X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/3754c85628ecbf760df3aff2615cbf7c4e8bcf03..180b5b4827d08f1ac13bbb5eca03f775ab35a0b1:/src/common/dcbufcmn.cpp

diff --git a/src/common/dcbufcmn.cpp b/src/common/dcbufcmn.cpp
index 70a7c8b976..b38b4f1f67 100644
--- a/src/common/dcbufcmn.cpp
+++ b/src/common/dcbufcmn.cpp
@@ -48,6 +48,9 @@ public:
 
     static wxBitmap* GetBuffer(int w, int h)
     {
+        if ( ms_usingSharedBuffer )
+            return new wxBitmap(w, h);
+
         if ( !ms_buffer ||
                 w > ms_buffer->GetWidth() ||
                     h > ms_buffer->GetHeight() )
@@ -56,17 +59,32 @@ public:
             ms_buffer = new wxBitmap(w, h);
         }
 
-        // return a copy of the static instance
+        ms_usingSharedBuffer = true;
         return ms_buffer;
     }
 
+    static void ReleaseBuffer(wxBitmap* buffer)
+    {
+        if ( buffer == ms_buffer )
+        {
+            wxASSERT_MSG( ms_usingSharedBuffer, wxT("shared buffer already released") );
+            ms_usingSharedBuffer = false;
+        }
+        else
+        {
+            delete buffer;
+        }
+    }
+
 private:
     static wxBitmap *ms_buffer;
+    static bool ms_usingSharedBuffer;
 
     DECLARE_DYNAMIC_CLASS(wxSharedDCBufferManager)
 };
 
 wxBitmap* wxSharedDCBufferManager::ms_buffer = NULL;
+bool wxSharedDCBufferManager::ms_usingSharedBuffer = false;
 
 IMPLEMENT_DYNAMIC_CLASS(wxSharedDCBufferManager, wxModule)
 
@@ -82,8 +100,27 @@ void wxBufferedDC::UseBuffer(wxCoord w, wxCoord h)
             m_dc->GetSize(&w, &h);
 
         m_buffer = wxSharedDCBufferManager::GetBuffer(w, h);
+        m_style |= wxBUFFER_USES_SHARED_BUFFER;
     }
 
     SelectObject(*m_buffer);
 }
 
+void wxBufferedDC::UnMask()
+{
+    wxCHECK_RET( m_dc, _T("no underlying wxDC?") );
+    wxASSERT_MSG( m_buffer && m_buffer->IsOk(), _T("invalid backing store") );
+
+    wxCoord x = 0,
+            y = 0;
+
+    if ( m_style & wxBUFFER_CLIENT_AREA )
+        GetDeviceOrigin(&x, &y);
+
+    m_dc->Blit(0, 0, m_buffer->GetWidth(), m_buffer->GetHeight(),
+               this, -x, -y );
+    m_dc = NULL;
+
+    if ( m_style & wxBUFFER_USES_SHARED_BUFFER )
+        wxSharedDCBufferManager::ReleaseBuffer(m_buffer);
+}