Copyright 2016 The Chromium Authors. 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. Allows a wl_touch to report stylus specific information. The client can interpret the on-screen stylus like any other touch event, and use this protocol to obtain detail information about the type of stylus, as well as the force and tilt of the tool. These events are to be fired by the server within the same frame as other wl_touch events. 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 uinterface version bump. Backward incompatible changes are done by bumping the version number in the protocol and uinterface 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. Create touch_stylus object. See zcr_touch_stylus_v1 interface for details. If the given wl_touch already has a touch_stylus object associated, the touch_stylus_exists protocol error is raised. The zcr_touch_stylus_v1 interface extends the wl_touch interface with events to describe details about a stylus. Notification that the user is using a tool type other than touch. There can only be one tool in use at a time. This event is sent in the same frame as the wl_touch.down event. The tool type cannot change while a touch is being reported. Notification of a change in physical force on the surface of the screen. The force is calibrated and normalized to the 0 to 1 range. Notification of a change in tilt of a stylus. Measured from surface normal as plane angle in degrees, values lie in [-90,90]. A positive x is to the right and a positive y is towards the user.