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191 lines
7.3 KiB
C
191 lines
7.3 KiB
C
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/*====================================================================*
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- Copyright (C) 2001 Leptonica. All rights reserved.
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- This software is distributed in the hope that it will be
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- useful, but with NO WARRANTY OF ANY KIND.
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- No author or distributor accepts responsibility to anyone for the
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- consequences of using this software, or for whether it serves any
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- particular purpose or works at all, unless he or she says so in
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- writing. Everyone is granted permission to copy, modify and
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- redistribute this source code, for commercial or non-commercial
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- purposes, with the following restrictions: (1) the origin of this
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- source code must not be misrepresented; (2) modified versions must
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- be plainly marked as such; and (3) this notice may not be removed
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- or altered from any source or modified source distribution.
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*====================================================================*/
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#ifndef LEPTONICA_ARRAY_ACCESS_H
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#define LEPTONICA_ARRAY_ACCESS_H
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/*
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* arrayaccess.h
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*
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* 1, 2, 4, 8, 16 and 32 bit data access within an array of 32-bit words
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*
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* This is used primarily to access 1, 2, 4, 8, 16 and 32 bit pixels
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* in a line of image data, represented as an array of 32-bit words.
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*
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* pdata: pointer to first 32-bit word in the array
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* n: index of the pixel in the array
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*
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* Function calls for these accessors are defined in arrayaccess.c.
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*
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* However, for efficiency we use the inline macros for all accesses.
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* Even though the 2 and 4 bit set* accessors are more complicated,
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* they are about 10% faster than the function calls.
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*
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* The 32 bit access is just a cast and ptr arithmetic. We include
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* it so that the input ptr can be void*.
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*
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* At the end of this file is code for invoking the function calls
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* instead of inlining.
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*
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* The macro SET_DATA_BIT_VAL(pdata, n, val) is a bit slower than
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* if (val == 0)
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* CLEAR_DATA_BIT(pdata, n);
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* else
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* SET_DATA_BIT(pdata, n);
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*/
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#if 1 /* Inline Accessors */
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#ifndef _MSC_VER
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/*--------------------------------------------------*
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* 1 bit access *
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*--------------------------------------------------*/
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#define GET_DATA_BIT(pdata, n) \
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((*((l_uint32 *)(pdata) + ((n) >> 5)) >> (31 - ((n) & 31))) & 1)
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#define SET_DATA_BIT(pdata, n) \
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(*((l_uint32 *)(pdata) + ((n) >> 5)) |= (0x80000000 >> ((n) & 31)))
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#define CLEAR_DATA_BIT(pdata, n) \
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(*((l_uint32 *)(pdata) + ((n) >> 5)) &= ~(0x80000000 >> ((n) & 31)))
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#define SET_DATA_BIT_VAL(pdata, n, val) \
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({l_uint32 *_TEMP_WORD_PTR_; \
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_TEMP_WORD_PTR_ = (l_uint32 *)(pdata) + ((n) >> 5); \
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*_TEMP_WORD_PTR_ &= ~(0x80000000 >> ((n) & 31)); \
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*_TEMP_WORD_PTR_ |= ((val) << (31 - ((n) & 31))); \
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})
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/*--------------------------------------------------*
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* 2 bit access *
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*--------------------------------------------------*/
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#define GET_DATA_DIBIT(pdata, n) \
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((*((l_uint32 *)(pdata) + ((n) >> 4)) >> (2 * (15 - ((n) & 15)))) & 3)
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#define SET_DATA_DIBIT(pdata, n, val) \
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({l_uint32 *_TEMP_WORD_PTR_; \
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_TEMP_WORD_PTR_ = (l_uint32 *)(pdata) + ((n) >> 4); \
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*_TEMP_WORD_PTR_ &= ~(0xc0000000 >> (2 * ((n) & 15))); \
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*_TEMP_WORD_PTR_ |= (((val) & 3) << (30 - 2 * ((n) & 15))); \
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})
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#define CLEAR_DATA_DIBIT(pdata, n) \
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(*((l_uint32 *)(pdata) + ((n) >> 4)) &= ~(0xc0000000 >> (2 * ((n) & 15))))
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/*--------------------------------------------------*
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* 4 bit access *
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*--------------------------------------------------*/
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#define GET_DATA_QBIT(pdata, n) \
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((*((l_uint32 *)(pdata) + ((n) >> 3)) >> (4 * (7 - ((n) & 7)))) & 0xf)
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#define SET_DATA_QBIT(pdata, n, val) \
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({l_uint32 *_TEMP_WORD_PTR_; \
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_TEMP_WORD_PTR_ = (l_uint32 *)(pdata) + ((n) >> 3); \
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*_TEMP_WORD_PTR_ &= ~(0xf0000000 >> (4 * ((n) & 7))); \
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*_TEMP_WORD_PTR_ |= (((val) & 15) << (28 - 4 * ((n) & 7))); \
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})
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#define CLEAR_DATA_QBIT(pdata, n) \
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(*((l_uint32 *)(pdata) + ((n) >> 3)) &= ~(0xf0000000 >> (4 * ((n) & 7))))
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/*--------------------------------------------------*
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* 8 bit access *
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*--------------------------------------------------*/
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#ifdef L_BIG_ENDIAN
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#define GET_DATA_BYTE(pdata, n) \
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(*((l_uint8 *)(pdata) + (n)))
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#else /* L_LITTLE_ENDIAN */
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#define GET_DATA_BYTE(pdata, n) \
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(*(l_uint8 *)((l_uintptr_t)((l_uint8 *)(pdata) + (n)) ^ 3))
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#endif /* L_BIG_ENDIAN */
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#ifdef L_BIG_ENDIAN
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#define SET_DATA_BYTE(pdata, n, val) \
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(*((l_uint8 *)(pdata) + (n)) = (val))
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#else /* L_LITTLE_ENDIAN */
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#define SET_DATA_BYTE(pdata, n, val) \
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(*(l_uint8 *)((l_uintptr_t)((l_uint8 *)(pdata) + (n)) ^ 3) = (val))
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#endif /* L_BIG_ENDIAN */
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/*--------------------------------------------------*
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* 16 bit access *
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*--------------------------------------------------*/
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#ifdef L_BIG_ENDIAN
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#define GET_DATA_TWO_BYTES(pdata, n) \
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(*((l_uint16 *)(pdata) + (n)))
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#else /* L_LITTLE_ENDIAN */
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#define GET_DATA_TWO_BYTES(pdata, n) \
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(*(l_uint16 *)((l_uintptr_t)((l_uint16 *)(pdata) + (n)) ^ 2))
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#endif /* L_BIG_ENDIAN */
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#ifdef L_BIG_ENDIAN
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#define SET_DATA_TWO_BYTES(pdata, n, val) \
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(*((l_uint16 *)(pdata) + (n)) = (val))
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#else /* L_LITTLE_ENDIAN */
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#define SET_DATA_TWO_BYTES(pdata, n, val) \
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(*(l_uint16 *)((l_uintptr_t)((l_uint16 *)(pdata) + (n)) ^ 2) = (val))
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#endif /* L_BIG_ENDIAN */
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/*--------------------------------------------------*
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* 32 bit access *
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*--------------------------------------------------*/
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#define GET_DATA_FOUR_BYTES(pdata, n) \
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(*((l_uint32 *)(pdata) + (n)))
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#define SET_DATA_FOUR_BYTES(pdata, n, val) \
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(*((l_uint32 *)(pdata) + (n)) = (val))
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#endif /* ! _MSC_VER */
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#endif /* Inline Accessors */
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/*--------------------------------------------------*
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* Slower, using function calls for all accessors *
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*--------------------------------------------------*/
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#if 0 || defined(_MSC_VER)
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#define GET_DATA_BIT(pdata, n) l_getDataBit(pdata, n)
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#define SET_DATA_BIT(pdata, n) l_setDataBit(pdata, n)
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#define CLEAR_DATA_BIT(pdata, n) l_clearDataBit(pdata, n)
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#define SET_DATA_BIT_VAL(pdata, n, val) l_setDataBitVal(pdata, n, val)
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#define GET_DATA_DIBIT(pdata, n) l_getDataDibit(pdata, n)
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#define SET_DATA_DIBIT(pdata, n, val) l_setDataDibit(pdata, n, val)
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#define CLEAR_DATA_DIBIT(pdata, n) l_clearDataDibit(pdata, n)
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#define GET_DATA_QBIT(pdata, n) l_getDataQbit(pdata, n)
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#define SET_DATA_QBIT(pdata, n, val) l_setDataQbit(pdata, n, val)
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#define CLEAR_DATA_QBIT(pdata, n) l_clearDataQbit(pdata, n)
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#define GET_DATA_BYTE(pdata, n) l_getDataByte(pdata, n)
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#define SET_DATA_BYTE(pdata, n, val) l_setDataByte(pdata, n, val)
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#define GET_DATA_TWO_BYTES(pdata, n) l_getDataTwoBytes(pdata, n)
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#define SET_DATA_TWO_BYTES(pdata, n, val) l_setDataTwoBytes(pdata, n, val)
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#define GET_DATA_FOUR_BYTES(pdata, n) l_getDataFourBytes(pdata, n)
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#define SET_DATA_FOUR_BYTES(pdata, n, val) l_setDataFourBytes(pdata, n, val)
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#endif
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#endif /* LEPTONICA_ARRAY_ACCESS_H */
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