+
+PNG Images
+----------
+
+Prior to 2.5 the PNG image handler would convert all alpha channel
+information to a mask when the image was loaded. Pixels that were
+more than halfway transparent would be made fully transparent by the
+mask and the rest would be made fully opaque.
+
+In 2.5 the image handler has been updated to preserve the alpha
+channel and will now only create a mask when all the pixels in the
+image are either fully transparent or fully opaque. In addition, the
+wx.DC.DrawBitmap and wx.DC.Blit methods are able to correctly blend
+the pixels in the image with partially transparent alpha values.
+(Currently only on MSW and Mac, if anybody knows how to do it for GTK
+then please submit a patch!)
+
+If you are using a PNG with an alpha channel but you need to have a
+wx.Mask like you automatically got in 2.4 then you can do one of the
+following:
+
+ * Edit the image and make all the partially transparent pixels be
+ fully transparent.
+
+ * Use a different image type.
+
+ * Set a mask based on colour after you load the image.
+
+
+
+OGL is dead! LONG LIVE OGL!
+---------------------------
+
+**[Changed in 2.5.2.x]**
+
+The wx.ogl module has been deprecated in favor of the new Python port
+of the OGL library located at wx.lib.ogl contributed by Pierre Hjälm.
+This will hopefully greatly extend the life of OGL within wxPython by
+making it more easily maintainable and less prone to getting rusty as
+there seems to be less and less interest in maintaining the C++
+version.
+
+There are only a few known compatibility issues at this time. First
+is the location of OGL. The deprecated version is located in the
+wx.ogl module, and the new version is in the wx.lib.ogl package. So
+this just means that to start using the new version you need to adjust
+your imports. So if your code currently has something like this::
+
+ import wx
+ import wx.ogl as ogl
+
+Then just change it to this::
+
+ import wx
+ import wx.lib.ogl as ogl
+
+The other compatibility issue deals with removing a wart in the
+original API that was necessary in order to allow overloaded methods
+in derived classes to call the same method in the base class when
+using the old SWIG. Instead dedaling with the wart you can now just
+call the base class method like you woudl for any other Python class.
+For example, if you had to do something like this previously::
+
+ class MyDividedShape(ogl.DividedShape):
+ ...
+ def OnSizingEndDragLeft(self, pt, x, y, keys, attch):
+ self.base_OnSizingEndDragLeft(pt, x, y, keys, attch)
+ ...
+
+You will need to change it to be like this::
+
+ class MyDividedShape(ogl.DividedShape):
+ ...
+ def OnSizingEndDragLeft(self, pt, x, y, keys, attch):
+ ogl.DividedShape.OnSizingEndDragLeft(self, pt, x, y, keys, attch)
+ ...
+
+
+
+Obsolete Modules
+----------------