Merge pull request #1743 from emersion/subsurface-damage-tracking

Damage tracking for view children

13 files changed, 409 insertions, 51 deletions

diff --git a/include/sway/desktop.h b/include/sway/desktop.h
new file mode 100644
index 00000000..96bdc94c
--- /dev/null
+++ b/include/sway/desktop.h
@@ -0,0 +1,7 @@
+#include <wlr/types/wlr_surface.h>
+
+void desktop_damage_whole_surface(struct wlr_surface *surface, double lx,
+        double ly);
+
+void desktop_damage_from_surface(struct wlr_surface *surface, double lx,
+        double ly);
diff --git a/include/sway/output.h b/include/sway/output.h
index 98d0f83f..4bffa2b7 100644
--- a/include/sway/output.h
+++ b/include/sway/output.h
@@ -34,9 +34,15 @@ struct sway_output {
 
 void output_damage_whole(struct sway_output *output);
 
+void output_damage_whole_surface(struct sway_output *output,
+        double ox, double oy, struct wlr_surface *surface);
+
 void output_damage_whole_view(struct sway_output *output,
         struct sway_view *view);
 
+void output_damage_whole_container(struct sway_output *output,
+        struct sway_container *con);
+
 struct sway_container *output_by_name(const char *name);
 
 #endif
diff --git a/include/sway/tree/container.h b/include/sway/tree/container.h
index 3a3a9429..7acb607b 100644
--- a/include/sway/tree/container.h
+++ b/include/sway/tree/container.h
@@ -97,8 +97,7 @@ struct sway_container *container_create(enum sway_container_type type);
 
 const char *container_type_to_str(enum sway_container_type type);
 
-struct sway_container *output_create(
-                struct sway_output *sway_output);
+struct sway_container *output_create(struct sway_output *sway_output);
 
 /**
  * Create a new container container. A container container can be a a child of
@@ -116,7 +115,8 @@ struct sway_container *output_create(struct sway_output *sway_output);
  * Create a new workspace container. Workspaces are children of an output
  * container and are ordered alphabetically by name.
  */
-struct sway_container *workspace_create(struct sway_container *output, const char *name);
+struct sway_container *workspace_create(struct sway_container *output,
+                const char *name);
 
 /*
  * Create a new view container. A view can be a child of a workspace container
@@ -182,4 +182,6 @@ bool container_has_child(struct sway_container *con,
 
 void container_create_notify(struct sway_container *container);
 
+void container_damage_whole(struct sway_container *container);
+
 #endif
diff --git a/include/sway/tree/view.h b/include/sway/tree/view.h
index d4dace4a..03d27ceb 100644
--- a/include/sway/tree/view.h
+++ b/include/sway/tree/view.h
@@ -45,6 +45,12 @@ struct sway_view {
                 struct wlr_xwayland_surface *wlr_xwayland_surface;
                 struct wlr_wl_shell_surface *wlr_wl_shell_surface;
         };
+
+        struct {
+                struct wl_signal unmap;
+        } events;
+
+        struct wl_listener surface_new_subsurface;
 };
 
 struct sway_xdg_shell_v6_view {
@@ -54,6 +60,7 @@ struct sway_xdg_shell_v6_view {
         struct wl_listener request_move;
         struct wl_listener request_resize;
         struct wl_listener request_maximize;
+        struct wl_listener new_popup;
         struct wl_listener map;
         struct wl_listener unmap;
         struct wl_listener destroy;
@@ -80,6 +87,12 @@ struct sway_xwayland_unmanaged {
         struct wlr_xwayland_surface *wlr_xwayland_surface;
         struct wl_list link;
 
+        int lx, ly;
+
+        struct wl_listener request_configure;
+        struct wl_listener commit;
+        struct wl_listener map;
+        struct wl_listener unmap;
         struct wl_listener destroy;
 };
 
@@ -95,6 +108,37 @@ struct sway_wl_shell_view {
         int pending_width, pending_height;
 };
 
+struct sway_view_child;
+
+struct sway_view_child_impl {
+        void (*destroy)(struct sway_view_child *child);
+};
+
+/**
+ * A view child is a surface in the view tree, such as a subsurface or a popup.
+ */
+struct sway_view_child {
+        const struct sway_view_child_impl *impl;
+
+        struct sway_view *view;
+        struct wlr_surface *surface;
+
+        struct wl_listener surface_commit;
+        struct wl_listener surface_new_subsurface;
+        struct wl_listener surface_destroy;
+        struct wl_listener view_unmap;
+};
+
+struct sway_xdg_popup_v6 {
+        struct sway_view_child child;
+
+        struct wlr_xdg_surface_v6 *wlr_xdg_surface_v6;
+
+        struct wl_listener new_popup;
+        struct wl_listener unmap;
+        struct wl_listener destroy;
+};
+
 const char *view_get_title(struct sway_view *view);
 
 const char *view_get_app_id(struct sway_view *view);
@@ -129,4 +173,10 @@ void view_update_position(struct sway_view *view, double ox, double oy);
 
 void view_update_size(struct sway_view *view, int width, int height);
 
+void view_child_init(struct sway_view_child *child,
+        const struct sway_view_child_impl *impl, struct sway_view *view,
+        struct wlr_surface *surface);
+
+void view_child_destroy(struct sway_view_child *child);
+
 #endif
diff --git a/sway/desktop/desktop.c b/sway/desktop/desktop.c
new file mode 100644
index 00000000..3a13191f
--- /dev/null
+++ b/sway/desktop/desktop.c
@@ -0,0 +1,20 @@
+#include "sway/tree/container.h"
+#include "sway/desktop.h"
+#include "sway/output.h"
+
+void desktop_damage_whole_surface(struct wlr_surface *surface, double lx,
+                double ly) {
+        for (int i = 0; i < root_container.children->length; ++i) {
+                struct sway_container *cont = root_container.children->items[i];
+                if (cont->type == C_OUTPUT) {
+                        output_damage_whole_surface(cont->sway_output,
+                                lx - cont->x, ly - cont->y, surface);
+                }
+        }
+}
+
+void desktop_damage_from_surface(struct wlr_surface *surface, double lx,
+                double ly) {
+        // TODO
+        desktop_damage_whole_surface(surface, lx, ly);
+}
diff --git a/sway/desktop/output.c b/sway/desktop/output.c
index 0e8a9485..aa18f1b8 100644
--- a/sway/desktop/output.c
+++ b/sway/desktop/output.c
@@ -267,17 +267,14 @@ static void render_output(struct sway_output *output, struct timespec *when,
 
         // render unmanaged views on top
         struct wl_list *unmanaged = &root_container.sway_root->xwayland_unmanaged;
-        struct sway_xwayland_unmanaged *sway_surface;
-        wl_list_for_each(sway_surface, unmanaged, link) {
+        struct sway_xwayland_unmanaged *unmanaged_surface;
+        wl_list_for_each(unmanaged_surface, unmanaged, link) {
                 struct wlr_xwayland_surface *xsurface =
-                        sway_surface->wlr_xwayland_surface;
-                if (xsurface->surface == NULL) {
-                        continue;
-                }
+                        unmanaged_surface->wlr_xwayland_surface;
 
                 const struct wlr_box view_box = {
-                        .x = xsurface->x,
-                        .y = xsurface->y,
+                        .x = unmanaged_surface->lx,
+                        .y = unmanaged_surface->ly,
                         .width = xsurface->width,
                         .height = xsurface->height,
                 };
@@ -335,12 +332,24 @@ void output_damage_whole(struct sway_output *output) {
         wlr_output_damage_add_whole(output->damage);
 }
 
+void output_damage_whole_surface(struct sway_output *output,
+                double ox, double oy, struct wlr_surface *surface) {
+        // TODO
+        output_damage_whole(output);
+}
+
 void output_damage_whole_view(struct sway_output *output,
                 struct sway_view *view) {
         // TODO
         output_damage_whole(output);
 }
 
+void output_damage_whole_container(struct sway_output *output,
+                struct sway_container *con) {
+        // TODO
+        output_damage_whole(output);
+}
+
 static void damage_handle_destroy(struct wl_listener *listener, void *data) {
         struct sway_output *output =
                 wl_container_of(listener, output, damage_destroy);
diff --git a/sway/desktop/wl_shell.c b/sway/desktop/wl_shell.c
index 5955fa9d..fff31da8 100644
--- a/sway/desktop/wl_shell.c
+++ b/sway/desktop/wl_shell.c
@@ -68,6 +68,7 @@ static const struct sway_view_impl view_impl = {
         .get_prop = get_prop,
         .configure = configure,
         .close = _close,
+        .destroy = destroy,
 };
 
 static void handle_commit(struct wl_listener *listener, void *data) {
diff --git a/sway/desktop/xdg_shell_v6.c b/sway/desktop/xdg_shell_v6.c
index 7b9d5fb7..c66cc39a 100644
--- a/sway/desktop/xdg_shell_v6.c
+++ b/sway/desktop/xdg_shell_v6.c
@@ -11,6 +11,66 @@
 #include "sway/input/input-manager.h"
 #include "log.h"
 
+static const struct sway_view_child_impl popup_impl;
+
+static void popup_destroy(struct sway_view_child *child) {
+        if (!sway_assert(child->impl == &popup_impl,
+                        "Expected an xdg_shell_v6 popup")) {
+                return;
+        }
+        struct sway_xdg_popup_v6 *popup = (struct sway_xdg_popup_v6 *)child;
+        wl_list_remove(&popup->new_popup.link);
+        wl_list_remove(&popup->unmap.link);
+        wl_list_remove(&popup->destroy.link);
+        free(popup);
+}
+
+static const struct sway_view_child_impl popup_impl = {
+        .destroy = popup_destroy,
+};
+
+static struct sway_xdg_popup_v6 *popup_create(
+        struct wlr_xdg_popup_v6 *wlr_popup, struct sway_view *view);
+
+static void popup_handle_new_popup(struct wl_listener *listener, void *data) {
+        struct sway_xdg_popup_v6 *popup =
+                wl_container_of(listener, popup, new_popup);
+        struct wlr_xdg_popup_v6 *wlr_popup = data;
+        popup_create(wlr_popup, popup->child.view);
+}
+
+static void popup_handle_unmap(struct wl_listener *listener, void *data) {
+        struct sway_xdg_popup_v6 *popup = wl_container_of(listener, popup, unmap);
+        view_child_destroy(&popup->child);
+}
+
+static void popup_handle_destroy(struct wl_listener *listener, void *data) {
+        struct sway_xdg_popup_v6 *popup = wl_container_of(listener, popup, destroy);
+        view_child_destroy(&popup->child);
+}
+
+static struct sway_xdg_popup_v6 *popup_create(
+                struct wlr_xdg_popup_v6 *wlr_popup, struct sway_view *view) {
+        struct wlr_xdg_surface_v6 *xdg_surface = wlr_popup->base;
+
+        struct sway_xdg_popup_v6 *popup =
+                calloc(1, sizeof(struct sway_xdg_popup_v6));
+        if (popup == NULL) {
+                return NULL;
+        }
+        view_child_init(&popup->child, &popup_impl, view, xdg_surface->surface);
+
+        wl_signal_add(&xdg_surface->events.new_popup, &popup->new_popup);
+        popup->new_popup.notify = popup_handle_new_popup;
+        wl_signal_add(&xdg_surface->events.unmap, &popup->unmap);
+        popup->unmap.notify = popup_handle_unmap;
+        wl_signal_add(&xdg_surface->events.destroy, &popup->destroy);
+        popup->destroy.notify = popup_handle_destroy;
+
+        return popup;
+}
+
+
 static struct sway_xdg_shell_v6_view *xdg_shell_v6_view_from_view(
                 struct sway_view *view) {
         if (!sway_assert(view->type == SWAY_VIEW_XDG_SHELL_V6,
@@ -76,6 +136,7 @@ static void destroy(struct sway_view *view) {
         }
         wl_list_remove(&xdg_shell_v6_view->commit.link);
         wl_list_remove(&xdg_shell_v6_view->destroy.link);
+        wl_list_remove(&xdg_shell_v6_view->new_popup.link);
         wl_list_remove(&xdg_shell_v6_view->map.link);
         wl_list_remove(&xdg_shell_v6_view->unmap.link);
         free(xdg_shell_v6_view);
@@ -86,6 +147,7 @@ static const struct sway_view_impl view_impl = {
         .configure = configure,
         .set_activated = set_activated,
         .close = _close,
+        .destroy = destroy,
 };
 
 static void handle_commit(struct wl_listener *listener, void *data) {
@@ -100,6 +162,13 @@ static void handle_commit(struct wl_listener *listener, void *data) {
         view_damage_from(view);
 }
 
+static void handle_new_popup(struct wl_listener *listener, void *data) {
+        struct sway_xdg_shell_v6_view *xdg_shell_v6_view =
+                wl_container_of(listener, xdg_shell_v6_view, new_popup);
+        struct wlr_xdg_popup_v6 *wlr_popup = data;
+        popup_create(wlr_popup, &xdg_shell_v6_view->view);
+}
+
 static void handle_unmap(struct wl_listener *listener, void *data) {
         struct sway_xdg_shell_v6_view *xdg_shell_v6_view =
                 wl_container_of(listener, xdg_shell_v6_view, unmap);
@@ -151,6 +220,10 @@ void handle_xdg_shell_v6_surface(struct wl_listener *listener, void *data) {
         wl_signal_add(&xdg_surface->surface->events.commit,
                 &xdg_shell_v6_view->commit);
 
+        xdg_shell_v6_view->new_popup.notify = handle_new_popup;
+        wl_signal_add(&xdg_surface->events.new_popup,
+                &xdg_shell_v6_view->new_popup);
+
         xdg_shell_v6_view->map.notify = handle_map;
         wl_signal_add(&xdg_surface->events.map, &xdg_shell_v6_view->map);
 
diff --git a/sway/desktop/xwayland.c b/sway/desktop/xwayland.c
index 384f4236..e3da1da7 100644
--- a/sway/desktop/xwayland.c
+++ b/sway/desktop/xwayland.c
@@ -2,42 +2,110 @@
 #include <stdbool.h>
 #include <stdlib.h>
 #include <wayland-server.h>
-#include <wlr/xwayland.h>
 #include <wlr/types/wlr_output_layout.h>
 #include <wlr/types/wlr_output.h>
+#include <wlr/xwayland.h>
+#include "log.h"
+#include "sway/desktop.h"
+#include "sway/input/input-manager.h"
+#include "sway/input/seat.h"
+#include "sway/output.h"
+#include "sway/server.h"
 #include "sway/tree/container.h"
 #include "sway/tree/layout.h"
-#include "sway/server.h"
 #include "sway/tree/view.h"
-#include "sway/output.h"
-#include "sway/input/seat.h"
-#include "sway/input/input-manager.h"
-#include "log.h"
 
-static void unmanaged_handle_destroy(struct wl_listener *listener, void *data) {
-        struct sway_xwayland_unmanaged *sway_surface =
-                wl_container_of(listener, sway_surface, destroy);
-        wl_list_remove(&sway_surface->destroy.link);
-        wl_list_remove(&sway_surface->link);
-        free(sway_surface);
+static void unmanaged_handle_request_configure(struct wl_listener *listener,
+                void *data) {
+        struct sway_xwayland_unmanaged *surface =
+                wl_container_of(listener, surface, request_configure);
+        struct wlr_xwayland_surface *xsurface = surface->wlr_xwayland_surface;
+        struct wlr_xwayland_surface_configure_event *ev = data;
+        wlr_xwayland_surface_configure(xsurface, ev->x, ev->y,
+                ev->width, ev->height);
 }
 
-static void create_unmanaged(struct wlr_xwayland_surface *xsurface) {
-        struct sway_xwayland_unmanaged *sway_surface =
-                calloc(1, sizeof(struct sway_xwayland_unmanaged));
-        if (!sway_assert(sway_surface, "Failed to allocate surface")) {
-                return;
+static void unmanaged_handle_commit(struct wl_listener *listener, void *data) {
+        struct sway_xwayland_unmanaged *surface =
+                wl_container_of(listener, surface, commit);
+        struct wlr_xwayland_surface *xsurface = surface->wlr_xwayland_surface;
+
+        if (xsurface->x != surface->lx || xsurface->y != surface->ly) {
+                // Surface has moved
+                desktop_damage_whole_surface(xsurface->surface,
+                        surface->lx, surface->ly);
+                surface->lx = xsurface->x;
+                surface->ly = xsurface->y;
+                desktop_damage_whole_surface(xsurface->surface,
+                        surface->lx, surface->ly);
+        } else {
+                desktop_damage_from_surface(xsurface->surface,
+                        xsurface->x, xsurface->y);
         }
+}
 
-        sway_surface->wlr_xwayland_surface = xsurface;
-
-        wl_signal_add(&xsurface->events.destroy, &sway_surface->destroy);
-        sway_surface->destroy.notify = unmanaged_handle_destroy;
+static void unmanaged_handle_map(struct wl_listener *listener, void *data) {
+        struct sway_xwayland_unmanaged *surface =
+                wl_container_of(listener, surface, map);
+        struct wlr_xwayland_surface *xsurface = surface->wlr_xwayland_surface;
 
         wl_list_insert(&root_container.sway_root->xwayland_unmanaged,
-                &sway_surface->link);
+                &surface->link);
+
+        wl_signal_add(&xsurface->surface->events.commit, &surface->commit);
+        surface->commit.notify = unmanaged_handle_commit;
+
+        surface->lx = xsurface->x;
+        surface->ly = xsurface->y;
+        desktop_damage_whole_surface(xsurface->surface, surface->lx, surface->ly);
+}
+
+static void unmanaged_handle_unmap(struct wl_listener *listener, void *data) {
+        struct sway_xwayland_unmanaged *surface =
+                wl_container_of(listener, surface, unmap);
+        struct wlr_xwayland_surface *xsurface = surface->wlr_xwayland_surface;
+        desktop_damage_whole_surface(xsurface->surface, xsurface->x, xsurface->y);
+        wl_list_remove(&surface->link);
+        wl_list_remove(&surface->commit.link);
+}
 
-        // TODO: damage tracking
+static void unmanaged_handle_destroy(struct wl_listener *listener, void *data) {
+        struct sway_xwayland_unmanaged *surface =
+                wl_container_of(listener, surface, destroy);
+        struct wlr_xwayland_surface *xsurface = surface->wlr_xwayland_surface;
+        if (xsurface->mapped) {
+                unmanaged_handle_unmap(&surface->unmap, xsurface);
+        }
+        wl_list_remove(&surface->map.link);
+        wl_list_remove(&surface->unmap.link);
+        wl_list_remove(&surface->destroy.link);
+        free(surface);
+}
+
+static struct sway_xwayland_unmanaged *create_unmanaged(
+                struct wlr_xwayland_surface *xsurface) {
+        struct sway_xwayland_unmanaged *surface =
+                calloc(1, sizeof(struct sway_xwayland_unmanaged));
+        if (surface == NULL) {
+                wlr_log(L_ERROR, "Allocation failed");
+                return NULL;
+        }
+
+        surface->wlr_xwayland_surface = xsurface;
+
+        wl_signal_add(&xsurface->events.request_configure,
+                &surface->request_configure);
+        surface->request_configure.notify = unmanaged_handle_request_configure;
+        wl_signal_add(&xsurface->events.map, &surface->map);
+        surface->map.notify = unmanaged_handle_map;
+        wl_signal_add(&xsurface->events.unmap, &surface->unmap);
+        surface->unmap.notify = unmanaged_handle_unmap;
+        wl_signal_add(&xsurface->events.destroy, &surface->destroy);
+        surface->destroy.notify = unmanaged_handle_destroy;
+
+        unmanaged_handle_map(&surface->map, xsurface);
+
+        return surface;
 }
 
 
@@ -127,6 +195,7 @@ static const struct sway_view_impl view_impl = {
         .configure = configure,
         .set_activated = set_activated,
         .close = _close,
+        .destroy = destroy,
 };
 
 static void handle_commit(struct wl_listener *listener, void *data) {
@@ -140,12 +209,6 @@ static void handle_commit(struct wl_listener *listener, void *data) {
         view_damage_from(view);
 }
 
-static void handle_destroy(struct wl_listener *listener, void *data) {
-        struct sway_xwayland_view *xwayland_view =
-                wl_container_of(listener, xwayland_view, destroy);
-        view_destroy(&xwayland_view->view);
-}
-
 static void handle_unmap(struct wl_listener *listener, void *data) {
         struct sway_xwayland_view *xwayland_view =
                 wl_container_of(listener, xwayland_view, unmap);
@@ -169,6 +232,17 @@ static void handle_map(struct wl_listener *listener, void *data) {
         view_map(view, xsurface->surface);
 }
 
+static void handle_destroy(struct wl_listener *listener, void *data) {
+        struct sway_xwayland_view *xwayland_view =
+                wl_container_of(listener, xwayland_view, destroy);
+        struct sway_view *view = &xwayland_view->view;
+        struct wlr_xwayland_surface *xsurface = view->wlr_xwayland_surface;
+        if (xsurface->mapped) {
+                handle_unmap(&xwayland_view->unmap, xsurface);
+        }
+        view_destroy(&xwayland_view->view);
+}
+
 static void handle_request_configure(struct wl_listener *listener, void *data) {
         struct sway_xwayland_view *xwayland_view =
                 wl_container_of(listener, xwayland_view, request_configure);
diff --git a/sway/input/cursor.c b/sway/input/cursor.c
index 195ddce9..b83bc9fe 100644
--- a/sway/input/cursor.c
+++ b/sway/input/cursor.c
@@ -48,17 +48,13 @@ static struct sway_container *container_at_cursor(struct sway_cursor *cursor,
                 struct wlr_surface **surface, double *sx, double *sy) {
         // check for unmanaged views first
         struct wl_list *unmanaged = &root_container.sway_root->xwayland_unmanaged;
-        struct sway_xwayland_unmanaged *sway_surface;
-        wl_list_for_each_reverse(sway_surface, unmanaged, link) {
+        struct sway_xwayland_unmanaged *unmanaged_surface;
+        wl_list_for_each_reverse(unmanaged_surface, unmanaged, link) {
                 struct wlr_xwayland_surface *xsurface =
-                        sway_surface->wlr_xwayland_surface;
-                if (xsurface->surface == NULL) {
-                        continue;
-                }
-
+                        unmanaged_surface->wlr_xwayland_surface;
                 struct wlr_box box = {
-                        .x = xsurface->x,
-                        .y = xsurface->y,
+                        .x = unmanaged_surface->lx,
+                        .y = unmanaged_surface->ly,
                         .width = xsurface->width,
                         .height = xsurface->height,
                 };
diff --git a/sway/meson.build b/sway/meson.build
index ec7b4c42..29aaa7b7 100644
--- a/sway/meson.build
+++ b/sway/meson.build
@@ -8,6 +8,7 @@ sway_sources = files(
         'ipc-server.c',
         'security.c',
 
+        'desktop/desktop.c',
         'desktop/output.c',
         'desktop/layer_shell.c',
         'desktop/wl_shell.c',
diff --git a/sway/tree/container.c b/sway/tree/container.c
index 3e8c1c75..41321dc8 100644
--- a/sway/tree/container.c
+++ b/sway/tree/container.c
@@ -514,9 +514,16 @@ static bool find_child_func(struct sway_container *con, void *data) {
 
 bool container_has_child(struct sway_container *con,
                 struct sway_container *child) {
-        if (con == NULL || con->type == C_VIEW ||
-                        con->children->length == 0) {
+        if (con == NULL || con->type == C_VIEW || con->children->length == 0) {
                 return false;
         }
         return container_find(con, find_child_func, child);
 }
+
+void container_damage_whole(struct sway_container *con) {
+        struct sway_container *output = con;
+        if (output->type != C_OUTPUT) {
+                output = container_parent(output, C_OUTPUT);
+        }
+        output_damage_whole_container(output->sway_output, con);
+}
diff --git a/sway/tree/view.c b/sway/tree/view.c
index 3927c195..d3e3186c 100644
--- a/sway/tree/view.c
+++ b/sway/tree/view.c
@@ -11,6 +11,7 @@ void view_init(struct sway_view *view, enum sway_view_type type,
                 const struct sway_view_impl *impl) {
         view->type = type;
         view->impl = impl;
+        wl_signal_init(&view->events.unmap);
 }
 
 void view_destroy(struct sway_view *view) {
@@ -123,6 +124,20 @@ static void view_update_outputs(struct sway_view *view,
         }
 }
 
+static void view_subsurface_create(struct sway_view *view,
+        struct wlr_subsurface *subsurface);
+
+static void view_init_subsurfaces(struct sway_view *view,
+        struct wlr_surface *surface);
+
+static void view_handle_surface_new_subsurface(struct wl_listener *listener,
+                void *data) {
+        struct sway_view *view =
+                wl_container_of(listener, view, surface_new_subsurface);
+        struct wlr_subsurface *subsurface = data;
+        view_subsurface_create(view, subsurface);
+}
+
 void view_map(struct sway_view *view, struct wlr_surface *wlr_surface) {
         if (!sway_assert(view->surface == NULL, "cannot map mapped view")) {
                 return;
@@ -136,6 +151,11 @@ void view_map(struct sway_view *view, struct wlr_surface *wlr_surface) {
         view->surface = wlr_surface;
         view->swayc = cont;
 
+        view_init_subsurfaces(view, wlr_surface);
+        wl_signal_add(&wlr_surface->events.new_subsurface,
+                &view->surface_new_subsurface);
+        view->surface_new_subsurface.notify = view_handle_surface_new_subsurface;
+
         arrange_windows(cont->parent, -1, -1);
         input_manager_set_focus(input_manager, cont);
 
@@ -148,10 +168,14 @@ void view_unmap(struct sway_view *view) {
                 return;
         }
 
+        wl_signal_emit(&view->events.unmap, view);
+
         view_damage_whole(view);
 
         struct sway_container *parent = container_destroy(view->swayc);
 
+        wl_list_remove(&view->surface_new_subsurface.link);
+
         view->swayc = NULL;
         view->surface = NULL;
 
@@ -185,3 +209,91 @@ void view_update_size(struct sway_view *view, int width, int height) {
         view_update_outputs(view, &box);
         view_damage_whole(view);
 }
+
+
+static void view_subsurface_create(struct sway_view *view,
+                struct wlr_subsurface *subsurface) {
+        struct sway_view_child *child = calloc(1, sizeof(struct sway_view_child));
+        if (child == NULL) {
+                wlr_log(L_ERROR, "Allocation failed");
+                return;
+        }
+        view_child_init(child, NULL, view, subsurface->surface);
+}
+
+static void view_child_handle_surface_commit(struct wl_listener *listener,
+                void *data) {
+        struct sway_view_child *child =
+                wl_container_of(listener, child, surface_commit);
+        // TODO: only accumulate damage from the child
+        view_damage_from(child->view);
+}
+
+static void view_child_handle_surface_new_subsurface(
+                struct wl_listener *listener, void *data) {
+        struct sway_view_child *child =
+                wl_container_of(listener, child, surface_new_subsurface);
+        struct wlr_subsurface *subsurface = data;
+        view_subsurface_create(child->view, subsurface);
+}
+
+static void view_child_handle_surface_destroy(struct wl_listener *listener,
+                void *data) {
+        struct sway_view_child *child =
+                wl_container_of(listener, child, surface_destroy);
+        view_child_destroy(child);
+}
+
+static void view_child_handle_view_unmap(struct wl_listener *listener,
+                void *data) {
+        struct sway_view_child *child =
+                wl_container_of(listener, child, view_unmap);
+        view_child_destroy(child);
+}
+
+static void view_init_subsurfaces(struct sway_view *view,
+                struct wlr_surface *surface) {
+        struct wlr_subsurface *subsurface;
+        wl_list_for_each(subsurface, &surface->subsurface_list, parent_link) {
+                view_subsurface_create(view, subsurface);
+        }
+}
+
+void view_child_init(struct sway_view_child *child,
+                const struct sway_view_child_impl *impl, struct sway_view *view,
+                struct wlr_surface *surface) {
+        child->impl = impl;
+        child->view = view;
+        child->surface = surface;
+
+        wl_signal_add(&surface->events.commit, &child->surface_commit);
+        child->surface_commit.notify = view_child_handle_surface_commit;
+        wl_signal_add(&surface->events.new_subsurface,
+                &child->surface_new_subsurface);
+        child->surface_new_subsurface.notify =
+                view_child_handle_surface_new_subsurface;
+        wl_signal_add(&surface->events.destroy, &child->surface_destroy);
+        child->surface_destroy.notify = view_child_handle_surface_destroy;
+        wl_signal_add(&view->events.unmap, &child->view_unmap);
+        child->view_unmap.notify = view_child_handle_view_unmap;
+
+        view_init_subsurfaces(child->view, surface);
+
+        // TODO: only damage the whole child
+        view_damage_whole(child->view);
+}
+
+void view_child_destroy(struct sway_view_child *child) {
+        // TODO: only damage the whole child
+        view_damage_whole(child->view);
+
+        wl_list_remove(&child->surface_commit.link);
+        wl_list_remove(&child->surface_destroy.link);
+        wl_list_remove(&child->view_unmap.link);
+
+        if (child->impl && child->impl->destroy) {
+                child->impl->destroy(child);
+        } else {
+                free(child);
+        }
+}