A few tweaks and cleanups

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

diff --git a/src/msw/imaglist.cpp b/src/msw/imaglist.cpp
index 5140135aebb0edbfa60d7c9eb6b72d905a83e9e1..46cb341d1252fa74c183098af3fc1d90e148e4b5 100644 (file)
--- a/src/msw/imaglist.cpp
+++ b/src/msw/imaglist.cpp
@@ -315,37 +315,41 @@ bool wxImageList::Draw(int index,
 static HBITMAP GetMaskForImage(const wxBitmap& bitmap, const wxBitmap& mask)
 {
     HBITMAP hbmpMask;
-    wxBitmap *bmpMask = NULL;
+    wxMask *pMask;
+    bool deleteMask = FALSE;
 
     if ( mask.Ok() )
     {
         hbmpMask = GetHbitmapOf(mask);
+        pMask = NULL;
     }
     else
     {
-        wxMask *pMask = bitmap.GetMask();
-        if ( pMask )
+        pMask = bitmap.GetMask();
+        if ( !pMask )
         {
-            hbmpMask = (HBITMAP)pMask->GetMaskBitmap();
-        }
-        else
-        {
-            // create a non transparent mask - apparently, this is needed under
-            // Win9x (it doesn't behave correctly if it's passed 0 mask)
-            bmpMask = new wxBitmap(bitmap.GetWidth(), bitmap.GetHeight(), 1);
+            // use the light grey count as transparent: the trouble here is
+            // that the light grey might have been changed by Windows behind
+            // our back, so use the standard colour map to get its real value
+            wxCOLORMAP *cmap = wxGetStdColourMap();
+            wxColour col;
+            wxRGBToColour(col, cmap[wxSTD_COL_BTNFACE].from);
 
-            wxMemoryDC dcMem;
-            dcMem.SelectObject(*bmpMask);
-            dcMem.Clear();
-            dcMem.SelectObject(wxNullBitmap);
+            pMask = new wxMask(bitmap, col);
 
-            hbmpMask = GetHbitmapOf(*bmpMask);
+            deleteMask = TRUE;
         }
+
+        hbmpMask = (HBITMAP)pMask->GetMaskBitmap();
     }
 
     // windows mask convention is opposite to the wxWindows one
     HBITMAP hbmpMaskInv = wxInvertMask(hbmpMask);
-    delete bmpMask;
+
+    if ( deleteMask )
+    {
+        delete pMask;
+    }
 
     return hbmpMaskInv;
 }