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LinuxKMS: Add support for synthetic display rotations (#4166)

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This patch adds support for the `SLINT_KMS_ROTATION` environment
variable, that instructs the Skia/FemtoVG renderers to rotate
the scene before rendering.
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Simon Hausmann 2023-12-18 17:49:05 +01:00 • committed by GitHub
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commit 3b51c8e30a
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18
docs/reference/src/advanced/backend_linuxkms.md
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@ -114,3 +114,21 @@ environment variables to configure support for different keyboards:
options section in
[xkeyboard-config(7)](https://manpages.debian.org/testing/xkb-data/xkeyboard-config.7.en.html) for a list of accepted option codes.
## Display Rotation
If your display's default orientation does not match the desired orientation of your user interface, then you can
set the `SLINT_KMS_ROTATION` environment variable to instruct Slint to rotate at rendering time. Supported values
are the rotation in degress: `0`, `90`, `180`, and `270`.
Note that this variable merely rotates the rendering output. If you're using a touch screen attached to the same
display, then you may need to configure it to also apply a rotation on the touch events generated. For configuring
libinput's `LIBINPUT_CALIBRATION_MATRIX` see the [libinput Documentation](https://wayland.freedesktop.org/libinput/doc/latest/device-configuration-via-udev.html#static-device-configuration-via-udev)
for a list of valid values. Values can typically be set by writing them into a rules file under `/etc/udev/rules.d`.
The following example configures libinput to apply a 90 degree clockwise rotation for any attached touch screen:
```bash
echo 'ENV{LIBINPUT_CALIBRATION_MATRIX}="0 -1 1 1 0 0"' > /etc/udev/rules.d/libinput.rules
udevadm control --reload-rules
udevadm trigger
```