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surface: allow placing subsurfaces below parent

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Prior to this commit, subsurfaces could only be placed above their
parent. Any place_{above,below} request involving the parent would
fail with a protocol error.

However the Wayland protocol allows using the parent surface in the
place_{above,below} requests, and allows subsurfaces to be placed
below their parent.

Weston's implementation adds a dummy wl_list node in the subsurface
list. However this is potentially dangerous: iterating the list
requires making sure the dummy wl_list node is checked for, otherwise
memory corruption will happen.

Instead, split the list in two: one for subsurfaces above the parent,
the other for subsurfaces below.

Tested with wleird's subsurfaces demo client.

Closes: https://github.com/swaywm/wlroots/issues/1865
This commit is contained in:
Simon Ser 2021-06-01 12:18:53 +02:00
parent 11040d4942
commit 9e58301df7
2 changed files with 102 additions and 38 deletions
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9
include/wlr/types/wlr_surface.h
View file

@ -139,10 +139,13 @@ struct wlr_surface {
struct wl_signal destroy;
} events;
struct wl_list subsurfaces; // wlr_subsurface::parent_link
// wlr_subsurface.parent_link
struct wl_list subsurfaces_below;
struct wl_list subsurfaces_above;
// wlr_subsurface::parent_pending_link
struct wl_list subsurface_pending_list;
// wlr_subsurface.parent_pending_link
struct wl_list subsurfaces_pending_below;
struct wl_list subsurfaces_pending_above;
struct wl_list current_outputs; // wlr_surface_output::link

131
types/wlr_surface.c
View file

@ -341,7 +341,10 @@ static void surface_damage_subsurfaces(struct wlr_subsurface *subsurface) {
subsurface->reordered = false;
struct wlr_subsurface *child;
wl_list_for_each(child, &subsurface->surface->subsurfaces, parent_link) {
wl_list_for_each(child, &subsurface->surface->subsurfaces_below, parent_link) {
surface_damage_subsurfaces(child);
}
wl_list_for_each(child, &subsurface->surface->subsurfaces_above, parent_link) {
surface_damage_subsurfaces(child);
}
}
@ -440,10 +443,20 @@ static void surface_commit_state(struct wlr_surface *surface,
// commit subsurface order
struct wlr_subsurface *subsurface;
wl_list_for_each_reverse(subsurface, &surface->subsurface_pending_list,
wl_list_for_each_reverse(subsurface, &surface->subsurfaces_pending_above,
parent_pending_link) {
wl_list_remove(&subsurface->parent_link);
wl_list_insert(&surface->subsurfaces, &subsurface->parent_link);
wl_list_insert(&surface->subsurfaces_above, &subsurface->parent_link);
if (subsurface->reordered) {
// TODO: damage all the subsurfaces
surface_damage_subsurfaces(subsurface);
}
}
wl_list_for_each_reverse(subsurface, &surface->subsurfaces_pending_below,
parent_pending_link) {
wl_list_remove(&subsurface->parent_link);
wl_list_insert(&surface->subsurfaces_below, &subsurface->parent_link);
if (subsurface->reordered) {
// TODO: damage all the subsurfaces
@ -509,7 +522,10 @@ static void subsurface_parent_commit(struct wlr_subsurface *subsurface,
}
struct wlr_subsurface *subsurface;
wl_list_for_each(subsurface, &surface->subsurfaces, parent_link) {
wl_list_for_each(subsurface, &surface->subsurfaces_below, parent_link) {
subsurface_parent_commit(subsurface, true);
}
wl_list_for_each(subsurface, &surface->subsurfaces_above, parent_link) {
subsurface_parent_commit(subsurface, true);
}
}
@ -541,7 +557,10 @@ static void surface_commit(struct wl_client *client,
surface_commit_pending(surface);
wl_list_for_each(subsurface, &surface->subsurfaces, parent_link) {
wl_list_for_each(subsurface, &surface->subsurfaces_below, parent_link) {
subsurface_parent_commit(subsurface, false);
}
wl_list_for_each(subsurface, &surface->subsurfaces_above, parent_link) {
subsurface_parent_commit(subsurface, false);
}
}
@ -732,8 +751,10 @@ struct wlr_surface *surface_create(struct wl_client *client,
wl_signal_init(&surface->events.commit);
wl_signal_init(&surface->events.destroy);
wl_signal_init(&surface->events.new_subsurface);
wl_list_init(&surface->subsurfaces);
wl_list_init(&surface->subsurface_pending_list);
wl_list_init(&surface->subsurfaces_above);
wl_list_init(&surface->subsurfaces_below);
wl_list_init(&surface->subsurfaces_pending_above);
wl_list_init(&surface->subsurfaces_pending_below);
wl_list_init(&surface->current_outputs);
wl_list_init(&surface->cached);
pixman_region32_init(&surface->buffer_damage);
@ -867,7 +888,12 @@ static struct wlr_subsurface *subsurface_find_sibling(
struct wlr_surface *parent = subsurface->parent;
struct wlr_subsurface *sibling;
wl_list_for_each(sibling, &parent->subsurfaces, parent_link) {
wl_list_for_each(sibling, &parent->subsurfaces_below, parent_link) {
if (sibling->surface == surface && sibling != subsurface) {
return sibling;
}
}
wl_list_for_each(sibling, &parent->subsurfaces_above, parent_link) {
if (sibling->surface == surface && sibling != subsurface) {
return sibling;
}
@ -885,20 +911,25 @@ static void subsurface_handle_place_above(struct wl_client *client,
struct wlr_surface *sibling_surface =
wlr_surface_from_resource(sibling_resource);
struct wlr_subsurface *sibling =
subsurface_find_sibling(subsurface, sibling_surface);
if (!sibling) {
wl_resource_post_error(subsurface->resource,
WL_SUBSURFACE_ERROR_BAD_SURFACE,
"%s: wl_surface@%" PRIu32 "is not a parent or sibling",
"place_above", wl_resource_get_id(sibling_surface->resource));
return;
struct wl_list *node;
if (sibling_surface == subsurface->parent) {
node = &subsurface->parent->subsurfaces_pending_above;
} else {
struct wlr_subsurface *sibling =
subsurface_find_sibling(subsurface, sibling_surface);
if (!sibling) {
wl_resource_post_error(subsurface->resource,
WL_SUBSURFACE_ERROR_BAD_SURFACE,
"%s: wl_surface@%" PRIu32 "is not a parent or sibling",
"place_above", wl_resource_get_id(sibling_resource));
return;
}
node = &sibling->parent_pending_link;
}
wl_list_remove(&subsurface->parent_pending_link);
wl_list_insert(&sibling->parent_pending_link,
&subsurface->parent_pending_link);
wl_list_insert(node, &subsurface->parent_pending_link);
subsurface->reordered = true;
}
@ -912,20 +943,25 @@ static void subsurface_handle_place_below(struct wl_client *client,
struct wlr_surface *sibling_surface =
wlr_surface_from_resource(sibling_resource);
struct wlr_subsurface *sibling =
subsurface_find_sibling(subsurface, sibling_surface);
if (!sibling) {
wl_resource_post_error(subsurface->resource,
WL_SUBSURFACE_ERROR_BAD_SURFACE,
"%s: wl_surface@%" PRIu32 " is not a parent or sibling",
"place_below", wl_resource_get_id(sibling_surface->resource));
return;
struct wl_list *node;
if (sibling_surface == subsurface->parent) {
node = subsurface->parent->subsurfaces_pending_below.prev;
} else {
struct wlr_subsurface *sibling =
subsurface_find_sibling(subsurface, sibling_surface);
if (!sibling) {
wl_resource_post_error(subsurface->resource,
WL_SUBSURFACE_ERROR_BAD_SURFACE,
"%s: wl_surface@%" PRIu32 " is not a parent or sibling",
"place_below", wl_resource_get_id(sibling_resource));
return;
}
node = sibling->parent_pending_link.prev;
}
wl_list_remove(&subsurface->parent_pending_link);
wl_list_insert(sibling->parent_pending_link.prev,
&subsurface->parent_pending_link);
wl_list_insert(node, &subsurface->parent_pending_link);
subsurface->reordered = true;
}
@ -1002,7 +1038,10 @@ static void subsurface_consider_map(struct wlr_subsurface *subsurface,
// Try mapping all children too
struct wlr_subsurface *child;
wl_list_for_each(child, &subsurface->surface->subsurfaces, parent_link) {
wl_list_for_each(child, &subsurface->surface->subsurfaces_below, parent_link) {
subsurface_consider_map(child, false);
}
wl_list_for_each(child, &subsurface->surface->subsurfaces_above, parent_link) {
subsurface_consider_map(child, false);
}
}
@ -1017,7 +1056,10 @@ static void subsurface_unmap(struct wlr_subsurface *subsurface) {
// Unmap all children
struct wlr_subsurface *child;
wl_list_for_each(child, &subsurface->surface->subsurfaces, parent_link) {
wl_list_for_each(child, &subsurface->surface->subsurfaces_below, parent_link) {
subsurface_unmap(child);
}
wl_list_for_each(child, &subsurface->surface->subsurfaces_above, parent_link) {
subsurface_unmap(child);
}
}
@ -1131,8 +1173,8 @@ struct wlr_subsurface *wlr_subsurface_create(struct wlr_surface *surface,
subsurface->parent = parent;
wl_signal_add(&parent->events.destroy, &subsurface->parent_destroy);
subsurface->parent_destroy.notify = subsurface_handle_parent_destroy;
wl_list_insert(parent->subsurfaces.prev, &subsurface->parent_link);
wl_list_insert(parent->subsurface_pending_list.prev,
wl_list_insert(parent->subsurfaces_above.prev, &subsurface->parent_link);
wl_list_insert(parent->subsurfaces_pending_above.prev,
&subsurface->parent_pending_link);
surface->role_data = subsurface;
@ -1175,7 +1217,7 @@ bool wlr_surface_point_accepts_input(struct wlr_surface *surface,
struct wlr_surface *wlr_surface_surface_at(struct wlr_surface *surface,
double sx, double sy, double *sub_x, double *sub_y) {
struct wlr_subsurface *subsurface;
wl_list_for_each_reverse(subsurface, &surface->subsurfaces, parent_link) {
wl_list_for_each_reverse(subsurface, &surface->subsurfaces_above, parent_link) {
double _sub_x = subsurface->current.x;
double _sub_y = subsurface->current.y;
struct wlr_surface *sub = wlr_surface_surface_at(subsurface->surface,
@ -1195,6 +1237,16 @@ struct wlr_surface *wlr_surface_surface_at(struct wlr_surface *surface,
return surface;
}
wl_list_for_each_reverse(subsurface, &surface->subsurfaces_below, parent_link) {
double _sub_x = subsurface->current.x;
double _sub_y = subsurface->current.y;
struct wlr_surface *sub = wlr_surface_surface_at(subsurface->surface,
sx - _sub_x, sy - _sub_y, sub_x, sub_y);
if (sub != NULL) {
return sub;
}
}
return NULL;
}
@ -1290,10 +1342,19 @@ void wlr_surface_send_frame_done(struct wlr_surface *surface,
static void surface_for_each_surface(struct wlr_surface *surface, int x, int y,
wlr_surface_iterator_func_t iterator, void *user_data) {
struct wlr_subsurface *subsurface;
wl_list_for_each(subsurface, &surface->subsurfaces_below, parent_link) {
struct wlr_subsurface_state *state = &subsurface->current;
int sx = state->x;
int sy = state->y;
surface_for_each_surface(subsurface->surface, x + sx, y + sy,
iterator, user_data);
}
iterator(surface, x, y, user_data);
struct wlr_subsurface *subsurface;
wl_list_for_each(subsurface, &surface->subsurfaces, parent_link) {
wl_list_for_each(subsurface, &surface->subsurfaces_above, parent_link) {
struct wlr_subsurface_state *state = &subsurface->current;
int sx = state->x;
int sy = state->y;