[Glamor] Question: glamor_copy_fbo_cpu seems to be never called in some cases?

[Luc Ma]

Hello everyone!
I am trying to enable glamor in my experimental project.Under debug mode I
found that glamor_copy_fbo_cpu path is never taken in glamor_copy_gl.
Unfortunately I have not seen any pixels on the screen. I have no idea if
this is the problem. I am doing this on the platform based GBM, so I think
since gbm_bo is both used for RENDERING(renderbuffer) and
SCANOUT(framebuffer), it is not necessary to copy pixels from GPU to CPU,
they are always in the VRAM. Is my understanding correct?
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