[Bug 779146] dmabuf: be able to negotiate tiled surfaces

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=779146

--- Comment #50 from Daniel Stone <daniel at fooishbar.org> ---
> This is just a sample of the possible issues we keep facing.

Also, I would really like to know, quite specifically, what these issues are.
I've tried to guess a few times at what you mean (e.g. by 'the state of
stride') and am still clueless.

If you let me know then either we can fix them, or fix the usage where the
latter is incorrect - for instance, where you say 'If dumb buffer, strides
means bit-per-pixel * width / 8', then as above, this is incorrect because the
driver _returns_ an aligned stride value from the ioctl, along with the handle.
This is somewhat documented in the ioctl:
https://cgit.freedesktop.org/drm/drm-tip/tree/include/uapi/drm/drm_mode.h?h=drm-tip#n667

Can you please enumerate somewhere (it doesn't have to be here), a list of the
problems you see, rather than just saying that the entire graphics stack is
completely and hopelessly broken, as if it were a known issue? :\

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