handle cursor to output edge cases

include/wlr/types/wlr_output_layout.h

@@ -46,4 +46,10 @@ bool wlr_output_layout_contains_point(struct wlr_output_layout *layout,
 bool wlr_output_layout_intersects(struct wlr_output_layout *layout,
 		struct wlr_output *reference, int x1, int y1, int x2, int y2);
 
+/**
+ * Get the closest boundary point of this layout from the given point.
+ */
+void wlr_output_layout_closest_boundary(struct wlr_output_layout *layout,
+		int x, int y, int *dest_x, int *dest_y);
+
 #endif

types/wlr_cursor.c

@@ -73,7 +73,7 @@ void wlr_cursor_move(struct wlr_cursor *cur, double delta_x, double delta_y) {
 
 	// TODO handle no layout
 	assert(cur->state->layout);
-	// TODO handle layout boundaries
+
 	double new_x = cur->x + delta_x;
 	double new_y = cur->y + delta_y;
 	int hotspot_x = 0;
@@ -85,24 +85,28 @@ void wlr_cursor_move(struct wlr_cursor *cur, double delta_x, double delta_y) {
 		hotspot_y = image->hotspot_y;
 	}
 
-	if (wlr_output_layout_output_at(cur->state->layout, new_x, new_y)) {
+	if (!wlr_output_layout_output_at(cur->state->layout, new_x, new_y)) {
-		//struct wlr_output *output;
+		int closest_x, closest_y;
-		//output = wlr_output_layout_output_at(cur->state->layout, new_x, new_y);
+		wlr_output_layout_closest_boundary(cur->state->layout, new_x, new_y,
-		struct wlr_output_layout_output *l_output;
+			&closest_x, &closest_y);
-		wl_list_for_each(l_output, &cur->state->layout->outputs, link) {
+		new_x = closest_x;
-			int output_x = new_x;
+		new_y = closest_y;
-			int output_y = new_y;
+	}
+
+	struct wlr_output_layout_output *l_output;
+	wl_list_for_each(l_output, &cur->state->layout->outputs, link) {
+		int output_x = new_x;
+		int output_y = new_y;
 
-			// TODO fix double to int rounding issues
+		// TODO fix double to int rounding issues
-			wlr_output_layout_output_coords(cur->state->layout,
+		wlr_output_layout_output_coords(cur->state->layout,
 				l_output->output, &output_x, &output_y);
-			wlr_output_move_cursor(l_output->output, output_x - hotspot_x,
+		wlr_output_move_cursor(l_output->output, output_x - hotspot_x,
 				output_y - hotspot_y);
-		}
-
-		cur->x = new_x;
-		cur->y = new_y;
 	}
+
+	cur->x = new_x;
+	cur->y = new_y;
 }
 
 static void handle_pointer_motion(struct wl_listener *listener, void *data) {

types/wlr_output_layout.c

@@ -1,6 +1,7 @@
 #include <wlr/util/log.h>
 #include <wlr/types/wlr_output.h>
 #include <wlr/types/wlr_output_layout.h>
+#include <limits.h>
 #include <stdlib.h>
 #include <assert.h>
 
@@ -126,3 +127,48 @@ void wlr_output_layout_output_coords(struct wlr_output_layout *layout,
 		}
 	}
 }
+
+static double get_distance(double x1, double y1, double x2, double y2) {
+	double distance;
+	distance = sqrt((x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2));
+	return distance;
+}
+
+void wlr_output_layout_closest_boundary(struct wlr_output_layout *layout,
+		int x, int y, int *dest_x, int *dest_y) {
+	int min_x = INT_MAX, min_y = INT_MAX, min_distance = INT_MAX;
+	struct wlr_output_layout_output *l_output;
+	wl_list_for_each(l_output, &layout->outputs, link) {
+		int width, height, output_x, output_y, output_distance;
+		wlr_output_effective_resolution(l_output->output, &width, &height);
+
+		// find the closest x point
+		if (x < l_output->x) {
+			output_x = l_output->x;
+		} else if (x > l_output->x + width) {
+			output_x = l_output->x + width;
+		} else {
+			output_x = x;
+		}
+
+		// find closest y point
+		if (y < l_output->y) {
+			output_y = l_output->y;
+		} else if (y > l_output->y + height) {
+			output_y = l_output->y + height;
+		} else {
+			output_y = y;
+		}
+
+		// calculate distance
+		output_distance = get_distance(output_x, output_y, x, y);
+		if (output_distance < min_distance) {
+			min_x = output_x;
+			min_y = output_y;
+			min_distance = output_distance;
+		}
+	}
+
+	*dest_x = min_x;
+	*dest_y = min_y;
+}