[mutter/wip/garnacho/touchpad-gestures: 14/15] wayland: Implement the wl_pointer_gesture_pinch interface

[Carlos Garnacho <carlosg src gnome org>]

commit 210ef1cb88fd0c26f97e9a875530ece233faf2d8
Author: Carlos Garnacho <carlosg gnome org>
Date:   Wed Jul 22 16:46:55 2015 +0200

    wayland: Implement the wl_pointer_gesture_pinch interface
    
    The pinch gesture resources are part of the MetaWaylandPointerClient, which
    will be used during the propagation of CLUTTER_TOUCHPAD_PINCH events.

 src/Makefile.am                                  |    2 +
 src/wayland/meta-wayland-pointer-gesture-pinch.c |  163 ++++++++++++++++++++++
 src/wayland/meta-wayland-pointer-gesture-pinch.h |   39 +++++
 src/wayland/meta-wayland-pointer.c               |   13 ++-
 src/wayland/meta-wayland-pointer.h               |    2 +
 src/wayland/meta-wayland-seat.c                  |    1 +
 6 files changed, 219 insertions(+), 1 deletions(-)
---
diff --git a/src/Makefile.am b/src/Makefile.am
index cde9394..74b5a33 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -257,6 +257,8 @@ libmutter_la_SOURCES +=                             \
        wayland/meta-wayland-data-device-private.h      \
        wayland/meta-wayland-pointer-gesture-swipe.c    \
        wayland/meta-wayland-pointer-gesture-swipe.h    \
+       wayland/meta-wayland-pointer-gesture-pinch.c    \
+       wayland/meta-wayland-pointer-gesture-pinch.h    \
        wayland/meta-wayland-keyboard.c         \
        wayland/meta-wayland-keyboard.h         \
        wayland/meta-wayland-pointer.c          \
diff --git a/src/wayland/meta-wayland-pointer-gesture-pinch.c 
b/src/wayland/meta-wayland-pointer-gesture-pinch.c
new file mode 100644
index 0000000..18d1bec
--- /dev/null
+++ b/src/wayland/meta-wayland-pointer-gesture-pinch.c
@@ -0,0 +1,163 @@
+/*
+ * Wayland Support
+ *
+ * Copyright (C) 2015 Red Hat
+ *
+ * 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.
+ *
+ * Author: Carlos Garnacho <carlosg gnome org>
+ */
+
+#define _GNU_SOURCE
+
+#include "config.h"
+
+#include <glib.h>
+
+#include "meta-wayland-pointer-gesture-pinch.h"
+#include "meta-wayland-pointer.h"
+#include "meta-wayland-surface.h"
+#include "pointer-gestures-server-protocol.h"
+
+static void
+handle_pinch_begin (MetaWaylandPointer *pointer,
+                    const ClutterEvent *event)
+{
+  MetaWaylandPointerClient *pointer_client;
+  struct wl_resource *resource;
+  uint32_t serial;
+
+  pointer_client = pointer->focus_client;
+  g_return_if_fail (pointer_client != NULL);
+
+  serial = wl_display_next_serial (pointer->display);
+
+  wl_resource_for_each (resource, &pointer_client->pinch_gesture_resources)
+    {
+      _wl_pointer_gesture_pinch_send_begin (resource, serial,
+                                            clutter_event_get_time (event),
+                                            pointer->focus_surface->resource,
+                                            2);
+    }
+}
+
+static void
+handle_pinch_update (MetaWaylandPointer *pointer,
+                     const ClutterEvent *event)
+{
+  MetaWaylandPointerClient *pointer_client;
+  struct wl_resource *resource;
+  gdouble dx, dy, scale, rotation;
+
+  pointer_client = pointer->focus_client;
+  g_return_if_fail (pointer_client != NULL);
+
+  clutter_event_get_gesture_motion_delta (event, &dx, &dy);
+  rotation = clutter_event_get_gesture_pinch_angle_delta (event);
+  scale = clutter_event_get_gesture_pinch_scale (event);
+
+  wl_resource_for_each (resource, &pointer_client->pinch_gesture_resources)
+    {
+      _wl_pointer_gesture_pinch_send_update (resource,
+                                             clutter_event_get_time (event),
+                                             wl_fixed_from_double (dx),
+                                             wl_fixed_from_double (dy),
+                                             wl_fixed_from_double (scale),
+                                             wl_fixed_from_double (rotation));
+    }
+}
+
+static void
+handle_pinch_end (MetaWaylandPointer *pointer,
+                  const ClutterEvent *event)
+{
+  MetaWaylandPointerClient *pointer_client;
+  struct wl_resource *resource;
+  gboolean cancelled = FALSE;
+  uint32_t serial;
+
+  pointer_client = pointer->focus_client;
+  g_return_if_fail (pointer_client != NULL);
+
+  serial = wl_display_next_serial (pointer->display);
+
+  if (event->touchpad_pinch.phase == CLUTTER_TOUCHPAD_GESTURE_PHASE_CANCEL)
+    cancelled = TRUE;
+
+  wl_resource_for_each (resource, &pointer_client->pinch_gesture_resources)
+    {
+      _wl_pointer_gesture_pinch_send_end (resource, serial,
+                                          clutter_event_get_time (event),
+                                          cancelled);
+    }
+}
+
+gboolean
+meta_wayland_pointer_gesture_pinch_handle_event (MetaWaylandPointer *pointer,
+                                                 const ClutterEvent *event)
+{
+  if (event->type != CLUTTER_TOUCHPAD_PINCH)
+    return FALSE;
+
+  switch (event->touchpad_pinch.phase)
+    {
+    case CLUTTER_TOUCHPAD_GESTURE_PHASE_BEGIN:
+      handle_pinch_begin (pointer, event);
+      break;
+    case CLUTTER_TOUCHPAD_GESTURE_PHASE_UPDATE:
+      handle_pinch_update (pointer, event);
+      break;
+    case CLUTTER_TOUCHPAD_GESTURE_PHASE_END:
+    case CLUTTER_TOUCHPAD_GESTURE_PHASE_CANCEL:
+      handle_pinch_end (pointer, event);
+      break;
+    default:
+      return FALSE;
+    }
+
+  return TRUE;
+}
+
+static void
+pointer_gesture_pinch_destroy (struct wl_client   *client,
+                               struct wl_resource *resource)
+{
+  wl_resource_destroy (resource);
+}
+
+static const struct _wl_pointer_gesture_pinch_interface pointer_gesture_pinch_interface = {
+  pointer_gesture_pinch_destroy
+};
+
+void
+meta_wayland_pointer_gesture_pinch_create_new_resource (MetaWaylandPointer *pointer,
+                                                        struct wl_client   *client,
+                                                        struct wl_resource *gestures_resource,
+                                                        uint32_t            id)
+{
+  MetaWaylandPointerClient *pointer_client;
+  struct wl_resource *res;
+
+  pointer_client = meta_wayland_pointer_get_pointer_client (pointer, client);
+  g_return_if_fail (pointer_client != NULL);
+
+  res = wl_resource_create (client, &_wl_pointer_gesture_pinch_interface,
+                            wl_resource_get_version (gestures_resource), id);
+  wl_resource_set_implementation (res, &pointer_gesture_pinch_interface, pointer,
+                                  meta_wayland_pointer_unbind_pointer_client_resource);
+  wl_list_insert (&pointer_client->pinch_gesture_resources,
+                  wl_resource_get_link (res));
+}
diff --git a/src/wayland/meta-wayland-pointer-gesture-pinch.h 
b/src/wayland/meta-wayland-pointer-gesture-pinch.h
new file mode 100644
index 0000000..9c4c691
--- /dev/null
+++ b/src/wayland/meta-wayland-pointer-gesture-pinch.h
@@ -0,0 +1,39 @@
+/*
+ * Wayland Support
+ *
+ * Copyright (C) 2015 Red Hat
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Author: Carlos Garnacho <carlosg gnome org>
+ */
+
+#ifndef META_WAYLAND_POINTER_GESTURE_PINCH_H
+#define META_WAYLAND_POINTER_GESTURE_PINCH_H
+
+#include <wayland-server.h>
+#include <clutter/clutter.h>
+#include <glib.h>
+
+#include "meta-wayland-types.h"
+
+gboolean meta_wayland_pointer_gesture_pinch_handle_event (MetaWaylandPointer *pointer,
+                                                          const ClutterEvent *event);
+
+void meta_wayland_pointer_gesture_pinch_create_new_resource (MetaWaylandPointer *pointer,
+                                                             struct wl_client   *client,
+                                                             struct wl_resource *gestures_resource,
+                                                             uint32_t            id);
+
+#endif /* META_WAYLAND_POINTER_GESTURE_PINCH_H */
diff --git a/src/wayland/meta-wayland-pointer.c b/src/wayland/meta-wayland-pointer.c
index 50066c0..7a34d92 100644
--- a/src/wayland/meta-wayland-pointer.c
+++ b/src/wayland/meta-wayland-pointer.c
@@ -66,6 +66,7 @@ meta_wayland_pointer_client_new (void)
   pointer_client = g_slice_new0 (MetaWaylandPointerClient);
   wl_list_init (&pointer_client->pointer_resources);
   wl_list_init (&pointer_client->swipe_gesture_resources);
+  wl_list_init (&pointer_client->pinch_gesture_resources);
 
   return pointer_client;
 }
@@ -89,6 +90,11 @@ meta_wayland_pointer_client_free (MetaWaylandPointerClient *pointer_client)
       wl_list_remove (wl_resource_get_link (resource));
       wl_list_init (wl_resource_get_link (resource));
     }
+  wl_resource_for_each (resource, &pointer_client->pinch_gesture_resources)
+    {
+      wl_list_remove (wl_resource_get_link (resource));
+      wl_list_init (wl_resource_get_link (resource));
+    }
 
   g_slice_free (MetaWaylandPointerClient, pointer_client);
 }
@@ -97,7 +103,8 @@ static gboolean
 meta_wayland_pointer_client_is_empty (MetaWaylandPointerClient *pointer_client)
 {
   return (wl_list_empty (&pointer_client->pointer_resources) &&
-          wl_list_empty (&pointer_client->swipe_gesture_resources));
+          wl_list_empty (&pointer_client->swipe_gesture_resources) &&
+          wl_list_empty (&pointer_client->pinch_gesture_resources));
 }
 
 MetaWaylandPointerClient *
@@ -546,6 +553,10 @@ meta_wayland_pointer_handle_event (MetaWaylandPointer *pointer,
       meta_wayland_pointer_gesture_swipe_handle_event (pointer, event);
       break;
 
+    case CLUTTER_TOUCHPAD_PINCH:
+      meta_wayland_pointer_gesture_pinch_handle_event (pointer, event);
+      break;
+
     default:
       break;
     }
diff --git a/src/wayland/meta-wayland-pointer.h b/src/wayland/meta-wayland-pointer.h
index 1d28116..2947260 100644
--- a/src/wayland/meta-wayland-pointer.h
+++ b/src/wayland/meta-wayland-pointer.h
@@ -26,6 +26,7 @@
 
 #include "meta-wayland-types.h"
 #include "meta-wayland-pointer-gesture-swipe.h"
+#include "meta-wayland-pointer-gesture-pinch.h"
 
 #include <meta/meta-cursor-tracker.h>
 
@@ -49,6 +50,7 @@ struct _MetaWaylandPointerClient
 {
   struct wl_list pointer_resources;
   struct wl_list swipe_gesture_resources;
+  struct wl_list pinch_gesture_resources;
 };
 
 struct _MetaWaylandPointer
diff --git a/src/wayland/meta-wayland-seat.c b/src/wayland/meta-wayland-seat.c
index ec9c6c8..58f2697 100644
--- a/src/wayland/meta-wayland-seat.c
+++ b/src/wayland/meta-wayland-seat.c
@@ -333,6 +333,7 @@ meta_wayland_seat_handle_event (MetaWaylandSeat *seat,
     case CLUTTER_BUTTON_RELEASE:
     case CLUTTER_SCROLL:
     case CLUTTER_TOUCHPAD_SWIPE:
+    case CLUTTER_TOUCHPAD_PINCH:
       return meta_wayland_pointer_handle_event (&seat->pointer, event);
 
     case CLUTTER_KEY_PRESS: