add convenience function to clip using x2,y2 instead of w,h

libvncserver/rfbregion.c

@@ -803,6 +803,28 @@ sraClipRect(int *x, int *y, int *w, int *h,
   return (*w>0) && (*h>0);
 }
 
+rfbBool
+sraClipRect2(int *x, int *y, int *x2, int *y2,
+	    int cx, int cy, int cx2, int cy2) {
+  if (*x < cx)
+    *x = cx;
+  if (*y < cy)
+    *y = cy;
+  if (*x >= cx2)
+    *x = cx2-1;
+  if (*y >= cy2)
+    *y = cy2-1;
+  if (*x2 <= cx)
+    *x2 = cx+1;
+  if (*y2 <= cy)
+    *y2 = cy+1;
+  if (*x2 > cx2)
+    *x2 = cx2;
+  if (*y2 > cy2)
+    *y2 = cy2;
+  return (*x2>*x) && (*y2>*y);
+}
+
 /* test */
 
 #ifdef SRA_TEST

rfb/rfbregion.h

@@ -59,4 +59,7 @@ void sraRgnPrint(const sraRegion *s);
 extern rfbBool sraClipRect(int *x, int *y, int *w, int *h,
 			int cx, int cy, int cw, int ch);
 
+extern rfbBool sraClipRect2(int *x, int *y, int *x2, int *y2,
+			int cx, int cy, int cx2, int cy2);
+
 #endif