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emacs / admin / alloc-colors.c

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/* Allocate X colors.  Used for testing with dense colormaps.
   Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007
     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 2, 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; see the file COPYING.  If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA.  */

#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  allcoate 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;
}

/* arch-tag: f1be90ac-5b70-43c2-835e-5a6432a25145
   (do not change this comment) */