2007-03-03 03:39:18 -07:00
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.\" Copyright (c) 1991 X Consortium
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.\"
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.\" Permission is hereby granted, free of charge, to any person obtaining a
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.\" copy of this software and associated documentation files (the "Software"),
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.\" to deal in the Software without restriction, including without limitation
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.\" the rights to use, copy, modify, merge, publish, distribute, sublicense,
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.\" and/or sell copies of the Software, and to permit persons to whom the
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.\" Software furnished to do so, subject to the following conditions:
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.\"
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.\" The above copyright notice and this permission notice shall be included in
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.\" all copies or substantial portions of the Software.
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.\"
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.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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.\" IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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.\" FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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.\" THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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.\" WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
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.\" OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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.\" SOFTWARE.
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.\"
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.\" Except as contained in this notice, the name of the X Consortium shall not
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.\" be used in advertising or otherwise to promote the sale, use or other
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.\" dealing in this Software without prior written authorization from the
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.\" X Consortium.
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.\"
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.\" Copyright 2006 Sun Microsystems, Inc. All Rights Reserved
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.\"
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.\" Permission is hereby granted, free of charge, to any person obtaining a
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.\" copy of this software and associated documentation files (the "Software"),
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.\" to deal in the Software without restriction, including without limitation
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.\" the rights to use, copy, modify, merge, publish, distribute,
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.\" sublicense, and/or sell copies of the Software, and to permit persons
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.\" to whom the Software is furnished to do so, subject to the following
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.\" conditions:
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.\"
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.\" The above copyright notice and this permission notice shall be
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.\" included in all copies or substantial portions of the Software.
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.\"
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.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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.\" EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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.\" IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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.\" DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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.\" OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR
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.\" THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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.\"
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.\" Except as contained in this notice, the names of the copyright holders
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.\" shall not be used in advertising or otherwise to promote the sale, use
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.\" or other dealings in this Software without prior written authorization
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.\" from said copyright holders.
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.\"
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.\" X Window System is a trademark of The Open Group.
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.\"
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.de ZN
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.ie t \fB\^\\$1\^\fR\\$2
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.el \fI\^\\$1\^\fP\\$2
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..
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.TH XShm __libmansuffix__ __xorgversion__ "X FUNCTIONS"
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.SH NAME
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XShmQueryExtension, XShmQueryVersion, XShmPixmapFormat, XShmAttach, XShmDetach
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XShmCreateImage, XShmPutImage, XShmGetImage, XShmCreatePixmap, XShmGetEventBase - X Shared Memory extension functions
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.SH SYNTAX
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.nf
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.LP
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\&#include <X11/Xlib.h>
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\&#include <sys/ipc.h>
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\&#include <sys/shm.h>
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\&#include <X11/extensions/XShm.h>
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.LP
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Bool XShmQueryExtension(
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Display *display);
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.LP
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Bool XShmQueryVersion(
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Display *display;
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int *major, *minor;
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Bool *pixmaps);
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.LP
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Status XShmPixmapFormat(
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Display *display);
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.LP
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Status XShmAttach(
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Display *display;
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XShmSegmentInfo *shminfo);
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.LP
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Status XShmDetach(
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Display *display;
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XShmSegmentInfo *shminfo);
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.LP
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XImage *XShmCreateImage (
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Display *display;
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Visual *visual;
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unsigned int depth, width, height;
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int format;
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char *data;
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XShmSegmentInfo *shminfo);
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.LP
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Status XShmPutImage(
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Display *display;
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Drawable d;
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GC gc;
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XImage *image;
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int src_x, src_y, dest_x, dest_y;
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unsigned int width, height;
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bool send_event);
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.LP
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Status XShmGetImage (
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Display *display;
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Drawable d;
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XImage *image;
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int x, y;
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unsigned long plane_mask);
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.LP
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Pixmap XShmCreatePixmap(
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Display *display;
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Drawable d;
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char *data;
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XShmSegmentInfo *shminfo;
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unsigned int width, height, depth);
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.LP
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Status XShmGetEventBase(
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Display *display);
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.LP
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.fi
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.SH STRUCTURES
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.nf
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.ta 3i
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\fIEvents:\fP
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typedef struct {
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int type; /\&* of event */
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unsigned long serial; /\&* # of last request processed by server*/
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Bool send_event; /\&* true if this came from a SendEvent request*/
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Display *display; /\&* Display the event was read from */
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Drawable drawable; /\&* drawable of request */
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int major_code; /\&* ShmReqCode */
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int minor_code; /\&* X_ShmPutImage */
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ShmSeg shmseg; /\&* the ShmSeg used in the request*/
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unsigned long offset; /\&* the offset into ShmSeg used in the request*/
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} XShmCompletionEvent;
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.LP
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\fIa structure of type XShmSegmentInfo :\fP
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typedef struct {
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ShmSeg shmseg; /\&* resource id */
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int shmid; /\&* kernel id */
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char *shmaddr; /\&* address in client */
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Bool readOnly; /\&* how the server should attach it */
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} XShmSegmentInfo;
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.SH DESCRIPTION
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.PP
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.PP
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.ZN XShmQueryExtension
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checks to see if the shared memory extensions are available for the
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specified display.
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.PP
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.ZN XShmQueryVersion
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returns the version numbers of the extension implementation. Shared
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memory pixmaps are supported if the pixmaps argument returns true.
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.PP
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.ZN XShmAttach
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tells the server to attach to your shared memory segment. If all goes
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well, you will get a non-zero status, back and your XImage is ready
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for use.
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.PP
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.ZN XShmDetach
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tells the server to detach from your shared memory segment.
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.PP
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.ZN XShmPutImage
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combines an image in memory with a shape of the specified drawable. If
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XYBitmap format is used, the depth must be one, or a ``BadMatch''
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error results. The foreground pixel in the GC defines the source for
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the one bits in the image, and the background pixel defines the source
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for the zero bits. For XYPixmap and ZPixmap, the depth must match the
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depth of the drawable, or a ``BadMatch'' error results.
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.PP
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.ZN XShmGetImage
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reads image data into a shared memory XImage where display is the
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display of interest, drawable is the source drawable, image is the
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destination XImage, x and y are offsets within the drawable, and
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plane_mask defines which planes are to be read.
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.PP
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.ZN XShmCreateImage
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allocates the memory needed for an XImage structure for the specified
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display but does not allocate space for the image itself.
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.PP
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.ZN XShmPixmapFormat
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gets the format for the server. If your application can deal with the
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server pixmap data format, a shared memory segment and shminfo
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structure are created.
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.PP
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.ZN XShmCreatePixmap
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points to a pixmap which you can manipulate in all of the usual ways,
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with the added bonus of being able to edit its contents directly
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through the shared memory segment.
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.PP
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.ZN XShmGetEventBase
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gets the completion event value.
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.PP
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.SH SEE ALSO
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\fIMIT-SHM - The MIT Shared Memory Extension \fP
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