commit 842cbf0f1023f798362ab77aef34da23a24490b7
Author:     ManoloFLTK <41016272+ManoloFLTK@users.noreply.github.com>
AuthorDate: Sun Feb 21 18:08:33 2021 +0100
Commit:     ManoloFLTK <41016272+ManoloFLTK@users.noreply.github.com>
CommitDate: Sun Feb 21 18:08:33 2021 +0100

    Fix for issue #192: focus box drawing incorrectly on OSX (e.g. 10.10.5) at scales >100%

 src/drivers/Quartz/Fl_Quartz_Graphics_Driver.H        |  1 +
 src/drivers/Quartz/Fl_Quartz_Graphics_Driver_rect.cxx | 14 ++++++++++++++
 2 files changed, 15 insertions(+)

diff --git src/drivers/Quartz/Fl_Quartz_Graphics_Driver.H src/drivers/Quartz/Fl_Quartz_Graphics_Driver.H
index 76edc41..b61761d 100644
--- src/drivers/Quartz/Fl_Quartz_Graphics_Driver.H
+++ src/drivers/Quartz/Fl_Quartz_Graphics_Driver.H
@@ -95,6 +95,7 @@ protected:
   // --- implementation is in src/fl_rect.cxx which includes src/cfg_gfx/quartz_rect.cxx
   void point(int x, int y);
   void rect(int x, int y, int w, int h);
+  void focus_rect(int x, int y, int w, int h);
   void rectf(int x, int y, int w, int h);
   void line(int x, int y, int x1, int y1);
   void line(int x, int y, int x1, int y1, int x2, int y2);
diff --git src/drivers/Quartz/Fl_Quartz_Graphics_Driver_rect.cxx src/drivers/Quartz/Fl_Quartz_Graphics_Driver_rect.cxx
index b238e9a..52b8c7f 100644
--- src/drivers/Quartz/Fl_Quartz_Graphics_Driver_rect.cxx
+++ src/drivers/Quartz/Fl_Quartz_Graphics_Driver_rect.cxx
@@ -17,6 +17,7 @@
 
 #include <FL/Fl.H>
 #include <FL/platform.H>
+#include <math.h>
 
 
 /**
@@ -42,6 +43,19 @@ void Fl_Quartz_Graphics_Driver::rect(int x, int y, int w, int h) {
   if ( (!has_feature(PRINTER)) && quartz_line_width_ > 1.5f) CGContextSetShouldAntialias(gc_, false);
 }
 
+void Fl_Quartz_Graphics_Driver::focus_rect(int x, int y, int w, int h)
+{
+  CGContextSaveGState(gc_);
+  float s = scale();
+  CGContextScaleCTM(gc_, 1/s, 1/s);
+  CGFloat lw = (s >= 1 ? floor(s) : 1);
+  CGContextSetLineWidth(gc_, lw);
+  CGFloat dots[2] = {lw, lw};
+  CGContextSetLineDash(gc_, 0, dots, 2);
+  CGContextStrokeRect(gc_, CGRectMake(x*s, y*s, (w-1)*s, (h-1)*s));
+  CGContextRestoreGState(gc_);
+}
+
 void Fl_Quartz_Graphics_Driver::rectf(int x, int y, int w, int h) {
   if (w<=0 || h<=0) return;
   CGRect rect = CGRectMake(x - 0.5, y - 0.5, w , h);