Add RAII AutoIconInfo class wrapping ICONINFO Windows struct.

This ensures that we never forget to delete the handles returned by
GetIconInfo() and also centralizes the error message given if it fails in a
single place.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@78132 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/graphics.cpp

@@ -1736,9 +1736,8 @@ void wxGDIPlusContext::DrawIcon( const wxIcon &icon, wxDouble x, wxDouble y, wxD
     // the built-in conversion fails when there is alpha in the HICON (eg XP style icons), we can only
     // find out by looking at the bitmap data whether there really was alpha in it
     HICON hIcon = (HICON)icon.GetHICON();
-    ICONINFO iconInfo ;
-    // IconInfo creates the bitmaps for color and mask, we must dispose of them after use
-    if (!GetIconInfo(hIcon,&iconInfo))
+    AutoIconInfo iconInfo ;
+    if (!iconInfo.GetFrom(hIcon))
         return;
 
     Bitmap interim(iconInfo.hbmColor,NULL);
@@ -1788,8 +1787,6 @@ void wxGDIPlusContext::DrawIcon( const wxIcon &icon, wxDouble x, wxDouble y, wxD
     m_context->DrawImage(image,(REAL) x,(REAL) y,(REAL) w,(REAL) h) ;
 
     delete image ;
-    DeleteObject(iconInfo.hbmColor);
-    DeleteObject(iconInfo.hbmMask);
 }
 
 void wxGDIPlusContext::DoDrawText(const wxString& str,