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Q: 

Quartz2D - Create CGBitmapContext passing NULL to data

Hi, It Seems possible to let Quartz using OpenGL for rendering if it takes care of the memory, so I create a CGBitmapContext passing NULL to data. At the end of drawing process I need a pointer to raw memory where the image is stored but CGBitmapContextGetData return NULL. Does someone have any suggestions?
Thanks. T.

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