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new features to QuickDraw was extremely difficult due to lack of data hiding in the API. The central data structure in QuickDraw was the GrafPort, a structure with all of the member variables exposed. Worse, the GrafPort structure was designed to be directly embedded in third-party developer data structures, so Apple could not add new variables. Color QuickDraw, introduced in 1987, was a tremendous kludge on top of the original black and white QuickDraw. This increased the complexity of developing color applications for Macs. For example, QuickDraw

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