basebmp: B2IRange::isEmpty is surprisingly, unhelpfully lame - workaround

basebmp/source/bitmapdevice.cxx

@@ -1343,6 +1343,10 @@ namespace
         if( aLocalSourceArea.isEmpty() )
             return false;
 
+        // isEmpty is not what we want I think ...
+        if( aLocalSourceArea.getWidth() <= 0 || aLocalSourceArea.getHeight() <= 0 )
+            return false;
+
         // calc relative new source area points (relative to orig
         // source area)
         const ::basegfx::B2IVector aUpperLeftOffset(
@@ -1359,6 +1363,10 @@ namespace
         if( aLocalDestArea.isEmpty() )
             return false;
 
+        // isEmpty is not what we want I think ...
+        if( aLocalDestArea.getWidth() <= 0 || aLocalDestArea.getHeight() <= 0 )
+            return false;
+
         // calc relative new dest area points (relative to orig
         // source area)
         const ::basegfx::B2IVector aDestUpperLeftOffset(
@@ -1398,6 +1406,10 @@ namespace
         if( aLocalSourceArea.isEmpty() )
             return false;
 
+         // sadly isEmpty is not what we want I think ...
+        if( aLocalSourceArea.getWidth() <= 0 || aLocalSourceArea.getHeight() <= 0 )
+            return false;
+
         // calc relative new source area points (relative to orig
         // source area)
         const ::basegfx::B2IVector aUpperLeftOffset(
@@ -1416,6 +1428,10 @@ namespace
         if( aLocalDestArea.isEmpty() )
             return false;
 
+        // isEmpty is not what we want I think ...
+        if( aLocalDestArea.getWidth() <= 0 || aLocalDestArea.getHeight() <= 0 )
+            return false;
+
         // calc relative new dest area points (relative to orig
         // source area)
         const ::basegfx::B2IVector aDestUpperLeftOffset(