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Diffstat (limited to 'utils/xshm.h')
| -rw-r--r-- | utils/xshm.h | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/utils/xshm.h b/utils/xshm.h new file mode 100644 index 0000000..6159b36 --- /dev/null +++ b/utils/xshm.h @@ -0,0 +1,54 @@ +/* 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__ */ |