/* GDK - The GIMP Drawing Kit

 * Copyright (C) 2001-2007 Sun Microsystems, Inc.  All rights reserved.

 * (Brian Cameron, Dmitriy Demin, James Cheng, Padraig O'Briain)

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2 of the License, or (at your option) any later version.

 *

 * This library 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

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with this library; if not, write to the

 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,

 * Boston, MA 02111-1307, USA.

 */

/*

 * Modified by the GTK+ Team and others 1997-2007.  See the AUTHORS

 * file for a list of people on the GTK+ Team.  See the ChangeLog

 * files for a list of changes.  These files are distributed with

 * GTK+ at ftp://ftp.gtk.org/pub/gtk/.

 */

#include "config.h"

#include <stdlib.h>

#include <dlfcn.h>

#ifdef HAVE_STRINGS_H

#include <strings.h>

#endif

#ifdef HAVE_STRING_H

#include <string.h>

#endif

#if defined(HAVE_SYS_SYSTEMINFO_H)

#include <sys/systeminfo.h>

#elif defined(HAVE_SYS_SYSINFO_H)

#include <sys/sysinfo.h>

#endif

#include "gdkmedialib.h"

typedef char *      (*ml_version)         (void);

static ml_version                 medialib_version = mlib_version;

gboolean 

_gdk_use_medialib (void)

{

  char *mlib_version_string;

  char sys_info[257];

  long count;

  /*

   * Sun mediaLib(tm) support.

   *

   *   http://www.sun.com/processors/vis/mlib.html

   *

   */

  if (getenv ("GDK_DISABLE_MEDIALIB"))

    return FALSE;

  /*

   * The imaging functions we want to use were added in mediaLib version 2.

   * So turn off mediaLib support if the user has an older version.

   * mlib_version returns a string in this format:

   *

   * mediaLib:0210:20011101:v8plusa

   * ^^^^^^^^ ^^^^ ^^^^^^^^ ^^^^^^^

   * libname  vers build    ISALIST identifier

   *               date     (in this case sparcv8plus+vis)

   *

   * The first 2 digits of the version are the major version.  The 3rd digit

   * is the minor version, and the 4th digit is the micro version. So the

   * above string corresponds to version 2.1.0.In the following test we only

   * care about the major version.

   */

   mlib_version_string = medialib_version ();

   count = sysinfo (SI_ARCHITECTURE, &sys_info[0], 257);

   if (count != -1)

     {

       if (strcmp (sys_info, "i386") == 0)

         {

           char *mlib_target_isa = &mlib_version_string[23];

           /*

            * For x86 processors mediaLib generic C implementation

            * does not give any performance advantage so disable it.

            */

           if (strncmp (mlib_target_isa, "sse", 3) != 0)

             {

               return FALSE;

             }

           /*

            * For x86 processors use of libumem conflicts with

            * mediaLib, so avoid using it.

            */

           if (dlsym (RTLD_PROBE,   "umem_alloc") != NULL)

             {

               return FALSE;

             }

         }

     }

   else

     {

       /* Failed to get system architecture, disable mediaLib */

       return FALSE;

     }

  return TRUE;

}