Garrett Moon 01c1680904 Switch to instance methods of draw and display ...

This patch switches to instance methods of draw and display for
ASTextNode and ASImageNode to attempt to increase their performance.

It also fixes some thread safety issues in ASImageNode which appear
to have been regressions (though probably not hit very often).

And it sets up work for allowing modification of CGContexts before
and after a node's contents are drawn.

2016-01-27 20:08:02 -08:00

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