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 <ft2build.h>

    36 #include "pcfutil.h"

    37 

    38 

    39   /*

    40    *  Invert bit order within each BYTE of an array.

    41    */

    42 

    43   FT_LOCAL_DEF( void )

    44   BitOrderInvert( unsigned char*  buf,

    45                   size_t          nbytes )

    46   {

    47     for ( ; nbytes > 0; nbytes--, buf++ )

    48     {

    49       unsigned int  val = *buf;

    50 

    51 

    52       val = ( ( val >> 1 ) & 0x55 ) | ( ( val << 1 ) & 0xAA );

    53       val = ( ( val >> 2 ) & 0x33 ) | ( ( val << 2 ) & 0xCC );

    54       val = ( ( val >> 4 ) & 0x0F ) | ( ( val << 4 ) & 0xF0 );

    55 

    56       *buf = (unsigned char)val;

    57     }

    58   }

    59 

    60 

    61   /*

    62    *  Invert byte order within each 16-bits of an array.

    63    */

    64 

    65   FT_LOCAL_DEF( void )

    66   TwoByteSwap( unsigned char*  buf,

    67                size_t          nbytes )

    68   {

    69     unsigned char  c;

    70 

    71 

    72     for ( ; nbytes >= 2; nbytes -= 2, buf += 2 )

    73     {

    74       c      = buf[0];

    75       buf[0] = buf[1];

    76       buf[1] = c;

    77     }

    78   }

    79 

    80   /*

    81    *  Invert byte order within each 32-bits of an array.

    82    */

    83 

    84   FT_LOCAL_DEF( void )

    85   FourByteSwap( unsigned char*  buf,

    86                 size_t          nbytes )

    87   {

    88     unsigned char  c;

    89 

    90 

    91     for ( ; nbytes >= 4; nbytes -= 4, buf += 4 )

    92     {

    93       c      = buf[0];

    94       buf[0] = buf[3];

    95       buf[3] = c;

    96 

    97       c      = buf[1];

    98       buf[1] = buf[2];

    99       buf[2] = c;

   100     }

   101   }

   102 

   103 

   104 /* END */