On 05/03/14 19:45, Adam Jackson wrote:
On Thu, 2014-02-27 at 15:46 +0100, Michael Thayer wrote:
Another would be
to add a return value to the DDX CRTC functions "load_cursor_argb", so
that if the KMS driver failed to set the cursor, "modesetting" could
pass this on to the X server.
Actually we really should make load_cursor_argb return something other
than void. Some particularly incapable server GPUs have format
restrictions on their hardware cursors that mean _some_ ARGB cursors
could be made to work but not all; and right now, the fallback code in
-modesetting doesn't get this case right, and you end up with no cursor
at all.
I have been looking at what this would take, and what rather puts me off
is that it would mean patching all supported video drivers without even
the means to test them (the patches will be mostly be adding "return
TRUE" in the right place of course, but you know how it is; how is this
sort of thing normally handled?)
Thinking a bit more, what would be ideal for me would be a way of
telling the X server to use or not to use the hardware cursor of a
particular card. A RandR request might fit the picture here. Is this
something which might be acceptable?
Even nicer would be a way in addition of telling the server that a
particular hardware cursor is linked to a particular input device, and
that it should use a software cursor if it wants the cursor to be
somewhere other than the position reported by the device; I can't
immediately think though where that would fit in cleanly, and neither
can I immediately think of any other potential users of such an interface.
Of course, from my point of view, unlike using the "load_cursor_argb"
API which just would just pass through to the KMS driver, these two
would both be X.Org-only solutions to my problem which won't help
whenever we want to start supporting Wayland.
Regards,
Michael
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