зеркало из https://github.com/mozilla/gecko-dev.git
34 строки
1.3 KiB
C++
34 строки
1.3 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef nsTextFragmentImpl_h__
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#define nsTextFragmentImpl_h__
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#include <stdint.h>
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template<size_t size> struct Non8BitParameters;
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template<> struct Non8BitParameters<4> {
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static inline size_t mask() { return 0xff00ff00; }
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static inline uint32_t alignMask() { return 0x3; }
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static inline uint32_t numUnicharsPerWord() { return 2; }
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};
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template<> struct Non8BitParameters<8> {
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static inline size_t mask() {
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static const uint64_t maskAsUint64 = 0xff00ff00ff00ff00ULL;
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// We have to explicitly cast this 64-bit value to a size_t, or else
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// compilers for 32-bit platforms will warn about it being too large to fit
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// in the size_t return type. (Fortunately, this code isn't actually
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// invoked on 32-bit platforms -- they'll use the <4> specialization above.
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// So it is, in fact, OK that this value is too large for a 32-bit size_t.)
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return (size_t)maskAsUint64;
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}
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static inline uint32_t alignMask() { return 0x7; }
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static inline uint32_t numUnicharsPerWord() { return 4; }
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};
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#endif
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