fullscreen_shell
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# _wl_fullscreen_shell
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 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.Requests
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void _wl_fullscreen_shell_release(struct _wl_fullscreen_shell* _wl_fullscreen_shell)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.
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void _wl_fullscreen_shell_present_surface(struct _wl_fullscreen_shell* _wl_fullscreen_shell,struct wl_surface* surface,uint32_t method,struct wl_output* output)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 compostior 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.
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struct _wl_fullscreen_shell_mode_feedback* _wl_fullscreen_shell_present_surface_for_mode(struct _wl_fullscreen_shell* _wl_fullscreen_shell,struct wl_surface* surface,struct wl_output* output,int32_t framerate)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.
Events
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uint32_t capabilityAdvertises 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.
Enums
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_WL_FULLSCREEN_SHELL_CAPABILITY_ARBITRARY_MODES /* compositor is capable of almost any output mode */_WL_FULLSCREEN_SHELL_CAPABILITY_CURSOR_PLANE /* compositor has a separate cursor plane */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_MODE: 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).
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_WL_FULLSCREEN_SHELL_PRESENT_METHOD_DEFAULT /* no preference, apply default policy */_WL_FULLSCREEN_SHELL_PRESENT_METHOD_CENTER /* center the surface on the output */_WL_FULLSCREEN_SHELL_PRESENT_METHOD_ZOOM /* scale the surface, preserving aspect ratio, to the largest size that will fit on the output */_WL_FULLSCREEN_SHELL_PRESENT_METHOD_ZOOM_CROP /* scale the surface, preserving aspect ratio, to fully fill the output cropping if needed */_WL_FULLSCREEN_SHELL_PRESENT_METHOD_STRETCH /* scale the surface to the size of the output ignoring aspect ratio */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.
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_WL_FULLSCREEN_SHELL_ERROR_INVALID_METHOD /* present_method is not known */These errors can be emitted in response to wl_fullscreen_shell requests
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# _wl_fullscreen_shell_mode_feedback
Events
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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.
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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.
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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.
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