How to do on-card buffer copy?

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hi,

I want to copy an area of screen to another place, but it's too slow to copy it to main memory and copy back to the destination of graphic card. So I want to know if it is possible to do an on-card buffer copy without copying back to main memory? I study DGA for one day, and find it cann't do this work. 

Thank you.

ps: I find it's possible with DirectX in windows.

with regards,

Daniel
2005-10-15


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