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

2 files changed, 7 insertions, 0 deletions

diff --git a/include/sway/commands.h b/include/sway/commands.h
index 641f2504..ddee2994 100644
--- a/include/sway/commands.h
+++ b/include/sway/commands.h
@@ -237,6 +237,7 @@ sway_cmd bar_colors_cmd_urgent_workspace;
 
 sway_cmd input_cmd_seat;
 sway_cmd input_cmd_accel_profile;
+sway_cmd input_cmd_calibration_matrix;
 sway_cmd input_cmd_click_method;
 sway_cmd input_cmd_drag;
 sway_cmd input_cmd_drag_lock;
diff --git a/include/sway/config.h b/include/sway/config.h
index 9736a665..4adce8ab 100644
--- a/include/sway/config.h
+++ b/include/sway/config.h
@@ -101,6 +101,11 @@ struct input_config_mapped_from_region {
         bool mm;
 };
 
+struct calibration_matrix {
+        bool configured;
+        float matrix[6];
+};
+
 /**
  * options for input devices
  */
@@ -109,6 +114,7 @@ struct input_config {
         const char *input_type;
 
         int accel_profile;
+        struct calibration_matrix calibration_matrix;
         int click_method;
         int drag;
         int drag_lock;