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-rw-r--r--win/tkWinRegion.c27
1 files changed, 26 insertions, 1 deletions
diff --git a/win/tkWinRegion.c b/win/tkWinRegion.c
index c7be771..8a50620 100644
--- a/win/tkWinRegion.c
+++ b/win/tkWinRegion.c
@@ -8,7 +8,7 @@
* See the file "license.terms" for information on usage and redistribution
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
- * RCS: @(#) $Id: tkWinRegion.c,v 1.2 1998/09/14 18:24:01 stanton Exp $
+ * RCS: @(#) $Id: tkWinRegion.c,v 1.3 2002/06/14 13:35:49 dkf Exp $
*/
#include "tkWinInt.h"
@@ -177,3 +177,28 @@ TkRectInRegion(r, x, y, width, height)
rect.right = x+width;
return RectInRegion((HRGN)r, &rect) ? RectanglePart : RectangleOut;
}
+
+/*
+ *----------------------------------------------------------------------
+ *
+ * TkSubtractRegion --
+ *
+ * Compute the set-difference of two regions.
+ *
+ * Results:
+ * Returns the result in the dr_return region.
+ *
+ * Side effects:
+ * None.
+ *
+ *----------------------------------------------------------------------
+ */
+
+void
+TkSubtractRegion(sra, srb, dr_return)
+ TkRegion sra;
+ TkRegion srb;
+ TkRegion dr_return;
+{
+ CombineRgn((HRGN) dr_return, (HRGN) sra, (HRGN) srb, RGN_DIFF);
+}