/* xscreensaver, Copyright (c) 1992, 1995, 1996, 1997
 *  Jamie Zawinski <jwz@jwz.org>
 *
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, provided that
 * the above copyright notice appear in all copies and that both that
 * copyright notice and this permission notice appear in supporting
 * documentation.  No representations are made about the suitability of this
 * software for any purpose.  It is provided "as is" without express or 
 * implied warranty.
 */

#ifndef __XSCREENSAVER_ALPHA_H__
#define __XSCREENSAVER_ALPHA_H__

extern int allocate_color_planes (Display *dpy, Colormap cmap,
				  int nplanes, unsigned long *plane_masks,
				  unsigned long *base_pixel_ret);

extern void initialize_transparency_colormap (Display *dpy, Colormap cmap,
					      int nplanes,
					      unsigned long base_pixel,
					      unsigned long *plane_masks,
					      XColor *colors,
					      Bool additive_p);

extern Bool allocate_alpha_colors (Display *dpy, Colormap cmap,
				   int *nplanesP, Bool additive_p,
				   unsigned long **plane_masks,
				   unsigned long *base_pixelP);

#endif /* __XSCREENSAVER_ALPHA_H__ */