1 files changed, 26 insertions, 1 deletions
diff --git a/src/drivers/Quartz/Fl_Quartz_Graphics_Driver_rect.cxx b/src/drivers/Quartz/Fl_Quartz_Graphics_Driver_rect.cxx
index 41c4c5cdd..be31149f9 100644
--- a/src/drivers/Quartz/Fl_Quartz_Graphics_Driver_rect.cxx
+++ b/src/drivers/Quartz/Fl_Quartz_Graphics_Driver_rect.cxx
@@ -199,6 +199,31 @@ void Fl_Quartz_Graphics_Driver::polygon(int x, int y, int x1, int y1, int x2, in
 
 // --- clipping
 
+// intersects current and x,y,w,h rectangle and returns result as a new Fl_Region
+static Fl_Region intersect_region_and_rect(Fl_Region current, int x,int y,int w, int h)
+{
+  if (current == NULL) return Fl_Graphics_Driver::XRectangleRegion(x,y,w,h);
+  CGRect r = Fl_Quartz_Graphics_Driver::fl_cgrectmake_cocoa(x, y, w, h);
+  Fl_Region outr = (Fl_Region)malloc(sizeof(*outr));
+  outr->count = current->count;
+  outr->rects =(CGRect*)malloc(outr->count * sizeof(CGRect));
+  int j = 0;
+  for(int i = 0; i < current->count; i++) {
+    CGRect test = CGRectIntersection(current->rects[i], r);
+    if (!CGRectIsEmpty(test)) outr->rects[j++] = test;
+  }
+  if (j) {
+    outr->count = j;
+    outr->rects = (CGRect*)realloc(outr->rects, outr->count * sizeof(CGRect));
+  }
+  else {
+    Fl_Graphics_Driver::XDestroyRegion(outr);
+    outr = Fl_Graphics_Driver::XRectangleRegion(0,0,0,0);
+  }
+  return outr;
+}
+
+
 void Fl_Quartz_Graphics_Driver::push_clip(int x, int y, int w, int h) {
   Fl_Region r;
   if (w > 0 && h > 0) {
@@ -206,7 +231,7 @@ void Fl_Quartz_Graphics_Driver::push_clip(int x, int y, int w, int h) {
     Fl_Region current = rstack[rstackptr];
     if (current) {
       XDestroyRegion(r);
-      r = Fl_X::intersect_region_and_rect(current, x,y,w,h);
+      r = intersect_region_and_rect(current, x,y,w,h);
     }
   } else { // make empty clip region:
     r = XRectangleRegion(0,0,0,0);