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Filter graphics driver

hello ,
I have to write an application whether user space/kernel space that should filter the rendering that is being done on the screen ,
Now the flow that we understood is Aqua will generate the calls for Quartz and the further Quartz will generate calls for the underlying driver .

Now the point we are unclear about is , what are these interface ie interface for communication between application and quartz and of between quartz and driver .
Mac OS provides standard graphics family which export certain interfaces . Now OS has to generate calls for these interfaces , but these interfaces were never getting hit during the debugging.

When we put break points in graphics kext , the break points were hit . But the functions that were being called for eg allocate_texture() etc t are not there in the standard graphics family.

This led us to conclusion that these may be the private function of graphics kext . But OS doesnt know about the private functions of graphics kext , so how the calls are being routed to graphics kext private function ? How OS standard calls are being mapped to graphics kext private functions ??

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