Line data    Source code

       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> struct Non8BitParameters;
      13             : template<> struct Non8BitParameters<4> {
      14             :   static inline size_t mask() { return 0xff00ff00; }
      15             :   static inline uint32_t alignMask() { return 0x3; }
      16             :   static inline uint32_t numUnicharsPerWord() { return 2; }
      17             : };
      18             : 
      19             : template<> struct Non8BitParameters<8> {
      20         151 :   static inline size_t mask() {
      21             :     static const uint64_t maskAsUint64 = 0xff00ff00ff00ff00ULL;
      22             :     // We have to explicitly cast this 64-bit value to a size_t, or else
      23             :     // compilers for 32-bit platforms will warn about it being too large to fit
      24             :     // in the size_t return type. (Fortunately, this code isn't actually
      25             :     // invoked on 32-bit platforms -- they'll use the <4> specialization above.
      26             :     // So it is, in fact, OK that this value is too large for a 32-bit size_t.)
      27         151 :     return (size_t)maskAsUint64;
      28             :   }
      29           0 :   static inline uint32_t alignMask() { return 0x7; }
      30         151 :   static inline uint32_t numUnicharsPerWord() { return 4; }
      31             : };
      32             : 
      33             : #endif