[PATCH wayland] protocol: make pointer images regular surfaces

[Ander Conselvan de Oliveira]

Replace the input_device.attach request with a request for setting a
pointer surface. Also add a new interface, wl_pointer_surface, that
provides a request for setting the hotspot of a pointer surface.
With this change, clients should be able to request frame callbacks
for pointer surfaces in order to implement animated cursors.
---
 protocol/wayland.xml |   45 ++++++++++++++++++++++++++++++++++++---------
 1 files changed, 36 insertions(+), 9 deletions(-)

diff --git a/protocol/wayland.xml b/protocol/wayland.xml
index 5118b5b..935173a 100644
--- a/protocol/wayland.xml
+++ b/protocol/wayland.xml
@@ -612,6 +612,28 @@
     </request>
   </interface>
 
+  <interface name="wl_pointer_surface" version="1">
+    <description summary="special interface for pointer surfaces">
+      An interface implemented by wl_surface that is used as a pointer
+      surface. This object is automatically destroyed if the wl_surface
+      used to create it is destroyed.
+
+      The input region of a wl_surface implementing this interface is
+      always empty.
+    </description>
+
+    <request name="set_hotspot">
+      <description summary="change the hotspot">
+	Set the hotspot of a pointer surface. When the pointer surface
+	is mapped, its top-left corner position will be the current
+	pointer position minus the vector (x, y).
+      </description>
+
+      <arg name="x" type="int"/>
+      <arg name="y" type="int"/>
+    </request>
+  </interface>
+
   <interface name="wl_input_device" version="1">
     <description summary="input device group">
       A group of keyboards and pointer devices (mice, for
@@ -621,17 +643,22 @@
       pointer_focus.
     </description>
 
-    <request name="attach">
-      <description summary="set the pointer image">
-	Set the pointer's image.  This request only takes effect if
-	the pointer focus for this device is one of the requesting
-	clients surfaces.
+    <request name="set_pointer_surface">
+      <description summary="set the surface containing the pointer image">
+	Set the supplied client surface as the pointer surface for the
+	requesting client. When the pointer focus is on one of the
+	requesting clients surfaces, this pointer surface will be
+	displayed at the cursor location, offset by a hotspot that
+	may be set with the wl_pointer_surface::set_hotspot request.
+
+	Returns a newly created wl_pointer_surface object. If there was
+	a previous pointer surface set by the client, the wl_pointer_surface
+	object associated with it is destroyed. Parameter surface must be
+	non-nil.
       </description>
 
-      <arg name="time" type="uint"/>
-      <arg name="buffer" type="object" interface="wl_buffer"/>
-      <arg name="hotspot_x" type="int"/>
-      <arg name="hotspot_y" type="int"/>
+      <arg name="surface" type="object" interface="wl_surface"/>
+      <arg name="id" type="new_id" interface="wl_pointer_surface"/>
     </request>
 
     <event name="motion">
-- 
1.7.4.1