> I am using two tools which are packaged for Mageia, so should be > fairly common in most distros; Xephyr and Xdmx - both X-servers. The > difficulty is in getting the magic right for input events. More, as > soon as...
Success. I eventually ran into a bit of a brick wall trying to use Xdmx as the xinerama "harness" for the two Xephyr screens. The only sane way to use it (and it works) is with a dummy console used to track the mouse cursor. Getting the keyboard to work was problematic. In the end I tripped over another way of faking xinerama on a single Xephyr screen. I present to you a short bash script which will start a Xephyr X server with dimensions you choose which will be split (invisibly) into two pseudo-monitors by a specially crafted fake libXinerama (source linked in the bash script) and user-specific ~/.fakexinerama configuration file. I can confirm that this environment will demonstrate the issue with my test-bed project, though you will have to judge for yourself where the second half of the xinerama screen starts:-) I had to tweak the project a tiny bit to try to accommodate the changed screen resolution as I use a form width and height check to tell me if the previous run had crashed - sloppy, yes; sorry? Yes. Quick and dirty, but it'll do, I reckon. Richard
xephyr
Description: Binary data
Window_Position_Bug-0.0.11.tar.gz
Description: GNU Zip compressed data
/* $Xorg: XPanoramiX.c,v 1.4 2000/08/17 19:45:51 cpqbld Exp $ */
/*****************************************************************
Copyright (c) 1991, 1997 Digital Equipment Corporation, Maynard, Massachusetts.
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software.
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
DIGITAL EQUIPMENT CORPORATION BE LIABLE FOR ANY CLAIM, DAMAGES, INCLUDING,
BUT NOT LIMITED TO CONSEQUENTIAL OR INCIDENTAL DAMAGES, OR OTHER LIABILITY,
WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Except as contained in this notice, the name of Digital Equipment Corporation
shall not be used in advertising or otherwise to promote the sale, use or other
dealings in this Software without prior written authorization from Digital
Equipment Corporation.
******************************************************************/
/* $XFree86: xc/lib/Xinerama/Xinerama.c,v 1.2 2001/07/23 17:20:28 dawes Exp $ */
#include <X11/Xlibint.h>
#include <X11/extensions/Xinerama.h>
#include <stdio.h>
static int num_screens = -1;
static struct
{
int x_org, y_org;
int width, height;
} screen_info[ 10 ];
static void skipComments( FILE* f )
{
char tmp[ 4096 ];
for(;;)
{
int c;
for(;;)
{
c = fgetc( f );
if( c == EOF )
return;
if( c != ' ' && c != '\t' && c != '\n' )
break;
}
if( c != '#' )
{
ungetc( c, f );
return;
}
fgets( tmp, 4096, f );
}
}
static void initFakeXinerama()
{
const char* home;
char buf[ 4096 ];
FILE* f;
int i;
if( num_screens != -1 )
return;
num_screens = 0;
home = getenv( "HOME" );
if( home == NULL )
return;
sprintf( buf, "%s/.fakexinerama", home );
f = fopen( buf, "r" );
if( f == NULL )
return;
skipComments( f );
if( fscanf( f, "%d\n", &num_screens ) != 1 )
{
num_screens = 0;
fclose( f );
return;
}
if( num_screens >= 10 )
num_screens = 10;
for( i = 0;
i < num_screens;
++i )
{
skipComments( f );
if( fscanf( f, "%d %d %d %d\n", &screen_info[ i ].x_org, &screen_info[ i ].y_org,
&screen_info[ i ].width, &screen_info[ i ].height ) != 4 )
{
num_screens = 0;
fclose( f );
return;
}
}
fclose( f );
}
Bool XineramaQueryExtension (
Display *dpy,
int *event_base,
int *error_base
)
{
(void) dpy;
*event_base = 0;
*error_base = 0;
return True;
}
Status XineramaQueryVersion(
Display *dpy,
int *major,
int *minor
)
{
(void) dpy;
*major = 1;
*minor = 1;
return 1;
}
Bool XineramaIsActive(Display *dpy)
{
(void) dpy;
initFakeXinerama();
return num_screens != 0;
}
XineramaScreenInfo *
XineramaQueryScreens(
Display *dpy,
int *number
)
{
XineramaScreenInfo *scrnInfo = NULL;
initFakeXinerama();
if(num_screens) {
if((scrnInfo = Xmalloc(sizeof(XineramaScreenInfo) * num_screens))) {
int i;
for(i = 0; i < num_screens; i++) {
scrnInfo[i].screen_number = i;
scrnInfo[i].x_org = screen_info[ i ].x_org;
scrnInfo[i].y_org = screen_info[ i ].y_org;
scrnInfo[i].width = screen_info[ i ].width;
scrnInfo[i].height = screen_info[ i ].height;
}
*number = num_screens;
} else
;
}
return scrnInfo;
}
.fakexinerama
Description: Binary data
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