1/*
2
3Copyright 1990, 1994, 1998 The Open Group
4
5Permission to use, copy, modify, distribute, and sell this software and its
6documentation for any purpose is hereby granted without fee, provided that
7the above copyright notice appear in all copies and that both that
8copyright notice and this permission notice appear in supporting
9documentation.
10
11The above copyright notice and this permission notice shall be included in
12all copies or substantial portions of the Software.
13
14THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
17OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
18AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
19CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
20
21Except as contained in this notice, the name of The Open Group shall not be
22used in advertising or otherwise to promote the sale, use or other dealings
23in 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 */
120