Implement pointer-constraints protocol in wlroots and rootston

include/wlr/types/wlr_box.h

@@ -9,6 +9,7 @@
 #ifndef WLR_TYPES_WLR_BOX_H
 #define WLR_TYPES_WLR_BOX_H
 
+#include <pixman.h>
 #include <stdbool.h>
 #include <wayland-server.h>
 
@@ -40,4 +41,6 @@ void wlr_box_transform(const struct wlr_box *box,
 void wlr_box_rotated_bounds(const struct wlr_box *box, float rotation,
 	struct wlr_box *dest);
 
+void wlr_box_from_pixman_box32(const pixman_box32_t box, struct wlr_box *dest);
+
 #endif

include/wlr/types/wlr_cursor.h

@@ -91,6 +91,18 @@ bool wlr_cursor_warp(struct wlr_cursor *cur, struct wlr_input_device *dev,
 void wlr_cursor_absolute_to_layout_coords(struct wlr_cursor *cur,
 	struct wlr_input_device *dev, double x, double y, double *lx, double *ly);
 
+
+/**
+ * Warp the cursor to the given x and y coordinates. If the given point is out
+ * of the layout boundaries or constraints, the closest point will be used.
+ * If one coordinate is NAN, it will be ignored.
+ *
+ * `dev` may be passed to respect device mapping constraints. If `dev` is NULL,
+ * device mapping constraints will be ignored.
+ */
+void wlr_cursor_warp_closest(struct wlr_cursor *cur,
+	struct wlr_input_device *dev, double x, double y);
+
 /**
  * Warp the cursor to the given x and y in absolute 0..1 coordinates. If the
  * given point is out of the layout boundaries or constraints, the closest point

include/wlr/types/wlr_pointer_constraints_v1.h

@@ -0,0 +1,88 @@
+#ifndef WLR_TYPES_WLR_POINTER_CONSTRAINTS_V1_H
+#define WLR_TYPES_WLR_POINTER_CONSTRAINTS_V1_H
+
+#include <stdint.h>
+#include <wayland-server.h>
+#include <pixman.h>
+#include <wlr/types/wlr_box.h>
+#include <wlr/types/wlr_seat.h>
+#include "pointer-constraints-unstable-v1-protocol.h"
+
+struct wlr_seat;
+
+enum wlr_pointer_constraint_v1_type {
+	WLR_POINTER_CONSTRAINT_V1_LOCKED,
+	WLR_POINTER_CONSTRAINT_V1_CONFINED,
+};
+
+struct wlr_pointer_constraint_v1_state {
+	pixman_region32_t *region;
+
+	// only valid for locked_pointer
+	struct {
+		double x, y;
+		bool valid;
+	} cursor_hint;
+};
+
+struct wlr_pointer_constraint_v1 {
+	struct wlr_pointer_constraints_v1 *pointer_constraints;
+
+	struct wl_resource *resource;
+	struct wlr_surface *surface;
+	struct wlr_seat *seat;
+	enum zwp_pointer_constraints_v1_lifetime lifetime;
+	enum wlr_pointer_constraint_v1_type type;
+	pixman_region32_t region;
+
+	struct wlr_pointer_constraint_v1_state current, pending;
+
+	struct wl_listener surface_commit;
+	struct wl_listener surface_destroy;
+	struct wl_listener seat_destroy;
+
+	struct wl_list link; // wlr_pointer_constraints_v1::constraints
+
+	void *data;
+};
+
+struct wlr_pointer_constraints_v1 {
+	struct wl_list wl_resources; // wl_resource_get_link
+	struct wl_global *wl_global;
+
+	struct {
+		/**
+		 * Called when a new pointer constraint is created.
+		 *
+		 * data: wlr_pointer_constraint_v1*
+		 */
+		struct wl_signal constraint_create;
+		/**
+		 * Called when a pointer constraint is destroyed.
+		 *
+		 * data: wlr_pointer_constraint_v1*
+		 */
+		struct wl_signal constraint_destroy;
+	} events;
+
+	struct wl_list constraints; // wlr_pointer_constraint_v1::link
+
+	void *data;
+};
+
+struct wlr_pointer_constraints_v1 *wlr_pointer_constraints_v1_create(
+	struct wl_display *display);
+void wlr_pointer_constraints_v1_destroy(
+	struct wlr_pointer_constraints_v1 *wlr_pointer_constraints_v1);
+
+struct wlr_pointer_constraint_v1 *wlr_pointer_constraints_v1_constraint_for_surface(
+	struct wlr_pointer_constraints_v1 *wlr_pointer_constraints_v1,
+	struct wlr_surface *surface, struct wlr_seat *seat);
+
+void wlr_pointer_constraint_v1_send_activated(
+	struct wlr_pointer_constraint_v1 *constraint);
+void wlr_pointer_constraint_v1_send_deactivated(
+	struct wlr_pointer_constraint_v1 *constraint);
+
+
+#endif

include/wlr/types/wlr_region.h

@@ -10,8 +10,7 @@
 #define WLR_TYPES_WLR_REGION_H
 
 #include <pixman.h>
-
-struct wl_resource;
+#include <wayland-server-protocol.h>
 
 /*
  * Creates a new region resource with the provided new ID. If `resource_list` is

include/wlr/util/region.h

@@ -16,6 +16,8 @@
 
 #ifndef WLR_UTIL_REGION_H
 #define WLR_UTIL_REGION_H
+
+#include <stdbool.h>
 #include <pixman.h>
 #include <wayland-server.h>
 
@@ -48,4 +50,7 @@ void wlr_region_expand(pixman_region32_t *dst, pixman_region32_t *src,
 void wlr_region_rotated_bounds(pixman_region32_t *dst, pixman_region32_t *src,
 	float rotation, int ox, int oy);
 
+bool wlr_region_confine(pixman_region32_t *region, double x1, double y1, double x2,
+	double y2, double *x2_out, double *y2_out);
+
 #endif