Re: speed of qt terminal

[Tatsuro M. <tma...@ya...>]

----- Original Message -----

> From: sfeam 
> To: gnuplot-betaTatsuro MATSUOKA 
> Cc: 
> Date: 2015/6/27, Sat 00:25
> Subject: Re: speed of qt terminal
> 
> On Friday, 26 June 2015 04:56:26 PM Tatsuro MATSUOKA wrote:
>>  In octave-maintainers ML, the tread "gnuplot graphics toolkit 
> bugs" is open.
>> 
> http://octave.1599824.n4.nabble.com/gnuplot-graphics-toolkit-bugs-td4671157.html
>> 
>> 
>>  In the discussion there is a statement.(by Daniel J Sebald)
>> 
>> 
> ***************************************************************************************
>>  >    It is now the fastest and most full-featured interactive terminal 
> option. (for qt) 
>> 
>>  except the speed.  Perhaps there is some hardware in which Qt can use, 
>>  say, OpenGL directly, but on my system that isn't the case.  Qt 
> terminal 
>>  is drastically slower. 
>> 
> ***************************************************************************************
>> 
>> 
>>  I have built windows version of gnuplot 5.0 and 5.1 with qt terminal.
>>  For my PC "all.dem" speed of windows, wxt, qt terminals, the qt 
> terminal is fastest.
>> 
>>  Qt development toolkits (Qt 5.3) for gnuplot for windows build are prepared 
> from source
>>  with configure option "-no-opengl".
>> 
>>  To my understanding, gnuplot does not use opengl. Am I right?
> 
> The Qt libraries can use opengl if it is available at run time.
> For some versions of Qt this can be controlled using the environmental
> variable QT_GRAPHICSSYSTEM. I think the default is "native" rather 
> than
> "opengl", which tells the library to use whatever output layer is
> expected to be fastest.
> 
>     Ethan
> 
Thank you for the information. 

Tatsuro