therwise return null. A generated XObject shall be
 placed in the current viewport according to the two parameters "origin" and "pos".
<P>
<DD><DL>
<DT><B>Specified by:</B><DD><CODE><A HREF="../../../../../org/apache/fop/render/pdf/PDFImageHandler.html#generateImage(org.apache.fop.render.RendererContext, org.apache.xmlgraphics.image.loader.Image, java.awt.Point, java.awt.Rectangle)">generateImage</A></CODE> in interface <CODE><A HREF="../../../../../org/apache/fop/render/pdf/PDFImageHandler.html" title="int