Index: trunk/psLib/src/imageops/psImageMaskOps.h
===================================================================
--- trunk/psLib/src/imageops/psImageMaskOps.h	(revision 21183)
+++ trunk/psLib/src/imageops/psImageMaskOps.h	(revision 25753)
@@ -22,4 +22,13 @@
 #include "psStats.h"
 #include "psPixels.h"
+
+/** Perform the mask opertion on all image pixels
+ *
+ *  The pixels are set by combining the existing pixel value and the given maskValue
+ *  with a logical operation.  The allowed operations are =, AND, OR, and XOR.
+ */
+void psImageMaskPixels(psImage *image,
+                       const char *op,
+                       psImageMaskType maskValue);
 
 /** Sets the bits inside the region, ignoring pixels outside.