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backends: fix alpha handling for cairo and macosx - #437
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There are two parts to this change. First, the cairo and macosx backends recycle the graphics context instead of making a new one with the new_gc() method, so the _alpha attribute must be reset to 1 at that point. Second, the GraphicsContextBase.set_foreground() method needs to call the set_alpha method instead of setting the _alpha attribute, so that the subclass method is called.
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Aug 27, 2011
backends: fix alpha handling for cairo and macosx
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There are two parts to this change. First, the cairo
and macosx backends recycle the graphics context instead
of making a new one with the new_gc() method, so the _alpha
attribute must be reset to 1 at that point. Second, the
GraphicsContextBase.set_foreground() method needs to call
the set_alpha method instead of setting the _alpha attribute,
so that the subclass method is called.