PowerPDF: added mixed roundrect (rounded and squared corners) support

git-svn-id: https://svn.code.sf.net/p/lazarus-ccr/svn@2183 8e941d3f-bd1b-0410-a28a-d453659cc2b4

components/powerpdf/PdfTypes.pas

@@ -78,6 +78,8 @@ type
     Left, Top, Right, Bottom: Single;
   end;
 
+  TPdfCorners = set of (pcTopLeft, pcBottomLeft, pcBottomRight, pcTopRight);
+
   TPdfObjectType = (otDirectObject, otIndirectObject, otVirtualObject);
   TPdfAlignment = (paLeftJustify, paRightJustify, paCenter);