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<?xml version="1.0" encoding="UTF-8"?>
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<protocol name="xdg_output_unstable_v1">
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<copyright>
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Copyright © 2017 Red Hat Inc.
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Permission is hereby granted, free of charge, to any person obtaining a
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copy of this software and associated documentation files (the "Software"),
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to deal in the Software without restriction, including without limitation
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the rights to use, copy, modify, merge, publish, distribute, sublicense,
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and/or sell copies of the Software, and to permit persons to whom the
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Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice (including the next
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paragraph) shall be included in all copies or substantial portions of the
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Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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DEALINGS IN THE SOFTWARE.
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</copyright>
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<description summary="Protocol to describe output regions">
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This protocol aims at describing outputs in a way which is more in line
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with the concept of an output on desktop oriented systems.
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Some information are more specific to the concept of an output for
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a desktop oriented system and may not make sense in other applications,
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such as IVI systems for example.
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Typically, the global compositor space on a desktop system is made of
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a contiguous or overlapping set of rectangular regions.
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Some of the information provided in this protocol might be identical
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to their counterparts already available from wl_output, in which case
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the information provided by this protocol should be preferred to their
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equivalent in wl_output. The goal is to move the desktop specific
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concepts (such as output location within the global compositor space,
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the connector name and types, etc.) out of the core wl_output protocol.
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Warning! The protocol described in this file is experimental and
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backward incompatible changes may be made. Backward compatible
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changes may be added together with the corresponding interface
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version bump.
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Backward incompatible changes are done by bumping the version
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number in the protocol and interface names and resetting the
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interface version. Once the protocol is to be declared stable,
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the 'z' prefix and the version number in the protocol and
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interface names are removed and the interface version number is
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reset.
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</description>
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<interface name="zxdg_output_manager_v1" version="3">
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<description summary="manage xdg_output objects">
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A global factory interface for xdg_output objects.
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</description>
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<request name="destroy" type="destructor">
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<description summary="destroy the xdg_output_manager object">
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Using this request a client can tell the server that it is not
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going to use the xdg_output_manager object anymore.
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Any objects already created through this instance are not affected.
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</description>
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</request>
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<request name="get_xdg_output">
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<description summary="create an xdg output from a wl_output">
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This creates a new xdg_output object for the given wl_output.
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</description>
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<arg name="id" type="new_id" interface="zxdg_output_v1"/>
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<arg name="output" type="object" interface="wl_output"/>
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</request>
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</interface>
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<interface name="zxdg_output_v1" version="3">
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<description summary="compositor logical output region">
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An xdg_output describes part of the compositor geometry.
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This typically corresponds to a monitor that displays part of the
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compositor space.
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For objects version 3 onwards, after all xdg_output properties have been
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sent (when the object is created and when properties are updated), a
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wl_output.done event is sent. This allows changes to the output
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properties to be seen as atomic, even if they happen via multiple events.
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</description>
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<request name="destroy" type="destructor">
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<description summary="destroy the xdg_output object">
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Using this request a client can tell the server that it is not
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going to use the xdg_output object anymore.
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</description>
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</request>
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<event name="logical_position">
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<description summary="position of the output within the global compositor space">
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The position event describes the location of the wl_output within
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the global compositor space.
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The logical_position event is sent after creating an xdg_output
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(see xdg_output_manager.get_xdg_output) and whenever the location
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of the output changes within the global compositor space.
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</description>
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<arg name="x" type="int"
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summary="x position within the global compositor space"/>
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<arg name="y" type="int"
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summary="y position within the global compositor space"/>
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</event>
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<event name="logical_size">
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<description summary="size of the output in the global compositor space">
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The logical_size event describes the size of the output in the
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global compositor space.
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For example, a surface without any buffer scale, transformation
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nor rotation set, with the size matching the logical_size will
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have the same size as the corresponding output when displayed.
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Most regular Wayland clients should not pay attention to the
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logical size and would rather rely on xdg_shell interfaces.
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Some clients such as Xwayland, however, need this to configure
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their surfaces in the global compositor space as the compositor
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may apply a different scale from what is advertised by the output
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scaling property (to achieve fractional scaling, for example).
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For example, for a wl_output mode 3840×2160 and a scale factor 2:
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- A compositor not scaling the surface buffers will advertise a
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logical size of 3840×2160,
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- A compositor automatically scaling the surface buffers will
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advertise a logical size of 1920×1080,
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- A compositor using a fractional scale of 1.5 will advertise a
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logical size to 2560×1620.
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For example, for a wl_output mode 1920×1080 and a 90 degree rotation,
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the compositor will advertise a logical size of 1080x1920.
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The logical_size event is sent after creating an xdg_output
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(see xdg_output_manager.get_xdg_output) and whenever the logical
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size of the output changes, either as a result of a change in the
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applied scale or because of a change in the corresponding output
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mode(see wl_output.mode) or transform (see wl_output.transform).
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</description>
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<arg name="width" type="int"
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summary="width in global compositor space"/>
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<arg name="height" type="int"
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summary="height in global compositor space"/>
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</event>
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<event name="done">
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<description summary="all information about the output have been sent">
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This event is sent after all other properties of an xdg_output
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have been sent.
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This allows changes to the xdg_output properties to be seen as
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atomic, even if they happen via multiple events.
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For objects version 3 onwards, this event is deprecated. Compositors
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are not required to send it anymore and must send wl_output.done
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instead.
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</description>
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</event>
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<!-- Version 2 additions -->
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<event name="name" since="2">
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<description summary="name of this output">
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Many compositors will assign names to their outputs, show them to the
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user, allow them to be configured by name, etc. The client may wish to
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know this name as well to offer the user similar behaviors.
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The naming convention is compositor defined, but limited to
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alphanumeric characters and dashes (-). Each name is unique among all
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wl_output globals, but if a wl_output global is destroyed the same name
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may be reused later. The names will also remain consistent across
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sessions with the same hardware and software configuration.
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Examples of names include 'HDMI-A-1', 'WL-1', 'X11-1', etc. However, do
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not assume that the name is a reflection of an underlying DRM
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connector, X11 connection, etc.
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The name event is sent after creating an xdg_output (see
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xdg_output_manager.get_xdg_output). This event is only sent once per
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xdg_output, and the name does not change over the lifetime of the
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wl_output global.
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</description>
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<arg name="name" type="string" summary="output name"/>
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</event>
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<event name="description" since="2">
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<description summary="human-readable description of this output">
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Many compositors can produce human-readable descriptions of their
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outputs. The client may wish to know this description as well, to
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communicate the user for various purposes.
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The description is a UTF-8 string with no convention defined for its
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contents. Examples might include 'Foocorp 11" Display' or 'Virtual X11
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output via :1'.
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The description event is sent after creating an xdg_output (see
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xdg_output_manager.get_xdg_output) and whenever the description
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changes. The description is optional, and may not be sent at all.
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For objects of version 2 and lower, this event is only sent once per
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xdg_output, and the description does not change over the lifetime of
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the wl_output global.
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</description>
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<arg name="description" type="string" summary="output description"/>
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</event>
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</interface>
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</protocol>
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