Under Mac OS 10.11 beta, fl_xyline(init,int,int) and fl_yxline(init,i…

…nt,int) produce bizarre graphics just after

processing a mouse or keyboard event (they are OK in other cases).
We fix that by filling a rectangle instead of stroking along a line (and hope the public 10.11 will have fixed that).

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@10803 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

src/fl_rect.cxx

@@ -202,16 +202,21 @@ void Fl_Graphics_Driver::xyline(int x, int y, int x1) {
   MoveToEx(fl_gc, x, y, 0L); LineTo(fl_gc, x1+1, y);
 #elif defined(__APPLE_QUARTZ__)
   if (USINGQUARTZPRINTER || fl_quartz_line_width_ > 1.5f) CGContextSetShouldAntialias(fl_gc, true);
-  CGContextMoveToPoint(fl_gc, x, y);
-  CGContextAddLineToPoint(fl_gc, x1, y);
-  CGContextStrokePath(fl_gc);
-  if (Fl_Display_Device::high_resolution()) {
-    /* On retina displays, all xyline() and yxline() functions produce lines that are half-unit
-     (or one pixel) too short at both ends. This is corrected by filling at both ends rectangles
-     of size one unit by line-width.
-     */
-    CGContextFillRect(fl_gc, CGRectMake(x-0.5 , y  - fl_quartz_line_width_/2, 1 , fl_quartz_line_width_));
-    CGContextFillRect(fl_gc, CGRectMake(x1-0.5 , y  - fl_quartz_line_width_/2, 1 , fl_quartz_line_width_));
+  if (fl_mac_os_version >= 101100) {
+    // bizarrely, the line drawing does not always work with 10.11, draw a thin rectangle instead
+    CGContextFillRect(fl_gc, CGRectMake((x1>x?x:x1) - 0.5, y - fl_quartz_line_width_/2, (x1>x?x1-x:x-x1)+1, fl_quartz_line_width_));
+   } else {
+    CGContextMoveToPoint(fl_gc, x, y);
+    CGContextAddLineToPoint(fl_gc, x1, y);
+    CGContextStrokePath(fl_gc);
+    if (Fl_Display_Device::high_resolution()) {
+      /* On retina displays, all xyline() and yxline() functions produce lines that are half-unit
+       (or one pixel) too short at both ends. This is corrected by filling at both ends rectangles
+       of size one unit by line-width.
+       */
+      CGContextFillRect(fl_gc, CGRectMake(x-0.5 , y  - fl_quartz_line_width_/2, 1 , fl_quartz_line_width_));
+      CGContextFillRect(fl_gc, CGRectMake(x1-0.5 , y  - fl_quartz_line_width_/2, 1 , fl_quartz_line_width_));
+    }
   }
   if (USINGQUARTZPRINTER || fl_quartz_line_width_ > 1.5f) CGContextSetShouldAntialias(fl_gc, false);
 #else
@@ -287,12 +292,19 @@ void Fl_Graphics_Driver::yxline(int x, int y, int y1) {
   MoveToEx(fl_gc, x, y, 0L); LineTo(fl_gc, x, y1);
 #elif defined(__APPLE_QUARTZ__)
   if (USINGQUARTZPRINTER || fl_quartz_line_width_ > 1.5f) CGContextSetShouldAntialias(fl_gc, true);
-  CGContextMoveToPoint(fl_gc, x, y);
-  CGContextAddLineToPoint(fl_gc, x, y1);
-  CGContextStrokePath(fl_gc);
-  if (Fl_Display_Device::high_resolution()) {
-    CGContextFillRect(fl_gc, CGRectMake(x  -  fl_quartz_line_width_/2, y-0.5, fl_quartz_line_width_, 1));
-    CGContextFillRect(fl_gc, CGRectMake(x  -  fl_quartz_line_width_/2, y1-0.5, fl_quartz_line_width_, 1));
+  if (fl_mac_os_version >= 101100) {
+    // bizarrely, the line drawing does not always work with 10.11, draw a thin rectangle instead
+    CGContextFillRect(fl_gc, CGRectMake(x - fl_quartz_line_width_/2, (y>y1?y1:y) - 0.5,
+                                        fl_quartz_line_width_ , (y>y1?y-y1:y1-y)+1));
+  }
+  else {
+    CGContextMoveToPoint(fl_gc, x, y);
+    CGContextAddLineToPoint(fl_gc, x, y1);
+    CGContextStrokePath(fl_gc);
+    if (Fl_Display_Device::high_resolution()) {
+      CGContextFillRect(fl_gc, CGRectMake(x  -  fl_quartz_line_width_/2, y-0.5, fl_quartz_line_width_, 1));
+      CGContextFillRect(fl_gc, CGRectMake(x  -  fl_quartz_line_width_/2, y1-0.5, fl_quartz_line_width_, 1));
+    }
   }
   if (USINGQUARTZPRINTER || fl_quartz_line_width_ > 1.5f) CGContextSetShouldAntialias(fl_gc, false);
 #else