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Filter the drawing contents

Hello,
I want to develop a filter that can filter all the drawing calls ie all of the drawing calls that are being gnerated should go through our filter.
While I was going through the Quartz help I figured out functions like CopyBits etc that are drawing functions.

What I have assumed is that drawing calls that are generated by the application , will call some of the APIs of quartz library. So we can trap those calls and filter the contents of the buffer and further pass the buffer to the lower layer. eg If I can trap the call of CopyBits that is generated from OS , modify the source buffer which is one of the parameter and then further pass the call further on ...
Whether the above task is possible. IF yes then where to place our filter. Any sample code etc can help us .

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