X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/25889d3c43f537fea00a2b7d6df7bd7e63e113f8..b0a6bb75bcd4b5a4873d766a9208ac6376fe8625:/src/msw/dcclient.cpp

diff --git a/src/msw/dcclient.cpp b/src/msw/dcclient.cpp
index bbffc5a65a..46642e078f 100644
--- a/src/msw/dcclient.cpp
+++ b/src/msw/dcclient.cpp
@@ -62,11 +62,9 @@ WX_DEFINE_OBJARRAY(wxArrayDCInfo);
 // macros
 // ----------------------------------------------------------------------------
 
-#if !USE_SHARED_LIBRARY
     IMPLEMENT_DYNAMIC_CLASS(wxWindowDC, wxDC)
     IMPLEMENT_DYNAMIC_CLASS(wxClientDC, wxWindowDC)
     IMPLEMENT_DYNAMIC_CLASS(wxPaintDC, wxWindowDC)
-#endif
 
 // ----------------------------------------------------------------------------
 // global variables
@@ -79,7 +77,7 @@ static PAINTSTRUCT g_paintStruct;
     // created in resopnse to WM_PAINT message - doing this from elsewhere is a
     // common programming error among wxWindows programmers and might lead to
     // very subtle and difficult to debug refresh/repaint bugs.
-    bool g_isPainting = FALSE;
+    int g_isPainting = 0;
 #endif // __WXDEBUG__
 
 // ===========================================================================
@@ -110,7 +108,11 @@ wxWindowDC::~wxWindowDC()
   {
     SelectOldObjects(m_hDC);
 
-    ::ReleaseDC(GetWinHwnd(m_canvas), GetHdc());
+    if ( !::ReleaseDC(GetWinHwnd(m_canvas), GetHdc()) )
+    {
+        wxLogLastError(wxT("ReleaseDC"));
+    }
+
     m_hDC = 0;
   }
 
@@ -131,6 +133,11 @@ wxClientDC::wxClientDC(wxWindow *the_canvas)
   m_canvas = the_canvas;
   m_hDC = (WXHDC) ::GetDC(GetWinHwnd(the_canvas));
 
+  // the background mode is only used for text background
+  // and is set in DrawText() to OPAQUE as required, other-
+  // wise always TRANSPARENT, RR
+  ::SetBkMode( GetHdc(), TRANSPARENT );
+
   SetBackground(wxBrush(m_canvas->GetBackgroundColour(), wxSOLID));
 }
 
@@ -161,7 +168,7 @@ wxClientDC::~wxClientDC()
 //     So we store a list of windows for which we already have the DC and not
 //     just one single hDC. This seems to work, but I'm really not sure about
 //     the usefullness of the whole idea - IMHO it's much better to not call
-//     base class OnPaint() at all, or, if we realyl want to allow it, add a
+//     base class OnPaint() at all, or, if we really want to allow it, add a
 //     "wxPaintDC *" parameter to wxPaintEvent which should be used if it's
 //     !NULL instead of creating a new DC.
 
@@ -175,12 +182,12 @@ wxPaintDC::wxPaintDC()
 
 wxPaintDC::wxPaintDC(wxWindow *canvas)
 {
-    wxCHECK_RET( canvas, "NULL canvas in wxPaintDC ctor" );
+    wxCHECK_RET( canvas, wxT("NULL canvas in wxPaintDC ctor") );
 
 #ifdef __WXDEBUG__
-    if ( !g_isPainting )
+    if ( g_isPainting <= 0 )
     {
-        wxFAIL_MSG( _T("wxPaintDC may be created only in EVT_PAINT handler!") );
+        wxFAIL_MSG( wxT("wxPaintDC may be created only in EVT_PAINT handler!") );
 
         return;
     }
@@ -201,6 +208,11 @@ wxPaintDC::wxPaintDC(wxWindow *canvas)
         ms_cache.Add(new wxPaintDCInfo(m_canvas, this));
     }
 
+    // the background mode is only used for text background
+    // and is set in DrawText() to OPAQUE as required, other-
+    // wise always TRANSPARENT, RR
+    ::SetBkMode( GetHdc(), TRANSPARENT );
+
     SetBackground(wxBrush(m_canvas->GetBackgroundColour(), wxSOLID));
 }
 
@@ -208,18 +220,28 @@ wxPaintDC::~wxPaintDC()
 {
     if ( m_hDC )
     {
+        SelectOldObjects(m_hDC);
+
         size_t index;
         wxPaintDCInfo *info = FindInCache(&index);
 
-        wxCHECK_RET( info, _T("existing DC should have a cache entry") );
+        wxCHECK_RET( info, wxT("existing DC should have a cache entry") );
 
         if ( !--info->count )
         {
             ::EndPaint(GetWinHwnd(m_canvas), &g_paintStruct);
 
             ms_cache.Remove(index);
+
+            // Reduce the number of bogus reports of non-freed memory
+            // at app exit
+            if (ms_cache.IsEmpty())
+                ms_cache.Clear();
         }
         //else: cached DC entry is still in use
+
+        // prevent the base class dtor from ReleaseDC()ing it again
+        m_hDC = 0;
     }
 }
 
@@ -240,3 +262,20 @@ wxPaintDCInfo *wxPaintDC::FindInCache(size_t *index) const
 
     return info;
 }
+
+// find the entry for this DC in the cache (keyed by the window)
+WXHDC wxPaintDC::FindDCInCache(wxWindow* win)
+{
+    wxPaintDCInfo *info = NULL;
+    size_t nCache = ms_cache.GetCount();
+    for ( size_t n = 0; n < nCache; n++ )
+    {
+        info = &ms_cache[n];
+        if ( info->hwnd == win->GetHWND() )
+        {
+            return info->hdc;
+        }
+    }
+    return 0;
+}
+