added xpmdecod.cpp

[wxWidgets.git] / src / msw / dc.cpp

diff --git a/src/msw/dc.cpp b/src/msw/dc.cpp
index 90433d392f8ed5887b35c637dbe6e8ae6239866b..86e1a772cf018899a575d3be305a9a98db7bc6f2 100644 (file)
--- a/src/msw/dc.cpp
+++ b/src/msw/dc.cpp
@@ -183,23 +183,34 @@ wxDC::wxDC()
 
     m_windowExtX = VIEWPORT_EXTENT;
     m_windowExtY = VIEWPORT_EXTENT;
-
-    m_hDCCount = 0;
 }
 
 
 wxDC::~wxDC()
 {
-    if ( m_hDC != 0 ) {
+    if ( m_hDC != 0 )
+    {
         SelectOldObjects(m_hDC);
-        if ( m_bOwnsDC ) {
-            if ( m_canvas == NULL )
-                ::DeleteDC(GetHdc());
+
+        // if we own the HDC, we delete it, otherwise we just release it
+
+        if ( m_bOwnsDC )
+        {
+            ::DeleteDC(GetHdc());
+        }
+        else // we don't own our HDC
+        {
+            if (m_canvas)
+            {
+                ::ReleaseDC(GetHwndOf(m_canvas), GetHdc());
+            }
             else
-                ::ReleaseDC((HWND)m_canvas->GetHWND(), GetHdc());
+            {
+                // Must have been a wxScreenDC
+                ::ReleaseDC((HWND) NULL, GetHdc());
+            }
         }
     }
-
 }
 
 // This will select current objects out of the DC,
@@ -1202,22 +1213,35 @@ wxCoord wxDC::GetCharWidth() const
 
 void wxDC::DoGetTextExtent(const wxString& string, wxCoord *x, wxCoord *y,
                            wxCoord *descent, wxCoord *externalLeading,
-                           wxFont *theFont) const
+                           wxFont *font) const
 {
-    wxFont *fontToUse = (wxFont*) theFont;
-    if (!fontToUse)
-        fontToUse = (wxFont*) &m_font;
+    HFONT hfontOld;
+    if ( font )
+    {
+        wxASSERT_MSG( font->Ok(), _T("invalid font in wxDC::GetTextExtent") );
+
+        hfontOld = (HFONT)::SelectObject(GetHdc(), GetHfontOf(*font));
+    }
+    else // don't change the font
+    {
+        hfontOld = 0;
+    }
 
     SIZE sizeRect;
     TEXTMETRIC tm;
 
-    GetTextExtentPoint(GetHdc(), WXSTRINGCAST string, wxStrlen(WXSTRINGCAST string), &sizeRect);
+    GetTextExtentPoint(GetHdc(), string, string.length(), &sizeRect);
     GetTextMetrics(GetHdc(), &tm);
 
     if (x) *x = XDEV2LOGREL(sizeRect.cx);
     if (y) *y = YDEV2LOGREL(sizeRect.cy);
     if (descent) *descent = tm.tmDescent;
     if (externalLeading) *externalLeading = tm.tmExternalLeading;
+
+    if ( hfontOld )
+    {
+        ::SelectObject(GetHdc(), hfontOld);
+    }
 }
 
 void wxDC::SetMapMode(int mode)