Fixed the opacity of the nested elements (thanks to Paolo Ferracin)

ebourg · Jul 6, 2016 · efe6098 · efe6098
1 parent 3e71580
commit efe6098
Showing 1 changed file with 21 additions and 1 deletion.
diff --git a/core/src/main/java/org/pushingpixels/flamingo/api/svg/SvgTranscoder.java b/core/src/main/java/org/pushingpixels/flamingo/api/svg/SvgTranscoder.java
@@ -362,7 +362,7 @@ private void transcodeCompositeChange(AlphaComposite composite) {
      * @throws UnsupportedOperationException if the graphics node is unsupported.
      */
     private void transcodeGraphicsNode(GraphicsNode node, String comment) throws UnsupportedOperationException {
-        transcodeCompositeChange((AlphaComposite) node.getComposite());
+        transcodeCompositeChange(getAbsoluteAlphaComposite(node));
 
         AffineTransform transform = node.getTransform();
         if (transform != null && !transform.isIdentity()) {
@@ -393,6 +393,26 @@ private void transcodeGraphicsNode(GraphicsNode node, String comment) throws Uns
         }
     }
 
+    /**
+     * Get the absolute alpha composite of a node.
+     */
+    private AlphaComposite getAbsoluteAlphaComposite(GraphicsNode node) {
+        AlphaComposite composite = (AlphaComposite) node.getComposite();
+
+        if (composite != null) {
+            float alpha = composite.getAlpha();
+            while ((node = node.getParent()) != null) {
+                AlphaComposite parentComposite = (AlphaComposite) node.getComposite();
+                if (parentComposite != null) {
+                    alpha = alpha * parentComposite.getAlpha();
+                }
+            }
+            composite = AlphaComposite.getInstance(composite.getRule(), alpha);
+        }
+
+        return composite;
+    }
+
     /**
      * Transcode the specified text node.
      *