Hi Pranav,
On Wed, 2015-07-15 at 23:48 +0530, Pranav Kant wrote:
> One important function that I am still not able to call in separate
> thread is drawing the tiles on the screen. The gtk passes the cairo
> contexts whenever 'draw' signal is emitted. The drawing works fine if
> I use this cairo contexts in a synchronous way,
Ho hum =) this is not possible. The Cairo context is (by design) only
live for the scope of the 'draw' signal - this is a feature heavily tied
to double buffering, and the gtk+ rendering infrastructure and it is a
'good thing' (TM) =)
I would recommend instead rendering the tile content asynchronously,
and if we have no tile rendering something else ;-) ( a scaled version
of what was there, or a white background).
LibreOffice can render its tiles asynchronously rather nicely - and
when they show up - just call the gtk+ equivalent of invalidate:
gtk_widget_queue_draw_area() and in a few microseconds you should get
the callback with the cairo context that you want =)
Hope that helps ! =)
ATB,
Michael.
--
michael.me...@collabora.com <><, Pseudo Engineer, itinerant idiot
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