NAME

       wl-mirror - a simple Wayland output mirror client

SYNOPSIS

       wl-mirror [-h,-V,-v,-c,-i,-f,-s S,-b B,-t T,-r R,-S] <output>

OPTIONS

       -h, --help
           Show help message and exit.

       -V, --version
           Show version information and exit.

       -v, --verbose
           --no-verbose
           Enable or disable debug logging.

       -c, --show-cursor
           --no-show-cursor
           Show the cursor on the mirrored surface (enabled by default).

       -i, --invert-colors
           --no-invert-colors
           Invert colors on the mirrored surface.

       -f, --freeze
           --unfreeze
           --toggle-freeze
           Freeze, unfreeze, or toggle freezing of the current image on the screen.

       -s l, --scaling linear
           Use linear scaling (enabled by default).

       -s n, --scaling nearest
           Use nearest-neighbor scaling.

       -s e, --scaling exact
           Use exact multiple scaling (and if necessary add letterboxing). Uses nearest neighbor
           scaling for downscaling.

       -b B, --backend B
           Use a specific screen capture backend, see BACKENDS.

       -t T, --transform T
           Apply custom transform (rotation and flipping), see TRANSFORMS.

       -r R, --region R
           Capture custom screen region R, see REGIONS.

       -S, --stream
           Accept a stream of additional options on stdin, see STREAM MODE.

BACKENDS

       auto
           Automatically try backends in order and use the first that works (enabled by default).
           The next backend is selected automatically when the current backend fails to capture a
           frame 10 times in a row.

       dmabuf
           Use the wlr-export-dmabuf-unstable-v1 protocol to capture outputs (requires wlroots).
           This backend keeps the image data on the GPU and does not need expensive copies to the
           CPU and back.

       screencopy
           Use the wlr-screencopy-unstable-v1 protocol to capture outputs (requires wlroots) This
           backend passes the image data via shared memory on the CPU, but may have better
           compatibility with complex GPU driver configurations (e.g., multi GPU).

TRANSFORMS

       Transforms are specified as a dash-separated list of flips followed by a rotation amount.
       Flips are applied before rotations, both flips and rotations are optional. Custom
       transformations are applied after adjusting for the wayland output transform, so that if
       no custom transformations are applied, the mirrored surface is displayed right-side-up.

       normal
           No transformation (default transformation).

       flipX, flipY
           Flip the X or Y coordinate of the image, i.e. flipX means the mirrored surface has
           left and right swapped.

       0cw, 90cw, 180cw, 270cw
           Apply a clockwise rotation.

       0ccw, 90ccw, 180ccw, 270ccw
           Apply a counter-clockwise rotation.

       The following transformation options are provided for compatibility with sway-output(5)
       transforms:

       flipped
           Same as flipX.

       0, 90, 180, 270
           Same as 0cw, 90cw, 180cw, 270cw.

REGIONS

       Regions are specified in the format used by the slurp(1) utility:

           'x,y widthxheight [output]'

       When processing the region option, the region is translated into output coordinates, so
       when the output moves, the captured region moves with it. When a region is specified, the
       output positional argument is optional.

STREAM MODE

       In stream mode, wl-mirror interprets lines on stdin as additional command line options.

       •   Arguments can be quoted with single or double quotes, but every argument must be fully
           quoted.
       •   Unquoted arguments are split on whitespace.
       •   No escape sequences are implemented.

       Option lines on stdin are processed asynchronously, and can override all options and the
       captured output. Stream mode is used by wl-present(1) to add interactive controls to wl-
       mirror.

AUTHORS

       Maintained by Ferdinand Bachmann <theferdi265@gmail.com>. More information on wl-mirror
       can be found at <https://github.com/Ferdi265/wl-mirror>.

SEE ALSO

       wl-present(1) slurp(1) sway-output(5)

                                            2023-08-11                               wl-mirror(1)