Xwayland DDX

Started out as an Xorg module to be used from Xorg drivers to let
Xorg run under a wayland server.  The idea was to be able to reuse the
2D acceleration from the Xorg driver.  Now with glamor being credible,
a better plan is to just make Xwayland its own DDX, similar to Xwin
and Xquartz.  This is a much better fit, as much of the code in the
original approach had to hack around Xorg doing Xorg things like take
over the VT, probe input devices and read config files.  Another big win
is that Xwayland dosn't need to be setuid root.

The Xwayland support for DRI3, Glamor and render nodes was done by
Axel Davy <axel.davy@ens.fr>, who also did a lot of work on the rebase
to the Xwayland DDX.

Contributions from:

  Christopher James Halse Rogers <christopher.halse.rogers@canonical.com>
  Corentin Chary <corentin.chary@gmail.com>
  Daniel Stone <daniel@fooishbar.org>
  Kristian Høgsberg <krh@bitplanet.net>
  Robert Bragg <robert@linux.intel.com>
  Scott Moreau <oreaus@gmail.com>
  Tiago Vignatti <tiago.vignatti@intel.com>
  Giovanni Campagna <gcampagn@redhat.com>
  Jonas Ådahl <jadahl@gmail.com>
  Ray Strode <rstrode@redhat.com>
  Trevor McCort <tjmccort@gmail.com>
  Rui Matos <tiagomatos@gmail.com>
  Axel Davy <axel.davy@ens.fr>
  Jasper St. Pierre <jstpierre@mecheye.net>

Signed-off-by: Kristian Høgsberg <krh@bitplanet.net>
Reviewed-by: Axel Davy <axel.davy@ens.fr>

1 files changed, 666 insertions, 0 deletions

diff --git a/hw/xwayland/xwayland-input.c b/hw/xwayland/xwayland-input.c
new file mode 100644
index 000000000..990cb82d8
--- /dev/null
+++ b/hw/xwayland/xwayland-input.c
@@ -0,0 +1,666 @@
+/*
+ * Copyright © 2014 Intel Corporation
+ * Copyright © 2008 Kristian Høgsberg
+ *
+ * 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 the
+ * copyright holders not be used in advertising or publicity
+ * pertaining to distribution of the software without specific,
+ * written prior permission.  The copyright holders make no
+ * representations about the suitability of this software for any
+ * purpose.  It is provided "as is" without express or implied
+ * warranty.
+ *
+ * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
+ * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS 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 "xwayland.h"
+
+#include <linux/input.h>
+
+#include <sys/mman.h>
+#include <xkbsrv.h>
+#include <xserver-properties.h>
+#include <inpututils.h>
+
+static void
+xwl_pointer_control(DeviceIntPtr device, PtrCtrl *ctrl)
+{
+    /* Nothing to do, dix handles all settings */
+}
+
+static int
+xwl_pointer_proc(DeviceIntPtr device, int what)
+{
+#define NBUTTONS 10
+#define NAXES 2
+    BYTE map[NBUTTONS + 1];
+    int i = 0;
+    Atom btn_labels[NBUTTONS] = { 0 };
+    Atom axes_labels[NAXES] = { 0 };
+
+    switch (what) {
+    case DEVICE_INIT:
+        device->public.on = FALSE;
+
+        for (i = 1; i <= NBUTTONS; i++)
+            map[i] = i;
+
+        btn_labels[0] = XIGetKnownProperty(BTN_LABEL_PROP_BTN_LEFT);
+        btn_labels[1] = XIGetKnownProperty(BTN_LABEL_PROP_BTN_MIDDLE);
+        btn_labels[2] = XIGetKnownProperty(BTN_LABEL_PROP_BTN_RIGHT);
+        btn_labels[3] = XIGetKnownProperty(BTN_LABEL_PROP_BTN_WHEEL_UP);
+        btn_labels[4] = XIGetKnownProperty(BTN_LABEL_PROP_BTN_WHEEL_DOWN);
+        btn_labels[5] = XIGetKnownProperty(BTN_LABEL_PROP_BTN_HWHEEL_LEFT);
+        btn_labels[6] = XIGetKnownProperty(BTN_LABEL_PROP_BTN_HWHEEL_RIGHT);
+        /* don't know about the rest */
+
+        axes_labels[0] = XIGetKnownProperty(AXIS_LABEL_PROP_ABS_X);
+        axes_labels[1] = XIGetKnownProperty(AXIS_LABEL_PROP_ABS_Y);
+
+        if (!InitValuatorClassDeviceStruct(device, 2, btn_labels,
+                                           GetMotionHistorySize(), Absolute))
+            return BadValue;
+
+        /* Valuators */
+        InitValuatorAxisStruct(device, 0, axes_labels[0],
+                               0, 0xFFFF, 10000, 0, 10000, Absolute);
+        InitValuatorAxisStruct(device, 1, axes_labels[1],
+                               0, 0xFFFF, 10000, 0, 10000, Absolute);
+
+        if (!InitPtrFeedbackClassDeviceStruct(device, xwl_pointer_control))
+            return BadValue;
+
+        if (!InitButtonClassDeviceStruct(device, 3, btn_labels, map))
+            return BadValue;
+
+        return Success;
+
+    case DEVICE_ON:
+        device->public.on = TRUE;
+        return Success;
+
+    case DEVICE_OFF:
+    case DEVICE_CLOSE:
+        device->public.on = FALSE;
+        return Success;
+    }
+
+    return BadMatch;
+
+#undef NBUTTONS
+#undef NAXES
+}
+
+static void
+xwl_keyboard_control(DeviceIntPtr device, KeybdCtrl *ctrl)
+{
+}
+
+static int
+xwl_keyboard_proc(DeviceIntPtr device, int what)
+{
+    struct xwl_seat *xwl_seat = device->public.devicePrivate;
+    int len;
+
+    switch (what) {
+    case DEVICE_INIT:
+        device->public.on = FALSE;
+        if (xwl_seat->keymap)
+            len = strnlen(xwl_seat->keymap, xwl_seat->keymap_size);
+        else
+            len = 0;
+        if (!InitKeyboardDeviceStructFromString(device, xwl_seat->keymap,
+                                                len,
+                                                NULL, xwl_keyboard_control))
+            return BadValue;
+
+        return Success;
+    case DEVICE_ON:
+        device->public.on = TRUE;
+        return Success;
+
+    case DEVICE_OFF:
+    case DEVICE_CLOSE:
+        device->public.on = FALSE;
+        return Success;
+    }
+
+    return BadMatch;
+}
+
+static void
+pointer_handle_enter(void *data, struct wl_pointer *pointer,
+                     uint32_t serial, struct wl_surface *surface,
+                     wl_fixed_t sx_w, wl_fixed_t sy_w)
+{
+    struct xwl_seat *xwl_seat = data;
+    DeviceIntPtr dev = xwl_seat->pointer;
+    int i;
+    int sx = wl_fixed_to_int(sx_w);
+    int sy = wl_fixed_to_int(sy_w);
+    ScreenPtr pScreen = xwl_seat->xwl_screen->screen;
+    ValuatorMask mask;
+
+    xwl_seat->xwl_screen->serial = serial;
+    xwl_seat->pointer_enter_serial = serial;
+
+    xwl_seat->focus_window = wl_surface_get_user_data(surface);
+
+    (*pScreen->SetCursorPosition) (dev, pScreen, sx, sy, TRUE);
+    CheckMotion(NULL, GetMaster(dev, MASTER_POINTER));
+
+    /* Ideally, X clients shouldn't see these button releases.  When
+     * the pointer leaves a window with buttons down, it means that
+     * the wayland compositor has grabbed the pointer.  The button
+     * release event is consumed by whatever grab in the compositor
+     * and won't be sent to clients (the X server is a client).
+     * However, we need to reset X's idea of which buttons are up and
+     * down, and they're all up (by definition) when the pointer
+     * enters a window.  We should figure out a way to swallow these
+     * events, perhaps using an X grab whenever the pointer is not in
+     * any X window, but for now just send the events. */
+    valuator_mask_zero(&mask);
+    for (i = 0; i < dev->button->numButtons; i++)
+        if (BitIsOn(dev->button->down, i))
+            QueuePointerEvents(xwl_seat->pointer, ButtonRelease, i, 0, &mask);
+}
+
+static void
+pointer_handle_leave(void *data, struct wl_pointer *pointer,
+                     uint32_t serial, struct wl_surface *surface)
+{
+    struct xwl_seat *xwl_seat = data;
+    DeviceIntPtr dev = xwl_seat->pointer;
+
+    xwl_seat->xwl_screen->serial = serial;
+
+    xwl_seat->focus_window = NULL;
+    CheckMotion(NULL, GetMaster(dev, MASTER_POINTER));
+}
+
+static void
+pointer_handle_motion(void *data, struct wl_pointer *pointer,
+                      uint32_t time, wl_fixed_t sx_w, wl_fixed_t sy_w)
+{
+    struct xwl_seat *xwl_seat = data;
+    int32_t dx, dy;
+    int sx = wl_fixed_to_int(sx_w);
+    int sy = wl_fixed_to_int(sy_w);
+    ValuatorMask mask;
+
+    if (!xwl_seat->focus_window)
+        return;
+
+    dx = xwl_seat->focus_window->window->drawable.x;
+    dy = xwl_seat->focus_window->window->drawable.y;
+
+    valuator_mask_zero(&mask);
+    valuator_mask_set(&mask, 0, dx + sx);
+    valuator_mask_set(&mask, 1, dy + sy);
+
+    QueuePointerEvents(xwl_seat->pointer, MotionNotify, 0,
+                       POINTER_ABSOLUTE | POINTER_SCREEN, &mask);
+}
+
+static void
+pointer_handle_button(void *data, struct wl_pointer *pointer, uint32_t serial,
+                      uint32_t time, uint32_t button, uint32_t state)
+{
+    struct xwl_seat *xwl_seat = data;
+    int index;
+    ValuatorMask mask;
+
+    xwl_seat->xwl_screen->serial = serial;
+
+    switch (button) {
+    case BTN_MIDDLE:
+        index = 2;
+        break;
+    case BTN_RIGHT:
+        index = 3;
+        break;
+    default:
+        index = button - BTN_LEFT + 1;
+        break;
+    }
+
+    valuator_mask_zero(&mask);
+    QueuePointerEvents(xwl_seat->pointer,
+                       state ? ButtonPress : ButtonRelease, index, 0, &mask);
+}
+
+static void
+pointer_handle_axis(void *data, struct wl_pointer *pointer,
+                    uint32_t time, uint32_t axis, wl_fixed_t value)
+{
+    struct xwl_seat *xwl_seat = data;
+    int index, count;
+    int i, val;
+    const int divisor = 10;
+    ValuatorMask mask;
+
+    if (time - xwl_seat->scroll_time > 2000) {
+        xwl_seat->vertical_scroll = 0;
+        xwl_seat->horizontal_scroll = 0;
+    }
+    xwl_seat->scroll_time = time;
+
+    /* FIXME: Need to do proper smooth scrolling here! */
+    switch (axis) {
+    case WL_POINTER_AXIS_VERTICAL_SCROLL:
+        xwl_seat->vertical_scroll += value / divisor;
+        val = wl_fixed_to_int(xwl_seat->vertical_scroll);
+        xwl_seat->vertical_scroll -= wl_fixed_from_int(val);
+
+        if (val <= -1)
+            index = 4;
+        else if (val >= 1)
+            index = 5;
+        else
+            return;
+        break;
+    case WL_POINTER_AXIS_HORIZONTAL_SCROLL:
+        xwl_seat->horizontal_scroll += value / divisor;
+        val = wl_fixed_to_int(xwl_seat->horizontal_scroll);
+        xwl_seat->horizontal_scroll -= wl_fixed_from_int(val);
+
+        if (val <= -1)
+            index = 6;
+        else if (val >= 1)
+            index = 7;
+        else
+            return;
+        break;
+    default:
+        return;
+    }
+
+    valuator_mask_zero(&mask);
+
+    count = abs(val);
+    for (i = 0; i < count; i++) {
+        QueuePointerEvents(xwl_seat->pointer, ButtonPress, index, 0, &mask);
+        QueuePointerEvents(xwl_seat->pointer, ButtonRelease, index, 0, &mask);
+    }
+}
+
+static const struct wl_pointer_listener pointer_listener = {
+    pointer_handle_enter,
+    pointer_handle_leave,
+    pointer_handle_motion,
+    pointer_handle_button,
+    pointer_handle_axis,
+};
+
+static void
+keyboard_handle_key(void *data, struct wl_keyboard *keyboard, uint32_t serial,
+                    uint32_t time, uint32_t key, uint32_t state)
+{
+    struct xwl_seat *xwl_seat = data;
+    uint32_t *k, *end;
+    ValuatorMask mask;
+
+    xwl_seat->xwl_screen->serial = serial;
+
+    end = (uint32_t *) ((char *) xwl_seat->keys.data + xwl_seat->keys.size);
+    for (k = xwl_seat->keys.data; k < end; k++) {
+        if (*k == key)
+            *k = *--end;
+    }
+    xwl_seat->keys.size = (char *) end - (char *) xwl_seat->keys.data;
+    if (state) {
+        k = wl_array_add(&xwl_seat->keys, sizeof *k);
+        *k = key;
+    }
+
+    valuator_mask_zero(&mask);
+    QueueKeyboardEvents(xwl_seat->keyboard,
+                        state ? KeyPress : KeyRelease, key + 8, &mask);
+}
+
+static void
+keyboard_handle_keymap(void *data, struct wl_keyboard *keyboard,
+                       uint32_t format, int fd, uint32_t size)
+{
+    struct xwl_seat *xwl_seat = data;
+    DeviceIntPtr master;
+    XkbDescPtr xkb;
+    XkbChangesRec changes = { 0 };
+
+    if (xwl_seat->keymap)
+        munmap(xwl_seat->keymap, xwl_seat->keymap_size);
+
+    xwl_seat->keymap_size = size;
+    xwl_seat->keymap = mmap(NULL, size, PROT_READ, MAP_SHARED, fd, 0);
+    if (xwl_seat->keymap == MAP_FAILED) {
+        xwl_seat->keymap_size = 0;
+        xwl_seat->keymap = NULL;
+        goto out;
+    }
+
+    xkb = XkbCompileKeymapFromString(xwl_seat->keyboard, xwl_seat->keymap,
+                                     strnlen(xwl_seat->keymap,
+                                             xwl_seat->keymap_size));
+    if (!xkb)
+        goto out;
+
+    XkbUpdateDescActions(xkb, xkb->min_key_code, XkbNumKeys(xkb), &changes);
+
+    if (xwl_seat->keyboard->key)
+        /* Keep the current controls */
+        XkbCopyControls(xkb, xwl_seat->keyboard->key->xkbInfo->desc);
+
+    XkbDeviceApplyKeymap(xwl_seat->keyboard, xkb);
+
+    master = GetMaster(xwl_seat->keyboard, MASTER_KEYBOARD);
+    if (master && master->lastSlave == xwl_seat->keyboard)
+        XkbDeviceApplyKeymap(master, xkb);
+
+    XkbFreeKeyboard(xkb, XkbAllComponentsMask, TRUE);
+
+ out:
+    close(fd);
+}
+
+static void
+keyboard_handle_enter(void *data, struct wl_keyboard *keyboard,
+                      uint32_t serial,
+                      struct wl_surface *surface, struct wl_array *keys)
+{
+    struct xwl_seat *xwl_seat = data;
+    ValuatorMask mask;
+    uint32_t *k;
+
+    xwl_seat->xwl_screen->serial = serial;
+    xwl_seat->keyboard_focus = surface;
+
+    wl_array_copy(&xwl_seat->keys, keys);
+    valuator_mask_zero(&mask);
+    wl_array_for_each(k, &xwl_seat->keys)
+        QueueKeyboardEvents(xwl_seat->keyboard, KeyPress, *k + 8, &mask);
+}
+
+static void
+keyboard_handle_leave(void *data, struct wl_keyboard *keyboard,
+                      uint32_t serial, struct wl_surface *surface)
+{
+    struct xwl_seat *xwl_seat = data;
+    ValuatorMask mask;
+    uint32_t *k;
+
+    xwl_seat->xwl_screen->serial = serial;
+
+    valuator_mask_zero(&mask);
+    wl_array_for_each(k, &xwl_seat->keys)
+        QueueKeyboardEvents(xwl_seat->keyboard, KeyRelease, *k + 8, &mask);
+
+    xwl_seat->keyboard_focus = NULL;
+}
+
+static void
+keyboard_handle_modifiers(void *data, struct wl_keyboard *keyboard,
+                          uint32_t serial, uint32_t mods_depressed,
+                          uint32_t mods_latched, uint32_t mods_locked,
+                          uint32_t group)
+{
+    struct xwl_seat *xwl_seat = data;
+    DeviceIntPtr dev;
+    XkbStateRec old_state, *new_state;
+    xkbStateNotify sn;
+    CARD16 changed;
+
+    /* We don't need any of this while we have keyboard focus since
+       the regular key event processing already takes care of setting
+       our internal state correctly. */
+    if (xwl_seat->keyboard_focus)
+        return;
+
+    for (dev = inputInfo.devices; dev; dev = dev->next) {
+        if (dev != xwl_seat->keyboard &&
+            dev != GetMaster(xwl_seat->keyboard, MASTER_KEYBOARD))
+            continue;
+
+        old_state = dev->key->xkbInfo->state;
+        new_state = &dev->key->xkbInfo->state;
+
+        new_state->locked_group = group & XkbAllGroupsMask;
+        new_state->locked_mods = mods_locked & XkbAllModifiersMask;
+        XkbLatchModifiers(dev, XkbAllModifiersMask,
+                          mods_latched & XkbAllModifiersMask);
+
+        XkbComputeDerivedState(dev->key->xkbInfo);
+
+        changed = XkbStateChangedFlags(&old_state, new_state);
+        if (!changed)
+            continue;
+
+        sn.keycode = 0;
+        sn.eventType = 0;
+        sn.requestMajor = XkbReqCode;
+        sn.requestMinor = X_kbLatchLockState;   /* close enough */
+        sn.changed = changed;
+        XkbSendStateNotify(dev, &sn);
+    }
+}
+
+static const struct wl_keyboard_listener keyboard_listener = {
+    keyboard_handle_keymap,
+    keyboard_handle_enter,
+    keyboard_handle_leave,
+    keyboard_handle_key,
+    keyboard_handle_modifiers,
+};
+
+static DeviceIntPtr
+add_device(struct xwl_seat *xwl_seat,
+           const char *driver, DeviceProc device_proc)
+{
+    DeviceIntPtr dev = NULL;
+    static Atom type_atom;
+    char name[32];
+
+    dev = AddInputDevice(serverClient, device_proc, TRUE);
+    if (dev == NULL)
+        return NULL;
+
+    if (type_atom == None)
+        type_atom = MakeAtom(driver, strlen(driver), TRUE);
+    snprintf(name, sizeof name, "%s:%d", driver, xwl_seat->id);
+    AssignTypeAndName(dev, type_atom, name);
+    dev->public.devicePrivate = xwl_seat;
+    dev->type = SLAVE;
+    dev->spriteInfo->spriteOwner = FALSE;
+
+    return dev;
+}
+
+static void
+seat_handle_capabilities(void *data, struct wl_seat *seat,
+                         enum wl_seat_capability caps)
+{
+    struct xwl_seat *xwl_seat = data;
+
+    if (caps & WL_SEAT_CAPABILITY_POINTER && xwl_seat->pointer == NULL) {
+        xwl_seat->wl_pointer = wl_seat_get_pointer(seat);
+        wl_pointer_add_listener(xwl_seat->wl_pointer,
+                                &pointer_listener, xwl_seat);
+        xwl_seat_set_cursor(xwl_seat);
+        xwl_seat->pointer =
+            add_device(xwl_seat, "xwayland-pointer", xwl_pointer_proc);
+    }
+    else if (!(caps & WL_SEAT_CAPABILITY_POINTER) && xwl_seat->pointer) {
+        wl_pointer_release(xwl_seat->wl_pointer);
+        RemoveDevice(xwl_seat->pointer, FALSE);
+        xwl_seat->pointer = NULL;
+    }
+
+    if (caps & WL_SEAT_CAPABILITY_KEYBOARD && xwl_seat->keyboard == NULL) {
+        xwl_seat->wl_keyboard = wl_seat_get_keyboard(seat);
+        wl_keyboard_add_listener(xwl_seat->wl_keyboard,
+                                 &keyboard_listener, xwl_seat);
+        xwl_seat->keyboard =
+            add_device(xwl_seat, "xwayland-keyboard", xwl_keyboard_proc);
+    }
+    else if (!(caps & WL_SEAT_CAPABILITY_KEYBOARD) && xwl_seat->keyboard) {
+        wl_keyboard_release(xwl_seat->wl_keyboard);
+        RemoveDevice(xwl_seat->keyboard, FALSE);
+        xwl_seat->keyboard = NULL;
+    }
+
+    xwl_seat->xwl_screen->expecting_event--;
+    /* FIXME: Touch ... */
+}
+
+static void
+seat_handle_name(void *data, struct wl_seat *seat,
+		 const char *name)
+{
+
+}
+
+static const struct wl_seat_listener seat_listener = {
+    seat_handle_capabilities,
+    seat_handle_name
+};
+
+static void
+create_input_device(struct xwl_screen *xwl_screen, uint32_t id)
+{
+    struct xwl_seat *xwl_seat;
+
+    xwl_seat = calloc(sizeof *xwl_seat, 1);
+    if (xwl_seat == NULL) {
+        ErrorF("create_input ENOMEM");
+        return;
+    }
+
+    xwl_seat->xwl_screen = xwl_screen;
+    xorg_list_add(&xwl_seat->link, &xwl_screen->seat_list);
+
+    xwl_seat->seat =
+        wl_registry_bind(xwl_screen->registry, id, &wl_seat_interface, 3);
+    xwl_seat->id = id;
+
+    xwl_seat->cursor = wl_compositor_create_surface(xwl_screen->compositor);
+    wl_seat_add_listener(xwl_seat->seat, &seat_listener, xwl_seat);
+    wl_array_init(&xwl_seat->keys);
+}
+
+void
+xwl_seat_destroy(struct xwl_seat *xwl_seat)
+{
+    RemoveDevice(xwl_seat->pointer, FALSE);
+    RemoveDevice(xwl_seat->keyboard, FALSE);
+    wl_seat_destroy(xwl_seat->seat);
+    wl_surface_destroy(xwl_seat->cursor);
+    wl_array_release(&xwl_seat->keys);
+    free(xwl_seat);
+}
+
+static void
+input_handler(void *data, struct wl_registry *registry, uint32_t id,
+              const char *interface, uint32_t version)
+{
+    struct xwl_screen *xwl_screen = data;
+
+    if (strcmp(interface, "wl_seat") == 0 && version >= 3) {
+        create_input_device(xwl_screen, id);
+        xwl_screen->expecting_event++;
+    }
+}
+
+static void
+global_remove(void *data, struct wl_registry *registry, uint32_t name)
+{
+}
+
+static const struct wl_registry_listener input_listener = {
+    input_handler,
+    global_remove,
+};
+
+Bool
+LegalModifier(unsigned int key, DeviceIntPtr pDev)
+{
+    return TRUE;
+}
+
+void
+ProcessInputEvents(void)
+{
+    mieqProcessInputEvents();
+}
+
+void
+DDXRingBell(int volume, int pitch, int duration)
+{
+}
+
+static WindowPtr
+xwl_xy_to_window(ScreenPtr screen, SpritePtr sprite, int x, int y)
+{
+    struct xwl_seat *xwl_seat = NULL;
+    DeviceIntPtr device;
+
+    for (device = inputInfo.devices; device; device = device->next) {
+        if (device->deviceProc == xwl_pointer_proc &&
+            device->spriteInfo->sprite == sprite) {
+            xwl_seat = device->public.devicePrivate;
+            break;
+        }
+    }
+
+    if (xwl_seat == NULL) {
+        /* XTEST device */
+        sprite->spriteTraceGood = 1;
+        return sprite->spriteTrace[0];
+    }
+
+    if (xwl_seat->focus_window) {
+        sprite->spriteTraceGood = 2;
+        sprite->spriteTrace[1] = xwl_seat->focus_window->window;
+        return miSpriteTrace(sprite, x, y);
+    }
+    else {
+        sprite->spriteTraceGood = 1;
+        return sprite->spriteTrace[0];
+    }
+}
+
+void
+InitInput(int argc, char *argv[])
+{
+    ScreenPtr pScreen = screenInfo.screens[0];
+    struct xwl_screen *xwl_screen = xwl_screen_get(pScreen);
+
+    mieqInit();
+
+    xwl_screen->input_registry = wl_display_get_registry(xwl_screen->display);
+    wl_registry_add_listener(xwl_screen->input_registry, &input_listener,
+                             xwl_screen);
+
+    xwl_screen->XYToWindow = pScreen->XYToWindow;
+    pScreen->XYToWindow = xwl_xy_to_window;
+
+    xwl_screen->expecting_event = 0;
+    wl_display_roundtrip(xwl_screen->display);
+    while (xwl_screen->expecting_event)
+        wl_display_roundtrip(xwl_screen->display);
+}
+
+void
+CloseInput(void)
+{
+    mieqFini();
+}