protocol: add interface ivi_application extension

- introduces ivi-application.xml

Many applications in an IVI-system are special single-purpose
applications that have a very specific role in the whole IVI UI, for
example a rear camera, speedometer, map, etc. The IVI system vendor
specifies what these are and how they integrate into the UI. They also
vary between particular IVI systems. This is why we use (system-)global,
unique, pre-determined ID numbers to tell what wl_surface is which
application, instead of writing specific shell requests for each one.
Using ID numbers allows vendors to easily invent new component
applications without extending or breaking the actual Wayland protocol.
In IVI-systems, the ID is a standard concept already used in several
APIs, with a vendor-specified global definition of ID assignments.

Signed-off-by: Nobuhiko Tanibata <NOBUHIKO_TANIBATA@xddp.denso.co.jp>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>

Makefile.am

@@ -445,7 +445,9 @@ nodist_libtoytoolkit_la_SOURCES =			\
 	protocol/presentation_timing-protocol.c		\
 	protocol/presentation_timing-client-protocol.h	\
 	protocol/xdg-shell-protocol.c			\
-	protocol/xdg-shell-client-protocol.h
+	protocol/xdg-shell-client-protocol.h		\
+	protocol/ivi-application-protocol.c		\
+	protocol/ivi-application-client-protocol.h
 
 BUILT_SOURCES += $(nodist_libtoytoolkit_la_SOURCES)
 
@@ -1003,7 +1005,8 @@ EXTRA_DIST +=					\
 	protocol/xdg-shell.xml			\
 	protocol/fullscreen-shell.xml		\
 	protocol/presentation_timing.xml	\
-	protocol/scaler.xml
+	protocol/scaler.xml			\
+	protocol/ivi-application.xml
 
 man_MANS = weston.1 weston.ini.5
 

protocol/ivi-application.xml

@@ -0,0 +1,99 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<protocol name="ivi_application">
+
+  <copyright>
+    Copyright (C) 2013 DENSO CORPORATION
+    Copyright (c) 2013 BMW Car IT GmbH
+
+    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.
+  </copyright>
+
+  <interface name="ivi_surface" version="1">
+    <description summary="application interface to surface in ivi compositor"/>
+
+    <request name="destroy" type="destructor">
+      <description summary="destroy ivi_surface">
+        This removes link from ivi_id to wl_surface and destroys ivi_surface.
+        The ID, ivi_id, is free and can be used for surface_create again.
+      </description>
+    </request>
+
+    <event name="configure">
+      <description summary="suggest resize">
+        The configure event asks the client to resize its surface.
+
+        The size is a hint, in the sense that the client is free to
+        ignore it if it doesn't resize, pick a smaller size (to
+        satisfy aspect ratio or resize in steps of NxM pixels).
+
+        The client is free to dismiss all but the last configure
+        event it received.
+
+        The width and height arguments specify the size of the window
+        in surface local coordinates.
+      </description>
+      <arg name="width" type="int"/>
+      <arg name="height" type="int"/>
+    </event>
+  </interface>
+
+  <interface name="ivi_application" version="1">
+    <description summary="create ivi-style surfaces">
+      This interface is exposed as a global singleton.
+      This interface is implemented by servers that provide IVI-style user interfaces.
+      It allows clients to associate a ivi_surface with wl_surface.
+    </description>
+
+    <enum name="error">
+      <entry name="role" value="0" summary="given wl_surface has another role"/>
+      <entry name="ivi_id" value="1" summary="given ivi_id is assigned to another wl_surface"/>
+    </enum>
+
+    <request name="surface_create">
+      <description summary="create ivi_surface with numeric ID in ivi compositor">
+        This request gives the wl_surface the role of an IVI Surface. Creating more than
+        one ivi_surface for a wl_surface is not allowed. Note, that this still allows the
+        following example:
+
+         1. create a wl_surface
+         2. create ivi_surface for the wl_surface
+         3. destroy the ivi_surface
+         4. create ivi_surface for the wl_surface (with the same or another ivi_id as before)
+
+        surface_create will create a interface:ivi_surface with numeric ID; ivi_id in
+        ivi compositor. These ivi_ids are defined as unique in the system to identify
+        it inside of ivi compositor. The ivi compositor implements business logic how to
+        set properties of the surface with ivi_id according to status of the system.
+        E.g. a unique ID for Car Navigation application is used for implementing special
+        logic of the application about where it shall be located.
+        The server regards following cases as protocol errors and disconnects the client.
+         - wl_surface already has an nother role.
+         - ivi_id is already assigned to an another wl_surface.
+
+        If client destroys ivi_surface or wl_surface which is assigne to the ivi_surface,
+        ivi_id which is assigned to the ivi_surface is free for reuse.
+      </description>
+      <arg name="ivi_id" type="uint"/>
+      <arg name="surface" type="object" interface="wl_surface"/>
+      <arg name="id" type="new_id" interface="ivi_surface"/>
+    </request>
+
+  </interface>
+
+</protocol>