wlr screencopy
This protocol allows clients to ask the compositor to copy part of the screen content to a client 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.
zwlr_screencopy_manager_v1
This object is a manager which offers requests to start capturing from a source.
capture_output(frame: new_id<zwlr_screencopy_frame_v1>, overlay_cursor: int, output: object<wl_output>)
Argument | Type | Description |
|---|---|---|
| frame | new_id<zwlr_screencopy_frame_v1> | |
| overlay_cursor | int | composite cursor onto the frame |
| output | object<wl_output> |
Capture the next frame of an entire output.
capture_output_region(frame: new_id<zwlr_screencopy_frame_v1>, overlay_cursor: int, output: object<wl_output>, x: int, y: int, width: int, height: int)
Argument | Type | Description |
|---|---|---|
| frame | new_id<zwlr_screencopy_frame_v1> | |
| overlay_cursor | int | composite cursor onto the frame |
| output | object<wl_output> | |
| x | int | |
| y | int | |
| width | int | |
| height | int |
Capture the next frame of an output's region.
The region is given in output logical coordinates, see xdg_output.logical_size. The region will be clipped to the output's extents.
destroy()
All objects created by the manager will still remain valid, until their appropriate destroy request has been called.
zwlr_screencopy_frame_v1
This object represents a single frame.
When created, a series of buffer events will be sent, each representing a supported buffer type. The "buffer_done" event is sent afterwards to indicate that all supported buffer types have been enumerated. The client will then be able to send a "copy" request. If the capture is successful, the compositor will send a "flags" followed by a "ready" event.
For objects version 2 or lower, wl_shm buffers are always supported, ie. the "buffer" event is guaranteed to be sent.
If the capture failed, the "failed" event is sent. This can happen anytime before the "ready" event.
Once either a "ready" or a "failed" event is received, the client should destroy the frame.
Copy the frame to the supplied buffer. The buffer must have a the correct size, see zwlr_screencopy_frame_v1.buffer and zwlr_screencopy_frame_v1.linux_dmabuf. The buffer needs to have a supported format.
If the frame is successfully copied, a "flags" and a "ready" events are sent. Otherwise, a "failed" event is sent.
destroy()
Destroys the frame. This request can be sent at any time by the client.
Same as copy, except it waits until there is damage to copy.
buffer(format: uint<wl_shm.format>, width: uint, height: uint, stride: uint)
Argument | Type | Description |
|---|---|---|
| format | uint<wl_shm.format> | buffer format |
| width | uint | buffer width |
| height | uint | buffer height |
| stride | uint | buffer stride |
Provides information about wl_shm buffer parameters that need to be used for this frame. This event is sent once after the frame is created if wl_shm buffers are supported.
flags(flags: uint<zwlr_screencopy_frame_v1.flags>)
Argument | Type | Description |
|---|---|---|
| flags | uint<zwlr_screencopy_frame_v1.flags> | frame flags |
Provides flags about the frame. This event is sent once before the "ready" event.
Argument | Type | Description |
|---|---|---|
| tv_sec_hi | uint | high 32 bits of the seconds part of the timestamp |
| tv_sec_lo | uint | low 32 bits of the seconds part of the timestamp |
| tv_nsec | uint | nanoseconds part of the timestamp |
Called as soon as the frame is copied, indicating it is available for reading. This event includes the time at which presentation happened at.
The timestamp is expressed as tv_sec_hi, tv_sec_lo, tv_nsec triples, each component being an unsigned 32-bit value. Whole seconds are in tv_sec which is a 64-bit value combined from tv_sec_hi and tv_sec_lo, and the additional fractional part in tv_nsec as nanoseconds. Hence, for valid timestamps tv_nsec must be in [0, 999999999]. The seconds part may have an arbitrary offset at start.
After receiving this event, the client should destroy the object.
failed()
This event indicates that the attempted frame copy has failed.
After receiving this event, the client should destroy the object.
Argument | Type | Description |
|---|---|---|
| x | uint | damaged x coordinates |
| y | uint | damaged y coordinates |
| width | uint | current width |
| height | uint | current height |
This event is sent right before the ready event when copy_with_damage is requested. It may be generated multiple times for each copy_with_damage request.
The arguments describe a box around an area that has changed since the last copy request that was derived from the current screencopy manager instance.
The union of all regions received between the call to copy_with_damage and a ready event is the total damage since the prior ready event.
Provides information about linux-dmabuf buffer parameters that need to be used for this frame. This event is sent once after the frame is created if linux-dmabuf buffers are supported.
buffer_done()
This event is sent once after all buffer events have been sent.
The client should proceed to create a buffer of one of the supported types, and send a "copy" request.
error { already_used, invalid_buffer }
Argument | Value | Description |
|---|---|---|
| already_used | 0 | the object has already been used to copy a wl_buffer |
| invalid_buffer | 1 | buffer attributes are invalid |
flags { y_invert }
Argument | Value | Description |
|---|---|---|
| y_invert | 1 | contents are y-inverted |
Compositor Support
Mutter  46 | KWin  6.2 | Sway  1.9 | COSMIC  1.0.0 | Hyprland  0.42.0 | niri 0.1.8 | Weston  13 | Mir  2.18 | GameScope  3.15.14 | Jay 1.7.0 | |
|---|---|---|---|---|---|---|---|---|---|---|
| zwlr_screencopy_manager_v1 | x | x | 3 | x | 3 | 3 | x | 3 | x | 3 |
Copyright
Copyright © 2018 Simon Ser Copyright © 2019 Andri Yngvason
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice (including the next paragraph) shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.