On Mon, 21 Mar 2011 11:53:52 +1000 Alexander Klenin <[email protected]> wrote:
> On Mon, Mar 21, 2011 at 08:41, Mattias Gaertner > <[email protected]> wrote: > > On Mon, 21 Mar 2011 04:58:18 +1000 > > Alexander Klenin <[email protected]> wrote: > >> Hm. For me GUI means "graphical user interface" -- that is, windows (aka > >> forms), > >> interacting with mouse, etc. > >> I have just committed a demo which does not have any of this, > >> and yet successfully draws TChart to a file -- see previous mail. > >> Maybe for you GUI means a different thing? > > > > Yes. The GUI of the screen. > > By accessing the LCL canvas you access the widgetset (gtk2) which > > accesses the current screen. For example the gtk2 asks for > > theme, fonts, screen color depths and sub pixel rendering parameters. > > A cgi program has no screen. > > It is ok to ask for all these things since thay are necessary to > render the chart. > However, the fact they are unconditionally taken from the screen is IMO > a deficiency of either GTK or LCL-GTK. The display error comes from the gtk. > As you can see in this thread, as soon as this deficiency is worked around, > (in this case, by using Xvfb utility), the problem is solved. I wonder how much overhead it is for a cgi program to start gtk on xvfb compared to a fpcanvas program. Mattias -- _______________________________________________ Lazarus mailing list [email protected] http://lists.lazarus.freepascal.org/mailman/listinfo/lazarus
