diff options
Diffstat (limited to 'libXext/src/XMultibuf.c')
| -rw-r--r-- | libXext/src/XMultibuf.c | 1428 |
1 files changed, 713 insertions, 715 deletions
diff --git a/libXext/src/XMultibuf.c b/libXext/src/XMultibuf.c index edb5fa718..5c9cfc78c 100644 --- a/libXext/src/XMultibuf.c +++ b/libXext/src/XMultibuf.c @@ -1,715 +1,713 @@ -/* - * $Xorg: XMultibuf.c,v 1.6 2001/02/09 02:03:49 xorgcvs Exp $ - * -Copyright 1989, 1998 The Open Group - -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. - -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 -OPEN GROUP 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 Open Group shall not be -used in advertising or otherwise to promote the sale, use or other dealings -in this Software without prior written authorization from The Open Group. - * - * Authors: Jim Fulton, MIT X Consortium - */ -/* $XFree86: xc/lib/Xext/XMultibuf.c,v 1.5 2001/12/14 19:55:00 dawes Exp $ */ - -#define NEED_EVENTS -#define NEED_REPLIES -#ifdef HAVE_CONFIG_H -#include <config.h> -#endif -#include <X11/Xlibint.h> -#include <stdio.h> -#include <X11/extensions/Xext.h> -#include <X11/extensions/extutil.h> -#include <X11/extensions/multibufproto.h> -#include <X11/extensions/multibuf.h> - -static XExtensionInfo _multibuf_info_data; -static XExtensionInfo *multibuf_info = &_multibuf_info_data; -static /* const */ char *multibuf_extension_name = MULTIBUFFER_PROTOCOL_NAME; - -#define MbufCheckExtension(dpy,i,val) \ - XextCheckExtension (dpy, i, multibuf_extension_name, val) -#define MbufSimpleCheckExtension(dpy,i) \ - XextSimpleCheckExtension (dpy, i, multibuf_extension_name) - - -/***************************************************************************** - * * - * private utility routines * - * * - *****************************************************************************/ - -/* - * find_display - locate the display info block - */ -static int close_display(Display *dpy, XExtCodes *codes); -static char *error_string(Display *dpy, int code, XExtCodes *codes, char *buf, int n); -static Bool wire_to_event(Display *dpy, XEvent *libevent, xEvent *netevent); -static Status event_to_wire(Display *dpy, XEvent *libevent, xEvent *netevent); -static /* const */ XExtensionHooks multibuf_extension_hooks = { - NULL, /* create_gc */ - NULL, /* copy_gc */ - NULL, /* flush_gc */ - NULL, /* free_gc */ - NULL, /* create_font */ - NULL, /* free_font */ - close_display, /* close_display */ - wire_to_event, /* wire_to_event */ - event_to_wire, /* event_to_wire */ - NULL, /* error */ - error_string, /* error_string */ -}; - -static /* const */ char *multibuf_error_list[] = { - "BadBuffer", /* MultibufferBadBuffer */ -}; - -static XEXT_GENERATE_FIND_DISPLAY (find_display, multibuf_info, - multibuf_extension_name, - &multibuf_extension_hooks, - MultibufferNumberEvents, NULL) - -static XEXT_GENERATE_CLOSE_DISPLAY (close_display, multibuf_info) - -static XEXT_GENERATE_ERROR_STRING (error_string, multibuf_extension_name, - MultibufferNumberErrors, - multibuf_error_list) - -/* - * wire_to_event - convert a wire event in network format to a C - * event structure - */ -static Bool wire_to_event (Display *dpy, XEvent *libevent, xEvent *netevent) -{ - XExtDisplayInfo *info = find_display (dpy); - - MbufCheckExtension (dpy, info, False); - - switch ((netevent->u.u.type & 0x7f) - info->codes->first_event) { - case MultibufferClobberNotify: - { - XmbufClobberNotifyEvent *ev; - xMbufClobberNotifyEvent *event; - - ev = (XmbufClobberNotifyEvent *) libevent; - event = (xMbufClobberNotifyEvent *) netevent; - ev->type = event->type & 0x7f; - ev->serial = _XSetLastRequestRead(dpy,(xGenericReply *) netevent); - ev->send_event = ((event->type & 0x80) != 0); - ev->display = dpy; - ev->buffer = event->buffer; - ev->state = event->state; - return True; - } - case MultibufferUpdateNotify: - { - XmbufUpdateNotifyEvent *ev; - xMbufUpdateNotifyEvent *event; - - ev = (XmbufUpdateNotifyEvent *) libevent; - event = (xMbufUpdateNotifyEvent *) netevent; - ev->type = event->type & 0x7f; - ev->serial = _XSetLastRequestRead(dpy,(xGenericReply *) netevent); - ev->send_event = ((event->type & 0x80) != 0); - ev->display = dpy; - ev->buffer = event->buffer; - return True; - } - } - return False; -} - - -/* - * event_to_wire - convert a C event structure to a wire event in - * network format - */ -static Status event_to_wire (Display *dpy, XEvent *libevent, xEvent *netevent) -{ - XExtDisplayInfo *info = find_display (dpy); - - MbufCheckExtension (dpy, info, 0); - - switch ((libevent->type & 0x7f) - info->codes->first_event) { - case MultibufferClobberNotify: - { - XmbufClobberNotifyEvent *ev; - xMbufClobberNotifyEvent *event; - - ev = (XmbufClobberNotifyEvent *) libevent; - event = (xMbufClobberNotifyEvent *) netevent; - event->type = ev->type; - event->sequenceNumber = (ev->serial & 0xffff); - event->buffer = ev->buffer; - event->state = ev->state; - return 1; - } - case MultibufferUpdateNotify: - { - XmbufUpdateNotifyEvent *ev; - xMbufUpdateNotifyEvent *event; - - ev = (XmbufUpdateNotifyEvent *) libevent; - event = (xMbufUpdateNotifyEvent *) netevent; - event->type = ev->type; - event->sequenceNumber = (ev->serial & 0xffff); - event->buffer = ev->buffer; - return 1; - } - } - return 0; -} - - -/* - * read_buffer_info - read Buffer Info descriptors from the net; if unable - * to allocate memory, read junk to make sure that stream is clear. - */ -#define TALLOC(type,count) ((type *) Xmalloc ((unsigned) count * sizeof(type))) - -static XmbufBufferInfo *read_buffer_info (Display *dpy, int nbufs) -{ - xMbufBufferInfo *netbuf = TALLOC (xMbufBufferInfo, nbufs); - XmbufBufferInfo *bufinfo = NULL; - long netbytes = nbufs * SIZEOF(xMbufBufferInfo); - - if (netbuf) { - _XRead (dpy, (char *) netbuf, netbytes); - - bufinfo = TALLOC (XmbufBufferInfo, nbufs); - if (bufinfo) { - register XmbufBufferInfo *c; - register xMbufBufferInfo *net; - register int i; - - for (i = 0, c = bufinfo, net = netbuf; i < nbufs; - i++, c++, net++) { - c->visualid = net->visualID; - c->max_buffers = net->maxBuffers; - c->depth = net->depth; - } - } - Xfree ((char *) netbuf); - } else { /* eat the data */ - while (netbytes > 0) { - char dummy[256]; /* stack size vs loops tradeoff */ - long nbytes = sizeof dummy; - - if (nbytes > netbytes) nbytes = netbytes; - _XRead (dpy, dummy, nbytes); - netbytes -= nbytes; - } - } - - return bufinfo; -} - -#undef TALLOC - - -/***************************************************************************** - * * - * Multibuffering/stereo public interfaces * - * * - *****************************************************************************/ - - -/* - * XmbufQueryExtension - - * Returns True if the multibuffering/stereo extension is available - * on the given display. If the extension exists, the value of the - * first event code (which should be added to the event type constants - * MultibufferClobberNotify and MultibufferUpdateNotify to get the - * actual values) is stored into event_base and the value of the first - * error code (which should be added to the error type constant - * MultibufferBadBuffer to get the actual value) is stored into - * error_base. - */ -Bool XmbufQueryExtension ( - Display *dpy, - int *event_base_return, int *error_base_return) -{ - XExtDisplayInfo *info = find_display (dpy); - - if (XextHasExtension (info)) { - *event_base_return = info->codes->first_event; - *error_base_return = info->codes->first_error; - return True; - } else { - return False; - } -} - - -/* - * XmbufGetVersion - - * Gets the major and minor version numbers of the extension. The return - * value is zero if an error occurs or non-zero if no error happens. - */ -Status XmbufGetVersion ( - Display *dpy, - int *major_version_return, int *minor_version_return) -{ - XExtDisplayInfo *info = find_display (dpy); - xMbufGetBufferVersionReply rep; - register xMbufGetBufferVersionReq *req; - - MbufCheckExtension (dpy, info, 0); - - LockDisplay (dpy); - MbufGetReq (MbufGetBufferVersion, req, info); - if (!_XReply (dpy, (xReply *) &rep, 0, xTrue)) { - UnlockDisplay (dpy); - SyncHandle (); - return 0; - } - *major_version_return = rep.majorVersion; - *minor_version_return = rep.minorVersion; - UnlockDisplay (dpy); - - SyncHandle (); - return 1; -} - - -/* - * XmbufCreateBuffers - - * Requests that "count" buffers be created with the given update_action - * and update_hint and be associated with the indicated window. The - * number of buffers created is returned (zero if an error occurred) - * and buffers_return is filled in with that many Multibuffer identifiers. - */ -int XmbufCreateBuffers ( - Display *dpy, - Window w, - int count, - int update_action, int update_hint, - Multibuffer *buffers) -{ - XExtDisplayInfo *info = find_display (dpy); - xMbufCreateImageBuffersReply rep; - register xMbufCreateImageBuffersReq *req; - int result; - - MbufCheckExtension (dpy, info, 0); - - LockDisplay (dpy); - - XAllocIDs(dpy, buffers, count); - MbufGetReq (MbufCreateImageBuffers, req, info); - req->window = w; - req->updateAction = update_action; - req->updateHint = update_hint; - req->length += count; - count <<= 2; - PackData32 (dpy, buffers, count); - if (!_XReply (dpy, (xReply *) &rep, 0, xTrue)) { - UnlockDisplay (dpy); - SyncHandle (); - return 0; - } - result = rep.numberBuffer; - UnlockDisplay (dpy); - - SyncHandle (); - return result; -} - - -/* - * XmbufDestroyBuffers - - * Destroys the buffers associated with the given window. - */ -void XmbufDestroyBuffers (Display *dpy, Window window) -{ - XExtDisplayInfo *info = find_display (dpy); - register xMbufDestroyImageBuffersReq *req; - - MbufSimpleCheckExtension (dpy, info); - - LockDisplay (dpy); - MbufGetReq (MbufDestroyImageBuffers, req, info); - req->window = window; - UnlockDisplay (dpy); - SyncHandle (); -} - - -/* - * XmbufDisplayBuffers - - * Displays the indicated buffers their appropriate windows within - * max_delay milliseconds after min_delay milliseconds have passed. - * No two buffers may be associated with the same window or else a Match - * error is generated. - */ -void XmbufDisplayBuffers ( - Display *dpy, - int count, - Multibuffer *buffers, - int min_delay, int max_delay) -{ - XExtDisplayInfo *info = find_display (dpy); - register xMbufDisplayImageBuffersReq *req; - - MbufSimpleCheckExtension (dpy, info); - - LockDisplay (dpy); - MbufGetReq (MbufDisplayImageBuffers, req, info); - req->minDelay = min_delay; - req->maxDelay = max_delay; - req->length += count; - count <<= 2; - PackData32 (dpy, buffers, count); - UnlockDisplay (dpy); - SyncHandle(); -} - - -/* - * XmbufGetWindowAttributes - - * Gets the multibuffering attributes that apply to all buffers associated - * with the given window. Returns non-zero on success and zero if an - * error occurs. - */ -Status XmbufGetWindowAttributes ( - Display *dpy, - Window w, - XmbufWindowAttributes *attr) -{ - XExtDisplayInfo *info = find_display (dpy); - register xMbufGetMBufferAttributesReq *req; - xMbufGetMBufferAttributesReply rep; - - MbufCheckExtension (dpy, info, 0); - - LockDisplay (dpy); - MbufGetReq (MbufGetMBufferAttributes, req, info); - req->window = w; - if (!_XReply (dpy, (xReply *) &rep, 0, xFalse)) { - UnlockDisplay (dpy); - SyncHandle (); - return 0; - } - attr->buffers = (Multibuffer *) NULL; - if ((attr->nbuffers = rep.length)) { - int nbytes = rep.length * sizeof(Multibuffer); - attr->buffers = (Multibuffer *) Xmalloc((unsigned) nbytes); - nbytes = rep.length << 2; - if (! attr->buffers) { - _XEatData(dpy, (unsigned long) nbytes); - UnlockDisplay(dpy); - SyncHandle(); - return (0); - } - _XRead32 (dpy, (long *) attr->buffers, nbytes); - } - attr->displayed_index = rep.displayedBuffer; - attr->update_action = rep.updateAction; - attr->update_hint = rep.updateHint; - attr->window_mode = rep.windowMode; - - UnlockDisplay (dpy); - SyncHandle(); - return 1; -} - - -/* - * XmbufChangeWindowAttributes - - * Sets the multibuffering attributes that apply to all buffers associated - * with the given window. This is currently limited to the update_hint. - */ -void XmbufChangeWindowAttributes ( - Display *dpy, - Window w, - unsigned long valuemask, - XmbufSetWindowAttributes *attr) -{ - XExtDisplayInfo *info = find_display (dpy); - register xMbufSetMBufferAttributesReq *req; - - MbufSimpleCheckExtension (dpy, info); - - LockDisplay (dpy); - MbufGetReq (MbufSetMBufferAttributes, req, info); - req->window = w; - if ((req->valueMask = valuemask)) { /* stolen from lib/X/XWindow.c */ - unsigned long values[1]; /* one per element in if stmts below */ - unsigned long *v = values; - unsigned int nvalues; - - if (valuemask & MultibufferWindowUpdateHint) - *v++ = attr->update_hint; - req->length += (nvalues = v - values); - nvalues <<= 2; /* watch out for macros... */ - Data32 (dpy, (long *) values, (long)nvalues); - } - UnlockDisplay (dpy); - SyncHandle(); -} - - -/* - * XmbufGetBufferAttributes - - * Gets the attributes for the indicated buffer. Returns non-zero on - * success and zero if an error occurs. - */ -Status XmbufGetBufferAttributes ( - Display *dpy, - Multibuffer b, - XmbufBufferAttributes *attr) -{ - XExtDisplayInfo *info = find_display (dpy); - register xMbufGetBufferAttributesReq *req; - xMbufGetBufferAttributesReply rep; - - MbufCheckExtension (dpy, info, 0); - - LockDisplay (dpy); - MbufGetReq (MbufGetBufferAttributes, req, info); - req->buffer = b; - if (!_XReply (dpy, (xReply *) &rep, 0, xTrue)) { - UnlockDisplay (dpy); - SyncHandle (); - return 0; - } - attr->window = rep.window; - attr->event_mask = rep.eventMask; - attr->buffer_index = rep.bufferIndex; - attr->side = rep.side; - - UnlockDisplay (dpy); - SyncHandle(); - return 1; -} - - -/* - * XmbufChangeBufferAttributes - - * Sets the attributes for the indicated buffer. This is currently - * limited to the event_mask. - */ -void XmbufChangeBufferAttributes ( - Display *dpy, - Multibuffer b, - unsigned long valuemask, - XmbufSetBufferAttributes *attr) -{ - XExtDisplayInfo *info = find_display (dpy); - register xMbufSetBufferAttributesReq *req; - - MbufSimpleCheckExtension (dpy, info); - - LockDisplay (dpy); - MbufGetReq (MbufSetBufferAttributes, req, info); - req->buffer = b; - if ((req->valueMask = valuemask)) { /* stolen from lib/X/XWindow.c */ - unsigned long values[1]; /* one per element in if stmts below */ - unsigned long *v = values; - unsigned int nvalues; - - if (valuemask & MultibufferBufferEventMask) - *v++ = attr->event_mask; - req->length += (nvalues = v - values); - nvalues <<= 2; /* watch out for macros... */ - Data32 (dpy, (long *) values, (long)nvalues); - } - UnlockDisplay (dpy); - SyncHandle(); -} - - - -/* - * XmbufGetScreenInfo - - * Gets the parameters controlling how mono and stereo windows may be - * created on the indicated screen. The numbers of sets of visual and - * depths are returned in nmono_return and nstereo_return. If - * nmono_return is greater than zero, then mono_info_return is set to - * the address of an array of XmbufBufferInfo structures describing the - * various visuals and depths that may be used. Otherwise, - * mono_info_return is set to NULL. Similarly, stereo_info_return is - * set according to nstereo_return. The storage returned in - * mono_info_return and stereo_info_return may be released by XFree. - * If no errors are encounted, non-zero will be returned. - */ -Status XmbufGetScreenInfo ( - Display *dpy, - Drawable d, - int *nmono_return, - XmbufBufferInfo **mono_info_return, - int *nstereo_return, - XmbufBufferInfo **stereo_info_return) -{ - XExtDisplayInfo *info = find_display (dpy); - register xMbufGetBufferInfoReq *req; - xMbufGetBufferInfoReply rep; - int nmono, nstereo; - XmbufBufferInfo *minfo, *sinfo; - - MbufCheckExtension (dpy, info, 0); - - LockDisplay (dpy); - MbufGetReq (MbufGetBufferInfo, req, info); - req->drawable = d; - if (!_XReply (dpy, (xReply *) &rep, 0, xFalse)) { - UnlockDisplay (dpy); - SyncHandle (); - return 0; - } - nmono = rep.normalInfo; - nstereo = rep.stereoInfo; - minfo = ((nmono > 0) ? read_buffer_info (dpy, nmono) : NULL); - sinfo = ((nstereo > 0) ? read_buffer_info (dpy, nstereo) : NULL); - - /* check for bad reads indicating we need to return an error */ - if ((nmono > 0 && !minfo) || (nstereo > 0 && !sinfo)) { - if (minfo) Xfree ((char *) minfo); - if (sinfo) Xfree ((char *) sinfo); - UnlockDisplay (dpy); - SyncHandle(); - return 0; - } - - *nmono_return = nmono; - *mono_info_return = minfo; - *nstereo_return = nstereo; - *stereo_info_return = sinfo; - - UnlockDisplay (dpy); - SyncHandle(); - return 1; -} - - -/* - * XmbufCreateStereoWindow - - * Creates a stereo window in the same way that XCreateWindow creates - * a mono window (in fact, use the same code, except for the request) - * and returns the left and right buffers that may be - */ -Window XmbufCreateStereoWindow ( - Display *dpy, - Window parent, - int x, int y, - unsigned int width, unsigned int height, unsigned int border_width, - int depth, - unsigned int class, - Visual *visual, - unsigned long valuemask, - XSetWindowAttributes *attr, - Multibuffer *leftp, Multibuffer *rightp) -{ - XExtDisplayInfo *info = find_display (dpy); - Window wid; - register xMbufCreateStereoWindowReq *req; - - MbufCheckExtension (dpy, info, None); - - LockDisplay(dpy); - MbufGetReq(MbufCreateStereoWindow, req, info); - wid = req->wid = XAllocID(dpy); - req->parent = parent; - req->left = *leftp = XAllocID (dpy); - req->right = *rightp = XAllocID (dpy); - req->x = x; - req->y = y; - req->width = width; - req->height = height; - req->borderWidth = border_width; - req->depth = depth; - req->class = class; - if (visual == (Visual *)CopyFromParent) - req->visual = CopyFromParent; - else - req->visual = visual->visualid; - valuemask &= (CWBackPixmap|CWBackPixel|CWBorderPixmap| - CWBorderPixel|CWBitGravity|CWWinGravity| - CWBackingStore|CWBackingPlanes|CWBackingPixel| - CWOverrideRedirect|CWSaveUnder|CWEventMask| - CWDontPropagate|CWColormap|CWCursor); - if ((req->mask = valuemask)) { - unsigned long values[32]; - register unsigned long *value = values; - unsigned int nvalues; - - if (valuemask & CWBackPixmap) - *value++ = attr->background_pixmap; - if (valuemask & CWBackPixel) - *value++ = attr->background_pixel; - if (valuemask & CWBorderPixmap) - *value++ = attr->border_pixmap; - if (valuemask & CWBorderPixel) - *value++ = attr->border_pixel; - if (valuemask & CWBitGravity) - *value++ = attr->bit_gravity; - if (valuemask & CWWinGravity) - *value++ = attr->win_gravity; - if (valuemask & CWBackingStore) - *value++ = attr->backing_store; - if (valuemask & CWBackingPlanes) - *value++ = attr->backing_planes; - if (valuemask & CWBackingPixel) - *value++ = attr->backing_pixel; - if (valuemask & CWOverrideRedirect) - *value++ = attr->override_redirect; - if (valuemask & CWSaveUnder) - *value++ = attr->save_under; - if (valuemask & CWEventMask) - *value++ = attr->event_mask; - if (valuemask & CWDontPropagate) - *value++ = attr->do_not_propagate_mask; - if (valuemask & CWColormap) - *value++ = attr->colormap; - if (valuemask & CWCursor) - *value++ = attr->cursor; - req->length += (nvalues = value - values); - - nvalues <<= 2; /* watch out for macros... */ - Data32 (dpy, (long *) values, (long)nvalues); - } - UnlockDisplay(dpy); - SyncHandle(); - return wid; -} - -void XmbufClearBufferArea ( - Display *dpy, - Multibuffer buffer, - int x, int y, - unsigned int width, unsigned int height, - Bool exposures) -{ - XExtDisplayInfo *info = find_display (dpy); - register xMbufClearImageBufferAreaReq *req; - - MbufSimpleCheckExtension (dpy, info); - - LockDisplay (dpy); - MbufGetReq (MbufClearImageBufferArea, req, info); - req->buffer = buffer; - req->x = x; - req->y = y; - req->width = width; - req->height = height; - req->exposures = exposures; - UnlockDisplay (dpy); - SyncHandle(); -} - +/*
+ * $Xorg: XMultibuf.c,v 1.6 2001/02/09 02:03:49 xorgcvs Exp $
+ *
+Copyright 1989, 1998 The Open Group
+
+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.
+
+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
+OPEN GROUP 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 Open Group shall not be
+used in advertising or otherwise to promote the sale, use or other dealings
+in this Software without prior written authorization from The Open Group.
+ *
+ * Authors: Jim Fulton, MIT X Consortium
+ */
+/* $XFree86: xc/lib/Xext/XMultibuf.c,v 1.5 2001/12/14 19:55:00 dawes Exp $ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+#include <X11/Xlibint.h>
+#include <stdio.h>
+#include <X11/extensions/Xext.h>
+#include <X11/extensions/extutil.h>
+#include <X11/extensions/multibufproto.h>
+#include <X11/extensions/multibuf.h>
+
+static XExtensionInfo _multibuf_info_data;
+static XExtensionInfo *multibuf_info = &_multibuf_info_data;
+static /* const */ char *multibuf_extension_name = MULTIBUFFER_PROTOCOL_NAME;
+
+#define MbufCheckExtension(dpy,i,val) \
+ XextCheckExtension (dpy, i, multibuf_extension_name, val)
+#define MbufSimpleCheckExtension(dpy,i) \
+ XextSimpleCheckExtension (dpy, i, multibuf_extension_name)
+
+
+/*****************************************************************************
+ * *
+ * private utility routines *
+ * *
+ *****************************************************************************/
+
+/*
+ * find_display - locate the display info block
+ */
+static int close_display(Display *dpy, XExtCodes *codes);
+static char *error_string(Display *dpy, int code, XExtCodes *codes, char *buf, int n);
+static Bool wire_to_event(Display *dpy, XEvent *libevent, xEvent *netevent);
+static Status event_to_wire(Display *dpy, XEvent *libevent, xEvent *netevent);
+static /* const */ XExtensionHooks multibuf_extension_hooks = {
+ NULL, /* create_gc */
+ NULL, /* copy_gc */
+ NULL, /* flush_gc */
+ NULL, /* free_gc */
+ NULL, /* create_font */
+ NULL, /* free_font */
+ close_display, /* close_display */
+ wire_to_event, /* wire_to_event */
+ event_to_wire, /* event_to_wire */
+ NULL, /* error */
+ error_string, /* error_string */
+};
+
+static /* const */ char *multibuf_error_list[] = {
+ "BadBuffer", /* MultibufferBadBuffer */
+};
+
+static XEXT_GENERATE_FIND_DISPLAY (find_display, multibuf_info,
+ multibuf_extension_name,
+ &multibuf_extension_hooks,
+ MultibufferNumberEvents, NULL)
+
+static XEXT_GENERATE_CLOSE_DISPLAY (close_display, multibuf_info)
+
+static XEXT_GENERATE_ERROR_STRING (error_string, multibuf_extension_name,
+ MultibufferNumberErrors,
+ multibuf_error_list)
+
+/*
+ * wire_to_event - convert a wire event in network format to a C
+ * event structure
+ */
+static Bool wire_to_event (Display *dpy, XEvent *libevent, xEvent *netevent)
+{
+ XExtDisplayInfo *info = find_display (dpy);
+
+ MbufCheckExtension (dpy, info, False);
+
+ switch ((netevent->u.u.type & 0x7f) - info->codes->first_event) {
+ case MultibufferClobberNotify:
+ {
+ XmbufClobberNotifyEvent *ev;
+ xMbufClobberNotifyEvent *event;
+
+ ev = (XmbufClobberNotifyEvent *) libevent;
+ event = (xMbufClobberNotifyEvent *) netevent;
+ ev->type = event->type & 0x7f;
+ ev->serial = _XSetLastRequestRead(dpy,(xGenericReply *) netevent);
+ ev->send_event = ((event->type & 0x80) != 0);
+ ev->display = dpy;
+ ev->buffer = event->buffer;
+ ev->state = event->state;
+ return True;
+ }
+ case MultibufferUpdateNotify:
+ {
+ XmbufUpdateNotifyEvent *ev;
+ xMbufUpdateNotifyEvent *event;
+
+ ev = (XmbufUpdateNotifyEvent *) libevent;
+ event = (xMbufUpdateNotifyEvent *) netevent;
+ ev->type = event->type & 0x7f;
+ ev->serial = _XSetLastRequestRead(dpy,(xGenericReply *) netevent);
+ ev->send_event = ((event->type & 0x80) != 0);
+ ev->display = dpy;
+ ev->buffer = event->buffer;
+ return True;
+ }
+ }
+ return False;
+}
+
+
+/*
+ * event_to_wire - convert a C event structure to a wire event in
+ * network format
+ */
+static Status event_to_wire (Display *dpy, XEvent *libevent, xEvent *netevent)
+{
+ XExtDisplayInfo *info = find_display (dpy);
+
+ MbufCheckExtension (dpy, info, 0);
+
+ switch ((libevent->type & 0x7f) - info->codes->first_event) {
+ case MultibufferClobberNotify:
+ {
+ XmbufClobberNotifyEvent *ev;
+ xMbufClobberNotifyEvent *event;
+
+ ev = (XmbufClobberNotifyEvent *) libevent;
+ event = (xMbufClobberNotifyEvent *) netevent;
+ event->type = ev->type;
+ event->sequenceNumber = (ev->serial & 0xffff);
+ event->buffer = ev->buffer;
+ event->state = ev->state;
+ return 1;
+ }
+ case MultibufferUpdateNotify:
+ {
+ XmbufUpdateNotifyEvent *ev;
+ xMbufUpdateNotifyEvent *event;
+
+ ev = (XmbufUpdateNotifyEvent *) libevent;
+ event = (xMbufUpdateNotifyEvent *) netevent;
+ event->type = ev->type;
+ event->sequenceNumber = (ev->serial & 0xffff);
+ event->buffer = ev->buffer;
+ return 1;
+ }
+ }
+ return 0;
+}
+
+
+/*
+ * read_buffer_info - read Buffer Info descriptors from the net; if unable
+ * to allocate memory, read junk to make sure that stream is clear.
+ */
+#define TALLOC(type,count) ((type *) Xmalloc ((unsigned) count * sizeof(type)))
+
+static XmbufBufferInfo *read_buffer_info (Display *dpy, int nbufs)
+{
+ xMbufBufferInfo *netbuf = TALLOC (xMbufBufferInfo, nbufs);
+ XmbufBufferInfo *bufinfo = NULL;
+ long netbytes = nbufs * SIZEOF(xMbufBufferInfo);
+
+ if (netbuf) {
+ _XRead (dpy, (char *) netbuf, netbytes);
+
+ bufinfo = TALLOC (XmbufBufferInfo, nbufs);
+ if (bufinfo) {
+ register XmbufBufferInfo *c;
+ register xMbufBufferInfo *net;
+ register int i;
+
+ for (i = 0, c = bufinfo, net = netbuf; i < nbufs;
+ i++, c++, net++) {
+ c->visualid = net->visualID;
+ c->max_buffers = net->maxBuffers;
+ c->depth = net->depth;
+ }
+ }
+ Xfree ((char *) netbuf);
+ } else { /* eat the data */
+ while (netbytes > 0) {
+ char dummy[256]; /* stack size vs loops tradeoff */
+ long nbytes = sizeof dummy;
+
+ if (nbytes > netbytes) nbytes = netbytes;
+ _XRead (dpy, dummy, nbytes);
+ netbytes -= nbytes;
+ }
+ }
+
+ return bufinfo;
+}
+
+#undef TALLOC
+
+
+/*****************************************************************************
+ * *
+ * Multibuffering/stereo public interfaces *
+ * *
+ *****************************************************************************/
+
+
+/*
+ * XmbufQueryExtension -
+ * Returns True if the multibuffering/stereo extension is available
+ * on the given display. If the extension exists, the value of the
+ * first event code (which should be added to the event type constants
+ * MultibufferClobberNotify and MultibufferUpdateNotify to get the
+ * actual values) is stored into event_base and the value of the first
+ * error code (which should be added to the error type constant
+ * MultibufferBadBuffer to get the actual value) is stored into
+ * error_base.
+ */
+Bool XmbufQueryExtension (
+ Display *dpy,
+ int *event_base_return, int *error_base_return)
+{
+ XExtDisplayInfo *info = find_display (dpy);
+
+ if (XextHasExtension (info)) {
+ *event_base_return = info->codes->first_event;
+ *error_base_return = info->codes->first_error;
+ return True;
+ } else {
+ return False;
+ }
+}
+
+
+/*
+ * XmbufGetVersion -
+ * Gets the major and minor version numbers of the extension. The return
+ * value is zero if an error occurs or non-zero if no error happens.
+ */
+Status XmbufGetVersion (
+ Display *dpy,
+ int *major_version_return, int *minor_version_return)
+{
+ XExtDisplayInfo *info = find_display (dpy);
+ xMbufGetBufferVersionReply rep;
+ register xMbufGetBufferVersionReq *req;
+
+ MbufCheckExtension (dpy, info, 0);
+
+ LockDisplay (dpy);
+ MbufGetReq (MbufGetBufferVersion, req, info);
+ if (!_XReply (dpy, (xReply *) &rep, 0, xTrue)) {
+ UnlockDisplay (dpy);
+ SyncHandle ();
+ return 0;
+ }
+ *major_version_return = rep.majorVersion;
+ *minor_version_return = rep.minorVersion;
+ UnlockDisplay (dpy);
+
+ SyncHandle ();
+ return 1;
+}
+
+
+/*
+ * XmbufCreateBuffers -
+ * Requests that "count" buffers be created with the given update_action
+ * and update_hint and be associated with the indicated window. The
+ * number of buffers created is returned (zero if an error occurred)
+ * and buffers_return is filled in with that many Multibuffer identifiers.
+ */
+int XmbufCreateBuffers (
+ Display *dpy,
+ Window w,
+ int count,
+ int update_action, int update_hint,
+ Multibuffer *buffers)
+{
+ XExtDisplayInfo *info = find_display (dpy);
+ xMbufCreateImageBuffersReply rep;
+ register xMbufCreateImageBuffersReq *req;
+ int result;
+
+ MbufCheckExtension (dpy, info, 0);
+
+ LockDisplay (dpy);
+
+ XAllocIDs(dpy, buffers, count);
+ MbufGetReq (MbufCreateImageBuffers, req, info);
+ req->window = w;
+ req->updateAction = update_action;
+ req->updateHint = update_hint;
+ req->length += count;
+ count <<= 2;
+ PackData32 (dpy, buffers, count);
+ if (!_XReply (dpy, (xReply *) &rep, 0, xTrue)) {
+ UnlockDisplay (dpy);
+ SyncHandle ();
+ return 0;
+ }
+ result = rep.numberBuffer;
+ UnlockDisplay (dpy);
+
+ SyncHandle ();
+ return result;
+}
+
+
+/*
+ * XmbufDestroyBuffers -
+ * Destroys the buffers associated with the given window.
+ */
+void XmbufDestroyBuffers (Display *dpy, Window window)
+{
+ XExtDisplayInfo *info = find_display (dpy);
+ register xMbufDestroyImageBuffersReq *req;
+
+ MbufSimpleCheckExtension (dpy, info);
+
+ LockDisplay (dpy);
+ MbufGetReq (MbufDestroyImageBuffers, req, info);
+ req->window = window;
+ UnlockDisplay (dpy);
+ SyncHandle ();
+}
+
+
+/*
+ * XmbufDisplayBuffers -
+ * Displays the indicated buffers their appropriate windows within
+ * max_delay milliseconds after min_delay milliseconds have passed.
+ * No two buffers may be associated with the same window or else a Match
+ * error is generated.
+ */
+void XmbufDisplayBuffers (
+ Display *dpy,
+ int count,
+ Multibuffer *buffers,
+ int min_delay, int max_delay)
+{
+ XExtDisplayInfo *info = find_display (dpy);
+ register xMbufDisplayImageBuffersReq *req;
+
+ MbufSimpleCheckExtension (dpy, info);
+
+ LockDisplay (dpy);
+ MbufGetReq (MbufDisplayImageBuffers, req, info);
+ req->minDelay = min_delay;
+ req->maxDelay = max_delay;
+ req->length += count;
+ count <<= 2;
+ PackData32 (dpy, buffers, count);
+ UnlockDisplay (dpy);
+ SyncHandle();
+}
+
+
+/*
+ * XmbufGetWindowAttributes -
+ * Gets the multibuffering attributes that apply to all buffers associated
+ * with the given window. Returns non-zero on success and zero if an
+ * error occurs.
+ */
+Status XmbufGetWindowAttributes (
+ Display *dpy,
+ Window w,
+ XmbufWindowAttributes *attr)
+{
+ XExtDisplayInfo *info = find_display (dpy);
+ register xMbufGetMBufferAttributesReq *req;
+ xMbufGetMBufferAttributesReply rep;
+
+ MbufCheckExtension (dpy, info, 0);
+
+ LockDisplay (dpy);
+ MbufGetReq (MbufGetMBufferAttributes, req, info);
+ req->window = w;
+ if (!_XReply (dpy, (xReply *) &rep, 0, xFalse)) {
+ UnlockDisplay (dpy);
+ SyncHandle ();
+ return 0;
+ }
+ attr->buffers = (Multibuffer *) NULL;
+ if ((attr->nbuffers = rep.length)) {
+ int nbytes = rep.length * sizeof(Multibuffer);
+ attr->buffers = (Multibuffer *) Xmalloc((unsigned) nbytes);
+ nbytes = rep.length << 2;
+ if (! attr->buffers) {
+ _XEatData(dpy, (unsigned long) nbytes);
+ UnlockDisplay(dpy);
+ SyncHandle();
+ return (0);
+ }
+ _XRead32 (dpy, (long *) attr->buffers, nbytes);
+ }
+ attr->displayed_index = rep.displayedBuffer;
+ attr->update_action = rep.updateAction;
+ attr->update_hint = rep.updateHint;
+ attr->window_mode = rep.windowMode;
+
+ UnlockDisplay (dpy);
+ SyncHandle();
+ return 1;
+}
+
+
+/*
+ * XmbufChangeWindowAttributes -
+ * Sets the multibuffering attributes that apply to all buffers associated
+ * with the given window. This is currently limited to the update_hint.
+ */
+void XmbufChangeWindowAttributes (
+ Display *dpy,
+ Window w,
+ unsigned long valuemask,
+ XmbufSetWindowAttributes *attr)
+{
+ XExtDisplayInfo *info = find_display (dpy);
+ register xMbufSetMBufferAttributesReq *req;
+
+ MbufSimpleCheckExtension (dpy, info);
+
+ LockDisplay (dpy);
+ MbufGetReq (MbufSetMBufferAttributes, req, info);
+ req->window = w;
+ if ((req->valueMask = valuemask)) { /* stolen from lib/X/XWindow.c */
+ unsigned long values[1]; /* one per element in if stmts below */
+ unsigned long *v = values;
+ unsigned int nvalues;
+
+ if (valuemask & MultibufferWindowUpdateHint)
+ *v++ = attr->update_hint;
+ req->length += (nvalues = v - values);
+ nvalues <<= 2; /* watch out for macros... */
+ Data32 (dpy, (long *) values, (long)nvalues);
+ }
+ UnlockDisplay (dpy);
+ SyncHandle();
+}
+
+
+/*
+ * XmbufGetBufferAttributes -
+ * Gets the attributes for the indicated buffer. Returns non-zero on
+ * success and zero if an error occurs.
+ */
+Status XmbufGetBufferAttributes (
+ Display *dpy,
+ Multibuffer b,
+ XmbufBufferAttributes *attr)
+{
+ XExtDisplayInfo *info = find_display (dpy);
+ register xMbufGetBufferAttributesReq *req;
+ xMbufGetBufferAttributesReply rep;
+
+ MbufCheckExtension (dpy, info, 0);
+
+ LockDisplay (dpy);
+ MbufGetReq (MbufGetBufferAttributes, req, info);
+ req->buffer = b;
+ if (!_XReply (dpy, (xReply *) &rep, 0, xTrue)) {
+ UnlockDisplay (dpy);
+ SyncHandle ();
+ return 0;
+ }
+ attr->window = rep.window;
+ attr->event_mask = rep.eventMask;
+ attr->buffer_index = rep.bufferIndex;
+ attr->side = rep.side;
+
+ UnlockDisplay (dpy);
+ SyncHandle();
+ return 1;
+}
+
+
+/*
+ * XmbufChangeBufferAttributes -
+ * Sets the attributes for the indicated buffer. This is currently
+ * limited to the event_mask.
+ */
+void XmbufChangeBufferAttributes (
+ Display *dpy,
+ Multibuffer b,
+ unsigned long valuemask,
+ XmbufSetBufferAttributes *attr)
+{
+ XExtDisplayInfo *info = find_display (dpy);
+ register xMbufSetBufferAttributesReq *req;
+
+ MbufSimpleCheckExtension (dpy, info);
+
+ LockDisplay (dpy);
+ MbufGetReq (MbufSetBufferAttributes, req, info);
+ req->buffer = b;
+ if ((req->valueMask = valuemask)) { /* stolen from lib/X/XWindow.c */
+ unsigned long values[1]; /* one per element in if stmts below */
+ unsigned long *v = values;
+ unsigned int nvalues;
+
+ if (valuemask & MultibufferBufferEventMask)
+ *v++ = attr->event_mask;
+ req->length += (nvalues = v - values);
+ nvalues <<= 2; /* watch out for macros... */
+ Data32 (dpy, (long *) values, (long)nvalues);
+ }
+ UnlockDisplay (dpy);
+ SyncHandle();
+}
+
+
+
+/*
+ * XmbufGetScreenInfo -
+ * Gets the parameters controlling how mono and stereo windows may be
+ * created on the indicated screen. The numbers of sets of visual and
+ * depths are returned in nmono_return and nstereo_return. If
+ * nmono_return is greater than zero, then mono_info_return is set to
+ * the address of an array of XmbufBufferInfo structures describing the
+ * various visuals and depths that may be used. Otherwise,
+ * mono_info_return is set to NULL. Similarly, stereo_info_return is
+ * set according to nstereo_return. The storage returned in
+ * mono_info_return and stereo_info_return may be released by XFree.
+ * If no errors are encounted, non-zero will be returned.
+ */
+Status XmbufGetScreenInfo (
+ Display *dpy,
+ Drawable d,
+ int *nmono_return,
+ XmbufBufferInfo **mono_info_return,
+ int *nstereo_return,
+ XmbufBufferInfo **stereo_info_return)
+{
+ XExtDisplayInfo *info = find_display (dpy);
+ register xMbufGetBufferInfoReq *req;
+ xMbufGetBufferInfoReply rep;
+ int nmono, nstereo;
+ XmbufBufferInfo *minfo, *sinfo;
+
+ MbufCheckExtension (dpy, info, 0);
+
+ LockDisplay (dpy);
+ MbufGetReq (MbufGetBufferInfo, req, info);
+ req->drawable = d;
+ if (!_XReply (dpy, (xReply *) &rep, 0, xFalse)) {
+ UnlockDisplay (dpy);
+ SyncHandle ();
+ return 0;
+ }
+ nmono = rep.normalInfo;
+ nstereo = rep.stereoInfo;
+ minfo = ((nmono > 0) ? read_buffer_info (dpy, nmono) : NULL);
+ sinfo = ((nstereo > 0) ? read_buffer_info (dpy, nstereo) : NULL);
+
+ /* check for bad reads indicating we need to return an error */
+ if ((nmono > 0 && !minfo) || (nstereo > 0 && !sinfo)) {
+ if (minfo) Xfree ((char *) minfo);
+ if (sinfo) Xfree ((char *) sinfo);
+ UnlockDisplay (dpy);
+ SyncHandle();
+ return 0;
+ }
+
+ *nmono_return = nmono;
+ *mono_info_return = minfo;
+ *nstereo_return = nstereo;
+ *stereo_info_return = sinfo;
+
+ UnlockDisplay (dpy);
+ SyncHandle();
+ return 1;
+}
+
+
+/*
+ * XmbufCreateStereoWindow -
+ * Creates a stereo window in the same way that XCreateWindow creates
+ * a mono window (in fact, use the same code, except for the request)
+ * and returns the left and right buffers that may be
+ */
+Window XmbufCreateStereoWindow (
+ Display *dpy,
+ Window parent,
+ int x, int y,
+ unsigned int width, unsigned int height, unsigned int border_width,
+ int depth,
+ unsigned int class,
+ Visual *visual,
+ unsigned long valuemask,
+ XSetWindowAttributes *attr,
+ Multibuffer *leftp, Multibuffer *rightp)
+{
+ XExtDisplayInfo *info = find_display (dpy);
+ Window wid;
+ register xMbufCreateStereoWindowReq *req;
+
+ MbufCheckExtension (dpy, info, None);
+
+ LockDisplay(dpy);
+ MbufGetReq(MbufCreateStereoWindow, req, info);
+ wid = req->wid = XAllocID(dpy);
+ req->parent = parent;
+ req->left = *leftp = XAllocID (dpy);
+ req->right = *rightp = XAllocID (dpy);
+ req->x = x;
+ req->y = y;
+ req->width = width;
+ req->height = height;
+ req->borderWidth = border_width;
+ req->depth = depth;
+ req->class = class;
+ if (visual == (Visual *)CopyFromParent)
+ req->visual = CopyFromParent;
+ else
+ req->visual = visual->visualid;
+ valuemask &= (CWBackPixmap|CWBackPixel|CWBorderPixmap|
+ CWBorderPixel|CWBitGravity|CWWinGravity|
+ CWBackingStore|CWBackingPlanes|CWBackingPixel|
+ CWOverrideRedirect|CWSaveUnder|CWEventMask|
+ CWDontPropagate|CWColormap|CWCursor);
+ if ((req->mask = valuemask)) {
+ unsigned long values[32];
+ register unsigned long *value = values;
+ unsigned int nvalues;
+
+ if (valuemask & CWBackPixmap)
+ *value++ = attr->background_pixmap;
+ if (valuemask & CWBackPixel)
+ *value++ = attr->background_pixel;
+ if (valuemask & CWBorderPixmap)
+ *value++ = attr->border_pixmap;
+ if (valuemask & CWBorderPixel)
+ *value++ = attr->border_pixel;
+ if (valuemask & CWBitGravity)
+ *value++ = attr->bit_gravity;
+ if (valuemask & CWWinGravity)
+ *value++ = attr->win_gravity;
+ if (valuemask & CWBackingStore)
+ *value++ = attr->backing_store;
+ if (valuemask & CWBackingPlanes)
+ *value++ = attr->backing_planes;
+ if (valuemask & CWBackingPixel)
+ *value++ = attr->backing_pixel;
+ if (valuemask & CWOverrideRedirect)
+ *value++ = attr->override_redirect;
+ if (valuemask & CWSaveUnder)
+ *value++ = attr->save_under;
+ if (valuemask & CWEventMask)
+ *value++ = attr->event_mask;
+ if (valuemask & CWDontPropagate)
+ *value++ = attr->do_not_propagate_mask;
+ if (valuemask & CWColormap)
+ *value++ = attr->colormap;
+ if (valuemask & CWCursor)
+ *value++ = attr->cursor;
+ req->length += (nvalues = value - values);
+
+ nvalues <<= 2; /* watch out for macros... */
+ Data32 (dpy, (long *) values, (long)nvalues);
+ }
+ UnlockDisplay(dpy);
+ SyncHandle();
+ return wid;
+}
+
+void XmbufClearBufferArea (
+ Display *dpy,
+ Multibuffer buffer,
+ int x, int y,
+ unsigned int width, unsigned int height,
+ Bool exposures)
+{
+ XExtDisplayInfo *info = find_display (dpy);
+ register xMbufClearImageBufferAreaReq *req;
+
+ MbufSimpleCheckExtension (dpy, info);
+
+ LockDisplay (dpy);
+ MbufGetReq (MbufClearImageBufferArea, req, info);
+ req->buffer = buffer;
+ req->x = x;
+ req->y = y;
+ req->width = width;
+ req->height = height;
+ req->exposures = exposures;
+ UnlockDisplay (dpy);
+ SyncHandle();
+}
+
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