Messages in this thread |  | | Date | Fri, 18 May 2001 11:43:49 -0700 (PDT) | From | James Simmons <> | Subject | Re: problem: reading from (rivafb) framebuffer is really slow |
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> When benchmarking DirectFB, I found that a typical software alpha > blending rectangle fill is completely dominated (I'm talking 90% of the > CPU cycles here) by the time it takes to read pixels from the > framebuffer.
Note the SOFTWARE alpha blending rectangle fill. You are passing alot of data over the bus. So slooooooooow. If you implement a accelerated function you will not have this problem.
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