Copyright © 2008-2011 Kristian Høgsberg Copyright © 2010-2011 Intel Corporation Permission to use, copy, modify, distribute, and sell this software and its documentation for any purpose is hereby granted without fee, provided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in supporting documentation, and that the name of the copyright holders not be used in advertising or publicity pertaining to distribution of the software without specific, written prior permission. The copyright holders make no representations about the suitability of this software for any purpose. It is provided "as is" without express or implied warranty. THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. The core global object. This is a special singleton object. It is used for internal Wayland protocol features. The sync request asks the server to emit the 'done' event on the returned wl_callback object. Since requests are handled in-order and events are delivered in-order, this can used as a barrier to ensure all previous requests and the resulting events have been handled. The object returned by this request will be destroyed by the compositor after the callback is fired and as such the client must not attempt to use it after that point. This request creates a registry object that allows the client to list and bind the global objects available from the compositor. The error event is sent out when a fatal (non-recoverable) error has occurred. The object_id argument is the object where the error occurred, most often in response to a request to that object. The code identifies the error and is defined by the object interface. As such, each interface defines its own set of error codes. The message is an brief description of the error, for (debugging) convenience. These errors are global and can be emitted in response to any server request. This event is used internally by the object ID management logic. When a client deletes an object, the server will send this event to acknowledge that it has seen the delete request. When the client receive this event, it will know that it can safely reuse the object ID. The global registry object. The server has a number of global objects that are available to all clients. These objects typically represent an actual object in the server (for example, an input device) or they are singleton objects that provide extension functionality. When a client creates a registry object, the registry object will emit a global event for each global currently in the registry. Globals come and go as a result of device or monitor hotplugs, reconfiguration or other events, and the registry will send out global and global_remove events to keep the client up to date with the changes. To mark the end of the initial burst of events, the client can use the wl_display.sync request immediately after calling wl_display.get_registry. A client can bind to a global object by using the bind request. This creates a client-side handle that lets the object emit events to the client and lets the client invoke requests on the object. Binds a new, client-created object to the server using the specified name as the identifier. Notify the client of global objects. The event notifies the client that a global object with the given name is now available, and it implements the given version of the given interface. Notify the client of removed global objects. This event notifies the client that the global identified by name is no longer available. If the client bound to the global using the bind request, the client should now destroy that object. The object remains valid and requests to the object will be ignored until the client destroys it, to avoid races between the global going away and a client sending a request to it. Clients can handle the 'done' event to get notified when the related request is done. Notify the client when the related request is done. A compositor. This object is a singleton global. The compositor is in charge of combining the contents of multiple surfaces into one displayable output. Ask the compositor to create a new surface. Ask the compositor to create a new region. The wl_shm_pool object encapsulates a piece of memory shared between the compositor and client. Through the wl_shm_pool object, the client can allocate shared memory wl_buffer objects. All objects created through the same pool share the same underlying mapped memory. Reusing the mapped memory avoids the setup/teardown overhead and is useful when interactively resizing a surface or for many small buffers. Create a wl_buffer object from the pool. The buffer is created offset bytes into the pool and has width and height as specified. The stride arguments specifies the number of bytes from beginning of one row to the beginning of the next. The format is the pixel format of the buffer and must be one of those advertised through the wl_shm.format event. A buffer will keep a reference to the pool it was created from so it is valid to destroy the pool immediately after creating a buffer from it. Destroy the shared memory pool. The mmapped memory will be released when all buffers that have been created from this pool are gone. This request will cause the server to remap the backing memory for the pool from the file descriptor passed when the pool was created, but using the new size. A global singleton object that provides support for shared memory. Clients can create wl_shm_pool objects using the create_pool request. At connection setup time, the wl_shm object emits one or more format events to inform clients about the valid pixel formats that can be used for buffers. These errors can be emitted in response to wl_shm requests. This describes the memory layout of an individual pixel. All renderers should support argb8888 and xrgb8888 but any other formats are optional and may not be supported by the particular renderer in use. Create a new wl_shm_pool object. The pool can be used to create shared memory based buffer objects. The server will mmap size bytes of the passed file descriptor, to use as backing memory for the pool. Informs the client about a valid pixel format that can be used for buffers. Known formats include argb8888 and xrgb8888. A buffer provides the content for a wl_surface. Buffers are created through factory interfaces such as wl_drm, wl_shm or similar. It has a width and a height and can be attached to a wl_surface, but the mechanism by which a client provides and updates the contents is defined by the buffer factory interface. Destroy a buffer. If and how you need to release the backing storage is defined by the buffer factory interface. For possible side-effects to a surface, see wl_surface.attach. Sent when this wl_buffer is no longer used by the compositor. The client is now free to re-use or destroy this buffer and its backing storage. If a client receives a release event before the frame callback requested in the same wl_surface.commit that attaches this wl_buffer to a surface, then the client is immediately free to re-use the buffer and its backing storage, and does not need a second buffer for the next surface content update. Typically this is possible, when the compositor maintains a copy of the wl_surface contents, e.g. as a GL texture. This is an important optimization for GL(ES) compositors with wl_shm clients. A wl_data_offer represents a piece of data offered for transfer by another client (the source client). It is used by the copy-and-paste and drag-and-drop mechanisms. The offer describes the different mime types that the data can be converted to and provides the mechanism for transferring the data directly from the source client. Indicate that the client can accept the given mime type, or NULL for not accepted. Used for feedback during drag-and-drop. To transfer the offered data, the client issues this request and indicates the mime type it wants to receive. The transfer happens through the passed file descriptor (typically created with the pipe system call). The source client writes the data in the mime type representation requested and then closes the file descriptor. The receiving client reads from the read end of the pipe until EOF and the closes its end, at which point the transfer is complete. Destroy the data offer. Sent immediately after creating the wl_data_offer object. One event per offered mime type. The wl_data_source object is the source side of a wl_data_offer. It is created by the source client in a data transfer and provides a way to describe the offered data and a way to respond to requests to transfer the data. This request adds a mime type to the set of mime types advertised to targets. Can be called several times to offer multiple types. Destroy the data source. Sent when a target accepts pointer_focus or motion events. If a target does not accept any of the offered types, type is NULL. Used for feedback during drag-and-drop. Request for data from the client. Send the data as the specified mime type over the passed file descriptor, then close it. This data source has been replaced by another data source. The client should clean up and destroy this data source. There is one wl_data_device per seat which can be obtained from the global wl_data_device_manager singleton. A wl_data_device provides access to inter-client data transfer mechanisms such as copy-and-paste and drag-and-drop. This request asks the compositor to start a drag-and-drop operation on behalf of the client. The source argument is the data source that provides the data for the eventual data transfer. If source is NULL, enter, leave and motion events are sent only to the client that initiated the drag and the client is expected to handle the data passing internally. The origin surface is the surface where the drag originates and the client must have an active implicit grab that matches the serial. The icon surface is an optional (can be NULL) surface that provides an icon to be moved around with the cursor. Initially, the top-left corner of the icon surface is placed at the cursor hotspot, but subsequent wl_surface.attach request can move the relative position. Attach requests must be confirmed with wl_surface.commit as usual. The current and pending input regions of the icon wl_surface are cleared, and wl_surface.set_input_region is ignored until the wl_surface is no longer used as the icon surface. When the use as an icon ends, the the current and pending input regions become undefined, and the wl_surface is unmapped. This request asks the compositor to set the selection to the data from the source on behalf of the client. To unset the selection, set the source to NULL. The data_offer event introduces a new wl_data_offer object, which will subsequently be used in either the data_device.enter event (for drag-and-drop) or the data_device.selection event (for selections). Immediately following the data_device_data_offer event, the new data_offer object will send out data_offer.offer events to describe the mime types it offers. This event is sent when an active drag-and-drop pointer enters a surface owned by the client. The position of the pointer at enter time is provided by the x and y arguments, in surface local coordinates. This event is sent when the drag-and-drop pointer leaves the surface and the session ends. The client must destroy the wl_data_offer introduced at enter time at this point. This event is sent when the drag-and-drop pointer moves within the currently focused surface. The new position of the pointer is provided by the x and y arguments, in surface local coordinates. The event is sent when a drag-and-drop operation is ended because the implicit grab is removed. The selection event is sent out to notify the client of a new wl_data_offer for the selection for this device. The data_device.data_offer and the data_offer.offer events are sent out immediately before this event to introduce the data offer object. The selection event is sent to a client immediately before receiving keyboard focus and when a new selection is set while the client has keyboard focus. The data_offer is valid until a new data_offer or NULL is received or until the client loses keyboard focus. The wl_data_device_manager is a singleton global object that provides access to inter-client data transfer mechanisms such as copy-and-paste and drag-and-drop. These mechanisms are tied to a wl_seat and this interface lets a client get a wl_data_device corresponding to a wl_seat. Create a new data source. Create a new data device for a given seat. This interface is implemented by servers that provide desktop-style user interfaces. It allows clients to associate a wl_shell_surface with a basic surface. Create a shell surface for an existing surface. Only one shell surface can be associated with a given surface. An interface that may be implemented by a wl_surface, for implementations that provide a desktop-style user interface. It provides requests to treat surfaces like toplevel, fullscreen or popup windows, move, resize or maximize them, associate metadata like title and class, etc. On the server side the object is automatically destroyed when the related wl_surface is destroyed. On client side, wl_shell_surface_destroy() must be called before destroying the wl_surface object. A client must respond to a ping event with a pong request or the client may be deemed unresponsive. Start a pointer-driven move of the surface. This request must be used in response to a button press event. The server may ignore move requests depending on the state of the surface (e.g. fullscreen or maximized). These values are used to indicate which edge of a surface is being dragged in a resize operation. The server may use this information to adapt its behavior, e.g. choose an appropriate cursor image. Start a pointer-driven resizing of the surface. This request must be used in response to a button press event. The server may ignore resize requests depending on the state of the surface (e.g. fullscreen or maximized). Map the surface as a toplevel surface. A toplevel surface is not fullscreen, maximized or transient. These flags specify details of the expected behaviour of transient surfaces. Used in the set_transient request. Map the surface relative to an existing surface. The x and y arguments specify the locations of the upper left corner of the surface relative to the upper left corner of the parent surface, in surface local coordinates. The flags argument controls details of the transient behaviour. Hints to indicate to the compositor how to deal with a conflict between the dimensions of the surface and the dimensions of the output. The compositor is free to ignore this parameter. Map the surface as a fullscreen surface. If an output parameter is given then the surface will be made fullscreen on that output. If the client does not specify the output then the compositor will apply its policy - usually choosing the output on which the surface has the biggest surface area. The client may specify a method to resolve a size conflict between the output size and the surface size - this is provided through the method parameter. The framerate parameter is used only when the method is set to "driver", to indicate the preferred framerate. A value of 0 indicates that the app does not care about framerate. The framerate is specified in mHz, that is framerate of 60000 is 60Hz. A method of "scale" or "driver" implies a scaling operation of the surface, either via a direct scaling operation or a change of the output mode. This will override any kind of output scaling, so that mapping a surface with a buffer size equal to the mode can fill the screen independent of buffer_scale. A method of "fill" means we don't scale up the buffer, however any output scale is applied. This means that you may run into an edge case where the application maps a buffer with the same size of the output mode but buffer_scale 1 (thus making a surface larger than the output). In this case it is allowed to downscale the results to fit the screen. The compositor must reply to this request with a configure event with the dimensions for the output on which the surface will be made fullscreen. Map the surface as a popup. A popup surface is a transient surface with an added pointer grab. An existing implicit grab will be changed to owner-events mode, and the popup grab will continue after the implicit grab ends (i.e. releasing the mouse button does not cause the popup to be unmapped). The popup grab continues until the window is destroyed or a mouse button is pressed in any other clients window. A click in any of the clients surfaces is reported as normal, however, clicks in other clients surfaces will be discarded and trigger the callback. The x and y arguments specify the locations of the upper left corner of the surface relative to the upper left corner of the parent surface, in surface local coordinates. Map the surface as a maximized surface. If an output parameter is given then the surface will be maximized on that output. If the client does not specify the output then the compositor will apply its policy - usually choosing the output on which the surface has the biggest surface area. The compositor will reply with a configure event telling the expected new surface size. The operation is completed on the next buffer attach to this surface. A maximized surface typically fills the entire output it is bound to, except for desktop element such as panels. This is the main difference between a maximized shell surface and a fullscreen shell surface. The details depend on the compositor implementation. Set a short title for the surface. This string may be used to identify the surface in a task bar, window list, or other user interface elements provided by the compositor. The string must be encoded in UTF-8. Set a class for the surface. The surface class identifies the general class of applications to which the surface belongs. A common convention is to use the file name (or the full path if it is a non-standard location) of the application's .desktop file as the class. Ping a client to check if it is receiving events and sending requests. A client is expected to reply with a pong request. The configure event asks the client to resize its surface. The size is a hint, in the sense that the client is free to ignore it if it doesn't resize, pick a smaller size (to satisfy aspect ratio or resize in steps of NxM pixels). The edges parameter provides a hint about how the surface was resized. The client may use this information to decide how to adjust its content to the new size (e.g. a scrolling area might adjust its content position to leave the viewable content unmoved). The client is free to dismiss all but the last configure event it received. The width and height arguments specify the size of the window in surface local coordinates. The popup_done event is sent out when a popup grab is broken, that is, when the user clicks a surface that doesn't belong to the client owning the popup surface. A surface is a rectangular area that is displayed on the screen. It has a location, size and pixel contents. The size of a surface (and relative positions on it) is described in surface local coordinates, which may differ from the buffer local coordinates of the pixel content, in case a buffer_transform or a buffer_scale is used. Surfaces are also used for some special purposes, e.g. as cursor images for pointers, drag icons, etc. Deletes the surface and invalidates its object ID. Set a buffer as the content of this surface. The new size of the surface is calculated based on the buffer size transformed by the inverse buffer_transform and the inverse buffer_scale. This means that the supplied buffer must be an integer multiple of the buffer_scale. The x and y arguments specify the location of the new pending buffer's upper left corner, relative to the current buffer's upper left corner, in surface local coordinates. In other words, the x and y, combined with the new surface size define in which directions the surface's size changes. Surface contents are double-buffered state, see wl_surface.commit. The initial surface contents are void; there is no content. wl_surface.attach assigns the given wl_buffer as the pending wl_buffer. wl_surface.commit makes the pending wl_buffer the new surface contents, and the size of the surface becomes the size calculated from the wl_buffer, as described above. After commit, there is no pending buffer until the next attach. Committing a pending wl_buffer allows the compositor to read the pixels in the wl_buffer. The compositor may access the pixels at any time after the wl_surface.commit request. When the compositor will not access the pixels anymore, it will send the wl_buffer.release event. Only after receiving wl_buffer.release, the client may re-use the wl_buffer. A wl_buffer that has been attached and then replaced by another attach instead of committed will not receive a release event, and is not used by the compositor. Destroying the wl_buffer after wl_buffer.release does not change the surface contents. However, if the client destroys the wl_buffer before receiving the wl_buffer.release event, the surface contents become undefined immediately. If wl_surface.attach is sent with a NULL wl_buffer, the following wl_surface.commit will remove the surface content. This request is used to describe the regions where the pending buffer is different from the current surface contents, and where the surface therefore needs to be repainted. The pending buffer must be set by wl_surface.attach before sending damage. The compositor ignores the parts of the damage that fall outside of the surface. Damage is double-buffered state, see wl_surface.commit. The damage rectangle is specified in surface local coordinates. The initial value for pending damage is empty: no damage. wl_surface.damage adds pending damage: the new pending damage is the union of old pending damage and the given rectangle. wl_surface.commit assigns pending damage as the current damage, and clears pending damage. The server will clear the current damage as it repaints the surface. Request notification when the next frame is displayed. Useful for throttling redrawing operations, and driving animations. The frame request will take effect on the next wl_surface.commit. The notification will only be posted for one frame unless requested again. A server should avoid signalling the frame callbacks if the surface is not visible in any way, e.g. the surface is off-screen, or completely obscured by other opaque surfaces. A client can request a frame callback even without an attach, damage, or any other state changes. wl_surface.commit triggers a display update, so the callback event will arrive after the next output refresh where the surface is visible. The object returned by this request will be destroyed by the compositor after the callback is fired and as such the client must not attempt to use it after that point. This request sets the region of the surface that contains opaque content. The opaque region is an optimization hint for the compositor that lets it optimize out redrawing of content behind opaque regions. Setting an opaque region is not required for correct behaviour, but marking transparent content as opaque will result in repaint artifacts. The opaque region is specified in surface local coordinates. The compositor ignores the parts of the opaque region that fall outside of the surface. Opaque region is double-buffered state, see wl_surface.commit. wl_surface.set_opaque_region changes the pending opaque region. wl_surface.commit copies the pending region to the current region. Otherwise, the pending and current regions are never changed. The initial value for opaque region is empty. Setting the pending opaque region has copy semantics, and the wl_region object can be destroyed immediately. A NULL wl_region causes the pending opaque region to be set to empty. This request sets the region of the surface that can receive pointer and touch events. Input events happening outside of this region will try the next surface in the server surface stack. The compositor ignores the parts of the input region that fall outside of the surface. The input region is specified in surface local coordinates. Input region is double-buffered state, see wl_surface.commit. wl_surface.set_input_region changes the pending input region. wl_surface.commit copies the pending region to the current region. Otherwise the pending and current regions are never changed, except cursor and icon surfaces are special cases, see wl_pointer.set_cursor and wl_data_device.start_drag. The initial value for input region is infinite. That means the whole surface will accept input. Setting the pending input region has copy semantics, and the wl_region object can be destroyed immediately. A NULL wl_region causes the input region to be set to infinite. Surface state (input, opaque, and damage regions, attached buffers, etc.) is double-buffered. Protocol requests modify the pending state, as opposed to current state in use by the compositor. Commit request atomically applies all pending state, replacing the current state. After commit, the new pending state is as documented for each related request. On commit, a pending wl_buffer is applied first, all other state second. This means that all coordinates in double-buffered state are relative to the new wl_buffer coming into use, except for wl_surface.attach itself. If there is no pending wl_buffer, the coordinates are relative to the current surface contents. All requests that need a commit to become effective are documented to affect double-buffered state. Other interfaces may add further double-buffered surface state. This is emitted whenever a surface's creation, movement, or resizing results in some part of it being within the scanout region of an output. Note that a surface may be overlapping with zero or more outputs. This is emitted whenever a surface's creation, movement, or resizing results in it no longer having any part of it within the scanout region of an output. This request sets an optional transformation on how the compositor interprets the contents of the buffer attached to the surface. The accepted values for the transform parameter are the values for wl_output.transform. Buffer transform is double-buffered state, see wl_surface.commit. A newly created surface has its buffer transformation set to normal. The purpose of this request is to allow clients to render content according to the output transform, thus permiting the compositor to use certain optimizations even if the display is rotated. Using hardware overlays and scanning out a client buffer for fullscreen surfaces are examples of such optimizations. Those optimizations are highly dependent on the compositor implementation, so the use of this request should be considered on a case-by-case basis. Note that if the transform value includes 90 or 270 degree rotation, the width of the buffer will become the surface height and the height of the buffer will become the surface width. This request sets an optional scaling factor on how the compositor interprets the contents of the buffer attached to the window. Buffer scale is double-buffered state, see wl_surface.commit. A newly created surface has its buffer scale set to 1. The purpose of this request is to allow clients to supply higher resolution buffer data for use on high resolution outputs. Its intended that you pick the same buffer scale as the scale of the output that the surface is displayed on.This means the compositor can avoid scaling when rendering the surface on that output. Note that if the scale is larger than 1, then you have to attach a buffer that is larger (by a factor of scale in each dimension) than the desired surface size. A seat is a group of keyboards, pointer and touch devices. This object is published as a global during start up, or when such a device is hot plugged. A seat typically has a pointer and maintains a keyboard focus and a pointer focus. This is a bitmask of capabilities this seat has; if a member is set, then it is present on the seat. This is emitted whenever a seat gains or loses the pointer, keyboard or touch capabilities. The argument is a capability enum containing the complete set of capabilities this seat has. The ID provided will be initialized to the wl_pointer interface for this seat. This request only takes effect if the seat has the pointer capability. The ID provided will be initialized to the wl_keyboard interface for this seat. This request only takes effect if the seat has the keyboard capability. The ID provided will be initialized to the wl_touch interface for this seat. This request only takes effect if the seat has the touch capability. In a multiseat configuration this can be used by the client to help identify which physical devices the seat represents. Based on the seat configuration used by the compositor. The wl_pointer interface represents one or more input devices, such as mice, which control the pointer location and pointer_focus of a seat. The wl_pointer interface generates motion, enter and leave events for the surfaces that the pointer is located over, and button and axis events for button presses, button releases and scrolling. Set the pointer surface, i.e., the surface that contains the pointer image (cursor). This request only takes effect if the pointer focus for this device is 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 pointer 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. Notification that this seat's pointer is focused on a certain surface. When an seat's focus enters a surface, the pointer image is undefined and a client should respond to this event by setting an appropriate pointer image with the set_cursor request. Notification that this seat's pointer is no longer focused on a certain surface. The leave notification is sent before the enter notification for the new focus. Notification of pointer location change. The arguments surface_x and surface_y are the location relative to the focused surface. Describes the physical state of a button which provoked the button event. Mouse button click and release notifications. The location of the click is given by the last motion or enter event. The time argument is a timestamp with millisecond granularity, with an undefined base. Describes the axis types of scroll events. Scroll and other axis notifications. For scroll events (vertical and horizontal scroll axes), the value parameter is the length of a vector along the specified axis in a coordinate space identical to those of motion events, representing a relative movement along the specified axis. For devices that support movements non-parallel to axes multiple axis events will be emitted. When applicable, for example for touch pads, the server can choose to emit scroll events where the motion vector is equivalent to a motion event vector. When applicable, clients can transform its view relative to the scroll distance. The wl_keyboard interface represents one or more keyboards associated with a seat. This specifies the format of the keymap provided to the client with the wl_keyboard.keymap event. This event provides a file descriptor to the client which can be memory-mapped to provide a keyboard mapping description. Notification that this seat's keyboard focus is on a certain surface. Notification that this seat's keyboard focus is no longer on a certain surface. The leave notification is sent before the enter notification for the new focus. Describes the physical state of a key which provoked the key event. A key was pressed or released. The time argument is a timestamp with millisecond granularity, with an undefined base. Notifies clients that the modifier and/or group state has changed, and it should update its local state. The wl_touch interface represents a touchscreen associated with a seat. Touch interactions can consist of one or more contacts. For each contact, a series of events is generated, starting with a down event, followed by zero or more motion events, and ending with an up event. Events relating to the same contact point can be identified by the ID of the sequence. A new touch point has appeared on the surface. This touch point is assigned a unique @id. Future events from this touchpoint reference this ID. The ID ceases to be valid after a touch up event and may be re-used in the future. The touch point has disappeared. No further events will be sent for this touchpoint and the touch point's ID is released and may be re-used in a future touch down event. A touchpoint has changed coordinates. Indicates the end of a contact point list. Sent if the compositor decides the touch stream is a global gesture. No further events are sent to the clients from that particular gesture. Touch cancellation applies to all touch points currently active on this client's surface. The client is responsible for finalizing the touch points, future touch points on this surface may re-use the touch point ID. An output describes part of the compositor geometry. The compositor works in the 'compositor coordinate system' and an output corresponds to rectangular area in that space that is actually visible. This typically corresponds to a monitor that displays part of the compositor space. This object is published as global during start up, or when a monitor is hotplugged. This enumeration describes how the physical pixels on an output are layed out. This describes the transform that a compositor will apply to a surface to compensate for the rotation or mirroring of an output device. The flipped values correspond to an initial flip around a vertical axis followed by rotation. The purpose is mainly to allow clients render accordingly and tell the compositor, so that for fullscreen surfaces, the compositor will still be able to scan out directly from client surfaces. The geometry event describes geometric properties of the output. The event is sent when binding to the output object and whenever any of the properties change. These flags describe properties of an output mode. They are used in the flags bitfield of the mode event. The mode event describes an available mode for the output. The event is sent when binding to the output object and there will always be one mode, the current mode. The event is sent again if an output changes mode, for the mode that is now current. In other words, the current mode is always the last mode that was received with the current flag set. The size of a mode is given in physical hardware units of the output device. This is not necessarily the same as the output size in the global compositor space. For instance, the output may be scaled, as described in wl_output.scale, or transformed , as described in wl_output.transform. This event is sent after all other properties has been sent after binding to the output object and after any other property changes done after that. This allows changes to the output properties to be seen as atomic, even if they happen via multiple events. This event contains scaling geometry information that is not in the geometry event. It may be sent after binding the output object or if the output scale changes later. If it is not sent, the client should assume a scale of 1. A scale larger than 1 means that the compositor will automatically scale surface buffers by this amount when rendering. This is used for very high resolution displays where applications rendering at the native resolution would be too small to be legible. It is intended that scaling aware clients track the current output of a surface, and if it is on a scaled output it should use wl_surface.set_buffer_scale with the scale of the output. That way the compositor can avoid scaling the surface, and the client can supply a higher detail image. A region object describes an area. Region objects are used to describe the opaque and input regions of a surface. Destroy the region. This will invalidate the object ID. Add the specified rectangle to the region. Subtract the specified rectangle from the region.