Implement the pointer-gestures-unstable-v1 protocol

This protocol relays touchpad gesture events produced by libinput to
supporting clients (e.g. Evince, Eye of GNOME).

7 files changed, 152 insertions, 0 deletions

diff --git a/include/backend/libinput.h b/include/backend/libinput.h
index f4886956..ddb81a5a 100644
--- a/include/backend/libinput.h
+++ b/include/backend/libinput.h
@@ -54,6 +54,18 @@ void handle_pointer_button(struct libinput_event *event,
 		struct libinput_device *device);
 void handle_pointer_axis(struct libinput_event *event,
 		struct libinput_device *device);
+void handle_pointer_swipe_begin(struct libinput_event *event,
+		struct libinput_device *device);
+void handle_pointer_swipe_update(struct libinput_event *event,
+		struct libinput_device *device);
+void handle_pointer_swipe_end(struct libinput_event *event,
+		struct libinput_device *device);
+void handle_pointer_pinch_begin(struct libinput_event *event,
+		struct libinput_device *device);
+void handle_pointer_pinch_update(struct libinput_event *event,
+		struct libinput_device *device);
+void handle_pointer_pinch_end(struct libinput_event *event,
+		struct libinput_device *device);
 
 struct wlr_switch *create_libinput_switch(
 		struct libinput_device *device);
diff --git a/include/rootston/cursor.h b/include/rootston/cursor.h
index d1db6856..0d6b6014 100644
--- a/include/rootston/cursor.h
+++ b/include/rootston/cursor.h
@@ -39,6 +39,12 @@ struct roots_cursor {
 	struct wl_listener button;
 	struct wl_listener axis;
 	struct wl_listener frame;
+	struct wl_listener swipe_begin;
+	struct wl_listener swipe_update;
+	struct wl_listener swipe_end;
+	struct wl_listener pinch_begin;
+	struct wl_listener pinch_update;
+	struct wl_listener pinch_end;
 
 	struct wl_listener touch_down;
 	struct wl_listener touch_up;
diff --git a/include/rootston/desktop.h b/include/rootston/desktop.h
index 56d2a129..d8fc53e2 100644
--- a/include/rootston/desktop.h
+++ b/include/rootston/desktop.h
@@ -15,6 +15,7 @@
 #include <wlr/types/wlr_list.h>
 #include <wlr/types/wlr_output_layout.h>
 #include <wlr/types/wlr_output.h>
+#include <wlr/types/wlr_pointer_gestures_v1.h>
 #include <wlr/types/wlr_presentation_time.h>
 #include <wlr/types/wlr_gtk_primary_selection.h>
 #include <wlr/types/wlr_relative_pointer_v1.h>
@@ -67,6 +68,7 @@ struct roots_desktop {
 	struct wlr_presentation *presentation;
 	struct wlr_foreign_toplevel_manager_v1 *foreign_toplevel_manager_v1;
 	struct wlr_relative_pointer_manager_v1 *relative_pointer_manager;
+	struct wlr_pointer_gestures_v1 *pointer_gestures;
 
 	struct wl_listener new_output;
 	struct wl_listener layout_change;
diff --git a/include/wlr/types/meson.build b/include/wlr/types/meson.build
index 86f128b6..82715ad1 100644
--- a/include/wlr/types/meson.build
+++ b/include/wlr/types/meson.build
@@ -25,6 +25,7 @@ install_headers(
 	'wlr_output_layout.h',
 	'wlr_output.h',
 	'wlr_pointer_constraints_v1.h',
+	'wlr_pointer_gestures_v1.h',
 	'wlr_pointer.h',
 	'wlr_presentation_time.h',
 	'wlr_primary_selection.h',
diff --git a/include/wlr/types/wlr_cursor.h b/include/wlr/types/wlr_cursor.h
index 6475669c..192ba8a0 100644
--- a/include/wlr/types/wlr_cursor.h
+++ b/include/wlr/types/wlr_cursor.h
@@ -52,6 +52,12 @@ struct wlr_cursor {
 		struct wl_signal button;
 		struct wl_signal axis;
 		struct wl_signal frame;
+		struct wl_signal swipe_begin;
+		struct wl_signal swipe_update;
+		struct wl_signal swipe_end;
+		struct wl_signal pinch_begin;
+		struct wl_signal pinch_update;
+		struct wl_signal pinch_end;
 
 		struct wl_signal touch_up;
 		struct wl_signal touch_down;
diff --git a/include/wlr/types/wlr_pointer.h b/include/wlr/types/wlr_pointer.h
index 9dfe7aaa..486e1bc9 100644
--- a/include/wlr/types/wlr_pointer.h
+++ b/include/wlr/types/wlr_pointer.h
@@ -24,6 +24,12 @@ struct wlr_pointer {
 		struct wl_signal button;
 		struct wl_signal axis;
 		struct wl_signal frame;
+		struct wl_signal swipe_begin;
+		struct wl_signal swipe_update;
+		struct wl_signal swipe_end;
+		struct wl_signal pinch_begin;
+		struct wl_signal pinch_update;
+		struct wl_signal pinch_end;
 	} events;
 
 	void *data;
@@ -71,4 +77,50 @@ struct wlr_event_pointer_axis {
 	int32_t delta_discrete;
 };
 
+struct wlr_event_pointer_swipe_begin {
+	struct wlr_input_device *device;
+	uint32_t time_msec;
+	uint32_t fingers;
+};
+
+struct wlr_event_pointer_swipe_update {
+	struct wlr_input_device *device;
+	uint32_t time_msec;
+	uint32_t fingers;
+	// Relative coordinates of the logical center of the gesture
+	// compared to the previous event.
+	double dx, dy;
+};
+
+struct wlr_event_pointer_swipe_end {
+	struct wlr_input_device *device;
+	uint32_t time_msec;
+	bool cancelled;
+};
+
+struct wlr_event_pointer_pinch_begin {
+	struct wlr_input_device *device;
+	uint32_t time_msec;
+	uint32_t fingers;
+};
+
+struct wlr_event_pointer_pinch_update {
+	struct wlr_input_device *device;
+	uint32_t time_msec;
+	uint32_t fingers;
+	// Relative coordinates of the logical center of the gesture
+	// compared to the previous event.
+	double dx, dy;
+	// Absolute scale compared to the begin event
+	double scale;
+	// Relative angle in degrees clockwise compared to the previous event.
+	double rotation;
+};
+
+struct wlr_event_pointer_pinch_end {
+	struct wlr_input_device *device;
+	uint32_t time_msec;
+	bool cancelled;
+};
+
 #endif
diff --git a/include/wlr/types/wlr_pointer_gestures_v1.h b/include/wlr/types/wlr_pointer_gestures_v1.h
new file mode 100644
index 00000000..7caf0f53
--- /dev/null
+++ b/include/wlr/types/wlr_pointer_gestures_v1.h
@@ -0,0 +1,73 @@
+/*
+ * This an unstable interface of wlroots. No guarantees are made regarding the
+ * future consistency of this API.
+ */
+#ifndef WLR_USE_UNSTABLE
+#error "Add -DWLR_USE_UNSTABLE to enable unstable wlroots features"
+#endif
+
+#ifndef WLR_TYPES_WLR_POINTER_GESTURES_V1_H
+#define WLR_TYPES_WLR_POINTER_GESTURES_V1_H
+
+#include <wayland-server.h>
+#include <wlr/types/wlr_seat.h>
+#include <wlr/types/wlr_surface.h>
+
+struct wlr_pointer_gestures_v1 {
+	struct wl_global *global;
+	struct wl_list resources; // wl_resource_get_link
+	struct wl_list swipes;    // wl_resource_get_link
+	struct wl_list pinches;   // wl_resource_get_link
+
+	struct wl_listener display_destroy;
+
+	struct {
+		struct wl_signal destroy;
+	} events;
+
+	void *data;
+};
+
+struct wlr_pointer_gestures_v1 *wlr_pointer_gestures_v1_create(
+	struct wl_display *display);
+
+void wlr_pointer_gestures_v1_send_swipe_begin(
+	struct wlr_pointer_gestures_v1 *gestures,
+	struct wlr_seat *seat,
+	uint32_t time_msec,
+	uint32_t fingers);
+void wlr_pointer_gestures_v1_send_swipe_update(
+	struct wlr_pointer_gestures_v1 *gestures,
+	struct wlr_seat *seat,
+	uint32_t time_msec,
+	double dx,
+	double dy);
+void wlr_pointer_gestures_v1_send_swipe_end(
+	struct wlr_pointer_gestures_v1 *gestures,
+	struct wlr_seat *seat,
+	uint32_t time_msec,
+	bool cancelled);
+
+void wlr_pointer_gestures_v1_send_pinch_begin(
+	struct wlr_pointer_gestures_v1 *gestures,
+	struct wlr_seat *seat,
+	uint32_t time_msec,
+	uint32_t fingers);
+void wlr_pointer_gestures_v1_send_pinch_update(
+	struct wlr_pointer_gestures_v1 *gestures,
+	struct wlr_seat *seat,
+	uint32_t time_msec,
+	double dx,
+	double dy,
+	double scale,
+	double rotation);
+void wlr_pointer_gestures_v1_send_pinch_end(
+	struct wlr_pointer_gestures_v1 *gestures,
+	struct wlr_seat *seat,
+	uint32_t time_msec,
+	bool cancelled);
+
+void wlr_pointer_gestures_v1_destroy(
+	struct wlr_pointer_gestures_v1 *pointer_gestures_v1);
+
+#endif