From 0d7a6ba0b6862fa666712d49a4f8d5e45fe4ff85 Mon Sep 17 00:00:00 2001
From: gmungoc <g.m.carstairs@dundee.ac.uk>
Date: Thu, 3 Oct 2019 13:39:28 +0100
Subject: [PATCH] JAL-3444 transparent colour for alignment in JS

---
 src/jalview/renderer/seqfeatures/FeatureColourFinder.java |   10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/jalview/renderer/seqfeatures/FeatureColourFinder.java b/src/jalview/renderer/seqfeatures/FeatureColourFinder.java
index b92d57b..ee40d83 100644
--- a/src/jalview/renderer/seqfeatures/FeatureColourFinder.java
+++ b/src/jalview/renderer/seqfeatures/FeatureColourFinder.java
@@ -28,7 +28,6 @@ import jalview.viewmodel.seqfeatures.FeatureRendererModel;
 
 import java.awt.Color;
 import java.awt.Graphics;
-import java.awt.Graphics2D;
 import java.awt.image.BufferedImage;
 
 /**
@@ -114,8 +113,17 @@ public class FeatureColourFinder
 
     if (g != null)
     {
+      if (Platform.isJS())
+      {
+        /*
+         * for JavaScript the pixel itself
+         * is a resource that needs to be recreated in getRGB(0,0)
+         */
+        offscreenImage.flush();
+      }
       c = new Color(offscreenImage.getRGB(0, 0));
     }
+
     return c;
   }
 
-- 
1.7.10.2