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<?xml version="1.0" encoding="UTF-8"?>
<protocol name="tablet_unstable_v1">
<copyright>
Copyright 2014 © Stephen "Lyude" Chandler Paul
Copyright 2015-2016 © Red Hat, Inc.
Permission is hereby granted, free of charge, to any person
obtaining a copy of this software and associated documentation files
(the "Software"), to deal in the Software without restriction,
including without limitation the rights to use, copy, modify, merge,
publish, distribute, sublicense, and/or sell copies of the Software,
and to permit persons to whom the Software is furnished to do so,
subject to the following conditions:
The above copyright notice and this permission notice (including the
next paragraph) shall be included in all copies or substantial
portions of the Software.
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 OR COPYRIGHT HOLDERS
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.
</copyright>
<description summary="Wayland protocol for graphics tablets">
This description provides a high-level overview of the interplay between
the interfaces defined this protocol. For details, see the protocol
specification.
More than one tablet may exist, and device-specifics matter. Tablets are
not represented by a single virtual device like wl_pointer. A client
binds to the tablet manager object which is just a proxy object. From
that, the client requests wp_tablet_manager.get_tablet_seat(wl_seat)
and that returns the actual interface that has all the tablets. With
this indirection, we can avoid merging wp_tablet into the actual Wayland
protocol, a long-term benefit.
The wp_tablet_seat sends a "tablet added" event for each tablet
connected. That event is followed by descriptive events about the
hardware; currently that includes events for name, vid/pid and
a wp_tablet.path event that describes a local path. This path can be
used to uniquely identify a tablet or get more information through
libwacom. Emulated or nested tablets can skip any of those, e.g. a
virtual tablet may not have a vid/pid. The sequence of descriptive
events is terminated by a wp_tablet.done event to signal that a client
may now finalize any initialization for that tablet.
Events from tablets require a tool in proximity. Tools are also managed
by the tablet seat; a "tool added" event is sent whenever a tool is new
to the compositor. That event is followed by a number of descriptive
events about the hardware; currently that includes capabilities,
hardware id and serial number, and tool type. Similar to the tablet
interface, a wp_tablet_tool.done event is sent to terminate that initial
sequence.
Any event from a tool happens on the wp_tablet_tool interface. When the
tool gets into proximity of the tablet, a proximity_in event is sent on
the wp_tablet_tool interface, listing the tablet and the surface. That
event is followed by a motion event with the coordinates. After that,
it's the usual motion, axis, button, etc. events. The protocol's
serialisation means events are grouped by wp_tablet_tool.frame events.
Two special events (that don't exist in X) are down and up. They signal
"tip touching the surface". For tablets without real proximity
detection, the sequence is: proximity_in, motion, down, frame.
When the tool leaves proximity, a proximity_out event is sent. If any
button is still down, a button release event is sent before this
proximity event. These button events are sent in the same frame as the
proximity event to signal to the client that the buttons were held when
the tool left proximity.
If the tool moves out of the surface but stays in proximity (i.e.
between windows), compositor-specific grab policies apply. This usually
means that the proximity-out is delayed until all buttons are released.
Moving a tool physically from one tablet to the other has no real effect
on the protocol, since we already have the tool object from the "tool
added" event. All the information is already there and the proximity
events on both tablets are all a client needs to reconstruct what
happened.
Some extra axes are normalized, i.e. the client knows the range as
specified in the protocol (e.g. [0, 65535]), the granularity however is
unknown. The current normalized axes are pressure, distance, and slider.
Other extra axes are in physical units as specified in the protocol.
The current extra axes with physical units are tilt, rotation and
wheel rotation.
Since tablets work independently of the pointer controlled by the mouse,
the focus handling is independent too and controlled by proximity.
The wp_tablet_tool.set_cursor request sets a tool-specific cursor.
This cursor surface may be the same as the mouse cursor, and it may be
the same across tools but it is possible to be more fine-grained. For
example, a client may set different cursors for the pen and eraser.
Tools are generally independent of tablets and it is
compositor-specific policy when a tool can be removed. Common approaches
will likely include some form of removing a tool when all tablets the
tool was used on are removed.
Warning! The protocol described in this file is experimental and
backward incompatible changes may be made. Backward compatible changes
may be added together with the corresponding interface version bump.
Backward incompatible changes are done by bumping the version number in
the protocol and interface names and resetting the interface version.
Once the protocol is to be declared stable, the 'z' prefix and the
version number in the protocol and interface names are removed and the
interface version number is reset.
</description>
<interface name="zwp_tablet_manager_v1" version="1">
<description summary="controller object for graphic tablet devices">
An object that provides access to the graphics tablets available on this
system. All tablets are associated with a seat, to get access to the
actual tablets, use wp_tablet_manager.get_tablet_seat.
</description>
<request name="get_tablet_seat">
<description summary="get the tablet seat">
Get the wp_tablet_seat object for the given seat. This object
provides access to all graphics tablets in this seat.
</description>
<arg name="tablet_seat" type="new_id" interface="zwp_tablet_seat_v1"/>
<arg name="seat" type="object" interface="wl_seat" summary="The wl_seat object to retrieve the tablets for" />
</request>
<request name="destroy" type="destructor">
<description summary="release the memory for the tablet manager object">
Destroy the wp_tablet_manager object. Objects created from this
object are unaffected and should be destroyed separately.
</description>
</request>
</interface>
<interface name="zwp_tablet_seat_v1" version="1">
<description summary="controller object for graphic tablet devices of a seat">
An object that provides access to the graphics tablets available on this
seat. After binding to this interface, the compositor sends a set of
wp_tablet_seat.tablet_added and wp_tablet_seat.tool_added events.
</description>
<request name="destroy" type="destructor">
<description summary="release the memory for the tablet seat object">
Destroy the wp_tablet_seat object. Objects created from this
object are unaffected and should be destroyed separately.
</description>
</request>
<event name="tablet_added">
<description summary="new device notification">
This event is sent whenever a new tablet becomes available on this
seat. This event only provides the object id of the tablet, any
static information about the tablet (device name, vid/pid, etc.) is
sent through the wp_tablet interface.
</description>
<arg name="id" type="new_id" interface="zwp_tablet_v1" summary="the newly added graphics tablet"/>
</event>
<event name="tool_added">
<description summary="a new tool has been used with a tablet">
This event is sent whenever a tool that has not previously been used
with a tablet comes into use. This event only provides the object id
of the tool; any static information about the tool (capabilities,
type, etc.) is sent through the wp_tablet_tool interface.
</description>
<arg name="id" type="new_id" interface="zwp_tablet_tool_v1" summary="the newly added tablet tool"/>
</event>
</interface>
<interface name="zwp_tablet_tool_v1" version="1">
<description summary="a physical tablet tool">
An object that represents a physical tool that has been, or is
currently in use with a tablet in this seat. Each wp_tablet_tool
object stays valid until the client destroys it; the compositor
reuses the wp_tablet_tool object to indicate that the object's
respective physical tool has come into proximity of a tablet again.
A wp_tablet_tool object's relation to a physical tool depends on the
tablet's ability to report serial numbers. If the tablet supports
this capability, then the object represents a specific physical tool
and can be identified even when used on multiple tablets.
A tablet tool has a number of static characteristics, e.g. tool type,
hardware_serial and capabilities. These capabilities are sent in an
event sequence after the wp_tablet_seat.tool_added event before any
actual events from this tool. This initial event sequence is
terminated by a wp_tablet_tool.done event.
Tablet tool events are grouped by wp_tablet_tool.frame events.
Any events received before a wp_tablet_tool.frame event should be
considered part of the same hardware state change.
</description>
<request name="set_cursor">
<description summary="set the tablet tool's surface">
Sets the surface of the cursor used for this tool on the given
tablet. This request only takes effect if the tool is in proximity
of one of the requesting client's surfaces or the surface parameter
is the current pointer surface. If there was a previous surface set
with this request it is replaced. If surface is NULL, the cursor
image is hidden.
The parameters hotspot_x and hotspot_y define the position of the
pointer surface relative to the pointer location. Its top-left corner
is always at (x, y) - (hotspot_x, hotspot_y), where (x, y) are the
coordinates of the pointer location, in surface-local coordinates.
On surface.attach requests to the pointer surface, hotspot_x and
hotspot_y are decremented by the x and y parameters passed to the
request. Attach must be confirmed by wl_surface.commit as usual.
The hotspot can also be updated by passing the currently set pointer
surface to this request with new values for hotspot_x and hotspot_y.
The current and pending input regions of the wl_surface are cleared,
and wl_surface.set_input_region is ignored until the wl_surface is no
longer used as the cursor. When the use as a cursor ends, the current
and pending input regions become undefined, and the wl_surface is
unmapped.
This request gives the surface the role of a cursor. The role
assigned by this request is the same as assigned by
wl_pointer.set_cursor meaning the same surface can be
used both as a wl_pointer cursor and a wp_tablet cursor. If the
surface already has another role, it raises a protocol error.
The surface may be used on multiple tablets and across multiple
seats.
</description>
<arg name="serial" type="uint" summary="serial of the enter event"/>
<arg name="surface" type="object" interface="wl_surface" allow-null="true"/>
<arg name="hotspot_x" type="int" summary="surface-local x coordinate"/>
<arg name="hotspot_y" type="int" summary="surface-local y coordinate"/>
</request>
<request name="destroy" type="destructor">
<description summary="destroy the tool object">
This destroys the client's resource for this tool object.
</description>
</request>
<enum name="type">
<description summary="a physical tool type">
Describes the physical type of a tool. The physical type of a tool
generally defines its base usage.
The mouse tool represents a mouse-shaped tool that is not a relative
device but bound to the tablet's surface, providing absolute
coordinates.
The lens tool is a mouse-shaped tool with an attached lens to
provide precision focus.
</description>
<entry name="pen" value="0x140" summary="Pen"/>
<entry name="eraser" value="0x141" summary="Eraser"/>
<entry name="brush" value="0x142" summary="Brush"/>
<entry name="pencil" value="0x143" summary="Pencil"/>
<entry name="airbrush" value="0x144" summary="Airbrush"/>
<entry name="finger" value="0x145" summary="Finger"/>
<entry name="mouse" value="0x146" summary="Mouse"/>
<entry name="lens" value="0x147" summary="Lens"/>
</enum>
<event name="type">
<description summary="tool type">
The tool type is the high-level type of the tool and usually decides
the interaction expected from this tool.
This event is sent in the initial burst of events before the
wp_tablet_tool.done event.
</description>
<arg name="tool_type" type="uint" enum="type" summary="the physical tool type"/>
</event>
<event name="hardware_serial">
<description summary="unique hardware serial number of the tool">
If the physical tool can be identified by a unique 64-bit serial
number, this event notifies the client of this serial number.
If multiple tablets are available in the same seat and the tool is
uniquely identifiable by the serial number, that tool may move
between tablets.
Otherwise, if the tool has no serial number and this event is
missing, the tool is tied to the tablet it first comes into
proximity with. Even if the physical tool is used on multiple
tablets, separate wp_tablet_tool objects will be created, one per
tablet.
This event is sent in the initial burst of events before the
wp_tablet_tool.done event.
</description>
<arg name="hardware_serial_hi" type="uint" summary="the unique serial number of the tool, most significant bits"/>
<arg name="hardware_serial_lo" type="uint" summary="the unique serial number of the tool, least significant bits"/>
</event>
<event name="hardware_id_wacom">
<description summary="hardware id notification in Wacom's format">
This event notifies the client of a hardware id available on this tool.
The hardware id is a device-specific 64-bit id that provides extra
information about the tool in use, beyond the wl_tool.type
enumeration. The format of the id is specific to tablets made by
Wacom Inc. For example, the hardware id of a Wacom Grip
Pen (a stylus) is 0x802.
This event is sent in the initial burst of events before the
wp_tablet_tool.done event.
</description>
<arg name="hardware_id_hi" type="uint" summary="the hardware id, most significant bits"/>
<arg name="hardware_id_lo" type="uint" summary="the hardware id, least significant bits"/>
</event>
<enum name="capability">
<description summary="capability flags for a tool">
Describes extra capabilities on a tablet.
Any tool must provide x and y values, extra axes are
device-specific.
</description>
<entry name="tilt" value="1" summary="Tilt axes"/>
<entry name="pressure" value="2" summary="Pressure axis"/>
<entry name="distance" value="3" summary="Distance axis"/>
<entry name="rotation" value="4" summary="Z-rotation axis"/>
<entry name="slider" value="5" summary="Slider axis"/>
<entry name="wheel" value="6" summary="Wheel axis"/>
</enum>
<event name="capability">
<description summary="tool capability notification">
This event notifies the client of any capabilities of this tool,
beyond the main set of x/y axes and tip up/down detection.
One event is sent for each extra capability available on this tool.
This event is sent in the initial burst of events before the
wp_tablet_tool.done event.
</description>
<arg name="capability" type="uint" enum="capability" summary="the capability"/>
</event>
<event name="done">
<description summary="tool description events sequence complete">
This event signals the end of the initial burst of descriptive
events. A client may consider the static description of the tool to
be complete and finalize initialization of the tool.
</description>
</event>
<event name="removed">
<description summary="tool removed">
This event is sent when the tool is removed from the system and will
send no further events. Should the physical tool come back into
proximity later, a new wp_tablet_tool object will be created.
It is compositor-dependent when a tool is removed. A compositor may
remove a tool on proximity out, tablet removal or any other reason.
A compositor may also keep a tool alive until shutdown.
If the tool is currently in proximity, a proximity_out event will be
sent before the removed event. See wp_tablet_tool.proximity_out for
the handling of any buttons logically down.
When this event is received, the client must wp_tablet_tool.destroy
the object.
</description>
</event>
<event name="proximity_in">
<description summary="proximity in event">
Notification that this tool is focused on a certain surface.
This event can be received when the tool has moved from one surface to
another, or when the tool has come back into proximity above the
surface.
If any button is logically down when the tool comes into proximity,
the respective button event is sent after the proximity_in event but
within the same frame as the proximity_in event.
</description>
<arg name="serial" type="uint"/>
<arg name="tablet" type="object" interface="zwp_tablet_v1" summary="The tablet the tool is in proximity of"/>
<arg name="surface" type="object" interface="wl_surface" summary="The current surface the tablet tool is over"/>
</event>
<event name="proximity_out">
<description summary="proximity out event">
Notification that this tool has either left proximity, or is no
longer focused on a certain surface.
When the tablet tool leaves proximity of the tablet, button release
events are sent for each button that was held down at the time of
leaving proximity. These events are sent before the proximity_out
event but within the same wp_tablet.frame.
If the tool stays within proximity of the tablet, but the focus
changes from one surface to another, a button release event may not
be sent until the button is actually released or the tool leaves the
proximity of the tablet.
</description>
</event>
<event name="down">
<description summary="tablet tool is making contact">
Sent whenever the tablet tool comes in contact with the surface of the
tablet.
If the tool is already in contact with the tablet when entering the
input region, the client owning said region will receive a
wp_tablet.proximity_in event, followed by a wp_tablet.down
event and a wp_tablet.frame event.
Note that this event describes logical contact, not physical
contact. On some devices, a compositor may not consider a tool in
logical contact until a minimum physical pressure threshold is
exceeded.
</description>
<arg name="serial" type="uint"/>
</event>
<event name="up">
<description summary="tablet tool is no longer making contact">
Sent whenever the tablet tool stops making contact with the surface of
the tablet, or when the tablet tool moves out of the input region
and the compositor grab (if any) is dismissed.
If the tablet tool moves out of the input region while in contact
with the surface of the tablet and the compositor does not have an
ongoing grab on the surface, the client owning said region will
receive a wp_tablet.up event, followed by a wp_tablet.proximity_out
event and a wp_tablet.frame event. If the compositor has an ongoing
grab on this device, this event sequence is sent whenever the grab
is dismissed in the future.
Note that this event describes logical contact, not physical
contact. On some devices, a compositor may not consider a tool out
of logical contact until physical pressure falls below a specific
threshold.
</description>
</event>
<event name="motion">
<description summary="motion event">
Sent whenever a tablet tool moves.
</description>
<arg name="x" type="fixed" summary="surface-local x coordinate"/>
<arg name="y" type="fixed" summary="surface-local y coordinate"/>
</event>
<event name="pressure">
<description summary="pressure change event">
Sent whenever the pressure axis on a tool changes. The value of this
event is normalized to a value between 0 and 65535.
Note that pressure may be nonzero even when a tool is not in logical
contact. See the down and up events for more details.
</description>
<arg name="pressure" type="uint" summary="The current pressure value"/>
</event>
<event name="distance">
<description summary="distance change event">
Sent whenever the distance axis on a tool changes. The value of this
event is normalized to a value between 0 and 65535.
Note that distance may be nonzero even when a tool is not in logical
contact. See the down and up events for more details.
</description>
<arg name="distance" type="uint" summary="The current distance value"/>
</event>
<event name="tilt">
<description summary="tilt change event">
Sent whenever one or both of the tilt axes on a tool change. Each tilt
value is in 0.01 of a degree, relative to the z-axis of the tablet.
The angle is positive when the top of a tool tilts along the
positive x or y axis.
</description>
<arg name="tilt_x" type="int" summary="The current value of the X tilt axis"/>
<arg name="tilt_y" type="int" summary="The current value of the Y tilt axis"/>
</event>
<event name="rotation">
<description summary="z-rotation change event">
Sent whenever the z-rotation axis on the tool changes. The
rotation value is in 0.01 of a degree clockwise from the tool's
logical neutral position.
</description>
<arg name="degrees" type="int" summary="The current rotation of the Z axis"/>
</event>
<event name="slider">
<description summary="Slider position change event">
Sent whenever the slider position on the tool changes. The
value is normalized between -65535 and 65535, with 0 as the logical
neutral position of the slider.
The slider is available on e.g. the Wacom Airbrush tool.
</description>
<arg name="position" type="int" summary="The current position of slider"/>
</event>
<event name="wheel">
<description summary="Wheel delta event">
Sent whenever the wheel on the tool emits an event. This event
contains two values for the same axis change. The degrees value is
in 0.01 of a degree in the same orientation as the
wl_pointer.vertical_scroll axis. The clicks value is in discrete
logical clicks of the mouse wheel. This value may be zero if the
movement of the wheel was less than one logical click.
Clients should choose either value and avoid mixing degrees and
clicks. The compositor may accumulate values smaller than a logical
click and emulate click events when a certain threshold is met.
Thus, wl_tablet_tool.wheel events with non-zero clicks values may
have different degrees values.
</description>
<arg name="degrees" type="int" summary="The wheel delta in 0.01 of a degree"/>
<arg name="clicks" type="int" summary="The wheel delta in discrete clicks"/>
</event>
<enum name="button_state">
<description summary="physical button state">
Describes the physical state of a button that produced the button event.
</description>
<entry name="released" value="0" summary="button is not pressed"/>
<entry name="pressed" value="1" summary="button is pressed"/>
</enum>
<event name="button">
<description summary="button event">
Sent whenever a button on the tool is pressed or released.
If a button is held down when the tool moves in or out of proximity,
button events are generated by the compositor. See
wp_tablet_tool.proximity_in and wp_tablet_tool.proximity_out for
details.
</description>
<arg name="serial" type="uint"/>
<arg name="button" type="uint" summary="The button whose state has changed"/>
<arg name="state" type="uint" enum="button_state" summary="Whether the button was pressed or released"/>
</event>
<event name="frame">
<description summary="frame event">
Marks the end of a series of axis and/or button updates from the
tablet. The Wayland protocol requires axis updates to be sent
sequentially, however all events within a frame should be considered
one hardware event.
</description>
<arg name="time" type="uint" summary="The time of the event with millisecond granularity"/>
</event>
<enum name="error">
<entry name="role" value="0" summary="given wl_surface has another role"/>
</enum>
</interface>
<interface name="zwp_tablet_v1" version="1">
<description summary="graphics tablet device">
The wp_tablet interface represents one graphics tablet device. The
tablet interface itself does not generate events; all events are
generated by wp_tablet_tool objects when in proximity above a tablet.
A tablet has a number of static characteristics, e.g. device name and
pid/vid. These capabilities are sent in an event sequence after the
wp_tablet_seat.tablet_added event. This initial event sequence is
terminated by a wp_tablet.done event.
</description>
<request name="destroy" type="destructor">
<description summary="destroy the tablet object">
This destroys the client's resource for this tablet object.
</description>
</request>
<event name="name">
<description summary="tablet device name">
This event is sent in the initial burst of events before the
wp_tablet.done event.
</description>
<arg name="name" type="string" summary="the device name"/>
</event>
<event name="id">
<description summary="tablet device USB vendor/product id">
This event is sent in the initial burst of events before the
wp_tablet.done event.
</description>
<arg name="vid" type="uint" summary="USB vendor id"/>
<arg name="pid" type="uint" summary="USB product id"/>
</event>
<event name="path">
<description summary="path to the device">
A system-specific device path that indicates which device is behind
this wp_tablet. This information may be used to gather additional
information about the device, e.g. through libwacom.
A device may have more than one device path. If so, multiple
wp_tablet.path events are sent. A device may be emulated and not
have a device path, and in that case this event will not be sent.
The format of the path is unspecified, it may be a device node, a
sysfs path, or some other identifier. It is up to the client to
identify the string provided.
This event is sent in the initial burst of events before the
wp_tablet.done event.
</description>
<arg name="path" type="string" summary="path to local device"/>
</event>
<event name="done">
<description summary="tablet description events sequence complete">
This event is sent immediately to signal the end of the initial
burst of descriptive events. A client may consider the static
description of the tablet to be complete and finalize initialization
of the tablet.
</description>
</event>
<event name="removed">
<description summary="tablet removed event">
Sent when the tablet has been removed from the system. When a tablet
is removed, some tools may be removed.
When this event is received, the client must wp_tablet.destroy
the object.
</description>
</event>
</interface>
</protocol>