I wrote a routine to downsample from 32bpp to 16bpp a while ago, which I think is pretty fast. http://www.glost.eclipse.co.uk/gfoot/gp2x/ - third link down. There are some other assembly thingls there if you're interested in that kind of thing - mostly trying to write things in as little space as possible. It's all six months old though, nothing new for ages I'm afraid.
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