99 lines
2.6 KiB
C
99 lines
2.6 KiB
C
/*
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* Copyright (C) 2006 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef SkEndian_DEFINED
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#define SkEndian_DEFINED
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#include "SkTypes.h"
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/** \file SkEndian.h
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Macros and helper functions for handling 16 and 32 bit values in
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big and little endian formats.
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*/
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#if defined(SK_CPU_LENDIAN) && defined(SK_CPU_BENDIAN)
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#error "can't have both LENDIAN and BENDIAN defined"
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#endif
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#if !defined(SK_CPU_LENDIAN) && !defined(SK_CPU_BENDIAN)
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#error "need either LENDIAN or BENDIAN defined"
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#endif
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/** Swap the two bytes in the low 16bits of the parameters.
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e.g. 0x1234 -> 0x3412
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*/
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inline uint16_t SkEndianSwap16(U16CPU value)
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{
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SkASSERT(value == (uint16_t)value);
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return (uint16_t)((value >> 8) | (value << 8));
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}
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/** Vector version of SkEndianSwap16(), which swaps the
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low two bytes of each value in the array.
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*/
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inline void SkEndianSwap16s(uint16_t array[], int count)
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{
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SkASSERT(count == 0 || array != NULL);
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while (--count >= 0)
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{
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*array = SkEndianSwap16(*array);
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array += 1;
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}
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}
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/** Reverse all 4 bytes in a 32bit value.
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e.g. 0x12345678 -> 0x78563412
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*/
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inline uint32_t SkEndianSwap32(uint32_t value)
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{
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return ((value & 0xFF) << 24) |
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((value & 0xFF00) << 8) |
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((value & 0xFF0000) >> 8) |
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(value >> 24);
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}
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/** Vector version of SkEndianSwap16(), which swaps the
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bytes of each value in the array.
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*/
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inline void SkEndianSwap32s(uint32_t array[], int count)
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{
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SkASSERT(count == 0 || array != NULL);
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while (--count >= 0)
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{
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*array = SkEndianSwap32(*array);
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array += 1;
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}
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}
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#ifdef SK_CPU_LENDIAN
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#define SkEndian_SwapBE16(n) SkEndianSwap16(n)
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#define SkEndian_SwapBE32(n) SkEndianSwap32(n)
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#define SkEndian_SwapLE16(n) (n)
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#define SkEndian_SwapLE32(n) (n)
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#else // SK_CPU_BENDIAN
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#define SkEndian_SwapBE16(n) (n)
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#define SkEndian_SwapBE32(n) (n)
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#define SkEndian_SwapLE16(n) SkEndianSwap16(n)
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#define SkEndian_SwapLE32(n) SkEndianSwap32(n)
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#endif
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#endif
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