From c46d28891fee62ca2d3132da876af6411a41d9da Mon Sep 17 00:00:00 2001
From: Maze Winther <mazewinther@gmail.com>
Date: Wed, 15 Apr 2026 15:45:50 +0200
Subject: feat: text / custom masks, fix preview pan, refactor selection

---
 .../editor/panels/timeline/audio-waveform.tsx      | 48 +++++++++++++++++++++-
 .../editor/panels/timeline/timeline-element.tsx    | 18 ++++++--
 2 files changed, 61 insertions(+), 5 deletions(-)

(limited to 'apps/web/src/components/editor/panels/timeline')

diff --git a/apps/web/src/components/editor/panels/timeline/audio-waveform.tsx b/apps/web/src/components/editor/panels/timeline/audio-waveform.tsx
index a481f1c2..430575e1 100644
--- a/apps/web/src/components/editor/panels/timeline/audio-waveform.tsx
+++ b/apps/web/src/components/editor/panels/timeline/audio-waveform.tsx
@@ -9,9 +9,34 @@ import { cn } from "@/utils/ui";
 const BAR_WIDTH = 2;
 const BAR_GAP = 1;
 const BAR_STEP = BAR_WIDTH + BAR_GAP;
+export const WAVEFORM_GAIN_SAMPLE_COUNT = 200;
+
+function sampleGain({
+	samples,
+	startFraction,
+	endFraction,
+	barIndex,
+	barCount,
+}: {
+	samples: number[];
+	startFraction: number;
+	endFraction: number;
+	barIndex: number;
+	barCount: number;
+}): number {
+	if (samples.length === 0) return 1;
+	const progress =
+		startFraction +
+		((barIndex + 0.5) / barCount) * (endFraction - startFraction);
+	const rawIndex = Math.max(0, Math.min(1, progress)) * (samples.length - 1);
+	const lo = Math.floor(rawIndex);
+	const hi = Math.min(samples.length - 1, lo + 1);
+	return samples[lo] + (samples[hi] - samples[lo]) * (rawIndex - lo);
+}
 interface AudioWaveformProps {
 	audioUrl?: string;
 	audioBuffer?: AudioBuffer;
+	gainSamples?: number[];
 	color?: string;
 	className?: string;
 }
@@ -19,6 +44,7 @@ interface AudioWaveformProps {
 export function AudioWaveform({
 	audioUrl,
 	audioBuffer,
+	gainSamples,
 	color = "rgba(255, 255, 255, 0.7)",
 	className = "",
 }: AudioWaveformProps) {
@@ -26,6 +52,7 @@ export function AudioWaveform({
 	const containerRef = useRef<HTMLDivElement>(null);
 	const bufferRef = useRef<AudioBuffer | null>(null);
 	const globalMaxRef = useRef<number>(1);
+	const gainSamplesRef = useRef<number[] | undefined>(gainSamples);
 	const scrollParentRef = useRef<HTMLElement | null>(null);
 	const heightRef = useRef<number>(0);
 
@@ -99,20 +126,37 @@ export function AudioWaveform({
 
 		const maxBarHeight = height * 0.7;
 
+		const samples = gainSamplesRef.current;
 		for (let i = 0; i < barCount; i++) {
-			const scaled = Math.log1p(peaks[i]) / Math.log1p(1);
+			const gain =
+				samples != null
+					? sampleGain({
+							samples,
+							startFraction,
+							endFraction,
+							barIndex: i,
+							barCount,
+						})
+					: 1;
+			const scaledPeak = Math.min(1, Math.max(0, peaks[i] * gain));
+			const scaled = Math.log1p(scaledPeak) / Math.log1p(1);
 			const barH = Math.max(1, scaled * maxBarHeight);
 			ctx.fillRect(i * BAR_STEP, height - barH, BAR_WIDTH, barH);
 		}
 	}, [color]);
 
+	useEffect(() => {
+		gainSamplesRef.current = gainSamples;
+		drawVisible();
+	}, [gainSamples, drawVisible]);
+
 	useEffect(() => {
 		let isCancelled = false;
 
 		async function load() {
 			let buffer = audioBuffer ?? null;
 
-				if (!buffer && audioUrl) {
+			if (!buffer && audioUrl) {
 				try {
 					const resp = await fetch(audioUrl);
 					const arrayBuffer = await resp.arrayBuffer();
diff --git a/apps/web/src/components/editor/panels/timeline/timeline-element.tsx b/apps/web/src/components/editor/panels/timeline/timeline-element.tsx
index 644dbc56..9283c651 100644
--- a/apps/web/src/components/editor/panels/timeline/timeline-element.tsx
+++ b/apps/web/src/components/editor/panels/timeline/timeline-element.tsx
@@ -2,7 +2,7 @@
 
 import { useEditor } from "@/hooks/use-editor";
 import { useAssetsPanelStore } from "@/stores/assets-panel-store";
-import { AudioWaveform } from "./audio-waveform";
+import { AudioWaveform, WAVEFORM_GAIN_SAMPLE_COUNT } from "./audio-waveform";
 import { useElementPreview } from "@/hooks/use-element-preview";
 import {
 	useKeyframeDrag,
@@ -44,6 +44,7 @@ import {
 	getSourceAudioActionLabel,
 	isSourceAudioSeparated,
 } from "@/lib/timeline/audio-separation";
+import { buildWaveformGainSamples } from "@/lib/timeline/audio-state";
 import {
 	getActionDefinition,
 	type TAction,
@@ -382,6 +383,7 @@ export function TimelineElement({
 				>
 					<ElementInner
 						element={element}
+						displayElement={renderElement}
 						track={track}
 						isSelected={isSelected}
 						isExpanded={expandedRows.length > 0}
@@ -498,6 +500,7 @@ export function TimelineElement({
 
 function ElementInner({
 	element,
+	displayElement,
 	track,
 	isSelected,
 	isExpanded,
@@ -509,6 +512,7 @@ function ElementInner({
 	isDropTarget = false,
 }: {
 	element: TimelineElementType;
+	displayElement?: TimelineElementType;
 	track: TimelineTrack;
 	isSelected: boolean;
 	isExpanded: boolean;
@@ -530,8 +534,10 @@ function ElementInner({
 	}) => void;
 	isDropTarget?: boolean;
 }) {
+	const visibleElement = displayElement ?? element;
 	const isReducedOpacity =
-		(canElementBeHidden(element) && element.hidden) || isDropTarget;
+		(canElementBeHidden(visibleElement) && visibleElement.hidden) ||
+		isDropTarget;
 	return (
 		<div
 			className="absolute top-0 bottom-0"
@@ -576,7 +582,7 @@ function ElementInner({
 							style={{ height: `${baseTrackHeight}px` }}
 						>
 							<div className="flex flex-1 min-h-0 h-full items-center overflow-hidden">
-								<ElementContent element={element} track={track} />
+								<ElementContent element={visibleElement} track={track} />
 							</div>
 						</div>
 						{expandedContent}
@@ -979,6 +985,11 @@ function AudioElementContent({ element }: { element: AudioElement }) {
 	const audioUrl =
 		element.sourceType === "library" ? element.sourceUrl : mediaAsset?.url;
 	const mediaLabel = mediaAsset?.name ?? element.name;
+	const gainSamples = useMemo(
+		() =>
+			buildWaveformGainSamples({ element, count: WAVEFORM_GAIN_SAMPLE_COUNT }),
+		[element],
+	);
 
 	if (audioBuffer || audioUrl) {
 		return (
@@ -986,6 +997,7 @@ function AudioElementContent({ element }: { element: AudioElement }) {
 				<AudioWaveform
 					audioBuffer={audioBuffer}
 					audioUrl={audioUrl}
+					gainSamples={gainSamples}
 					color={TIMELINE_TRACK_THEME.audio.waveformColor}
 				/>
 				<MediaElementHeader name={mediaLabel} hasFade={false} />
-- 
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