Benjamin M. Schwartz wrote: > da...@lang.hm wrote: >>> It would allow for much improved >>> video performance since you could play back a 320x240 >>> video on the full screen at considerable CPU savings. >> except that you would spend those CPU savings doing the scaling up from >> 320x240 to the higher resolution. > > Argh and double argh! You're both wrong. > > 1. Video playback in any sane player is already routed through XV, which > uses the GPU's video overlay scaler (and YUV->RGB converter). The result > is that playing a 320x240 video at 1200x900 full-screen already costs zero > extra CPU cycles. No need to mess with screen resolution. > > 2. The Geode LX GPU can do both output scaling and video-overlay scaling, > independently, at the same time. On the latest drivers, we should be able > to set the screen resolution to 600x450, scaled up to 1200x900, and then > play a 320x240 video, scaled up to 480x360 (which means 960x720 physical > LCD pixels), all without using any CPU power for scaling. > > There are lots of good reasons to play with screen resolution. My > favorite reason is that reducing the resolution to 800x600 would make all > graphical operations runs twice as fast, and use half as much memory, > while introducing a negligible drop in display quality (the display, > remember, is not _really_ 1200x900 in color mode; the total number of > color elements is equivalent to 800x450).
This last point is what I was hoping for. From other discussions, the X 1.4 driver now has scaling support. What isn't there is a release for the XO that has that driver in it. I realize that since it is open source, I should be able to put this in myself. The reality is that I am too far down on the X11+linux power curve to do this without significant time and effort. My hope is that someone who already knows how this works (e.g. OLPC?) would get this working so I could make use of it for application development and G1G1 usability features such as WINE. --Chris _______________________________________________ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel
