in src/libguac/protocol.c [791:817]
int guac_protocol_send_lstroke(guac_socket* socket,
guac_composite_mode mode, const guac_layer* layer,
guac_line_cap_style cap, guac_line_join_style join, int thickness,
const guac_layer* srcl) {
int ret_val;
guac_socket_instruction_begin(socket);
ret_val =
guac_socket_write_string(socket, "7.lstroke,")
|| __guac_socket_write_length_int(socket, mode)
|| guac_socket_write_string(socket, ",")
|| __guac_socket_write_length_int(socket, layer->index)
|| guac_socket_write_string(socket, ",")
|| __guac_socket_write_length_int(socket, cap)
|| guac_socket_write_string(socket, ",")
|| __guac_socket_write_length_int(socket, join)
|| guac_socket_write_string(socket, ",")
|| __guac_socket_write_length_int(socket, thickness)
|| guac_socket_write_string(socket, ",")
|| __guac_socket_write_length_int(socket, srcl->index)
|| guac_socket_write_string(socket, ";");
guac_socket_instruction_end(socket);
return ret_val;
}