/* xscreensaver, Copyright (c) 1993, 1994, 1995, 1996, 1997, 1998, 2001
* by 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.
*/
/* The MIT-SHM (Shared Memory) extension is pretty tricky to use.
This file contains the common boiler-plate for creating a shared
XImage structure, and for making sure that the shared memory segments
get allocated and shut down cleanly.
*/
#ifndef __XSCREENSAVER_XSHM_H__
#define __XSCREENSAVER_XSHM_H__
#ifdef HAVE_XSHM_EXTENSION
# include <sys/ipc.h>
# include <sys/shm.h>
# include <X11/extensions/XShm.h>
#else /* !HAVE_XSHM_EXTENSION */
typedef struct {
int shmid; /* Always -1. */
} dummy_segment_info;
/* In case XShmSegmentInfo */
#undef XShmSegmentInfo
#define XShmSegmentInfo dummy_segment_info
#endif
extern XImage *create_xshm_image (Display *dpy, Visual *visual,
unsigned int depth,
int format, XShmSegmentInfo *shm_info,
unsigned int width, unsigned int height);
extern Bool put_xshm_image (Display *dpy, Drawable d, GC gc, XImage *image,
int src_x, int src_y, int dest_x, int dest_y,
unsigned int width, unsigned int height,
XShmSegmentInfo *shm_info);
extern Bool get_xshm_image (Display *dpy, Drawable d, XImage *image,
int x, int y, unsigned long plane_mask,
XShmSegmentInfo *shm_info);
extern void destroy_xshm_image (Display *dpy, XImage *image,
XShmSegmentInfo *shm_info);
#endif /* __XSCREENSAVER_XSHM_H__ */
