pcfutil.c (3382B)
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_major__ ) && __clang_major__ >= 5 ) || \ 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 */