Re: [Qemu-devel] console muti-head some more design input

[Dave Airlie]

On Wed, Nov 20, 2013 at 3:17 PM, Dave Airlie <address@hidden> wrote:
>>> Have a look the virtio-gpu branch in my repo (don't look at the
>>> history, its ugly, just the final state), you'll see code in sdl2.c to
>>> do input translation from window coordinates to the overall screen
>>> space. So we need at least the x,y offset in the ui code, and I think
>>> we need to communicate that via the console.
>>>
>>
>> One of the patches I will be submitting as part of this includes 
>> bi-directional calls to set the orientation. A HwOp, and a 
>> DisplayChangeListenerOp. This allows you to move the display orientation 
>> around in the guest (if your driver and backend support it), or to move the 
>> orientation around by dragging windows... Either way you have the data you 
>> need to get absolute coordinates right, even if you are scaling the guest 
>> display in your windows. Whether the orientation offsets end up stored in 
>> the QemuConsole or not becomes an implementation detail if you get 
>> notifications.
>
> Okay I just hacked up something similar with the bidirectional ops,
> and ran into the fact that DisplayChangeListeners are stored per
> DisplayState, so when my GPU drivers tries to callback for console
> number 1, the dcls for both consoles gets called, this doesn't seem so
> optimal.

Actually ignore that, I didn't cut-n-paste properly :-)

Dave.