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+/* $XdotOrg: xc/programs/Xserver/dbe/dbe.c,v 1.5 2005/07/03 07:01:17 daniels Exp $ */
+/* $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
+ *
+ *****************************************************************************/
+/* $XFree86: xc/programs/Xserver/dbe/dbe.c,v 3.10 2001/08/23 14:19:24 alanh Exp $ */
+
+
+/* INCLUDES */
+
+#define NEED_EVENTS
+#ifdef HAVE_DIX_CONFIG_H
+#include <dix-config.h>
+#endif
+
+#include <X11/X.h>
+#include <X11/Xproto.h>
+#include "scrnintstr.h"
+#include "extnsionst.h"
+#include "gcstruct.h"
+#include "dixstruct.h"
+#define NEED_DBE_PROTOCOL
+#include "dbestruct.h"
+#include "midbe.h"
+
+#ifdef XFree86LOADER
+#include "xf86_ansic.h"
+#endif
+
+#if !defined(UINT32_MAX)
+#define UINT32_MAX 0xffffffffU
+#endif
+
+/* 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().
+ *
+ *****************************************************************************/
+
+#if 0 /* NOT USED */
+static DbeWindowPrivPtr
+DbeFallbackAllocWinPriv(pScreen)
+ ScreenPtr pScreen;
+{
+ return (NULL);
+} /* DbeFallbackAllocWinPriv() */
+#endif
+
+
+/******************************************************************************
+ *
+ * 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);
+ }
+
+ if (nStuff > UINT32_MAX / sizeof(DbeSwapInfoRec))
+ return BadAlloc;
+
+ /* Get to the swap info appended to the end of the request. */
+ dbeSwapInfo = (xDbeSwapInfo *)&stuff[1];
+
+ /* Allocate array to record swap information. */
+ swapInfo = (DbeSwapInfoPtr)Xalloc(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)))
+ {
+ Xfree(swapInfo);
+ return(BadWindow);
+ }
+
+ /* Each window must be double-buffered - BadMatch. */
+ if (DBE_WINDOW_PRIV(pWin) == NULL)
+ {
+ Xfree(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)
+ {
+ Xfree(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 ))
+ {
+ Xfree(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)
+ {
+ Xfree(swapInfo);
+ return(error);
+ }
+ }
+
+ Xfree(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);
+
+ if (stuff->n > UINT32_MAX / sizeof(DrawablePtr))
+ return BadAlloc;
+ /* Make sure any specified drawables are valid. */
+ if (stuff->n != 0)
+ {
+ if (!(pDrawables = (DrawablePtr *)Xalloc(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)))
+ {
+ Xfree(pDrawables);
+ return(BadDrawable);
+ }
+ }
+ }
+
+ count = (stuff->n == 0) ? screenInfo.numScreens : stuff->n;
+ if (!(pScrVisInfo = (XdbeScreenVisualInfo *)xalloc(count *
+ sizeof(XdbeScreenVisualInfo))))
+ {
+ if (pDrawables)
+ {
+ Xfree(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)
+ {
+ Xfree(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 >> 2;
+ 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)
+ {
+ Xfree(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)(long)ts_x_origin;
+ gcvalues[3] = (pointer)(long)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 = NULL;
+ DbeScreenPrivPtr pDbeScreenPriv;
+ int nStubbedScreens = 0;
+ Bool ddxInitSuccess;
+
+#ifdef PANORAMIX
+ if(!noPanoramiXExtension) return;
+#endif
+
+ /* 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() */
+