Understanding Cocoa’s Role in Mac OS X
Mac OS X traces its heritage to earlier Mac operating systems and to versions of Unix. Mac OS X melds the two operating systems into one.
Mac OS X uses the layered architecture shown in Figure 1.1. Cocoa is implemented to enable access to all the features of OS X. Cocoa applications can use the Quartz, OpenGL, and QuickTime graphics systems supported by Mac OS X. Cocoa provides high-level, object-oriented components that use Quartz and advanced font rendering capabilities built on top of Quartz. Cocoa objects exist to access OpenGL and QuickTime. Traditional Mac features are accessed through objects that internally use the Carbon API. Cocoa directly uses features provided by Darwin.
Figure 1.1. Mac OS ...
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