protocols: Add toplevel mapping protocol (#16)

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<?xml version="1.0" encoding="UTF-8"?>
<protocol name="hyprland_toplevel_mapping_v1">
<copyright>
Copyright © 2025 WhySoBad
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
3. Neither the name of the copyright holder nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
</copyright>
<description summary="mapping of toplevels to windows">
This protocol allows clients to retrieve the mapping of toplevels to hyprland window addresses.
</description>
<interface name="hyprland_toplevel_mapping_manager_v1" version="1">
<description summary="manager to request toplevel mappings">
This object is a manager which offers requests to retrieve a window address
for a toplevel.
</description>
<request name="get_window_for_toplevel">
<description summary="get window address for toplevel">
Get the window address for a toplevel.
</description>
<arg
name="handle"
type="new_id"
interface="hyprland_toplevel_window_mapping_handle_v1"
/>
<arg
name="toplevel"
type="object"
interface="ext_foreign_toplevel_handle_v1"
summary="toplevel to get the window address for"
/>
</request>
<request name="get_window_for_toplevel_wlr">
<description summary="get window address for wlr toplevel">
Get the window address for a wlr toplevel.
</description>
<arg
name="handle"
type="new_id"
interface="hyprland_toplevel_window_mapping_handle_v1"
/>
<arg
name="toplevel"
type="object"
interface="zwlr_foreign_toplevel_handle_v1"
summary="wlr toplevel to get the window address for"
/>
</request>
<request name="destroy" type="destructor">
<description summary="destroy the manager">
All objects created by the manager will still remain valid, until their appropriate destroy
request has been called.
</description>
</request>
</interface>
<interface name="hyprland_toplevel_window_mapping_handle_v1" version="1">
<description summary="toplevel to window mapping">
This object represents a mapping of a (wlr) toplevel to a window address.
Once created, the `window_address` event will be sent containing the address of the window
associated with the toplevel.
Should the mapping fail, the `failed` event will be sent.
</description>
<event name="window_address">
<description summary="address of the window">
The full 64bit window address. The `address` field contains the lower 32 bits whilst the
`address_hi` contains the upper 32 bits
</description>
<arg
name="address_hi"
type="uint"
summary="upper 32 bits of the window address"
/>
<arg
name="address"
type="uint"
summary="lower 32 bits of the window address"
/>
</event>
<event name="failed">
<description summary="mapping failed">
The mapping of the toplevel to a window address failed. Most likely the window does not
exist (anymore).
</description>
</event>
<request name="destroy" type="destructor">
<description summary="destroy handle">
Destroy the handle. This request can be sent at any time by the client.
</description>
</request>
</interface>
</protocol>