Copyright © 2023 Valve Corporation 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. When a compositor latches on to new content updates it will check for any number of requirements of the available content updates (such as fences of all buffers being signalled) to consider the update ready. This protocol provides a method for adding a time constraint to surface content. This constraint indicates to the compositor that a content update should be presented as closely as possible to, but not before, a specified time. This protocol does not change the Wayland property that content updates are applied in the order they are received, even when some content updates contain timestamps and others do not. To provide timestamps, this global factory interface must be used to acquire a wp_commit_timing_v1 object for a surface, which may then be used to provide timestamp information for commits. Warning! The protocol described in this file is currently in the testing phase. Backward compatible changes may be added together with the corresponding interface version bump. Backward incompatible changes can only be done by creating a new major version of the extension. Informs the server that the client will no longer be using this protocol object. Existing objects created by this object are not affected. Establish a timing controller for a surface. Only one commit timer can be created for a surface, or a commit_timer_exists protocol error will be generated. An object to set a time constraint for a content update on a surface. Provide a timing constraint for a surface content update. A set_timestamp request may be made before a wl_surface.commit to tell the compositor that the content is intended to be presented as closely as possible to, but not before, the specified time. The time is in the domain of the compositor's presentation clock. An invalid_timestamp error will be generated for invalid tv_nsec. If a timestamp already exists on the surface, a timestamp_exists error is generated. Requesting set_timestamp after the commit_timer object's surface is destroyed will generate a "surface_destroyed" error. Informs the server that the client will no longer be using this protocol object. Existing timing constraints are not affected by the destruction.