[cairo] Cairo across processes, with TEE ?

Stuart Axon stuaxo2 at yahoo.com
Fri Feb 14 13:37:05 CET 2014

Ah, this is interesting - I will definitely have a look at the SHM option for cross-process drawing.

For recording surfaces + the network:
Does the recording surface save the drawing commands to a buffer that I can then pass across the network, or would I serialise the commands that I was going to feed into a recording surface on the other side of the network ?



On Friday, February 14, 2014 12:27 PM, Krzysztof Kosiński <tweenk.pl at gmail.com> wrote:
2014-02-13 14:46 GMT+01:00 Stuart Axon <stuaxo2 at yahoo.com>:
>> Hi,
>>    I've been playing with zeromq to send drawing commands over between two
>> processes, drawing them with cairo at the end and I noticed the cairo-tee
>> backend - does this do something similar ?
>As far as I can see, cairo-tee works only within a single process.
>To delegate drawing to a different process, I think the easiest way is
>to create a shared memory segment that backs an image surface and
>write to it in one process then read it in the other. You would need
>to ensure that there is no concurrent write access to the surface, and
>call cairo_surface_mark_dirty() after the drawing from the second
>process is finished.
>If you need to do this over a network, you could use the recording
>surface and send the serialized data to a different host for replay.
>Regards, Krzysztof
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