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+.\" Copyright (c) 1991 X Consortium
+.\"
+.\" Permission is hereby granted, free of charge, to any person obtaining a
+.\" copy of this software and associated documentation files (the "Software"),
+.\" to deal in the Software without restriction, including without limitation
+.\" the rights to use, copy, modify, merge, publish, distribute, sublicense,
+.\" and/or sell copies of the Software, and to permit persons to whom the
+.\" Software furnished to do so, subject to the following conditions:
+.\"
+.\" The above copyright notice and this permission notice shall be included in
+.\" all copies or substantial portions of the Software.
+.\"
+.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+.\" IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+.\" FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+.\" THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+.\" WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
+.\" OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+.\" SOFTWARE.
+.\"
+.\" Except as contained in this notice, the name of the X Consortium shall not
+.\" be used in advertising or otherwise to promote the sale, use or other
+.\" dealing in this Software without prior written authorization from the
+.\" X Consortium.
+.\"
+.\" Copyright 2006 Sun Microsystems, Inc. All Rights Reserved
+.\"
+.\" Permission is hereby granted, free of charge, to any person obtaining a
+.\" copy of this software and associated documentation files (the "Software"),
+.\" to deal in the Software without restriction, including without limitation
+.\" the rights to use, copy, modify, merge, publish, distribute,
+.\" sublicense, and/or sell copies of the Software, and to permit persons
+.\" to whom the Software is furnished to do so, subject to the following
+.\" conditions:
+.\"
+.\" The above copyright notice and this permission notice shall be
+.\" included in all copies or substantial portions of the Software.
+.\"
+.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+.\" EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+.\" IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+.\" DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+.\" OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR
+.\" THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+.\"
+.\" Except as contained in this notice, the names of the copyright holders
+.\" shall not be used in advertising or otherwise to promote the sale, use
+.\" or other dealings in this Software without prior written authorization
+.\" from said copyright holders.
+.\"
+.\" X Window System is a trademark of The Open Group.
+.\"
+.de ZN
+.ie t \fB\^\\$1\^\fR\\$2
+.el \fI\^\\$1\^\fP\\$2
+..
+.TH XShm __libmansuffix__ __xorgversion__ "X FUNCTIONS"
+.SH NAME
+XShmQueryExtension, XShmQueryVersion, XShmPixmapFormat, XShmAttach, XShmDetach
+XShmCreateImage, XShmPutImage, XShmGetImage, XShmCreatePixmap, XShmGetEventBase - X Shared Memory extension functions
+.SH SYNTAX
+.nf
+.LP
+\&#include <X11/Xlib.h>
+\&#include <sys/ipc.h>
+\&#include <sys/shm.h>
+\&#include <X11/extensions/XShm.h>
+.LP
+Bool XShmQueryExtension(
+ Display *display);
+.LP
+Bool XShmQueryVersion(
+ Display *display;
+ int *major, *minor;
+ Bool *pixmaps);
+.LP
+Status XShmPixmapFormat(
+ Display *display);
+.LP
+Status XShmAttach(
+ Display *display;
+ XShmSegmentInfo *shminfo);
+.LP
+Status XShmDetach(
+ Display *display;
+ XShmSegmentInfo *shminfo);
+
+.LP
+XImage *XShmCreateImage (
+ Display *display;
+ Visual *visual;
+ unsigned int depth;
+ int format;
+ char *data;
+ XShmSegmentInfo *shminfo;
+ unsigned int width, height);
+.LP
+Status XShmPutImage(
+ Display *display;
+ Drawable d;
+ GC gc;
+ XImage *image;
+ int src_x, src_y, dest_x, dest_y;
+ unsigned int width, height;
+ bool send_event);
+.LP
+Status XShmGetImage (
+ Display *display;
+ Drawable d;
+ XImage *image;
+ int x, y;
+ unsigned long plane_mask);
+.LP
+Pixmap XShmCreatePixmap(
+ Display *display;
+ Drawable d;
+ char *data;
+ XShmSegmentInfo *shminfo;
+ unsigned int width, height, depth);
+.LP
+Status XShmGetEventBase(
+ Display *display);
+.LP
+
+.fi
+.SH STRUCTURES
+.nf
+.ta 3i
+\fIEvents:\fP
+typedef struct {
+ int type; /\&* of event */
+ unsigned long serial; /\&* # of last request processed by server*/
+ Bool send_event; /\&* true if this came from a SendEvent request*/
+ Display *display; /\&* Display the event was read from */
+ Drawable drawable; /\&* drawable of request */
+ int major_code; /\&* ShmReqCode */
+ int minor_code; /\&* X_ShmPutImage */
+ ShmSeg shmseg; /\&* the ShmSeg used in the request*/
+ unsigned long offset; /\&* the offset into ShmSeg used in the request*/
+} XShmCompletionEvent;
+.LP
+\fIa structure of type XShmSegmentInfo :\fP
+
+typedef struct {
+ ShmSeg shmseg; /\&* resource id */
+ int shmid; /\&* kernel id */
+ char *shmaddr; /\&* address in client */
+ Bool readOnly; /\&* how the server should attach it */
+} XShmSegmentInfo;
+
+.SH DESCRIPTION
+.PP
+.PP
+.ZN XShmQueryExtension
+checks to see if the shared memory extensions are available for the
+specified display.
+.PP
+.ZN XShmQueryVersion
+returns the version numbers of the extension implementation. Shared
+memory pixmaps are supported if the pixmaps argument returns true.
+.PP
+.ZN XShmAttach
+tells the server to attach to your shared memory segment. If all goes
+well, you will get a non-zero status, back and your XImage is ready
+for use.
+.PP
+.ZN XShmDetach
+tells the server to detach from your shared memory segment.
+.PP
+.ZN XShmPutImage
+combines an image in memory with a shape of the specified drawable. If
+XYBitmap format is used, the depth must be one, or a ``BadMatch''
+error results. The foreground pixel in the GC defines the source for
+the one bits in the image, and the background pixel defines the source
+for the zero bits. For XYPixmap and ZPixmap, the depth must match the
+depth of the drawable, or a ``BadMatch'' error results.
+.PP
+.ZN XShmGetImage
+reads image data into a shared memory XImage where display is the
+display of interest, drawable is the source drawable, image is the
+destination XImage, x and y are offsets within the drawable, and
+plane_mask defines which planes are to be read.
+.PP
+.ZN XShmCreateImage
+allocates the memory needed for an XImage structure for the specified
+display but does not allocate space for the image itself.
+.PP
+.ZN XShmPixmapFormat
+gets the format for the server. If your application can deal with the
+server pixmap data format, a shared memory segment and shminfo
+structure are created.
+.PP
+.ZN XShmCreatePixmap
+points to a pixmap which you can manipulate in all of the usual ways,
+with the added bonus of being able to edit its contents directly
+through the shared memory segment.
+.PP
+.ZN XShmGetEventBase
+gets the completion event value.
+.PP
+.SH SEE ALSO
+\fIMIT-SHM - The MIT Shared Memory Extension \fP