geext.c 10.4 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237
/* 

Copyright 2007 Peter Hutterer <peter@cs.unisa.edu.au>

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 AUTHOR 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 author 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 author.

*/


#ifdef HAVE_DIX_CONFIG_H
#include <dix-config.h>
#endif
#include "windowstr.h"
#include <X11/extensions/ge.h>

#include "geint.h"
#include "geext.h"

int GEEventBase;
int GEErrorBase;
int GEClientPrivateIndex;
int GEEventType; /* The opcode for all GenericEvents will have. */

/* Struct to keep information about registered extensions
 */
typedef struct _GEExtension {
    /* event swap function */
    void (*evswap)(xGenericEvent* from, xGenericEvent* to);
} GEExtension, *GEExtensionPtr;

/* All registered extensions */
static GEExtension GEExtensions[MAXEXTENSIONS];

/* Major available requests */
static const int version_requests[] = {
    X_GEQueryVersion,	/* before client sends QueryVersion */
    X_GEQueryVersion,	/* must be set to last request in version 1 */
};

/* Forward declarations */
static void SGEGenericEvent(xEvent* from, xEvent* to);

#define NUM_VERSION_REQUESTS	(sizeof (version_requests) / sizeof (version_requests[0]))

/************************************************************/
/*                request handlers                          */
/************************************************************/

static int ProcGEQueryVersion(ClientPtr client)
{
    int n;
    GEClientInfoPtr pGEClient = GEGetClient(client);
    xGEQueryVersionReply rep;
    REQUEST(xGEQueryVersionReq);

    REQUEST_SIZE_MATCH(xGEQueryVersionReq);

    rep.repType = X_Reply;
    rep.RepType = X_GEQueryVersion;
    rep.length = 0;
    rep.sequenceNumber = client->sequence;

    if (stuff->majorVersion < GE_MAJOR) {
        rep.majorVersion = stuff->majorVersion;
        rep.minorVersion = stuff->minorVersion;
    } else {
        rep.majorVersion = GE_MAJOR;
        if (stuff->majorVersion == GE_MAJOR && 
                stuff->minorVersion < GE_MINOR)
            rep.minorVersion = stuff->minorVersion;
        else
            rep.minorVersion = GE_MINOR;
    }

    pGEClient->major_version = rep.majorVersion;
    pGEClient->minor_version = rep.minorVersion;

    if (client->swapped)
    {
    	swaps(&rep.sequenceNumber, n);
    	swapl(&rep.length, n);
        swaps(&rep.majorVersion, n);
        swaps(&rep.minorVersion, n);
    }


    WriteToClient(client, sizeof(xGEQueryVersionReply), (char*)&rep);
    return(client->noClientException);
}

int (*ProcGEVector[GENumberRequests])(ClientPtr) = {
    /* Version 1.0 */
    ProcGEQueryVersion
};

/************************************************************/
/*                swapped request handlers                  */
/************************************************************/
static int
SProcGEQueryVersion(ClientPtr client)
{
    int n;
    REQUEST(xGEQueryVersionReq);

    swaps(&stuff->length, n);
    REQUEST_SIZE_MATCH(xGEQueryVersionReq);
    swaps(&stuff->majorVersion, n);
    swaps(&stuff->minorVersion, n);
    return(*ProcGEVector[stuff->ReqType])(client);
}

int (*SProcGEVector[GENumberRequests])(ClientPtr) = {
    /* Version 1.0 */
    SProcGEQueryVersion
};


/************************************************************/
/*                callbacks                                 */
/************************************************************/

/* dispatch requests */
static int 
ProcGEDispatch(ClientPtr client)
{
    GEClientInfoPtr pGEClient = GEGetClient(client);
    REQUEST(xGEReq);

    if (pGEClient->major_version >= NUM_VERSION_REQUESTS)
        return BadRequest;
    if (stuff->ReqType > version_requests[pGEClient->major_version])
        return BadRequest;

    return (ProcGEVector[stuff->ReqType])(client);
}

/* dispatch swapped requests */
static int
SProcGEDispatch(ClientPtr client)
{
    REQUEST(xGEReq);
    if (stuff->ReqType >= GENumberRequests)
        return BadRequest;
    return (*SProcGEVector[stuff->ReqType])(client);
}

/* new client callback */
static void GEClientCallback(CallbackListPtr *list,
        pointer closure,
        pointer data)
{
    NewClientInfoRec	*clientinfo = (NewClientInfoRec *) data;
    ClientPtr		pClient = clientinfo->client;
    GEClientInfoPtr     pGEClient = GEGetClient(pClient);

    pGEClient->major_version = 0;
    pGEClient->minor_version = 0;
}

/* reset extension */
static void
GEResetProc(ExtensionEntry *extEntry)
{
    DeleteCallback(&ClientStateCallback, GEClientCallback, 0);
    EventSwapVector[GenericEvent] = NotImplemented;

    GEEventBase = 0;
    GEErrorBase = 0;
    GEEventType = 0;
}

/*  Calls the registered event swap function for the extension. */
static void 
SGEGenericEvent(xEvent* from, xEvent* to)
{
    xGenericEvent* gefrom = (xGenericEvent*)from;
    xGenericEvent* geto = (xGenericEvent*)to;

    if (gefrom->extension > MAXEXTENSIONS)
    {
        ErrorF("GE: Invalid extension offset for event.\n");
        return;
    }

    if (GEExtensions[gefrom->extension & 0x7F].evswap)
        GEExtensions[gefrom->extension & 0x7F].evswap(gefrom, geto);
}

/* init extension, register at server */
void 
GEExtensionInit(void)
{
    ExtensionEntry *extEntry;

    GEClientPrivateIndex = AllocateClientPrivateIndex(); 
    if (!AllocateClientPrivate(GEClientPrivateIndex, 
                               sizeof(GEClientRec)))
    {
        FatalError("GEExtensionInit: Alloc client private failed.\n");
    }

    if(!AddCallback(&ClientStateCallback, GEClientCallback, 0))
    {
        FatalError("GEExtensionInit: register client callback failed.\n");
    }

    if((extEntry = AddExtension(GE_NAME, 
                        GENumberEvents, GENumberErrors, 
                        ProcGEDispatch, SProcGEDispatch, 
                        GEResetProc, StandardMinorOpcode)) != 0)
    {
        GEEventBase = extEntry->eventBase;
        GEErrorBase = extEntry->errorBase;
        GEEventType = GEEventBase;

        memset(GEExtensions, 0, sizeof(GEExtensions));

Peter Hutterer's avatar
Peter Hutterer committed
238
        EventSwapVector[X_GenericEvent] = (EventSwapPtr) SGEGenericEvent;
239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383
    } else {
        FatalError("GEInit: AddExtensions failed.\n");
    }

}

/************************************************************/
/*                interface for extensions                  */
/************************************************************/

/* Register extension with GE. 
 * Requires the event swap function as parameter. The function will be called
 * each time an event is sent to a client with different byte order.
 * Returns extension offset. This offset is to be used in all generic events
 * sent to the client.
 */
void GERegisterExtension(
        int extension, 
        void (*ev_swap)(xGenericEvent* from, xGenericEvent* to)
        )
{
    if ((extension & 0x7F) >=  MAXEXTENSIONS)
        FatalError("GE: extension > MAXEXTENSIONS. This should not happen.\n");

    /* extension opcodes are > 128, might as well save some space here */
    GEExtensions[extension & 0x7f].evswap = ev_swap;
}


/* Sets type and extension field for a generic event. This is just an
 * auxiliary function, extensions could do it manually too. */
void GEInitEvent(xGenericEvent* ev, int extension)
{
    ev->type = GenericEvent;
    ev->extension = extension;
    ev->length = 0;
}

/* Recalculates the summary mask for the window. */
static void 
GERecalculateWinMask(WindowPtr pWin)
{
    int i;
    GEClientPtr it;
    GEEventMasksPtr evmasks;

    if (!pWin->optional)
        return;

    evmasks = pWin->optional->geMasks;

    for (i = 0; i < MAXEXTENSIONS; i++)
    {
        evmasks->eventMasks[i] = 0;
    }

    it = pWin->optional->geMasks->geClients;
    while(it)
    {
        for (i = 0; i < MAXEXTENSIONS; i++)
        {
            evmasks->eventMasks[i] |= it->eventMask[i];
        }
        it = it->next;
    }
}

/* Set generic event mask for given window. */
void GEWindowSetMask(ClientPtr pClient, WindowPtr pWin, int extension, Mask mask)
{
    GEClientPtr cli;

    extension = (extension & 0x7F);

    if (extension > MAXEXTENSIONS)
    {
        ErrorF("Invalid extension number.\n");
        return;
    }

    if (!pWin->optional && !MakeWindowOptional(pWin))
    {
        ErrorF("GE: Could not make window optional.\n");
        return;
    }

    if (mask)
    {
        GEEventMasksPtr evmasks = pWin->optional->geMasks;

        /* check for existing client */
        cli = evmasks->geClients;
        while(cli)
        {
            if (cli->client == pClient)
                break;
            cli = cli->next;
        }
        if (!cli)
        {
            /* new client */
            cli  = (GEClientPtr)xcalloc(1, sizeof(GEClientRec));
            if (!cli)
            {
                ErrorF("GE: Insufficient memory to alloc client.\n");
                return;
            }
            cli->next = evmasks->geClients;
            cli->client = pClient;
            evmasks->geClients = cli;
        }
        cli->eventMask[extension] = mask;
    } else
    {
        /* remove client. */
        cli = pWin->optional->geMasks->geClients;
        if (cli->client == pClient)
        {
            pWin->optional->geMasks->geClients = cli->next;
            xfree(cli);
        } else 
        { 
            GEClientPtr prev = cli;
            cli = cli->next;

            while(cli)
            {
                if (cli->client == pClient)
                {
                    prev->next = cli->next;
                    xfree(cli);
                    break;
                }
                prev = cli;
                cli = cli->next;
            }
        }
        if (!cli)
            return;
    }

    GERecalculateWinMask(pWin);
}