Fix fl_overlay_rect() under X11 and Windows when GUI is scaled.

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.4@12891 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

1 files changed, 9 insertions, 1 deletions

diff --git a/src/drivers/WinAPI/Fl_WinAPI_Screen_Driver.cxx b/src/drivers/WinAPI/Fl_WinAPI_Screen_Driver.cxx
index a675d1620..d93a2df6d 100644
--- a/src/drivers/WinAPI/Fl_WinAPI_Screen_Driver.cxx
+++ b/src/drivers/WinAPI/Fl_WinAPI_Screen_Driver.cxx
@@ -503,7 +503,15 @@ Fl_WinAPI_Screen_Driver::read_win_rectangle(
                                             int   h)		// I - Height of area to read
 {
   float s = Fl_Surface_Device::surface()->driver()->scale();
-  return read_win_rectangle_unscaled(X*s, Y*s, w*s, h*s);
+  int ws, hs;
+  if (int(s) == s) { ws = w * s; hs = h * s;}
+  else {
+    ws = (w+1)*s-1;
+    hs = (h+1)*s-1;
+    if (ws < 1) ws = 1;
+    if (hs < 1) hs = 1;
+  }
+  return read_win_rectangle_unscaled(X*s, Y*s, ws, hs);
 }
 
 Fl_RGB_Image *Fl_WinAPI_Screen_Driver::read_win_rectangle_unscaled(int X, int Y, int w, int h)