From d5536adedfb59e4a5792234e6a28949535e13369 Mon Sep 17 00:00:00 2001
From: Vadim Zeitlin <vadim@wxwidgets.org>
Date: Wed, 26 Jan 2000 14:08:11 +0000
Subject: [PATCH] wxDC::Blit() ignores useMask if there is no mask instead of
 giving an assert failure

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@5677 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
---
 src/msw/dc.cpp | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/msw/dc.cpp b/src/msw/dc.cpp
index f8c01f727d..0744dc251e 100644
--- a/src/msw/dc.cpp
+++ b/src/msw/dc.cpp
@@ -1255,8 +1255,12 @@ bool wxDC::DoBlit(wxCoord xdest, wxCoord ydest,
         const wxBitmap& bmp = source->m_selectedBitmap;
         mask = bmp.GetMask();
 
-        wxCHECK_MSG( bmp.Ok() && mask && mask->GetMaskBitmap(), FALSE,
-                     _T("can't blit with mask without mask") );
+        if ( !(bmp.Ok() && mask && mask->GetMaskBitmap()) )
+        {
+            // don't give assert here because this would break existing
+            // programs - just silently ignore useMask parameter
+            useMask = FALSE;
+        }
     }
 
     COLORREF old_textground = ::GetTextColor(GetHdc());