations: element.animations,
+						duration: nextDuration,
+					}),
+				};
+			},
+		});
+
+		editor.timeline.updateTracks(updatedTracks);
+	}
+
+	undo(): void {
+		if (this.savedState) {
+			const editor = EditorCore.getInstance();
+			editor.timeline.updateTracks(this.savedState);
+		}
+	}
+}
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