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xdg-shell: split last-acked and current state

Browse source 
These states are distinct in the time period between the ack_configure
and the next commit on the surface. Splitting these states avoids the
following race for example:

- client starts at 1000x1000
- wlr_xdg_toplevel_set_size 500x500
- size is different -> configure sent
- client acks the configure
- wlr_xdg_toplevel_set_size 1000x1000
- compare_xdg_toplevel_state returns true since there is no pending
  configure and the currently committed size is still 1000x1000
- no new configure is sent
- client commits at the size it last acked, 500x500
This commit is contained in:
Isaac Freund 2020-07-20 23:43:03 +02:00 committed by Simon Ser
parent 330c50b48d
commit 2072d59da5
4 changed files with 35 additions and 57 deletions
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1
include/wlr/types/wlr_xdg_shell.h
View file

@ -124,6 +124,7 @@ struct wlr_xdg_toplevel {
struct wlr_xdg_toplevel_state client_pending;
struct wlr_xdg_toplevel_state server_pending;
struct wlr_xdg_toplevel_state last_acked;
struct wlr_xdg_toplevel_state current;
char *title;

1
include/wlr/types/wlr_xdg_shell_v6.h
View file

@ -139,6 +139,7 @@ struct wlr_xdg_toplevel_v6 {
struct wlr_xdg_toplevel_v6_state client_pending;
struct wlr_xdg_toplevel_v6_state server_pending;
struct wlr_xdg_toplevel_v6_state last_acked;
struct wlr_xdg_toplevel_v6_state current;
char *title;

47
types/xdg_shell/wlr_xdg_toplevel.c
View file

@ -13,60 +13,44 @@ void handle_xdg_toplevel_ack_configure(
assert(surface->role == WLR_XDG_SURFACE_ROLE_TOPLEVEL);
assert(configure->toplevel_state != NULL);
surface->toplevel->current.maximized =
configure->toplevel_state->maximized;
surface->toplevel->current.fullscreen =
configure->toplevel_state->fullscreen;
surface->toplevel->current.resizing =
configure->toplevel_state->resizing;
surface->toplevel->current.activated =
configure->toplevel_state->activated;
surface->toplevel->current.tiled =
configure->toplevel_state->tiled;
surface->toplevel->last_acked = *configure->toplevel_state;
}
bool compare_xdg_surface_toplevel_state(struct wlr_xdg_toplevel *state) {
struct {
struct wlr_xdg_toplevel_state state;
uint32_t width, height;
} configured;
// is pending state different from current state?
if (!state->base->configured) {
return false;
}
struct wlr_xdg_toplevel_state *configured = NULL;
if (wl_list_empty(&state->base->configure_list)) {
// last configure is actually the current state, just use it
configured.state = state->current;
configured.width = state->base->surface->current.width;
configured.height = state->base->surface->current.height;
// There are currently no pending configures, so check against the last
// state acked by the client.
configured = &state->last_acked;
} else {
struct wlr_xdg_surface_configure *configure =
wl_container_of(state->base->configure_list.prev, configure, link);
configured.state = *configure->toplevel_state;
configured.width = configure->toplevel_state->width;
configured.height = configure->toplevel_state->height;
configured = configure->toplevel_state;
}
if (state->server_pending.activated != configured.state.activated) {
if (state->server_pending.activated != configured->activated) {
return false;
}
if (state->server_pending.fullscreen != configured.state.fullscreen) {
if (state->server_pending.fullscreen != configured->fullscreen) {
return false;
}
if (state->server_pending.maximized != configured.state.maximized) {
if (state->server_pending.maximized != configured->maximized) {
return false;
}
if (state->server_pending.resizing != configured.state.resizing) {
if (state->server_pending.resizing != configured->resizing) {
return false;
}
if (state->server_pending.tiled != configured.state.tiled) {
if (state->server_pending.tiled != configured->tiled) {
return false;
}
if (state->server_pending.width == configured.width &&
state->server_pending.height == configured.height) {
if (state->server_pending.width == configured->width &&
state->server_pending.height == configured->height) {
return true;
}
@ -187,7 +171,10 @@ void handle_xdg_surface_toplevel_committed(struct wlr_xdg_surface *surface) {
return;
}
// update state that doesn't need compositor approval
// apply state from the last acked configure now that the client committed
surface->toplevel->current = surface->toplevel->last_acked;
// update state from the client that doesn't need compositor approval
surface->toplevel->current.max_width =
surface->toplevel->client_pending.max_width;
surface->toplevel->current.min_width =

43
types/xdg_shell_v6/wlr_xdg_toplevel_v6.c
View file

@ -295,55 +295,41 @@ void handle_xdg_toplevel_v6_ack_configure(struct wlr_xdg_surface_v6 *surface,
assert(surface->role == WLR_XDG_SURFACE_V6_ROLE_TOPLEVEL);
assert(configure->toplevel_state != NULL);
surface->toplevel->current.maximized =
configure->toplevel_state->maximized;
surface->toplevel->current.fullscreen =
configure->toplevel_state->fullscreen;
surface->toplevel->current.resizing =
configure->toplevel_state->resizing;
surface->toplevel->current.activated =
configure->toplevel_state->activated;
surface->toplevel->last_acked = *configure->toplevel_state;
}
bool compare_xdg_surface_v6_toplevel_state(struct wlr_xdg_toplevel_v6 *state) {
struct {
struct wlr_xdg_toplevel_v6_state state;
uint32_t width, height;
} configured;
// is pending state different from current state?
if (!state->base->configured) {
return false;
}
struct wlr_xdg_toplevel_v6_state *configured = NULL;
if (wl_list_empty(&state->base->configure_list)) {
// last configure is actually the current state, just use it
configured.state = state->current;
configured.width = state->base->surface->current.width;
configured.height = state->base->surface->current.height;
// There are currently no pending configures, so check against the last
// state acked by the client.
configured = &state->last_acked;
} else {
struct wlr_xdg_surface_v6_configure *configure =
wl_container_of(state->base->configure_list.prev, configure, link);
configured.state = *configure->toplevel_state;
configured.width = configure->toplevel_state->width;
configured.height = configure->toplevel_state->height;
configured = configure->toplevel_state;
}
if (state->server_pending.activated != configured.state.activated) {
if (state->server_pending.activated != configured->activated) {
return false;
}
if (state->server_pending.fullscreen != configured.state.fullscreen) {
if (state->server_pending.fullscreen != configured->fullscreen) {
return false;
}
if (state->server_pending.maximized != configured.state.maximized) {
if (state->server_pending.maximized != configured->maximized) {
return false;
}
if (state->server_pending.resizing != configured.state.resizing) {
if (state->server_pending.resizing != configured->resizing) {
return false;
}
if (state->server_pending.width == configured.width &&
state->server_pending.height == configured.height) {
if (state->server_pending.width == configured->width &&
state->server_pending.height == configured->height) {
return true;
}
@ -430,7 +416,10 @@ void handle_xdg_surface_v6_toplevel_committed(struct wlr_xdg_surface_v6 *surface
return;
}
// update state that doesn't need compositor approval
// apply state from the last acked configure now that the client committed
surface->toplevel->current = surface->toplevel->last_acked;
// update state from the client that doesn't need compositor approval
surface->toplevel->current.max_width =
surface->toplevel->client_pending.max_width;
surface->toplevel->current.min_width =