dom/base/nsTextFragmentImpl.h

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