Fixed problem in TextRenderer where custom render delegates would

result in corrupted backing store due to semantics of
Graphics.copyArea() paying attention to transparent pixels; need to
clear out the destination rectangle first


git-svn-id: file:///usr/local/projects/SUN/JOGL/git-svn/svn-server-sync/jogl/trunk@1248 232f8b59-042b-4e1e-8c03-345bb8c30851

1 files changed, 8 insertions, 0 deletions

diff --git a/src/classes/com/sun/opengl/util/j2d/TextRenderer.java b/src/classes/com/sun/opengl/util/j2d/TextRenderer.java
index 2bbd2ee60..7d0a8ea2d 100755
--- a/src/classes/com/sun/opengl/util/j2d/TextRenderer.java
+++ b/src/classes/com/sun/opengl/util/j2d/TextRenderer.java
@@ -882,6 +882,14 @@ public class TextRenderer {
       TextureRenderer oldRenderer = (TextureRenderer) oldBackingStore;
       TextureRenderer newRenderer = (TextureRenderer) newBackingStore;
 
+      if (!renderDelegate.intensityOnly()) {
+        // Transparent pixels in the source image will not overwrite
+        // the contents of the backing store
+        g.setComposite(AlphaComposite.Clear);
+        g.fillRect(newLocation.x(), newLocation.y(), newLocation.w(), newLocation.h());
+        g.setComposite(AlphaComposite.Src);
+      }
+
       if (oldRenderer == newRenderer) {
         // Movement on the same backing store -- easy case
         g.copyArea(oldLocation.x(), oldLocation.y(),