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Re: [libvirt] [PATCH v4 0/8] Add support for taking screenshots of domain console

On 05/13/2011 02:56 AM, Daniel P. Berrange wrote:
> On Fri, May 13, 2011 at 10:34:24AM +0200, Michal Prívozník wrote:
>>> Then, screen is calculated as
>>>   Screen  Device  Head
>>>    0      video0  0
>>>    1      video0  1
>>>    2      video1  0
>>>    3      video1  1
>>>    4      video1  2
>>>    5      video1  3
>>> Incidentally an RFE is needed against QEMU, since it can only do screen
>>> dump of the first device :-(
>>> Daniel
>> Yes, that is what I had in my mind when creating this concept.
> Ok, please document that in the API docs for the public API
>> Or would it be better to split screen ID into video # and head #?
> No, I think that's probably overkill, unless anyone can think of
> something we can do with them separated, that we can't do with them
> combined...

Good thing we have the flags argument.  When you have a card that
supports multiple monitors, I could see it being worth capturing a
screenshot of just one monitor, vs. a combined screenshot of both
monitors as a single image.  With the above layout, this could be done as:

virDomainScreenshot(dom, st, 1, 0) - just screen 1 (head 1 of video0)
virDomainScreenshot(dom, st, 1, VIR_DOMAIN_SCREENSHOT_DEVICE) -
composite of all screens on video1 (that is, screens 2-5)

of course, supposing that the hypervisors support combined imaging.

Eric Blake   eblake redhat com    +1-801-349-2682
Libvirt virtualization library http://libvirt.org

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