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xdg-shell: Rework the state system

Browse Source 
The states system, so far, has been a complicated mix of weird APIs
that solved a real race condition, but have been particularly ugly
for both compositors and clients to implement.
dev
Jasper St. Pierre 11 years ago committed by Kristian Høgsberg
parent c815d62b85
commit ab2c108137
5 changed files with 205 additions and 230 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
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  1. 77
      clients/simple-egl.c
  2. 13
      clients/simple-shm.c
  3. 63
      clients/window.c
  4. 142
      desktop-shell/shell.c
  5. 118
      protocol/xdg-shell.xml

77
clients/simple-egl.c
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@ -268,40 +268,39 @@ init_gl(struct window *window)
static void
handle_surface_configure(void *data, struct xdg_surface *surface,
int32_t width, int32_t height)
{
struct window *window = data;
if (window->native)
wl_egl_window_resize(window->native, width, height, 0, 0);
window->geometry.width = width;
window->geometry.height = height;
if (!window->fullscreen)
window->window_size = window->geometry;
}
static void
handle_surface_change_state(void *data, struct xdg_surface *xdg_surface,
uint32_t state,
uint32_t value,
uint32_t serial)
int32_t width, int32_t height,
struct wl_array *states, uint32_t serial)
{
struct window *window = data;
uint32_t *p;
window->fullscreen = 0;
wl_array_for_each(p, states) {
uint32_t state = *p;
switch (state) {
case XDG_SURFACE_STATE_FULLSCREEN:
window->fullscreen = value;
if (!value)
handle_surface_configure(window, window->xdg_surface,
window->window_size.width,
window->window_size.height);
window->fullscreen = 1;
break;
}
}
if (width > 0 && height > 0) {
if (!window->fullscreen) {
window->window_size.width = width;
window->window_size.height = height;
}
window->geometry.width = width;
window->geometry.height = height;
} else if (!window->fullscreen) {
window->geometry = window->window_size;
}
xdg_surface_ack_change_state(xdg_surface, state, value, serial);
if (window->native)
wl_egl_window_resize(window->native,
window->geometry.width,
window->geometry.height, 0, 0);
xdg_surface_ack_configure(surface, serial);
}
static void
@ -322,7 +321,6 @@ handle_surface_delete(void *data, struct xdg_surface *xdg_surface)
static const struct xdg_surface_listener xdg_surface_listener = {
handle_surface_configure,
handle_surface_change_state,
handle_surface_activated,
handle_surface_deactivated,
handle_surface_delete,
@ -343,8 +341,8 @@ create_surface(struct window *window)
window->native =
wl_egl_window_create(window->surface,
window->window_size.width,
window->window_size.height);
window->geometry.width,
window->geometry.height);
window->egl_surface =
eglCreateWindowSurface(display->egl.dpy,
display->egl.conf,
@ -359,9 +357,8 @@ create_surface(struct window *window)
if (!window->frame_sync)
eglSwapInterval(display->egl.dpy, 0);
xdg_surface_request_change_state(window->xdg_surface,
XDG_SURFACE_STATE_FULLSCREEN,
window->fullscreen, 0);
if (window->fullscreen)
xdg_surface_set_fullscreen(window->xdg_surface, NULL);
}
static void
@ -620,11 +617,12 @@ keyboard_handle_key(void *data, struct wl_keyboard *keyboard,
{
struct display *d = data;
if (key == KEY_F11 && state)
xdg_surface_request_change_state(d->window->xdg_surface,
XDG_SURFACE_STATE_FULLSCREEN,
!d->window->fullscreen, 0);
else if (key == KEY_ESC && state)
if (key == KEY_F11 && state) {
if (d->window->fullscreen)
xdg_surface_unset_fullscreen(d->window->xdg_surface);
else
xdg_surface_set_fullscreen(d->window->xdg_surface, NULL);
} else if (key == KEY_ESC && state)
running = 0;
}
@ -772,8 +770,9 @@ main(int argc, char **argv)
window.display = &display;
display.window = &window;
window.window_size.width = 250;
window.window_size.height = 250;
window.geometry.width = 250;
window.geometry.height = 250;
window.window_size = window.geometry;
window.buffer_size = 32;
window.frame_sync = 1;

13
clients/simple-shm.c
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@ -117,16 +117,10 @@ create_shm_buffer(struct display *display, struct buffer *buffer,
static void
handle_configure(void *data, struct xdg_surface *surface,
int32_t width, int32_t height)
{
}
static void
handle_change_state(void *data, struct xdg_surface *xdg_surface,
uint32_t state,
uint32_t value,
uint32_t serial)
int32_t width, int32_t height,
struct wl_array *states, uint32_t serial)
{
xdg_surface_ack_configure(surface, serial);
}
static void
@ -147,7 +141,6 @@ handle_delete(void *data, struct xdg_surface *xdg_surface)
static const struct xdg_surface_listener xdg_surface_listener = {
handle_configure,
handle_change_state,
handle_activated,
handle_deactivated,
handle_delete,

63
clients/window.c
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@ -230,6 +230,8 @@ struct window {
int fullscreen;
int maximized;
int next_attach_serial;
enum preferred_format preferred_format;
window_key_handler_t key_handler;
@ -1338,6 +1340,12 @@ surface_flush(struct surface *surface)
surface->input_region = NULL;
}
if (surface->window->next_attach_serial > 0) {
xdg_surface_ack_configure(surface->window->xdg_surface,
surface->window->next_attach_serial);
surface->window->next_attach_serial = 0;
}
surface->toysurface->swap(surface->toysurface,
surface->buffer_transform, surface->buffer_scale,
&surface->server_allocation);
@ -3849,37 +3857,39 @@ widget_schedule_resize(struct widget *widget, int32_t width, int32_t height)
static void
handle_surface_configure(void *data, struct xdg_surface *xdg_surface,
int32_t width, int32_t height)
int32_t width, int32_t height,
struct wl_array *states, uint32_t serial)
{
struct window *window = data;
uint32_t *p;
if (width > 0 && height > 0) {
window_schedule_resize(window, width, height);
}
} else {
window_schedule_resize(window,
window->saved_allocation.width,
window->saved_allocation.height);
}
static void
handle_surface_change_state(void *data, struct xdg_surface *xdg_surface,
uint32_t state,
uint32_t value,
uint32_t serial)
{
struct window *window = data;
window->maximized = 0;
window->fullscreen = 0;
wl_array_for_each(p, states) {
uint32_t state = *p;
switch (state) {
case XDG_SURFACE_STATE_MAXIMIZED:
window->maximized = value;
window->maximized = 1;
break;
case XDG_SURFACE_STATE_FULLSCREEN:
window->fullscreen = value;
window->fullscreen = 1;
break;
default:
/* Unknown state */
break;
}
}
if (!window->fullscreen && !window->maximized)
window_schedule_resize(window,
window->saved_allocation.width,
window->saved_allocation.height);
xdg_surface_ack_change_state(xdg_surface, state, value, serial);
window_schedule_redraw(window);
window->next_attach_serial = serial;
}
static void
@ -3905,7 +3915,6 @@ handle_surface_delete(void *data, struct xdg_surface *xdg_surface)
static const struct xdg_surface_listener xdg_surface_listener = {
handle_surface_configure,
handle_surface_change_state,
handle_surface_activated,
handle_surface_deactivated,
handle_surface_delete,
@ -4145,10 +4154,10 @@ window_set_fullscreen(struct window *window, int fullscreen)
if (window->fullscreen == fullscreen)
return;
xdg_surface_request_change_state(window->xdg_surface,
XDG_SURFACE_STATE_FULLSCREEN,
fullscreen ? 1 : 0,
0);
if (fullscreen)
xdg_surface_set_fullscreen(window->xdg_surface, NULL);
else
xdg_surface_unset_fullscreen(window->xdg_surface);
}
int
@ -4166,10 +4175,10 @@ window_set_maximized(struct window *window, int maximized)
if (window->maximized == maximized)
return;
xdg_surface_request_change_state(window->xdg_surface,
XDG_SURFACE_STATE_MAXIMIZED,
maximized ? 1 : 0,
0);
if (maximized)
xdg_surface_set_maximized(window->xdg_surface);
else
xdg_surface_unset_maximized(window->xdg_surface);
}
void

142
desktop-shell/shell.c
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@ -3418,86 +3418,73 @@ xdg_surface_resize(struct wl_client *client, struct wl_resource *resource,
}
static void
xdg_surface_set_output(struct wl_client *client,
xdg_surface_ack_configure(struct wl_client *client,
struct wl_resource *resource,
struct wl_resource *output_resource)
uint32_t serial)
{
struct shell_surface *shsurf = wl_resource_get_user_data(resource);
struct weston_output *output;
if (output_resource)
output = wl_resource_get_user_data(output_resource);
else
output = NULL;
shsurf->recommended_output = output;
if (shsurf->state_requested) {
shsurf->next_state = shsurf->requested_state;
shsurf->state_changed = true;
shsurf->state_requested = false;
}
}
static void
xdg_surface_change_state(struct shell_surface *shsurf,
uint32_t state, uint32_t value, uint32_t serial)
xdg_surface_set_maximized(struct wl_client *client,
struct wl_resource *resource)
{
xdg_surface_send_change_state(shsurf->resource, state, value, serial);
shsurf->state_requested = true;
struct shell_surface *shsurf = wl_resource_get_user_data(resource);
switch (state) {
case XDG_SURFACE_STATE_MAXIMIZED:
shsurf->requested_state.maximized = value;
if (value)
shsurf->state_requested = true;
shsurf->requested_state.maximized = true;
set_maximized(shsurf, NULL);
break;
case XDG_SURFACE_STATE_FULLSCREEN:
shsurf->requested_state.fullscreen = value;
}
if (value)
set_fullscreen(shsurf,
WL_SHELL_SURFACE_FULLSCREEN_METHOD_DEFAULT,
0, shsurf->recommended_output);
break;
}
static void
xdg_surface_unset_maximized(struct wl_client *client,
struct wl_resource *resource)
{
struct shell_surface *shsurf = wl_resource_get_user_data(resource);
shsurf->state_requested = true;
shsurf->requested_state.maximized = false;
shsurf->client->send_configure(shsurf->surface, 0, 0);
}
static void
xdg_surface_request_change_state(struct wl_client *client,
xdg_surface_set_fullscreen(struct wl_client *client,
struct wl_resource *resource,
uint32_t state,
uint32_t value,
uint32_t serial)
struct wl_resource *output_resource)
{
struct shell_surface *shsurf = wl_resource_get_user_data(resource);
struct weston_output *output;
/* The client can't know what the current state is, so we need
to always send a state change in response. */
shsurf->state_requested = true;
shsurf->requested_state.fullscreen = true;
if (shsurf->type != SHELL_SURFACE_TOPLEVEL)
return;
if (output_resource)
output = wl_resource_get_user_data(output_resource);
else
output = NULL;
switch (state) {
case XDG_SURFACE_STATE_MAXIMIZED:
case XDG_SURFACE_STATE_FULLSCREEN:
break;
default:
/* send error? ignore? send change state with value 0? */
return;
}
shsurf->recommended_output = output;
xdg_surface_change_state(shsurf, state, value, serial);
set_fullscreen(shsurf,
WL_SHELL_SURFACE_FULLSCREEN_METHOD_DEFAULT,
0, shsurf->recommended_output);
}
static void
xdg_surface_ack_change_state(struct wl_client *client,
struct wl_resource *resource,
uint32_t state,
uint32_t value,
uint32_t serial)
xdg_surface_unset_fullscreen(struct wl_client *client,
struct wl_resource *resource)
{
struct shell_surface *shsurf = wl_resource_get_user_data(resource);
if (shsurf->state_requested) {
shsurf->next_state = shsurf->requested_state;
shsurf->state_changed = true;
shsurf->state_requested = false;
}
shsurf->state_requested = true;
shsurf->requested_state.fullscreen = false;
shsurf->client->send_configure(shsurf->surface, 0, 0);
}
static void
@ -3521,10 +3508,12 @@ static const struct xdg_surface_interface xdg_surface_implementation = {
xdg_surface_set_app_id,
xdg_surface_move,
xdg_surface_resize,
xdg_surface_set_output,
xdg_surface_request_change_state,
xdg_surface_ack_change_state,
xdg_surface_set_minimized
xdg_surface_ack_configure,
xdg_surface_set_maximized,
xdg_surface_unset_maximized,
xdg_surface_set_fullscreen,
xdg_surface_unset_fullscreen,
xdg_surface_set_minimized,
};
static void
@ -3532,11 +3521,28 @@ xdg_send_configure(struct weston_surface *surface,
int32_t width, int32_t height)
{
struct shell_surface *shsurf = get_shell_surface(surface);
uint32_t *s;
struct wl_array states;
uint32_t serial;
assert(shsurf);
if (shsurf->resource)
xdg_surface_send_configure(shsurf->resource, width, height);
if (!shsurf->resource)
return;
wl_array_init(&states);
if (shsurf->requested_state.fullscreen) {
s = wl_array_add(&states, sizeof *s);
*s = XDG_SURFACE_STATE_FULLSCREEN;
} else if (shsurf->requested_state.maximized) {
s = wl_array_add(&states, sizeof *s);
*s = XDG_SURFACE_STATE_MAXIMIZED;
}
serial = wl_display_next_serial(shsurf->surface->compositor->wl_display);
xdg_surface_send_configure(shsurf->resource, width, height, &states, serial);
wl_array_release(&states);
}
static const struct weston_shell_client xdg_client = {
@ -4107,7 +4113,6 @@ maximize_binding(struct weston_seat *seat, uint32_t time, uint32_t button, void
struct weston_surface *focus = seat->keyboard->focus;
struct weston_surface *surface;
struct shell_surface *shsurf;
uint32_t serial;
surface = weston_surface_get_main_surface(focus);
if (surface == NULL)
@ -4120,9 +4125,10 @@ maximize_binding(struct weston_seat *seat, uint32_t time, uint32_t button, void
if (!shell_surface_is_xdg_surface(shsurf))
return;
serial = wl_display_next_serial(seat->compositor->wl_display);
xdg_surface_change_state(shsurf, XDG_SURFACE_STATE_MAXIMIZED,
!shsurf->state.maximized, serial);
shsurf->state_requested = true;
shsurf->requested_state.maximized = !shsurf->state.maximized;
if (shsurf->requested_state.maximized)
set_maximized(shsurf, NULL);
}
static void
@ -4131,7 +4137,6 @@ fullscreen_binding(struct weston_seat *seat, uint32_t time, uint32_t button, voi
struct weston_surface *focus = seat->keyboard->focus;
struct weston_surface *surface;
struct shell_surface *shsurf;
uint32_t serial;
surface = weston_surface_get_main_surface(focus);
if (surface == NULL)
@ -4144,9 +4149,12 @@ fullscreen_binding(struct weston_seat *seat, uint32_t time, uint32_t button, voi
if (!shell_surface_is_xdg_surface(shsurf))
return;
serial = wl_display_next_serial(seat->compositor->wl_display);
xdg_surface_change_state(shsurf, XDG_SURFACE_STATE_FULLSCREEN,
!shsurf->state.fullscreen, serial);
shsurf->state_requested = true;
shsurf->requested_state.fullscreen = !shsurf->state.fullscreen;
if (shsurf->requested_state.fullscreen)
set_fullscreen(shsurf,
WL_SHELL_SURFACE_FULLSCREEN_METHOD_DEFAULT,
0, shsurf->recommended_output);
}
static void

118
protocol/xdg-shell.xml
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@ -241,40 +241,6 @@
<arg name="edges" type="uint" summary="which edge or corner is being dragged"/>
</request>
<event name="configure">
<description summary="suggest resize">
The configure event asks the client to resize its surface.
The size is a hint, in the sense that the client is free to
ignore it if it doesn't resize, pick a smaller size (to
satisfy aspect ratio or resize in steps of NxM pixels).
The client is free to dismiss all but the last configure
event it received.
The width and height arguments specify the size of the window
in surface local coordinates.
</description>
<arg name="width" type="int"/>
<arg name="height" type="int"/>
</event>
<request name="set_output">
<description summary="set the default output used by this surface">
Set the default output used by this surface when it is first mapped.
If this value is NULL (default), it's up to the compositor to choose
which display will be used to map this surface.
When fullscreen or maximized state are set on this surface, and it
wasn't mapped yet, the output set with this method will be used.
Otherwise, the output where the surface is currently mapped will be
used.
</description>
<arg name="output" type="object" interface="wl_output" allow-null="true"/>
</request>
<enum name="state">
<description summary="types of state on the surface">
The different state values used on the surface. This is designed for
@ -297,67 +263,67 @@
0x1000 - 0x1FFF: GNOME
</description>
<entry name="maximized" value="1" summary="the surface is maximized">
A non-zero value indicates the surface is maximized. Otherwise,
the surface is unmaximized.
The surface is maximized. The window geometry specified in the configure
event must be obeyed by the client.
</entry>
<entry name="fullscreen" value="2" summary="the surface is fullscreen">
A non-zero value indicates the surface is fullscreen. Otherwise,
the surface is not fullscreen.
The surface is fullscreen. The window geometry specified in the configure
event must be obeyed by the client.
</entry>
</enum>
<request name="request_change_state">
<description summary="client requests to change a surface's state">
This asks the compositor to change the state. If the compositor wants
to change the state, it will send a change_state event with the same
state_type, value, and serial, and the event flow continues as if it
it was initiated by the compositor.
<event name="configure">
<description summary="suggest a surface chnage">
The configure event asks the client to resize its surface.
The width and height arguments specify a hint to the window
about how its surface should be resized in surface local
coordinates. The states listed in the event specify how the
width/height arguments should be interpreted.
If the compositor does not want to change the state, it will send a
change_state to the client with the old value of the state.
</description>
<arg name="state_type" type="uint" summary="the state to set"/>
<arg name="value" type="uint" summary="the value to change the state to"/>
<arg name="serial" type="uint" summary="an event serial">
This serial is so the client can know which change_state event corresponds
to which request_change_state request it sent out.
</arg>
</request>
A client should arrange a new surface, and then send a
ack_configure request with the serial sent in this configure
event before attaching a new surface.
<event name="change_state">
<description summary="compositor wants to change a surface's state">
This event tells the client to change a surface's state. The client
should respond with an ack_change_state request to the compositor to
guarantee that the compositor knows that the client has seen it.
If the client receives multiple configure events before it
can respond to one, it is free to discard all but the last
event it received.
</description>
<arg name="state_type" type="uint" summary="the state to set"/>
<arg name="value" type="uint" summary="the value to change the state to"/>
<arg name="serial" type="uint" summary="a serial for the compositor's own tracking"/>
<arg name="width" type="int"/>
<arg name="height" type="int"/>
<arg name="states" type="array"/>
<arg name="serial" type="uint"/>
</event>
<request name="ack_change_state">
<description summary="ack a change_state event">
When a change_state event is received, a client should then ack it
using the ack_change_state request to ensure that the compositor
<request name="ack_configure">
<description summary="ack a configure event">
When a configure event is received, a client should then ack it
using the ack_configure request to ensure that the compositor
knows the client has seen the event.
By this point, the state is confirmed, and the next attach should
contain the buffer drawn for the new state value.
The values here need to be the same as the values in the cooresponding
change_state event.
contain the buffer drawn for the configure event you are acking.
</description>
<arg name="state_type" type="uint" summary="the state to set"/>
<arg name="value" type="uint" summary="the value to change the state to"/>
<arg name="serial" type="uint" summary="a serial to pass to change_state"/>
<arg name="serial" type="uint" summary="a serial to configure for"/>
</request>
<request name="set_minimized">
<description summary="minimize the surface">
Minimize the surface.
<request name="set_maximized" />
<request name="unset_maximized" />
<request name="set_fullscreen">
<description summary="set the window as fullscreen on a monitor">
Make the surface fullscreen.
You can specify an output that you would prefer to be fullscreen.
If this value is NULL, it's up to the compositor to choose which
display will be used to map this surface.
</description>
<arg name="output" type="object" interface="wl_output" allow-null="true"/>
</request>
<request name="unset_fullscreen" />
<request name="set_minimized" />
<event name="activated">
<description summary="surface was activated">

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