Set HBITMAP and its parameters in one call

To avoid separate calls to SetWidth/Height/Size/Depth functions after calling SetHBITMAP() use newly implemented InitFromHBITMAP() function which allows to set HBITMAP together with its parameters in one call.

src/msw/bitmap.cpp

@@ -1290,6 +1290,34 @@ void wxBitmap::SetMask(wxMask *mask)
     GetBitmapData()->SetMask(mask);
 }
 
+bool wxBitmap::InitFromHBITMAP(WXHBITMAP bmp, int width, int height, int depth)
+{
+#if wxDEBUG_LEVEL >= 2
+    if ( bmp != NULL )
+    {
+        BITMAP bm;
+        if ( ::GetObject(bmp, sizeof(bm), &bm) == sizeof(bm) )
+        {
+            wxASSERT_MSG(bm.bmWidth == width && bm.bmHeight == height && bm.bmBitsPixel == depth,
+                         wxS("Inconsistent bitmap parameters"));
+        }
+        else
+        {
+            wxFAIL_MSG(wxS("Cannot retrieve parameters of the bitmap"));
+        }
+    }
+#endif // wxDEBUG_LEVEL >= 2
+
+    AllocExclusive();
+
+    GetBitmapData()->m_handle = (WXHANDLE)bmp;
+    GetBitmapData()->m_width = width;
+    GetBitmapData()->m_height = height;
+    GetBitmapData()->m_depth = depth;
+
+    return IsOk();
+}
+
 // ----------------------------------------------------------------------------
 // raw bitmap access support
 // ----------------------------------------------------------------------------
@@ -1620,9 +1648,7 @@ wxBitmap wxMask::GetBitmap() const
 
     // Create and return a new wxBitmap.
     wxBitmap bmp;
-    bmp.SetHBITMAP((WXHBITMAP)hNewBitmap);
-    bmp.SetSize(bm.bmWidth, bm.bmHeight);
-    bmp.SetDepth(bm.bmBitsPixel);
+    bmp.InitFromHBITMAP((WXHBITMAP)hNewBitmap, bm.bmWidth, bm.bmHeight, bm.bmBitsPixel);
 
     return bmp;
 }