/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim: set ts=8 sts=2 et sw=2 tw=80: */

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef nsTextFragmentImpl_h__

#define nsTextFragmentImpl_h__

#include <stdint.h>

template<size_t size> struct Non8BitParameters;

template<> struct Non8BitParameters<4> {

  static inline size_t mask() { return 0xff00ff00; }

  static inline uint32_t alignMask() { return 0x3; }

  static inline uint32_t numUnicharsPerWord() { return 2; }

};

template<> struct Non8BitParameters<8> {

  static inline size_t mask() {

    static const uint64_t maskAsUint64 = 0xff00ff00ff00ff00ULL;

    // We have to explicitly cast this 64-bit value to a size_t, or else

    // compilers for 32-bit platforms will warn about it being too large to fit

    // in the size_t return type. (Fortunately, this code isn't actually

    // invoked on 32-bit platforms -- they'll use the <4> specialization above.

    // So it is, in fact, OK that this value is too large for a 32-bit size_t.)

    return (size_t)maskAsUint64;

  }

  static inline uint32_t alignMask() { return 0x7; }

  static inline uint32_t numUnicharsPerWord() { return 4; }

};

#endif