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authormarha <marha@users.sourceforge.net>2010-05-27 08:08:37 +0000
committermarha <marha@users.sourceforge.net>2010-05-27 08:08:37 +0000
commit958dcdff6d845fcff20a414bd28be8ee2ced8c6c (patch)
tree3bc998a5af389cd1357dd672d96828573025cd0a /libXext/src/Xdbe.c
parent9b02c06e9c08d3d537d0a6fed3304b2146d49511 (diff)
parentbc4f49f9a9eccb73bc2c5610295febaf4b14559e (diff)
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svn merge ^/branches/released .
Diffstat (limited to 'libXext/src/Xdbe.c')
-rw-r--r--libXext/src/Xdbe.c947
1 files changed, 472 insertions, 475 deletions
diff --git a/libXext/src/Xdbe.c b/libXext/src/Xdbe.c
index 77344b4aa..2dd3509ca 100644
--- a/libXext/src/Xdbe.c
+++ b/libXext/src/Xdbe.c
@@ -1,475 +1,472 @@
-/* $Xorg: Xdbe.c,v 1.4 2000/08/17 19:45:53 cpqbld Exp $ */
-/******************************************************************************
- *
- * Copyright (c) 1994, 1995 Hewlett-Packard Company
- *
- * 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 HEWLETT-PACKARD COMPANY 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 Hewlett-Packard
- * Company 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 Hewlett-Packard Company.
- *
- * Xlib DBE code
- *
- *****************************************************************************/
-/* $XFree86: xc/lib/Xext/Xdbe.c,v 3.7 2002/10/16 02:19:22 dawes Exp $ */
-
-#define NEED_EVENTS
-#define NEED_REPLIES
-#ifdef HAVE_CONFIG_H
-#include <config.h>
-#endif
-#include <stdio.h>
-#include <X11/Xlibint.h>
-#include <X11/extensions/Xext.h>
-#include <X11/extensions/extutil.h>
-#include <X11/extensions/Xdbe.h>
-#include <X11/extensions/dbeproto.h>
-
-static XExtensionInfo _dbe_info_data;
-static XExtensionInfo *dbe_info = &_dbe_info_data;
-static char *dbe_extension_name = DBE_PROTOCOL_NAME;
-
-#define DbeCheckExtension(dpy,i,val) \
- XextCheckExtension (dpy, i, dbe_extension_name, val)
-#define DbeSimpleCheckExtension(dpy,i) \
- XextSimpleCheckExtension (dpy, i, dbe_extension_name)
-
-#if !defined(UNIXCPP)
-#define DbeGetReq(name,req,info) GetReq (name, req); \
- req->reqType = info->codes->major_opcode; \
- req->dbeReqType = X_##name;
-#else
-#define DbeGetReq(name,req,info) GetReq (name, req); \
- req->reqType = info->codes->major_opcode; \
- req->dbeReqType = X_/**/name;
-#endif
-
-
-/*****************************************************************************
- * *
- * 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 XExtensionHooks dbe_extension_hooks = {
- NULL, /* create_gc */
- NULL, /* copy_gc */
- NULL, /* flush_gc */
- NULL, /* free_gc */
- NULL, /* create_font */
- NULL, /* free_font */
- close_display, /* close_display */
- NULL, /* wire_to_event */
- NULL, /* event_to_wire */
- NULL, /* error */
- error_string, /* error_string */
-};
-
-static char *dbe_error_list[] = {
- "BadBuffer", /* DbeBadBuffer */
-};
-
-static XEXT_GENERATE_FIND_DISPLAY (find_display, dbe_info,
- dbe_extension_name,
- &dbe_extension_hooks,
- DbeNumberEvents, NULL)
-
-static XEXT_GENERATE_CLOSE_DISPLAY (close_display, dbe_info)
-
-static XEXT_GENERATE_ERROR_STRING (error_string, dbe_extension_name,
- DbeNumberErrors,
- dbe_error_list)
-
-
-/*****************************************************************************
- * *
- * Double-Buffering public interfaces *
- * *
- *****************************************************************************/
-
-/*
- * XdbeQueryExtension -
- * Sets major_version_return and minor_verion_return to the major and
- * minor DBE protocol version supported by the server. If the DBE
- * library is compatible with the version returned by the server, this
- * function returns non-zero. If dpy does not support the DBE
- * extension, or if there was an error during communication with the
- * server, or if the server and library protocol versions are
- * incompatible, this functions returns zero. No other Xdbe functions
- * may be called before this function. If a client violates this rule,
- * the effects of all subsequent Xdbe calls are undefined.
- */
-Status XdbeQueryExtension (
- Display *dpy,
- int *major_version_return,
- int *minor_version_return)
-{
- XExtDisplayInfo *info = find_display (dpy);
- xDbeGetVersionReply rep;
- register xDbeGetVersionReq *req;
-
- if (!XextHasExtension (info))
- return (Status)0; /* failure */
-
- LockDisplay (dpy);
- DbeGetReq (DbeGetVersion, req, info);
- req->majorVersion = DBE_MAJOR_VERSION;
- req->minorVersion = DBE_MINOR_VERSION;
-
- if (!_XReply (dpy, (xReply *) &rep, 0, xTrue)) {
- UnlockDisplay (dpy);
- SyncHandle ();
- return (Status)0; /* failure */
- }
- *major_version_return = rep.majorVersion;
- *minor_version_return = rep.minorVersion;
- UnlockDisplay (dpy);
-
- SyncHandle ();
-
- if (*major_version_return != DBE_MAJOR_VERSION)
- return (Status)0; /* failure */
- else
- return (Status)1; /* success */
-}
-
-
-/*
- * XdbeAllocateBackBuffer -
- * This function returns a drawable ID used to refer to the back buffer
- * of the specified window. The swap_action is a hint to indicate the
- * swap action that will likely be used in subsequent calls to
- * XdbeSwapBuffers. The actual swap action used in calls to
- * XdbeSwapBuffers does not have to be the same as the swap_action
- * passed to this function, though clients are encouraged to provide
- * accurate information whenever possible.
- */
-
-XdbeBackBuffer XdbeAllocateBackBufferName(
- Display *dpy,
- Window window,
- XdbeSwapAction swap_action)
-{
- XExtDisplayInfo *info = find_display (dpy);
- register xDbeAllocateBackBufferNameReq *req;
- XdbeBackBuffer buffer;
-
- /* make sure extension is available; if not, return the
- * third parameter (0).
- */
- DbeCheckExtension (dpy, info, (XdbeBackBuffer)0);
-
- /* allocate the id */
- buffer = XAllocID (dpy);
-
- LockDisplay(dpy);
- DbeGetReq(DbeAllocateBackBufferName, req, info);
- req->window = window;
- req->swapAction = (unsigned char)swap_action;
- req->buffer = buffer;
-
- UnlockDisplay (dpy);
- SyncHandle ();
- return buffer;
-
-} /* XdbeAllocateBackBufferName() */
-
-/*
- * XdbeDeallocateBackBufferName -
- * This function frees a drawable ID, buffer, that was obtained via
- * XdbeAllocateBackBufferName. The buffer must refer to the back buffer
- * of the specified window, or a protocol error results.
- */
-Status XdbeDeallocateBackBufferName (
- Display *dpy,
- XdbeBackBuffer buffer)
-{
- XExtDisplayInfo *info = find_display (dpy);
- register xDbeDeallocateBackBufferNameReq *req;
-
- DbeCheckExtension (dpy, info, (Status)0 /* failure */);
-
- LockDisplay (dpy);
- DbeGetReq (DbeDeallocateBackBufferName, req, info);
- req->buffer = buffer;
- UnlockDisplay (dpy);
- SyncHandle ();
-
- return (Status)1; /* success */
-}
-
-
-/*
- * XdbeSwapBuffers -
- * This function swaps the front and back buffers for a list of windows.
- * The argument num_windows specifies how many windows are to have their
- * buffers swapped; it is the number of elements in the swap_info array.
- * The argument swap_info specifies the information needed per window
- * to do the swap.
- */
-Status XdbeSwapBuffers (
- Display *dpy,
- XdbeSwapInfo *swap_info,
- int num_windows)
-{
- XExtDisplayInfo *info = find_display (dpy);
- register xDbeSwapBuffersReq *req;
- int i;
-
- DbeCheckExtension (dpy, info, (Status)0 /* failure */);
-
- LockDisplay (dpy);
- DbeGetReq (DbeSwapBuffers, req, info);
- req->length += 2*num_windows;
- req->n = num_windows;
-
- /* We need to handle 64-bit machines, where we can not use PackData32
- * directly because info would be lost in translating from 32- to 64-bit.
- * Instead we send data via a loop that accounts for the translation.
- */
- for (i = 0; i < num_windows; i++)
- {
- char tmp[4];
- Data32 (dpy, (long *)&swap_info[i].swap_window, 4);
- tmp[0] = swap_info[i].swap_action;
- Data (dpy, (char *)tmp, 4);
- }
-
- UnlockDisplay (dpy);
- SyncHandle ();
-
-
- return (Status)1; /* success */
-
-} /* XdbeSwapBuffers() */
-
-
-/*
- * XdbeBeginIdiom -
- * This function marks the beginning of an idiom sequence.
- */
-Status XdbeBeginIdiom (Display *dpy)
-{
- XExtDisplayInfo *info = find_display(dpy);
- register xDbeBeginIdiomReq *req;
-
- DbeCheckExtension (dpy, info, (Status)0 /* failure */);
-
- LockDisplay (dpy);
- DbeGetReq (DbeBeginIdiom, req, info);
- UnlockDisplay (dpy);
- SyncHandle ();
-
- return (Status)1; /* success */
-}
-
-
-/*
- * XdbeEndIdiom -
- * This function marks the end of an idiom sequence.
- */
-Status XdbeEndIdiom (Display *dpy)
-{
- XExtDisplayInfo *info = find_display(dpy);
- register xDbeEndIdiomReq *req;
-
- DbeCheckExtension (dpy, info, (Status)0 /* failure */);
-
- LockDisplay (dpy);
- DbeGetReq (DbeEndIdiom, req, info);
- UnlockDisplay (dpy);
- SyncHandle ();
-
- return (Status)1; /* success */
-}
-
-
-/*
- * XdbeGetVisualInfo -
- * This function returns information about which visuals support
- * double buffering. The argument num_screens specifies how many
- * elements there are in the screen_specifiers list. Each drawable
- * in screen_specifiers designates a screen for which the supported
- * visuals are being requested. If num_screens is zero, information
- * for all screens is requested. In this case, upon return from this
- * function, num_screens will be set to the number of screens that were
- * found. If an error occurs, this function returns NULL, else it returns
- * a pointer to a list of XdbeScreenVisualInfo structures of length
- * num_screens. The nth element in the returned list corresponds to the
- * nth drawable in the screen_specifiers list, unless num_screens was
- * passed in with the value zero, in which case the nth element in the
- * returned list corresponds to the nth screen of the server, starting
- * with screen zero.
- */
-XdbeScreenVisualInfo *XdbeGetVisualInfo (
- Display *dpy,
- Drawable *screen_specifiers,
- int *num_screens) /* SEND and RETURN */
-{
- XExtDisplayInfo *info = find_display(dpy);
- register xDbeGetVisualInfoReq *req;
- xDbeGetVisualInfoReply rep;
- XdbeScreenVisualInfo *scrVisInfo;
- int i;
-
- DbeCheckExtension (dpy, info, (XdbeScreenVisualInfo *)NULL);
-
- LockDisplay (dpy);
-
- DbeGetReq(DbeGetVisualInfo, req, info);
- req->length = 2 + *num_screens;
- req->n = *num_screens;
- Data32 (dpy, screen_specifiers, (*num_screens * sizeof (CARD32)));
-
- if (!_XReply (dpy, (xReply *) &rep, 0, xFalse)) {
- UnlockDisplay (dpy);
- SyncHandle ();
- return NULL;
- }
-
- /* return the number of screens actually found if we
- * requested information about all screens (*num_screens == 0)
- */
- if (*num_screens == 0)
- *num_screens = rep.m;
-
- /* allocate list of visual information to be returned */
- if (!(scrVisInfo =
- (XdbeScreenVisualInfo *)Xmalloc(
- (unsigned)(*num_screens * sizeof(XdbeScreenVisualInfo))))) {
- UnlockDisplay (dpy);
- SyncHandle ();
- return NULL;
- }
-
- for (i = 0; i < *num_screens; i++)
- {
- int nbytes;
- int j;
- long c;
-
- _XRead32 (dpy, &c, sizeof(CARD32));
- scrVisInfo[i].count = c;
-
- nbytes = scrVisInfo[i].count * sizeof(XdbeVisualInfo);
-
- /* if we can not allocate the list of visual/depth info
- * then free the lists that we already allocate as well
- * as the visual info list itself
- */
- if (!(scrVisInfo[i].visinfo = (XdbeVisualInfo *)Xmalloc(
- (unsigned)nbytes))) {
- for (j = 0; j < i; j++) {
- Xfree ((char *)scrVisInfo[j].visinfo);
- }
- Xfree ((char *)scrVisInfo);
- UnlockDisplay (dpy);
- SyncHandle ();
- return NULL;
- }
-
- /* Read the visual info item into the wire structure. Then copy each
- * element into the library structure. The element sizes and/or
- * padding may be different in the two structures.
- */
- for (j = 0; j < scrVisInfo[i].count; j++) {
- xDbeVisInfo xvi;
-
- _XRead (dpy, (char *)&xvi, sizeof(xDbeVisInfo));
- scrVisInfo[i].visinfo[j].visual = xvi.visualID;
- scrVisInfo[i].visinfo[j].depth = xvi.depth;
- scrVisInfo[i].visinfo[j].perflevel = xvi.perfLevel;
- }
-
- }
-
- UnlockDisplay (dpy);
- SyncHandle ();
- return scrVisInfo;
-
-} /* XdbeGetVisualInfo() */
-
-
-/*
- * XdbeFreeVisualInfo -
- * This function frees the list of XdbeScreenVisualInfo returned by the
- * function XdbeGetVisualInfo.
- */
-void XdbeFreeVisualInfo(XdbeScreenVisualInfo *visual_info)
-{
- if (visual_info == NULL) {
- return;
- }
-
- if (visual_info->visinfo) {
- XFree(visual_info->visinfo);
- }
-
- XFree(visual_info);
-}
-
-
-/*
- * XdbeGetBackBufferAttributes -
- * This function returns the attributes associated with the specified
- * buffer.
- */
-XdbeBackBufferAttributes *XdbeGetBackBufferAttributes(
- Display *dpy,
- XdbeBackBuffer buffer)
-{
- XExtDisplayInfo *info = find_display(dpy);
- register xDbeGetBackBufferAttributesReq *req;
- xDbeGetBackBufferAttributesReply rep;
- XdbeBackBufferAttributes *attr;
-
- DbeCheckExtension(dpy, info, (XdbeBackBufferAttributes *)NULL);
-
- if (!(attr =
- (XdbeBackBufferAttributes *)Xmalloc(sizeof(XdbeBackBufferAttributes)))) {
- return NULL;
- }
-
- LockDisplay(dpy);
- DbeGetReq(DbeGetBackBufferAttributes, req, info);
- req->buffer = buffer;
-
- if (!_XReply (dpy, (xReply *) &rep, 0, xTrue)) {
- UnlockDisplay (dpy);
- SyncHandle ();
- Xfree(attr);
- return NULL;
- }
- attr->window = rep.attributes;
-
- UnlockDisplay (dpy);
- SyncHandle ();
-
- return attr;
-}
-
+/* $Xorg: Xdbe.c,v 1.4 2000/08/17 19:45:53 cpqbld Exp $ */
+/******************************************************************************
+ *
+ * Copyright (c) 1994, 1995 Hewlett-Packard Company
+ *
+ * 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 HEWLETT-PACKARD COMPANY 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 Hewlett-Packard
+ * Company 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 Hewlett-Packard Company.
+ *
+ * Xlib DBE code
+ *
+ *****************************************************************************/
+/* $XFree86: xc/lib/Xext/Xdbe.c,v 3.7 2002/10/16 02:19:22 dawes Exp $ */
+
+#define NEED_EVENTS
+#define NEED_REPLIES
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+#include <stdio.h>
+#include <X11/Xlibint.h>
+#include <X11/extensions/Xext.h>
+#include <X11/extensions/extutil.h>
+#include <X11/extensions/Xdbe.h>
+#include <X11/extensions/dbeproto.h>
+
+static XExtensionInfo _dbe_info_data;
+static XExtensionInfo *dbe_info = &_dbe_info_data;
+static char *dbe_extension_name = DBE_PROTOCOL_NAME;
+
+#define DbeCheckExtension(dpy,i,val) \
+ XextCheckExtension (dpy, i, dbe_extension_name, val)
+#define DbeSimpleCheckExtension(dpy,i) \
+ XextSimpleCheckExtension (dpy, i, dbe_extension_name)
+
+#if !defined(UNIXCPP)
+#define DbeGetReq(name,req,info) GetReq (name, req); \
+ req->reqType = info->codes->major_opcode; \
+ req->dbeReqType = X_##name;
+#else
+#define DbeGetReq(name,req,info) GetReq (name, req); \
+ req->reqType = info->codes->major_opcode; \
+ req->dbeReqType = X_/**/name;
+#endif
+
+
+/*****************************************************************************
+ * *
+ * 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 XExtensionHooks dbe_extension_hooks = {
+ NULL, /* create_gc */
+ NULL, /* copy_gc */
+ NULL, /* flush_gc */
+ NULL, /* free_gc */
+ NULL, /* create_font */
+ NULL, /* free_font */
+ close_display, /* close_display */
+ NULL, /* wire_to_event */
+ NULL, /* event_to_wire */
+ NULL, /* error */
+ error_string, /* error_string */
+};
+
+static char *dbe_error_list[] = {
+ "BadBuffer", /* DbeBadBuffer */
+};
+
+static XEXT_GENERATE_FIND_DISPLAY (find_display, dbe_info,
+ dbe_extension_name,
+ &dbe_extension_hooks,
+ DbeNumberEvents, NULL)
+
+static XEXT_GENERATE_CLOSE_DISPLAY (close_display, dbe_info)
+
+static XEXT_GENERATE_ERROR_STRING (error_string, dbe_extension_name,
+ DbeNumberErrors,
+ dbe_error_list)
+
+
+/*****************************************************************************
+ * *
+ * Double-Buffering public interfaces *
+ * *
+ *****************************************************************************/
+
+/*
+ * XdbeQueryExtension -
+ * Sets major_version_return and minor_verion_return to the major and
+ * minor DBE protocol version supported by the server. If the DBE
+ * library is compatible with the version returned by the server, this
+ * function returns non-zero. If dpy does not support the DBE
+ * extension, or if there was an error during communication with the
+ * server, or if the server and library protocol versions are
+ * incompatible, this functions returns zero. No other Xdbe functions
+ * may be called before this function. If a client violates this rule,
+ * the effects of all subsequent Xdbe calls are undefined.
+ */
+Status XdbeQueryExtension (
+ Display *dpy,
+ int *major_version_return,
+ int *minor_version_return)
+{
+ XExtDisplayInfo *info = find_display (dpy);
+ xDbeGetVersionReply rep;
+ register xDbeGetVersionReq *req;
+
+ if (!XextHasExtension (info))
+ return (Status)0; /* failure */
+
+ LockDisplay (dpy);
+ DbeGetReq (DbeGetVersion, req, info);
+ req->majorVersion = DBE_MAJOR_VERSION;
+ req->minorVersion = DBE_MINOR_VERSION;
+
+ if (!_XReply (dpy, (xReply *) &rep, 0, xTrue)) {
+ UnlockDisplay (dpy);
+ SyncHandle ();
+ return (Status)0; /* failure */
+ }
+ *major_version_return = rep.majorVersion;
+ *minor_version_return = rep.minorVersion;
+ UnlockDisplay (dpy);
+
+ SyncHandle ();
+
+ if (*major_version_return != DBE_MAJOR_VERSION)
+ return (Status)0; /* failure */
+ else
+ return (Status)1; /* success */
+}
+
+
+/*
+ * XdbeAllocateBackBuffer -
+ * This function returns a drawable ID used to refer to the back buffer
+ * of the specified window. The swap_action is a hint to indicate the
+ * swap action that will likely be used in subsequent calls to
+ * XdbeSwapBuffers. The actual swap action used in calls to
+ * XdbeSwapBuffers does not have to be the same as the swap_action
+ * passed to this function, though clients are encouraged to provide
+ * accurate information whenever possible.
+ */
+
+XdbeBackBuffer XdbeAllocateBackBufferName(
+ Display *dpy,
+ Window window,
+ XdbeSwapAction swap_action)
+{
+ XExtDisplayInfo *info = find_display (dpy);
+ register xDbeAllocateBackBufferNameReq *req;
+ XdbeBackBuffer buffer;
+
+ /* make sure extension is available; if not, return the
+ * third parameter (0).
+ */
+ DbeCheckExtension (dpy, info, (XdbeBackBuffer)0);
+
+ LockDisplay(dpy);
+ DbeGetReq(DbeAllocateBackBufferName, req, info);
+ req->window = window;
+ req->swapAction = (unsigned char)swap_action;
+ req->buffer = buffer = XAllocID (dpy);
+
+ UnlockDisplay (dpy);
+ SyncHandle ();
+ return buffer;
+
+} /* XdbeAllocateBackBufferName() */
+
+/*
+ * XdbeDeallocateBackBufferName -
+ * This function frees a drawable ID, buffer, that was obtained via
+ * XdbeAllocateBackBufferName. The buffer must refer to the back buffer
+ * of the specified window, or a protocol error results.
+ */
+Status XdbeDeallocateBackBufferName (
+ Display *dpy,
+ XdbeBackBuffer buffer)
+{
+ XExtDisplayInfo *info = find_display (dpy);
+ register xDbeDeallocateBackBufferNameReq *req;
+
+ DbeCheckExtension (dpy, info, (Status)0 /* failure */);
+
+ LockDisplay (dpy);
+ DbeGetReq (DbeDeallocateBackBufferName, req, info);
+ req->buffer = buffer;
+ UnlockDisplay (dpy);
+ SyncHandle ();
+
+ return (Status)1; /* success */
+}
+
+
+/*
+ * XdbeSwapBuffers -
+ * This function swaps the front and back buffers for a list of windows.
+ * The argument num_windows specifies how many windows are to have their
+ * buffers swapped; it is the number of elements in the swap_info array.
+ * The argument swap_info specifies the information needed per window
+ * to do the swap.
+ */
+Status XdbeSwapBuffers (
+ Display *dpy,
+ XdbeSwapInfo *swap_info,
+ int num_windows)
+{
+ XExtDisplayInfo *info = find_display (dpy);
+ register xDbeSwapBuffersReq *req;
+ int i;
+
+ DbeCheckExtension (dpy, info, (Status)0 /* failure */);
+
+ LockDisplay (dpy);
+ DbeGetReq (DbeSwapBuffers, req, info);
+ req->length += 2*num_windows;
+ req->n = num_windows;
+
+ /* We need to handle 64-bit machines, where we can not use PackData32
+ * directly because info would be lost in translating from 32- to 64-bit.
+ * Instead we send data via a loop that accounts for the translation.
+ */
+ for (i = 0; i < num_windows; i++)
+ {
+ char tmp[4];
+ Data32 (dpy, (long *)&swap_info[i].swap_window, 4);
+ tmp[0] = swap_info[i].swap_action;
+ Data (dpy, (char *)tmp, 4);
+ }
+
+ UnlockDisplay (dpy);
+ SyncHandle ();
+
+
+ return (Status)1; /* success */
+
+} /* XdbeSwapBuffers() */
+
+
+/*
+ * XdbeBeginIdiom -
+ * This function marks the beginning of an idiom sequence.
+ */
+Status XdbeBeginIdiom (Display *dpy)
+{
+ XExtDisplayInfo *info = find_display(dpy);
+ register xDbeBeginIdiomReq *req;
+
+ DbeCheckExtension (dpy, info, (Status)0 /* failure */);
+
+ LockDisplay (dpy);
+ DbeGetReq (DbeBeginIdiom, req, info);
+ UnlockDisplay (dpy);
+ SyncHandle ();
+
+ return (Status)1; /* success */
+}
+
+
+/*
+ * XdbeEndIdiom -
+ * This function marks the end of an idiom sequence.
+ */
+Status XdbeEndIdiom (Display *dpy)
+{
+ XExtDisplayInfo *info = find_display(dpy);
+ register xDbeEndIdiomReq *req;
+
+ DbeCheckExtension (dpy, info, (Status)0 /* failure */);
+
+ LockDisplay (dpy);
+ DbeGetReq (DbeEndIdiom, req, info);
+ UnlockDisplay (dpy);
+ SyncHandle ();
+
+ return (Status)1; /* success */
+}
+
+
+/*
+ * XdbeGetVisualInfo -
+ * This function returns information about which visuals support
+ * double buffering. The argument num_screens specifies how many
+ * elements there are in the screen_specifiers list. Each drawable
+ * in screen_specifiers designates a screen for which the supported
+ * visuals are being requested. If num_screens is zero, information
+ * for all screens is requested. In this case, upon return from this
+ * function, num_screens will be set to the number of screens that were
+ * found. If an error occurs, this function returns NULL, else it returns
+ * a pointer to a list of XdbeScreenVisualInfo structures of length
+ * num_screens. The nth element in the returned list corresponds to the
+ * nth drawable in the screen_specifiers list, unless num_screens was
+ * passed in with the value zero, in which case the nth element in the
+ * returned list corresponds to the nth screen of the server, starting
+ * with screen zero.
+ */
+XdbeScreenVisualInfo *XdbeGetVisualInfo (
+ Display *dpy,
+ Drawable *screen_specifiers,
+ int *num_screens) /* SEND and RETURN */
+{
+ XExtDisplayInfo *info = find_display(dpy);
+ register xDbeGetVisualInfoReq *req;
+ xDbeGetVisualInfoReply rep;
+ XdbeScreenVisualInfo *scrVisInfo;
+ int i;
+
+ DbeCheckExtension (dpy, info, (XdbeScreenVisualInfo *)NULL);
+
+ LockDisplay (dpy);
+
+ DbeGetReq(DbeGetVisualInfo, req, info);
+ req->length = 2 + *num_screens;
+ req->n = *num_screens;
+ Data32 (dpy, screen_specifiers, (*num_screens * sizeof (CARD32)));
+
+ if (!_XReply (dpy, (xReply *) &rep, 0, xFalse)) {
+ UnlockDisplay (dpy);
+ SyncHandle ();
+ return NULL;
+ }
+
+ /* return the number of screens actually found if we
+ * requested information about all screens (*num_screens == 0)
+ */
+ if (*num_screens == 0)
+ *num_screens = rep.m;
+
+ /* allocate list of visual information to be returned */
+ if (!(scrVisInfo =
+ (XdbeScreenVisualInfo *)Xmalloc(
+ (unsigned)(*num_screens * sizeof(XdbeScreenVisualInfo))))) {
+ UnlockDisplay (dpy);
+ SyncHandle ();
+ return NULL;
+ }
+
+ for (i = 0; i < *num_screens; i++)
+ {
+ int nbytes;
+ int j;
+ long c;
+
+ _XRead32 (dpy, &c, sizeof(CARD32));
+ scrVisInfo[i].count = c;
+
+ nbytes = scrVisInfo[i].count * sizeof(XdbeVisualInfo);
+
+ /* if we can not allocate the list of visual/depth info
+ * then free the lists that we already allocate as well
+ * as the visual info list itself
+ */
+ if (!(scrVisInfo[i].visinfo = (XdbeVisualInfo *)Xmalloc(
+ (unsigned)nbytes))) {
+ for (j = 0; j < i; j++) {
+ Xfree ((char *)scrVisInfo[j].visinfo);
+ }
+ Xfree ((char *)scrVisInfo);
+ UnlockDisplay (dpy);
+ SyncHandle ();
+ return NULL;
+ }
+
+ /* Read the visual info item into the wire structure. Then copy each
+ * element into the library structure. The element sizes and/or
+ * padding may be different in the two structures.
+ */
+ for (j = 0; j < scrVisInfo[i].count; j++) {
+ xDbeVisInfo xvi;
+
+ _XRead (dpy, (char *)&xvi, sizeof(xDbeVisInfo));
+ scrVisInfo[i].visinfo[j].visual = xvi.visualID;
+ scrVisInfo[i].visinfo[j].depth = xvi.depth;
+ scrVisInfo[i].visinfo[j].perflevel = xvi.perfLevel;
+ }
+
+ }
+
+ UnlockDisplay (dpy);
+ SyncHandle ();
+ return scrVisInfo;
+
+} /* XdbeGetVisualInfo() */
+
+
+/*
+ * XdbeFreeVisualInfo -
+ * This function frees the list of XdbeScreenVisualInfo returned by the
+ * function XdbeGetVisualInfo.
+ */
+void XdbeFreeVisualInfo(XdbeScreenVisualInfo *visual_info)
+{
+ if (visual_info == NULL) {
+ return;
+ }
+
+ if (visual_info->visinfo) {
+ XFree(visual_info->visinfo);
+ }
+
+ XFree(visual_info);
+}
+
+
+/*
+ * XdbeGetBackBufferAttributes -
+ * This function returns the attributes associated with the specified
+ * buffer.
+ */
+XdbeBackBufferAttributes *XdbeGetBackBufferAttributes(
+ Display *dpy,
+ XdbeBackBuffer buffer)
+{
+ XExtDisplayInfo *info = find_display(dpy);
+ register xDbeGetBackBufferAttributesReq *req;
+ xDbeGetBackBufferAttributesReply rep;
+ XdbeBackBufferAttributes *attr;
+
+ DbeCheckExtension(dpy, info, (XdbeBackBufferAttributes *)NULL);
+
+ if (!(attr =
+ (XdbeBackBufferAttributes *)Xmalloc(sizeof(XdbeBackBufferAttributes)))) {
+ return NULL;
+ }
+
+ LockDisplay(dpy);
+ DbeGetReq(DbeGetBackBufferAttributes, req, info);
+ req->buffer = buffer;
+
+ if (!_XReply (dpy, (xReply *) &rep, 0, xTrue)) {
+ UnlockDisplay (dpy);
+ SyncHandle ();
+ Xfree(attr);
+ return NULL;
+ }
+ attr->window = rep.attributes;
+
+ UnlockDisplay (dpy);
+ SyncHandle ();
+
+ return attr;
+}
+