From 3a5b85a40d34472e0b73e2b63710235e436ecbe8 Mon Sep 17 00:00:00 2001
From: Roman Birg <roman@cyngn.com>
Date: Wed, 24 Jun 2015 22:12:05 -0700
Subject: visualizer: don't draw fade out paint when there's no content

Smoothes out transitions from song to song

Change-Id: I3d8485d34d33de1b6f2f76ca3930e18830025dac
Signed-off-by: Roman Birg <roman@cyngn.com>
---
 src/com/pheelicks/visualizer/VisualizerView.java | 20 +++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)

diff --git a/src/com/pheelicks/visualizer/VisualizerView.java b/src/com/pheelicks/visualizer/VisualizerView.java
index dcbdcd0..5285336 100644
--- a/src/com/pheelicks/visualizer/VisualizerView.java
+++ b/src/com/pheelicks/visualizer/VisualizerView.java
@@ -54,6 +54,8 @@ public class VisualizerView extends View {
     private AudioData mAudioData;
     private FFTData mFftData;
 
+    private long mLastUpdate;
+
     public VisualizerView(Context context, AttributeSet attrs, int defStyle) {
         super(context, attrs);
         init();
@@ -134,12 +136,20 @@ public class VisualizerView extends View {
             };
 
             mVisualizer.setDataCaptureListener(captureListener,
-                    (int) (Visualizer.getMaxCaptureRate() * 0.75), true, true);
+                    (int) (Visualizer.getMaxCaptureRate() * 0.75), captureWaveForm(), captureFft());
 
         }
         mVisualizer.setEnabled(true);
     }
 
+    protected boolean captureWaveForm() {
+        return false;
+    }
+
+    protected boolean captureFft() {
+        return true;
+    }
+
     public void unlink() {
         if (mVisualizer != null) {
             mVisualizer.setEnabled(false);
@@ -180,6 +190,7 @@ public class VisualizerView extends View {
     public void updateVisualizer(byte[] bytes) {
         mBytes = bytes;
         mAudioData.bytes = bytes;
+        mLastUpdate = System.currentTimeMillis();
         invalidate();
     }
 
@@ -193,6 +204,7 @@ public class VisualizerView extends View {
     public void updateVisualizerFFT(byte[] bytes) {
         mFFTBytes = bytes;
         mFftData.bytes = bytes;
+        mLastUpdate = System.currentTimeMillis();
         invalidate();
     }
 
@@ -243,8 +255,10 @@ public class VisualizerView extends View {
             }
         }
 
-        // Fade out old contents
-        mCanvas.drawPaint(mFadePaint);
+        if (System.currentTimeMillis() - mLastUpdate < 400) {
+            // Fade out old contents
+            mCanvas.drawPaint(mFadePaint);
+        }
 
         if (mFlash) {
             mFlash = false;
-- 
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