Add calibration_matrix config option

Can be used to change the orientation of a touchscreen.

Example usage with swaymsg:

    # identity
    swaymsg input type:touch calibration_matrix '"1 0 0 0 1 0"'

    # 90 degree clockwise
    swaymsg input type:touch calibration_matrix '"0 -1 1 1 0 0"'

    # 180 degree clockwise
    swaymsg input type:touch calibration_matrix '"-1 0 1 0 -1 1"'

    # 270 degree clockwise
    swaymsg input type:touch calibration_matrix '"0 1 0 -1 0 1"'

Documentation:

    https://wayland.freedesktop.org/libinput/doc/latest/absolute-axes.html#calibration-of-absolute-devices

1 files changed, 5 insertions, 0 deletions

diff --git a/sway/config/input.c b/sway/config/input.c
index c4f64eb8..b5be4f26 100644
--- a/sway/config/input.c
+++ b/sway/config/input.c
@@ -132,6 +132,11 @@ void merge_input_config(struct input_config *dst, struct input_config *src) {
                 free(dst->mapped_to_output);
                 dst->mapped_to_output = strdup(src->mapped_to_output);
         }
+        if (src->calibration_matrix.configured) {
+                dst->calibration_matrix.configured = src->calibration_matrix.configured;
+                memcpy(dst->calibration_matrix.matrix, src->calibration_matrix.matrix,
+                        sizeof(src->calibration_matrix.matrix));
+        }
 }
 
 static bool validate_xkb_merge(struct input_config *dest,