1 files changed, 21 insertions, 1 deletions
diff --git a/generic/tkbltGrMisc.h b/generic/tkbltGrMisc.h
index ba86b75..5c16dce 100644
--- a/generic/tkbltGrMisc.h
+++ b/generic/tkbltGrMisc.h
@@ -104,6 +104,26 @@ namespace Blt {
     int offset;
   } Dashes;
 
+  typedef enum {
+    CLIP_OUTSIDE = 0,
+    CLIP_INSIDE  = 1 << 0,
+    CLIP_P       = 1 << 1,
+    CLIP_Q       = 1 << 2
+  } LineRectClipResult;
+
+  inline LineRectClipResult operator|(LineRectClipResult a, LineRectClipResult b) {
+    return static_cast<LineRectClipResult>(static_cast<int>(a) | static_cast<int>(b));
+  }
+
+  inline LineRectClipResult operator&(LineRectClipResult a, LineRectClipResult b) {
+    return static_cast<LineRectClipResult>(static_cast<int>(a) & static_cast<int>(b));
+  }
+
+  inline LineRectClipResult & operator|=(LineRectClipResult & rhs, LineRectClipResult v) {
+    rhs = rhs | v;
+    return rhs;
+  }
+
   extern char* dupstr(const char*);
   extern Graph* getGraphFromWindowData(Tk_Window tkwin);
 
@@ -111,7 +131,7 @@ namespace Blt {
 			    int nScreenPts);
   extern int polyRectClip(Region2d *extsPtr, Point2d *inputPts,
 			  int nInputPts, Point2d *outputPts);
-  extern int lineRectClip(Region2d *regionPtr, Point2d *p, Point2d *q);
+  extern LineRectClipResult lineRectClip(Region2d *regionPtr, Point2d *p, Point2d *q);
   extern Point2d getProjection (int x, int y, Point2d *p, Point2d *q);
 };