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