> Do you think it might be useful to add some mechanism to request > buffers with partial frames/fields? May userspace do in-cache image > transformations this way, What exactly do you have in mind? Ask the driver to copy each tile separately? Way to much system calls IMHO. Ask the driver to output the frames in a tile-based instead a scanline-based format? Will simply not work with some hardware. Philips for example supports DMA scatter at page granularity, which isn't flexible enougth to hand out tiles. bttv probably could do because the risc code approach for DMA is _very_ powerful, but I don't think it is worth the trouble. Gerd -- You can't please everybody. And usually if you _try_ to please everybody, the end result is one big mess. -- Linus Torvalds, 2002-04-20
