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