From fe4d1af1949bc84ea6c17c0e64e9e5758d623ebd Mon Sep 17 00:00:00 2001
From: Manolo Gouy <Manolo>
Date: Sat, 22 Feb 2014 15:04:44 +0000
Subject: Check for use of the Fl_GDI_Printer_Graphics_Driver class to detect
 printer usage.

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@10111 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
---
 src/Fl_Double_Window.cxx | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

(limited to 'src')

diff --git a/src/Fl_Double_Window.cxx b/src/Fl_Double_Window.cxx
index fb93c9cd9..4cc487215 100644
--- a/src/Fl_Double_Window.cxx
+++ b/src/Fl_Double_Window.cxx
@@ -218,8 +218,9 @@ void Fl_GDI_Graphics_Driver::copy_offscreen_with_alpha(int x,int y,int w,int h,H
   BOOL alpha_ok = 0;
   // first try to alpha blend
   // if to printer, always try alpha_blend
-  if ( Fl_Surface_Device::surface() != Fl_Display_Device::display_device() || fl_can_do_alpha_blending() ) {
-    if (fl_alpha_blend) alpha_ok = fl_alpha_blend(fl_gc, x, y, w, h, new_gc, srcx, srcy, w, h, blendfunc);
+  if (fl_graphics_driver->class_name() == Fl_GDI_Printer_Graphics_Driver::class_id && fl_alpha_blend ||
+      Fl_Surface_Device::surface() == Fl_Display_Device::display_device() && fl_can_do_alpha_blending() ) {
+    alpha_ok = fl_alpha_blend(fl_gc, x, y, w, h, new_gc, srcx, srcy, w, h, blendfunc);
   }
   // if that failed (it shouldn't), still copy the bitmap over, but now alpha is 1
   if (!alpha_ok) {
-- 
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