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

1 files changed, 62 insertions, 0 deletions

diff --git a/src/shell.c b/src/shell.c
index 4f70dfc..87d8ce9 100644
--- 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);
 
@@ -104,6 +108,61 @@ ivi_set_desktop_surface_fullscreen(struct ivi_surface *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)
 {
 	struct ivi_compositor *ivi = surface->ivi;
@@ -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);
 }