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List:       kde-panel-devel
Subject:    Re: [Panel-devel] Latest changes screwed Xinerama setups
From:       "Aaron J. Seigo" <aseigo () kde ! org>
Date:       2007-10-31 17:25:26
Message-ID: 200710311125.29999.aseigo () kde ! org
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On Wednesday 31 October 2007, Lukas Appelhans wrote:
> you have xinerama
> .. xinerama is active
> .. number of screens from XineramaQueryScreens is 2
> .. number of screens from ScreenCount is 1
>
> > > > is your Qt compiled with Xinerama support?
>
> That could it perhaps be, don't know, I changed from qt-copy to Qt 4.3.2
> from Arch-repo... don't know I will test...

ok, so XineramaQueryScreen is working, but ScreenCount isn't. that tells me 
that your Qt is almost certainly compiled without xinerama support. please do 
try qt-copy again and if that fixes it complain loudly to the maintainer of 
that arch package.

oh, btw, there was a slight (though incosequential in your case) bug in the 
last code i attached that i introduced purposefully to test it on my 
non-xinerama machine .. for completeness (and in case others wish to test) 
i've attached it here.

-- 
Aaron J. Seigo
humru othro a kohnu se
GPG Fingerprint: 8B8B 2209 0C6F 7C47 B1EA  EE75 D6B7 2EB1 A7F1 DB43

KDE core developer sponsored by Trolltech

["test_xin.c" (text/x-csrc)]

#include <stdio.h>

#include <X11/extensions/Xinerama.h>
#include <X11/Xlib.h>

int main(int argc, const char* argv)
{
    Display *display;
    int unused;
    int use_xinerama;
    int screenCount;

    display = XOpenDisplay(":0");
    use_xinerama = (XineramaQueryExtension(display, &unused, &unused) && XineramaIsActive(display));

    if (use_xinerama) {
        printf("you have xinerama\n");
        XineramaQueryScreens(display, &screenCount);

        if (XineramaIsActive(display)) {
            printf(".. xinerama is active\n");
        } else {
            printf(".. xinerama is NOT active\n");
        }

        printf(".. number of screens from XineramaQueryScreens is %i\n", screenCount);
        printf(".. number of screens from ScreenCount is %i\n", ScreenCount(display));
    } else {
        printf("single screen suckah!\n");
    }

    XCloseDisplay(display);
    return 0;
}

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