Recognize VC12 (a.k.a. MSVS 2013) and define __VISUALC12__ for it.

[wxWidgets.git] / interface / wx / dcmemory.h

diff --git a/interface/wx/dcmemory.h b/interface/wx/dcmemory.h
index 0d21e5bb0bc585f4a5785a4d13f67f739d1a146e..100fc9beea2025ab36387a0491d8b74eed4771b8 100644 (file)
--- a/interface/wx/dcmemory.h
+++ b/interface/wx/dcmemory.h
@@ -3,7 +3,7 @@
 // Purpose:     interface of wxMemoryDC
 // Author:      wxWidgets team
 // RCS-ID:      $Id$
-// Licence:     wxWindows license
+// Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 
 /**
@@ -55,6 +55,18 @@ public:
         a bitmap into the DC before drawing on it.
     */
     wxMemoryDC();
+
+    /**
+        Constructs a new memory device context having the same characteristics
+        as the given existing device context.
+
+        This constructor creates a memory device context @e compatible with @a
+        dc in wxMSW, the argument is ignored in the other ports. If @a dc is
+        @NULL, a device context compatible with the screen is created, just as
+        with the default constructor.
+     */
+    wxMemoryDC(wxDC *dc);
+
     /**
         Constructs a new memory device context and calls SelectObject() with
         the given bitmap.
@@ -69,13 +81,17 @@ public:
         should use when you select a bitmap because you want to modify it, e.g.
         drawing on this DC.
 
-        Using SelectObjectAsSource() when modifying the bitmap may incurr some
+        Using SelectObjectAsSource() when modifying the bitmap may incur some
         problems related to wxBitmap being a reference counted object (see
         @ref overview_refcount).
 
-        Also, before using the updated bitmap data, make sure to select it out
-        of context first (for example by selecting ::wxNullBitmap into the device
-        context).
+        Before using the updated bitmap data, make sure to select it out of
+        context first either by selecting ::wxNullBitmap into the device
+        context or destroying the device context entirely.
+
+        If the bitmap is already selected in this device context, nothing is
+        done. If it is selected in another context, the function asserts and
+        drawing on the bitmap won't work correctly.
 
         @see wxDC::DrawBitmap()
     */