2 files changed, 10 insertions, 0 deletions
diff --git a/src/drivers/WinAPI/Fl_WinAPI_Screen_Driver.H b/src/drivers/WinAPI/Fl_WinAPI_Screen_Driver.H
index 80529138f..5c016ce73 100644
--- a/src/drivers/WinAPI/Fl_WinAPI_Screen_Driver.H
+++ b/src/drivers/WinAPI/Fl_WinAPI_Screen_Driver.H
@@ -77,6 +77,7 @@ public:
   virtual void enable_im();
   virtual void disable_im();
   virtual void open_display();
+  virtual void offscreen_size(Fl_Offscreen off, int &width, int &height);
 };
 
 
diff --git a/src/drivers/WinAPI/Fl_WinAPI_Screen_Driver.cxx b/src/drivers/WinAPI/Fl_WinAPI_Screen_Driver.cxx
index 6c3e99dca..2b1f65e0a 100644
--- a/src/drivers/WinAPI/Fl_WinAPI_Screen_Driver.cxx
+++ b/src/drivers/WinAPI/Fl_WinAPI_Screen_Driver.cxx
@@ -638,6 +638,15 @@ float Fl_WinAPI_Screen_Driver::desktop_scaling_factor() {
   return scaling;
 }
 
+void Fl_WinAPI_Screen_Driver::offscreen_size(Fl_Offscreen off, int &width, int &height)
+{
+  BITMAP bitmap;
+  if ( GetObject(off, sizeof(BITMAP), &bitmap) ) {
+    width = bitmap.bmWidth;
+    height = bitmap.bmHeight;
+  }
+}
+
 //
 // End of "$Id$".
 //