X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/888dde65f43d5f57e8fb2028b27191cca1741403..1665389a9ab7359c164069a31f231f121e4afd8e:/src/msw/dcmemory.cpp

diff --git a/src/msw/dcmemory.cpp b/src/msw/dcmemory.cpp
index 37605f4750..c84983ad85 100644
--- a/src/msw/dcmemory.cpp
+++ b/src/msw/dcmemory.cpp
@@ -40,25 +40,25 @@
 
 IMPLEMENT_ABSTRACT_CLASS(wxMemoryDCImpl, wxMSWDCImpl)
 
-wxMemoryDCImpl::wxMemoryDCImpl( wxMemoryDC *owner ) 
+wxMemoryDCImpl::wxMemoryDCImpl( wxMemoryDC *owner )
         : wxMSWDCImpl( owner )
 {
-    CreateCompatible(NULL); 
-    Init(); 
+    CreateCompatible(NULL);
+    Init();
 }
 
-wxMemoryDCImpl::wxMemoryDCImpl( wxMemoryDC *owner, wxBitmap& bitmap ) 
-        : wxMSWDCImpl( owner ) 
-{ 
-    CreateCompatible(NULL); 
-    Init(); 
+wxMemoryDCImpl::wxMemoryDCImpl( wxMemoryDC *owner, wxBitmap& bitmap )
+        : wxMSWDCImpl( owner )
+{
+    CreateCompatible(NULL);
+    Init();
     DoSelect(bitmap);
 }
 
 wxMemoryDCImpl::wxMemoryDCImpl( wxMemoryDC *owner, wxDC *dc )
-        : wxMSWDCImpl( owner ) 
+        : wxMSWDCImpl( owner )
 {
-    wxCHECK_RET( dc, _T("NULL dc in wxMemoryDC ctor") );
+    wxCHECK_RET( dc, wxT("NULL dc in wxMemoryDC ctor") );
 
     CreateCompatible(dc);
 
@@ -80,9 +80,9 @@ void wxMemoryDCImpl::Init()
 
 bool wxMemoryDCImpl::CreateCompatible(wxDC *dc)
 {
-    wxDCImpl *impl = dc->GetImpl();
+    wxDCImpl *impl = dc ? dc->GetImpl() : NULL ;
     wxMSWDCImpl *msw_impl = wxDynamicCast( impl, wxMSWDCImpl );
-    if (!msw_impl)
+    if ( dc && !msw_impl)
     {
         m_ok = false;
         return false;
@@ -106,16 +106,14 @@ void wxMemoryDCImpl::DoSelect( const wxBitmap& bitmap )
         ::SelectObject(GetHdc(), (HBITMAP) m_oldBitmap);
         if ( m_selectedBitmap.Ok() )
         {
-#ifdef __WXDEBUG__
             m_selectedBitmap.SetSelectedInto(NULL);
-#endif
             m_selectedBitmap = wxNullBitmap;
         }
     }
 
     // check for whether the bitmap is already selected into a device context
     wxASSERT_MSG( !bitmap.GetSelectedInto() ||
-                  (bitmap.GetSelectedInto() == this),
+                  (bitmap.GetSelectedInto() == GetOwner()),
                   wxT("Bitmap is selected in another wxMemoryDC, delete the first wxMemoryDC or use SelectObject(NULL)") );
 
     m_selectedBitmap = bitmap;
@@ -123,9 +121,7 @@ void wxMemoryDCImpl::DoSelect( const wxBitmap& bitmap )
     if ( !hBmp )
         return;
 
-#ifdef __WXDEBUG__
-    m_selectedBitmap.SetSelectedInto(this);
-#endif
+    m_selectedBitmap.SetSelectedInto(GetOwner());
     hBmp = (WXHBITMAP)::SelectObject(GetHdc(), (HBITMAP)hBmp);
 
     if ( !hBmp )