1  /*
       2  
       3  Copyright 1990, 1994, 1998  The Open Group
       4  
       5  Permission to use, copy, modify, distribute, and sell this software and its
       6  documentation for any purpose is hereby granted without fee, provided that
       7  the above copyright notice appear in all copies and that both that
       8  copyright notice and this permission notice appear in supporting
       9  documentation.
      10  
      11  The above copyright notice and this permission notice shall be included in
      12  all copies or substantial portions of the Software.
      13  
      14  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
      15  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
      16  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
      17  OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
      18  AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
      19  CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
      20  
      21  Except as contained in this notice, the name of The Open Group shall not be
      22  used in advertising or otherwise to promote the sale, use or other dealings
      23  in this Software without prior written authorization from The Open Group.
      24  
      25  */
      26  /* $XFree86: xc/lib/font/util/utilbitmap.c,v 1.3 1999/08/22 08:58:58 dawes Exp $ */
      27  
      28  /*
      29   * Author:  Keith Packard, MIT X Consortium
      30   */
      31  
      32  /* Modified for use with FreeType */
      33  
      34  
      35  #include "pcfutil.h"
      36  
      37  
      38    /*
      39     * Invert bit order within each BYTE of an array.
      40     */
      41  
      42    FT_LOCAL_DEF( void )
      43    BitOrderInvert( unsigned char*  buf,
      44                    size_t          nbytes )
      45    {
      46      for ( ; nbytes > 0; nbytes--, buf++ )
      47      {
      48        unsigned int  val = *buf;
      49  
      50  
      51        val = ( ( val >> 1 ) & 0x55 ) | ( ( val << 1 ) & 0xAA );
      52        val = ( ( val >> 2 ) & 0x33 ) | ( ( val << 2 ) & 0xCC );
      53        val = ( ( val >> 4 ) & 0x0F ) | ( ( val << 4 ) & 0xF0 );
      54  
      55        *buf = (unsigned char)val;
      56      }
      57    }
      58  
      59  
      60  #if defined( __clang__ )                                            || \
      61      ( defined( __GNUC__ )                                          &&  \
      62        ( __GNUC__ > 4 || ( __GNUC__ == 4 && __GNUC_MINOR__ >= 8 ) ) )
      63  
      64  #define BSWAP16( x )  __builtin_bswap16( x )
      65  #define BSWAP32( x )  __builtin_bswap32( x )
      66  
      67  #elif defined( _MSC_VER ) && _MSC_VER >= 1300
      68  
      69  #pragma intrinsic( _byteswap_ushort )
      70  #pragma intrinsic( _byteswap_ulong )
      71  
      72  #define BSWAP16( x )  _byteswap_ushort( x )
      73  #define BSWAP32( x )  _byteswap_ulong( x )
      74  
      75  #else
      76  
      77  #define BSWAP16( x )                             \
      78          (FT_UInt16)( ( ( ( x ) >> 8 ) & 0xff ) | \
      79                       ( ( ( x ) & 0xff ) << 8 ) )
      80  #define BSWAP32( x )                   \
      81          (FT_UInt32)( ( ( ( x ) & 0xff000000u ) >> 24 ) | \
      82                       ( ( ( x ) & 0x00ff0000u ) >> 8  ) | \
      83                       ( ( ( x ) & 0x0000ff00u ) << 8  ) | \
      84                       ( ( ( x ) & 0x000000ffu ) << 24 ) )
      85  
      86  #endif
      87  
      88    /*
      89     * Invert byte order within each 16-bits of an array.
      90     */
      91  
      92    FT_LOCAL_DEF( void )
      93    TwoByteSwap( unsigned char*  buf,
      94                 size_t          nbytes )
      95    {
      96      FT_UInt16*  b = (FT_UInt16*)buf;
      97  
      98  
      99      for ( ; nbytes >= 2; nbytes -= 2, b++ )
     100        *b = BSWAP16( *b );
     101    }
     102  
     103    /*
     104     * Invert byte order within each 32-bits of an array.
     105     */
     106  
     107    FT_LOCAL_DEF( void )
     108    FourByteSwap( unsigned char*  buf,
     109                  size_t          nbytes )
     110    {
     111      FT_UInt32*  b = (FT_UInt32*)buf;
     112  
     113  
     114      for ( ; nbytes >= 4; nbytes -= 4, b++ )
     115        *b = BSWAP32( *b );
     116    }
     117  
     118  
     119  /* END */