shell: Push the surface to the remote side

The receiver expects that the sender/transmitter will inform it when it
can create a surface and it can start the gstreamer pipeline.

The transmitter plug-in exposes a way to call that using 'push_surface'
callback. So, whenever we detect that the remote surface is to be
assigned to a waltham-type of output, we would need to call into this
'push_surface' callback. This acts as notification mechanism for the
remote side.

Bug-AGL: 3611

Signed-off-by: Marius Vlad <marius.vlad@collabora.com>
Change-Id: Ia5db0d8f2356708eaee3fbaabed2b3ba3ac97eb6

diff --git a/src/shell.c b/src/shell.c
index 4f70dfc..87d8ce9 100644 (file)
--- a/src/shell.c
+++ b/src/shell.c
@@ -42,6 +42,10 @@
 #include "agl-shell-server-protocol.h"
 #include "agl-shell-desktop-server-protocol.h"
 
+#ifdef HAVE_WALTHAM
+#include <waltham-transmitter/transmitter_api.h>
+#endif
+
 static void
 create_black_surface_view(struct ivi_output *output);
 
@@ -103,6 +107,61 @@ ivi_set_desktop_surface_fullscreen(struct ivi_surface *surface)
        agl_shell_desktop_advertise_application_id(ivi, surface);
 }
 
+static void
+ivi_output_notify_waltham_plugin(struct ivi_surface *surface)
+{
+       struct ivi_compositor *ivi = surface->ivi;
+       const struct weston_transmitter_api *api = ivi->waltham_transmitter_api;
+       struct weston_transmitter *transmitter;
+       struct weston_transmitter_remote *trans_remote;
+       struct weston_surface *weston_surface;
+       struct weston_output *woutput = surface->remote.output->output;
+       const char *app_id;
+
+       if (!api)
+               return;
+
+       transmitter = api->transmitter_get(ivi->compositor);
+       if (!transmitter)
+               return;
+
+       trans_remote = api->get_transmitter_remote(woutput->name, transmitter);
+       if (!trans_remote) {
+               weston_log("Could not find a valie weston_transmitter_remote "
+                               "that matches the output %s\n", woutput->name);
+               return;
+       }
+
+       app_id = weston_desktop_surface_get_app_id(surface->dsurface);
+       weston_surface =
+               weston_desktop_surface_get_surface(surface->dsurface);
+
+       weston_log("Forwarding app_id %s to remote %s\n", app_id, woutput->name);
+
+       /* this will have the effect of informing the remote side to create a
+        * surface with the name app_id. W/ xdg-shell the following happens:
+        *
+        * compositor (server):
+        * surface_push_to_remote():
+        *      waltham-transmitter plug-in
+        *              -> wthp_ivi_app_id_surface_create()
+        *
+        * client -- on the receiver side:
+        *      -> wthp_ivi_app_id_surface_create()
+        *              -> wth_receiver_weston_main()
+        *                      -> wl_compositor_create_surface()
+        *                      -> xdg_wm_base_get_xdg_surface
+        *                      -> xdg_toplevel_set_app_id()
+        *                      -> gst_init()
+        *                      -> gst_parse_launch()
+        *
+        * wth_receiver_weston_main() will be invoked from the handler of
+        * wthp_ivi_app_id_surface_create() and is responsible for setting-up
+        * the gstreamer pipeline as well.
+        */
+       api->surface_push_to_remote(weston_surface, app_id, trans_remote, NULL);
+}
+
 static void
 ivi_set_desktop_surface_remote(struct ivi_surface *surface)
 {
@@ -123,6 +182,9 @@ ivi_set_desktop_surface_remote(struct ivi_surface *surface)
        if (view->is_mapped || view->surface->is_mapped)
                remove_black_surface(output);
 
+       if (output->type == OUTPUT_WALTHAM)
+               ivi_output_notify_waltham_plugin(surface);
+
        wl_list_insert(&ivi->surfaces, &surface->link);
 }