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/*
* Clutter.
*
* An OpenGL based 'interactive canvas' library.
*
* Authored By Matthew Allum <mallum@openedhand.com>
*
* Copyright (C) 2006 OpenedHand
*
* 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.
*/
/**
* SECTION:clutter-util
* @short_description: Misc utility functions.
*
* Various misc utilility functions.
*/
#include "clutter-util.h"
#include "clutter-main.h"
static int TrappedErrorCode = 0;
static int (*old_error_handler) (Display *, XErrorEvent *);
static int
error_handler(Display *xdpy,
XErrorEvent *error)
{
TrappedErrorCode = error->error_code;
return 0;
}
/**
* clutter_util_trap_x_errors:
*
* Trap X errors so they don't cause an abort.
*/
void
clutter_util_trap_x_errors(void)
{
TrappedErrorCode = 0;
old_error_handler = XSetErrorHandler(error_handler);
}
/**
* clutter_util_untrap_x_errors:
*
* Stop trapping X errors.
*
* Return value: 0 if there was no error, or the last X error that occurred.
*/
int
clutter_util_untrap_x_errors(void)
{
XSetErrorHandler(old_error_handler);
return TrappedErrorCode;
}
/**
* clutter_util_next_p2:
* @a: Value to get the next power
*
* Calculates the next power greater than @a.
*
* Return value: The next power after @a.
*/
int
clutter_util_next_p2 (int a)
{
int rval=1;
while(rval < a)
rval <<= 1;
return rval;
}
#if 0
gboolean
clutter_util_can_create_texture (int width, int height)
{
GLint new_width;
glTexImage2D (GL_PROXY_VIDEO_TEXTURE_2D, 0, GL_RGBA,
width, height, 0 /* border */,
GL_RGBA, PIXEL_TYPE, NULL);
glGetTexLevelParameteriv (GL_PROXY_VIDEO_TEXTURE_2D, 0,
GL_VIDEO_TEXTURE_WIDTH, &new_width);
return new_width != 0;
}
#endif
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