Fix creation of wxBitmap from monochrome wxIcon or wxCursor in wxMSW.

Don't suppose that we always have hbmColor because this is not true for
monochrome icons/cursors. Create our own bitmap in this case.

Closes #16512.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_3_0_BRANCH@77516 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

docs/changes.txt

@@ -607,6 +607,7 @@ wxMSW:
 - Fix appearance of wxToggleButtons with non default colours (Artur Wieczorek).
 - Fix drawing on wxDC when using right-to-left layout (Artur Wieczorek).
 - Fix wxGrid appearance and behaviour in RTL (Artur Wieczorek).
+- Fix creating wxBitmap from monochrome wxIcon or wxCursor (Artur Wieczorek).
 - Add paragraph spacing attributes support to wxTextCtrl (dannchr).
 - Show new style directory selector even for non existent paths (raychow).
 - Fix order of radial gradient stops (Alexandru Pana).

src/msw/bitmap.cpp

@@ -360,11 +360,24 @@ bool wxBitmap::CopyFromIconOrCursor(const wxGDIImage& icon,
     int w = icon.GetWidth(),
         h = icon.GetHeight();
 
-    refData->m_width = w;
-    refData->m_height = h;
-    refData->m_depth = wxDisplayDepth();
-
-    refData->m_hBitmap = (WXHBITMAP)iconInfo.hbmColor;
+    if ( iconInfo.hbmColor )
+    {
+        refData->m_width = w;
+        refData->m_height = h;
+        refData->m_depth = wxDisplayDepth();
+        refData->m_hBitmap = (WXHBITMAP)iconInfo.hbmColor;
+    }
+    else // we only have monochrome icon/cursor
+    {
+        // Then we need to create our own empty bitmap, which will be modified
+        // by the mask below.
+        wxDIB dib(w, h, wxDisplayDepth());
+        if ( dib.IsOk() )
+        {
+            memset(dib.GetData(), 0, wxDIB::GetLineSize(w, dib.GetDepth())*h);
+            refData->AssignDIB(dib);
+        }
+    }
 
     switch ( transp )
     {