[Glamor] about glamor Xv support

[bradpitt]

I'm a master student from Peking University. I want to apply for this project, however I have a few questions about it so far. 

1. I haven't any Xv driver implementation in glamor source code. Do I need to add a Xv driver(eg. glamor_video.c) first?
2. The basic goal is to implement colorspace conversions for various YUV formats. You want me to use GPU to transfrom YUV to RGB?
3. Advanced goals. Improved scaling algorithms: I find some ddx drivers do this by calling xf86clipvideohelper, Do you want to use openGL to accelerate it?
4. and the rest: Support for brightness/contrast/saturation/hue adjustments;Support for gamma adjustment;Support for colorspace selection. I think it's quite easy to do it using CPU. And I have done this using hardware other than GPU. I suppose you want me to use GLSL to do it? 

In summary, I need some specific details about your requirement since I'm not quite familiar with glamor project. But I'm involved in developing a ddx driver using GPU through EXA to accelerate 2d render in our lab, so I'm very excited when I see this project, maybe I can learn a lot from it.
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