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Update wlr-export-dmabuf
This contains several changes. The XML format and naming conventions have been tweaked to meet established Wayland conventions. I also updated the docs (they were outdated in several places) and clarified more of the edge cases. The surface_info event has been split into new_surface and new_output. The former is now able to describe a hiearchy of surfaces and can be used for subsurfaces, popups, etc. It is also used for hardware cursors. The capturing client is now responsible for compositing these surfaces if it desires, or omitting subsurfaces, popups, cursors, etc if it prefers to. The new_output event is now tied to wl_output, and the capture requests are combined into one. The frame interface has been tweaked to support using a single frame resource to receive several frames over the lifetime of your capture. It seems like we were already moving in this direction, but some details were lacking. The frame interface has also been tweaked to more closely resemble dmabuf import, but backwards. Despite how some people may feel about the dmabuf import protocol, I think it's better to be consistent across Wayland than to push that agenda. Regardless, most of the crappier details of that protocol were left behind. The most important changes in this respect were to change how planes were sent and described and to unify the naming and language of the protocols. Something I have left out is what to do about wl_subsurface. The new_surface::parent argument should be limited to wl_surfaces like xdg_popups. wl_subsurfaces behave differently enough that I want to deal with them in a separate patch. I also still have to write up the protocol error enums, but I'm lazy and will do it after hearing some feedback on these changes.
This commit is contained in:
Drew DeVault
parent
99a7742957
commit
7bc36596ea
1 changed files with 210 additions and 175 deletions
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@ -24,229 +24,264 @@
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DEALINGS IN THE SOFTWARE.
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DEALINGS IN THE SOFTWARE.
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</copyright>
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</copyright>
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<description summary="a protocol for low overhead screen content capturing">
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<interface name="zwlr_export_dmabuf_manager_v1" version="1">
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An interface to capture surfaces in an efficient way.
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<description summary="manages available buffers for capture">
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Overall usage:
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Clients who bind to this interface will receive events advertising a list
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of dmabuf sources available for export. This list may change over time, as
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new outputs and surfaces become available or are removed on the
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compositor.
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1.) client registers with zwlr_screencontent_manager_v1
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There is no guarantee that the compositor will send to the client all
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2.) server sends client info about surfaces via "receive_surface_info"
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surfaces and outputs that it knows of. The compositor may ask the user
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3.) client subscribes to capture a surface via the "capture" requests
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which sources they wish to make available to the client, and the list of
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4.) server sends client events via the "zwlr_screencontent_frame" interface
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authorized sources may change at any time.
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5.) client finishes and informs server via the "frame_destroy" event
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</description>
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6.) client optionally resubscribes via repeating steps 3.) through 5.)
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</description>
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<event name="new_surface">
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<description summary="a new surface is available for capture">
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This event is sent when a new wl_surface is available for dmabuf export.
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The source_id can be passed to the capture request to initiate a capture and
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is guaranteed to be unique among all source_ids emitted on this
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zwlr_export_dmabuf_manager_v1, including those from events other than
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new_surface.
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If the new surface is a toplevel, the name is non-null and will be set to a
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user-friendly window title (for example, via xdg_toplevel::set_title) and
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the parent argument will not be meaningful.
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If the surface is the child of a toplevel (such as an xdg_popup), the name
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will be null and the parent argument set to the ID of a previous
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new_surface event. The parent ID may also be set to the source ID of an
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output, for example, if the output is using a hardware cursor.
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If a child surface is reparented, the source_removed event is sent and
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new_surface raised with the new relationship indicated.
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</description>
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<arg name="source_id" type="uint"
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summary="a unique dmabuf source identifier"/>
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<arg name="name" type="string" allow-null="true"
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summary="user friendly surface name"/>
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<arg name="parent" type="uint"
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summary="source_id of the parent surface"/>
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</event>
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<event name="new_output">
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<description summary="a new output is available for capture">
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This event is sent when a new wl_output is available for dmabuf export.
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The source_id can be passed to the capture request to initiate a capture and
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is guaranteed to be unique among all source_ids emitted on this
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zwlr_export_dmabuf_manager_v1, including those from events other than
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new_output.
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If the client binds to the same wl_output more than once, and that output is
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available for capture, this event is sent once for each resource.
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</description>
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<arg name="source_id" type="uint"
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summary="a unique dmabuf source identifier"/>
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<arg name="output" type="object" interface="wl_output"
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summary="the wl_output being offered"/>
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</event>
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<event name="source_removed">
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<description summary="indicates a source is no longer available">
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This event is sent when a source previously announced becomes unavailable.
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The client may still create a frame resource for this source, but it will
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not receive any frames from it (instead, the cancel event will be immediately
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sent).
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</description>
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<arg name="source_id" type="uint"
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summary="the source_id of the source which has been removed"/>
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</event>
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<request name="capture">
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<description summary="create a frame resource for a source">
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Creates a frame resource for the given source.
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See the documentation of zwlr_export_dmabuf_frame_v1 for more details about
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the interface and its usage.
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</description>
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<arg name="frame" type="new_id"
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interface="zwlr_export_dmabuf_frame_v1"/>
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<arg name="source_id" type="uint"
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summary="the source_id to receive frames for"/>
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</request>
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<!-- TODO: Define this protocol error -->
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<request name="destroy" type="destructor">
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<description summary="destroy the manager">
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Destroys this zwlr_export_dmabuf_manager_v1 object.
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Destroying a bound zwlr_export_dmabuf_manager_v1 object while there are
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still zwlr_export_dmabuf_frame_v1 objects alive is illegal and will result
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in a protocol error.
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</description>
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</request>
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</interface>
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<interface name="zwlr_export_dmabuf_frame_v1" version="1">
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<interface name="zwlr_export_dmabuf_frame_v1" version="1">
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<description summary="a frame ready for readout">
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<description summary="exports dmabuf frames for readout">
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This object represents a frame which is ready to have its resources
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This interface sends the client events that describe new frames available from
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fetched and used.
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a source obtained via zwlr_export_dmabuf_manager_v1.
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The receive callback shall be called first, followed by the "object"
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This interface exposes underlying details of VASurfaceAttribExternalBuffers,
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callback once per dmabuf object or the "layer" callback, once per dmabuf
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part of the Linux DRM interface. In many respects, this interface is the
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layer. The "plane" callback shall only be called after the "layer"
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inverse of zwp_linux_buffer_params_v1. Unlike zwp_linux_buffer_params_v1, this
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callback corresponding to the layer the plane belongs to has been called
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also includes some additional information which, in the case of
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Finally, the "ready" event is called to indicate that all the data has
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zwp_linux_buffer_params_v1, is normally configured through e.g. wl_surface.
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been made available for readout, as well as the time at which presentation
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happened at. The ownership of the frame is passed to the client, who's
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The compositor will send events detailing the size, transform, pixel format,
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responsible for destroying it via the "destroy" event once finished.
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file descriptors, and so on, which can be used to read the next frame. When
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The data the API describes has been based off of what
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the frame is ready, the "ready" event is sent and includes details about the
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VASurfaceAttribExternalBuffers contains.
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presentation time of that frame. When the client is done reading the frame,
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All frames are read-only and may not be written into or altered.
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they must send the "finish" request.
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All frames are read-only and may not be written into or altered.
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</description>
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</description>
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<enum name="flags">
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<enum name="flags">
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<description summary="frame flags">
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<entry name="transient" value="0x1"
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Special flags that must be respected by the client.
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summary="a short-lived frame the client should copy and process later"/>
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Transient frames indicate short lifetime frames (such as swapchain
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images from external clients). Clients are advised to copy them and do
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all processing outside of the "ready" event.
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</description>
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<entry name="transient" value="0x1" since="1"/>
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</enum>
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</enum>
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<event name="frame">
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<event name="frame">
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<description summary="main callback">
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<description summary="sends details of the next frame">
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Main callback supplying the client with information about the frame,
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The frame event is sent to configure various details about the next frame.
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as well as an object to serve as context for destruction. Always called
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This event is always sent before the first ready event, but will not be
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first before any other events.
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re-sent if the details do not change between frames.
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The "transform" argument describes the orientation needed to be applied
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For details on the scale factor argument, see wl_surface::set_buffer_scale
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to correctly orient the buffer. For example, a buffer rotated by 90
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and wl_output::scale.
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degrees will have a value of "3" here, corresponding to the need to
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apply a 270 degree transpose to correctly present the buffer.
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</description>
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</description>
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<arg name="width" type="uint"
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<arg name="width" type="uint"
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summary="frame width, scaling factor included"/>
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summary="width in pixels of the next frame"/>
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<arg name="height" type="uint"
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<arg name="height" type="uint"
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summary="frame height, scaling factor included"/>
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summary="height in pixels of the next frame"/>
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<arg name="scale" type="uint"
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<arg name="scale" type="uint"
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summary="current scaling factor of the client"/>
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summary="scale factor of the next frame"/>
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<arg name="transform" type="uint"
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<arg name="transform" type="uint"
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summary="transform needed to correct the orientation, has the same
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summary="see wl_output.transform"/>
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values as wl_output::transform"/>
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<arg name="format" type="uint" summary="DRM_FORMAT code"/>
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<arg name="buffer_flags" type="uint"
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<arg name="buffer_flags" type="uint"
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summary="flags which indicate properties (invert, interlacing),
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summary="see zwp_linux_buffer_params_v1:flags"/>
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has the same values as zwp_linux_buffer_params_v1:flags"/>
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<arg name="flags" type="uint" enum="flags"
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<arg name="flags" type="uint" enum="flags"
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summary="indicates special frame features"/>
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summary="see enum flags"/>
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<arg name="mod_high" type="uint"
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summary="drm format modifier, high"/>
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<arg name="mod_low" type="uint"
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summary="drm format modifier, low"/>
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<arg name="num_objects" type="uint"
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<arg name="num_objects" type="uint"
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summary="indicates how many objects (FDs) the frame has (max 4)"/>
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summary="indicates how many objects (FDs) the frame has (max 4)"/>
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<arg name="num_layers" type="uint"
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<arg name="num_layers" type="uint"
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summary="indicates how many layers the frame has (max 4)"/>
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summary="indicates how many layers the frame has (max 4)"/>
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</event>
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</event>
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<event name="object">
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<description summary="object receiving callback">
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<event name="plane">
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Callback which serves to supply the client with the file descriptors
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<description summary="adds a plane to the next frame">
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containing the data for each object.
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Adds a new plane to the next frame, providing format information and a file
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descriptor it may be read from.
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The compositor must use consecutive plane indices from zero to the number of
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planes used by the drm_fourcc format code. All planes required by the format
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must be given exactly once, but can be given in any order. Each plane index
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can be set only once.
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Single-planar formats only require one dmabuf, however multi-planar formats
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may require more than one dmabuf. For all formats, data_source is sent once
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per plane (even if the underlying dmabuf fd is identical).
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The 64-bit unsigned value combined from modifier_hi and modifier_lo is the
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dmabuf layout modifier. DRM AddFB2 ioctl calls this the fb modifier, which
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is defined in drm_mode.h of Linux UAPI. This is an opaque token. Drivers
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use this token to express tiling, compression, etc. driver-specific
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modifications to the base format defined by the DRM fourcc code.
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This event is always sent before the first ready event, but will not be
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re-sent if the details do not change between frames.
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</description>
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</description>
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<arg name="index" type="uint"
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<arg name="index" type="uint"
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summary="index of the current object"/>
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summary="index of the current object"/>
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<arg name="fd" type="fd"
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<arg name="fd" type="fd"
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summary="fd of the current object"/>
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summary="fd of the current object"/>
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<arg name="size" type="uint"
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<arg name="offset" type="uint" summary="offset in bytes"/>
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summary="size in bytes for the current object"/>
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<arg name="stride" type="uint" summary="stride in bytes"/>
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<arg name="modifier_hi" type="uint"
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summary="drm format modifier, high"/>
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<arg name="modifier_lo" type="uint"
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summary="drm format modifier, low"/>
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</event>
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</event>
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<event name="layer">
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<description summary="layer receiving callback">
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<event name="position">
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Callback which serves to supply the client with information on what's
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<description summary="gives the position of child surfaces">
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contained in each file descriptor and how its laid out.
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For frame resources created from surfaces that are children of another
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Will be called after the main receive event, once per layer.
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source, this event is sent to indicate the position of the child surface in
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surface-local coordinates relative to its parent.
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This event is always sent before the first ready event, but will not be
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re-sent if the details do not change between frames. This event is never
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sent for sources which do not have parents.
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</description>
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</description>
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<arg name="index" type="uint"
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<arg name="x" type="int" summary="x coordinate in the parent surface"/>
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summary="index of the current plane"/>
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<arg name="y" type="int" summary="y coordinate in the parent surface"/>
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<arg name="format" type="uint"
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summary="format of the layer (DRM_FORMAT_*)"/>
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<arg name="num_planes" type="uint"
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summary="number of planes in the current layer (max 4)"/>
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</event>
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<event name="plane">
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<description summary="plane info receiving callback">
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Callback which supplies the client with plane information for each
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layer.
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</description>
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<arg name="index" type="uint"
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summary="index of the current plane"/>
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<arg name="layer_index" type="uint"
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summary="index of the current layer"/>
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<arg name="object_index" type="uint"
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summary="index of the object the plane applies to"/>
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<arg name="offset" type="uint"
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summary="starting point for the data in the object's fd"/>
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<arg name="stride" type="uint"
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summary="line size in bytes"/>
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</event>
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</event>
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<event name="ready">
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<event name="ready">
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<description summary="indicates frame is available for reading">
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<description summary="indicates frame is available for reading">
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Called as soon as the frame is presented, indicating it is available
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The ready event is sent when a frame is presented and is available for
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for reading.
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reading.
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The timestamp is expressed as tv_sec_hi, tv_sec_lo, tv_nsec triples,
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each component being an unsigned 32-bit value. Whole seconds are in
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The timestamp is expressed as tv_sec_hi, tv_sec_lo, tv_nsec triples, each
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tv_sec which is a 64-bit value combined from tv_sec_hi and tv_sec_lo,
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component being an unsigned 32-bit value. Whole seconds are in tv_sec which
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and the additional fractional part in tv_nsec as nanoseconds. Hence,
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is a 64-bit value combined from tv_sec_hi and tv_sec_lo, and the additional
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for valid timestamps tv_nsec must be in [0, 999999999].
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fractional part in tv_nsec as nanoseconds. Hence, for valid timestamps
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The seconds part may have an arbitrary offset at start.
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tv_nsec must be in [0, 999999999].
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Timestamps are accurate relative to each other, but have an undefined epoch.
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</description>
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</description>
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<arg name="tv_sec_hi" type="uint"
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<arg name="tv_sec_hi" type="uint"
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summary="high 32 bits of the seconds part of the timestamp"/>
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summary="high 32 bits of the seconds part of the timestamp"/>
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<arg name="tv_sec_lo" type="uint"
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<arg name="tv_sec_lo" type="uint"
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summary="low 32 bits of the seconds part of the timestamp"/>
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summary="low 32 bits of the seconds part of the timestamp"/>
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<arg name="tv_nsec" type="uint"
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<arg name="tv_nsec" type="uint"
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summary="nanoseconds part of the timestamp"/>
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summary="nanoseconds part of the timestamp"/>
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</event>
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</event>
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<enum name="abort_reason">
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<enum name="cancel_reason">
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<description summary="abort reason">
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<entry name="invalid_source" value="0"
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Indicates reason for aborting the frame.
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summary="the frame source is or has become invalid"/>
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</description>
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<entry name="invalid_frame" value="1"
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<entry name="invalid_source" value="0" since="1"
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summary="this frame is no longer valid"/>
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summary="invalid source, will not produce any (more) frames"/>
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<entry name="resizing" value="1" since="1"
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summary="source started being resized, this frame must be dropped,
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but source is still able to be captured"/>
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<entry name="security" value="2" since="1"
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summary="this frame must be dropped as sensitive data was present,
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however future capture may still succeed"/>
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</enum>
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</enum>
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<event name="abort">
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<event name="cancel">
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<description summary="indicates the frame is no longer valid">
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<description summary="indicates the frame is no longer valid">
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If the frame is no longer valid after the "frame" event has been called,
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The compositor will send this event to cancel the current frame.
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this callback will be used to inform the client to scrap the frame.
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Source is still valid for as long as the subscription function does not
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The reason is set to invalid_frame when only the current frame is invalid.
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return NULL.
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This would normally only happen if a client has attached a buffer (and thus
|
||||||
This may get called if for instance the surface is in the process of
|
the compositor passes along its information) but for some reason the frame
|
||||||
resizing.
|
was not rendered.
|
||||||
|
|
||||||
|
The reason is set to invalid_source if the underlying source has become
|
||||||
|
invalid. In this case, no frames will be sent to this resource after the
|
||||||
|
cancel event and the client should destroy the resource.
|
||||||
</description>
|
</description>
|
||||||
<arg name="reason" type="uint" enum="abort_reason"
|
<arg name="reason" type="uint" enum="cancel_reason"
|
||||||
summary="indicates a reason for aborting this frame capture"/>
|
summary="indicates the reason this frame was cancelled"/>
|
||||||
</event>
|
</event>
|
||||||
|
|
||||||
|
<!-- TODO: Add this protocol error -->
|
||||||
|
<request name="finish">
|
||||||
|
<description summary="the client has finished reading">
|
||||||
|
The client should send this request when it finishes reading the frame. It
|
||||||
|
is a protocol error to send finish before the ready event, or to send it
|
||||||
|
twice for a single frame.
|
||||||
|
</description>
|
||||||
|
</request>
|
||||||
|
|
||||||
<request name="destroy" type="destructor">
|
<request name="destroy" type="destructor">
|
||||||
<description summary="delete this object, used or not">
|
<description summary="releases the frame resource">
|
||||||
Unreferences the frame, allowing it to be reused. Must be called as soon
|
Informs the server that the client will no longer be using this protocol
|
||||||
as its no longer used.
|
object.
|
||||||
</description>
|
</description>
|
||||||
</request>
|
</request>
|
||||||
</interface>
|
</interface>
|
||||||
|
|
||||||
<interface name="zwlr_export_dmabuf_manager_v1" version="1">
|
|
||||||
<description summary="manager to inform clients and begin capturing">
|
|
||||||
This object is a manager which informs clients about capturable windows
|
|
||||||
and is able to create callbacks from which to begin to receive content
|
|
||||||
from. The "title" argument in the "surface_info" event shall be used
|
|
||||||
to provide a user-readable identifier such as a window title or
|
|
||||||
program name.
|
|
||||||
</description>
|
|
||||||
|
|
||||||
<event name="surface_info">
|
|
||||||
<description summary="get valid surfaces for capture">
|
|
||||||
This will be called whenever a surface that's able to be captured
|
|
||||||
appears.
|
|
||||||
</description>
|
|
||||||
<arg name="title" type="string"
|
|
||||||
summary="window title or an identifier"/>
|
|
||||||
<arg name="id" type="uint"
|
|
||||||
summary="an identifier to create a context with"/>
|
|
||||||
</event>
|
|
||||||
<event name="surface_unavailable">
|
|
||||||
<description summary="notifies of a surface being unavailable to capture">
|
|
||||||
Called if a surface becomes unavailable to capture, for example if has
|
|
||||||
been closed.
|
|
||||||
</description>
|
|
||||||
<arg name="id" type="uint"
|
|
||||||
summary="an identifier of the surface"/>
|
|
||||||
</event>
|
|
||||||
|
|
||||||
<request name="capture_client">
|
|
||||||
<description summary="subscribe to start capturing">
|
|
||||||
Request to start capturing from a surface with a given id.
|
|
||||||
</description>
|
|
||||||
<arg name="frame" type="new_id"
|
|
||||||
interface="zwlr_export_dmabuf_frame_v1"/>
|
|
||||||
<arg name="overlay_cursor" type="int"
|
|
||||||
summary="include custom client hardware cursor on top of the frame"/>
|
|
||||||
<arg name="id" type="uint"
|
|
||||||
summary="an identifier to start capturing from"/>
|
|
||||||
</request>
|
|
||||||
<request name="capture_output">
|
|
||||||
<description summary="subscribe to start capturing">
|
|
||||||
Request to start capturing from an entire wl_output.
|
|
||||||
</description>
|
|
||||||
<arg name="frame" type="new_id"
|
|
||||||
interface="zwlr_export_dmabuf_frame_v1"/>
|
|
||||||
<arg name="overlay_cursor" type="int"
|
|
||||||
summary="include custom client hardware cursor on top of the frame"/>
|
|
||||||
<arg name="output" type="object" interface="wl_output"/>
|
|
||||||
</request>
|
|
||||||
<request name="destroy" type="destructor">
|
|
||||||
<description summary="destroy the manager">
|
|
||||||
All objects created by the manager will still remain valid, until their
|
|
||||||
appropriate destroy request has been called.
|
|
||||||
</description>
|
|
||||||
</request>
|
|
||||||
</interface>
|
|
||||||
</protocol>
|
</protocol>
|
||||||
|
|
|
||||||
Loading…
Add table
Reference in a new issue