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202 lines
9.3 KiB
202 lines
9.3 KiB
<?xml version="1.0" encoding="UTF-8"?>
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<protocol name="wlr_export_dmabuf_unstable_v1">
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<copyright>
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Copyright © 2018 Rostislav Pehlivanov
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Permission is hereby granted, free of charge, to any person obtaining a
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copy of this software and associated documentation files (the "Software"),
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to deal in the Software without restriction, including without limitation
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the rights to use, copy, modify, merge, publish, distribute, sublicense,
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and/or sell copies of the Software, and to permit persons to whom the
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Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice (including the next
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paragraph) shall be included in all copies or substantial portions of the
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Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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DEALINGS IN THE SOFTWARE.
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</copyright>
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<description summary="a protocol for low overhead screen content capturing">
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An interface to capture surfaces in an efficient way.
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Overall usage:
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1.) client registers with zwlr_screencontent_manager_v1
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2.) server sends client info about surfaces via "receive_surface_info"
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3.) client subscribes to capture a surface via the "capture" requests
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4.) server sends client events via the "zwlr_screencontent_frame" interface
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5.) client finishes and informs server via the "frame_destroy" event
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6.) client optionally resubscribes via repeating steps 3.) through 5.)
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</description>
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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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This object represents a frame which is ready to have its resources
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fetched and used.
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The receive callback shall be called first, followed by the "object"
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callback once per dmabuf object or the "plane" callback, once per dmabuf
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plane. The "ready" event is called last to indicate that all the data has
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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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responsible for destroying it via the "destroy" event once finished and
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by calling close() on the file descriptors received.
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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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<enum name="flags">
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<description summary="frame flags">
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Special flags that should be respected by the client.
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</description>
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<entry name="transient" value="0x1" since="1"
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summary="clients should copy frame before processing"/>
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</enum>
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<event name="frame">
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<description summary="main callback">
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Main callback supplying the client with information about the frame,
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as well as an object to serve as context for destruction. Always called
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first before any other events.
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The "transform" argument describes the orientation needed to be applied
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to correctly orient the buffer. For example, a buffer rotated by 90
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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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<arg name="width" type="uint"
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summary="frame width, scaling factor included"/>
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<arg name="height" type="uint"
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summary="frame height, scaling factor included"/>
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<arg name="offset_x" type="uint"
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summary="crop offset for the x axis"/>
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<arg name="offset_y" type="uint"
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summary="crop offset for the y axis"/>
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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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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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summary="indicates special frame features"/>
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<arg name="format" type="uint"
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summary="format of the frame (DRM_FORMAT_*)"/>
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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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summary="indicates how many objects (FDs) the frame has (max 4)"/>
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<arg name="num_planes" type="uint"
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summary="indicates how many planes the frame has (max 4)"/>
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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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Callback which serves to supply the client with the file descriptors
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containing the data for each object.
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</description>
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<arg name="index" type="uint"
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summary="index of the current object"/>
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<arg name="fd" type="fd"
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summary="fd of the current object"/>
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<arg name="size" type="uint"
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summary="size in bytes for the current object"/>
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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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plane.
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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="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 name="ready">
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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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for 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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tv_sec which is a 64-bit value combined from tv_sec_hi and tv_sec_lo,
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and the additional fractional part in tv_nsec as nanoseconds. Hence,
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for valid timestamps tv_nsec must be in [0, 999999999].
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The seconds part may have an arbitrary offset at start.
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</description>
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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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<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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<arg name="tv_nsec" type="uint"
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summary="nanoseconds part of the timestamp"/>
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</event>
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<enum name="cancel_reason">
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<description summary="cancel reason">
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Indicates reason for cancelling the frame.
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</description>
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<entry name="temporary" value="0" since="1"
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summary="temporary error, source will produce more frames"/>
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<entry name="pernament" value="1" since="1"
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summary="fatal error, source will not produce frames"/>
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<entry name="resizing" value="2" since="1"
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summary="temporary error, source will produce frames"/>
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</enum>
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<event name="cancel">
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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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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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return NULL.
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This may get called if for instance the surface is in the process of
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resizing.
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</description>
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<arg name="reason" type="uint" enum="cancel_reason"
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summary="indicates a reason for cancelling this frame capture"/>
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</event>
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<request name="destroy" type="destructor">
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<description summary="delete this object, used or not">
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Unreferences the frame, allowing it to be reused. Must be called as soon
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as its no longer used.
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Can be called at any time by the client after the "frame" event, after
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which the compositor will not call any other events unless the client
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resubscribes to capture more. The client will still have to close any
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FDs it has been given.
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</description>
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</request>
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</interface>
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<interface name="zwlr_export_dmabuf_manager_v1" version="1">
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<description summary="manager to inform clients and begin capturing">
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This object is a manager with which to start capturing from sources.
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</description>
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<request name="capture_output">
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<description summary="subscribe to start capturing">
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Request to start capturing from an entire wl_output.
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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="overlay_cursor" type="int"
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summary="include custom client hardware cursor on top of the frame"/>
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<arg name="output" type="object" interface="wl_output"/>
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</request>
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<request name="destroy" type="destructor">
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<description summary="destroy the manager">
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All objects created by the manager will still remain valid, until their
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appropriate destroy request has been called.
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</description>
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</request>
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</interface>
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</protocol>
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