wayland-protocols: Add pointer_stylus_exists error to zcr_stylus_v1 interface.

third_party/wayland-protocols/include/protocol/stylus-unstable-v1-server-protocol.h

 /* Generated by wayland-scanner 1.11.0 */
 
 #ifndef STYLUS_UNSTABLE_V1_SERVER_PROTOCOL_H
 #define STYLUS_UNSTABLE_V1_SERVER_PROTOCOL_H
 
 #include <stdint.h>
 #include <stddef.h>
 #include "wayland-server.h"
 
 #ifdef  __cplusplus
@@ skipping 91 matching lines @@
  * See @ref iface_zcr_pointer_stylus_v1.
  */
 /**
  * @defgroup iface_zcr_pointer_stylus_v1 The zcr_pointer_stylus_v1 interface
  *
  * The zcr_pointer_stylus_v1 interface extends the wl_pointer interface with
  * events to describe details about a stylus acting as a pointer.
  */
 extern const struct wl_interface zcr_pointer_stylus_v1_interface;
 
+#ifndef ZCR_STYLUS_V1_ERROR_ENUM
+#define ZCR_STYLUS_V1_ERROR_ENUM
+enum zcr_stylus_v1_error {
+        /**
+         * the pointer already has a pointer_stylus object associated
+         */
+        ZCR_STYLUS_V1_ERROR_POINTER_STYLUS_EXISTS = 0,
+};
+#endif /* ZCR_STYLUS_V1_ERROR_ENUM */
+
 /**
  * @ingroup iface_zcr_stylus_v1
  * @struct zcr_stylus_v1_interface
  */
 struct zcr_stylus_v1_interface {
         /**
          * get stylus interface for pointer
          *
          * Create pointer_stylus object. See zcr_pointer_stylus_v1
-         * interface for details.
+         * interface for details. If the given wl_pointer already has a
+         * pointer_stylus object associated, the pointer_stylus_exists
+         * protocol error is raised.
          */
         void (*get_pointer_stylus)(struct wl_client *client,
                                    struct wl_resource *resource,
                                    uint32_t id,
                                    struct wl_resource *pointer);
 };
 
 
 #ifndef ZCR_POINTER_STYLUS_V1_TOOL_TYPE_ENUM
 #define ZCR_POINTER_STYLUS_V1_TOOL_TYPE_ENUM
@@ skipping 89 matching lines @@
 zcr_pointer_stylus_v1_send_tilt(struct wl_resource *resource_, uint32_t time, wl_fixed_t tilt_x, wl_fixed_t tilt_y)
 {
         wl_resource_post_event(resource_, ZCR_POINTER_STYLUS_V1_TILT, time, tilt_x, tilt_y);
 }
 
 #ifdef  __cplusplus
 }
 #endif
 
 #endif