[mutter] cursor-tracker: Move out more X11:isms to the X11 backend

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 3d19b8f49ca7a21c370885447ef7492e1a55381d
Author: Jonas Ådahl <jadahl gmail com>
Date:   Fri Jul 31 21:08:15 2020 +0200

    cursor-tracker: Move out more X11:isms to the X11 backend
    
    This includes the xfixes cursor management.
    
    https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1391

 src/backends/meta-cursor-tracker-private.h |   7 +-
 src/backends/meta-cursor-tracker.c         | 103 +++++++----------------------
 src/backends/x11/meta-cursor-tracker-x11.c |  56 ++++++++++++++++
 src/backends/x11/meta-cursor-tracker-x11.h |   3 +
 src/x11/events.c                           |  13 +++-
 5 files changed, 96 insertions(+), 86 deletions(-)
---
diff --git a/src/backends/meta-cursor-tracker-private.h b/src/backends/meta-cursor-tracker-private.h
index 2a3d99a13e..60f8e899c0 100644
--- a/src/backends/meta-cursor-tracker-private.h
+++ b/src/backends/meta-cursor-tracker-private.h
@@ -24,7 +24,6 @@
 
 #include "backends/meta-cursor.h"
 #include "backends/meta-cursor-renderer.h"
-#include "backends/x11/cm/meta-cursor-sprite-xfixes.h"
 #include "meta/meta-cursor-tracker.h"
 
 struct _MetaCursorTrackerClass
@@ -33,11 +32,9 @@ struct _MetaCursorTrackerClass
 
   void (* set_force_track_position) (MetaCursorTracker *tracker,
                                      gboolean           is_enabled);
+  MetaCursorSprite * (* get_sprite) (MetaCursorTracker *tracker);
 };
 
-gboolean meta_cursor_tracker_handle_xevent (MetaCursorTracker *tracker,
-                                           XEvent            *xevent);
-
 void     meta_cursor_tracker_set_window_cursor   (MetaCursorTracker *tracker,
                                                   MetaCursorSprite  *cursor_sprite);
 void     meta_cursor_tracker_unset_window_cursor (MetaCursorTracker *tracker);
@@ -54,4 +51,6 @@ void meta_cursor_tracker_untrack_position (MetaCursorTracker *tracker);
 
 MetaCursorSprite * meta_cursor_tracker_get_displayed_cursor (MetaCursorTracker *tracker);
 
+void meta_cursor_tracker_notify_cursor_changed (MetaCursorTracker *tracker);
+
 #endif
diff --git a/src/backends/meta-cursor-tracker.c b/src/backends/meta-cursor-tracker.c
index a411413e27..5a9d5f226b 100644
--- a/src/backends/meta-cursor-tracker.c
+++ b/src/backends/meta-cursor-tracker.c
@@ -36,14 +36,12 @@
 #include <string.h>
 
 #include "backends/meta-backend-private.h"
-#include "backends/x11/cm/meta-cursor-sprite-xfixes.h"
 #include "cogl/cogl.h"
+#include "core/display-private.h"
 #include "clutter/clutter.h"
 #include "meta-marshal.h"
 #include "meta/main.h"
-#include "meta/meta-x11-errors.h"
 #include "meta/util.h"
-#include "x11/meta-x11-display-private.h"
 
 enum
 {
@@ -79,9 +77,6 @@ typedef struct _MetaCursorTrackerPrivate
   MetaCursorSprite *window_cursor;
 
   MetaCursorSprite *root_cursor;
-
-  /* The cursor from the X11 server. */
-  MetaCursorSpriteXfixes *xfixes_cursor;
 } MetaCursorTrackerPrivate;
 
 G_DEFINE_TYPE_WITH_PRIVATE (MetaCursorTracker, meta_cursor_tracker,
@@ -97,6 +92,12 @@ enum
 
 static guint signals[LAST_SIGNAL];
 
+void
+meta_cursor_tracker_notify_cursor_changed (MetaCursorTracker *tracker)
+{
+  g_signal_emit (tracker, signals[CURSOR_CHANGED], 0);
+}
+
 static void
 cursor_texture_updated (MetaCursorSprite  *cursor,
                         MetaCursorTracker *tracker)
@@ -183,6 +184,15 @@ meta_cursor_tracker_real_set_force_track_position (MetaCursorTracker *tracker,
 {
 }
 
+static MetaCursorSprite *
+meta_cursor_tracker_real_get_sprite (MetaCursorTracker *tracker)
+{
+  MetaCursorTrackerPrivate *priv =
+    meta_cursor_tracker_get_instance_private (tracker);
+
+  return priv->displayed_cursor;
+}
+
 static void
 meta_cursor_tracker_init (MetaCursorTracker *tracker)
 {
@@ -261,6 +271,8 @@ meta_cursor_tracker_class_init (MetaCursorTrackerClass *klass)
 
   klass->set_force_track_position =
     meta_cursor_tracker_real_set_force_track_position;
+  klass->get_sprite =
+    meta_cursor_tracker_real_get_sprite;
 
   obj_props[PROP_BACKEND] =
     g_param_spec_object ("backend",
@@ -341,47 +353,6 @@ set_window_cursor (MetaCursorTracker *tracker,
   sync_cursor (tracker);
 }
 
-gboolean
-meta_cursor_tracker_handle_xevent (MetaCursorTracker *tracker,
-                                   XEvent            *xevent)
-{
-  MetaCursorTrackerPrivate *priv =
-    meta_cursor_tracker_get_instance_private (tracker);
-  MetaX11Display *x11_display = meta_get_display ()->x11_display;
-  XFixesCursorNotifyEvent *notify_event;
-
-  if (meta_is_wayland_compositor ())
-    return FALSE;
-
-  if (xevent->xany.type != x11_display->xfixes_event_base + XFixesCursorNotify)
-    return FALSE;
-
-  notify_event = (XFixesCursorNotifyEvent *)xevent;
-  if (notify_event->subtype != XFixesDisplayCursorNotify)
-    return FALSE;
-
-  g_clear_object (&priv->xfixes_cursor);
-  g_signal_emit (tracker, signals[CURSOR_CHANGED], 0);
-
-  return TRUE;
-}
-
-static void
-ensure_xfixes_cursor (MetaCursorTracker *tracker)
-{
-  MetaCursorTrackerPrivate *priv =
-    meta_cursor_tracker_get_instance_private (tracker);
-  MetaDisplay *display = meta_get_display ();
-  g_autoptr (GError) error = NULL;
-
-  if (priv->xfixes_cursor)
-    return;
-
-  priv->xfixes_cursor = meta_cursor_sprite_xfixes_new (display, &error);
-  if (!priv->xfixes_cursor)
-    g_warning ("Failed to create XFIXES cursor: %s", error->message);
-}
-
 /**
  * meta_cursor_tracker_get_sprite:
  *
@@ -390,31 +361,15 @@ ensure_xfixes_cursor (MetaCursorTracker *tracker)
 CoglTexture *
 meta_cursor_tracker_get_sprite (MetaCursorTracker *tracker)
 {
-  MetaCursorTrackerPrivate *priv =
-    meta_cursor_tracker_get_instance_private (tracker);
   MetaCursorSprite *cursor_sprite;
 
-  g_return_val_if_fail (META_IS_CURSOR_TRACKER (tracker), NULL);
+  cursor_sprite = META_CURSOR_TRACKER_GET_CLASS (tracker)->get_sprite (tracker);
 
-  if (meta_is_wayland_compositor ())
-    {
-      cursor_sprite = priv->displayed_cursor;
-    }
-  else
-    {
-      ensure_xfixes_cursor (tracker);
-      cursor_sprite = META_CURSOR_SPRITE (priv->xfixes_cursor);
-    }
+  if (!cursor_sprite)
+    return NULL;
 
-  if (cursor_sprite)
-    {
-      meta_cursor_sprite_realize_texture (cursor_sprite);
-      return meta_cursor_sprite_get_cogl_texture (cursor_sprite);
-    }
-  else
-    {
-      return NULL;
-    }
+  meta_cursor_sprite_realize_texture (cursor_sprite);
+  return meta_cursor_sprite_get_cogl_texture (cursor_sprite);
 }
 
 /**
@@ -429,21 +384,11 @@ meta_cursor_tracker_get_hot (MetaCursorTracker *tracker,
                              int               *x,
                              int               *y)
 {
-  MetaCursorTrackerPrivate *priv =
-    meta_cursor_tracker_get_instance_private (tracker);
   MetaCursorSprite *cursor_sprite;
 
   g_return_if_fail (META_IS_CURSOR_TRACKER (tracker));
 
-  if (meta_is_wayland_compositor ())
-    {
-      cursor_sprite = priv->displayed_cursor;
-    }
-  else
-    {
-      ensure_xfixes_cursor (tracker);
-      cursor_sprite = META_CURSOR_SPRITE (priv->xfixes_cursor);
-    }
+  cursor_sprite = META_CURSOR_TRACKER_GET_CLASS (tracker)->get_sprite (tracker);
 
   if (cursor_sprite)
     meta_cursor_sprite_get_hotspot (cursor_sprite, x, y);
diff --git a/src/backends/x11/meta-cursor-tracker-x11.c b/src/backends/x11/meta-cursor-tracker-x11.c
index f47ca9c23d..6f718f9e89 100644
--- a/src/backends/x11/meta-cursor-tracker-x11.c
+++ b/src/backends/x11/meta-cursor-tracker-x11.c
@@ -22,7 +22,10 @@
 
 #include "backends/x11/meta-cursor-tracker-x11.h"
 
+#include "backends/x11/cm/meta-cursor-sprite-xfixes.h"
 #include "clutter/clutter-private.h"
+#include "meta/meta-x11-errors.h"
+#include "x11/meta-x11-display-private.h"
 
 #define UPDATE_POSITION_TIMEOUT_MS (ms (100))
 
@@ -32,11 +35,36 @@ struct _MetaCursorTrackerX11
 
   gboolean is_force_track_position_enabled;
   guint update_position_timeout_id;
+
+  MetaCursorSpriteXfixes *xfixes_cursor;
 };
 
 G_DEFINE_TYPE (MetaCursorTrackerX11, meta_cursor_tracker_x11,
                META_TYPE_CURSOR_TRACKER)
 
+static void
+ensure_xfixes_cursor (MetaCursorTrackerX11 *tracker_x11);
+
+gboolean
+meta_cursor_tracker_x11_handle_xevent (MetaCursorTrackerX11 *tracker_x11,
+                                       XEvent               *xevent)
+{
+  MetaX11Display *x11_display = meta_get_display ()->x11_display;
+  XFixesCursorNotifyEvent *notify_event;
+
+  if (xevent->xany.type != x11_display->xfixes_event_base + XFixesCursorNotify)
+    return FALSE;
+
+  notify_event = (XFixesCursorNotifyEvent *)xevent;
+  if (notify_event->subtype != XFixesDisplayCursorNotify)
+    return FALSE;
+
+  g_clear_object (&tracker_x11->xfixes_cursor);
+  meta_cursor_tracker_notify_cursor_changed (META_CURSOR_TRACKER (tracker_x11));
+
+  return TRUE;
+}
+
 static void
 update_position (MetaCursorTrackerX11 *tracker_x11)
 {
@@ -47,6 +75,20 @@ update_position (MetaCursorTrackerX11 *tracker_x11)
   meta_cursor_tracker_update_position (tracker, x, y);
 }
 
+static void
+ensure_xfixes_cursor (MetaCursorTrackerX11 *tracker_x11)
+{
+  MetaDisplay *display = meta_get_display ();
+  g_autoptr (GError) error = NULL;
+
+  if (tracker_x11->xfixes_cursor)
+    return;
+
+  tracker_x11->xfixes_cursor = meta_cursor_sprite_xfixes_new (display, &error);
+  if (!tracker_x11->xfixes_cursor)
+    g_warning ("Failed to create XFIXES cursor: %s", error->message);
+}
+
 static gboolean
 update_position_timeout (gpointer user_data)
 {
@@ -83,6 +125,18 @@ meta_cursor_tracker_x11_set_force_track_position (MetaCursorTracker *tracker,
     }
 }
 
+static MetaCursorSprite *
+meta_cursor_tracker_x11_get_sprite (MetaCursorTracker *tracker)
+{
+  MetaCursorTrackerX11 *tracker_x11 = META_CURSOR_TRACKER_X11 (tracker);
+
+  ensure_xfixes_cursor (META_CURSOR_TRACKER_X11 (tracker));
+  if (tracker_x11->xfixes_cursor)
+    return META_CURSOR_SPRITE (tracker_x11->xfixes_cursor);
+  else
+    return NULL;
+}
+
 static void
 meta_cursor_tracker_x11_dispose (GObject *object)
 {
@@ -108,4 +162,6 @@ meta_cursor_tracker_x11_class_init (MetaCursorTrackerX11Class *klass)
 
   tracker_class->set_force_track_position =
     meta_cursor_tracker_x11_set_force_track_position;
+  tracker_class->get_sprite =
+    meta_cursor_tracker_x11_get_sprite;
 }
diff --git a/src/backends/x11/meta-cursor-tracker-x11.h b/src/backends/x11/meta-cursor-tracker-x11.h
index 033c43b1a7..a4b4628443 100644
--- a/src/backends/x11/meta-cursor-tracker-x11.h
+++ b/src/backends/x11/meta-cursor-tracker-x11.h
@@ -28,4 +28,7 @@ G_DECLARE_FINAL_TYPE (MetaCursorTrackerX11, meta_cursor_tracker_x11,
                       META, CURSOR_TRACKER_X11,
                       MetaCursorTracker)
 
+gboolean meta_cursor_tracker_x11_handle_xevent (MetaCursorTrackerX11 *tracker_x11,
+                                                XEvent               *xevent);
+
 #endif /* META_CURSOR_TRACKER_X11_H */
diff --git a/src/x11/events.c b/src/x11/events.c
index f159f1db3b..8ca2fb9832 100644
--- a/src/x11/events.c
+++ b/src/x11/events.c
@@ -31,6 +31,7 @@
 
 #include "backends/meta-cursor-tracker-private.h"
 #include "backends/x11/meta-backend-x11.h"
+#include "backends/x11/meta-cursor-tracker-x11.h"
 #include "compositor/meta-compositor-x11.h"
 #include "cogl/cogl.h"
 #include "core/bell.h"
@@ -1829,10 +1830,16 @@ meta_x11_display_handle_xevent (MetaX11Display *x11_display,
   if (event->xany.window == x11_display->xroot)
     {
       cursor_tracker = meta_backend_get_cursor_tracker (backend);
-      if (meta_cursor_tracker_handle_xevent (cursor_tracker, event))
+      if (META_IS_CURSOR_TRACKER_X11 (cursor_tracker))
         {
-          bypass_gtk = bypass_compositor = TRUE;
-          goto out;
+          MetaCursorTrackerX11 *cursor_tracker_x11 =
+            META_CURSOR_TRACKER_X11 (cursor_tracker);
+
+          if (meta_cursor_tracker_x11_handle_xevent (cursor_tracker_x11, event))
+            {
+              bypass_gtk = bypass_compositor = TRUE;
+              goto out;
+            }
         }
     }