- if wx.Platform == "__WXGTK__":
- # try to make up for it a bit...
- bmp.SetMaskColour("black")
+ if "gtk1" in wx.PlatformInfo:
+ # Try to make up for lack of alpha support in wxGTK (gtk+
+ # 1.2) by converting the alpha blending into a
+ # transparency mask.
+
+ # first convert to a wx.Image
+ img = bmp.ConvertToImage()
+
+ # Then convert the alpha channel to a mask, specifying the
+ # threshold below which alpha will be made fully
+ # transparent
+ img.ConvertAlphaToMask(220)
+
+ # convert back to a wx.Bitmap
+ bmp = img.ConvertToBitmap()
+