dom/base/nsTextFragmentImpl.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #ifndef nsTextFragmentImpl_h__
   8 #define nsTextFragmentImpl_h__
   9
  10 #include <stdint.h>
  11
  12 template <size_t size>
  13 struct Non8BitParameters;
  14 template <>
  15 struct Non8BitParameters<4> {
  16   static inline size_t mask() { return 0xff00ff00; }
  17   static inline uint32_t alignMask() { return 0x3; }
  18   static inline uint32_t numUnicharsPerWord() { return 2; }
  19 };
  20
  21 template <>
  22 struct Non8BitParameters<8> {
  23   static inline size_t mask() {
  24     static const uint64_t maskAsUint64 = 0xff00ff00ff00ff00ULL;
  25     // We have to explicitly cast this 64-bit value to a size_t, or else
  26     // compilers for 32-bit platforms will warn about it being too large to fit
  27     // in the size_t return type. (Fortunately, this code isn't actually
  28     // invoked on 32-bit platforms -- they'll use the <4> specialization above.
  29     // So it is, in fact, OK that this value is too large for a 32-bit size_t.)
  30     return (size_t)maskAsUint64;
  31   }
  32   static inline uint32_t alignMask() { return 0x7; }
  33   static inline uint32_t numUnicharsPerWord() { return 4; }
  34 };
  35
  36 #endif