R6.6 is the Xorg base-lineXORG-MAIN

1 files changed, 441 insertions, 0 deletions

diff --git a/dix/grabs.c b/dix/grabs.c
new file mode 100644
index 000000000..80422f53f
--- /dev/null
+++ b/dix/grabs.c
@@ -0,0 +1,441 @@
+/* $Xorg: grabs.c,v 1.4 2001/02/09 02:04:40 xorgcvs Exp $ */
+/*
+
+Copyright 1987, 1998  The Open Group
+
+Permission to use, copy, modify, distribute, and sell this software and its
+documentation for any purpose is hereby granted without fee, provided that
+the above copyright notice appear in all copies and that both that
+copyright notice and this permission notice appear in supporting
+documentation.
+
+The above copyright notice and this permission notice shall be included
+in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+Except as contained in this notice, the name of The Open Group shall
+not be used in advertising or otherwise to promote the sale, use or
+other dealings in this Software without prior written authorization
+from The Open Group.
+
+
+Copyright 1987 by Digital Equipment Corporation, Maynard, Massachusetts,
+
+                        All Rights Reserved
+
+Permission to use, copy, modify, and distribute this software and its 
+documentation for any purpose and without fee is hereby granted, 
+provided that the above copyright notice appear in all copies and that
+both that copyright notice and this permission notice appear in 
+supporting documentation, and that the name of Digital not be
+used in advertising or publicity pertaining to distribution of the
+software without specific, written prior permission.  
+DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
+ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
+DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
+ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
+WHETHER IN AN action OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
+ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
+SOFTWARE.
+
+*/
+
+#include "X.h"
+#include "misc.h"
+#define NEED_EVENTS
+#include "Xproto.h"
+#include "windowstr.h"
+#include "inputstr.h"
+#include "cursorstr.h"
+
+extern InputInfo inputInfo;
+
+#define BITMASK(i) (((Mask)1) << ((i) & 31))
+#define MASKIDX(i) ((i) >> 5)
+#define MASKWORD(buf, i) buf[MASKIDX(i)]
+#define BITSET(buf, i) MASKWORD(buf, i) |= BITMASK(i)
+#define BITCLEAR(buf, i) MASKWORD(buf, i) &= ~BITMASK(i)
+#define GETBIT(buf, i) (MASKWORD(buf, i) & BITMASK(i))
+
+GrabPtr
+CreateGrab(client, device, window, eventMask, ownerEvents, keyboardMode,
+	   pointerMode, modDevice, modifiers, type, keybut, confineTo, cursor)
+    int client;
+    DeviceIntPtr device;
+    WindowPtr window;
+    Mask eventMask;
+    Bool ownerEvents, keyboardMode, pointerMode;
+    DeviceIntPtr modDevice;
+    unsigned short modifiers;
+    int type;
+    KeyCode keybut;	/* key or button */
+    WindowPtr confineTo;
+    CursorPtr cursor;
+{
+    GrabPtr grab;
+
+    grab = (GrabPtr)xalloc(sizeof(GrabRec));
+    if (!grab)
+	return (GrabPtr)NULL;
+    grab->resource = FakeClientID(client);
+    grab->device = device;
+    grab->coreGrab = ((device == inputInfo.keyboard) ||
+		      (device == inputInfo.pointer));
+    grab->window = window;
+    grab->eventMask = eventMask;
+    grab->ownerEvents = ownerEvents;
+    grab->keyboardMode = keyboardMode;
+    grab->pointerMode = pointerMode;
+    grab->modifiersDetail.exact = modifiers;
+    grab->modifiersDetail.pMask = NULL;
+    grab->modifierDevice = modDevice;
+    grab->coreMods = ((modDevice == inputInfo.keyboard) ||
+		      (modDevice == inputInfo.pointer));
+    grab->type = type;
+    grab->detail.exact = keybut;
+    grab->detail.pMask = NULL;
+    grab->confineTo = confineTo;
+    grab->cursor = cursor;
+    if (cursor)
+	cursor->refcnt++;
+    return grab;
+
+}
+
+static void
+FreeGrab(pGrab)
+    GrabPtr pGrab;
+{
+    if (pGrab->modifiersDetail.pMask != NULL)
+	xfree(pGrab->modifiersDetail.pMask);
+
+    if (pGrab->detail.pMask != NULL)
+	xfree(pGrab->detail.pMask);
+
+    if (pGrab->cursor)
+	FreeCursor(pGrab->cursor, (Cursor)0);
+
+    xfree(pGrab);
+}
+
+/*ARGSUSED*/
+int
+DeletePassiveGrab(value, id)
+    pointer value;
+    XID   id;
+{
+    register GrabPtr g, prev;
+    GrabPtr pGrab = (GrabPtr)value;
+
+    /* it is OK if the grab isn't found */
+    prev = 0;
+    for (g = (wPassiveGrabs (pGrab->window)); g; g = g->next)
+    {
+	if (pGrab == g)
+	{
+	    if (prev)
+		prev->next = g->next;
+	    else
+		if (!(pGrab->window->optional->passiveGrabs = g->next))
+		    CheckWindowOptionalNeed (pGrab->window);
+	    break;
+	}
+	prev = g;
+    }
+    FreeGrab(pGrab);
+    return Success;
+}
+
+static Mask *
+DeleteDetailFromMask(pDetailMask, detail)
+    Mask *pDetailMask;
+    unsigned short detail;
+{
+    register Mask *mask;
+    register int i;
+
+    mask = (Mask *)xalloc(sizeof(Mask) * MasksPerDetailMask);
+    if (mask)
+    {
+	if (pDetailMask)
+	    for (i = 0; i < MasksPerDetailMask; i++)
+		mask[i]= pDetailMask[i];
+	else
+	    for (i = 0; i < MasksPerDetailMask; i++)
+		mask[i]= ~0L;
+	BITCLEAR(mask, detail);
+    }
+    return mask; 
+}
+
+static Bool
+IsInGrabMask(firstDetail, secondDetail, exception)
+    DetailRec firstDetail, secondDetail;
+    unsigned short exception;
+{
+    if (firstDetail.exact == exception)
+    {
+	if (firstDetail.pMask == NULL)
+	    return TRUE;
+	
+	/* (at present) never called with two non-null pMasks */
+	if (secondDetail.exact == exception)
+	    return FALSE;
+
+ 	if (GETBIT(firstDetail.pMask, secondDetail.exact))
+	    return TRUE;
+    }
+    
+    return FALSE;
+}
+
+static Bool 
+IdenticalExactDetails(firstExact, secondExact, exception)
+    unsigned short firstExact, secondExact, exception;
+{
+    if ((firstExact == exception) || (secondExact == exception))
+	return FALSE;
+   
+    if (firstExact == secondExact)
+	return TRUE;
+
+    return FALSE;
+}
+
+static Bool 
+DetailSupersedesSecond(firstDetail, secondDetail, exception)
+    DetailRec firstDetail, secondDetail;
+    unsigned short exception;
+{
+    if (IsInGrabMask(firstDetail, secondDetail, exception))
+	return TRUE;
+
+    if (IdenticalExactDetails(firstDetail.exact, secondDetail.exact,
+			      exception))
+	return TRUE;
+  
+    return FALSE;
+}
+
+static Bool
+GrabSupersedesSecond(pFirstGrab, pSecondGrab)
+    GrabPtr pFirstGrab, pSecondGrab;
+{
+    if (!DetailSupersedesSecond(pFirstGrab->modifiersDetail,
+				pSecondGrab->modifiersDetail, 
+				(unsigned short)AnyModifier))
+	return FALSE;
+
+    if (DetailSupersedesSecond(pFirstGrab->detail,
+			       pSecondGrab->detail, (unsigned short)AnyKey))
+	return TRUE;
+ 
+    return FALSE;
+}
+
+Bool
+GrabMatchesSecond(pFirstGrab, pSecondGrab)
+    GrabPtr pFirstGrab, pSecondGrab;
+{
+    if ((pFirstGrab->device != pSecondGrab->device) ||
+	(pFirstGrab->modifierDevice != pSecondGrab->modifierDevice) ||
+	(pFirstGrab->type != pSecondGrab->type))
+	return FALSE;
+
+    if (GrabSupersedesSecond(pFirstGrab, pSecondGrab) ||
+	GrabSupersedesSecond(pSecondGrab, pFirstGrab))
+	return TRUE;
+ 
+    if (DetailSupersedesSecond(pSecondGrab->detail, pFirstGrab->detail,
+			       (unsigned short)AnyKey) 
+	&& 
+	DetailSupersedesSecond(pFirstGrab->modifiersDetail,
+			       pSecondGrab->modifiersDetail,
+			       (unsigned short)AnyModifier))
+	return TRUE;
+
+    if (DetailSupersedesSecond(pFirstGrab->detail, pSecondGrab->detail,
+			       (unsigned short)AnyKey)
+	&& 
+	DetailSupersedesSecond(pSecondGrab->modifiersDetail,
+			       pFirstGrab->modifiersDetail,
+			       (unsigned short)AnyModifier))
+	return TRUE;
+
+    return FALSE;
+}
+
+int
+AddPassiveGrabToList(pGrab)
+    GrabPtr pGrab;
+{
+    GrabPtr grab;
+
+    for (grab = wPassiveGrabs(pGrab->window); grab; grab = grab->next)
+    {
+	if (GrabMatchesSecond(pGrab, grab))
+	{
+	    if (CLIENT_BITS(pGrab->resource) != CLIENT_BITS(grab->resource))
+	    {
+		FreeGrab(pGrab);
+		return BadAccess;
+	    }
+	}
+    }
+
+    if (!pGrab->window->optional && !MakeWindowOptional (pGrab->window))
+    {
+	FreeGrab(pGrab);
+	return BadAlloc;
+    }
+    pGrab->next = pGrab->window->optional->passiveGrabs;
+    pGrab->window->optional->passiveGrabs = pGrab;
+    if (AddResource(pGrab->resource, RT_PASSIVEGRAB, (pointer)pGrab))
+	return Success;
+    return BadAlloc;
+}
+
+/* the following is kinda complicated, because we need to be able to back out
+ * if any allocation fails
+ */
+
+Bool
+DeletePassiveGrabFromList(pMinuendGrab)
+    GrabPtr pMinuendGrab;
+{
+    register GrabPtr grab;
+    GrabPtr *deletes, *adds;
+    Mask ***updates, **details;
+    int i, ndels, nadds, nups;
+    Bool ok;
+
+#define UPDATE(mask,exact) \
+	if (!(details[nups] = DeleteDetailFromMask(mask, exact))) \
+	  ok = FALSE; \
+	else \
+	  updates[nups++] = &(mask)
+
+    i = 0;
+    for (grab = wPassiveGrabs(pMinuendGrab->window); grab; grab = grab->next)
+	i++;
+    if (!i)
+	return TRUE;
+    deletes = (GrabPtr *)ALLOCATE_LOCAL(i * sizeof(GrabPtr));
+    adds = (GrabPtr *)ALLOCATE_LOCAL(i * sizeof(GrabPtr));
+    updates = (Mask ***)ALLOCATE_LOCAL(i * sizeof(Mask **));
+    details = (Mask **)ALLOCATE_LOCAL(i * sizeof(Mask *));
+    if (!deletes || !adds || !updates || !details)
+    {
+	if (details) DEALLOCATE_LOCAL(details);
+	if (updates) DEALLOCATE_LOCAL(updates);
+	if (adds) DEALLOCATE_LOCAL(adds);
+	if (deletes) DEALLOCATE_LOCAL(deletes);
+	return FALSE;
+    }
+    ndels = nadds = nups = 0;
+    ok = TRUE;
+    for (grab = wPassiveGrabs(pMinuendGrab->window);
+	 grab && ok;
+	 grab = grab->next)
+    {
+	if ((CLIENT_BITS(grab->resource) != CLIENT_BITS(pMinuendGrab->resource)) ||
+	    !GrabMatchesSecond(grab, pMinuendGrab))
+	    continue;
+	if (GrabSupersedesSecond(pMinuendGrab, grab))
+	{
+	    deletes[ndels++] = grab;
+	}
+	else if ((grab->detail.exact == AnyKey)
+		 && (grab->modifiersDetail.exact != AnyModifier))
+	{
+	    UPDATE(grab->detail.pMask, pMinuendGrab->detail.exact);
+	}
+	else if ((grab->modifiersDetail.exact == AnyModifier) 
+		 && (grab->detail.exact != AnyKey))
+	{
+	    UPDATE(grab->modifiersDetail.pMask,
+		   pMinuendGrab->modifiersDetail.exact);
+	}
+	else if ((pMinuendGrab->detail.exact != AnyKey)
+		 && (pMinuendGrab->modifiersDetail.exact != AnyModifier))
+	{
+	    GrabPtr pNewGrab;
+
+	    UPDATE(grab->detail.pMask, pMinuendGrab->detail.exact);
+
+	    pNewGrab = CreateGrab(CLIENT_ID(grab->resource), grab->device,
+				  grab->window, (Mask)grab->eventMask,
+				  (Bool)grab->ownerEvents,
+				  (Bool)grab->keyboardMode,
+				  (Bool)grab->pointerMode,
+				  grab->modifierDevice,
+				  AnyModifier, (int)grab->type,
+				  pMinuendGrab->detail.exact,
+				  grab->confineTo, grab->cursor);
+	    if (!pNewGrab)
+		ok = FALSE;
+	    else if (!(pNewGrab->modifiersDetail.pMask =
+		       DeleteDetailFromMask(grab->modifiersDetail.pMask,
+					 pMinuendGrab->modifiersDetail.exact))
+		     ||
+		     (!pNewGrab->window->optional &&
+		      !MakeWindowOptional(pNewGrab->window)))
+	    {
+		FreeGrab(pNewGrab);
+		ok = FALSE;
+	    }
+	    else if (!AddResource(pNewGrab->resource, RT_PASSIVEGRAB,
+				  (pointer)pNewGrab))
+		ok = FALSE;
+	    else
+		adds[nadds++] = pNewGrab;
+	}   
+	else if (pMinuendGrab->detail.exact == AnyKey)
+	{
+	    UPDATE(grab->modifiersDetail.pMask,
+		   pMinuendGrab->modifiersDetail.exact);
+	}
+	else
+	{
+	    UPDATE(grab->detail.pMask, pMinuendGrab->detail.exact);
+	}
+    }
+
+    if (!ok)
+    {
+	for (i = 0; i < nadds; i++)
+	    FreeResource(adds[i]->resource, RT_NONE);
+	for (i = 0; i < nups; i++)
+	    xfree(details[i]);
+    }
+    else
+    {
+	for (i = 0; i < ndels; i++)
+	    FreeResource(deletes[i]->resource, RT_NONE);
+	for (i = 0; i < nadds; i++)
+	{
+	    grab = adds[i];
+	    grab->next = grab->window->optional->passiveGrabs;
+	    grab->window->optional->passiveGrabs = grab;
+	}
+	for (i = 0; i < nups; i++)
+	{
+	    xfree(*updates[i]);
+	    *updates[i] = details[i];
+	}
+    }
+    DEALLOCATE_LOCAL(details);
+    DEALLOCATE_LOCAL(updates);
+    DEALLOCATE_LOCAL(adds);
+    DEALLOCATE_LOCAL(deletes);
+    return ok;
+
+#undef UPDATE
+}