rootston: fix input events for rotated views

rootston/desktop.c

@@ -51,22 +51,8 @@ static bool view_at(struct roots_view *view, double lx, double ly,
 
 	double view_sx = lx - view->box.x;
 	double view_sy = ly - view->box.y;
-
-	struct wlr_surface_state *state = &view->wlr_surface->current;
-	struct wlr_box box = {
-		.x = 0, .y = 0,
-		.width = state->width, .height = state->height,
-	};
-	if (view->rotation != 0.0) {
-		// Coordinates relative to the center of the view
-		double ox = view_sx - (double)box.width/2,
-			oy = view_sy - (double)box.height/2;
-		// Rotated coordinates
-		double rx = cos(view->rotation)*ox + sin(view->rotation)*oy,
-			ry = cos(view->rotation)*oy - sin(view->rotation)*ox;
-		view_sx = rx + (double)box.width/2;
-		view_sy = ry + (double)box.height/2;
-	}
+	rotate_child_position(&view_sx, &view_sy, 0, 0,
+		view->box.width, view->box.height, -view->rotation);
 
 	double _sx, _sy;
 	struct wlr_surface *_surface = NULL;

rootston/output.c

@@ -30,11 +30,11 @@ void rotate_child_position(double *sx, double *sy, double sw, double sh,
 	}
 
 	// Coordinates relative to the center of the subsurface
-	double ox = *sx - pw/2 + sw/2,
-		oy = *sy - ph/2 + sh/2;
+	double cx = *sx - pw/2 + sw/2,
+		cy = *sy - ph/2 + sh/2;
 	// Rotated coordinates
-	double rx = cos(rotation)*ox - sin(rotation)*oy,
-		ry = cos(rotation)*oy + sin(rotation)*ox;
+	double rx = cos(rotation)*cx - sin(rotation)*cy,
+		ry = cos(rotation)*cy + sin(rotation)*cx;
 	*sx = rx + pw/2 - sw/2;
 	*sy = ry + ph/2 - sh/2;
 }