Mirroring a portion of the screen to an external display (in OSX)

Posted by Adam on Stack Overflow See other posts from Stack Overflow or by Adam
Published on 2010-04-30T17:04:20Z Indexed on 2010/04/30 17:07 UTC
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Filed under:

osx

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display

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mirroring

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quartz-graphics

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core-graphics

I would like to write a program that can mirror a portion of the main display into a new window. Ideally this new window could then be displayed on an external monitor. I have seen this uiltity for a flightsim that does this on a pc (a multifunction display extractor).

MFDex http://trac2.assembla.com/lightnings..._x86_Setup.msi

I have looked at screen magnifiers or vnc clients for ideas but I think I need to write something from scratch. I have tried to do some reading on osx programing but where do I start in terms of gaining access to the display? I somehow need to extract the graphics from a particular program. Is it best to go near the final output stage (the individual pixels sent to the display) or somewhere nearer the window management stage.

Any ideas or pointers would be much appreciated. I just need somewhere to start from.

Regards,

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