R6.6 is the Xorg base-lineXORG-MAIN

1 files changed, 1977 insertions, 0 deletions

diff --git a/dbe/dbe.c b/dbe/dbe.c
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--- /dev/null
+++ b/dbe/dbe.c
@@ -0,0 +1,1977 @@
+/* $Xorg: dbe.c,v 1.3 2000/08/17 19:48:16 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.
+ * 
+ *     DIX DBE code
+ *
+ *****************************************************************************/
+
+
+/* INCLUDES */
+
+#include "X.h"
+#include "Xproto.h"
+#include "scrnintstr.h"
+#include "extnsionst.h"
+#include "gcstruct.h"
+#include "dixstruct.h"
+#define NEED_DBE_PROTOCOL
+#include "dbestruct.h"
+#include "midbe.h"
+
+
+/* GLOBALS */
+
+/* Per-screen initialization functions [init'ed by DbeRegisterFunction()] */
+static Bool	(* DbeInitFunct[MAXSCREENS])();	/* pScreen, pDbeScreenPriv */
+
+/* These are static globals copied to DBE's screen private for use by DDX */
+static int	dbeScreenPrivIndex;
+static int	dbeWindowPrivIndex;
+
+/* These are static globals copied to DBE's screen private for use by DDX */
+static RESTYPE	dbeDrawableResType;
+static RESTYPE	dbeWindowPrivResType;
+
+/* This global is used by DbeAllocWinPrivPrivIndex() */
+static int	winPrivPrivCount = 0;
+
+/* Used to generate DBE's BadBuffer error. */
+static int	dbeErrorBase;
+
+/* Used by DbeRegisterFunction() to initialize the initialization function
+ * table only once per server lifetime.
+ */
+static Bool	firstRegistrationPass = TRUE;
+
+
+/******************************************************************************
+ *
+ * DBE DIX Procedure: DbeValidateBuffer
+ *
+ * Description:
+ *
+ *     This function is called from VALIDATE_DRAWABLE_AND_GC and from
+ *     various places in dispatch.c if the server has been compiled with
+ *     the flags -DNEED_DBE_BUF_BITS and -DNEED_DBE_BUF_VALIDATE.  
+ *     When pWin->dstBuffer changes, this function will be called with pWin
+ *     as the first argument, the drawable ID that was specified as the
+ *     second argument (could be a back buffer id), and True for the third
+ *     argument.
+ *     When pWin->srcBuffer changes, the third argument will be False, and
+ *     the first two arguments are as described for dstBuffer.
+ *
+ *     This function should prepare the hardware to access the specified
+ *     buffer for reads (if dstbuf is False) or writes (if dstbuf is True).
+ *
+ *****************************************************************************/
+
+void
+DbeValidateBuffer(pWin, drawID, dstbuf)
+    WindowPtr pWin;
+    XID drawID;
+    Bool dstbuf;
+{
+    DbeScreenPrivPtr pDbeScreenPriv = DBE_SCREEN_PRIV_FROM_WINDOW(pWin);
+    if (pDbeScreenPriv->ValidateBuffer)
+	(*pDbeScreenPriv->ValidateBuffer)(pWin, drawID, dstbuf);
+}
+
+
+/******************************************************************************
+ *
+ * DBE DIX Procedure: DbeRegisterFunction
+ *
+ * Description:
+ *
+ *     This function registers the DBE init function for the specified screen.
+ *
+ *****************************************************************************/
+
+void
+DbeRegisterFunction(pScreen, funct)
+    ScreenPtr	pScreen;
+    Bool	(*funct)();
+{
+    int	i;
+
+    /* Initialize the initialization function table if it has not been
+     * initialized already.
+     */
+    if (firstRegistrationPass)
+    {
+        for (i = 0; i < MAXSCREENS; i++)
+        {
+            DbeInitFunct[i] = NULL;
+        }
+
+        firstRegistrationPass = FALSE;
+    }
+
+    DbeInitFunct[pScreen->myNum] = funct;
+
+} /* DbeRegisterFunction() */
+
+
+/******************************************************************************
+ *
+ * DBE DIX Procedure: DbeAllocWinPriv
+ *
+ * Description:
+ *
+ *     This function was cloned from AllocateWindow() in window.c.
+ *     This function allocates a window priv structure to be associated 
+ *     with a double-buffered window.
+ *
+ *****************************************************************************/
+static DbeWindowPrivPtr
+DbeAllocWinPriv(pScreen)
+    ScreenPtr	pScreen;
+{
+    DbeWindowPrivPtr		pDbeWindowPriv;
+    DbeScreenPrivPtr		pDbeScreenPriv;
+    register char		*ptr;
+    register DevUnion		*ppriv;
+    register unsigned int	*sizes;
+    register unsigned int	size;
+    register int		i;
+
+    pDbeScreenPriv = DBE_SCREEN_PRIV(pScreen);
+    pDbeWindowPriv = (DbeWindowPrivPtr)xalloc(pDbeScreenPriv->totalWinPrivSize);
+
+    if (pDbeWindowPriv)
+    {
+        ppriv = (DevUnion *)(pDbeWindowPriv + 1);
+        pDbeWindowPriv->devPrivates = ppriv;
+        sizes = pDbeScreenPriv->winPrivPrivSizes;
+        ptr = (char *)(ppriv + pDbeScreenPriv->winPrivPrivLen);
+        for (i = pDbeScreenPriv->winPrivPrivLen; --i >= 0; ppriv++, sizes++)
+        {
+            if (size = *sizes)
+            {
+                ppriv->ptr = (pointer)ptr;
+                ptr += size;
+            }
+            else
+                ppriv->ptr = (pointer)NULL;
+        }
+    }
+
+    return(pDbeWindowPriv);
+
+} /* DbeAllocWinPriv() */
+
+
+/******************************************************************************
+ *
+ * DBE DIX Procedure: DbeFallbackAllocWinPriv
+ *
+ * Description:
+ *
+ *     This is a fallback function for AllocWinPriv().
+ *
+ *****************************************************************************/
+
+static DbeWindowPrivPtr
+DbeFallbackAllocWinPriv(pScreen)
+    ScreenPtr	pScreen;
+{
+    return (NULL);
+
+} /* DbeFallbackAllocWinPriv() */
+
+
+/******************************************************************************
+ *
+ * DBE DIX Procedure: DbeAllocWinPrivPrivIndex
+ *
+ * Description:
+ *
+ *     This function was cloned from AllocateWindowPrivateIndex() in window.c.
+ *     This function allocates a new window priv priv index by simply returning
+ *     an incremented private counter.
+ *
+ *****************************************************************************/
+
+static int
+DbeAllocWinPrivPrivIndex()
+{
+    return winPrivPrivCount++;
+
+} /* DbeAllocWinPrivPrivIndex() */
+
+
+/******************************************************************************
+ *
+ * DBE DIX Procedure: DbeAllocWinPrivPriv
+ *
+ * Description:
+ *
+ *     This function was cloned from AllocateWindowPrivate() in privates.c.
+ *     This function allocates a private structure to be hung off
+ *     a window private.
+ *
+ *****************************************************************************/
+
+static Bool
+DbeAllocWinPrivPriv(pScreen, index, amount)
+    register ScreenPtr	pScreen;
+    int			index;
+    unsigned int	amount;
+{
+    DbeScreenPrivPtr	pDbeScreenPriv;
+    unsigned int	oldamount;
+
+
+    pDbeScreenPriv = DBE_SCREEN_PRIV(pScreen);
+
+    if (index >= pDbeScreenPriv->winPrivPrivLen)
+    {
+	unsigned *nsizes;
+	nsizes = (unsigned *)xrealloc(pDbeScreenPriv->winPrivPrivSizes,
+				      (index + 1) * sizeof(unsigned));
+	if (!nsizes)
+        {
+	    return(FALSE);
+        }
+
+	while (pDbeScreenPriv->winPrivPrivLen <= index)
+	{
+	    nsizes[pDbeScreenPriv->winPrivPrivLen++] = 0;
+	    pDbeScreenPriv->totalWinPrivSize += sizeof(DevUnion);
+	}
+
+	pDbeScreenPriv->winPrivPrivSizes = nsizes;
+    }
+
+    oldamount = pDbeScreenPriv->winPrivPrivSizes[index];
+
+    if (amount > oldamount)
+    {
+	pDbeScreenPriv->winPrivPrivSizes[index] = amount;
+	pDbeScreenPriv->totalWinPrivSize += (amount - oldamount);
+    }
+    return(TRUE);
+
+} /* DbeAllocWinPrivPriv() */
+
+
+/******************************************************************************
+ *
+ * DBE DIX Procedure: DbeStubScreen
+ *
+ * Description:
+ *
+ *     This is function stubs the function pointers in the given DBE screen
+ *     private and increments the number of stubbed screens.
+ *
+ *****************************************************************************/
+
+static void
+DbeStubScreen(pDbeScreenPriv, nStubbedScreens)
+    DbeScreenPrivPtr	pDbeScreenPriv;
+    int			*nStubbedScreens;
+{
+    /* Stub DIX. */
+    pDbeScreenPriv->SetupBackgroundPainter = NULL;
+    pDbeScreenPriv->AllocWinPriv           = NULL;
+    pDbeScreenPriv->AllocWinPrivPrivIndex  = NULL;
+    pDbeScreenPriv->AllocWinPrivPriv       = NULL;
+
+    /* Do not unwrap PositionWindow nor DestroyWindow.  If the DDX
+     * initialization function failed, we assume that it did not wrap
+     * PositionWindow.  Also, DestroyWindow is only wrapped if the DDX
+     * initialization function succeeded.
+     */
+
+    /* Stub DDX. */
+    pDbeScreenPriv->GetVisualInfo       = NULL;
+    pDbeScreenPriv->AllocBackBufferName = NULL;
+    pDbeScreenPriv->SwapBuffers         = NULL;
+    pDbeScreenPriv->BeginIdiom          = NULL;
+    pDbeScreenPriv->EndIdiom            = NULL;
+    pDbeScreenPriv->WinPrivDelete       = NULL;
+    pDbeScreenPriv->ResetProc           = NULL;
+    pDbeScreenPriv->ValidateBuffer	= NULL;
+
+    (*nStubbedScreens)++;
+
+} /* DbeStubScreen() */
+
+
+
+/******************************************************************************
+ *
+ * DBE DIX Procedure: ProcDbeGetVersion
+ *
+ * Description:
+ *
+ *     This function is for processing a DbeGetVersion request.
+ *     This request returns the major and minor version numbers of this
+ *     extension.
+ *
+ * Return Values:
+ *
+ *     Success
+ *
+ *****************************************************************************/
+
+static int
+ProcDbeGetVersion(client)
+    ClientPtr client;
+{
+    REQUEST(xDbeGetVersionReq);
+    xDbeGetVersionReply	rep;
+    register int	n;
+
+
+    REQUEST_SIZE_MATCH(xDbeGetVersionReq);
+
+    rep.type           = X_Reply;
+    rep.length         = 0;
+    rep.sequenceNumber = client->sequence;
+    rep.majorVersion   = DBE_MAJOR_VERSION;
+    rep.minorVersion   = DBE_MINOR_VERSION;
+
+    if (client->swapped)
+    {
+        swaps(&rep.sequenceNumber, n);
+    }
+
+    WriteToClient(client, sizeof(xDbeGetVersionReply), (char *)&rep);
+
+    return(client->noClientException);
+
+} /* ProcDbeGetVersion() */
+
+
+/******************************************************************************
+ *
+ * DBE DIX Procedure: ProcDbeAllocateBackBufferName
+ *
+ * Description:
+ *
+ *     This function is for processing a DbeAllocateBackBufferName request.
+ *     This request allocates a drawable ID used to refer to the back buffer
+ *     of a window.
+ *
+ * Return Values:
+ *
+ *     BadAlloc    - server can not allocate resources
+ *     BadIDChoice - id is out of range for client; id is already in use
+ *     BadMatch    - window is not an InputOutput window;
+ *                   visual of window is not on list returned by
+ *                   DBEGetVisualInfo; 
+ *     BadValue    - invalid swap action is specified
+ *     BadWindow   - window is not a valid window
+ *     Success
+ *
+ *****************************************************************************/
+
+static int
+ProcDbeAllocateBackBufferName(client)
+    ClientPtr client;
+{
+    REQUEST(xDbeAllocateBackBufferNameReq);
+    WindowPtr			pWin;
+    DbeScreenPrivPtr		pDbeScreenPriv;
+    DbeWindowPrivPtr		pDbeWindowPriv;
+    XdbeScreenVisualInfo	scrVisInfo;
+    register int		i;
+    Bool			visualMatched = FALSE;
+    xDbeSwapAction		swapAction;
+    VisualID			visual;
+    int				status;
+
+
+    REQUEST_SIZE_MATCH(xDbeAllocateBackBufferNameReq);
+
+    /* The window must be valid. */
+    if (!(pWin = SecurityLookupWindow(stuff->window, client,
+				      SecurityWriteAccess)))
+    {
+	return(BadWindow);
+    }
+
+    /* The window must be InputOutput. */
+    if (pWin->drawable.class != InputOutput)
+    {
+	return(BadMatch);
+    }
+
+    /* The swap action must be valid. */
+    swapAction = stuff->swapAction;	/* use local var for performance. */
+    if ((swapAction != XdbeUndefined ) &&
+        (swapAction != XdbeBackground) &&
+        (swapAction != XdbeUntouched ) &&
+        (swapAction != XdbeCopied    ))
+    {
+        return(BadValue);
+    }
+
+    /* The id must be in range and not already in use. */
+    LEGAL_NEW_RESOURCE(stuff->buffer, client);
+
+    /* The visual of the window must be in the list returned by
+     * GetVisualInfo.
+     */
+    pDbeScreenPriv = DBE_SCREEN_PRIV_FROM_WINDOW(pWin);
+    if (!pDbeScreenPriv->GetVisualInfo)
+	return(BadMatch); /* screen doesn't support double buffering */
+
+    if (!(*pDbeScreenPriv->GetVisualInfo)(pWin->drawable.pScreen, &scrVisInfo))
+    {
+        /* GetVisualInfo() failed to allocate visual info data. */
+        return(BadAlloc);
+    }
+
+    /* See if the window's visual is on the list. */
+    visual = wVisual(pWin);
+    for (i = 0; (i < scrVisInfo.count) && !visualMatched; i++)
+    {
+        if (scrVisInfo.visinfo[i].visual == visual)
+	{
+	    visualMatched = TRUE;
+	}
+    }
+
+    /* Free what was allocated by the GetVisualInfo() call above. */
+    xfree(scrVisInfo.visinfo);
+
+    if (!visualMatched)
+    {
+	return(BadMatch);
+    }
+
+    if ((pDbeWindowPriv = DBE_WINDOW_PRIV(pWin)) == NULL)
+    {
+        /* There is no buffer associated with the window.
+         * Allocate a window priv.
+         */
+
+        if (!(pDbeWindowPriv =
+            (*pDbeScreenPriv->AllocWinPriv)(pWin->drawable.pScreen)))
+        {
+            return(BadAlloc);
+        }
+
+        /* Make the window priv a DBE window priv resource. */
+        if (!AddResource(stuff->buffer, dbeWindowPrivResType,
+            (pointer)pDbeWindowPriv))
+        {
+            xfree(pDbeWindowPriv);
+            return(BadAlloc);
+        }
+
+        /* Fill out window priv information. */
+        pDbeWindowPriv->pWindow      = pWin;
+        pDbeWindowPriv->width        = pWin->drawable.width;
+        pDbeWindowPriv->height       = pWin->drawable.height;
+        pDbeWindowPriv->x            = pWin->drawable.x;
+        pDbeWindowPriv->y            = pWin->drawable.y;
+        pDbeWindowPriv->nBufferIDs   = 0;
+
+        /* Set the buffer ID array pointer to the initial (static) array). */
+        pDbeWindowPriv->IDs = pDbeWindowPriv->initIDs;
+
+        /* Initialize the buffer ID list. */ 
+        pDbeWindowPriv->maxAvailableIDs = DBE_INIT_MAX_IDS;
+        pDbeWindowPriv->IDs[0] = stuff->buffer;
+        for (i = 1; i < DBE_INIT_MAX_IDS; i++)
+        {
+            pDbeWindowPriv->IDs[i] = DBE_FREE_ID_ELEMENT;
+        }
+
+
+        /* Actually connect the window priv to the window. */
+        pWin->devPrivates[dbeWindowPrivIndex].ptr = (pointer)pDbeWindowPriv;
+
+    } /* if -- There is no buffer associated with the window. */
+
+    else
+    {
+        /* A buffer is already associated with the window.
+         * Add the new buffer ID to the array, reallocating the array memory
+         * if necessary.
+         */
+
+        /* Determine if there is a free element in the ID array. */
+        for (i = 0; i < pDbeWindowPriv->maxAvailableIDs; i++)
+        {
+            if (pDbeWindowPriv->IDs[i] == DBE_FREE_ID_ELEMENT)
+            {
+                /* There is still room in the ID array. */
+                break;
+            }
+        }
+ 
+        if (i == pDbeWindowPriv->maxAvailableIDs)
+        {
+            /* No more room in the ID array -- reallocate another array. */
+            XID	*pIDs;
+
+
+            /* Setup an array pointer for the realloc operation below. */
+            if (pDbeWindowPriv->maxAvailableIDs == DBE_INIT_MAX_IDS)
+            {
+                /* We will malloc a new array. */
+                pIDs = NULL;
+            }
+            else
+            {
+                /* We will realloc a new array. */
+                pIDs = pDbeWindowPriv->IDs;
+            }
+
+            /* malloc/realloc a new array and initialize all elements to 0. */
+            pDbeWindowPriv->IDs = (XID *)xrealloc(pIDs,
+                (pDbeWindowPriv->maxAvailableIDs+DBE_INCR_MAX_IDS)*sizeof(XID));
+            if (!pDbeWindowPriv->IDs)
+            {
+                return(BadAlloc);
+            }
+            memset(&pDbeWindowPriv->IDs[pDbeWindowPriv->nBufferIDs], 0,
+                   (pDbeWindowPriv->maxAvailableIDs + DBE_INCR_MAX_IDS -
+                    pDbeWindowPriv->nBufferIDs) * sizeof(XID));
+
+            if (pDbeWindowPriv->maxAvailableIDs == DBE_INIT_MAX_IDS)
+            {
+                /* We just went from using the initial (static) array to a
+                 * newly allocated array.  Copy the IDs from the initial array
+                 * to the new array.
+                 */
+                memcpy(pDbeWindowPriv->IDs, pDbeWindowPriv->initIDs,
+                       DBE_INIT_MAX_IDS * sizeof(XID));
+            }
+
+            pDbeWindowPriv->maxAvailableIDs += DBE_INCR_MAX_IDS;
+        }
+
+        /* Finally, record the buffer ID in the array. */
+        pDbeWindowPriv->IDs[i] = stuff->buffer;
+
+        /* Associate the new ID with an existing window priv. */
+        if (!AddResource(stuff->buffer, dbeWindowPrivResType,
+                         (pointer)pDbeWindowPriv))
+        {
+            pDbeWindowPriv->IDs[i] = DBE_FREE_ID_ELEMENT;
+            return(BadAlloc);
+        }
+
+    } /* else -- A buffer is already associated with the window. */
+
+
+    /* Call the DDX routine to allocate the back buffer. */
+    status = (*pDbeScreenPriv->AllocBackBufferName)(pWin, stuff->buffer,
+                                                    stuff->swapAction);
+
+    if ((status != Success) && (pDbeWindowPriv->nBufferIDs == 0))
+    {
+        /* The DDX buffer allocation routine failed for the first buffer of
+         * this window.
+         */
+        xfree(pDbeWindowPriv);
+        return(status);
+    }
+
+    /* Increment the number of buffers (XIDs) associated with this window. */
+    pDbeWindowPriv->nBufferIDs++;
+
+    /* Set swap action on all calls. */
+    pDbeWindowPriv->swapAction = stuff->swapAction;
+
+
+    return(status);
+
+} /* ProcDbeAllocateBackBufferName() */
+
+
+/******************************************************************************
+ *
+ * DBE DIX Procedure: ProcDbeDeallocateBackBufferName
+ *
+ * Description:
+ *
+ *     This function is for processing a DbeDeallocateBackBufferName request.
+ *     This request frees a drawable ID that was obtained by a
+ *     DbeAllocateBackBufferName request.
+ *
+ * Return Values:
+ *
+ *     BadBuffer - buffer to deallocate is not associated with a window
+ *     Success
+ *
+ *****************************************************************************/
+
+static int
+ProcDbeDeallocateBackBufferName(client)
+    ClientPtr	client;
+{
+    REQUEST(xDbeDeallocateBackBufferNameReq);
+    DbeWindowPrivPtr	pDbeWindowPriv;
+    int			i;
+
+
+    REQUEST_SIZE_MATCH(xDbeDeallocateBackBufferNameReq);
+
+    /* Buffer name must be valid */
+    if (!(pDbeWindowPriv = (DbeWindowPrivPtr)SecurityLookupIDByType(client,
+		stuff->buffer, dbeWindowPrivResType, SecurityDestroyAccess)) ||
+        !(SecurityLookupIDByType(client, stuff->buffer, dbeDrawableResType,
+				 SecurityDestroyAccess)))
+    {
+        client->errorValue = stuff->buffer;
+        return(dbeErrorBase + DbeBadBuffer);
+    }
+
+    /* Make sure that the id is valid for the window.
+     * This is paranoid code since we already looked up the ID by type
+     * above.
+     */
+
+    for (i = 0; i < pDbeWindowPriv->nBufferIDs; i++)
+    {
+        /* Loop through the ID list to find the ID. */
+        if (pDbeWindowPriv->IDs[i] == stuff->buffer)
+        {
+            break;
+        }
+    }
+
+    if (i == pDbeWindowPriv->nBufferIDs)
+    {
+        /* We did not find the ID in the ID list. */
+        client->errorValue = stuff->buffer;
+        return(dbeErrorBase + DbeBadBuffer);
+    }
+
+    FreeResource(stuff->buffer, RT_NONE);
+
+    return(Success);
+
+} /* ProcDbeDeallocateBackBufferName() */
+
+
+/******************************************************************************
+ *
+ * DBE DIX Procedure: ProcDbeSwapBuffers
+ *
+ * Description:
+ *
+ *     This function is for processing a DbeSwapBuffers request.
+ *     This request swaps the buffers for all windows listed, applying the
+ *     appropriate swap action for each window.
+ *
+ * Return Values:
+ *
+ *     BadAlloc  - local allocation failed; this return value is not defined
+ *                 by the protocol
+ *     BadMatch  - a window in request is not double-buffered; a window in
+ *                 request is listed more than once
+ *     BadValue  - invalid swap action is specified; no swap action is
+ *                 specified
+ *     BadWindow - a window in request is not valid
+ *     Success
+ *
+ *****************************************************************************/
+
+static int
+ProcDbeSwapBuffers(client)
+    ClientPtr client;
+{
+    REQUEST(xDbeSwapBuffersReq);
+    WindowPtr		pWin;
+    DbeScreenPrivPtr	pDbeScreenPriv;
+    DbeSwapInfoPtr	swapInfo;
+    xDbeSwapInfo	*dbeSwapInfo;
+    int			error;
+    register int	i, j;
+    int			nStuff;
+
+
+    REQUEST_AT_LEAST_SIZE(xDbeSwapBuffersReq);
+    nStuff = stuff->n;	/* use local variable for performance. */
+
+    if (nStuff == 0)
+    {
+        return(Success);
+    }
+
+    /* Get to the swap info appended to the end of the request. */
+    dbeSwapInfo = (xDbeSwapInfo *)&stuff[1];
+
+    /* Allocate array to record swap information. */ 
+    swapInfo = (DbeSwapInfoPtr)ALLOCATE_LOCAL(nStuff * sizeof(DbeSwapInfoRec));
+    if (swapInfo == NULL)
+    {
+        return(BadAlloc);
+    }
+
+
+    for (i = 0; i < nStuff; i++)
+    {
+        /* Check all windows to swap. */
+
+        /* Each window must be a valid window - BadWindow. */
+        if (!(pWin = SecurityLookupWindow(dbeSwapInfo[i].window, client,
+					  SecurityWriteAccess)))
+        {
+            DEALLOCATE_LOCAL(swapInfo);
+	    return(BadWindow);
+        }
+
+        /* Each window must be double-buffered - BadMatch. */
+        if (DBE_WINDOW_PRIV(pWin) == NULL)
+        {
+            DEALLOCATE_LOCAL(swapInfo);
+            return(BadMatch);
+        }
+
+        /* Each window must only be specified once - BadMatch. */
+        for (j = i + 1; j < nStuff; j++)
+        {
+            if (dbeSwapInfo[i].window == dbeSwapInfo[j].window)
+            {
+                DEALLOCATE_LOCAL(swapInfo);
+                return(BadMatch);
+	    }
+        }
+
+        /* Each swap action must be valid - BadValue. */
+        if ((dbeSwapInfo[i].swapAction != XdbeUndefined ) &&
+            (dbeSwapInfo[i].swapAction != XdbeBackground) &&
+            (dbeSwapInfo[i].swapAction != XdbeUntouched ) &&
+            (dbeSwapInfo[i].swapAction != XdbeCopied    ))
+        {
+            DEALLOCATE_LOCAL(swapInfo);
+            return(BadValue);
+        }
+
+        /* Everything checks out OK.  Fill in the swap info array. */
+        swapInfo[i].pWindow    = pWin;     
+        swapInfo[i].swapAction = dbeSwapInfo[i].swapAction;     
+
+    } /* for (i = 0; i < nStuff; i++) */
+
+
+    /* Call the DDX routine to perform the swap(s).  The DDX routine should
+     * scan the swap list (swap info), swap any buffers that it knows how to
+     * handle, delete them from the list, and update nStuff to indicate how
+     * many windows it did not handle.
+     *
+     * This scheme allows a range of sophistication in the DDX SwapBuffers()
+     * implementation.  Naive implementations could just swap the first buffer
+     * in the list, move the last buffer to the front, decrement nStuff, and
+     * return.  The next level of sophistication could be to scan the whole
+     * list for windows on the same screen.  Up another level, the DDX routine
+     * could deal with cross-screen synchronization.
+     */
+
+    while (nStuff > 0)
+    {
+        pDbeScreenPriv = DBE_SCREEN_PRIV_FROM_WINDOW(swapInfo[0].pWindow);
+        error = (*pDbeScreenPriv->SwapBuffers)(client, &nStuff, swapInfo);
+        if (error != Success)
+        {
+            DEALLOCATE_LOCAL(swapInfo);
+            return(error);
+        }
+    }
+    
+    DEALLOCATE_LOCAL(swapInfo);
+    return(Success);
+
+} /* ProcDbeSwapBuffers() */
+
+
+/******************************************************************************
+ *
+ * DBE DIX Procedure: ProcDbeBeginIdiom
+ *
+ * Description:
+ *
+ *     This function is for processing a DbeBeginIdiom request.
+ *     This request informs the server that a complex swap will immediately
+ *     follow this request.
+ *
+ * Return Values:
+ *
+ *     Success
+ *
+ *****************************************************************************/
+
+static int
+ProcDbeBeginIdiom(client)
+    ClientPtr client;
+{
+    REQUEST(xDbeBeginIdiomReq);
+    DbeScreenPrivPtr	pDbeScreenPriv;
+    register int	i;
+
+
+    REQUEST_SIZE_MATCH(xDbeBeginIdiomReq);
+
+    for (i = 0; i < screenInfo.numScreens; i++)
+    {
+        pDbeScreenPriv = DBE_SCREEN_PRIV(screenInfo.screens[i]);
+
+        /* Call the DDX begin idiom procedure if there is one. */
+        if (pDbeScreenPriv->BeginIdiom)
+        {
+           (*pDbeScreenPriv->BeginIdiom)(client);
+        }
+    }
+
+    return(Success);
+
+} /* ProcDbeBeginIdiom() */
+
+
+/******************************************************************************
+ *
+ * DBE DIX Procedure: ProcDbeGetVisualInfo
+ *
+ * Description:
+ *
+ *     This function is for processing a ProcDbeGetVisualInfo request.
+ *     This request returns information about which visuals support
+ *     double buffering.
+ *
+ * Return Values:
+ *
+ *     BadDrawable - value in screen specifiers is not a valid drawable
+ *     Success
+ *
+ *****************************************************************************/
+
+static int
+ProcDbeGetVisualInfo(client)
+    ClientPtr client;
+{
+    REQUEST(xDbeGetVisualInfoReq);
+    DbeScreenPrivPtr		pDbeScreenPriv;
+    xDbeGetVisualInfoReply	rep;
+    Drawable			*drawables;
+    DrawablePtr			*pDrawables = NULL;
+    register int		i, j, n;
+    register int		count;  /* number of visual infos in reply */
+    register int		length; /* length of reply */
+    ScreenPtr			pScreen;
+    XdbeScreenVisualInfo	*pScrVisInfo;
+
+
+    REQUEST_AT_LEAST_SIZE(xDbeGetVisualInfoReq);
+
+    /* Make sure any specified drawables are valid. */
+    if (stuff->n != 0)
+    {
+        if (!(pDrawables = (DrawablePtr *)ALLOCATE_LOCAL(stuff->n *
+                                                 sizeof(DrawablePtr))))
+        {
+            return(BadAlloc);
+        }
+
+        drawables = (Drawable *)&stuff[1];
+
+        for (i = 0; i < stuff->n; i++)
+        {
+            if (!(pDrawables[i] = (DrawablePtr)SecurityLookupDrawable(
+				drawables[i], client, SecurityReadAccess)))
+            {
+                DEALLOCATE_LOCAL(pDrawables);
+                return(BadDrawable);
+            }
+        }
+    }
+
+    count = (stuff->n == 0) ? screenInfo.numScreens : stuff->n;
+    if (!(pScrVisInfo = (XdbeScreenVisualInfo *)xalloc(count *
+                        sizeof(XdbeScreenVisualInfo))))
+    {
+        if (pDrawables)
+        {
+            DEALLOCATE_LOCAL(pDrawables);
+        }
+
+        return(BadAlloc);
+    }
+
+    length = 0;
+
+    for (i = 0; i < count; i++)
+    {
+        pScreen = (stuff->n == 0) ? screenInfo.screens[i] :
+                                    pDrawables[i]->pScreen;
+        pDbeScreenPriv = DBE_SCREEN_PRIV(pScreen);
+
+        if (!(*pDbeScreenPriv->GetVisualInfo)(pScreen, &pScrVisInfo[i]))
+        {
+            /* We failed to alloc pScrVisInfo[i].visinfo. */
+
+            /* Free visinfos that we allocated for previous screen infos.*/
+            for (j = 0; j < i; j++)
+            {
+                xfree(pScrVisInfo[j].visinfo);
+            }
+
+            /* Free pDrawables if we needed to allocate it above. */
+            if (pDrawables)
+            {
+                DEALLOCATE_LOCAL(pDrawables);
+            }
+
+            return(BadAlloc);
+        }
+
+        /* Account for n, number of xDbeVisInfo items in list. */
+        length += sizeof(CARD32);
+
+        /* Account for n xDbeVisInfo items */
+        length += pScrVisInfo[i].count * sizeof(xDbeVisInfo);
+    }
+
+    rep.type           = X_Reply;
+    rep.sequenceNumber = client->sequence;
+    rep.length         = length;
+    rep.m              = count;
+
+    if (client->swapped)
+    {
+        swaps(&rep.sequenceNumber, n);
+        swapl(&rep.length, n);
+        swapl(&rep.m, n);
+    }
+
+    /* Send off reply. */
+    WriteToClient(client, sizeof(xDbeGetVisualInfoReply), (char *)&rep);
+
+    for (i = 0; i < count; i++)
+    {
+        CARD32	data32;
+
+        /* For each screen in the reply, send off the visual info */
+
+        /* Send off number of visuals. */
+        data32 = (CARD32)pScrVisInfo[i].count;
+
+        if (client->swapped)
+        {
+            swapl(&data32, n);
+        }
+
+        WriteToClient(client, sizeof(CARD32), (char *)&data32);
+
+        /* Now send off visual info items. */
+        for (j = 0; j < pScrVisInfo[i].count; j++)
+        {
+            xDbeVisInfo		visInfo;
+
+            /* Copy the data in the client data structure to a protocol
+             * data structure.  We will send data to the client from the
+             * protocol data structure.
+             */
+
+            visInfo.visualID  = (CARD32)pScrVisInfo[i].visinfo[j].visual;
+            visInfo.depth     = (CARD8) pScrVisInfo[i].visinfo[j].depth;
+            visInfo.perfLevel = (CARD8) pScrVisInfo[i].visinfo[j].perflevel;
+
+            if (client->swapped)
+            {
+                swapl(&visInfo.visualID, n);
+
+                /* We do not need to swap depth and perfLevel since they are
+                 * already 1 byte quantities.
+                 */
+            }
+
+            /* Write visualID(32), depth(8), perfLevel(8), and pad(16). */
+            WriteToClient(client, 2*sizeof(CARD32), (char *)&visInfo.visualID);
+        }
+    }
+
+    /* Clean up memory. */
+    for (i = 0; i < count; i++)
+    {
+        xfree(pScrVisInfo[i].visinfo);
+    }
+    xfree(pScrVisInfo);
+
+    if (pDrawables)
+    {
+        DEALLOCATE_LOCAL(pDrawables);
+    }
+
+    return(client->noClientException);
+
+} /* ProcDbeGetVisualInfo() */
+
+
+/******************************************************************************
+ *
+ * DBE DIX Procedure: ProcDbeGetbackBufferAttributes
+ *
+ * Description:
+ *
+ *     This function is for processing a ProcDbeGetbackBufferAttributes
+ *     request.  This request returns information about a back buffer.
+ *
+ * Return Values:
+ *
+ *     Success
+ *
+ *****************************************************************************/
+
+static int
+ProcDbeGetBackBufferAttributes(client)
+    ClientPtr client;
+{
+    REQUEST(xDbeGetBackBufferAttributesReq);
+    xDbeGetBackBufferAttributesReply	rep;
+    DbeWindowPrivPtr			pDbeWindowPriv;
+    int					n;
+
+
+    REQUEST_SIZE_MATCH(xDbeGetBackBufferAttributesReq);
+
+    if (!(pDbeWindowPriv = (DbeWindowPrivPtr)SecurityLookupIDByType(client,
+		stuff->buffer, dbeWindowPrivResType, SecurityReadAccess)))
+    {
+        rep.attributes = None;
+    }
+    else
+    {
+        rep.attributes = pDbeWindowPriv->pWindow->drawable.id;
+    }
+        
+    rep.type           = X_Reply;
+    rep.sequenceNumber = client->sequence;
+    rep.length         = 0;
+    
+    if (client->swapped)
+    {
+        swaps(&rep.sequenceNumber, n);
+        swapl(&rep.length, n);
+        swapl(&rep.attributes, n);
+    }
+
+    WriteToClient(client, sizeof(xDbeGetBackBufferAttributesReply),
+                  (char *)&rep);
+    return(client->noClientException);
+
+} /* ProcDbeGetbackBufferAttributes() */
+
+
+/******************************************************************************
+ *
+ * DBE DIX Procedure: ProcDbeDispatch
+ *
+ * Description:
+ *
+ *     This function dispatches DBE requests.
+ *
+ *****************************************************************************/
+
+static int
+ProcDbeDispatch(client)
+    ClientPtr client;
+{
+    REQUEST(xReq);
+
+
+    switch (stuff->data)
+    {
+        case X_DbeGetVersion:
+            return(ProcDbeGetVersion(client));
+
+        case X_DbeAllocateBackBufferName:
+            return(ProcDbeAllocateBackBufferName(client));
+
+        case X_DbeDeallocateBackBufferName:
+            return(ProcDbeDeallocateBackBufferName(client));
+
+        case X_DbeSwapBuffers:
+            return(ProcDbeSwapBuffers(client));
+
+        case X_DbeBeginIdiom:
+            return(ProcDbeBeginIdiom(client));
+
+        case X_DbeEndIdiom:
+            return(Success);
+
+        case X_DbeGetVisualInfo:
+            return(ProcDbeGetVisualInfo(client));
+
+        case X_DbeGetBackBufferAttributes:
+            return(ProcDbeGetBackBufferAttributes(client));
+
+        default:
+            return(BadRequest);
+    }
+
+} /* ProcDbeDispatch() */
+
+
+/******************************************************************************
+ *
+ * DBE DIX Procedure: SProcDbeGetVersion
+ *
+ * Description:
+ *
+ *     This function is for processing a DbeGetVersion request on a swapped
+ *     server.  This request returns the major and minor version numbers of
+ *     this extension.
+ *
+ * Return Values:
+ *
+ *     Success
+ *
+ *****************************************************************************/
+
+static int
+SProcDbeGetVersion(client)
+    ClientPtr client;
+{
+    REQUEST(xDbeGetVersionReq);
+    register int	n;
+
+
+    swaps(&stuff->length, n);
+    return(ProcDbeGetVersion(client));
+
+} /* SProcDbeGetVersion() */
+
+
+/******************************************************************************
+ *
+ * DBE DIX Procedure: SProcDbeAllocateBackBufferName
+ *
+ * Description:
+ *
+ *     This function is for processing a DbeAllocateBackBufferName request on
+ *     a swapped server.  This request allocates a drawable ID used to refer
+ *     to the back buffer of a window.
+ *
+ * Return Values:
+ *
+ *     BadAlloc    - server can not allocate resources
+ *     BadIDChoice - id is out of range for client; id is already in use
+ *     BadMatch    - window is not an InputOutput window;
+ *                   visual of window is not on list returned by
+ *                   DBEGetVisualInfo; 
+ *     BadValue    - invalid swap action is specified
+ *     BadWindow   - window is not a valid window
+ *     Success
+ *
+ *****************************************************************************/
+
+static int
+SProcDbeAllocateBackBufferName(client)
+    ClientPtr client;
+{
+    REQUEST(xDbeAllocateBackBufferNameReq);
+    register int	n;
+
+    swaps(&stuff->length, n);
+    REQUEST_SIZE_MATCH(xDbeAllocateBackBufferNameReq);
+
+    swapl(&stuff->window, n);
+    swapl(&stuff->buffer, n);
+    /* stuff->swapAction is a byte.  We do not need to swap this field. */
+
+    return(ProcDbeAllocateBackBufferName(client));
+
+} /* SProcDbeAllocateBackBufferName() */
+
+
+/******************************************************************************
+ *
+ * DBE DIX Procedure: SProcDbeDeallocateBackBufferName
+ *
+ * Description:
+ *
+ *     This function is for processing a DbeDeallocateBackBufferName request
+ *     on a swapped server.  This request frees a drawable ID that was
+ *     obtained by a DbeAllocateBackBufferName request.
+ *
+ * Return Values:
+ *
+ *     BadBuffer - buffer to deallocate is not associated with a window
+ *     Success
+ *
+ *****************************************************************************/
+
+static int
+SProcDbeDeallocateBackBufferName(client)
+    ClientPtr client;
+{
+    REQUEST (xDbeDeallocateBackBufferNameReq);
+    register int	n;
+
+
+    swaps(&stuff->length, n);
+    REQUEST_SIZE_MATCH(xDbeDeallocateBackBufferNameReq);
+
+    swapl(&stuff->buffer, n);
+
+    return(ProcDbeDeallocateBackBufferName(client));
+
+} /* SProcDbeDeallocateBackBufferName() */
+
+
+/******************************************************************************
+ *
+ * DBE DIX Procedure: SProcDbeSwapBuffers
+ *
+ * Description:
+ *
+ *     This function is for processing a DbeSwapBuffers request on a swapped
+ *     server.  This request swaps the buffers for all windows listed,
+ *     applying the appropriate swap action for each window.
+ *
+ * Return Values:
+ *
+ *     BadMatch  - a window in request is not double-buffered; a window in
+ *                 request is listed more than once; all windows in request do
+ *                 not have the same root
+ *     BadValue  - invalid swap action is specified
+ *     BadWindow - a window in request is not valid
+ *     Success
+ *
+ *****************************************************************************/
+
+static int
+SProcDbeSwapBuffers(client)
+    ClientPtr client;
+{
+    REQUEST(xDbeSwapBuffersReq);
+    register int	i, n;
+    xDbeSwapInfo	*pSwapInfo;
+
+
+    swaps(&stuff->length, n);
+    REQUEST_AT_LEAST_SIZE(xDbeSwapBuffersReq);
+
+    swapl(&stuff->n, n);
+
+    if (stuff->n != 0)
+    { 
+        pSwapInfo = (xDbeSwapInfo *)stuff+1;
+
+        /* The swap info following the fix part of this request is a window(32)
+         * followed by a 1 byte swap action and then 3 pad bytes.  We only need
+         * to swap the window information.
+         */
+        for (i = 0; i < stuff->n; i++)
+        {
+            swapl(&pSwapInfo->window, n);
+        }
+    }
+
+    return(ProcDbeSwapBuffers(client));
+
+} /* SProcDbeSwapBuffers() */
+
+
+/******************************************************************************
+ *
+ * DBE DIX Procedure: SProcDbeBeginIdiom
+ *
+ * Description:
+ *
+ *     This function is for processing a DbeBeginIdiom request on a swapped
+ *     server.  This request informs the server that a complex swap will
+ *     immediately follow this request.
+ *
+ * Return Values:
+ *
+ *     Success
+ *
+ *****************************************************************************/
+
+static int
+SProcDbeBeginIdiom(client)
+    ClientPtr client;
+{
+    REQUEST(xDbeBeginIdiomReq);
+    register int	n;
+
+    swaps(&stuff->length, n);
+    return(ProcDbeBeginIdiom(client));
+
+} /* SProcDbeBeginIdiom() */
+
+
+/******************************************************************************
+ *
+ * DBE DIX Procedure: SProcDbeGetVisualInfo
+ *
+ * Description:
+ *
+ *     This function is for processing a ProcDbeGetVisualInfo request on a
+ *     swapped server.  This request returns information about which visuals
+ *     support double buffering.
+ *
+ * Return Values:
+ *
+ *     BadDrawable - value in screen specifiers is not a valid drawable
+ *     Success
+ *
+ *****************************************************************************/
+
+static int
+SProcDbeGetVisualInfo(client)
+    ClientPtr client;
+{
+    REQUEST(xDbeGetVisualInfoReq);
+    register int	n;
+
+
+    swaps(&stuff->length, n);
+    REQUEST_AT_LEAST_SIZE(xDbeGetVisualInfoReq);
+
+    swapl(&stuff->n, n);
+    SwapRestL(stuff);
+
+    return(ProcDbeGetVisualInfo(client));
+
+} /* SProcDbeGetVisualInfo() */
+
+
+/******************************************************************************
+ *
+ * DBE DIX Procedure: SProcDbeGetbackBufferAttributes
+ *
+ * Description:
+ *
+ *     This function is for processing a ProcDbeGetbackBufferAttributes
+ *     request on a swapped server.  This request returns information about a
+ *     back buffer.
+ *
+ * Return Values:
+ *
+ *     Success
+ *
+ *****************************************************************************/
+
+static int
+SProcDbeGetBackBufferAttributes(client)
+    ClientPtr client;
+{
+    REQUEST (xDbeGetBackBufferAttributesReq);
+    register int	n;
+
+    swaps(&stuff->length, n);
+    REQUEST_SIZE_MATCH(xDbeGetBackBufferAttributesReq);
+
+    swapl(&stuff->buffer, n);
+
+    return(ProcDbeGetBackBufferAttributes(client));
+
+} /* SProcDbeGetBackBufferAttributes() */
+
+
+/******************************************************************************
+ *
+ * DBE DIX Procedure: SProcDbeDispatch
+ *
+ * Description:
+ *
+ *     This function dispatches DBE requests on a swapped server.
+ *
+ *****************************************************************************/
+
+static int
+SProcDbeDispatch(client)
+    ClientPtr client;
+{
+    REQUEST(xReq);
+
+
+    switch (stuff->data)
+    {
+        case X_DbeGetVersion:
+            return(SProcDbeGetVersion(client));
+
+        case X_DbeAllocateBackBufferName:
+            return(SProcDbeAllocateBackBufferName(client));
+
+        case X_DbeDeallocateBackBufferName:
+            return(SProcDbeDeallocateBackBufferName(client));
+
+        case X_DbeSwapBuffers:
+            return(SProcDbeSwapBuffers(client));
+
+        case X_DbeBeginIdiom:
+            return(SProcDbeBeginIdiom(client));
+
+        case X_DbeEndIdiom:
+            return(Success);
+
+        case X_DbeGetVisualInfo:
+            return(SProcDbeGetVisualInfo(client));
+
+        case X_DbeGetBackBufferAttributes:
+            return(SProcDbeGetBackBufferAttributes(client));
+
+        default:
+            return (BadRequest);
+    }
+
+} /* SProcDbeDispatch() */
+
+
+/******************************************************************************
+ *
+ * DBE DIX Procedure: DbeSetupBackgroundPainter
+ *
+ * Description:
+ *
+ *     This function sets up pGC to clear pixmaps.
+ *
+ * Return Values:
+ *
+ *     TRUE  - setup was successful
+ *     FALSE - the window's background state is NONE
+ * 
+ *****************************************************************************/
+
+static Bool
+DbeSetupBackgroundPainter(pWin, pGC)
+    WindowPtr	pWin;
+    GCPtr	pGC;
+{
+    pointer	gcvalues[4];
+    int		ts_x_origin, ts_y_origin;
+    PixUnion	background;
+    int		backgroundState;
+    Mask	gcmask;
+
+
+    /* First take care of any ParentRelative stuff by altering the
+     * tile/stipple origin to match the coordinates of the upper-left
+     * corner of the first ancestor without a ParentRelative background.
+     * This coordinate is, of course, negative.
+     */
+    ts_x_origin = ts_y_origin = 0;
+    while (pWin->backgroundState == ParentRelative)
+    {
+        ts_x_origin -= pWin->origin.x;
+        ts_y_origin -= pWin->origin.y;
+
+        pWin = pWin->parent;
+    }
+    backgroundState = pWin->backgroundState;
+    background      = pWin->background;
+
+    switch (backgroundState)
+    {
+        case BackgroundPixel:
+            gcvalues[0] = (pointer)background.pixel;
+            gcvalues[1] = (pointer)FillSolid;
+            gcmask = GCForeground|GCFillStyle;
+            break;
+
+        case BackgroundPixmap:
+            gcvalues[0] = (pointer)FillTiled;
+            gcvalues[1] = (pointer)background.pixmap;
+            gcvalues[2] = (pointer)ts_x_origin;
+            gcvalues[3] = (pointer)ts_y_origin;
+            gcmask = GCFillStyle|GCTile|GCTileStipXOrigin|GCTileStipYOrigin;
+            break;
+
+        default:
+            /* pWin->backgroundState == None */
+            return(FALSE);
+    }
+
+    if (DoChangeGC(pGC, gcmask, (XID *)gcvalues, TRUE) != 0)
+    {
+        return(FALSE);
+    }
+
+    return(TRUE);
+
+} /* DbeSetupBackgroundPainter() */
+
+
+/******************************************************************************
+ *
+ * DBE DIX Procedure: DbeDrawableDelete
+ *
+ * Description:
+ *
+ *     This is the resource delete function for dbeDrawableResType.
+ *     It is registered when the drawable resource type is created in
+ *     DbeExtensionInit().
+ *
+ *     To make resource deletion simple, we do not do anything in this function
+ *     and leave all resource deleteion to DbeWindowPrivDelete(), which will
+ *     eventually be called or already has been called.  Deletion functions are
+ *     not guaranteed to be called in any particular order.
+ *
+ *****************************************************************************/
+static int
+DbeDrawableDelete(pDrawable, id)
+    pointer	pDrawable;
+    XID		id;
+{
+    return(Success);
+
+} /* DbeDrawableDelete() */
+
+
+/******************************************************************************
+ *
+ * DBE DIX Procedure: DbeWindowPrivDelete
+ *
+ * Description:
+ *
+ *     This is the resource delete function for dbeWindowPrivResType.
+ *     It is registered when the drawable resource type is created in
+ *     DbeExtensionInit().
+ *
+ *****************************************************************************/
+static int
+DbeWindowPrivDelete(pDbeWinPriv, id)
+    pointer	pDbeWinPriv;
+    XID		id;
+{
+    DbeScreenPrivPtr	pDbeScreenPriv;
+    DbeWindowPrivPtr	pDbeWindowPriv = (DbeWindowPrivPtr)pDbeWinPriv;
+    int			i;
+
+
+    /*
+     **************************************************************************
+     ** Remove the buffer ID from the ID array.
+     **************************************************************************
+     */
+
+    /* Find the ID in the ID array. */
+    i = 0;
+    while ((i < pDbeWindowPriv->nBufferIDs) && (pDbeWindowPriv->IDs[i] != id))
+    {
+        i++;
+    }
+
+    if (i == pDbeWindowPriv->nBufferIDs)
+    {
+        /* We did not find the ID in the array.  We should never get here. */
+        return(BadValue);
+    }
+
+    /* Remove the ID from the array. */
+
+    if (i < (pDbeWindowPriv->nBufferIDs - 1))
+    {
+        /* Compress the buffer ID array, overwriting the ID in the process. */
+        memmove(&pDbeWindowPriv->IDs[i], &pDbeWindowPriv->IDs[i+1],
+            (pDbeWindowPriv->nBufferIDs - i - 1) * sizeof(XID));
+    }
+    else
+    {
+        /* We are removing the last ID in the array, in which case, the
+         * assignement below is all that we need to do.
+         */
+    }
+    pDbeWindowPriv->IDs[pDbeWindowPriv->nBufferIDs - 1] = DBE_FREE_ID_ELEMENT;
+
+    pDbeWindowPriv->nBufferIDs--;
+
+    /* If an extended array was allocated, then check to see if the remaining
+     * buffer IDs will fit in the static array.
+     */
+
+    if ((pDbeWindowPriv->maxAvailableIDs >  DBE_INIT_MAX_IDS) &&
+        (pDbeWindowPriv->nBufferIDs      == DBE_INIT_MAX_IDS))
+    {
+        /* Copy the IDs back into the static array. */
+        memcpy(pDbeWindowPriv->initIDs, pDbeWindowPriv->IDs,
+               DBE_INIT_MAX_IDS * sizeof(XID));
+
+        /* Free the extended array; use the static array. */
+        xfree(pDbeWindowPriv->IDs);
+        pDbeWindowPriv->IDs = pDbeWindowPriv->initIDs;
+        pDbeWindowPriv->maxAvailableIDs = DBE_INIT_MAX_IDS;
+    }
+
+
+    /*
+     **************************************************************************
+     ** Perform DDX level tasks.
+     **************************************************************************
+     */
+
+    pDbeScreenPriv = DBE_SCREEN_PRIV_FROM_WINDOW_PRIV(
+                         (DbeWindowPrivPtr)pDbeWindowPriv);
+    (*pDbeScreenPriv->WinPrivDelete)((DbeWindowPrivPtr)pDbeWindowPriv, id);
+
+
+    /*
+     **************************************************************************
+     ** Perform miscellaneous tasks if this is the last buffer associated
+     ** with the window.
+     **************************************************************************
+     */
+
+    if (pDbeWindowPriv->nBufferIDs == 0)
+    {
+        /* Reset the DBE window priv pointer. */
+        pDbeWindowPriv->pWindow->devPrivates[dbeWindowPrivIndex].ptr =
+            (pointer)NULL;
+
+        /* We are done with the window priv. */
+        xfree(pDbeWindowPriv);
+    }
+
+    return(Success);
+
+} /* DbeWindowPrivDelete() */
+
+
+/******************************************************************************
+ *
+ * DBE DIX Procedure: DbeResetProc
+ *
+ * Description:
+ *
+ *     This routine is called at the end of every server generation.
+ *     It deallocates any memory reserved for the extension and performs any
+ *     other tasks related to shutting down the extension.
+ *
+ *****************************************************************************/
+static void
+DbeResetProc(extEntry)
+    ExtensionEntry	*extEntry;
+{
+    int			i;
+    ScreenPtr		pScreen;
+    DbeScreenPrivPtr	pDbeScreenPriv;
+    
+
+    if (dbeScreenPrivIndex < 0)
+    {
+	return;
+    }
+
+    for (i = 0; i < screenInfo.numScreens; i++)
+    {
+	pScreen = screenInfo.screens[i];
+	pDbeScreenPriv = DBE_SCREEN_PRIV(pScreen);
+
+	if (pDbeScreenPriv)
+	{
+            /* Unwrap DestroyWindow, which was wrapped in DbeExtensionInit().*/
+            pScreen->DestroyWindow = pDbeScreenPriv->DestroyWindow;
+
+	    if (pDbeScreenPriv->ResetProc)
+		(*pDbeScreenPriv->ResetProc)(pScreen);
+
+            if (pDbeScreenPriv->winPrivPrivSizes)
+            {
+	        xfree(pDbeScreenPriv->winPrivPrivSizes);
+            }
+
+	    xfree(pDbeScreenPriv);
+	}
+    }
+
+    /* We want to init the initialization function table after every server
+     * reset in DbeRegisterFunction().
+     */
+    firstRegistrationPass = TRUE;
+
+} /* DbeResetProc() */
+
+
+/******************************************************************************
+ *
+ * DBE DIX Procedure: DbeDestroyWindow
+ *
+ * Description:
+ *
+ *     This is the wrapper for pScreen->DestroyWindow.
+ *     This function frees buffer resources for a window before it is
+ *     destroyed.
+ *
+ *****************************************************************************/
+
+static Bool
+DbeDestroyWindow(pWin)
+    WindowPtr	pWin;
+{
+    DbeScreenPrivPtr	pDbeScreenPriv;
+    DbeWindowPrivPtr	pDbeWindowPriv;
+    ScreenPtr		pScreen;
+    Bool		ret;
+
+
+    /*
+     **************************************************************************
+     ** 1. Unwrap the member routine.
+     **************************************************************************
+     */
+
+    pScreen                = pWin->drawable.pScreen;
+    pDbeScreenPriv         = DBE_SCREEN_PRIV(pScreen);
+    pScreen->DestroyWindow = pDbeScreenPriv->DestroyWindow;
+
+    /*
+     **************************************************************************
+     ** 2. Do any work necessary before the member routine is called.
+     **
+     **    Call the window priv delete function for all buffer IDs associated
+     **    with this window.
+     **************************************************************************
+     */
+
+    if (pDbeWindowPriv = DBE_WINDOW_PRIV(pWin))
+    {
+        while (pDbeWindowPriv)
+        {
+            /* *DbeWinPrivDelete() will free the window private and set it to
+             * NULL if there are no more buffer IDs associated with this
+             * window.
+             */
+            FreeResource(pDbeWindowPriv->IDs[0], RT_NONE);
+            pDbeWindowPriv = DBE_WINDOW_PRIV(pWin);
+        }
+    }
+
+    /*
+     **************************************************************************
+     ** 3. Call the member routine, saving its result if necessary.
+     **************************************************************************
+     */
+
+    ret = (*pScreen->DestroyWindow)(pWin);
+
+    /*
+     **************************************************************************
+     ** 4. Rewrap the member routine, restoring the wrapper value first in case
+     **    the wrapper (or something that it wrapped) change this value.
+     **************************************************************************
+     */
+
+    pDbeScreenPriv->DestroyWindow = pScreen->DestroyWindow;
+    pScreen->DestroyWindow = DbeDestroyWindow;
+
+    /*
+     **************************************************************************
+     ** 5. Do any work necessary after the member routine has been called.
+     **
+     **    In this case we do not need to do anything.
+     **************************************************************************
+     */
+
+    return(ret);
+
+} /* DbeDestroyWindow() */
+
+
+/******************************************************************************
+ *
+ * DBE DIX Procedure: DbeExtensionInit
+ *
+ * Description:
+ *
+ *     Called from InitExtensions in main()
+ *
+ *****************************************************************************/
+
+void
+DbeExtensionInit()
+{
+    ExtensionEntry	*extEntry;
+    register int	i, j;
+    ScreenPtr		pScreen;
+    DbeScreenPrivPtr	pDbeScreenPriv;
+    int			nStubbedScreens = 0;
+    Bool		ddxInitSuccess;
+
+
+    /* Allocate private pointers in windows and screens. */
+
+    if ((dbeScreenPrivIndex = AllocateScreenPrivateIndex()) < 0)
+    {
+	return;
+    }
+
+    if ((dbeWindowPrivIndex = AllocateWindowPrivateIndex()) < 0)
+    {
+	return;
+    }
+
+    /* Initialize the priv priv counts between server generations. */
+    winPrivPrivCount  = 0;
+
+    /* Create the resource types. */
+    dbeDrawableResType =
+        CreateNewResourceType(DbeDrawableDelete) | RC_CACHED | RC_DRAWABLE;
+    dbeWindowPrivResType =
+        CreateNewResourceType(DbeWindowPrivDelete);
+
+    for (i = 0; i < screenInfo.numScreens; i++)
+    {
+        /* For each screen, set up DBE screen privates and init DIX and DDX
+         * interface.
+         */
+
+	pScreen = screenInfo.screens[i];
+
+	if (!AllocateWindowPrivate(pScreen, dbeWindowPrivIndex, 0) ||
+	    !(pDbeScreenPriv =
+             (DbeScreenPrivPtr)Xcalloc(sizeof(DbeScreenPrivRec))))
+	{
+            /* If we can not alloc a window or screen private,
+             * then free any privates that we already alloc'ed and return
+             */
+
+	    for (j = 0; j < i; j++)
+	    {
+	      xfree(screenInfo.screens[j]->devPrivates[dbeScreenPrivIndex].ptr);
+              screenInfo.screens[j]->devPrivates[dbeScreenPrivIndex].ptr = NULL;
+	    }
+	    return;
+	}
+
+	pScreen->devPrivates[dbeScreenPrivIndex].ptr = (pointer)pDbeScreenPriv;
+
+        /* Store the DBE priv priv size info for later use when allocating
+         * priv privs at the driver level.
+         */
+        pDbeScreenPriv->winPrivPrivLen   = 0;
+        pDbeScreenPriv->winPrivPrivSizes = (unsigned *)NULL;
+        pDbeScreenPriv->totalWinPrivSize = sizeof(DbeWindowPrivRec);
+
+        /* Copy the resource types */
+        pDbeScreenPriv->dbeDrawableResType   = dbeDrawableResType;
+        pDbeScreenPriv->dbeWindowPrivResType = dbeWindowPrivResType;
+
+        /* Copy the private indices */
+        pDbeScreenPriv->dbeScreenPrivIndex = dbeScreenPrivIndex;
+        pDbeScreenPriv->dbeWindowPrivIndex = dbeWindowPrivIndex;
+
+        if(DbeInitFunct[i])
+        {
+            /* This screen supports DBE. */
+
+            /* Setup DIX. */
+            pDbeScreenPriv->SetupBackgroundPainter = DbeSetupBackgroundPainter; 
+            pDbeScreenPriv->AllocWinPriv           = DbeAllocWinPriv;
+            pDbeScreenPriv->AllocWinPrivPrivIndex  = DbeAllocWinPrivPrivIndex;
+            pDbeScreenPriv->AllocWinPrivPriv       = DbeAllocWinPrivPriv;
+
+            /* Setup DDX. */
+            ddxInitSuccess = (*DbeInitFunct[i])(pScreen, pDbeScreenPriv);
+
+            /* DDX DBE initialization may have the side affect of
+             * reallocating pDbeScreenPriv, so we need to update it.
+             */
+            pDbeScreenPriv = DBE_SCREEN_PRIV(pScreen);
+
+            if (ddxInitSuccess)
+            {
+                /* Wrap DestroyWindow.  The DDX initialization function
+                 * already wrapped PositionWindow for us.
+                 */
+
+                pDbeScreenPriv->DestroyWindow = pScreen->DestroyWindow;
+                pScreen->DestroyWindow        = DbeDestroyWindow;
+            }
+            else
+            {
+                /* DDX initialization failed.  Stub the screen. */
+                DbeStubScreen(pDbeScreenPriv, &nStubbedScreens);
+            }
+        }
+        else
+        {
+            /* This screen does not support DBE. */
+
+#ifndef DISABLE_MI_DBE_BY_DEFAULT
+            /* Setup DIX. */
+            pDbeScreenPriv->SetupBackgroundPainter = DbeSetupBackgroundPainter; 
+            pDbeScreenPriv->AllocWinPriv           = DbeAllocWinPriv;
+            pDbeScreenPriv->AllocWinPrivPrivIndex  = DbeAllocWinPrivPrivIndex;
+            pDbeScreenPriv->AllocWinPrivPriv       = DbeAllocWinPrivPriv;
+
+            /* Setup DDX. */
+            ddxInitSuccess = miDbeInit(pScreen, pDbeScreenPriv);
+
+            /* DDX DBE initialization may have the side affect of
+             * reallocating pDbeScreenPriv, so we need to update it.
+             */
+            pDbeScreenPriv = DBE_SCREEN_PRIV(pScreen);
+
+            if (ddxInitSuccess)
+            {
+                /* Wrap DestroyWindow.  The DDX initialization function
+                 * already wrapped PositionWindow for us.
+                 */
+
+                pDbeScreenPriv->DestroyWindow = pScreen->DestroyWindow;
+                pScreen->DestroyWindow        = DbeDestroyWindow;
+            }
+            else
+            {
+                /* DDX initialization failed.  Stub the screen. */
+                DbeStubScreen(pDbeScreenPriv, &nStubbedScreens);
+            }
+#else
+            DbeStubScreen(pDbeScreenPriv, &nStubbedScreens);
+#endif
+
+        } /* else -- this screen does not support DBE. */
+
+    } /* for (i = 0; i < screenInfo.numScreens; i++) */
+
+
+    if (nStubbedScreens == screenInfo.numScreens)
+    {
+	/* All screens stubbed.  Clean up and return. */
+
+        for (i = 0; i < screenInfo.numScreens; i++)
+        {
+             xfree(screenInfo.screens[i]->devPrivates[dbeScreenPrivIndex].ptr);
+             pScreen->devPrivates[dbeScreenPrivIndex].ptr = NULL;
+        }
+        return;
+    }
+
+
+    /* Now add the extension. */
+    extEntry = AddExtension(DBE_PROTOCOL_NAME, DbeNumberEvents, 
+                            DbeNumberErrors, ProcDbeDispatch, SProcDbeDispatch,
+                            DbeResetProc, StandardMinorOpcode);
+
+    dbeErrorBase = extEntry->errorBase;
+
+} /* DbeExtensionInit() */
+
+