mutter/src/wayland/meta-wayland.c

/*
 * Wayland Support
 *
 * Copyright (C) 2012,2013 Intel Corporation
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 * 02111-1307, USA.
 */

#include <config.h>

#include <clutter/clutter.h>
#include <clutter/wayland/clutter-wayland-compositor.h>
#include <clutter/wayland/clutter-wayland-surface.h>

#include <glib.h>
#include <sys/time.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <stdlib.h>
#include <sys/wait.h>

#include <wayland-server.h>

#include "meta-wayland-private.h"
#include "meta-xwayland-private.h"
#include "meta-wayland-stage.h"
#include "meta-window-actor-private.h"
#include "meta-wayland-seat.h"
#include "meta-wayland-keyboard.h"
#include "meta-wayland-pointer.h"
#include "meta-wayland-data-device.h"
#include "meta-cursor-tracker-private.h"
#include "display-private.h"
#include "window-private.h"
#include <meta/types.h>
#include <meta/main.h>
#include "frame.h"

static MetaWaylandCompositor _meta_wayland_compositor;

MetaWaylandCompositor *
meta_wayland_compositor_get_default (void)
{
  return &_meta_wayland_compositor;
}

static guint32
get_time (void)
{
  struct timeval tv;
  gettimeofday (&tv, NULL);
  return tv.tv_sec * 1000 + tv.tv_usec / 1000;
}

static gboolean
wayland_event_source_prepare (GSource *base, int *timeout)
{
  WaylandEventSource *source = (WaylandEventSource *)base;

  *timeout = -1;

  wl_display_flush_clients (source->display);

  return FALSE;
}

static gboolean
wayland_event_source_check (GSource *base)
{
  WaylandEventSource *source = (WaylandEventSource *)base;
  return source->pfd.revents;
}

static gboolean
wayland_event_source_dispatch (GSource *base,
                               GSourceFunc callback,
                               void *data)
{
  WaylandEventSource *source = (WaylandEventSource *)base;
  struct wl_event_loop *loop = wl_display_get_event_loop (source->display);

  wl_event_loop_dispatch (loop, 0);

  return TRUE;
}

static GSourceFuncs wayland_event_source_funcs =
{
  wayland_event_source_prepare,
  wayland_event_source_check,
  wayland_event_source_dispatch,
  NULL
};

static GSource *
wayland_event_source_new (struct wl_display *display)
{
  WaylandEventSource *source;
  struct wl_event_loop *loop = wl_display_get_event_loop (display);

  source = (WaylandEventSource *) g_source_new (&wayland_event_source_funcs,
                                                sizeof (WaylandEventSource));
  source->display = display;
  source->pfd.fd = wl_event_loop_get_fd (loop);
  source->pfd.events = G_IO_IN | G_IO_ERR;
  g_source_add_poll (&source->source, &source->pfd);

  return &source->source;
}

static void
meta_wayland_buffer_destroy_handler (struct wl_listener *listener,
                                     void *data)
{
  MetaWaylandBuffer *buffer =
    wl_container_of (listener, buffer, destroy_listener);

  wl_signal_emit (&buffer->destroy_signal, buffer);
  g_slice_free (MetaWaylandBuffer, buffer);
}

static MetaWaylandBuffer *
meta_wayland_buffer_from_resource (struct wl_resource *resource)
{
  MetaWaylandBuffer *buffer;
  struct wl_listener *listener;

  listener =
    wl_resource_get_destroy_listener (resource,
                                      meta_wayland_buffer_destroy_handler);

  if (listener)
    {
      buffer = wl_container_of (listener, buffer, destroy_listener);
    }
  else
    {
      buffer = g_slice_new0 (MetaWaylandBuffer);

      buffer->resource = resource;
      wl_signal_init (&buffer->destroy_signal);
      buffer->destroy_listener.notify = meta_wayland_buffer_destroy_handler;
      wl_resource_add_destroy_listener (resource, &buffer->destroy_listener);
    }

  return buffer;
}

static void
meta_wayland_buffer_reference_handle_destroy (struct wl_listener *listener,
                                          void *data)
{
  MetaWaylandBufferReference *ref =
    wl_container_of (listener, ref, destroy_listener);

  g_assert (data == ref->buffer);

  ref->buffer = NULL;
}

static void
meta_wayland_buffer_reference (MetaWaylandBufferReference *ref,
                               MetaWaylandBuffer *buffer)
{
  if (ref->buffer && buffer != ref->buffer)
    {
      ref->buffer->busy_count--;

      if (ref->buffer->busy_count == 0)
        {
          g_assert (wl_resource_get_client (ref->buffer->resource));
          wl_resource_queue_event (ref->buffer->resource, WL_BUFFER_RELEASE);
        }

      wl_list_remove (&ref->destroy_listener.link);
    }

  if (buffer && buffer != ref->buffer)
    {
      buffer->busy_count++;
      wl_signal_add (&buffer->destroy_signal, &ref->destroy_listener);
    }

  ref->buffer = buffer;
  ref->destroy_listener.notify = meta_wayland_buffer_reference_handle_destroy;
}

static void
surface_process_damage (MetaWaylandSurface *surface,
                        cairo_region_t *region)
{
  if (surface->window &&
      surface->buffer_ref.buffer)
    {
      MetaWindowActor *window_actor =
        META_WINDOW_ACTOR (meta_window_get_compositor_private (surface->window));

      if (window_actor)
        {
          int i, n_rectangles = cairo_region_num_rectangles (region);

          for (i = 0; i < n_rectangles; i++)
            {
              cairo_rectangle_int_t rectangle;

              cairo_region_get_rectangle (region, i, &rectangle);

              meta_window_actor_process_wayland_damage (window_actor,
                                                        rectangle.x,
                                                        rectangle.y,
                                                        rectangle.width,
                                                        rectangle.height);
            }
        }
    }
}

static void
meta_wayland_surface_destroy (struct wl_client *wayland_client,
                              struct wl_resource *wayland_resource)
{
  wl_resource_destroy (wayland_resource);
}

static void
meta_wayland_surface_attach (struct wl_client *wayland_client,
                             struct wl_resource *wayland_surface_resource,
                             struct wl_resource *wayland_buffer_resource,
                             gint32 sx, gint32 sy)
{
  MetaWaylandSurface *surface =
    wl_resource_get_user_data (wayland_surface_resource);
  MetaWaylandBuffer *buffer;

  /* X11 unmanaged window */
  if (!surface)
    return;

  if (wayland_buffer_resource)
    buffer = meta_wayland_buffer_from_resource (wayland_buffer_resource);
  else
    buffer = NULL;

  /* Attach without commit in between does not send wl_buffer.release */
  if (surface->pending.buffer)
    wl_list_remove (&surface->pending.buffer_destroy_listener.link);

  surface->pending.sx = sx;
  surface->pending.sy = sy;
  surface->pending.buffer = buffer;
  surface->pending.newly_attached = TRUE;

  if (buffer)
    wl_signal_add (&buffer->destroy_signal,
                   &surface->pending.buffer_destroy_listener);
}

static void
meta_wayland_surface_damage (struct wl_client *client,
                             struct wl_resource *surface_resource,
                             gint32 x,
                             gint32 y,
                             gint32 width,
                             gint32 height)
{
  MetaWaylandSurface *surface = wl_resource_get_user_data (surface_resource);
  cairo_rectangle_int_t rectangle = { x, y, width, height };

  /* X11 unmanaged window */
  if (!surface)
    return;

  cairo_region_union_rectangle (surface->pending.damage, &rectangle);
}

static void
destroy_frame_callback (struct wl_resource *callback_resource)
{
  MetaWaylandFrameCallback *callback =
    wl_resource_get_user_data (callback_resource);

  wl_list_remove (&callback->link);
  g_slice_free (MetaWaylandFrameCallback, callback);
}

static void
meta_wayland_surface_frame (struct wl_client *client,
                            struct wl_resource *surface_resource,
                            guint32 callback_id)
{
  MetaWaylandFrameCallback *callback;
  MetaWaylandSurface *surface = wl_resource_get_user_data (surface_resource);

  /* X11 unmanaged window */
  if (!surface)
    return;

  callback = g_slice_new0 (MetaWaylandFrameCallback);
  callback->compositor = surface->compositor;
  callback->resource = wl_resource_create (client,
					   &wl_callback_interface, 1,
					   callback_id);
  wl_resource_set_user_data (callback->resource, callback);
  wl_resource_set_destructor (callback->resource, destroy_frame_callback);

  wl_list_insert (surface->pending.frame_callback_list.prev, &callback->link);
}

static void
meta_wayland_surface_set_opaque_region (struct wl_client *client,
                                        struct wl_resource *resource,
                                        struct wl_resource *region)
{
  g_warning ("TODO: support set_opaque_region request");
}

static void
meta_wayland_surface_set_input_region (struct wl_client *client,
                                       struct wl_resource *resource,
                                       struct wl_resource *region)
{
  g_warning ("TODO: support set_input_region request");
}

static void
empty_region (cairo_region_t *region)
{
  cairo_rectangle_int_t rectangle = { 0, 0, 0, 0 };
  cairo_region_intersect_rectangle (region, &rectangle);
}

static void
meta_wayland_surface_commit (struct wl_client *client,
                             struct wl_resource *resource)
{
  MetaWaylandSurface *surface = wl_resource_get_user_data (resource);
  MetaWaylandCompositor *compositor;

  /* X11 unmanaged window */
  if (!surface)
    return;

  compositor = surface->compositor;

  /* wl_surface.attach */
  if (surface->pending.newly_attached &&
      surface->buffer_ref.buffer != surface->pending.buffer)
    {
      /* Note: we set this before informing any window-actor since the
       * window actor will expect to find the new buffer within the
       * surface. */
      meta_wayland_buffer_reference (&surface->buffer_ref,
                                     surface->pending.buffer);

      if (surface->pending.buffer)
        {
          MetaWaylandBuffer *buffer = surface->pending.buffer;

          if (surface->window)
            {
              MetaWindow *window = surface->window;
              MetaWindowActor *window_actor =
                META_WINDOW_ACTOR (meta_window_get_compositor_private (window));
              MetaRectangle rect;

              meta_window_get_input_rect (surface->window, &rect);

              if (window_actor)
                meta_window_actor_attach_wayland_buffer (window_actor, buffer);

              /* XXX: we resize X based surfaces according to X events */
              if (surface->xid == 0 &&
                  (buffer->width != rect.width || buffer->height != rect.height))
                meta_window_resize (surface->window, FALSE, buffer->width, buffer->height);
            }
          else if (surface == compositor->seat->sprite)
            meta_wayland_seat_update_sprite (compositor->seat);
        }
    }

  if (surface->pending.buffer)
    {
      wl_list_remove (&surface->pending.buffer_destroy_listener.link);
      surface->pending.buffer = NULL;
    }
  surface->pending.sx = 0;
  surface->pending.sy = 0;
  surface->pending.newly_attached = FALSE;

  surface_process_damage (surface, surface->pending.damage);
  empty_region (surface->pending.damage);

  /* wl_surface.frame */
  wl_list_insert_list (&compositor->frame_callbacks,
                       &surface->pending.frame_callback_list);
  wl_list_init (&surface->pending.frame_callback_list);
}

static void
meta_wayland_surface_set_buffer_transform (struct wl_client *client,
                                           struct wl_resource *resource,
                                           int32_t transform)
{
  g_warning ("TODO: support set_buffer_transform request");
}

static void
meta_wayland_surface_set_buffer_scale (struct wl_client *client,
                                       struct wl_resource *resource,
                                       int scale)
{
  g_warning ("TODO: support set_buffer_scale request");
}

const struct wl_surface_interface meta_wayland_surface_interface = {
  meta_wayland_surface_destroy,
  meta_wayland_surface_attach,
  meta_wayland_surface_damage,
  meta_wayland_surface_frame,
  meta_wayland_surface_set_opaque_region,
  meta_wayland_surface_set_input_region,
  meta_wayland_surface_commit,
  meta_wayland_surface_set_buffer_transform,
  meta_wayland_surface_set_buffer_scale
};

void
meta_wayland_compositor_set_input_focus (MetaWaylandCompositor *compositor,
                                         MetaWindow            *window)
{
  MetaWaylandSurface *surface = window ? window->surface : NULL;

  meta_wayland_keyboard_set_focus (&compositor->seat->keyboard,
                                   surface);
  meta_wayland_data_device_set_keyboard_focus (compositor->seat);
}

void
meta_wayland_compositor_repick (MetaWaylandCompositor *compositor)
{
  meta_wayland_seat_repick (compositor->seat,
                            get_time (),
                            NULL);
}

void
meta_wayland_surface_free (MetaWaylandSurface *surface)
{
  MetaWaylandCompositor *compositor = surface->compositor;
  MetaWaylandFrameCallback *cb, *next;

  compositor->surfaces = g_list_remove (compositor->surfaces, surface);

  meta_wayland_buffer_reference (&surface->buffer_ref, NULL);

  if (surface->pending.buffer)
    wl_list_remove (&surface->pending.buffer_destroy_listener.link);

  cairo_region_destroy (surface->pending.damage);

  wl_list_for_each_safe (cb, next,
                         &surface->pending.frame_callback_list, link)
    wl_resource_destroy (cb->resource);

  meta_wayland_compositor_repick (compositor);

  /* Check that repick didn't pick the freed surface */
  g_assert (surface != compositor->seat->pointer.focus);
  g_assert (surface != compositor->seat->keyboard.focus);

 if (compositor->implicit_grab_surface == surface)
   compositor->implicit_grab_surface = compositor->seat->pointer.current;

  if (surface->resource)
    wl_resource_set_user_data (surface->resource, NULL);
  g_slice_free (MetaWaylandSurface, surface);
}

static void
meta_wayland_surface_resource_destroy_cb (struct wl_resource *resource)
{
  MetaWaylandSurface *surface = wl_resource_get_user_data (resource);

  /* There are four cases here:
     - An X11 unmanaged window -> surface is NULL, nothing to do
     - An X11 unmanaged window, but we got the wayland event first ->
       just clear the resource pointer
     - A wayland surface without window (destroyed before set_toplevel) ->
       need to free the surface itself
     - A wayland window -> need to unmanage
  */

  if (surface)
    {
      surface->resource = NULL;

      /* NB: If the surface corresponds to an X window then we will be
       * sure to free the MetaWindow according to some X event. */
      if (surface->window &&
	  surface->window->client_type == META_WINDOW_CLIENT_TYPE_WAYLAND)
	{
	  MetaDisplay *display = meta_get_display ();
	  guint32 timestamp = meta_display_get_current_time_roundtrip (display);

	  meta_window_unmanage (surface->window, timestamp);
	}
      else
	meta_wayland_surface_free (surface);
    }
}

static void
surface_handle_pending_buffer_destroy (struct wl_listener *listener,
                                       void *data)
{
  MetaWaylandSurface *surface =
    wl_container_of (listener, surface, pending.buffer_destroy_listener);

  surface->pending.buffer = NULL;
}

static void
meta_wayland_compositor_create_surface (struct wl_client *wayland_client,
                                        struct wl_resource *wayland_compositor_resource,
                                        guint32 id)
{
  MetaWaylandCompositor *compositor =
    wl_resource_get_user_data (wayland_compositor_resource);
  MetaWaylandSurface *surface = g_slice_new0 (MetaWaylandSurface);

  surface->compositor = compositor;

  /* a surface inherits the version from the compositor */
  surface->resource = wl_resource_create (wayland_client,
					  &wl_surface_interface,
					  wl_resource_get_version (wayland_compositor_resource),
					  id);
  wl_resource_set_implementation (surface->resource, &meta_wayland_surface_interface, surface,
				  meta_wayland_surface_resource_destroy_cb);

  surface->pending.damage = cairo_region_create ();

  surface->pending.buffer_destroy_listener.notify =
    surface_handle_pending_buffer_destroy;
  wl_list_init (&surface->pending.frame_callback_list);

  compositor->surfaces = g_list_prepend (compositor->surfaces, surface);
}

static void
meta_wayland_region_destroy (struct wl_client *client,
                             struct wl_resource *resource)
{
  wl_resource_destroy (resource);
}

static void
meta_wayland_region_add (struct wl_client *client,
                         struct wl_resource *resource,
                         gint32 x,
                         gint32 y,
                         gint32 width,
                         gint32 height)
{
  MetaWaylandRegion *region = wl_resource_get_user_data (resource);
  cairo_rectangle_int_t rectangle = { x, y, width, height };

  cairo_region_union_rectangle (region->region, &rectangle);
}

static void
meta_wayland_region_subtract (struct wl_client *client,
                              struct wl_resource *resource,
                              gint32 x,
                              gint32 y,
                              gint32 width,
                              gint32 height)
{
  MetaWaylandRegion *region = wl_resource_get_user_data (resource);
  cairo_rectangle_int_t rectangle = { x, y, width, height };

  cairo_region_subtract_rectangle (region->region, &rectangle);
}

const struct wl_region_interface meta_wayland_region_interface = {
  meta_wayland_region_destroy,
  meta_wayland_region_add,
  meta_wayland_region_subtract
};

static void
meta_wayland_region_resource_destroy_cb (struct wl_resource *resource)
{
  MetaWaylandRegion *region = wl_resource_get_user_data (resource);

  cairo_region_destroy (region->region);
  g_slice_free (MetaWaylandRegion, region);
}

static void
meta_wayland_compositor_create_region (struct wl_client *wayland_client,
                                       struct wl_resource *compositor_resource,
                                       uint32_t id)
{
  MetaWaylandRegion *region = g_slice_new0 (MetaWaylandRegion);

  region->resource = wl_resource_create (wayland_client,
					 &wl_region_interface, 1,
					 id);
  wl_resource_set_implementation (region->resource,
				  &meta_wayland_region_interface, region,
				  meta_wayland_region_resource_destroy_cb);

  region->region = cairo_region_create ();
}

static void
bind_output (struct wl_client *client,
             void *data,
             guint32 version,
             guint32 id)
{
  MetaWaylandOutput *output = data;
  struct wl_resource *resource =
    wl_resource_create (client, &wl_output_interface, version, id);
  GList *l;

  wl_resource_post_event (resource,
                          WL_OUTPUT_GEOMETRY,
                          output->x, output->y,
                          output->width_mm,
                          output->height_mm,
                          0, /* subpixel: unknown */
                          "unknown", /* make */
                          "unknown"); /* model */

  for (l = output->modes; l; l = l->next)
    {
      MetaWaylandMode *mode = l->data;
      wl_resource_post_event (resource,
                              WL_OUTPUT_MODE,
                              mode->flags,
                              mode->width,
                              mode->height,
                              mode->refresh);
    }
}

static void
meta_wayland_compositor_create_output (MetaWaylandCompositor *compositor,
                                       int x,
                                       int y,
                                       int width,
                                       int height,
                                       int width_mm,
                                       int height_mm)
{
  MetaWaylandOutput *output = g_slice_new0 (MetaWaylandOutput);
  MetaWaylandMode *mode;
  float final_width, final_height;

  /* XXX: eventually we will support sliced stages and an output should
   * correspond to a slice/CoglFramebuffer, but for now we only support
   * one output so we make sure it always matches the size of the stage
   */
  clutter_actor_set_size (compositor->stage, width, height);

  /* Read back the actual size we were given.
   * XXX: This really needs re-thinking later though so we know the
   * correct output geometry to use. */
  clutter_actor_get_size (compositor->stage, &final_width, &final_height);
  width = final_width;
  height = final_height;

  output->wayland_output.interface = &wl_output_interface;

  output->x = x;
  output->y = y;
  output->width_mm = width_mm;
  output->height_mm = height_mm;

  wl_global_create (compositor->wayland_display,
		    &wl_output_interface, 2,
		    output, bind_output);

  mode = g_slice_new0 (MetaWaylandMode);
  mode->flags = WL_OUTPUT_MODE_CURRENT | WL_OUTPUT_MODE_PREFERRED;
  mode->width = width;
  mode->height = height;
  mode->refresh = 60;

  output->modes = g_list_prepend (output->modes, mode);

  compositor->outputs = g_list_prepend (compositor->outputs, output);
}

const static struct wl_compositor_interface meta_wayland_compositor_interface = {
  meta_wayland_compositor_create_surface,
  meta_wayland_compositor_create_region
};

static void
paint_finished_cb (ClutterActor *self, void *user_data)
{
  MetaWaylandCompositor *compositor = user_data;

  while (!wl_list_empty (&compositor->frame_callbacks))
    {
      MetaWaylandFrameCallback *callback =
        wl_container_of (compositor->frame_callbacks.next, callback, link);

      wl_resource_post_event (callback->resource,
                              WL_CALLBACK_DONE, get_time ());
      wl_resource_destroy (callback->resource);
    }
}

static void
compositor_bind (struct wl_client *client,
		 void *data,
                 guint32 version,
                 guint32 id)
{
  MetaWaylandCompositor *compositor = data;
  struct wl_resource *resource;

  resource = wl_resource_create (client, &wl_compositor_interface, version, id);
  wl_resource_set_implementation (resource, &meta_wayland_compositor_interface, compositor, NULL);
}

static void
shell_surface_pong (struct wl_client *client,
                    struct wl_resource *resource,
                    guint32 serial)
{
}

typedef struct _MetaWaylandGrab
{
  MetaWaylandPointerGrab grab;
  MetaWaylandShellSurface *shell_surface;
  struct wl_listener shell_surface_destroy_listener;
  MetaWaylandPointer *pointer;
} MetaWaylandGrab;

typedef struct _MetaWaylandMoveGrab
{
  MetaWaylandGrab base;
  wl_fixed_t dx, dy;
} MetaWaylandMoveGrab;

static void
destroy_shell_surface_grab_listener (struct wl_listener *listener,
                                     void *data)
{
  MetaWaylandGrab *grab = wl_container_of (listener, grab,
                                           shell_surface_destroy_listener);
  grab->shell_surface = NULL;

  /* XXX: Could we perhaps just stop the grab here so we don't have
   * to consider grab->shell_surface becoming NULL in grab interface
   * callbacks? */
}

typedef enum _GrabCursor
{
  GRAB_CURSOR_MOVE,
} GrabCursor;

static void
grab_pointer (MetaWaylandGrab *grab,
              const MetaWaylandPointerGrabInterface *interface,
              MetaWaylandShellSurface *shell_surface,
              MetaWaylandPointer *pointer,
              GrabCursor cursor)
{
  /* TODO: popup_grab_end (pointer); */

  grab->grab.interface = interface;
  grab->shell_surface = shell_surface;
  grab->shell_surface_destroy_listener.notify =
    destroy_shell_surface_grab_listener;
  wl_resource_add_destroy_listener (shell_surface->resource,
                                    &grab->shell_surface_destroy_listener);

  grab->pointer = pointer;
  grab->grab.focus = shell_surface->surface;

  meta_wayland_pointer_start_grab (pointer, &grab->grab);

  /* TODO: send_grab_cursor (cursor); */

  /* XXX: In Weston there is a desktop shell protocol which has
   * a set_grab_surface request that's used to specify the surface
   * that's focused here.
   *
   * TODO: understand why.
   *
   * XXX: For now we just focus the surface directly associated with
   * the grab.
   */
  meta_wayland_pointer_set_focus (pointer,
                                  grab->shell_surface->surface,
                                  wl_fixed_from_int (0),
                                  wl_fixed_from_int (0));
}

static void
release_pointer (MetaWaylandGrab *grab)
{
  if (grab->shell_surface)
    wl_list_remove (&grab->shell_surface_destroy_listener.link);

  meta_wayland_pointer_end_grab (grab->pointer);
}

static void
noop_grab_focus (MetaWaylandPointerGrab *grab,
                 MetaWaylandSurface *surface,
                 wl_fixed_t x,
                 wl_fixed_t y)
{
  grab->focus = NULL;
}

static void
move_grab_motion (MetaWaylandPointerGrab *grab,
                  uint32_t time,
                  wl_fixed_t x,
                  wl_fixed_t y)
{
  MetaWaylandMoveGrab *move = (MetaWaylandMoveGrab *)grab;
  MetaWaylandPointer *pointer = move->base.pointer;
  MetaWaylandShellSurface *shell_surface = move->base.shell_surface;

  if (!shell_surface)
    return;

  meta_window_move (shell_surface->surface->window,
                    TRUE,
                    wl_fixed_to_int (pointer->x + move->dx),
                    wl_fixed_to_int (pointer->y + move->dy));
}

static void
move_grab_button (MetaWaylandPointerGrab *pointer_grab,
                  uint32_t time,
                  uint32_t button,
                  uint32_t state_w)
{
  MetaWaylandGrab *grab =
    wl_container_of (pointer_grab, grab, grab);
  MetaWaylandMoveGrab *move = (MetaWaylandMoveGrab *)grab;
  MetaWaylandPointer *pointer = grab->pointer;
  enum wl_pointer_button_state state = state_w;

  if (pointer->button_count == 0 && state == WL_POINTER_BUTTON_STATE_RELEASED)
    {
      release_pointer (grab);
      g_slice_free (MetaWaylandMoveGrab, move);
    }
}

static const MetaWaylandPointerGrabInterface move_grab_interface = {
    noop_grab_focus,
    move_grab_motion,
    move_grab_button,
};

static void
start_surface_move (MetaWaylandShellSurface *shell_surface,
                    MetaWaylandSeat *seat)
{
  MetaWaylandMoveGrab *move;
  MetaRectangle rect;

  g_return_if_fail (shell_surface != NULL);

  /* TODO: check if the surface is fullscreen when we support fullscreen */

  move = g_slice_new (MetaWaylandMoveGrab);

  meta_window_get_input_rect (shell_surface->surface->window,
                              &rect);

  move->dx = wl_fixed_from_int (rect.x) - seat->pointer.grab_x;
  move->dy = wl_fixed_from_int (rect.y) - seat->pointer.grab_y;

  grab_pointer (&move->base, &move_grab_interface, shell_surface,
                &seat->pointer, GRAB_CURSOR_MOVE);
}

static void
shell_surface_move (struct wl_client *client,
                    struct wl_resource *resource,
                    struct wl_resource *seat_resource,
                    guint32 serial)
{
  MetaWaylandSeat *seat = wl_resource_get_user_data (seat_resource);
  MetaWaylandShellSurface *shell_surface = wl_resource_get_user_data (resource);

  if (seat->pointer.button_count == 0 ||
      seat->pointer.grab_serial != serial ||
      seat->pointer.focus != shell_surface->surface)
    return;

  start_surface_move (shell_surface, seat);
}

static void
shell_surface_resize (struct wl_client *client,
                      struct wl_resource *resource,
                      struct wl_resource *seat,
                      guint32 serial,
                      guint32 edges)
{
  g_warning ("TODO: support shell_surface_resize request");
}

static void
ensure_surface_window (MetaWaylandSurface *surface)
{
  MetaDisplay *display = meta_get_display ();

  if (!surface->window)
    {
      int width, height;

      if (surface->buffer_ref.buffer)
        {
          MetaWaylandBuffer *buffer = surface->buffer_ref.buffer;
          width = buffer->width;
          height = buffer->width;
        }
      else
        {
          width = 0;
          height = 0;
        }

      surface->window =
        meta_window_new_for_wayland (display, width, height, surface);

      meta_window_calc_showing (surface->window);
    }
}

static void
shell_surface_set_toplevel (struct wl_client *client,
                            struct wl_resource *resource)
{
  MetaWaylandCompositor *compositor = &_meta_wayland_compositor;
  MetaWaylandShellSurface *shell_surface = wl_resource_get_user_data (resource);
  MetaWaylandSurface *surface = shell_surface->surface;

  /* NB: Surfaces from xwayland become managed based on X events. */
  if (client == compositor->xwayland_client)
    return;

  ensure_surface_window (surface);

  meta_window_unmake_fullscreen (surface->window);
}

static void
shell_surface_set_transient (struct wl_client *client,
                             struct wl_resource *resource,
                             struct wl_resource *parent,
                             int x,
                             int y,
                             guint32 flags)
{
  MetaWaylandCompositor *compositor = &_meta_wayland_compositor;
  MetaWaylandShellSurface *shell_surface = wl_resource_get_user_data (resource);
  MetaWaylandSurface *surface = shell_surface->surface;

  /* NB: Surfaces from xwayland become managed based on X events. */
  if (client == compositor->xwayland_client)
    return;

  ensure_surface_window (surface);
}

static void
shell_surface_set_fullscreen (struct wl_client *client,
                              struct wl_resource *resource,
                              guint32 method,
                              guint32 framerate,
                              struct wl_resource *output)
{
  MetaWaylandCompositor *compositor = &_meta_wayland_compositor;
  MetaWaylandShellSurface *shell_surface = wl_resource_get_user_data (resource);
  MetaWaylandSurface *surface = shell_surface->surface;

  /* NB: Surfaces from xwayland become managed based on X events. */
  if (client == compositor->xwayland_client)
    return;

  ensure_surface_window (surface);

  meta_window_make_fullscreen (surface->window);
}

static void
shell_surface_set_popup (struct wl_client *client,
                         struct wl_resource *resource,
                         struct wl_resource *seat,
                         guint32 serial,
                         struct wl_resource *parent,
                         gint32 x,
                         gint32 y,
                         guint32 flags)
{
}

static void
shell_surface_set_maximized (struct wl_client *client,
                             struct wl_resource *resource,
                             struct wl_resource *output)
{
  g_warning ("TODO: support shell_surface_set_maximized request");
}

static void
shell_surface_set_title (struct wl_client *client,
                         struct wl_resource *resource,
                         const char *title)
{
  g_warning ("TODO: support shell_surface_set_title request");
}

static void
shell_surface_set_class (struct wl_client *client,
                         struct wl_resource *resource,
                         const char *class_)
{
  g_warning ("TODO: support shell_surface_set_class request");
}

static const struct wl_shell_surface_interface meta_wayland_shell_surface_interface =
{
  shell_surface_pong,
  shell_surface_move,
  shell_surface_resize,
  shell_surface_set_toplevel,
  shell_surface_set_transient,
  shell_surface_set_fullscreen,
  shell_surface_set_popup,
  shell_surface_set_maximized,
  shell_surface_set_title,
  shell_surface_set_class
};

static void
shell_handle_surface_destroy (struct wl_listener *listener,
                              void *data)
{
  MetaWaylandShellSurface *shell_surface =
    wl_container_of (listener, shell_surface, surface_destroy_listener);
  shell_surface->surface->has_shell_surface = FALSE;
  shell_surface->surface = NULL;
  wl_resource_destroy (shell_surface->resource);
}

static void
destroy_shell_surface (struct wl_resource *resource)
{
  MetaWaylandShellSurface *shell_surface = wl_resource_get_user_data (resource);

  /* In case cleaning up a dead client destroys shell_surface first */
  if (shell_surface->surface)
    {
      wl_list_remove (&shell_surface->surface_destroy_listener.link);
      shell_surface->surface->has_shell_surface = FALSE;
    }

  g_free (shell_surface);
}

static void
get_shell_surface (struct wl_client *client,
                   struct wl_resource *resource,
                   guint32 id,
                   struct wl_resource *surface_resource)
{
  MetaWaylandSurface *surface = wl_resource_get_user_data (surface_resource);
  MetaWaylandShellSurface *shell_surface;

  if (surface->has_shell_surface)
    {
      wl_resource_post_error (surface_resource,
                              WL_DISPLAY_ERROR_INVALID_OBJECT,
                              "wl_shell::get_shell_surface already requested");
      return;
    }

  shell_surface = g_new0 (MetaWaylandShellSurface, 1);

  /* a shell surface inherits the version from the shell */
  shell_surface->resource =
    wl_resource_create (client, &wl_shell_surface_interface,
			wl_resource_get_version (resource), id);
  wl_resource_set_implementation (shell_surface->resource, &meta_wayland_shell_surface_interface,
				  shell_surface, destroy_shell_surface);

  shell_surface->surface = surface;
  shell_surface->surface_destroy_listener.notify = shell_handle_surface_destroy;
  wl_resource_add_destroy_listener (surface->resource,
                                    &shell_surface->surface_destroy_listener);
  surface->has_shell_surface = TRUE;
}

static const struct wl_shell_interface meta_wayland_shell_interface =
{
  get_shell_surface
};

static void
bind_shell (struct wl_client *client,
            void *data,
            guint32 version,
            guint32 id)
{
  struct wl_resource *resource;

  resource = wl_resource_create (client, &wl_shell_interface, version, id);
  wl_resource_set_implementation (resource, &meta_wayland_shell_interface, data, NULL);
}

static void
stage_destroy_cb (void)
{
  meta_quit (META_EXIT_SUCCESS);
}

#define N_BUTTONS 5

static void
synthesize_motion_event (MetaWaylandCompositor *compositor,
                         const ClutterEvent *event)
{
  /* We want to synthesize X events for mouse motion events so that we
     don't have to rely on the X server's window position being
     synched with the surface position. See the comment in
     event_callback() in display.c */
  MetaWaylandSeat *seat = compositor->seat;
  MetaWaylandPointer *pointer = &seat->pointer;
  MetaWaylandSurface *surface;
  XGenericEventCookie generic_event;
  XIDeviceEvent device_event;
  unsigned char button_mask[(N_BUTTONS + 7) / 8] = { 0 };
  MetaDisplay *display = meta_get_display ();
  ClutterModifierType state;
  int i;

  generic_event.type = GenericEvent;
  generic_event.serial = 0;
  generic_event.send_event = False;
  generic_event.display = display->xdisplay;
  generic_event.extension = display->xinput_opcode;
  generic_event.evtype = XI_Motion;
  /* Mutter assumes the data for the event is already retrieved by GDK
   * so we don't need the cookie */
  generic_event.cookie = 0;
  generic_event.data = &device_event;

  memcpy (&device_event, &generic_event, sizeof (XGenericEvent));

  device_event.time = clutter_event_get_time (event);
  device_event.deviceid = clutter_event_get_device_id (event);
  device_event.sourceid = 0; /* not used, not sure what this should be */
  device_event.detail = 0;
  device_event.root = DefaultRootWindow (display->xdisplay);
  device_event.flags = 0 /* not used for motion events */;

  if (compositor->implicit_grab_surface)
    surface = compositor->implicit_grab_surface;
  else
    surface = pointer->current;

  if (surface == pointer->current)
    {
      device_event.event_x = wl_fixed_to_int (pointer->current_x);
      device_event.event_y = wl_fixed_to_int (pointer->current_y);
    }
  else if (surface && surface->window)
    {
      ClutterActor *window_actor =
        CLUTTER_ACTOR (meta_window_get_compositor_private (surface->window));

      if (window_actor)
        {
          float ax, ay;

          clutter_actor_transform_stage_point (window_actor,
                                               wl_fixed_to_double (pointer->x),
                                               wl_fixed_to_double (pointer->y),
                                               &ax, &ay);

          device_event.event_x = ax;
          device_event.event_y = ay;
        }
      else
        {
          device_event.event_x = wl_fixed_to_double (pointer->x);
          device_event.event_y = wl_fixed_to_double (pointer->y);
        }
    }
  else
    {
      device_event.event_x = wl_fixed_to_double (pointer->x);
      device_event.event_y = wl_fixed_to_double (pointer->y);
    }

  if (surface && surface->xid != None)
    device_event.event = surface->xid;
  else
    device_event.event = device_event.root;

  /* Mutter doesn't really know about the sub-windows. This assumes it
     doesn't care either */
  device_event.child = device_event.event;
  device_event.root_x = wl_fixed_to_double (pointer->x);
  device_event.root_y = wl_fixed_to_double (pointer->y);

  state = clutter_event_get_state (event);

  for (i = 0; i < N_BUTTONS; i++)
    if ((state & (CLUTTER_BUTTON1_MASK << i)))
      XISetMask (button_mask, i + 1);
  device_event.buttons.mask_len = N_BUTTONS + 1;
  device_event.buttons.mask = button_mask;

  device_event.valuators.mask_len = 0;
  device_event.valuators.mask = NULL;
  device_event.valuators.values = NULL;

  memset (&device_event.mods, 0, sizeof (device_event.mods));
  device_event.mods.effective =
    state & (CLUTTER_MODIFIER_MASK &
             ~(((CLUTTER_BUTTON1_MASK << N_BUTTONS) - 1) ^
               (CLUTTER_BUTTON1_MASK - 1)));

  memset (&device_event.group, 0, sizeof (device_event.group));

  meta_display_handle_event (display, (XEvent *) &generic_event);
}

static gboolean
event_cb (ClutterActor *stage,
          const ClutterEvent *event,
          MetaWaylandCompositor *compositor)
{
  MetaWaylandSeat *seat = compositor->seat;
  MetaWaylandPointer *pointer = &seat->pointer;
  MetaWaylandSurface *surface;
  MetaDisplay *display;

  meta_wayland_seat_handle_event (compositor->seat, event);

  /* HACK: for now, the surfaces from Wayland clients aren't
     integrated into Mutter's event handling and Mutter won't give them
     focus on mouse clicks. As a hack to work around this we can just
     give them input focus on mouse clicks so we can at least test the
     keyboard support */
  if (event->type == CLUTTER_BUTTON_PRESS)
    {
      surface = pointer->current;

      if (surface && surface->window &&
	  surface->window->client_type == META_WINDOW_CLIENT_TYPE_WAYLAND)
        {
	  MetaDisplay *display = meta_get_display ();
	  guint32 timestamp = meta_display_get_current_time_roundtrip (display);

	  meta_window_focus (surface->window, timestamp);
        }
    }

  if (seat->cursor_tracker)
    {
      meta_cursor_tracker_update_position (seat->cursor_tracker,
					   wl_fixed_to_int (pointer->x),
					   wl_fixed_to_int (pointer->y));

      if (pointer->current == NULL)
	meta_cursor_tracker_revert_root (seat->cursor_tracker);

      meta_cursor_tracker_queue_redraw (seat->cursor_tracker, stage);
    }

  display = meta_get_display ();
  if (!display)
    return FALSE;

  switch (event->type)
    {
    case CLUTTER_BUTTON_PRESS:
      if (compositor->implicit_grab_surface == NULL)
        {
          compositor->implicit_grab_button = event->button.button;
          compositor->implicit_grab_surface = pointer->current;
        }
      return FALSE;

    case CLUTTER_BUTTON_RELEASE:
      if (event->type == CLUTTER_BUTTON_RELEASE &&
          compositor->implicit_grab_surface &&
          event->button.button == compositor->implicit_grab_button)
        compositor->implicit_grab_surface = NULL;
      return FALSE;

    case CLUTTER_MOTION:
      synthesize_motion_event (compositor, event);
      return FALSE;

    default:
      return FALSE;
    }
}

static gboolean
event_emission_hook_cb (GSignalInvocationHint *ihint,
                        guint n_param_values,
                        const GValue *param_values,
                        gpointer data)
{
  MetaWaylandCompositor *compositor = data;
  ClutterActor *actor;
  ClutterEvent *event;

  g_return_val_if_fail (n_param_values == 2, FALSE);

  actor = g_value_get_object (param_values + 0);
  event = g_value_get_boxed (param_values + 1);

  if (actor == NULL)
    return TRUE /* stay connected */;

  /* If this event belongs to the corresponding grab for this event
   * type then the captured-event signal won't be emitted so we have
   * to manually forward it on */

  switch (event->type)
    {
      /* Pointer events */
    case CLUTTER_MOTION:
    case CLUTTER_ENTER:
    case CLUTTER_LEAVE:
    case CLUTTER_BUTTON_PRESS:
    case CLUTTER_BUTTON_RELEASE:
    case CLUTTER_SCROLL:
      if (actor == clutter_get_pointer_grab ())
        event_cb (clutter_actor_get_stage (actor),
                  event,
                  compositor);
      break;

      /* Keyboard events */
    case CLUTTER_KEY_PRESS:
    case CLUTTER_KEY_RELEASE:
      if (actor == clutter_get_keyboard_grab ())
        event_cb (clutter_actor_get_stage (actor),
                  event,
                  compositor);

    default:
      break;
    }

  return TRUE /* stay connected */;
}

void
meta_wayland_init (void)
{
  MetaWaylandCompositor *compositor = &_meta_wayland_compositor;
  guint event_signal;

  memset (compositor, 0, sizeof (MetaWaylandCompositor));

  compositor->wayland_display = wl_display_create ();
  if (compositor->wayland_display == NULL)
    g_error ("failed to create wayland display");

  wl_display_init_shm (compositor->wayland_display);

  wl_list_init (&compositor->frame_callbacks);

  if (!wl_global_create (compositor->wayland_display,
			 &wl_compositor_interface, 3,
			 compositor, compositor_bind))
    g_error ("Failed to register wayland compositor object");

  compositor->wayland_loop =
    wl_display_get_event_loop (compositor->wayland_display);
  compositor->wayland_event_source =
    wayland_event_source_new (compositor->wayland_display);

  /* XXX: Here we are setting the wayland event source to have a
   * slightly lower priority than the X event source, because we are
   * much more likely to get confused being told about surface changes
   * relating to X clients when we don't know what's happened to them
   * according to the X protocol.
   *
   * At some point we could perhaps try and get the X protocol proxied
   * over the wayland protocol so that we don't have to worry about
   * synchronizing the two command streams. */
  g_source_set_priority (compositor->wayland_event_source,
                         GDK_PRIORITY_EVENTS + 1);
  g_source_attach (compositor->wayland_event_source, NULL);

  clutter_wayland_set_compositor_display (compositor->wayland_display);

  if (clutter_init (NULL, NULL) != CLUTTER_INIT_SUCCESS)
    g_error ("Failed to initialize Clutter");

  compositor->stage = meta_wayland_stage_new ();
  clutter_stage_set_user_resizable (CLUTTER_STAGE (compositor->stage), FALSE);
  g_signal_connect_after (compositor->stage, "paint",
                          G_CALLBACK (paint_finished_cb), compositor);
  g_signal_connect (compositor->stage, "destroy",
                    G_CALLBACK (stage_destroy_cb), NULL);

  meta_wayland_data_device_manager_init (compositor->wayland_display);

  compositor->seat = meta_wayland_seat_new (compositor->wayland_display);

  g_signal_connect (compositor->stage,
                    "captured-event",
                    G_CALLBACK (event_cb),
                    compositor);
  /* If something sets a grab on an actor then the captured event
   * signal won't get emitted but we still want to see these events so
   * we can update the cursor position. To make sure we see all events
   * we also install an emission hook on the event signal */
  event_signal = g_signal_lookup ("event", CLUTTER_TYPE_STAGE);
  g_signal_add_emission_hook (event_signal,
                              0 /* detail */,
                              event_emission_hook_cb,
                              compositor, /* hook_data */
                              NULL /* data_destroy */);

  meta_wayland_compositor_create_output (compositor, 0, 0, 1024, 600, 222, 125);

  if (wl_global_create (compositor->wayland_display,
			&wl_shell_interface, 1,
			compositor, bind_shell) == NULL)
    g_error ("Failed to register a global shell object");

  clutter_actor_show (compositor->stage);

  if (wl_display_add_socket (compositor->wayland_display, "wayland-0"))
    g_error ("Failed to create socket");

  /* XXX: It's important that we only try and start xwayland after we
   * have initialized EGL because EGL implements the "wl_drm"
   * interface which xwayland requires to determine what drm device
   * name it should use.
   *
   * By waiting until we've shown the stage above we ensure that the
   * underlying GL resources for the surface have also been allocated
   * and so EGL must be initialized by this point.
   */

  if (!meta_xwayland_start (compositor))
    g_error ("Failed to start X Wayland");

  putenv (g_strdup_printf ("DISPLAY=:%d", compositor->xwayland_display_index));
}

void
meta_wayland_finalize (void)
{
  meta_xwayland_stop (meta_wayland_compositor_get_default ());
}