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xenocara/xserver/xfixes/cursor.c
matthieu 61a7d5427d Update to xserver 1.11.2
2011-11-05 13:32:40 +00:00

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/*
* Copyright (c) 2006, Oracle and/or its affiliates. All rights reserved.
* Copyright 2010 Red Hat, Inc.
*
* 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 (including the next
* paragraph) 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 AUTHORS OR COPYRIGHT HOLDERS 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.
*
* Copyright © 2002 Keith Packard
*
* 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, and that the name of Keith Packard not be used in
* advertising or publicity pertaining to distribution of the software without
* specific, written prior permission. Keith Packard makes no
* representations about the suitability of this software for any purpose. It
* is provided "as is" without express or implied warranty.
*
* KEITH PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
* EVENT SHALL KEITH PACKARD 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.
*/
#ifdef HAVE_DIX_CONFIG_H
#include <dix-config.h>
#endif
#include "xfixesint.h"
#include "scrnintstr.h"
#include "cursorstr.h"
#include "dixevents.h"
#include "servermd.h"
#include "mipointer.h"
#include "inputstr.h"
#include "windowstr.h"
#include "xace.h"
#include "list.h"
static RESTYPE CursorClientType;
static RESTYPE CursorHideCountType;
static RESTYPE CursorWindowType;
RESTYPE PointerBarrierType;
static CursorPtr CursorCurrent[MAXDEVICES];
static DevPrivateKeyRec CursorScreenPrivateKeyRec;
#define CursorScreenPrivateKey (&CursorScreenPrivateKeyRec)
static void deleteCursorHideCountsForScreen (ScreenPtr pScreen);
#define VERIFY_CURSOR(pCursor, cursor, client, access) \
do { \
int err; \
err = dixLookupResourceByType((pointer *) &pCursor, cursor, \
RT_CURSOR, client, access); \
if (err != Success) { \
client->errorValue = cursor; \
return err; \
} \
} while (0)
/*
* There is a global list of windows selecting for cursor events
*/
typedef struct _CursorEvent *CursorEventPtr;
typedef struct _CursorEvent {
CursorEventPtr next;
CARD32 eventMask;
ClientPtr pClient;
WindowPtr pWindow;
XID clientResource;
} CursorEventRec;
static CursorEventPtr cursorEvents;
/*
* Each screen has a list of clients which have requested
* that the cursor be hid, and the number of times each
* client has requested.
*/
typedef struct _CursorHideCountRec *CursorHideCountPtr;
typedef struct _CursorHideCountRec {
CursorHideCountPtr pNext;
ClientPtr pClient;
ScreenPtr pScreen;
int hideCount;
XID resource;
} CursorHideCountRec;
typedef struct PointerBarrierClient *PointerBarrierClientPtr;
struct PointerBarrierClient {
ScreenPtr screen;
struct PointerBarrier barrier;
struct list entry;
};
/*
* Wrap DisplayCursor to catch cursor change events
*/
typedef struct _CursorScreen {
DisplayCursorProcPtr DisplayCursor;
CloseScreenProcPtr CloseScreen;
ConstrainCursorHarderProcPtr ConstrainCursorHarder;
CursorHideCountPtr pCursorHideCounts;
struct list barriers;
} CursorScreenRec, *CursorScreenPtr;
#define GetCursorScreen(s) ((CursorScreenPtr)dixLookupPrivate(&(s)->devPrivates, CursorScreenPrivateKey))
#define GetCursorScreenIfSet(s) GetCursorScreen(s)
#define SetCursorScreen(s,p) dixSetPrivate(&(s)->devPrivates, CursorScreenPrivateKey, p)
#define Wrap(as,s,elt,func) (((as)->elt = (s)->elt), (s)->elt = func)
#define Unwrap(as,s,elt,backup) (((backup) = (s)->elt), (s)->elt = (as)->elt)
/* The cursor doesn't show up until the first XDefineCursor() */
static Bool CursorVisible = FALSE;
Bool EnableCursor = TRUE;
static Bool
CursorDisplayCursor (DeviceIntPtr pDev,
ScreenPtr pScreen,
CursorPtr pCursor)
{
CursorScreenPtr cs = GetCursorScreen(pScreen);
Bool ret;
DisplayCursorProcPtr backupProc;
Unwrap (cs, pScreen, DisplayCursor, backupProc);
/*
* Have to check ConnectionInfo to distinguish client requests from
* initial root window setup. Not a great way to do it, I admit.
*/
if (ConnectionInfo)
CursorVisible = EnableCursor;
if (cs->pCursorHideCounts != NULL || !CursorVisible) {
ret = (*pScreen->DisplayCursor) (pDev, pScreen, NullCursor);
} else {
ret = (*pScreen->DisplayCursor) (pDev, pScreen, pCursor);
}
if (pCursor != CursorCurrent[pDev->id])
{
CursorEventPtr e;
CursorCurrent[pDev->id] = pCursor;
for (e = cursorEvents; e; e = e->next)
{
if ((e->eventMask & XFixesDisplayCursorNotifyMask))
{
xXFixesCursorNotifyEvent ev;
ev.type = XFixesEventBase + XFixesCursorNotify;
ev.subtype = XFixesDisplayCursorNotify;
ev.window = e->pWindow->drawable.id;
ev.cursorSerial = pCursor->serialNumber;
ev.timestamp = currentTime.milliseconds;
ev.name = pCursor->name;
WriteEventsToClient (e->pClient, 1, (xEvent *) &ev);
}
}
}
Wrap (cs, pScreen, DisplayCursor, backupProc);
return ret;
}
static Bool
CursorCloseScreen (int index, ScreenPtr pScreen)
{
CursorScreenPtr cs = GetCursorScreen (pScreen);
Bool ret;
_X_UNUSED CloseScreenProcPtr close_proc;
_X_UNUSED DisplayCursorProcPtr display_proc;
ConstrainCursorHarderProcPtr constrain_proc;
Unwrap (cs, pScreen, CloseScreen, close_proc);
Unwrap (cs, pScreen, DisplayCursor, display_proc);
Unwrap (cs, pScreen, ConstrainCursorHarder, constrain_proc);
deleteCursorHideCountsForScreen(pScreen);
ret = (*pScreen->CloseScreen) (index, pScreen);
free(cs);
return ret;
}
#define CursorAllEvents (XFixesDisplayCursorNotifyMask)
static int
XFixesSelectCursorInput (ClientPtr pClient,
WindowPtr pWindow,
CARD32 eventMask)
{
CursorEventPtr *prev, e;
pointer val;
int rc;
for (prev = &cursorEvents; (e = *prev); prev = &e->next)
{
if (e->pClient == pClient &&
e->pWindow == pWindow)
{
break;
}
}
if (!eventMask)
{
if (e)
{
FreeResource (e->clientResource, 0);
}
return Success;
}
if (!e)
{
e = (CursorEventPtr) malloc(sizeof (CursorEventRec));
if (!e)
return BadAlloc;
e->next = 0;
e->pClient = pClient;
e->pWindow = pWindow;
e->clientResource = FakeClientID(pClient->index);
/*
* Add a resource hanging from the window to
* catch window destroy
*/
rc = dixLookupResourceByType( &val, pWindow->drawable.id,
CursorWindowType, serverClient,
DixGetAttrAccess);
if (rc != Success)
if (!AddResource (pWindow->drawable.id, CursorWindowType,
(pointer) pWindow))
{
free(e);
return BadAlloc;
}
if (!AddResource (e->clientResource, CursorClientType, (pointer) e))
return BadAlloc;
*prev = e;
}
e->eventMask = eventMask;
return Success;
}
int
ProcXFixesSelectCursorInput (ClientPtr client)
{
REQUEST (xXFixesSelectCursorInputReq);
WindowPtr pWin;
int rc;
REQUEST_SIZE_MATCH (xXFixesSelectCursorInputReq);
rc = dixLookupWindow(&pWin, stuff->window, client, DixGetAttrAccess);
if (rc != Success)
return rc;
if (stuff->eventMask & ~CursorAllEvents)
{
client->errorValue = stuff->eventMask;
return BadValue;
}
return XFixesSelectCursorInput (client, pWin, stuff->eventMask);
}
static int
GetBit (unsigned char *line, int x)
{
unsigned char mask;
if (screenInfo.bitmapBitOrder == LSBFirst)
mask = (1 << (x & 7));
else
mask = (0x80 >> (x & 7));
/* XXX assumes byte order is host byte order */
line += (x >> 3);
if (*line & mask)
return 1;
return 0;
}
int
SProcXFixesSelectCursorInput (ClientPtr client)
{
register int n;
REQUEST(xXFixesSelectCursorInputReq);
swaps(&stuff->length, n);
swapl(&stuff->window, n);
swapl(&stuff->eventMask, n);
return (*ProcXFixesVector[stuff->xfixesReqType]) (client);
}
void
SXFixesCursorNotifyEvent (xXFixesCursorNotifyEvent *from,
xXFixesCursorNotifyEvent *to)
{
to->type = from->type;
cpswaps (from->sequenceNumber, to->sequenceNumber);
cpswapl (from->window, to->window);
cpswapl (from->cursorSerial, to->cursorSerial);
cpswapl (from->timestamp, to->timestamp);
cpswapl (from->name, to->name);
}
static void
CopyCursorToImage (CursorPtr pCursor, CARD32 *image)
{
int width = pCursor->bits->width;
int height = pCursor->bits->height;
int npixels = width * height;
#ifdef ARGB_CURSOR
if (pCursor->bits->argb)
memcpy (image, pCursor->bits->argb, npixels * sizeof (CARD32));
else
#endif
{
unsigned char *srcLine = pCursor->bits->source;
unsigned char *mskLine = pCursor->bits->mask;
int stride = BitmapBytePad (width);
int x, y;
CARD32 fg, bg;
fg = (0xff000000 |
((pCursor->foreRed & 0xff00) << 8) |
(pCursor->foreGreen & 0xff00) |
(pCursor->foreBlue >> 8));
bg = (0xff000000 |
((pCursor->backRed & 0xff00) << 8) |
(pCursor->backGreen & 0xff00) |
(pCursor->backBlue >> 8));
for (y = 0; y < height; y++)
{
for (x = 0; x < width; x++)
{
if (GetBit (mskLine, x))
{
if (GetBit (srcLine, x))
*image++ = fg;
else
*image++ = bg;
}
else
*image++ = 0;
}
srcLine += stride;
mskLine += stride;
}
}
}
int
ProcXFixesGetCursorImage (ClientPtr client)
{
/* REQUEST(xXFixesGetCursorImageReq); */
xXFixesGetCursorImageReply *rep;
CursorPtr pCursor;
CARD32 *image;
int npixels, width, height, rc, x, y;
REQUEST_SIZE_MATCH(xXFixesGetCursorImageReq);
pCursor = CursorCurrent[PickPointer(client)->id];
if (!pCursor)
return BadCursor;
rc = XaceHook(XACE_RESOURCE_ACCESS, client, pCursor->id, RT_CURSOR,
pCursor, RT_NONE, NULL, DixReadAccess);
if (rc != Success)
return rc;
GetSpritePosition (PickPointer(client), &x, &y);
width = pCursor->bits->width;
height = pCursor->bits->height;
npixels = width * height;
rep = malloc(sizeof (xXFixesGetCursorImageReply) +
npixels * sizeof (CARD32));
if (!rep)
return BadAlloc;
rep->type = X_Reply;
rep->sequenceNumber = client->sequence;
rep->length = npixels;
rep->width = width;
rep->height = height;
rep->x = x;
rep->y = y;
rep->xhot = pCursor->bits->xhot;
rep->yhot = pCursor->bits->yhot;
rep->cursorSerial = pCursor->serialNumber;
image = (CARD32 *) (rep + 1);
CopyCursorToImage (pCursor, image);
if (client->swapped)
{
int n;
swaps (&rep->sequenceNumber, n);
swapl (&rep->length, n);
swaps (&rep->x, n);
swaps (&rep->y, n);
swaps (&rep->width, n);
swaps (&rep->height, n);
swaps (&rep->xhot, n);
swaps (&rep->yhot, n);
swapl (&rep->cursorSerial, n);
SwapLongs (image, npixels);
}
WriteToClient(client, sizeof (xXFixesGetCursorImageReply) +
(npixels << 2), (char *) rep);
free(rep);
return Success;
}
int
SProcXFixesGetCursorImage (ClientPtr client)
{
int n;
REQUEST(xXFixesGetCursorImageReq);
swaps (&stuff->length, n);
return (*ProcXFixesVector[stuff->xfixesReqType]) (client);
}
int
ProcXFixesSetCursorName (ClientPtr client)
{
CursorPtr pCursor;
char *tchar;
REQUEST(xXFixesSetCursorNameReq);
Atom atom;
REQUEST_AT_LEAST_SIZE(xXFixesSetCursorNameReq);
VERIFY_CURSOR(pCursor, stuff->cursor, client, DixSetAttrAccess);
tchar = (char *) &stuff[1];
atom = MakeAtom (tchar, stuff->nbytes, TRUE);
if (atom == BAD_RESOURCE)
return BadAlloc;
pCursor->name = atom;
return Success;
}
int
SProcXFixesSetCursorName (ClientPtr client)
{
int n;
REQUEST(xXFixesSetCursorNameReq);
swaps (&stuff->length, n);
REQUEST_AT_LEAST_SIZE(xXFixesSetCursorNameReq);
swapl (&stuff->cursor, n);
swaps (&stuff->nbytes, n);
return (*ProcXFixesVector[stuff->xfixesReqType]) (client);
}
int
ProcXFixesGetCursorName (ClientPtr client)
{
CursorPtr pCursor;
xXFixesGetCursorNameReply reply;
REQUEST(xXFixesGetCursorNameReq);
const char *str;
int len;
REQUEST_SIZE_MATCH(xXFixesGetCursorNameReq);
VERIFY_CURSOR(pCursor, stuff->cursor, client, DixGetAttrAccess);
if (pCursor->name)
str = NameForAtom (pCursor->name);
else
str = "";
len = strlen (str);
reply.type = X_Reply;
reply.length = bytes_to_int32(len);
reply.sequenceNumber = client->sequence;
reply.atom = pCursor->name;
reply.nbytes = len;
if (client->swapped)
{
int n;
swaps (&reply.sequenceNumber, n);
swapl (&reply.length, n);
swapl (&reply.atom, n);
swaps (&reply.nbytes, n);
}
WriteReplyToClient(client, sizeof(xXFixesGetCursorNameReply), &reply);
WriteToClient(client, len, str);
return Success;
}
int
SProcXFixesGetCursorName (ClientPtr client)
{
int n;
REQUEST(xXFixesGetCursorNameReq);
swaps (&stuff->length, n);
REQUEST_SIZE_MATCH(xXFixesGetCursorNameReq);
swapl (&stuff->cursor, n);
return (*ProcXFixesVector[stuff->xfixesReqType]) (client);
}
int
ProcXFixesGetCursorImageAndName (ClientPtr client)
{
/* REQUEST(xXFixesGetCursorImageAndNameReq); */
xXFixesGetCursorImageAndNameReply *rep;
CursorPtr pCursor;
CARD32 *image;
int npixels;
const char *name;
int nbytes, nbytesRound;
int width, height;
int rc, x, y;
REQUEST_SIZE_MATCH(xXFixesGetCursorImageAndNameReq);
pCursor = CursorCurrent[PickPointer(client)->id];
if (!pCursor)
return BadCursor;
rc = XaceHook(XACE_RESOURCE_ACCESS, client, pCursor->id, RT_CURSOR,
pCursor, RT_NONE, NULL, DixReadAccess|DixGetAttrAccess);
if (rc != Success)
return rc;
GetSpritePosition (PickPointer(client), &x, &y);
width = pCursor->bits->width;
height = pCursor->bits->height;
npixels = width * height;
name = pCursor->name ? NameForAtom (pCursor->name) : "";
nbytes = strlen (name);
nbytesRound = pad_to_int32(nbytes);
rep = malloc(sizeof (xXFixesGetCursorImageAndNameReply) +
npixels * sizeof (CARD32) + nbytesRound);
if (!rep)
return BadAlloc;
rep->type = X_Reply;
rep->sequenceNumber = client->sequence;
rep->length = npixels + bytes_to_int32(nbytesRound);
rep->width = width;
rep->height = height;
rep->x = x;
rep->y = y;
rep->xhot = pCursor->bits->xhot;
rep->yhot = pCursor->bits->yhot;
rep->cursorSerial = pCursor->serialNumber;
rep->cursorName = pCursor->name;
rep->nbytes = nbytes;
image = (CARD32 *) (rep + 1);
CopyCursorToImage (pCursor, image);
memcpy ((image + npixels), name, nbytes);
if (client->swapped)
{
int n;
swaps (&rep->sequenceNumber, n);
swapl (&rep->length, n);
swaps (&rep->x, n);
swaps (&rep->y, n);
swaps (&rep->width, n);
swaps (&rep->height, n);
swaps (&rep->xhot, n);
swaps (&rep->yhot, n);
swapl (&rep->cursorSerial, n);
swapl (&rep->cursorName, n);
swaps (&rep->nbytes, n);
SwapLongs (image, npixels);
}
WriteToClient(client, sizeof (xXFixesGetCursorImageAndNameReply) +
(npixels << 2) + nbytesRound, (char *) rep);
free(rep);
return Success;
}
int
SProcXFixesGetCursorImageAndName (ClientPtr client)
{
int n;
REQUEST(xXFixesGetCursorImageAndNameReq);
swaps (&stuff->length, n);
return (*ProcXFixesVector[stuff->xfixesReqType]) (client);
}
/*
* Find every cursor reference in the system, ask testCursor
* whether it should be replaced with a reference to pCursor.
*/
typedef Bool (*TestCursorFunc) (CursorPtr pOld, pointer closure);
typedef struct {
RESTYPE type;
TestCursorFunc testCursor;
CursorPtr pNew;
pointer closure;
} ReplaceCursorLookupRec, *ReplaceCursorLookupPtr;
static const RESTYPE CursorRestypes[] = {
RT_WINDOW, RT_PASSIVEGRAB, RT_CURSOR
};
#define NUM_CURSOR_RESTYPES (sizeof (CursorRestypes) / sizeof (CursorRestypes[0]))
static Bool
ReplaceCursorLookup (pointer value, XID id, pointer closure)
{
ReplaceCursorLookupPtr rcl = (ReplaceCursorLookupPtr) closure;
WindowPtr pWin;
GrabPtr pGrab;
CursorPtr pCursor = 0, *pCursorRef = 0;
XID cursor = 0;
switch (rcl->type) {
case RT_WINDOW:
pWin = (WindowPtr) value;
if (pWin->optional)
{
pCursorRef = &pWin->optional->cursor;
pCursor = *pCursorRef;
}
break;
case RT_PASSIVEGRAB:
pGrab = (GrabPtr) value;
pCursorRef = &pGrab->cursor;
pCursor = *pCursorRef;
break;
case RT_CURSOR:
pCursorRef = 0;
pCursor = (CursorPtr) value;
cursor = id;
break;
}
if (pCursor && pCursor != rcl->pNew)
{
if ((*rcl->testCursor) (pCursor, rcl->closure))
{
rcl->pNew->refcnt++;
/* either redirect reference or update resource database */
if (pCursorRef)
*pCursorRef = rcl->pNew;
else
ChangeResourceValue (id, RT_CURSOR, rcl->pNew);
FreeCursor (pCursor, cursor);
}
}
return FALSE; /* keep walking */
}
static void
ReplaceCursor (CursorPtr pCursor,
TestCursorFunc testCursor,
pointer closure)
{
int clientIndex;
int resIndex;
ReplaceCursorLookupRec rcl;
/*
* Cursors exist only in the resource database, windows and grabs.
* All of these are always pointed at by the resource database. Walk
* the whole thing looking for cursors
*/
rcl.testCursor = testCursor;
rcl.pNew = pCursor;
rcl.closure = closure;
/* for each client */
for (clientIndex = 0; clientIndex < currentMaxClients; clientIndex++)
{
if (!clients[clientIndex])
continue;
for (resIndex = 0; resIndex < NUM_CURSOR_RESTYPES; resIndex++)
{
rcl.type = CursorRestypes[resIndex];
/*
* This function walks the entire client resource database
*/
LookupClientResourceComplex (clients[clientIndex],
rcl.type,
ReplaceCursorLookup,
(pointer) &rcl);
}
}
/* this "knows" that WindowHasNewCursor doesn't depend on it's argument */
WindowHasNewCursor (screenInfo.screens[0]->root);
}
static Bool
TestForCursor (CursorPtr pCursor, pointer closure)
{
return (pCursor == (CursorPtr) closure);
}
int
ProcXFixesChangeCursor (ClientPtr client)
{
CursorPtr pSource, pDestination;
REQUEST(xXFixesChangeCursorReq);
REQUEST_SIZE_MATCH(xXFixesChangeCursorReq);
VERIFY_CURSOR (pSource, stuff->source, client,
DixReadAccess|DixGetAttrAccess);
VERIFY_CURSOR (pDestination, stuff->destination, client,
DixWriteAccess|DixSetAttrAccess);
ReplaceCursor (pSource, TestForCursor, (pointer) pDestination);
return Success;
}
int
SProcXFixesChangeCursor (ClientPtr client)
{
int n;
REQUEST(xXFixesChangeCursorReq);
swaps (&stuff->length, n);
REQUEST_SIZE_MATCH(xXFixesChangeCursorReq);
swapl (&stuff->source, n);
swapl (&stuff->destination, n);
return (*ProcXFixesVector[stuff->xfixesReqType]) (client);
}
static Bool
TestForCursorName (CursorPtr pCursor, pointer closure)
{
Atom *pName = closure;
return pCursor->name == *pName;
}
int
ProcXFixesChangeCursorByName (ClientPtr client)
{
CursorPtr pSource;
Atom name;
char *tchar;
REQUEST(xXFixesChangeCursorByNameReq);
REQUEST_FIXED_SIZE(xXFixesChangeCursorByNameReq, stuff->nbytes);
VERIFY_CURSOR(pSource, stuff->source, client,
DixReadAccess|DixGetAttrAccess);
tchar = (char *) &stuff[1];
name = MakeAtom (tchar, stuff->nbytes, FALSE);
if (name)
ReplaceCursor (pSource, TestForCursorName, &name);
return Success;
}
int
SProcXFixesChangeCursorByName (ClientPtr client)
{
int n;
REQUEST(xXFixesChangeCursorByNameReq);
swaps (&stuff->length, n);
REQUEST_AT_LEAST_SIZE (xXFixesChangeCursorByNameReq);
swapl (&stuff->source, n);
swaps (&stuff->nbytes, n);
return (*ProcXFixesVector[stuff->xfixesReqType]) (client);
}
/*
* Routines for manipulating the per-screen hide counts list.
* This list indicates which clients have requested cursor hiding
* for that screen.
*/
/* Return the screen's hide-counts list element for the given client */
static CursorHideCountPtr
findCursorHideCount (ClientPtr pClient, ScreenPtr pScreen)
{
CursorScreenPtr cs = GetCursorScreen(pScreen);
CursorHideCountPtr pChc;
for (pChc = cs->pCursorHideCounts; pChc != NULL; pChc = pChc->pNext) {
if (pChc->pClient == pClient) {
return pChc;
}
}
return NULL;
}
static int
createCursorHideCount (ClientPtr pClient, ScreenPtr pScreen)
{
CursorScreenPtr cs = GetCursorScreen(pScreen);
CursorHideCountPtr pChc;
pChc = (CursorHideCountPtr) malloc(sizeof(CursorHideCountRec));
if (pChc == NULL) {
return BadAlloc;
}
pChc->pClient = pClient;
pChc->pScreen = pScreen;
pChc->hideCount = 1;
pChc->resource = FakeClientID(pClient->index);
pChc->pNext = cs->pCursorHideCounts;
cs->pCursorHideCounts = pChc;
/*
* Create a resource for this element so it can be deleted
* when the client goes away.
*/
if (!AddResource (pChc->resource, CursorHideCountType,
(pointer) pChc)) {
free(pChc);
return BadAlloc;
}
return Success;
}
/*
* Delete the given hide-counts list element from its screen list.
*/
static void
deleteCursorHideCount (CursorHideCountPtr pChcToDel, ScreenPtr pScreen)
{
CursorScreenPtr cs = GetCursorScreen(pScreen);
CursorHideCountPtr pChc, pNext;
CursorHideCountPtr pChcLast = NULL;
pChc = cs->pCursorHideCounts;
while (pChc != NULL) {
pNext = pChc->pNext;
if (pChc == pChcToDel) {
free(pChc);
if (pChcLast == NULL) {
cs->pCursorHideCounts = pNext;
} else {
pChcLast->pNext = pNext;
}
return;
}
pChcLast = pChc;
pChc = pNext;
}
}
/*
* Delete all the hide-counts list elements for this screen.
*/
static void
deleteCursorHideCountsForScreen (ScreenPtr pScreen)
{
CursorScreenPtr cs = GetCursorScreen(pScreen);
CursorHideCountPtr pChc, pTmp;
pChc = cs->pCursorHideCounts;
while (pChc != NULL) {
pTmp = pChc->pNext;
FreeResource(pChc->resource, 0);
pChc = pTmp;
}
cs->pCursorHideCounts = NULL;
}
int
ProcXFixesHideCursor (ClientPtr client)
{
WindowPtr pWin;
CursorHideCountPtr pChc;
REQUEST(xXFixesHideCursorReq);
int ret;
REQUEST_SIZE_MATCH (xXFixesHideCursorReq);
ret = dixLookupResourceByType((pointer *)&pWin, stuff->window, RT_WINDOW,
client, DixGetAttrAccess);
if (ret != Success) {
client->errorValue = stuff->window;
return ret;
}
/*
* Has client hidden the cursor before on this screen?
* If so, just increment the count.
*/
pChc = findCursorHideCount(client, pWin->drawable.pScreen);
if (pChc != NULL) {
pChc->hideCount++;
return Success;
}
/*
* This is the first time this client has hid the cursor
* for this screen.
*/
ret = XaceHook(XACE_SCREEN_ACCESS, client, pWin->drawable.pScreen,
DixHideAccess);
if (ret != Success)
return ret;
ret = createCursorHideCount(client, pWin->drawable.pScreen);
if (ret == Success) {
DeviceIntPtr dev;
for (dev = inputInfo.devices; dev; dev = dev->next)
{
if (IsMaster(dev) && IsPointerDevice(dev))
CursorDisplayCursor(dev, pWin->drawable.pScreen, CursorCurrent[dev->id]);
}
}
return ret;
}
int
SProcXFixesHideCursor (ClientPtr client)
{
int n;
REQUEST(xXFixesHideCursorReq);
swaps (&stuff->length, n);
REQUEST_SIZE_MATCH (xXFixesHideCursorReq);
swapl (&stuff->window, n);
return (*ProcXFixesVector[stuff->xfixesReqType]) (client);
}
int
ProcXFixesShowCursor (ClientPtr client)
{
WindowPtr pWin;
CursorHideCountPtr pChc;
int rc;
REQUEST(xXFixesShowCursorReq);
REQUEST_SIZE_MATCH (xXFixesShowCursorReq);
rc = dixLookupResourceByType((pointer *)&pWin, stuff->window, RT_WINDOW,
client, DixGetAttrAccess);
if (rc != Success) {
client->errorValue = stuff->window;
return rc;
}
/*
* Has client hidden the cursor on this screen?
* If not, generate an error.
*/
pChc = findCursorHideCount(client, pWin->drawable.pScreen);
if (pChc == NULL) {
return BadMatch;
}
rc = XaceHook(XACE_SCREEN_ACCESS, client, pWin->drawable.pScreen,
DixShowAccess);
if (rc != Success)
return rc;
pChc->hideCount--;
if (pChc->hideCount <= 0) {
FreeResource(pChc->resource, 0);
}
return Success;
}
int
SProcXFixesShowCursor (ClientPtr client)
{
int n;
REQUEST(xXFixesShowCursorReq);
swaps (&stuff->length, n);
REQUEST_SIZE_MATCH (xXFixesShowCursorReq);
swapl (&stuff->window, n);
return (*ProcXFixesVector[stuff->xfixesReqType]) (client);
}
static int
CursorFreeClient (pointer data, XID id)
{
CursorEventPtr old = (CursorEventPtr) data;
CursorEventPtr *prev, e;
for (prev = &cursorEvents; (e = *prev); prev = &e->next)
{
if (e == old)
{
*prev = e->next;
free(e);
break;
}
}
return 1;
}
static int
CursorFreeHideCount (pointer data, XID id)
{
CursorHideCountPtr pChc = (CursorHideCountPtr) data;
ScreenPtr pScreen = pChc->pScreen;
DeviceIntPtr dev;
deleteCursorHideCount(pChc, pChc->pScreen);
for (dev = inputInfo.devices; dev; dev = dev->next)
{
if (IsMaster(dev) && IsPointerDevice(dev))
CursorDisplayCursor(dev, pScreen, CursorCurrent[dev->id]);
}
return 1;
}
static int
CursorFreeWindow (pointer data, XID id)
{
WindowPtr pWindow = (WindowPtr) data;
CursorEventPtr e, next;
for (e = cursorEvents; e; e = next)
{
next = e->next;
if (e->pWindow == pWindow)
{
FreeResource (e->clientResource, 0);
}
}
return 1;
}
static BOOL
barrier_is_horizontal(const struct PointerBarrier *barrier)
{
return barrier->y1 == barrier->y2;
}
static BOOL
barrier_is_vertical(const struct PointerBarrier *barrier)
{
return barrier->x1 == barrier->x2;
}
/**
* @return The set of barrier movement directions the movement vector
* x1/y1 → x2/y2 represents.
*/
int
barrier_get_direction(int x1, int y1, int x2, int y2)
{
int direction = 0;
/* which way are we trying to go */
if (x2 > x1)
direction |= BarrierPositiveX;
if (x2 < x1)
direction |= BarrierNegativeX;
if (y2 > y1)
direction |= BarrierPositiveY;
if (y2 < y1)
direction |= BarrierNegativeY;
return direction;
}
/**
* Test if the barrier may block movement in the direction defined by
* x1/y1 → x2/y2. This function only tests whether the directions could be
* blocked, it does not test if the barrier actually blocks the movement.
*
* @return TRUE if the barrier blocks the direction of movement or FALSE
* otherwise.
*/
BOOL
barrier_is_blocking_direction(const struct PointerBarrier *barrier, int direction)
{
/* Barriers define which way is ok, not which way is blocking */
return (barrier->directions & direction) != direction;
}
/**
* Test if the movement vector x1/y1 → x2/y2 is intersecting with the
* barrier. A movement vector with the startpoint or endpoint adjacent to
* the barrier itself counts as intersecting.
*
* @param x1 X start coordinate of movement vector
* @param y1 Y start coordinate of movement vector
* @param x2 X end coordinate of movement vector
* @param y2 Y end coordinate of movement vector
* @param[out] distance The distance between the start point and the
* intersection with the barrier (if applicable).
* @return TRUE if the barrier intersects with the given vector
*/
BOOL
barrier_is_blocking(const struct PointerBarrier *barrier,
int x1, int y1, int x2, int y2,
double *distance)
{
BOOL rc = FALSE;
float ua, ub, ud;
int dir = barrier_get_direction(x1, y1, x2, y2);
/* Algorithm below doesn't handle edge cases well, hence the extra
* checks. */
if (barrier_is_vertical(barrier)) {
/* handle immediate barrier adjacency, moving away */
if (dir & BarrierPositiveX && x1 == barrier->x1)
return FALSE;
if (dir & BarrierNegativeX && x1 == (barrier->x1 - 1))
return FALSE;
/* startpoint adjacent to barrier, moving towards -> block */
if (x1 == barrier->x1 && y1 >= barrier->y1 && y1 <= barrier->y2) {
*distance = 0;
return TRUE;
}
} else {
/* handle immediate barrier adjacency, moving away */
if (dir & BarrierPositiveY && y1 == barrier->y1)
return FALSE;
if (dir & BarrierNegativeY && y1 == (barrier->y1 - 1))
return FALSE;
/* startpoint adjacent to barrier, moving towards -> block */
if (y1 == barrier->y1 && x1 >= barrier->x1 && x1 <= barrier->x2) {
*distance = 0;
return TRUE;
}
}
/* not an edge case, compute distance */
ua = 0;
ud = (barrier->y2 - barrier->y1) * (x2 - x1) - (barrier->x2 - barrier->x1) * (y2 - y1);
if (ud != 0) {
ua = ((barrier->x2 - barrier->x1) * (y1 - barrier->y1) -
(barrier->y2 - barrier->y1) * (x1 - barrier->x1)) / ud;
ub = ((x2 - x1) * (y1 - barrier->y1) -
(y2 - y1) * (x1 - barrier->x1)) / ud;
if (ua < 0 || ua > 1 || ub < 0 || ub > 1)
ua = 0;
}
if (ua > 0 && ua <= 1)
{
double ix = barrier->x1 + ua * (barrier->x2 - barrier->x1);
double iy = barrier->y1 + ua * (barrier->y2 - barrier->y1);
*distance = sqrt(pow(x1 - ix, 2) + pow(y1 - iy, 2));
rc = TRUE;
}
return rc;
}
/**
* Find the nearest barrier that is blocking movement from x1/y1 to x2/y2.
*
* @param dir Only barriers blocking movement in direction dir are checked
* @param x1 X start coordinate of movement vector
* @param y1 Y start coordinate of movement vector
* @param x2 X end coordinate of movement vector
* @param y2 Y end coordinate of movement vector
* @return The barrier nearest to the movement origin that blocks this movement.
*/
static struct PointerBarrier*
barrier_find_nearest(CursorScreenPtr cs, int dir,
int x1, int y1, int x2, int y2)
{
struct PointerBarrierClient *c;
struct PointerBarrier *nearest = NULL;
double min_distance = INT_MAX; /* can't get higher than that in X anyway */
list_for_each_entry(c, &cs->barriers, entry) {
struct PointerBarrier *b = &c->barrier;
double distance;
if (!barrier_is_blocking_direction(b, dir))
continue;
if (barrier_is_blocking(b, x1, y1, x2, y2, &distance))
{
if (min_distance > distance)
{
min_distance = distance;
nearest = b;
}
}
}
return nearest;
}
/**
* Clamp to the given barrier given the movement direction specified in dir.
*
* @param barrier The barrier to clamp to
* @param dir The movement direction
* @param[out] x The clamped x coordinate.
* @param[out] y The clamped x coordinate.
*/
void
barrier_clamp_to_barrier(struct PointerBarrier *barrier, int dir, int *x, int *y)
{
if (barrier_is_vertical(barrier))
{
if ((dir & BarrierNegativeX) & ~barrier->directions)
*x = barrier->x1;
if ((dir & BarrierPositiveX) & ~barrier->directions)
*x = barrier->x1 - 1;
}
if (barrier_is_horizontal(barrier))
{
if ((dir & BarrierNegativeY) & ~barrier->directions)
*y = barrier->y1;
if ((dir & BarrierPositiveY) & ~barrier->directions)
*y = barrier->y1 - 1;
}
}
static void
CursorConstrainCursorHarder(DeviceIntPtr dev, ScreenPtr screen, int mode, int *x, int *y)
{
CursorScreenPtr cs = GetCursorScreen(screen);
if (!list_is_empty(&cs->barriers) && !IsFloating(dev) && mode == Relative) {
int ox, oy;
int dir;
struct PointerBarrier *nearest = NULL;
/* where are we coming from */
miPointerGetPosition(dev, &ox, &oy);
/* How this works:
* Given the origin and the movement vector, get the nearest barrier
* to the origin that is blocking the movement.
* Clamp to that barrier.
* Then, check from the clamped intersection to the original
* destination, again finding the nearest barrier and clamping.
*/
dir = barrier_get_direction(ox, oy, *x, *y);
nearest = barrier_find_nearest(cs, dir, ox, oy, *x, *y);
if (nearest) {
barrier_clamp_to_barrier(nearest, dir, x, y);
if (barrier_is_vertical(nearest)) {
dir &= ~(BarrierNegativeX | BarrierPositiveX);
ox = *x;
} else if (barrier_is_horizontal(nearest)) {
dir &= ~(BarrierNegativeY | BarrierPositiveY);
oy = *y;
}
nearest = barrier_find_nearest(cs, dir, ox, oy, *x, *y);
if (nearest) {
barrier_clamp_to_barrier(nearest, dir, x, y);
}
}
}
if (cs->ConstrainCursorHarder) {
screen->ConstrainCursorHarder = cs->ConstrainCursorHarder;
screen->ConstrainCursorHarder(dev, screen, mode, x, y);
screen->ConstrainCursorHarder = CursorConstrainCursorHarder;
}
}
static struct PointerBarrierClient *
CreatePointerBarrierClient(ScreenPtr screen, ClientPtr client,
xXFixesCreatePointerBarrierReq *stuff)
{
CursorScreenPtr cs = GetCursorScreen(screen);
struct PointerBarrierClient *ret = malloc(sizeof(*ret));
if (ret) {
ret->screen = screen;
ret->barrier.x1 = min(stuff->x1, stuff->x2);
ret->barrier.x2 = max(stuff->x1, stuff->x2);
ret->barrier.y1 = min(stuff->y1, stuff->y2);
ret->barrier.y2 = max(stuff->y1, stuff->y2);
ret->barrier.directions = stuff->directions & 0x0f;
if (barrier_is_horizontal(&ret->barrier))
ret->barrier.directions &= ~(BarrierPositiveX | BarrierNegativeX);
if (barrier_is_vertical(&ret->barrier))
ret->barrier.directions &= ~(BarrierPositiveY | BarrierNegativeY);
list_add(&ret->entry, &cs->barriers);
}
return ret;
}
int
ProcXFixesCreatePointerBarrier (ClientPtr client)
{
int err;
WindowPtr pWin;
struct PointerBarrierClient *barrier;
struct PointerBarrier b;
REQUEST (xXFixesCreatePointerBarrierReq);
REQUEST_SIZE_MATCH(xXFixesCreatePointerBarrierReq);
LEGAL_NEW_RESOURCE(stuff->barrier, client);
err = dixLookupWindow(&pWin, stuff->window, client, DixReadAccess);
if (err != Success) {
client->errorValue = stuff->window;
return err;
}
/* This sure does need fixing. */
if (stuff->num_devices)
return BadImplementation;
b.x1 = stuff->x1;
b.x2 = stuff->x2;
b.y1 = stuff->y1;
b.y2 = stuff->y2;
if (!barrier_is_horizontal(&b) && !barrier_is_vertical(&b))
return BadValue;
/* no 0-sized barriers */
if (barrier_is_horizontal(&b) && barrier_is_vertical(&b))
return BadValue;
if (!(barrier = CreatePointerBarrierClient(pWin->drawable.pScreen,
client, stuff)))
return BadAlloc;
if (!AddResource(stuff->barrier, PointerBarrierType, &barrier->barrier))
return BadAlloc;
return Success;
}
int
SProcXFixesCreatePointerBarrier (ClientPtr client)
{
int n;
REQUEST(xXFixesCreatePointerBarrierReq);
swaps(&stuff->length, n);
REQUEST_SIZE_MATCH(xXFixesCreatePointerBarrierReq);
swapl(&stuff->barrier, n);
swapl(&stuff->window, n);
swaps(&stuff->x1, n);
swaps(&stuff->y1, n);
swaps(&stuff->x2, n);
swaps(&stuff->y2, n);
swapl(&stuff->directions, n);
return ProcXFixesVector[stuff->xfixesReqType](client);
}
static int
CursorFreeBarrier(void *data, XID id)
{
struct PointerBarrierClient *b = NULL, *barrier;
ScreenPtr screen;
CursorScreenPtr cs;
barrier = container_of(data, struct PointerBarrierClient, barrier);
screen = barrier->screen;
cs = GetCursorScreen(screen);
/* find and unlink from the screen private */
list_for_each_entry(b, &cs->barriers, entry) {
if (b == barrier) {
list_del(&b->entry);
break;
}
}
free(barrier);
return Success;
}
int
ProcXFixesDestroyPointerBarrier (ClientPtr client)
{
int err;
void *barrier;
REQUEST (xXFixesDestroyPointerBarrierReq);
REQUEST_SIZE_MATCH(xXFixesDestroyPointerBarrierReq);
err = dixLookupResourceByType((void **)&barrier, stuff->barrier,
PointerBarrierType, client,
DixDestroyAccess);
if (err != Success) {
client->errorValue = stuff->barrier;
return err;
}
FreeResource(stuff->barrier, RT_NONE);
return Success;
}
int
SProcXFixesDestroyPointerBarrier (ClientPtr client)
{
int n;
REQUEST(xXFixesDestroyPointerBarrierReq);
swaps(&stuff->length, n);
REQUEST_SIZE_MATCH(xXFixesDestroyPointerBarrierReq);
swapl(&stuff->barrier, n);
return ProcXFixesVector[stuff->xfixesReqType](client);
}
Bool
XFixesCursorInit (void)
{
int i;
if (party_like_its_1989)
CursorVisible = EnableCursor;
if (!dixRegisterPrivateKey(&CursorScreenPrivateKeyRec, PRIVATE_SCREEN, 0))
return FALSE;
for (i = 0; i < screenInfo.numScreens; i++)
{
ScreenPtr pScreen = screenInfo.screens[i];
CursorScreenPtr cs;
cs = (CursorScreenPtr) calloc(1, sizeof (CursorScreenRec));
if (!cs)
return FALSE;
list_init(&cs->barriers);
Wrap (cs, pScreen, CloseScreen, CursorCloseScreen);
Wrap (cs, pScreen, DisplayCursor, CursorDisplayCursor);
Wrap (cs, pScreen, ConstrainCursorHarder, CursorConstrainCursorHarder);
cs->pCursorHideCounts = NULL;
SetCursorScreen (pScreen, cs);
}
CursorClientType = CreateNewResourceType(CursorFreeClient,
"XFixesCursorClient");
CursorHideCountType = CreateNewResourceType(CursorFreeHideCount,
"XFixesCursorHideCount");
CursorWindowType = CreateNewResourceType(CursorFreeWindow,
"XFixesCursorWindow");
PointerBarrierType = CreateNewResourceType(CursorFreeBarrier,
"XFixesPointerBarrier");
return CursorClientType && CursorHideCountType && CursorWindowType &&
PointerBarrierType;
}
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