[cairo] about glitz yv12 support

[ma liang]

Hello,
  I have 3 questions when I use glitz for a yv12 surface.
1. When I use function glitz_glx_find_window_format(), I can't use
GLITZ_FORMAT_FOURCC_MASK to create FOURCC dformat. Does it important?

2. I have created a surface use a GLITZ_FOURCC_YV12 format, is it
means that the surface is a YV12 surface?

3.If it is a YV12 surface, how can I set my "base[0]: y,  base[1]: u,
base[2]: v "data to the surface to display it?