Support pointer-gestures on Wayland backend

backend/wayland/backend.c

@@ -17,6 +17,7 @@
 #include "backend/wayland.h"
 #include "util/signal.h"
 #include "xdg-decoration-unstable-v1-client-protocol.h"
+#include "pointer-gestures-unstable-v1-client-protocol.h"
 #include "xdg-shell-client-protocol.h"
 
 struct wlr_wl_backend *get_wl_backend_from_backend(struct wlr_backend *backend) {
@@ -77,6 +78,9 @@ static void registry_global(void *data, struct wl_registry *registry,
 	} else if (strcmp(iface, zxdg_decoration_manager_v1_interface.name) == 0) {
 		wl->zxdg_decoration_manager_v1 = wl_registry_bind(registry, name,
 			&zxdg_decoration_manager_v1_interface, 1);
+	} else if (strcmp(iface, zwp_pointer_gestures_v1_interface.name) == 0) {
+		wl->zwp_pointer_gestures_v1 = wl_registry_bind(registry, name,
+			&zwp_pointer_gestures_v1_interface, 1);
 	}
 }
 
@@ -149,6 +153,9 @@ static void backend_destroy(struct wlr_backend *backend) {
 	if (wl->zxdg_decoration_manager_v1) {
 		zxdg_decoration_manager_v1_destroy(wl->zxdg_decoration_manager_v1);
 	}
+	if (wl->zwp_pointer_gestures_v1) {
+		zwp_pointer_gestures_v1_destroy(wl->zwp_pointer_gestures_v1);
+	}
 	xdg_wm_base_destroy(wl->xdg_wm_base);
 	wl_compositor_destroy(wl->compositor);
 	wl_registry_destroy(wl->registry);

backend/wayland/wl_seat.c

@@ -15,6 +15,7 @@
 #include <wlr/interfaces/wlr_touch.h>
 #include <wlr/util/log.h>
 
+#include "pointer-gestures-unstable-v1-client-protocol.h"
 #include "backend/wayland.h"
 #include "util/signal.h"
 
@@ -344,6 +345,107 @@ static struct wlr_pointer_impl pointer_impl = {
 	.destroy = pointer_destroy,
 };
 
+static void gesture_swipe_begin(void *data,
+		struct zwp_pointer_gesture_swipe_v1 *zwp_pointer_gesture_swipe_v1,
+		uint32_t serial, uint32_t time,
+		struct wl_surface *surface, uint32_t fingers) {
+	struct wlr_wl_input_device *input_device = (struct wlr_wl_input_device *)data;
+	struct wlr_input_device *wlr_dev = &input_device->wlr_input_device;
+	struct wlr_event_pointer_swipe_begin wlr_event = {
+		.device = wlr_dev,
+		.time_msec = time,
+		.fingers = fingers,
+	};
+	input_device->fingers = fingers;
+	wlr_signal_emit_safe(&wlr_dev->pointer->events.swipe_begin, &wlr_event);
+}
+
+static void gesture_swipe_update(void *data,
+		struct zwp_pointer_gesture_swipe_v1 *zwp_pointer_gesture_swipe_v1,
+		uint32_t time, wl_fixed_t dx, wl_fixed_t dy) {
+	struct wlr_wl_input_device *input_device = (struct wlr_wl_input_device *)data;
+	struct wlr_input_device *wlr_dev = &input_device->wlr_input_device;
+	struct wlr_event_pointer_swipe_update wlr_event = {
+		.device = wlr_dev,
+		.time_msec = time,
+		.fingers = input_device->fingers,
+		.dx = wl_fixed_to_double(dx),
+		.dy = wl_fixed_to_double(dy),
+	};
+	wlr_signal_emit_safe(&wlr_dev->pointer->events.swipe_update, &wlr_event);
+}
+
+static void gesture_swipe_end(void *data,
+		struct zwp_pointer_gesture_swipe_v1 *zwp_pointer_gesture_swipe_v1,
+		uint32_t serial, uint32_t time, int32_t cancelled) {
+	struct wlr_wl_input_device *input_device = (struct wlr_wl_input_device *)data;
+	struct wlr_input_device *wlr_dev = &input_device->wlr_input_device;
+	struct wlr_event_pointer_swipe_end wlr_event = {
+		.device = wlr_dev,
+		.time_msec = time,
+		.cancelled = cancelled,
+	};
+	wlr_signal_emit_safe(&wlr_dev->pointer->events.swipe_end, &wlr_event);
+}
+
+static struct zwp_pointer_gesture_swipe_v1_listener gesture_swipe_impl = {
+	.begin = gesture_swipe_begin,
+	.update = gesture_swipe_update,
+	.end = gesture_swipe_end,
+};
+
+static void gesture_pinch_begin(void *data,
+		struct zwp_pointer_gesture_pinch_v1 *zwp_pointer_gesture_pinch_v1,
+		uint32_t serial, uint32_t time,
+		struct wl_surface *surface, uint32_t fingers) {
+	struct wlr_wl_input_device *input_device = (struct wlr_wl_input_device *)data;
+	struct wlr_input_device *wlr_dev = &input_device->wlr_input_device;
+	struct wlr_event_pointer_pinch_begin wlr_event = {
+		.device = wlr_dev,
+		.time_msec = time,
+		.fingers = fingers,
+	};
+	input_device->fingers = fingers;
+	wlr_signal_emit_safe(&wlr_dev->pointer->events.pinch_begin, &wlr_event);
+}
+
+static void gesture_pinch_update(void *data,
+		struct zwp_pointer_gesture_pinch_v1 *zwp_pointer_gesture_pinch_v1,
+		uint32_t time, wl_fixed_t dx, wl_fixed_t dy, wl_fixed_t scale, wl_fixed_t rotation) {
+	struct wlr_wl_input_device *input_device = (struct wlr_wl_input_device *)data;
+	struct wlr_input_device *wlr_dev = &input_device->wlr_input_device;
+	struct wlr_event_pointer_pinch_update wlr_event = {
+		.device = wlr_dev,
+		.time_msec = time,
+		.fingers = input_device->fingers,
+		.dx = wl_fixed_to_double(dx),
+		.dy = wl_fixed_to_double(dy),
+		.scale = wl_fixed_to_double(scale),
+		.rotation = wl_fixed_to_double(rotation),
+	};
+	wlr_signal_emit_safe(&wlr_dev->pointer->events.pinch_update, &wlr_event);
+}
+
+static void gesture_pinch_end(void *data,
+		struct zwp_pointer_gesture_pinch_v1 *zwp_pointer_gesture_pinch_v1,
+		uint32_t serial, uint32_t time, int32_t cancelled) {
+	struct wlr_wl_input_device *input_device = (struct wlr_wl_input_device *)data;
+	struct wlr_input_device *wlr_dev = &input_device->wlr_input_device;
+	struct wlr_event_pointer_pinch_end wlr_event = {
+		.device = wlr_dev,
+		.time_msec = time,
+		.cancelled = cancelled,
+	};
+	wlr_signal_emit_safe(&wlr_dev->pointer->events.pinch_end, &wlr_event);
+}
+
+static struct zwp_pointer_gesture_pinch_v1_listener gesture_pinch_impl = {
+	.begin = gesture_pinch_begin,
+	.update = gesture_pinch_update,
+	.end = gesture_pinch_end,
+};
+
+
 static void pointer_handle_output_destroy(struct wl_listener *listener,
 		void *data) {
 	struct wlr_wl_pointer *pointer =
@@ -390,6 +492,15 @@ void create_wl_pointer(struct wl_pointer *wl_pointer, struct wlr_wl_output *outp
 	wlr_dev->output_name = strdup(output->wlr_output.name);
 	wlr_pointer_init(wlr_dev->pointer, &pointer_impl);
 
+	if (backend->zwp_pointer_gestures_v1) {
+		pointer->gesture_swipe = zwp_pointer_gestures_v1_get_swipe_gesture(
+				backend->zwp_pointer_gestures_v1, wl_pointer);
+		zwp_pointer_gesture_swipe_v1_add_listener(pointer->gesture_swipe, &gesture_swipe_impl, dev);
+		pointer->gesture_pinch = zwp_pointer_gestures_v1_get_pinch_gesture(
+				backend->zwp_pointer_gestures_v1, wl_pointer);
+		zwp_pointer_gesture_pinch_v1_add_listener(pointer->gesture_pinch, &gesture_pinch_impl, dev);
+	}
+
 	wlr_signal_emit_safe(&backend->backend.events.new_input, wlr_dev);
 }
 

include/backend/wayland.h

@@ -33,6 +33,7 @@ struct wlr_wl_backend {
 	struct wl_compositor *compositor;
 	struct xdg_wm_base *xdg_wm_base;
 	struct zxdg_decoration_manager_v1 *zxdg_decoration_manager_v1;
+	struct zwp_pointer_gestures_v1 *zwp_pointer_gestures_v1;
 	struct wl_seat *seat;
 	struct wl_pointer *pointer;
 	struct wl_keyboard *keyboard;
@@ -66,6 +67,7 @@ struct wlr_wl_output {
 
 struct wlr_wl_input_device {
 	struct wlr_input_device wlr_input_device;
+	uint32_t fingers;
 
 	struct wlr_wl_backend *backend;
 	void *resource;
@@ -76,6 +78,8 @@ struct wlr_wl_pointer {
 
 	struct wlr_wl_input_device *input_device;
 	struct wl_pointer *wl_pointer;
+	struct zwp_pointer_gesture_swipe_v1 *gesture_swipe;
+	struct zwp_pointer_gesture_pinch_v1 *gesture_pinch;
 	enum wlr_axis_source axis_source;
 	int32_t axis_discrete;
 	struct wlr_wl_output *output;

protocol/meson.build

@@ -44,6 +44,7 @@ client_protocols = [
 	[wl_protocol_dir, 'stable/xdg-shell/xdg-shell.xml'],
 	[wl_protocol_dir, 'unstable/idle-inhibit/idle-inhibit-unstable-v1.xml'],
 	[wl_protocol_dir, 'unstable/pointer-constraints/pointer-constraints-unstable-v1.xml'],
+	[wl_protocol_dir, 'unstable/pointer-gestures/pointer-gestures-unstable-v1.xml'],
 	[wl_protocol_dir, 'unstable/relative-pointer/relative-pointer-unstable-v1.xml'],
 	[wl_protocol_dir, 'unstable/text-input/text-input-unstable-v3.xml'],
 	[wl_protocol_dir, 'unstable/xdg-decoration/xdg-decoration-unstable-v1.xml'],