From 4ca9bc95f8b1cf3bf2b3e06c3e0056ea5f10396f Mon Sep 17 00:00:00 2001
From: Manolo Gouy <Manolo>
Date: Sat, 27 Aug 2016 15:17:02 +0000
Subject: [PATCH] Fix Fl_Copy_Surface on Windows 10 when the display scaling
 factor is > 100%

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@11898 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
---
 src/Fl_Copy_Surface.cxx | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/Fl_Copy_Surface.cxx b/src/Fl_Copy_Surface.cxx
index 5321d7d33..5c578bf62 100644
--- a/src/Fl_Copy_Surface.cxx
+++ b/src/Fl_Copy_Surface.cxx
@@ -87,11 +87,14 @@ Fl_Copy_Surface::Fl_Copy_Surface(int w, int h) :  Fl_Surface_Device(NULL)
   int hdots = GetDeviceCaps(hdc, HORZRES);
   int vmm = GetDeviceCaps(hdc, VERTSIZE);
   int vdots = GetDeviceCaps(hdc, VERTRES);
+  int dhr = GetDeviceCaps(hdc, DESKTOPHORZRES); // true number of pixels on display
   ReleaseDC(NULL, hdc);
   float factorw = (100.f * hmm) / hdots;
   float factorh = (100.f * vmm) / vdots;
+  // Global display scaling factor: 1, 1.25, 1.5, 1.75, etc...
+  float scaling = dhr/float(hdots);
   
-  RECT rect; rect.left = 0; rect.top = 0; rect.right = (LONG)(w * factorw); rect.bottom = (LONG)(h * factorh);
+  RECT rect; rect.left = 0; rect.top = 0; rect.right = (LONG)(w * factorw / scaling); rect.bottom = (LONG)(h * factorh / scaling);
   gc = CreateEnhMetaFile (NULL, NULL, &rect, NULL);
   if (gc != NULL) {
     SetTextAlign(gc, TA_BASELINE|TA_LEFT);