Grab frame from blit engine and threads.

I want to grab a frame from the blit engine when it has finished being  
processed. I've noticed in the code that it seems to process a line of  
pixels at a time and the video driver also seems to output a line at a  
time. Does this mean that I would have to set up a buffer that is the  
size of the output frame and then copy each line into it as it is  
processed? Is there also an indication of the pixel format that is sent  
to the video driver?

I was also thinking about how to multithread the blit engine and was  
wondering if it would be possible to divide the screen up into groups  
of lines and have each thread process its lot and write the output into  
a buffer and then the last thread to finish gets to call the video  
output driver?

Michael.

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