bug fix: 47694 Avoid create IOCA for background on empty areas

git-svn-id: https://svn.apache.org/repos/asf/xmlgraphics/fop/trunk@804268 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/fop/afp/AFPDitheredRectanglePainter.java

@@ -55,6 +55,9 @@ public class AFPDitheredRectanglePainter extends AbstractAFPPainter {
     /** {@inheritDoc} */
     public void paint(PaintingInfo paintInfo) throws IOException {
         RectanglePaintingInfo rectanglePaintInfo = (RectanglePaintingInfo)paintInfo;
+        if (rectanglePaintInfo.getWidth() <= 0 || rectanglePaintInfo.getHeight() <= 0) {
+            return;
+        }
 
         int ditherMatrix = DitherUtil.DITHER_MATRIX_8X8;
         Dimension ditherSize = new Dimension(ditherMatrix, ditherMatrix);

status.xml

@@ -58,6 +58,9 @@
       documents. Example: the fix of marks layering will be such a case when it's done.
     -->
     <release version="FOP Trunk" date="TBD">
+      <action context="Renderers" dev="CB" type="fix" fixes-bug="47694">
+        Dithered Background Shading can produce illegal AFP if objects are very small 
+      </action>
       <action context="Renderers" dev="CB" type="add">
         AFP Output: Added support for IMM Extension on fo:simple-page-master.
       </action>