subcompositor: split out from compositor

include/wlr/types/wlr_compositor.h

@@ -14,16 +14,10 @@
 
 struct wlr_surface;
 
-struct wlr_subcompositor {
-	struct wl_global *global;
-};
-
 struct wlr_compositor {
 	struct wl_global *global;
 	struct wlr_renderer *renderer;
 
-	struct wlr_subcompositor subcompositor;
-
 	struct wl_listener display_destroy;
 
 	struct {
@@ -35,13 +29,4 @@ struct wlr_compositor {
 struct wlr_compositor *wlr_compositor_create(struct wl_display *display,
 	struct wlr_renderer *renderer);
 
-bool wlr_surface_is_subsurface(struct wlr_surface *surface);
-
-/**
- * Get a subsurface from a surface. Can return NULL if the subsurface has been
- * destroyed.
- */
-struct wlr_subsurface *wlr_subsurface_from_wlr_surface(
-	struct wlr_surface *surface);
-
 #endif

include/wlr/types/wlr_subcompositor.h

@@ -0,0 +1,37 @@
+/*
+ * This an unstable interface of wlroots. No guarantees are made regarding the
+ * future consistency of this API.
+ */
+#ifndef WLR_USE_UNSTABLE
+#error "Add -DWLR_USE_UNSTABLE to enable unstable wlroots features"
+#endif
+
+#ifndef WLR_TYPES_WLR_SUBCOMPOSITOR_H
+#define WLR_TYPES_WLR_SUBCOMPOSITOR_H
+
+#include <wayland-server-core.h>
+
+struct wlr_surface;
+
+struct wlr_subcompositor {
+	struct wl_global *global;
+
+	struct wl_listener display_destroy;
+
+	struct {
+		struct wl_signal destroy;
+	} events;
+};
+
+bool wlr_surface_is_subsurface(struct wlr_surface *surface);
+
+/**
+ * Get a subsurface from a surface. Can return NULL if the subsurface has been
+ * destroyed.
+ */
+struct wlr_subsurface *wlr_subsurface_from_wlr_surface(
+	struct wlr_surface *surface);
+
+struct wlr_subcompositor *wlr_subcompositor_create(struct wl_display *display);
+
+#endif

tinywl/tinywl.c

@@ -20,6 +20,7 @@
 #include <wlr/types/wlr_pointer.h>
 #include <wlr/types/wlr_scene.h>
 #include <wlr/types/wlr_seat.h>
+#include <wlr/types/wlr_subcompositor.h>
 #include <wlr/types/wlr_xcursor_manager.h>
 #include <wlr/types/wlr_xdg_shell.h>
 #include <wlr/util/log.h>
@@ -756,12 +757,14 @@ int main(int argc, char *argv[]) {
 		server.renderer);
 
 	/* This creates some hands-off wlroots interfaces. The compositor is
-	 * necessary for clients to allocate surfaces and the data device manager
+	 * necessary for clients to allocate surfaces, the subcompositor allows to
+	 * assign the role of subsurfaces to surfaces and the data device manager
 	 * handles the clipboard. Each of these wlroots interfaces has room for you
 	 * to dig your fingers in and play with their behavior if you want. Note that
 	 * the clients cannot set the selection directly without compositor approval,
 	 * see the handling of the request_set_selection event below.*/
 	wlr_compositor_create(server.wl_display, server.renderer);
+	wlr_subcompositor_create(server.wl_display);
 	wlr_data_device_manager_create(server.wl_display);
 
 	/* Creates an output layout, which a wlroots utility for working with an

types/meson.build

@@ -58,6 +58,7 @@ wlr_files += files(
 	'wlr_relative_pointer_v1.c',
 	'wlr_screencopy_v1.c',
 	'wlr_server_decoration.c',
+	'wlr_subcompositor.c',
 	'wlr_surface.c',
 	'wlr_switch.c',
 	'wlr_tablet_pad.c',

types/wlr_compositor.c

@@ -3,108 +3,11 @@
 #include <wayland-server-core.h>
 #include <wlr/types/wlr_compositor.h>
 #include <wlr/types/wlr_surface.h>
-#include <wlr/util/log.h>
 #include "types/wlr_region.h"
 #include "types/wlr_surface.h"
 #include "util/signal.h"
 
 #define COMPOSITOR_VERSION 4
-#define SUBCOMPOSITOR_VERSION 1
-
-extern const struct wlr_surface_role subsurface_role;
-
-bool wlr_surface_is_subsurface(struct wlr_surface *surface) {
-	return surface->role == &subsurface_role;
-}
-
-struct wlr_subsurface *wlr_subsurface_from_wlr_surface(
-		struct wlr_surface *surface) {
-	assert(wlr_surface_is_subsurface(surface));
-	return (struct wlr_subsurface *)surface->role_data;
-}
-
-static void subcompositor_handle_destroy(struct wl_client *client,
-		struct wl_resource *resource) {
-	wl_resource_destroy(resource);
-}
-
-static void subcompositor_handle_get_subsurface(struct wl_client *client,
-		struct wl_resource *resource, uint32_t id,
-		struct wl_resource *surface_resource,
-		struct wl_resource *parent_resource) {
-	struct wlr_surface *surface = wlr_surface_from_resource(surface_resource);
-	struct wlr_surface *parent = wlr_surface_from_resource(parent_resource);
-
-	static const char msg[] = "get_subsurface: wl_subsurface@";
-
-	if (surface == parent) {
-		wl_resource_post_error(resource,
-			WL_SUBCOMPOSITOR_ERROR_BAD_SURFACE,
-			"%s%" PRIu32 ": wl_surface@%" PRIu32 " cannot be its own parent",
-			msg, id, wl_resource_get_id(surface_resource));
-		return;
-	}
-
-	if (wlr_surface_is_subsurface(surface) &&
-			wlr_subsurface_from_wlr_surface(surface) != NULL) {
-		wl_resource_post_error(resource,
-			WL_SUBCOMPOSITOR_ERROR_BAD_SURFACE,
-			"%s%" PRIu32 ": wl_surface@%" PRIu32 " is already a sub-surface",
-			msg, id, wl_resource_get_id(surface_resource));
-		return;
-	}
-
-	if (wlr_surface_get_root_surface(parent) == surface) {
-		wl_resource_post_error(resource,
-			WL_SUBCOMPOSITOR_ERROR_BAD_SURFACE,
-			"%s%" PRIu32 ": wl_surface@%" PRIu32 " is an ancestor of parent",
-			msg, id, wl_resource_get_id(surface_resource));
-		return;
-	}
-
-	if (!wlr_surface_set_role(surface, &subsurface_role, NULL,
-			resource, WL_SUBCOMPOSITOR_ERROR_BAD_SURFACE)) {
-		return;
-	}
-
-	subsurface_create(surface, parent, wl_resource_get_version(resource), id);
-}
-
-static const struct wl_subcompositor_interface subcompositor_impl = {
-	.destroy = subcompositor_handle_destroy,
-	.get_subsurface = subcompositor_handle_get_subsurface,
-};
-
-static void subcompositor_bind(struct wl_client *client, void *data,
-		uint32_t version, uint32_t id) {
-	struct wlr_subcompositor *subcompositor = data;
-	struct wl_resource *resource =
-		wl_resource_create(client, &wl_subcompositor_interface, 1, id);
-	if (resource == NULL) {
-		wl_client_post_no_memory(client);
-		return;
-	}
-	wl_resource_set_implementation(resource, &subcompositor_impl,
-		subcompositor, NULL);
-}
-
-static bool subcompositor_init(struct wlr_subcompositor *subcompositor,
-		struct wl_display *display) {
-	subcompositor->global = wl_global_create(display,
-		&wl_subcompositor_interface, SUBCOMPOSITOR_VERSION, subcompositor,
-		subcompositor_bind);
-	if (subcompositor->global == NULL) {
-		wlr_log_errno(WLR_ERROR, "Could not allocate subcompositor global");
-		return false;
-	}
-
-	return true;
-}
-
-static void subcompositor_finish(struct wlr_subcompositor *subcompositor) {
-	wl_global_destroy(subcompositor->global);
-}
-
 
 static const struct wl_compositor_interface compositor_impl;
 
@@ -152,11 +55,11 @@ static void compositor_bind(struct wl_client *wl_client, void *data,
 	wl_resource_set_implementation(resource, &compositor_impl, compositor, NULL);
 }
 
-static void handle_display_destroy(struct wl_listener *listener, void *data) {
+static void compositor_handle_display_destroy(
+		struct wl_listener *listener, void *data) {
 	struct wlr_compositor *compositor =
 		wl_container_of(listener, compositor, display_destroy);
-	wlr_signal_emit_safe(&compositor->events.destroy, compositor);
-	subcompositor_finish(&compositor->subcompositor);
+	wlr_signal_emit_safe(&compositor->events.destroy, NULL);
 	wl_list_remove(&compositor->display_destroy.link);
 	wl_global_destroy(compositor->global);
 	free(compositor);
@@ -164,10 +67,8 @@ static void handle_display_destroy(struct wl_listener *listener, void *data) {
 
 struct wlr_compositor *wlr_compositor_create(struct wl_display *display,
 		struct wlr_renderer *renderer) {
-	struct wlr_compositor *compositor =
-		calloc(1, sizeof(struct wlr_compositor));
+	struct wlr_compositor *compositor = calloc(1, sizeof(*compositor));
 	if (!compositor) {
-		wlr_log_errno(WLR_ERROR, "Could not allocate wlr compositor");
 		return NULL;
 	}
 
@@ -175,7 +76,6 @@ struct wlr_compositor *wlr_compositor_create(struct wl_display *display,
 		COMPOSITOR_VERSION, compositor, compositor_bind);
 	if (!compositor->global) {
 		free(compositor);
-		wlr_log_errno(WLR_ERROR, "Could not allocate compositor global");
 		return NULL;
 	}
 	compositor->renderer = renderer;
@@ -183,9 +83,7 @@ struct wlr_compositor *wlr_compositor_create(struct wl_display *display,
 	wl_signal_init(&compositor->events.new_surface);
 	wl_signal_init(&compositor->events.destroy);
 
-	subcompositor_init(&compositor->subcompositor, display);
-
-	compositor->display_destroy.notify = handle_display_destroy;
+	compositor->display_destroy.notify = compositor_handle_display_destroy;
 	wl_display_add_destroy_listener(display, &compositor->display_destroy);
 
 	return compositor;

types/wlr_subcompositor.c

@@ -0,0 +1,120 @@
+#include <assert.h>
+#include <stdlib.h>
+#include <wayland-server-core.h>
+#include <wlr/types/wlr_subcompositor.h>
+#include <wlr/types/wlr_surface.h>
+#include "types/wlr_region.h"
+#include "types/wlr_surface.h"
+#include "util/signal.h"
+
+#define SUBCOMPOSITOR_VERSION 1
+
+extern const struct wlr_surface_role subsurface_role;
+
+bool wlr_surface_is_subsurface(struct wlr_surface *surface) {
+	return surface->role == &subsurface_role;
+}
+
+struct wlr_subsurface *wlr_subsurface_from_wlr_surface(
+		struct wlr_surface *surface) {
+	assert(wlr_surface_is_subsurface(surface));
+	return (struct wlr_subsurface *)surface->role_data;
+}
+
+static void subcompositor_handle_destroy(struct wl_client *client,
+		struct wl_resource *resource) {
+	wl_resource_destroy(resource);
+}
+
+static void subcompositor_handle_get_subsurface(struct wl_client *client,
+		struct wl_resource *resource, uint32_t id,
+		struct wl_resource *surface_resource,
+		struct wl_resource *parent_resource) {
+	struct wlr_surface *surface = wlr_surface_from_resource(surface_resource);
+	struct wlr_surface *parent = wlr_surface_from_resource(parent_resource);
+
+	static const char msg[] = "get_subsurface: wl_subsurface@";
+
+	if (surface == parent) {
+		wl_resource_post_error(resource,
+			WL_SUBCOMPOSITOR_ERROR_BAD_SURFACE,
+			"%s%" PRIu32 ": wl_surface@%" PRIu32 " cannot be its own parent",
+			msg, id, wl_resource_get_id(surface_resource));
+		return;
+	}
+
+	if (wlr_surface_is_subsurface(surface) &&
+			wlr_subsurface_from_wlr_surface(surface) != NULL) {
+		wl_resource_post_error(resource,
+			WL_SUBCOMPOSITOR_ERROR_BAD_SURFACE,
+			"%s%" PRIu32 ": wl_surface@%" PRIu32 " is already a sub-surface",
+			msg, id, wl_resource_get_id(surface_resource));
+		return;
+	}
+
+	if (wlr_surface_get_root_surface(parent) == surface) {
+		wl_resource_post_error(resource,
+			WL_SUBCOMPOSITOR_ERROR_BAD_SURFACE,
+			"%s%" PRIu32 ": wl_surface@%" PRIu32 " is an ancestor of parent",
+			msg, id, wl_resource_get_id(surface_resource));
+		return;
+	}
+
+	if (!wlr_surface_set_role(surface, &subsurface_role, NULL,
+			resource, WL_SUBCOMPOSITOR_ERROR_BAD_SURFACE)) {
+		return;
+	}
+
+	subsurface_create(surface, parent, wl_resource_get_version(resource), id);
+}
+
+static const struct wl_subcompositor_interface subcompositor_impl = {
+	.destroy = subcompositor_handle_destroy,
+	.get_subsurface = subcompositor_handle_get_subsurface,
+};
+
+static void subcompositor_bind(struct wl_client *client, void *data,
+		uint32_t version, uint32_t id) {
+	struct wlr_subcompositor *subcompositor = data;
+	struct wl_resource *resource =
+		wl_resource_create(client, &wl_subcompositor_interface, 1, id);
+	if (resource == NULL) {
+		wl_client_post_no_memory(client);
+		return;
+	}
+	wl_resource_set_implementation(resource, &subcompositor_impl,
+		subcompositor, NULL);
+}
+
+static void subcompositor_handle_display_destroy(
+		struct wl_listener *listener, void *data) {
+	struct wlr_subcompositor *subcompositor =
+		wl_container_of(listener, subcompositor, display_destroy);
+	wlr_signal_emit_safe(&subcompositor->events.destroy, NULL);
+	wl_list_remove(&subcompositor->display_destroy.link);
+	wl_global_destroy(subcompositor->global);
+	free(subcompositor);
+}
+
+struct wlr_subcompositor *wlr_subcompositor_create(struct wl_display *display) {
+	struct wlr_subcompositor *subcompositor =
+		calloc(1, sizeof(*subcompositor));
+	if (!subcompositor) {
+		return NULL;
+	}
+
+	subcompositor->global = wl_global_create(display,
+		&wl_subcompositor_interface, SUBCOMPOSITOR_VERSION,
+		subcompositor, subcompositor_bind);
+	if (!subcompositor->global) {
+		free(subcompositor);
+		return NULL;
+	}
+
+	wl_signal_init(&subcompositor->events.destroy);
+
+	subcompositor->display_destroy.notify = subcompositor_handle_display_destroy;
+	wl_display_add_destroy_listener(display, &subcompositor->display_destroy);
+
+	return subcompositor;
+}

types/wlr_surface.c

@@ -6,6 +6,7 @@
 #include <wlr/types/wlr_compositor.h>
 #include <wlr/types/wlr_matrix.h>
 #include <wlr/types/wlr_region.h>
+#include <wlr/types/wlr_subcompositor.h>
 #include <wlr/types/wlr_surface.h>
 #include <wlr/types/wlr_output.h>
 #include <wlr/util/log.h>