Hi,
On 05/07/2012 09:03 AM, Gerd Hoffmann wrote:
Hi,
1. Guest enables a new monitor:
2. Guest pushes QXLHead command to command ring
3. Server sends SpiceHead message on the ring's display channel.
4. Client creates a window out of [x, y, width, height] scanning out of the primary surface (there is one associated primary with the display channel)
Iziks original idea for that one was to just use additional surfaces for
the additional heads. QXL_IO_{CREATE,DESTROY}_PRIMARY write an id
because of that, which is forced to be zero right now. IIRC the plan
was to just allow non-zero values for more heads there, so each
display/head has its own primary surface.
AFAIK that won't work because xrandr expects there to be multiple
crtc's which scanout of one framebuffer. Note this also makes things
like moving a window (partially) over a screen boundary much smoother,
since it is still a bitblt to one surface, rather then 2 bitblt's ...
Regards,
Hans
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