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/* Allocate X colors. Used for testing with dense colormaps.
Copyright (C) 2001-2021 Free Software Foundation, Inc.
This file is part of GNU Emacs.
GNU Emacs is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or (at
your option) any later version.
GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>. */
#include <X11/Xlib.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <unistd.h>
void
fatal (const char *fmt, ...)
{
va_list ap;
va_start (ap, fmt);
vfprintf (stderr, fmt, ap);
fputc ('\n', stderr);
va_end (ap);
exit (1);
}
void
usage (const char *progname)
{
fprintf (stderr, "Usage %s options\n", progname);
fprintf (stderr, "-n NCOLORS allocate NCOLORS colors\n");
exit (1);
}
int
main (int argc, char **argv)
{
Display *dpy;
int opt, ncolors = 0, i;
XColor *allocated;
int nallocated;
XColor color;
Colormap cmap;
while ((opt = getopt (argc, argv, "n:")) != EOF)
switch (opt)
{
case 'n':
ncolors = atoi (optarg);
break;
case '?':
usage (argv[0]);
}
if (ncolors == 0)
usage (argv[0]);
dpy = XOpenDisplay ("");
if (dpy == NULL)
fatal ("Cannot open display");
cmap = DefaultColormap (dpy, 0);
allocated = malloc (ncolors * sizeof *allocated);
nallocated = 0;
memset (&color, 0, sizeof color);
while (nallocated < ncolors
&& color.red < 65536)
{
allocated[nallocated] = color;
if (XAllocColor (dpy, cmap, &allocated[nallocated]))
{
for (i = 0; i < nallocated; ++i)
if (allocated[i].red == allocated[nallocated].red
&& allocated[i].green == allocated[nallocated].green
&& allocated[i].blue == allocated[nallocated].blue)
break;
if (i == nallocated)
{
printf ("allocated %d/%d/%d\n",
allocated[nallocated].red,
allocated[nallocated].green,
allocated[nallocated].blue);
++nallocated;
}
}
++color.red;
++color.green;
++color.blue;
}
fprintf (stderr, "Waiting. Press ^C to stop.\n");
while (1)
sleep (10);
XCloseDisplay (dpy);
return 0;
}
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