[haiku-development] Re: Reading the Mouse Cursor and Dirty Screen Rectangles for VNC
- From: looncraz <looncraz@xxxxxxxxxxx>
- To: haiku-development@xxxxxxxxxxxxx
- Date: Thu, 26 Mar 2015 10:46:12 -0500
On 3/26/2015 10:10, Alexander G. M. Smith wrote:
Which reminds me to ask if it would be easy to add a way of getting
the current cursor shape, for use in VNC remote viewing of the screen.
Or a way to force it to use the software cursor. It would also be nice
to have a list of the dirty rectangles for the whole screen. Doable? -
Alex
Yes, both are doable. I'm not certain as to how VNC remote viewing is
handled, but I imagine it uses the RemoteHWInterface in the app_server,
which will not enable the hardware cursor, so will always use a software
cursor.
As for the dirty areas of the screen, the same aforementioned object
contains a CopyBackToFront(BRect) method which is called each time a
draw is performed by an attached DrawingEngine.
Providing access to a collected dirty region is needed for two ongoing
app_server projects, one by Julian Harnath to add layer support to BView
and, of course, compositing.
Creating a full-screen BRegion of changed areas is relatively trivial
for remote viewing since everything occurs through the same
RemoteHWInterface.
The base HWInterface will be getting a couple of methods for tracking
changes made by all attached DrawingEngines. This will be used by
compositing, for certain, and is obviously valuable for remote viewing.
For view layering, though, I'm less certain if this method will work
(since the rules change depending on the render target, and view layers
need to be agnostic in that regard).
Hope this was in any way helpful ;-)
--The loon
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