wayland: Add support for wl_surface.damage_buffer

Summary:
damage_buffer posts damage in buffer co-ordinates instead of surface
co-ordinates.  For us currently these are always the same co-ordinate
spaces.  This will change when we start supporting viewports and
transforms.

Note: this is currently conditional on the macro
WL_SURFACE_DAMAGE_BUFFER_SINCE_VERSION which isn't in any
released wayland, but will be in the next.  We can remove
the ifdefs and change our wayland version dependency when
it's released

 #NefariousHiddenAgenda

Reviewers: zmike, devilhorns

Subscribers: cedric

Differential Revision: https://phab.enlightenment.org/D3468

src/bin/e_comp_wl.c

@@ -6,7 +6,12 @@
 #define __STDC_FORMAT_MACROS
 #include <inttypes.h>
 
-#define COMPOSITOR_VERSION 3
+/* When a wayland is released with this macro we can remove the ifdefs */
+#ifdef WL_SURFACE_DAMAGE_BUFFER_SINCE_VERSION
+# define COMPOSITOR_VERSION 4
+#else
+# define COMPOSITOR_VERSION 3
+#endif
 
 E_API int E_EVENT_WAYLAND_GLOBAL_ADD = -1;
 
@@ -1284,7 +1289,7 @@ _e_comp_wl_surface_cb_attach(struct wl_client *client EINA_UNUSED, struct wl_res
 }
 
 static void
-_e_comp_wl_surface_cb_damage(struct wl_client *client EINA_UNUSED, struct wl_resource *resource, int32_t x, int32_t y, int32_t w, int32_t h)
+_e_comp_wl_surface_cb_damage_buffer(struct wl_client *client EINA_UNUSED, struct wl_resource *resource, int32_t x, int32_t y, int32_t w, int32_t h)
 {
    E_Client *ec;
    Eina_Rectangle *dmg = NULL;
@@ -1298,6 +1303,17 @@ _e_comp_wl_surface_cb_damage(struct wl_client *client EINA_UNUSED, struct wl_res
      eina_list_append(ec->comp_data->pending.damages, dmg);
 }
 
+/*
+ * Currently damage and damage_buffer are the same because we don't support
+ * buffer_scale, transform, or viewport.  Once we support those we'll have
+ * to make surface_cb_damage handle damage in surface co-ordinates.
+ */
+static void
+_e_comp_wl_surface_cb_damage(struct wl_client *client, struct wl_resource *resource, int32_t x, int32_t y, int32_t w, int32_t h)
+{
+   _e_comp_wl_surface_cb_damage_buffer(client, resource, x, y, w, h);
+}
+
 static void
 _e_comp_wl_frame_cb_destroy(struct wl_resource *resource)
 {
@@ -1425,7 +1441,11 @@ static const struct wl_surface_interface _e_surface_interface =
    _e_comp_wl_surface_cb_input_region_set,
    _e_comp_wl_surface_cb_commit,
    _e_comp_wl_surface_cb_buffer_transform_set,
-   _e_comp_wl_surface_cb_buffer_scale_set
+   _e_comp_wl_surface_cb_buffer_scale_set,
+/* remove ifdefs once damage_buffer is officially released */
+#ifdef WL_SURFACE_DAMAGE_BUFFER_SINCE_VERSION
+   _e_comp_wl_surface_cb_damage_buffer
+#endif
 };
 
 static void