6 files changed, 219 insertions, 0 deletions

diff --git a/include/wlr/types/wlr_output_layout.h b/include/wlr/types/wlr_output_layout.h
index 3c150fc0..f2f6e44b 100644
--- a/include/wlr/types/wlr_output_layout.h
+++ b/include/wlr/types/wlr_output_layout.h
@@ -32,6 +32,11 @@ struct wlr_output_layout_output {
 	} events;
 };
 
+/**
+ * Creates a wlr_output_layout, which can be used to describing outputs in
+ * physical space relative to one another, and perform various useful operations
+ * on that state.
+ */
 struct wlr_output_layout *wlr_output_layout_create();
 
 void wlr_output_layout_destroy(struct wlr_output_layout *layout);
diff --git a/include/wlr/types/wlr_xdg_output.h b/include/wlr/types/wlr_xdg_output.h
new file mode 100644
index 00000000..27dad2b8
--- /dev/null
+++ b/include/wlr/types/wlr_xdg_output.h
@@ -0,0 +1,32 @@
+#ifndef WLR_TYPES_WLR_XDG_OUTPUT_H
+#define WLR_TYPES_WLR_XDG_OUTPUT_H
+#include <wayland-server.h>
+#include <wlr/types/wlr_output_layout.h>
+
+struct wlr_xdg_output {
+	struct wl_list link;
+	struct wl_list resources;
+
+	struct wlr_xdg_output_manager *manager;
+	struct wlr_output_layout_output *layout_output;
+
+	struct wl_listener destroy;
+};
+
+struct wlr_xdg_output_manager {
+	struct wl_global *global;
+
+	struct wlr_output_layout *layout;
+
+	struct wl_list outputs;
+
+	struct wl_listener layout_add;
+	struct wl_listener layout_change;
+	struct wl_listener layout_destroy;
+};
+
+struct wlr_xdg_output_manager *wlr_xdg_output_manager_create(
+		struct wl_display *display, struct wlr_output_layout *layout);
+void wlr_xdg_output_manager_destroy(struct wlr_xdg_output_manager *manager);
+
+#endif
diff --git a/protocol/meson.build b/protocol/meson.build
index b88b4b77..bdbde96a 100644
--- a/protocol/meson.build
+++ b/protocol/meson.build
@@ -25,6 +25,7 @@ protocols = [
 	[wl_protocol_dir, 'unstable/idle-inhibit/idle-inhibit-unstable-v1.xml'],
 	[wl_protocol_dir, 'unstable/linux-dmabuf/linux-dmabuf-unstable-v1.xml'],
 	[wl_protocol_dir, 'unstable/xdg-shell/xdg-shell-unstable-v6.xml'],
+	[wl_protocol_dir, 'unstable/xdg-output/xdg-output-unstable-v1.xml'],
 	'gamma-control.xml',
 	'gtk-primary-selection.xml',
 	'idle.xml',
diff --git a/rootston/desktop.c b/rootston/desktop.c
index e9c1ed30..07b80b08 100644
--- a/rootston/desktop.c
+++ b/rootston/desktop.c
@@ -20,6 +20,7 @@
 #include <wlr/types/wlr_xcursor_manager.h>
 #include <wlr/types/wlr_xdg_shell_v6.h>
 #include <wlr/types/wlr_xdg_shell.h>
+#include <wlr/types/wlr_xdg_output.h>
 #include <wlr/util/log.h>
 #include "rootston/layers.h"
 #include "rootston/seat.h"
@@ -775,6 +776,7 @@ struct roots_desktop *desktop_create(struct roots_server *server,
 	desktop->config = config;
 
 	desktop->layout = wlr_output_layout_create();
+	wlr_xdg_output_manager_create(server->wl_display, desktop->layout);
 	desktop->layout_change.notify = handle_layout_change;
 	wl_signal_add(&desktop->layout->events.change, &desktop->layout_change);
 
diff --git a/types/meson.build b/types/meson.build
index eda5f4e4..7e089d03 100644
--- a/types/meson.build
+++ b/types/meson.build
@@ -33,6 +33,7 @@ lib_wlr_types = static_library(
 		'wlr_xcursor_manager.c',
 		'wlr_xdg_shell_v6.c',
 		'wlr_xdg_shell.c',
+		'wlr_xdg_output.c',
 	),
 	include_directories: wlr_inc,
 	dependencies: [pixman, xkbcommon, wayland_server, wlr_protos],
diff --git a/types/wlr_xdg_output.c b/types/wlr_xdg_output.c
new file mode 100644
index 00000000..91c86b2f
--- /dev/null
+++ b/types/wlr_xdg_output.c
@@ -0,0 +1,178 @@
+#include <assert.h>
+#include <stdlib.h>
+#include <wlr/types/wlr_output_layout.h>
+#include <wlr/types/wlr_output.h>
+#include <wlr/types/wlr_xdg_output.h>
+#include <wlr/util/log.h>
+#include "xdg-output-unstable-v1-protocol.h"
+
+static void xdg_output_destroy(struct wl_client *client,
+		struct wl_resource *resource) {
+	wl_resource_destroy(resource);
+}
+
+static const struct zxdg_output_v1_interface xdg_output_implementation = {
+	.destroy = xdg_output_destroy,
+};
+
+static void xdg_output_manager_destroy(struct wl_client *client,
+		struct wl_resource *resource) {
+	wl_resource_destroy(resource);
+}
+
+static const struct zxdg_output_manager_v1_interface xdg_output_manager_implementation;
+
+static void xdg_output_send_details(struct wl_resource *resource,
+		struct wlr_output_layout_output *layout_output) {
+	zxdg_output_v1_send_logical_position(resource,
+			layout_output->x, layout_output->y);
+	zxdg_output_v1_send_logical_size(resource,
+			(float)layout_output->output->width / layout_output->output->scale,
+			(float)layout_output->output->height / layout_output->output->scale);
+	zxdg_output_v1_send_done(resource);
+}
+
+static void xdg_output_manager_get_xdg_output(struct wl_client *client,
+		struct wl_resource *resource, uint32_t id, struct wl_resource *output) {
+	assert(wl_resource_instance_of(resource, &zxdg_output_manager_v1_interface,
+			&xdg_output_manager_implementation));
+
+	struct wlr_xdg_output_manager *manager =
+		wl_resource_get_user_data(resource);
+	struct wlr_output_layout *layout = manager->layout;
+	struct wlr_output *wlr_output = wlr_output_from_resource(output);
+
+	struct wlr_output_layout_output *layout_output =
+		wlr_output_layout_get(layout, wlr_output);
+	assert(layout_output);
+
+	struct wl_resource *output_resource = wl_resource_create(client,
+			&zxdg_output_v1_interface, wl_resource_get_version(resource), id);
+	if (!output_resource) {
+		wl_client_post_no_memory(client);
+		return;
+	}
+	wl_resource_set_implementation(output_resource,
+			&xdg_output_implementation, NULL, NULL);
+	xdg_output_send_details(output_resource, layout_output);
+}
+
+static const struct zxdg_output_manager_v1_interface xdg_output_manager_implementation = {
+	.destroy = xdg_output_manager_destroy,
+	.get_xdg_output = xdg_output_manager_get_xdg_output,
+};
+
+static void output_manager_bind(struct wl_client *wl_client, void *data,
+		uint32_t version, uint32_t id) {
+	struct wlr_xdg_output_manager *manager = data;
+	assert(wl_client && manager);
+
+	struct wl_resource *wl_resource = wl_resource_create(wl_client,
+		&zxdg_output_manager_v1_interface, version, id);
+	if (wl_resource == NULL) {
+		wl_client_post_no_memory(wl_client);
+		return;
+	}
+	wl_resource_set_implementation(wl_resource,
+			&xdg_output_manager_implementation, manager, NULL);
+}
+
+static void destroy_output(struct wlr_xdg_output *output) {
+	struct wl_resource *resource, *tmp;
+	wl_resource_for_each_safe(resource, tmp, &output->resources) {
+		wl_list_remove(wl_resource_get_link(resource));
+		wl_list_init(wl_resource_get_link(resource));
+	}
+	wl_list_remove(&output->destroy.link);
+	wl_list_remove(&output->link);
+	free(output);
+}
+
+static void handle_output_destroy(struct wl_listener *listener, void *data) {
+	struct wlr_xdg_output *output = wl_container_of(listener, output, destroy);
+	destroy_output(output);
+}
+
+static void add_output(struct wlr_xdg_output_manager *manager,
+		struct wlr_output_layout_output *layout_output) {
+	struct wlr_xdg_output *output = calloc(1, sizeof(struct wlr_xdg_output));
+	wl_list_init(&output->resources);
+	output->manager = manager;
+	output->layout_output = layout_output;
+	output->destroy.notify = handle_output_destroy;
+	wl_signal_add(&layout_output->events.destroy, &output->destroy);
+	wl_list_insert(&manager->outputs, &output->link);
+}
+
+static void xdg_output_manager_send_details(
+		struct wlr_xdg_output_manager *manager) {
+	struct wlr_xdg_output *output;
+	wl_list_for_each(output, &manager->outputs, link) {
+		struct wl_resource *resource;
+		wl_resource_for_each(resource, &output->resources) {
+			xdg_output_send_details(resource, output->layout_output);
+		}
+	}
+}
+
+static void handle_layout_add(struct wl_listener *listener, void *data) {
+	struct wlr_xdg_output_manager *manager =
+		wl_container_of(listener, manager, layout_add);
+	struct wlr_output_layout_output *layout_output = data;
+	add_output(manager, layout_output);
+}
+
+static void handle_layout_change(struct wl_listener *listener, void *data) {
+	struct wlr_xdg_output_manager *manager =
+		wl_container_of(listener, manager, layout_change);
+	xdg_output_manager_send_details(manager);
+}
+
+static void handle_layout_destroy(struct wl_listener *listener, void *data) {
+	struct wlr_xdg_output_manager *manager =
+		wl_container_of(listener, manager, layout_change);
+	wlr_xdg_output_manager_destroy(manager);
+}
+
+struct wlr_xdg_output_manager *wlr_xdg_output_manager_create(
+		struct wl_display *display, struct wlr_output_layout *layout) {
+	assert(display && layout);
+	struct wlr_xdg_output_manager *manager =
+		calloc(1, sizeof(struct wlr_xdg_output_manager));
+	if (manager == NULL) {
+		return NULL;
+	}
+	manager->layout = layout;
+	manager->global = wl_global_create(display,
+			&zxdg_output_manager_v1_interface,
+			1, manager, output_manager_bind);
+	if (!manager->global) {
+		free(manager);
+		return NULL;
+	}
+
+	wl_list_init(&manager->outputs);
+	struct wlr_output_layout_output *layout_output;
+	wl_list_for_each(layout_output, &layout->outputs, link) {
+		add_output(manager, layout_output);
+	}
+
+	manager->layout_add.notify = handle_layout_add;
+	wl_signal_add(&layout->events.add, &manager->layout_add);
+	manager->layout_change.notify = handle_layout_change;
+	wl_signal_add(&layout->events.change, &manager->layout_change);
+	manager->layout_destroy.notify = handle_layout_destroy;
+	wl_signal_add(&layout->events.destroy, &manager->layout_destroy);
+	return manager;
+}
+
+void wlr_xdg_output_manager_destroy(struct wlr_xdg_output_manager *manager) {
+	struct wlr_xdg_output *output, *tmp;
+	wl_list_for_each_safe(output, tmp, &manager->outputs, link) {
+		destroy_output(output);
+	}
+	wl_list_remove(&manager->layout_add.link);
+	wl_list_remove(&manager->layout_change.link);
+	wl_list_remove(&manager->layout_destroy.link);
+	free(manager);
+}