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206 lines
9.7 KiB
206 lines
9.7 KiB
<protocol name="fullscreen_shell">
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<interface name="_wl_fullscreen_shell" version="1">
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<description summary="Displays a single surface per output">
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Displays a single surface per output.
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This interface provides a mechanism for a single client to display
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simple full-screen surfaces. While there technically may be multiple
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clients bound to this interface, only one of those clients should be
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shown at a time.
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To present a surface, the client uses either the present_surface or
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present_surface_for_mode requests. Presenting a surface takes effect
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on the next wl_surface.commit. See the individual requests for
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details about scaling and mode switches.
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The client can have at most one surface per output at any time.
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Requesting a surface be presented on an output that already has a
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surface replaces the previously presented surface. Presenting a null
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surface removes its content and effectively disables the output.
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Exactly what happens when an output is "disabled" is
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compositor-specific. The same surface may be presented on multiple
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outputs simultaneously.
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Once a surface is presented on an output, it stays on that output
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until either the client removes it or the compositor destroys the
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output. This way, the client can update the output's contents by
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simply attaching a new buffer.
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</description>
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<request name="release" type="destructor">
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<description summary="release the wl_fullscreen_shell interface">
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Release the binding from the wl_fullscreen_shell interface
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This destroys the server-side object and frees this binding. If
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the client binds to wl_fullscreen_shell multiple times, it may wish
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to free some of those bindings.
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</description>
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</request>
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<enum name="capability">
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<description summary="capabilities advertised by the compositor">
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Various capabilities that can be advertised by the compositor. They
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are advertised one-at-a-time when the wl_fullscreen_shell interface is
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bound. See the wl_fullscreen_shell.capability event for more details.
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ARBITRARY_MODE:
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This is a hint to the client that indicates that the compositor is
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capable of setting practially any mode on its outputs. If this
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capability is provided, wl_fullscreen_shell.present_surface_for_mode
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will almost never fail and clients should feel free to set whatever
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mode they like. If the compositor does not advertise this, it may
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still suppot some modes that are not advertised through wl_global.mode
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but it is less likely.
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CURSOR_PLANE:
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This is a hint to the client that indicates that the compositor can
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handle a cursor surface from the client without actually compositing.
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This may be because of a hardware cursor plane or some other mechanism.
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If the compositor does not advertise this capability then setting
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wl_pointer.cursor may degrade performance or be ignored entirely. If
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CURSOR_PLANE is not advertised, it is recommended that the client draw
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its own cursor and set wl_pointer.cursor(NULL).
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</description>
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<entry name="arbitrary_modes" value="1" summary="compositor is capable of almost any output mode"/>
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<entry name="cursor_plane" value="2" summary="compositor has a seperate cursor plane"/>
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</enum>
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<event name="capability">
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<description summary="advertises a capability of the compositor">
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Advertises a single capability of the compositor.
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When the wl_fullscreen_shell interface is bound, this event is emitted
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once for each capability advertised. Valid capabilities are given by
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the wl_fullscreen_shell.capability enum. If clients want to take
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advantage of any of these capabilities, they sould use a
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wl_display.sync request immediatly after binding to ensure that they
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recieve all the capability events.
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</description>
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<arg name="capabilty" type="uint"/>
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</event>
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<enum name="present_method">
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<description summary="different method to set the surface fullscreen">
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Hints to indicate to the compositor how to deal with a conflict
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between the dimensions of the surface and the dimensions of the
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output. The compositor is free to ignore this parameter.
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</description>
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<entry name="default" value="0" summary="no preference, apply default policy"/>
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<entry name="center" value="1" summary="center the surface on the output"/>
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<entry name="zoom" value="2" summary="scale the surface, preserving aspect ratio, to the largest size that will fit on the output" />
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<entry name="zoom_crop" value="3" summary="scale the surface, preserving aspect ratio, to fully fill the output cropping if needed" />
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<entry name="stretch" value="4" summary="scale the surface to the size of the output ignoring aspect ratio" />
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</enum>
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<request name="present_surface">
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<description summary="present surface for display">
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Present a surface on the given output.
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If the output is null, the compositor will present the surface on
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whatever display (or displays) it thinks best. In particular, this
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may replace any or all surfaces currently presented so it should
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not be used in combination with placing surfaces on specific
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outputs.
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The method parameter is a hint to the compositor for how the surface
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is to be presented. In particular, it tells the compostior how to
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handle a size mismatch between the presented surface and the
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output. The compositor is free to ignore this parameter.
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The "zoom", "zoom_crop", and "stretch" methods imply a scaling
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operation on the surface. This will override any kind of output
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scaling, so the buffer_scale property of the surface is effectively
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ignored.
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</description>
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<arg name="surface" type="object" interface="wl_surface" allow-null="true"/>
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<arg name="method" type="uint"/>
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<arg name="output" type="object" interface="wl_output" allow-null="true"/>
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</request>
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<request name="present_surface_for_mode">
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<description summary="present surface for display at a particular mode">
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Presents a surface on the given output for a particular mode.
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If the current size of the output differs from that of the surface,
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the compositor will attempt to change the size of the output to
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match the surface. The result of the mode-switch operation will be
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returned via the provided wl_fullscreen_shell_mode_feedback object.
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If the current output mode matches the one requested or if the
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compositor successfully switches the mode to match the surface,
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then the mode_successful event will be sent and the output will
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contain the contents of the given surface. If the compositor
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cannot match the output size to the surface size, the mode_failed
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will be sent and the output will contain the contents of the
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previously presented surface (if any). If another surface is
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presented on the given output before either of these has a chance
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to happen, the present_cancelled event will be sent.
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Due to race conditions and other issues unknown to the client, no
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mode-switch operation is guaranteed to succeed. However, if the
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mode is one advertised by wl_output.mode or if the compositor
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advertises the ARBITRARY_MODES capability, then the client should
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expect that the mode-switch operation will usually succeed.
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If the size of the presented surface changes, the resulting output
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is undefined. The compositor may attempt to change the output mode
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to compensate. However, there is no guarantee that a suitable mode
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will be found and the client has no way to be notified of success
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or failure.
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The framerate parameter specifies the desired framerate for the
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output in mHz. The compositor is free to ignore this parameter. A
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value of 0 indicates that the client has no preference.
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If the value of wl_output.scale differs from wl_surface.buffer_scale,
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then the compositor may choose a mode that matches either the buffer
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size or the surface size. In either case, the surface will fill the
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output.
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</description>
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<arg name="surface" type="object" interface="wl_surface"/>
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<arg name="output" type="object" interface="wl_output"/>
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<arg name="framerate" type="int"/>
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<arg name="feedback" type="new_id" interface="_wl_fullscreen_shell_mode_feedback"/>
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</request>
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<enum name="error">
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<description summary="wl_fullscreen_shell error values">
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These errors can be emitted in response to wl_fullscreen_shell requests
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</description>
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<entry name="invalid_method" value="0" summary="present_method is not known"/>
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</enum>
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</interface>
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<interface name="_wl_fullscreen_shell_mode_feedback" version="1">
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<event name="mode_successful">
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<description summary="mode switch succeeded">
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This event indicates that the attempted mode switch operation was
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successful. A surface of the size requested in the mode switch
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will fill the output without scaling.
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Upon receiving this event, the client should destroy the
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wl_fullscreen_shell_mode_feedback object.
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</description>
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</event>
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<event name="mode_failed">
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<description summary="mode switch failed">
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This event indicates that the attempted mode switch operation
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failed. This may be because the requested output mode is not
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possible or it may mean that the compositor does not want to allow it.
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Upon receiving this event, the client should destroy the
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wl_fullscreen_shell_mode_feedback object.
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</description>
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</event>
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<event name="present_cancelled">
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<description summary="mode switch cancelled">
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This event indicates that the attempted mode switch operation was
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cancelled. Most likely this is because the client requested a
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second mode switch before the first one completed.
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Upon receiving this event, the client should destroy the
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wl_fullscreen_shell_mode_feedback object.
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</description>
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</event>
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</interface>
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</protocol>
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