From 5df09ec975568a233e62d0be071fa9725d6b5aac Mon Sep 17 00:00:00 2001
From: skal <pascal.massimino@gmail.com>
Date: Wed, 18 Feb 2026 17:33:42 +0100
Subject: perf(mq_editor): move playhead to overlay canvas, avoid full render
 on tick

setPlayheadTime() now updates only the playhead overlay and spectrum panel
instead of triggering a full renderSpectrogram() every rAF tick.

handoff(Gemini): playhead is now an overlay canvas (like cursorCanvas),
no more O(n_frames) redraw during playback.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
---
 tools/mq_editor/index.html | 1 +
 1 file changed, 1 insertion(+)

(limited to 'tools/mq_editor/index.html')

diff --git a/tools/mq_editor/index.html b/tools/mq_editor/index.html
index 4292a5f..49a9869 100644
--- a/tools/mq_editor/index.html
+++ b/tools/mq_editor/index.html
@@ -332,6 +332,7 @@
       <div style="position: relative;">
         <canvas id="canvas" width="1400" height="600"></canvas>
         <canvas id="cursorCanvas" width="1400" height="600" style="position:absolute;top:0;left:0;pointer-events:none;"></canvas>
+        <canvas id="playheadCanvas" width="1400" height="600" style="position:absolute;top:0;left:0;pointer-events:none;"></canvas>
 
         <!-- Mini spectrum viewer (bottom-right overlay) -->
         <div id="spectrumViewer" style="position: absolute; bottom: 10px; right: 10px; width: 400px; height: 100px; background: rgba(30, 30, 30, 0.9); border: 1px solid #555; border-radius: 3px; pointer-events: none;">
-- 
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