Add libinput RotationAngle

This patch adds the libinput option RotationAngle to sway.

Signoff-by: Lucas Zampieri <lzampier@redhat.com>

include/sway/commands.h

@@ -262,6 +262,7 @@ sway_cmd input_cmd_map_to_region;
 sway_cmd input_cmd_middle_emulation;
 sway_cmd input_cmd_natural_scroll;
 sway_cmd input_cmd_pointer_accel;
+sway_cmd input_cmd_rotation_angle;
 sway_cmd input_cmd_scroll_factor;
 sway_cmd input_cmd_repeat_delay;
 sway_cmd input_cmd_repeat_rate;

include/sway/config.h

@@ -155,6 +155,7 @@ struct input_config {
 	int middle_emulation;
 	int natural_scroll;
 	float pointer_accel;
+	float rotation_angle;
 	float scroll_factor;
 	int repeat_delay;
 	int repeat_rate;

sway/commands/input.c

@@ -23,6 +23,7 @@ static const struct cmd_handler input_handlers[] = {
 	{ "middle_emulation", input_cmd_middle_emulation },
 	{ "natural_scroll", input_cmd_natural_scroll },
 	{ "pointer_accel", input_cmd_pointer_accel },
+	{ "rotation_angle", input_cmd_rotation_angle },
 	{ "repeat_delay", input_cmd_repeat_delay },
 	{ "repeat_rate", input_cmd_repeat_rate },
 	{ "scroll_button", input_cmd_scroll_button },

sway/commands/input/rotation_angle.c

@@ -0,0 +1,29 @@
+#include <math.h>
+#include <stdlib.h>
+#include <string.h>
+#include "sway/config.h"
+#include "sway/commands.h"
+#include "sway/input/input-manager.h"
+#include "util.h"
+
+struct cmd_results *input_cmd_rotation_angle(int argc, char **argv) {
+	struct cmd_results *error = NULL;
+	if ((error = checkarg(argc, "rotation_angle", EXPECTED_AT_LEAST, 1))) {
+		return error;
+	}
+	struct input_config *ic = config->handler_context.input_config;
+	if (!ic) {
+		return cmd_results_new(CMD_FAILURE, "No input device defined.");
+	}
+
+	float rotation_angle = parse_float(argv[0]);
+	if (isnan(rotation_angle)) {
+		return cmd_results_new(CMD_INVALID,
+			"Invalid rotation_angle; expected float.");
+	} if (rotation_angle < 0 || rotation_angle > 360) {
+		return cmd_results_new(CMD_INVALID, "Input out of range [0, 360)");
+	}
+	ic->rotation_angle = rotation_angle;
+
+	return cmd_results_new(CMD_SUCCESS, NULL);
+}

sway/config/input.c

@@ -31,6 +31,7 @@ struct input_config *new_input_config(const char* identifier) {
 	input->middle_emulation = INT_MIN;
 	input->natural_scroll = INT_MIN;
 	input->accel_profile = INT_MIN;
+	input->rotation_angle = FLT_MIN;
 	input->pointer_accel = FLT_MIN;
 	input->scroll_factor = FLT_MIN;
 	input->scroll_button = INT_MIN;
@@ -74,6 +75,9 @@ void merge_input_config(struct input_config *dst, struct input_config *src) {
 	if (src->natural_scroll != INT_MIN) {
 		dst->natural_scroll = src->natural_scroll;
 	}
+	if (src->rotation_angle != FLT_MIN) {
+		dst->rotation_angle = src->rotation_angle;
+	}
 	if (src->pointer_accel != FLT_MIN) {
 		dst->pointer_accel = src->pointer_accel;
 	}

sway/input/libinput.c

@@ -79,6 +79,16 @@ static bool set_accel_speed(struct libinput_device *device, double speed) {
 	return true;
 }
 
+static bool set_rotation_angle(struct libinput_device *device, double angle) {
+	if (!libinput_device_config_rotation_is_available(device) ||
+			libinput_device_config_rotation_get_angle(device) == angle) {
+		return false;
+	}
+	sway_log(SWAY_DEBUG, "rotation_set_angle(%f)", angle);
+	log_status(libinput_device_config_rotation_set_angle(device, angle));
+	return true;
+}
+
 static bool set_accel_profile(struct libinput_device *device,
 		enum libinput_config_accel_profile profile) {
 	if (!libinput_device_config_accel_is_available(device) ||
@@ -241,6 +251,9 @@ bool sway_input_configure_libinput_device(struct sway_input_device *input_device
 	if (ic->pointer_accel != FLT_MIN) {
 		changed |= set_accel_speed(device, ic->pointer_accel);
 	}
+	if (ic->rotation_angle != FLT_MIN) {
+		changed |= set_rotation_angle(device, ic->rotation_angle);
+	}
 	if (ic->accel_profile != INT_MIN) {
 		changed |= set_accel_profile(device, ic->accel_profile);
 	}
@@ -298,6 +311,8 @@ void sway_input_reset_libinput_device(struct sway_input_device *input_device) {
 		libinput_device_config_tap_get_default_drag_lock_enabled(device));
 	changed |= set_accel_speed(device,
 		libinput_device_config_accel_get_default_speed(device));
+	changed |= set_rotation_angle(device,
+		libinput_device_config_rotation_get_default_angle(device));
 	changed |= set_accel_profile(device,
 		libinput_device_config_accel_get_default_profile(device));
 	changed |= set_natural_scroll(device,

sway/meson.build

@@ -167,6 +167,7 @@ sway_sources = files(
 	'commands/input/middle_emulation.c',
 	'commands/input/natural_scroll.c',
 	'commands/input/pointer_accel.c',
+        'commands/input/rotation_angle.c',
 	'commands/input/repeat_delay.c',
 	'commands/input/repeat_rate.c',
 	'commands/input/scroll_button.c',

sway/sway-input.5.scd

@@ -175,6 +175,10 @@ The following commands may only be used in the configuration file.
 *input* <identifier> pointer_accel [<-1|1>]
 	Changes the pointer acceleration for the specified input device.
 
+*input* <identifier> rotation_angle <angle>
+	Sets the rotation angle of the device to the given clockwise angle in
+	degrees. The angle must be between 0.0 (inclusive) and 360.0 (exclusive).
+
 *input* <identifier> scroll_button disable|button[1-3,8,9]|<event-code-or-name>
 	Sets the button used for scroll_method on_button_down. The button can
 	be given as an event name or code, which can be obtained from *libinput