From: gmungoc <g.m.carstairs@dundee.ac.uk>
Date: Thu, 10 Oct 2019 14:15:34 +0000 (+0100)
Subject: JAL-3444 missed commit of removal of object creation test.
X-Git-Url: http://source.jalview.org/gitweb/?a=commitdiff_plain;h=447c5c1b22bd12a78730640321264fb38c39ec7b;hp=9b692e0079f05e5e0bf1fca16d9b305c719d7dfb;p=jalview.git

JAL-3444 missed commit of removal of object creation test.
---

diff --git a/src/jalview/renderer/seqfeatures/FeatureColourFinder.java b/src/jalview/renderer/seqfeatures/FeatureColourFinder.java
index ee40d83..57366b9 100644
--- a/src/jalview/renderer/seqfeatures/FeatureColourFinder.java
+++ b/src/jalview/renderer/seqfeatures/FeatureColourFinder.java
@@ -99,10 +99,16 @@ public class FeatureColourFinder
     if (featureRenderer.getTransparency() != 1f)
     {
       g = goff;
-      if (defaultColour != null)
+      Color c = (defaultColour == null ? Color.white : defaultColour);
+      if (Platform.isJS())
       {
-        offscreenImage.setRGB(0, 0, defaultColour.getRGB());
+        // Clear the HTML5 canvas color.
+        // otherwise we get a smearing.
+        // For whatever reason, this is necessary BH 2019.10.01.
+        g.setColor(c);
+        g.fillRect(0, 0, 1, 1);
       }
+      offscreenImage.setRGB(0, 0, c.getRGB());
     }
 
     Color c = featureRenderer.findFeatureColour(seq, column + 1, g);