xenocara/xserver/dix/eventconvert.c

/*
 * Copyright © 2009 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.
 *
 */

/**
 * @file eventconvert.c
 * This file contains event conversion routines from InternalEvent to the
 * matching protocol events.
 */

#ifdef HAVE_DIX_CONFIG_H
#include <dix-config.h>
#endif

#include <stdint.h>
#include <X11/X.h>
#include <X11/extensions/XIproto.h>
#include <X11/extensions/XI2proto.h>
#include <X11/extensions/XI.h>
#include <X11/extensions/XI2.h>

#include "dix.h"
#include "inputstr.h"
#include "misc.h"
#include "eventstr.h"
#include "exevents.h"
#include "exglobals.h"
#include "eventconvert.h"
#include "inpututils.h"
#include "xiquerydevice.h"
#include "xkbsrv.h"
#include "inpututils.h"

static int countValuators(DeviceEvent *ev, int *first);
static int getValuatorEvents(DeviceEvent *ev, deviceValuator * xv);
static int eventToKeyButtonPointer(DeviceEvent *ev, xEvent **xi, int *count);
static int eventToDeviceChanged(DeviceChangedEvent *ev, xEvent **dcce);
static int eventToDeviceEvent(DeviceEvent *ev, xEvent **xi);
static int eventToRawEvent(RawDeviceEvent *ev, xEvent **xi);
static int eventToBarrierEvent(BarrierEvent *ev, xEvent **xi);
static int eventToTouchOwnershipEvent(TouchOwnershipEvent *ev, xEvent **xi);

/* Do not use, read comments below */
BOOL EventIsKeyRepeat(xEvent *event);

/**
 * Hack to allow detectable autorepeat for core and XI1 events.
 * The sequence number is unused until we send to the client and can be
 * misused to store data. More or less, anyway.
 *
 * Do not use this. It may change any time without warning, eat your babies
 * and piss on your cat.
 */
static void
EventSetKeyRepeatFlag(xEvent *event, BOOL on)
{
    event->u.u.sequenceNumber = on;
}

/**
 * Check if the event was marked as a repeat event before.
 * NOTE: This is a nasty hack and should NOT be used by anyone else but
 * TryClientEvents.
 */
BOOL
EventIsKeyRepeat(xEvent *event)
{
    return ! !event->u.u.sequenceNumber;
}

/**
 * Convert the given event to the respective core event.
 *
 * Return values:
 * Success ... core contains the matching core event.
 * BadValue .. One or more values in the internal event are invalid.
 * BadMatch .. The event has no core equivalent.
 *
 * @param[in] event The event to convert into a core event.
 * @param[in] core The memory location to store the core event at.
 * @return Success or the matching error code.
 */
int
EventToCore(InternalEvent *event, xEvent **core_out, int *count_out)
{
    xEvent *core = NULL;
    int count = 0;
    int ret = BadImplementation;

    switch (event->any.type) {
    case ET_Motion:
    {
        DeviceEvent *e = &event->device_event;

        /* Don't create core motion event if neither x nor y are
         * present */
        if (!BitIsOn(e->valuators.mask, 0) && !BitIsOn(e->valuators.mask, 1)) {
            ret = BadMatch;
            goto out;
        }
    }
        /* fallthrough */
    case ET_ButtonPress:
    case ET_ButtonRelease:
    case ET_KeyPress:
    case ET_KeyRelease:
    {
        DeviceEvent *e = &event->device_event;

        if (e->detail.key > 0xFF) {
            ret = BadMatch;
            goto out;
        }

        core = calloc(1, sizeof(*core));
        if (!core)
            return BadAlloc;
        count = 1;
        core->u.u.type = e->type - ET_KeyPress + KeyPress;
        core->u.u.detail = e->detail.key & 0xFF;
        core->u.keyButtonPointer.time = e->time;
        core->u.keyButtonPointer.rootX = e->root_x;
        core->u.keyButtonPointer.rootY = e->root_y;
        core->u.keyButtonPointer.state = e->corestate;
        core->u.keyButtonPointer.root = e->root;
        EventSetKeyRepeatFlag(core, (e->type == ET_KeyPress && e->key_repeat));
        ret = Success;
    }
        break;
    case ET_ProximityIn:
    case ET_ProximityOut:
    case ET_RawKeyPress:
    case ET_RawKeyRelease:
    case ET_RawButtonPress:
    case ET_RawButtonRelease:
    case ET_RawMotion:
    case ET_RawTouchBegin:
    case ET_RawTouchUpdate:
    case ET_RawTouchEnd:
    case ET_TouchBegin:
    case ET_TouchUpdate:
    case ET_TouchEnd:
    case ET_TouchOwnership:
    case ET_BarrierHit:
    case ET_BarrierLeave:
        ret = BadMatch;
        break;
    default:
        /* XXX: */
        ErrorF("[dix] EventToCore: Not implemented yet \n");
        ret = BadImplementation;
    }

 out:
    *core_out = core;
    *count_out = count;
    return ret;
}

/**
 * Convert the given event to the respective XI 1.x event and store it in
 * xi. xi is allocated on demand and must be freed by the caller.
 * count returns the number of events in xi. If count is 1, and the type of
 * xi is GenericEvent, then xi may be larger than 32 bytes.
 *
 * Return values:
 * Success ... core contains the matching core event.
 * BadValue .. One or more values in the internal event are invalid.
 * BadMatch .. The event has no XI equivalent.
 *
 * @param[in] ev The event to convert into an XI 1 event.
 * @param[out] xi Future memory location for the XI event.
 * @param[out] count Number of elements in xi.
 *
 * @return Success or the error code.
 */
int
EventToXI(InternalEvent *ev, xEvent **xi, int *count)
{
    switch (ev->any.type) {
    case ET_Motion:
    case ET_ButtonPress:
    case ET_ButtonRelease:
    case ET_KeyPress:
    case ET_KeyRelease:
    case ET_ProximityIn:
    case ET_ProximityOut:
        return eventToKeyButtonPointer(&ev->device_event, xi, count);
    case ET_DeviceChanged:
    case ET_RawKeyPress:
    case ET_RawKeyRelease:
    case ET_RawButtonPress:
    case ET_RawButtonRelease:
    case ET_RawMotion:
    case ET_RawTouchBegin:
    case ET_RawTouchUpdate:
    case ET_RawTouchEnd:
    case ET_TouchBegin:
    case ET_TouchUpdate:
    case ET_TouchEnd:
    case ET_TouchOwnership:
    case ET_BarrierHit:
    case ET_BarrierLeave:
        *count = 0;
        *xi = NULL;
        return BadMatch;
    default:
        break;
    }

    ErrorF("[dix] EventToXI: Not implemented for %d \n", ev->any.type);
    return BadImplementation;
}

/**
 * Convert the given event to the respective XI 2.x event and store it in xi.
 * xi is allocated on demand and must be freed by the caller.
 *
 * Return values:
 * Success ... core contains the matching core event.
 * BadValue .. One or more values in the internal event are invalid.
 * BadMatch .. The event has no XI2 equivalent.
 *
 * @param[in] ev The event to convert into an XI2 event
 * @param[out] xi Future memory location for the XI2 event.
 *
 * @return Success or the error code.
 */
int
EventToXI2(InternalEvent *ev, xEvent **xi)
{
    switch (ev->any.type) {
        /* Enter/FocusIn are for grabs. We don't need an actual event, since
         * the real events delivered are triggered elsewhere */
    case ET_Enter:
    case ET_FocusIn:
        *xi = NULL;
        return Success;
    case ET_Motion:
    case ET_ButtonPress:
    case ET_ButtonRelease:
    case ET_KeyPress:
    case ET_KeyRelease:
    case ET_TouchBegin:
    case ET_TouchUpdate:
    case ET_TouchEnd:
        return eventToDeviceEvent(&ev->device_event, xi);
    case ET_TouchOwnership:
        return eventToTouchOwnershipEvent(&ev->touch_ownership_event, xi);
    case ET_ProximityIn:
    case ET_ProximityOut:
        *xi = NULL;
        return BadMatch;
    case ET_DeviceChanged:
        return eventToDeviceChanged(&ev->changed_event, xi);
    case ET_RawKeyPress:
    case ET_RawKeyRelease:
    case ET_RawButtonPress:
    case ET_RawButtonRelease:
    case ET_RawMotion:
    case ET_RawTouchBegin:
    case ET_RawTouchUpdate:
    case ET_RawTouchEnd:
        return eventToRawEvent(&ev->raw_event, xi);
    case ET_BarrierHit:
    case ET_BarrierLeave:
        return eventToBarrierEvent(&ev->barrier_event, xi);
    default:
        break;
    }

    ErrorF("[dix] EventToXI2: Not implemented for %d \n", ev->any.type);
    return BadImplementation;
}

static int
eventToKeyButtonPointer(DeviceEvent *ev, xEvent **xi, int *count)
{
    int num_events;
    int first;                  /* dummy */
    deviceKeyButtonPointer *kbp;

    /* Sorry, XI 1.x protocol restrictions. */
    if (ev->detail.button > 0xFF || ev->deviceid >= 0x80) {
        *count = 0;
        return Success;
    }

    num_events = (countValuators(ev, &first) + 5) / 6;  /* valuator ev */
    if (num_events <= 0) {
        switch (ev->type) {
        case ET_KeyPress:
        case ET_KeyRelease:
        case ET_ButtonPress:
        case ET_ButtonRelease:
            /* no axes is ok */
            break;
        case ET_Motion:
        case ET_ProximityIn:
        case ET_ProximityOut:
            *count = 0;
            return BadMatch;
        default:
            *count = 0;
            return BadImplementation;
        }
    }

    num_events++;               /* the actual event event */

    *xi = calloc(num_events, sizeof(xEvent));
    if (!(*xi)) {
        return BadAlloc;
    }

    kbp = (deviceKeyButtonPointer *) (*xi);
    kbp->detail = ev->detail.button;
    kbp->time = ev->time;
    kbp->root = ev->root;
    kbp->root_x = ev->root_x;
    kbp->root_y = ev->root_y;
    kbp->deviceid = ev->deviceid;
    kbp->state = ev->corestate;
    EventSetKeyRepeatFlag((xEvent *) kbp,
                          (ev->type == ET_KeyPress && ev->key_repeat));

    if (num_events > 1)
        kbp->deviceid |= MORE_EVENTS;

    switch (ev->type) {
    case ET_Motion:
        kbp->type = DeviceMotionNotify;
        break;
    case ET_ButtonPress:
        kbp->type = DeviceButtonPress;
        break;
    case ET_ButtonRelease:
        kbp->type = DeviceButtonRelease;
        break;
    case ET_KeyPress:
        kbp->type = DeviceKeyPress;
        break;
    case ET_KeyRelease:
        kbp->type = DeviceKeyRelease;
        break;
    case ET_ProximityIn:
        kbp->type = ProximityIn;
        break;
    case ET_ProximityOut:
        kbp->type = ProximityOut;
        break;
    default:
        break;
    }

    if (num_events > 1) {
        getValuatorEvents(ev, (deviceValuator *) (kbp + 1));
    }

    *count = num_events;
    return Success;
}

/**
 * Set first to the first valuator in the event ev and return the number of
 * valuators from first to the last set valuator.
 */
static int
countValuators(DeviceEvent *ev, int *first)
{
    int first_valuator = -1, last_valuator = -1, num_valuators = 0;
    int i;

    for (i = 0; i < sizeof(ev->valuators.mask) * 8; i++) {
        if (BitIsOn(ev->valuators.mask, i)) {
            if (first_valuator == -1)
                first_valuator = i;
            last_valuator = i;
        }
    }

    if (first_valuator != -1) {
        num_valuators = last_valuator - first_valuator + 1;
        *first = first_valuator;
    }

    return num_valuators;
}

static int
getValuatorEvents(DeviceEvent *ev, deviceValuator * xv)
{
    int i;
    int state = 0;
    int first_valuator, num_valuators;

    num_valuators = countValuators(ev, &first_valuator);
    if (num_valuators > 0) {
        DeviceIntPtr dev = NULL;

        dixLookupDevice(&dev, ev->deviceid, serverClient, DixUseAccess);
        /* State needs to be assembled BEFORE the device is updated. */
        state = (dev &&
                 dev->key) ? XkbStateFieldFromRec(&dev->key->xkbInfo->
                                                  state) : 0;
        state |= (dev && dev->button) ? (dev->button->state) : 0;
    }

    for (i = 0; i < num_valuators; i += 6, xv++) {
        INT32 *valuators = &xv->valuator0;      // Treat all 6 vals as an array
        int j;

        xv->type = DeviceValuator;
        xv->first_valuator = first_valuator + i;
        xv->num_valuators = ((num_valuators - i) > 6) ? 6 : (num_valuators - i);
        xv->deviceid = ev->deviceid;
        xv->device_state = state;

        /* Unset valuators in masked valuator events have the proper data values
         * in the case of an absolute axis in between two set valuators. */
        for (j = 0; j < xv->num_valuators; j++)
            valuators[j] = ev->valuators.data[xv->first_valuator + j];

        if (i + 6 < num_valuators)
            xv->deviceid |= MORE_EVENTS;
    }

    return (num_valuators + 5) / 6;
}

static int
appendKeyInfo(DeviceChangedEvent *dce, xXIKeyInfo * info)
{
    uint32_t *kc;
    int i;

    info->type = XIKeyClass;
    info->num_keycodes = dce->keys.max_keycode - dce->keys.min_keycode + 1;
    info->length = sizeof(xXIKeyInfo) / 4 + info->num_keycodes;
    info->sourceid = dce->sourceid;

    kc = (uint32_t *) &info[1];
    for (i = 0; i < info->num_keycodes; i++)
        *kc++ = i + dce->keys.min_keycode;

    return info->length * 4;
}

static int
appendButtonInfo(DeviceChangedEvent *dce, xXIButtonInfo * info)
{
    unsigned char *bits;
    int mask_len;

    mask_len = bytes_to_int32(bits_to_bytes(dce->buttons.num_buttons));

    info->type = XIButtonClass;
    info->num_buttons = dce->buttons.num_buttons;
    info->length = bytes_to_int32(sizeof(xXIButtonInfo)) +
        info->num_buttons + mask_len;
    info->sourceid = dce->sourceid;

    bits = (unsigned char *) &info[1];
    memset(bits, 0, mask_len * 4);
    /* FIXME: is_down? */

    bits += mask_len * 4;
    memcpy(bits, dce->buttons.names, dce->buttons.num_buttons * sizeof(Atom));

    return info->length * 4;
}

static int
appendValuatorInfo(DeviceChangedEvent *dce, xXIValuatorInfo * info,
                   int axisnumber)
{
    info->type = XIValuatorClass;
    info->length = sizeof(xXIValuatorInfo) / 4;
    info->label = dce->valuators[axisnumber].name;
    info->min.integral = dce->valuators[axisnumber].min;
    info->min.frac = 0;
    info->max.integral = dce->valuators[axisnumber].max;
    info->max.frac = 0;
    info->value = double_to_fp3232(dce->valuators[axisnumber].value);
    info->resolution = dce->valuators[axisnumber].resolution;
    info->number = axisnumber;
    info->mode = dce->valuators[axisnumber].mode;
    info->sourceid = dce->sourceid;

    return info->length * 4;
}

static int
appendScrollInfo(DeviceChangedEvent *dce, xXIScrollInfo * info, int axisnumber)
{
    if (dce->valuators[axisnumber].scroll.type == SCROLL_TYPE_NONE)
        return 0;

    info->type = XIScrollClass;
    info->length = sizeof(xXIScrollInfo) / 4;
    info->number = axisnumber;
    switch (dce->valuators[axisnumber].scroll.type) {
    case SCROLL_TYPE_VERTICAL:
        info->scroll_type = XIScrollTypeVertical;
        break;
    case SCROLL_TYPE_HORIZONTAL:
        info->scroll_type = XIScrollTypeHorizontal;
        break;
    default:
        ErrorF("[Xi] Unknown scroll type %d. This is a bug.\n",
               dce->valuators[axisnumber].scroll.type);
        break;
    }
    info->increment =
        double_to_fp3232(dce->valuators[axisnumber].scroll.increment);
    info->sourceid = dce->sourceid;

    info->flags = 0;

    if (dce->valuators[axisnumber].scroll.flags & SCROLL_FLAG_DONT_EMULATE)
        info->flags |= XIScrollFlagNoEmulation;
    if (dce->valuators[axisnumber].scroll.flags & SCROLL_FLAG_PREFERRED)
        info->flags |= XIScrollFlagPreferred;

    return info->length * 4;
}

static int
eventToDeviceChanged(DeviceChangedEvent *dce, xEvent **xi)
{
    xXIDeviceChangedEvent *dcce;
    int len = sizeof(xXIDeviceChangedEvent);
    int nkeys;
    char *ptr;

    if (dce->buttons.num_buttons) {
        len += sizeof(xXIButtonInfo);
        len += dce->buttons.num_buttons * sizeof(Atom); /* button names */
        len += pad_to_int32(bits_to_bytes(dce->buttons.num_buttons));
    }
    if (dce->num_valuators) {
        int i;

        len += sizeof(xXIValuatorInfo) * dce->num_valuators;

        for (i = 0; i < dce->num_valuators; i++)
            if (dce->valuators[i].scroll.type != SCROLL_TYPE_NONE)
                len += sizeof(xXIScrollInfo);
    }

    nkeys = (dce->keys.max_keycode > 0) ?
        dce->keys.max_keycode - dce->keys.min_keycode + 1 : 0;
    if (nkeys > 0) {
        len += sizeof(xXIKeyInfo);
        len += sizeof(CARD32) * nkeys;  /* keycodes */
    }

    dcce = calloc(1, len);
    if (!dcce) {
        ErrorF("[Xi] BadAlloc in SendDeviceChangedEvent.\n");
        return BadAlloc;
    }

    dcce->type = GenericEvent;
    dcce->extension = IReqCode;
    dcce->evtype = XI_DeviceChanged;
    dcce->time = dce->time;
    dcce->deviceid = dce->deviceid;
    dcce->sourceid = dce->sourceid;
    dcce->reason =
        (dce->flags & DEVCHANGE_DEVICE_CHANGE) ? XIDeviceChange : XISlaveSwitch;
    dcce->num_classes = 0;
    dcce->length = bytes_to_int32(len - sizeof(xEvent));

    ptr = (char *) &dcce[1];
    if (dce->buttons.num_buttons) {
        dcce->num_classes++;
        ptr += appendButtonInfo(dce, (xXIButtonInfo *) ptr);
    }

    if (nkeys) {
        dcce->num_classes++;
        ptr += appendKeyInfo(dce, (xXIKeyInfo *) ptr);
    }

    if (dce->num_valuators) {
        int i;

        dcce->num_classes += dce->num_valuators;
        for (i = 0; i < dce->num_valuators; i++)
            ptr += appendValuatorInfo(dce, (xXIValuatorInfo *) ptr, i);

        for (i = 0; i < dce->num_valuators; i++) {
            if (dce->valuators[i].scroll.type != SCROLL_TYPE_NONE) {
                dcce->num_classes++;
                ptr += appendScrollInfo(dce, (xXIScrollInfo *) ptr, i);
            }
        }
    }

    *xi = (xEvent *) dcce;

    return Success;
}

static int
count_bits(unsigned char *ptr, int len)
{
    int bits = 0;
    unsigned int i;
    unsigned char x;

    for (i = 0; i < len; i++) {
        x = ptr[i];
        while (x > 0) {
            bits += (x & 0x1);
            x >>= 1;
        }
    }
    return bits;
}

static int
eventToDeviceEvent(DeviceEvent *ev, xEvent **xi)
{
    int len = sizeof(xXIDeviceEvent);
    xXIDeviceEvent *xde;
    int i, btlen, vallen;
    char *ptr;
    FP3232 *axisval;

    /* FIXME: this should just send the buttons we have, not MAX_BUTTONs. Same
     * with MAX_VALUATORS below */
    /* btlen is in 4 byte units */
    btlen = bytes_to_int32(bits_to_bytes(MAX_BUTTONS));
    len += btlen * 4;           /* buttonmask len */

    vallen =
        count_bits(ev->valuators.mask,
                   sizeof(ev->valuators.mask) / sizeof(ev->valuators.mask[0]));
    len += vallen * 2 * sizeof(uint32_t);       /* axisvalues */
    vallen = bytes_to_int32(bits_to_bytes(MAX_VALUATORS));
    len += vallen * 4;          /* valuators mask */

    *xi = calloc(1, len);
    xde = (xXIDeviceEvent *) * xi;
    xde->type = GenericEvent;
    xde->extension = IReqCode;
    xde->evtype = GetXI2Type(ev->type);
    xde->time = ev->time;
    xde->length = bytes_to_int32(len - sizeof(xEvent));
    if (IsTouchEvent((InternalEvent *) ev))
        xde->detail = ev->touchid;
    else
        xde->detail = ev->detail.button;

    xde->root = ev->root;
    xde->buttons_len = btlen;
    xde->valuators_len = vallen;
    xde->deviceid = ev->deviceid;
    xde->sourceid = ev->sourceid;
    xde->root_x = double_to_fp1616(ev->root_x + ev->root_x_frac);
    xde->root_y = double_to_fp1616(ev->root_y + ev->root_y_frac);

    if (IsTouchEvent((InternalEvent *)ev)) {
        if (ev->type == ET_TouchUpdate)
            xde->flags |= (ev->flags & TOUCH_PENDING_END) ? XITouchPendingEnd : 0;

        if (ev->flags & TOUCH_POINTER_EMULATED)
            xde->flags |= XITouchEmulatingPointer;
    } else {
        xde->flags = ev->flags;

        if (ev->key_repeat)
            xde->flags |= XIKeyRepeat;
    }

    xde->mods.base_mods = ev->mods.base;
    xde->mods.latched_mods = ev->mods.latched;
    xde->mods.locked_mods = ev->mods.locked;
    xde->mods.effective_mods = ev->mods.effective;

    xde->group.base_group = ev->group.base;
    xde->group.latched_group = ev->group.latched;
    xde->group.locked_group = ev->group.locked;
    xde->group.effective_group = ev->group.effective;

    ptr = (char *) &xde[1];
    for (i = 0; i < sizeof(ev->buttons) * 8; i++) {
        if (BitIsOn(ev->buttons, i))
            SetBit(ptr, i);
    }

    ptr += xde->buttons_len * 4;
    axisval = (FP3232 *) (ptr + xde->valuators_len * 4);
    for (i = 0; i < sizeof(ev->valuators.mask) * 8; i++) {
        if (BitIsOn(ev->valuators.mask, i)) {
            SetBit(ptr, i);
            *axisval = double_to_fp3232(ev->valuators.data[i]);
            axisval++;
        }
    }

    return Success;
}

static int
eventToTouchOwnershipEvent(TouchOwnershipEvent *ev, xEvent **xi)
{
    int len = sizeof(xXITouchOwnershipEvent);
    xXITouchOwnershipEvent *xtoe;

    *xi = calloc(1, len);
    xtoe = (xXITouchOwnershipEvent *) * xi;
    xtoe->type = GenericEvent;
    xtoe->extension = IReqCode;
    xtoe->length = bytes_to_int32(len - sizeof(xEvent));
    xtoe->evtype = GetXI2Type(ev->type);
    xtoe->deviceid = ev->deviceid;
    xtoe->time = ev->time;
    xtoe->sourceid = ev->sourceid;
    xtoe->touchid = ev->touchid;
    xtoe->flags = 0;            /* we don't have wire flags for ownership yet */

    return Success;
}

static int
eventToRawEvent(RawDeviceEvent *ev, xEvent **xi)
{
    xXIRawEvent *raw;
    int vallen, nvals;
    int i, len = sizeof(xXIRawEvent);
    char *ptr;
    FP3232 *axisval, *axisval_raw;

    nvals = count_bits(ev->valuators.mask, sizeof(ev->valuators.mask));
    len += nvals * sizeof(FP3232) * 2;  /* 8 byte per valuator, once
                                           raw, once processed */
    vallen = bytes_to_int32(bits_to_bytes(MAX_VALUATORS));
    len += vallen * 4;          /* valuators mask */

    *xi = calloc(1, len);
    raw = (xXIRawEvent *) * xi;
    raw->type = GenericEvent;
    raw->extension = IReqCode;
    raw->evtype = GetXI2Type(ev->type);
    raw->time = ev->time;
    raw->length = bytes_to_int32(len - sizeof(xEvent));
    raw->detail = ev->detail.button;
    raw->deviceid = ev->deviceid;
    raw->sourceid = ev->sourceid;
    raw->valuators_len = vallen;
    raw->flags = ev->flags;

    ptr = (char *) &raw[1];
    axisval = (FP3232 *) (ptr + raw->valuators_len * 4);
    axisval_raw = axisval + nvals;
    for (i = 0; i < sizeof(ev->valuators.mask) * 8; i++) {
        if (BitIsOn(ev->valuators.mask, i)) {
            SetBit(ptr, i);
            *axisval = double_to_fp3232(ev->valuators.data[i]);
            *axisval_raw = double_to_fp3232(ev->valuators.data_raw[i]);
            axisval++;
            axisval_raw++;
        }
    }

    return Success;
}

static int
eventToBarrierEvent(BarrierEvent *ev, xEvent **xi)
{
    xXIBarrierEvent *barrier;
    int len = sizeof(xXIBarrierEvent);

    *xi = calloc(1, len);
    barrier = (xXIBarrierEvent*) *xi;
    barrier->type = GenericEvent;
    barrier->extension = IReqCode;
    barrier->evtype = GetXI2Type(ev->type);
    barrier->length = bytes_to_int32(len - sizeof(xEvent));
    barrier->deviceid = ev->deviceid;
    barrier->sourceid = ev->sourceid;
    barrier->time = ev->time;
    barrier->event = ev->window;
    barrier->root = ev->root;
    barrier->dx = double_to_fp3232(ev->dx);
    barrier->dy = double_to_fp3232(ev->dy);
    barrier->dtime = ev->dt;
    barrier->flags = ev->flags;
    barrier->eventid = ev->event_id;
    barrier->barrier = ev->barrierid;
    barrier->root_x = double_to_fp1616(ev->root_x);
    barrier->root_y = double_to_fp1616(ev->root_y);

    return Success;
}

/**
 * Return the corresponding core type for the given event or 0 if no core
 * equivalent exists.
 */
int
GetCoreType(enum EventType type)
{
    int coretype = 0;

    switch (type) {
    case ET_Motion:
        coretype = MotionNotify;
        break;
    case ET_ButtonPress:
        coretype = ButtonPress;
        break;
    case ET_ButtonRelease:
        coretype = ButtonRelease;
        break;
    case ET_KeyPress:
        coretype = KeyPress;
        break;
    case ET_KeyRelease:
        coretype = KeyRelease;
        break;
    default:
        break;
    }
    return coretype;
}

/**
 * Return the corresponding XI 1.x type for the given event or 0 if no
 * equivalent exists.
 */
int
GetXIType(enum EventType type)
{
    int xitype = 0;

    switch (type) {
    case ET_Motion:
        xitype = DeviceMotionNotify;
        break;
    case ET_ButtonPress:
        xitype = DeviceButtonPress;
        break;
    case ET_ButtonRelease:
        xitype = DeviceButtonRelease;
        break;
    case ET_KeyPress:
        xitype = DeviceKeyPress;
        break;
    case ET_KeyRelease:
        xitype = DeviceKeyRelease;
        break;
    case ET_ProximityIn:
        xitype = ProximityIn;
        break;
    case ET_ProximityOut:
        xitype = ProximityOut;
        break;
    default:
        break;
    }
    return xitype;
}

/**
 * Return the corresponding XI 2.x type for the given event or 0 if no
 * equivalent exists.
 */
int
GetXI2Type(enum EventType type)
{
    int xi2type = 0;

    switch (type) {
    case ET_Motion:
        xi2type = XI_Motion;
        break;
    case ET_ButtonPress:
        xi2type = XI_ButtonPress;
        break;
    case ET_ButtonRelease:
        xi2type = XI_ButtonRelease;
        break;
    case ET_KeyPress:
        xi2type = XI_KeyPress;
        break;
    case ET_KeyRelease:
        xi2type = XI_KeyRelease;
        break;
    case ET_Enter:
        xi2type = XI_Enter;
        break;
    case ET_Leave:
        xi2type = XI_Leave;
        break;
    case ET_Hierarchy:
        xi2type = XI_HierarchyChanged;
        break;
    case ET_DeviceChanged:
        xi2type = XI_DeviceChanged;
        break;
    case ET_RawKeyPress:
        xi2type = XI_RawKeyPress;
        break;
    case ET_RawKeyRelease:
        xi2type = XI_RawKeyRelease;
        break;
    case ET_RawButtonPress:
        xi2type = XI_RawButtonPress;
        break;
    case ET_RawButtonRelease:
        xi2type = XI_RawButtonRelease;
        break;
    case ET_RawMotion:
        xi2type = XI_RawMotion;
        break;
    case ET_RawTouchBegin:
        xi2type = XI_RawTouchBegin;
        break;
    case ET_RawTouchUpdate:
        xi2type = XI_RawTouchUpdate;
        break;
    case ET_RawTouchEnd:
        xi2type = XI_RawTouchEnd;
        break;
    case ET_FocusIn:
        xi2type = XI_FocusIn;
        break;
    case ET_FocusOut:
        xi2type = XI_FocusOut;
        break;
    case ET_TouchBegin:
        xi2type = XI_TouchBegin;
        break;
    case ET_TouchEnd:
        xi2type = XI_TouchEnd;
        break;
    case ET_TouchUpdate:
        xi2type = XI_TouchUpdate;
        break;
    case ET_TouchOwnership:
        xi2type = XI_TouchOwnership;
        break;
    case ET_BarrierHit:
        xi2type = XI_BarrierHit;
        break;
    case ET_BarrierLeave:
        xi2type = XI_BarrierLeave;
        break;
    default:
        break;
    }
    return xi2type;
}