Copyright © 2019 Collabora, Ltd. 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. Tell the server that this client is ready to be shown. The server will delay presentation during start-up until all shell clients are ready to be shown, and will display a black screen instead. This gives the client an opportunity to set up and configure several surfaces into a coherent interface. The client that binds to this interface must send this request, otherwise they may stall the compositor unnecessarily. If this request is called after the compositor has already finished start-up, no operation is performed. Set the surface to act as the background of an output. After this request, the server will immediately send a configure event with the dimensions the client should use to cover the entire output. The surface must have a "desktop" surface role, as supported by libweston-desktop. Only a single surface may be the background for any output. If a background surface already exists, a protocol error is raised. Set the surface to act as a panel of an output. The 'edge' argument says what edge of the output the surface will be anchored to. After this request, the server will send a configure event with the corresponding width/height that the client should use, and 0 for the other dimension. E.g. if the edge is 'top', the width will be the output's width, and the height will be 0. The surface must have a "desktop" surface role, as supported by libweston-desktop. The compositor will take the panel's window geometry into account when positioning other windows, so the panels are not covered. XXX: What happens if e.g. both top and left are used at the same time? Who gets to have the corner? Only a single surface may be the panel for an output's edge. If a surface already exists on an edge, a protocol error is raised. Ask the compositor to make a toplevel to become the current/focused window for window management purposes. See xdg_toplevel.set_app_id from the xdg-shell protocol for a description of app_id. If multiple toplevels have the same app_id, the result is unspecified. XXX: Do we need feedback to say it didn't work? (e.g. client does not exist)