Fullscreen shell

Displays a single surface per output

Displays a single surface per output.

This interface provides a mechanism for a single client to display simple full-screen surfaces. While there technically may be multiple clients bound to this interface, only one of those clients should be shown at a time.

To present a surface, the client uses either the present_surface or present_surface_for_mode requests. Presenting a surface takes effect on the next wl_surface.commit. See the individual requests for details about scaling and mode switches.

The client can have at most one surface per output at any time. Requesting a surface to be presented on an output that already has a surface replaces the previously presented surface. Presenting a null surface removes its content and effectively disables the output. Exactly what happens when an output is "disabled" is compositor-specific. The same surface may be presented on multiple outputs simultaneously.

Once a surface is presented on an output, it stays on that output until either the client removes it or the compositor destroys the output. This way, the client can update the output's contents by simply attaching a new buffer.

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.

release()
Release the wl_fullscreen_shell interface

Release the binding from the wl_fullscreen_shell interface.

This destroys the server-side object and frees this binding. If the client binds to wl_fullscreen_shell multiple times, it may wish to free some of those bindings.

Argument
Type
Description
surfaceobject<wl_surface>allow null
methoduint<zwp_fullscreen_shell_v1.present_method>
outputobject<wl_output>allow null
Present surface for display

Present a surface on the given output.

If the output is null, the compositor will present the surface on whatever display (or displays) it thinks best. In particular, this may replace any or all surfaces currently presented so it should not be used in combination with placing surfaces on specific outputs.

The method parameter is a hint to the compositor for how the surface is to be presented. In particular, it tells the compositor how to handle a size mismatch between the presented surface and the output. The compositor is free to ignore this parameter.

The "zoom", "zoom_crop", and "stretch" methods imply a scaling operation on the surface. This will override any kind of output scaling, so the buffer_scale property of the surface is effectively ignored.

This request gives the surface the role of a fullscreen shell surface. If the surface already has another role, it raises a role protocol error.

present_surface_for_mode(surface: object<wl_surface>, output: object<wl_output>, framerate: int, feedback: new_id<zwp_fullscreen_shell_mode_feedback_v1>)
Present surface for display at a particular mode

Presents a surface on the given output for a particular mode.

If the current size of the output differs from that of the surface, the compositor will attempt to change the size of the output to match the surface. The result of the mode-switch operation will be returned via the provided wl_fullscreen_shell_mode_feedback object.

If the current output mode matches the one requested or if the compositor successfully switches the mode to match the surface, then the mode_successful event will be sent and the output will contain the contents of the given surface. If the compositor cannot match the output size to the surface size, the mode_failed will be sent and the output will contain the contents of the previously presented surface (if any). If another surface is presented on the given output before either of these has a chance to happen, the present_cancelled event will be sent.

Due to race conditions and other issues unknown to the client, no mode-switch operation is guaranteed to succeed. However, if the mode is one advertised by wl_output.mode or if the compositor advertises the ARBITRARY_MODES capability, then the client should expect that the mode-switch operation will usually succeed.

If the size of the presented surface changes, the resulting output is undefined. The compositor may attempt to change the output mode to compensate. However, there is no guarantee that a suitable mode will be found and the client has no way to be notified of success or failure.

The framerate parameter specifies the desired framerate for the output in mHz. The compositor is free to ignore this parameter. A value of 0 indicates that the client has no preference.

If the value of wl_output.scale differs from wl_surface.buffer_scale, then the compositor may choose a mode that matches either the buffer size or the surface size. In either case, the surface will fill the output.

This request gives the surface the role of a fullscreen shell surface. If the surface already has another role, it raises a role protocol error.

Advertises a capability of the compositor

Advertises a single capability of the compositor.

When the wl_fullscreen_shell interface is bound, this event is emitted once for each capability advertised. Valid capabilities are given by the wl_fullscreen_shell.capability enum. If clients want to take advantage of any of these capabilities, they should use a wl_display.sync request immediately after binding to ensure that they receive all the capability events.

capability { arbitrary_modes, cursor_plane } 
Argument
Value
Description
arbitrary_modes1
compositor is capable of almost any output mode
cursor_plane2
compositor has a separate cursor plane
Capabilities advertised by the compositor

Various capabilities that can be advertised by the compositor. They are advertised one-at-a-time when the wl_fullscreen_shell interface is bound. See the wl_fullscreen_shell.capability event for more details.

ARBITRARY_MODES: This is a hint to the client that indicates that the compositor is capable of setting practically any mode on its outputs. If this capability is provided, wl_fullscreen_shell.present_surface_for_mode will almost never fail and clients should feel free to set whatever mode they like. If the compositor does not advertise this, it may still support some modes that are not advertised through wl_global.mode but it is less likely.

CURSOR_PLANE: This is a hint to the client that indicates that the compositor can handle a cursor surface from the client without actually compositing. This may be because of a hardware cursor plane or some other mechanism. If the compositor does not advertise this capability then setting wl_pointer.cursor may degrade performance or be ignored entirely. If CURSOR_PLANE is not advertised, it is recommended that the client draw its own cursor and set wl_pointer.cursor(NULL).

present_method { default, center, zoom, zoom_crop, stretch } 
Argument
Value
Description
default0
no preference, apply default policy
center1
center the surface on the output
zoom2
scale the surface, preserving aspect ratio, to the largest size that will fit on the output
zoom_crop3
scale the surface, preserving aspect ratio, to fully fill the output cropping if needed
stretch4
scale the surface to the size of the output ignoring aspect ratio
Different method to set the surface fullscreen

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.

error { invalid_method, role } 
Argument
Value
Description
invalid_method0
present_method is not known
role1
given wl_surface has another role
Wl_fullscreen_shell error values

These errors can be emitted in response to wl_fullscreen_shell requests.



mode_successful()
Mode switch succeeded

This event indicates that the attempted mode switch operation was successful. A surface of the size requested in the mode switch will fill the output without scaling.

Upon receiving this event, the client should destroy the wl_fullscreen_shell_mode_feedback object.

mode_failed()
Mode switch failed

This event indicates that the attempted mode switch operation failed. This may be because the requested output mode is not possible or it may mean that the compositor does not want to allow it.

Upon receiving this event, the client should destroy the wl_fullscreen_shell_mode_feedback object.

present_cancelled()
Mode switch cancelled

This event indicates that the attempted mode switch operation was cancelled. Most likely this is because the client requested a second mode switch before the first one completed.

Upon receiving this event, the client should destroy the wl_fullscreen_shell_mode_feedback object.


Copyright © 2016 Yong Bakos Copyright © 2015 Jason Ekstrand Copyright © 2015 Jonas Ådahl

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