[GSoC] Integrate LO with GNOME - WR#7

[Pranav Kant]

Maybe I should consider updating the overlay only after I get the actual tile ?

On Fri, Jul 17, 2015 at 11:50 PM, Pranav Kant <pranav913 at gmail.com> wrote:
> I followed the approach you mentioned.
>
> But the user experience is poor this way. As I am typing things on the
> keyboard the immediate effect is that it places dummy tiles for
> fraction of seconds in place of invalidated tiles. The callback gets
> called when the actual tile gets rendered, and it replaces the dummy
> tile with it.
>
> It was much better initially.
>
> Here[1] is the screencast of what I exactly want to say.
>
> [1] https://pranvk.fedorapeople.org/async.webm
>
> On Thu, Jul 16, 2015 at 1:18 AM, Michael Meeks
> <michael.meeks at collabora.com> wrote:
>> 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.meeks at collabora.com  <><, Pseudo Engineer, itinerant idiot
>>
>
>
>
> --
> Regards,
> Pranav Kant
> http://pranavk.me



-- 
Regards,
Pranav Kant
http://pranavk.me