compositor: Added layout_save/layout_restore

In order to send correct dimensions after a hot-plug event, we need to
be able to save the area we had before.

Note that implies that the connectors do not change names in between
hot-plugs, which normally doesn't happen, but it might if udev rules are
executed/invoked. We restore based on output name it had previously.

Bug-AGL: SPEC-4705
Signed-off-by: Marius Vlad <marius.vlad@collabora.com>
Change-Id: Ice3a127edfc9d356830ba8f0d0a20bb86284d7de

3 files changed, 99 insertions, 0 deletions

diff --git a/src/compositor.c b/src/compositor.c
index b97ad79..60d5dd2 100644
--- a/src/compositor.c
+++ b/src/compositor.c
@@ -79,6 +79,95 @@ sigint_helper(int sig)
        raise(SIGUSR2);
 }
 
+void
+ivi_layout_save(struct ivi_compositor *ivi, struct ivi_output *output)
+{
+	struct ivi_output *new_output;
+	ivi->need_ivi_output_relayout = true;
+
+	new_output = zalloc(sizeof(*new_output));
+
+	new_output->ivi = ivi;
+	new_output->background = output->background;
+
+	new_output->top = output->top;
+	new_output->bottom = output->bottom;
+	new_output->left = output->left;
+	new_output->right = output->right;
+
+	new_output->active = output->active;
+	new_output->previous_active = output->previous_active;
+	new_output->name = strdup(output->name);
+	if (output->app_ids)
+		new_output->app_ids = strdup(output->app_ids);
+
+	new_output->area = output->area;
+	new_output->area_saved = output->area_saved;
+	new_output->area_activation = output->area_activation;
+
+	weston_log("saving output layout for output %s\n", new_output->name);
+
+	wl_list_insert(&ivi->saved_outputs, &new_output->link);
+}
+
+void
+ivi_layout_restore(struct ivi_compositor *ivi, struct ivi_output *n_output)
+{
+	struct ivi_output *output = NULL;
+	struct ivi_output *iter_output;
+
+	if (!ivi->need_ivi_output_relayout)
+		return;
+
+	ivi->need_ivi_output_relayout = false;
+
+	wl_list_for_each(iter_output, &ivi->saved_outputs, link) {
+		if (strcmp(n_output->name, iter_output->name) == 0) {
+			output = iter_output;
+			break;
+		}
+	}
+
+	if (!output)
+		return;
+
+	weston_log("restoring output layout for output %s\n", output->name);
+	n_output->background = output->background;
+
+	n_output->top = output->top;
+	n_output->bottom = output->bottom;
+	n_output->left = output->left;
+	n_output->right = output->right;
+
+	n_output->active = output->active;
+	n_output->previous_active = output->previous_active;
+	if (output->app_ids)
+		n_output->app_ids = strdup(output->app_ids);
+
+	n_output->area = output->area;
+	n_output->area_saved = output->area_saved;
+	n_output->area_activation = output->area_activation;
+
+	free(output->app_ids);
+	free(output->name);
+	wl_list_remove(&output->link);
+	free(output);
+}
+
+void
+ivi_layout_destroy_saved_outputs(struct ivi_compositor *ivi)
+{
+	struct ivi_output *output, *output_next;
+
+	wl_list_for_each_safe(output, output_next, &ivi->saved_outputs, link) {
+		free(output->app_ids);
+		free(output->name);
+
+		wl_list_remove(&output->link);
+		free(output);
+	}
+}
+
 static void
 handle_output_destroy(struct wl_listener *listener, void *data)
 {
@@ -93,6 +182,8 @@ handle_output_destroy(struct wl_listener *listener, void *data)
 		output->fullscreen_view.fs->view = NULL;
 	}
 
+	ivi_layout_save(output->ivi, output);
+
 	output->output = NULL;
 	wl_list_remove(&output->output_destroy.link);
 }
@@ -454,6 +545,8 @@ try_attach_enable_heads(struct ivi_output *output)
 	for (size_t i = fail_len; i < output->add_len; ++i)
 		add_head_destroyed_listener(output->add[i]);
 
+	ivi_layout_restore(output->ivi, output);
+
 	output->add_len = fail_len;
 	return 0;
 }
@@ -1688,6 +1781,7 @@ int wet_main(int argc, char *argv[], const struct weston_testsuite_data *test_da
 	};
 
 	wl_list_init(&ivi.outputs);
+	wl_list_init(&ivi.saved_outputs);
 	wl_list_init(&ivi.surfaces);
 	wl_list_init(&ivi.pending_surfaces);
 	wl_list_init(&ivi.popup_pending_apps);
diff --git a/src/desktop.c b/src/desktop.c
index 0f1da18..eb0dc8a 100644
--- a/src/desktop.c
+++ b/src/desktop.c
@@ -531,6 +531,7 @@ ivi_shell_destroy(struct wl_listener *listener, void *data)
 
 	ivi_shell_finalize(ivi);
 	ivi_compositor_destroy_pending_surfaces(ivi);
+	ivi_layout_destroy_saved_outputs(ivi);
 
 	weston_desktop_destroy(ivi->desktop);
 	wl_list_remove(&listener->link);
diff --git a/src/ivi-compositor.h b/src/ivi-compositor.h
index 0ccbb52..ed56c7f 100644
--- a/src/ivi-compositor.h
+++ b/src/ivi-compositor.h
@@ -104,6 +104,7 @@ struct ivi_compositor {
 	struct wl_list desktop_clients;	/* desktop_client::link */
 
 	struct wl_list outputs; /* ivi_output.link */
+	struct wl_list saved_outputs; /* ivi_output.link */
 	struct wl_list surfaces; /* ivi_surface.link */
 
 	struct weston_desktop *desktop;
@@ -125,6 +126,7 @@ struct ivi_compositor {
 	struct weston_layer popup;
 	struct weston_layer fullscreen;
 
+	bool need_ivi_output_relayout;
 	struct wl_list child_process_list;
 };
 
@@ -502,5 +504,7 @@ sigchld_handler(int signal_number, void *data);
 void
 shell_send_app_state(struct ivi_compositor *ivi, const char *app_id,
 		     enum agl_shell_app_state state);
+void
+ivi_layout_destroy_saved_outputs(struct ivi_compositor *ivi);
 
 #endif