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Midgard 2022-09-06 23:36:03 +02:00
commit 103dcf9e69
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GPG key ID: 511C112F1331BBB4
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.gitignore vendored Normal file
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build/
*-protocol.h

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.ycm_extra_conf.py Normal file
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# Generated by YCM Generator at 2022-09-07 00:00:45.256036
# This file is NOT licensed under the GPLv3, which is the license for the rest
# of YouCompleteMe.
#
# Here's the license text for this file:
#
# This is free and unencumbered software released into the public domain.
#
# Anyone is free to copy, modify, publish, use, compile, sell, or
# distribute this software, either in source code form or as a compiled
# binary, for any purpose, commercial or non-commercial, and by any
# means.
#
# In jurisdictions that recognize copyright laws, the author or authors
# of this software dedicate any and all copyright interest in the
# software to the public domain. We make this dedication for the benefit
# of the public at large and to the detriment of our heirs and
# successors. We intend this dedication to be an overt act of
# relinquishment in perpetuity of all present and future rights to this
# software under copyright law.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
# IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
# OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
# ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
# OTHER DEALINGS IN THE SOFTWARE.
#
# For more information, please refer to <http://unlicense.org/>
import os
import ycm_core
flags = [
'-x',
'c',
'-Wall',
]
# Set this to the absolute path to the folder (NOT the file!) containing the
# compile_commands.json file to use that instead of 'flags'. See here for
# more details: http://clang.llvm.org/docs/JSONCompilationDatabase.html
#
# You can get CMake to generate this file for you by adding:
# set( CMAKE_EXPORT_COMPILE_COMMANDS 1 )
# to your CMakeLists.txt file.
#
# Most projects will NOT need to set this to anything; you can just change the
# 'flags' list of compilation flags. Notice that YCM itself uses that approach.
compilation_database_folder = ''
if os.path.exists( compilation_database_folder ):
database = ycm_core.CompilationDatabase( compilation_database_folder )
else:
database = None
SOURCE_EXTENSIONS = [ '.C', '.cpp', '.cxx', '.cc', '.c', '.m', '.mm' ]
def DirectoryOfThisScript():
return os.path.dirname( os.path.abspath( __file__ ) )
def MakeRelativePathsInFlagsAbsolute( flags, working_directory ):
if not working_directory:
return list( flags )
new_flags = []
make_next_absolute = False
path_flags = [ '-isystem', '-I', '-iquote', '--sysroot=' ]
for flag in flags:
new_flag = flag
if make_next_absolute:
make_next_absolute = False
if not flag.startswith( '/' ):
new_flag = os.path.join( working_directory, flag )
for path_flag in path_flags:
if flag == path_flag:
make_next_absolute = True
break
if flag.startswith( path_flag ):
path = flag[ len( path_flag ): ]
new_flag = path_flag + os.path.join( working_directory, path )
break
if new_flag:
new_flags.append( new_flag )
return new_flags
def IsHeaderFile( filename ):
extension = os.path.splitext( filename )[ 1 ]
return extension in [ '.H', '.h', '.hxx', '.hpp', '.hh' ]
def GetCompilationInfoForFile( filename ):
# The compilation_commands.json file generated by CMake does not have entries
# for header files. So we do our best by asking the db for flags for a
# corresponding source file, if any. If one exists, the flags for that file
# should be good enough.
if IsHeaderFile( filename ):
basename = os.path.splitext( filename )[ 0 ]
for extension in SOURCE_EXTENSIONS:
replacement_file = basename + extension
if os.path.exists( replacement_file ):
compilation_info = database.GetCompilationInfoForFile(
replacement_file )
if compilation_info.compiler_flags_:
return compilation_info
return None
return database.GetCompilationInfoForFile( filename )
def FlagsForFile( filename, **kwargs ):
if database:
# Bear in mind that compilation_info.compiler_flags_ does NOT return a
# python list, but a "list-like" StringVec object
compilation_info = GetCompilationInfoForFile( filename )
if not compilation_info:
return None
final_flags = MakeRelativePathsInFlagsAbsolute(
compilation_info.compiler_flags_,
compilation_info.compiler_working_dir_ )
else:
relative_to = DirectoryOfThisScript()
final_flags = MakeRelativePathsInFlagsAbsolute( flags, relative_to )
return {
'flags': final_flags,
'do_cache': True
}

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BUILD = build
CFLAGS += -Wall
LDLIBS = -lwayland-client -lrt -lcairo
$(shell mkdir -p $(BUILD))
.PHONY: all clean
all: build/wl-overlay
clean:
rm -rf $(BUILD)/*
xdg-shell-client-protocol.h: /usr/share/wayland-protocols/stable/xdg-shell/xdg-shell.xml
wayland-scanner client-header < "$^" > "$@"
build/xdg-shell-protocol.c: /usr/share/wayland-protocols/stable/xdg-shell/xdg-shell.xml
wayland-scanner private-code < "$^" > "$@"
wlr-layer-shell-protocol.h: wlr-layer-shell-unstable-v1.xml
wayland-scanner client-header < "$^" > "$@"
build/wlr-layer-shell-protocol.c: wlr-layer-shell-unstable-v1.xml
wayland-scanner private-code < "$^" > "$@"
C_FILES = wl-overlay.c build/xdg-shell-protocol.c build/wlr-layer-shell-protocol.c
build/wl-overlay: $(C_FILES) xdg-shell-client-protocol.h wlr-layer-shell-protocol.h
$(CC) $(CFLAGS) $(LDLIBS) -o "$@" $(C_FILES)

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#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <time.h>
#include <unistd.h>
#include <wayland-client.h>
#include <cairo/cairo.h>
#include "wlr-layer-shell-protocol.h"
/* Shared memory support code */
static void
randname(char *buf)
{
struct timespec ts;
clock_gettime(CLOCK_REALTIME, &ts);
long r = ts.tv_nsec;
for (int i = 0; i < 6; ++i) {
buf[i] = 'A'+(r&15)+(r&16)*2;
r >>= 5;
}
}
static int
create_shm_file(void)
{
int retries = 100;
do {
char name[] = "/wl_shm-XXXXXX";
randname(name + sizeof(name) - 7);
--retries;
int fd = shm_open(name, O_RDWR | O_CREAT | O_EXCL, 0600);
if (fd >= 0) {
shm_unlink(name);
return fd;
}
} while (retries > 0 && errno == EEXIST);
return -1;
}
static int
allocate_shm_file(size_t size)
{
int fd = create_shm_file();
if (fd < 0)
return -1;
int ret;
do {
ret = ftruncate(fd, size);
} while (ret < 0 && errno == EINTR);
if (ret < 0) {
close(fd);
return -1;
}
return fd;
}
/* Wayland code */
struct client_state {
char *filename;
/* Globals */
struct wl_display *wl_display;
struct wl_registry *wl_registry;
struct wl_shm *wl_shm;
struct wl_compositor *wl_compositor;
/* Objects */
struct zwlr_layer_shell_v1 *layer_shell;
struct wl_surface *wl_surface;
struct zwlr_layer_surface_v1 *zwlr_surface;
};
static void
wl_buffer_release(void *data, struct wl_buffer *wl_buffer)
{
/* Sent by the compositor when it's no longer using this buffer */
wl_buffer_destroy(wl_buffer);
}
static const struct wl_buffer_listener wl_buffer_listener = {
.release = wl_buffer_release,
};
static struct wl_buffer *
draw_frame(struct client_state *state, const int width, const int height)
{
int stride = width * 4;
int size = stride * height;
int fd = allocate_shm_file(size);
if (fd == -1) {
return NULL;
}
uint32_t *data = mmap(NULL, size,
PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
if (data == MAP_FAILED) {
close(fd);
return NULL;
}
struct wl_shm_pool *pool = wl_shm_create_pool(state->wl_shm, fd, size);
struct wl_buffer *buffer = wl_shm_pool_create_buffer(pool, 0,
width, height, stride, WL_SHM_FORMAT_ARGB8888);
wl_shm_pool_destroy(pool);
close(fd);
/* Load PNG */
cairo_surface_t *cairo_target_surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, width, height);
cairo_t *cairo = cairo_create(cairo_target_surface);
memset(cairo_image_surface_get_data(cairo_target_surface), 0, size);
cairo_surface_t *cairo_png_surface = cairo_image_surface_create_from_png(state->filename);
if (cairo_surface_status(cairo_png_surface) != CAIRO_STATUS_SUCCESS) {
fprintf(stderr, "Failed to open PNG image.\n");
exit(1);
}
cairo_set_source_surface(cairo, cairo_png_surface, 0.0, 0.0);
cairo_paint(cairo);
memcpy(data, cairo_image_surface_get_data(cairo_target_surface), size);
cairo_surface_destroy(cairo_png_surface);
cairo_surface_destroy(cairo_target_surface);
cairo_destroy(cairo);
munmap(data, size);
wl_buffer_add_listener(buffer, &wl_buffer_listener, NULL);
return buffer;
}
static void
zwlr_layer_surface_configure(void *data,
struct zwlr_layer_surface_v1 *zwlr_layer_surface_v1,
uint32_t serial, uint32_t width, uint32_t height)
{
struct client_state *state = data;
zwlr_layer_surface_v1_ack_configure(zwlr_layer_surface_v1, serial);
struct wl_buffer *buffer = draw_frame(state, width, height);
wl_surface_attach(state->wl_surface, buffer, 0, 0);
wl_surface_commit(state->wl_surface);
}
static const struct zwlr_layer_surface_v1_listener zwlr_layer_surface_listener = {
.configure = zwlr_layer_surface_configure,
};
static void
registry_global(void *data, struct wl_registry *wl_registry,
uint32_t name, const char *interface, uint32_t version)
{
struct client_state *state = data;
if (strcmp(interface, wl_shm_interface.name) == 0) {
state->wl_shm = wl_registry_bind(
wl_registry, name, &wl_shm_interface, 1);
} else if (strcmp(interface, wl_compositor_interface.name) == 0) {
state->wl_compositor = wl_registry_bind(
wl_registry, name, &wl_compositor_interface, 4);
} else if (strcmp(interface, zwlr_layer_shell_v1_interface.name) == 0) {
state->layer_shell = wl_registry_bind(
wl_registry, name, &zwlr_layer_shell_v1_interface, 1);
}
}
static void
registry_global_remove(void *data,
struct wl_registry *wl_registry, uint32_t name)
{
/* This space deliberately left blank */
}
static const struct wl_registry_listener wl_registry_listener = {
.global = registry_global,
.global_remove = registry_global_remove,
};
int
main(int argc, char *argv[])
{
struct client_state state = { 0 };
if (argc < 2 || strcmp("-h", argv[1]) == 0 || strcmp("--help", argv[1]) == 0) {
fprintf(stderr, "Usage: wl-overlay <image.png>\n\nThe image must be a 256×256 PNG with ARGB.\n");
return 1;
}
state.filename = strdup(argv[1]);
state.wl_display = wl_display_connect(NULL);
if (!state.wl_display) {
fprintf(stderr, "Could not connect to Wayland server\n");
return 1;
}
state.wl_registry = wl_display_get_registry(state.wl_display);
wl_registry_add_listener(state.wl_registry, &wl_registry_listener, &state);
wl_display_roundtrip(state.wl_display);
state.wl_surface = wl_compositor_create_surface(state.wl_compositor);
state.zwlr_surface = zwlr_layer_shell_v1_get_layer_surface(
state.layer_shell, state.wl_surface, NULL, ZWLR_LAYER_SHELL_V1_LAYER_OVERLAY, "wl-overlay");
zwlr_layer_surface_v1_set_size(state.zwlr_surface, 256, 256);
zwlr_layer_surface_v1_set_anchor(state.zwlr_surface, ZWLR_LAYER_SURFACE_V1_ANCHOR_BOTTOM);
zwlr_layer_surface_v1_set_margin(state.zwlr_surface, 50, 50, 50, 50);
zwlr_layer_surface_v1_add_listener(state.zwlr_surface, &zwlr_layer_surface_listener, &state);
wl_surface_commit(state.wl_surface);
while (wl_display_dispatch(state.wl_display)) {
/* This space deliberately left blank */
}
free(state.filename);
return 0;
}

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<?xml version="1.0" encoding="UTF-8"?>
<protocol name="wlr_layer_shell_unstable_v1">
<copyright>
Copyright © 2017 Drew DeVault
Permission to use, copy, modify, distribute, and sell this
software and its documentation for any purpose is hereby granted
without fee, provided that the above copyright notice appear in
all copies and that both that copyright notice and this permission
notice appear in supporting documentation, and that the name of
the copyright holders not be used in advertising or publicity
pertaining to distribution of the software without specific,
written prior permission. The copyright holders make no
representations about the suitability of this software for any
purpose. It is provided "as is" without express or implied
warranty.
THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
THIS SOFTWARE.
</copyright>
<interface name="zwlr_layer_shell_v1" version="4">
<description summary="create surfaces that are layers of the desktop">
Clients can use this interface to assign the surface_layer role to
wl_surfaces. Such surfaces are assigned to a "layer" of the output and
rendered with a defined z-depth respective to each other. They may also be
anchored to the edges and corners of a screen and specify input handling
semantics. This interface should be suitable for the implementation of
many desktop shell components, and a broad number of other applications
that interact with the desktop.
</description>
<request name="get_layer_surface">
<description summary="create a layer_surface from a surface">
Create a layer surface for an existing surface. This assigns the role of
layer_surface, or raises a protocol error if another role is already
assigned.
Creating a layer surface from a wl_surface which has a buffer attached
or committed is a client error, and any attempts by a client to attach
or manipulate a buffer prior to the first layer_surface.configure call
must also be treated as errors.
After creating a layer_surface object and setting it up, the client
must perform an initial commit without any buffer attached.
The compositor will reply with a layer_surface.configure event.
The client must acknowledge it and is then allowed to attach a buffer
to map the surface.
You may pass NULL for output to allow the compositor to decide which
output to use. Generally this will be the one that the user most
recently interacted with.
Clients can specify a namespace that defines the purpose of the layer
surface.
</description>
<arg name="id" type="new_id" interface="zwlr_layer_surface_v1"/>
<arg name="surface" type="object" interface="wl_surface"/>
<arg name="output" type="object" interface="wl_output" allow-null="true"/>
<arg name="layer" type="uint" enum="layer" summary="layer to add this surface to"/>
<arg name="namespace" type="string" summary="namespace for the layer surface"/>
</request>
<enum name="error">
<entry name="role" value="0" summary="wl_surface has another role"/>
<entry name="invalid_layer" value="1" summary="layer value is invalid"/>
<entry name="already_constructed" value="2" summary="wl_surface has a buffer attached or committed"/>
</enum>
<enum name="layer">
<description summary="available layers for surfaces">
These values indicate which layers a surface can be rendered in. They
are ordered by z depth, bottom-most first. Traditional shell surfaces
will typically be rendered between the bottom and top layers.
Fullscreen shell surfaces are typically rendered at the top layer.
Multiple surfaces can share a single layer, and ordering within a
single layer is undefined.
</description>
<entry name="background" value="0"/>
<entry name="bottom" value="1"/>
<entry name="top" value="2"/>
<entry name="overlay" value="3"/>
</enum>
<!-- Version 3 additions -->
<request name="destroy" type="destructor" since="3">
<description summary="destroy the layer_shell object">
This request indicates that the client will not use the layer_shell
object any more. Objects that have been created through this instance
are not affected.
</description>
</request>
</interface>
<interface name="zwlr_layer_surface_v1" version="4">
<description summary="layer metadata interface">
An interface that may be implemented by a wl_surface, for surfaces that
are designed to be rendered as a layer of a stacked desktop-like
environment.
Layer surface state (layer, size, anchor, exclusive zone,
margin, interactivity) is double-buffered, and will be applied at the
time wl_surface.commit of the corresponding wl_surface is called.
Attaching a null buffer to a layer surface unmaps it.
Unmapping a layer_surface means that the surface cannot be shown by the
compositor until it is explicitly mapped again. The layer_surface
returns to the state it had right after layer_shell.get_layer_surface.
The client can re-map the surface by performing a commit without any
buffer attached, waiting for a configure event and handling it as usual.
</description>
<request name="set_size">
<description summary="sets the size of the surface">
Sets the size of the surface in surface-local coordinates. The
compositor will display the surface centered with respect to its
anchors.
If you pass 0 for either value, the compositor will assign it and
inform you of the assignment in the configure event. You must set your
anchor to opposite edges in the dimensions you omit; not doing so is a
protocol error. Both values are 0 by default.
Size is double-buffered, see wl_surface.commit.
</description>
<arg name="width" type="uint"/>
<arg name="height" type="uint"/>
</request>
<request name="set_anchor">
<description summary="configures the anchor point of the surface">
Requests that the compositor anchor the surface to the specified edges
and corners. If two orthogonal edges are specified (e.g. 'top' and
'left'), then the anchor point will be the intersection of the edges
(e.g. the top left corner of the output); otherwise the anchor point
will be centered on that edge, or in the center if none is specified.
Anchor is double-buffered, see wl_surface.commit.
</description>
<arg name="anchor" type="uint" enum="anchor"/>
</request>
<request name="set_exclusive_zone">
<description summary="configures the exclusive geometry of this surface">
Requests that the compositor avoids occluding an area with other
surfaces. The compositor's use of this information is
implementation-dependent - do not assume that this region will not
actually be occluded.
A positive value is only meaningful if the surface is anchored to one
edge or an edge and both perpendicular edges. If the surface is not
anchored, anchored to only two perpendicular edges (a corner), anchored
to only two parallel edges or anchored to all edges, a positive value
will be treated the same as zero.
A positive zone is the distance from the edge in surface-local
coordinates to consider exclusive.
Surfaces that do not wish to have an exclusive zone may instead specify
how they should interact with surfaces that do. If set to zero, the
surface indicates that it would like to be moved to avoid occluding
surfaces with a positive exclusive zone. If set to -1, the surface
indicates that it would not like to be moved to accommodate for other
surfaces, and the compositor should extend it all the way to the edges
it is anchored to.
For example, a panel might set its exclusive zone to 10, so that
maximized shell surfaces are not shown on top of it. A notification
might set its exclusive zone to 0, so that it is moved to avoid
occluding the panel, but shell surfaces are shown underneath it. A
wallpaper or lock screen might set their exclusive zone to -1, so that
they stretch below or over the panel.
The default value is 0.
Exclusive zone is double-buffered, see wl_surface.commit.
</description>
<arg name="zone" type="int"/>
</request>
<request name="set_margin">
<description summary="sets a margin from the anchor point">
Requests that the surface be placed some distance away from the anchor
point on the output, in surface-local coordinates. Setting this value
for edges you are not anchored to has no effect.
The exclusive zone includes the margin.
Margin is double-buffered, see wl_surface.commit.
</description>
<arg name="top" type="int"/>
<arg name="right" type="int"/>
<arg name="bottom" type="int"/>
<arg name="left" type="int"/>
</request>
<enum name="keyboard_interactivity">
<description summary="types of keyboard interaction possible for a layer shell surface">
Types of keyboard interaction possible for layer shell surfaces. The
rationale for this is twofold: (1) some applications are not interested
in keyboard events and not allowing them to be focused can improve the
desktop experience; (2) some applications will want to take exclusive
keyboard focus.
</description>
<entry name="none" value="0">
<description summary="no keyboard focus is possible">
This value indicates that this surface is not interested in keyboard
events and the compositor should never assign it the keyboard focus.
This is the default value, set for newly created layer shell surfaces.
This is useful for e.g. desktop widgets that display information or
only have interaction with non-keyboard input devices.
</description>
</entry>
<entry name="exclusive" value="1">
<description summary="request exclusive keyboard focus">
Request exclusive keyboard focus if this surface is above the shell surface layer.
For the top and overlay layers, the seat will always give
exclusive keyboard focus to the top-most layer which has keyboard
interactivity set to exclusive. If this layer contains multiple
surfaces with keyboard interactivity set to exclusive, the compositor
determines the one receiving keyboard events in an implementation-
defined manner. In this case, no guarantee is made when this surface
will receive keyboard focus (if ever).
For the bottom and background layers, the compositor is allowed to use
normal focus semantics.
This setting is mainly intended for applications that need to ensure
they receive all keyboard events, such as a lock screen or a password
prompt.
</description>
</entry>
<entry name="on_demand" value="2" since="4">
<description summary="request regular keyboard focus semantics">
This requests the compositor to allow this surface to be focused and
unfocused by the user in an implementation-defined manner. The user
should be able to unfocus this surface even regardless of the layer
it is on.
Typically, the compositor will want to use its normal mechanism to
manage keyboard focus between layer shell surfaces with this setting
and regular toplevels on the desktop layer (e.g. click to focus).
Nevertheless, it is possible for a compositor to require a special
interaction to focus or unfocus layer shell surfaces (e.g. requiring
a click even if focus follows the mouse normally, or providing a
keybinding to switch focus between layers).
This setting is mainly intended for desktop shell components (e.g.
panels) that allow keyboard interaction. Using this option can allow
implementing a desktop shell that can be fully usable without the
mouse.
</description>
</entry>
</enum>
<request name="set_keyboard_interactivity">
<description summary="requests keyboard events">
Set how keyboard events are delivered to this surface. By default,
layer shell surfaces do not receive keyboard events; this request can
be used to change this.
This setting is inherited by child surfaces set by the get_popup
request.
Layer surfaces receive pointer, touch, and tablet events normally. If
you do not want to receive them, set the input region on your surface
to an empty region.
Keyboard interactivity is double-buffered, see wl_surface.commit.
</description>
<arg name="keyboard_interactivity" type="uint" enum="keyboard_interactivity"/>
</request>
<request name="get_popup">
<description summary="assign this layer_surface as an xdg_popup parent">
This assigns an xdg_popup's parent to this layer_surface. This popup
should have been created via xdg_surface::get_popup with the parent set
to NULL, and this request must be invoked before committing the popup's
initial state.
See the documentation of xdg_popup for more details about what an
xdg_popup is and how it is used.
</description>
<arg name="popup" type="object" interface="xdg_popup"/>
</request>
<request name="ack_configure">
<description summary="ack a configure event">
When a configure event is received, if a client commits the
surface in response to the configure event, then the client
must make an ack_configure request sometime before the commit
request, passing along the serial of the configure event.
If the client receives multiple configure events before it
can respond to one, it only has to ack the last configure event.
A client is not required to commit immediately after sending
an ack_configure request - it may even ack_configure several times
before its next surface commit.
A client may send multiple ack_configure requests before committing, but
only the last request sent before a commit indicates which configure
event the client really is responding to.
</description>
<arg name="serial" type="uint" summary="the serial from the configure event"/>
</request>
<request name="destroy" type="destructor">
<description summary="destroy the layer_surface">
This request destroys the layer surface.
</description>
</request>
<event name="configure">
<description summary="suggest a surface change">
The configure event asks the client to resize its surface.
Clients should arrange their surface for the new states, and then send
an ack_configure request with the serial sent in this configure event at
some point before committing the new surface.
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.
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). If the client picks a smaller size and
is anchored to two opposite anchors (e.g. 'top' and 'bottom'), the
surface will be centered on this axis.
If the width or height arguments are zero, it means the client should
decide its own window dimension.
</description>
<arg name="serial" type="uint"/>
<arg name="width" type="uint"/>
<arg name="height" type="uint"/>
</event>
<event name="closed">
<description summary="surface should be closed">
The closed event is sent by the compositor when the surface will no
longer be shown. The output may have been destroyed or the user may
have asked for it to be removed. Further changes to the surface will be
ignored. The client should destroy the resource after receiving this
event, and create a new surface if they so choose.
</description>
</event>
<enum name="error">
<entry name="invalid_surface_state" value="0" summary="provided surface state is invalid"/>
<entry name="invalid_size" value="1" summary="size is invalid"/>
<entry name="invalid_anchor" value="2" summary="anchor bitfield is invalid"/>
<entry name="invalid_keyboard_interactivity" value="3" summary="keyboard interactivity is invalid"/>
</enum>
<enum name="anchor" bitfield="true">
<entry name="top" value="1" summary="the top edge of the anchor rectangle"/>
<entry name="bottom" value="2" summary="the bottom edge of the anchor rectangle"/>
<entry name="left" value="4" summary="the left edge of the anchor rectangle"/>
<entry name="right" value="8" summary="the right edge of the anchor rectangle"/>
</enum>
<!-- Version 2 additions -->
<request name="set_layer" since="2">
<description summary="change the layer of the surface">
Change the layer that the surface is rendered on.
Layer is double-buffered, see wl_surface.commit.
</description>
<arg name="layer" type="uint" enum="zwlr_layer_shell_v1.layer" summary="layer to move this surface to"/>
</request>
</interface>
</protocol>