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 ) BitOrderInvert(unsigned char * buf,size_t nbytes)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 /* 61 * Invert byte order within each 16-bits of an array. 62 */ 63 64 FT_LOCAL_DEF( void ) TwoByteSwap(unsigned char * buf,size_t nbytes)65 TwoByteSwap( unsigned char* buf, 66 size_t nbytes ) 67 { 68 for ( ; nbytes >= 2; nbytes -= 2, buf += 2 ) 69 { 70 unsigned char c; 71 72 73 c = buf[0]; 74 buf[0] = buf[1]; 75 buf[1] = c; 76 } 77 } 78 79 /* 80 * Invert byte order within each 32-bits of an array. 81 */ 82 83 FT_LOCAL_DEF( void ) FourByteSwap(unsigned char * buf,size_t nbytes)84 FourByteSwap( unsigned char* buf, 85 size_t nbytes ) 86 { 87 for ( ; nbytes >= 4; nbytes -= 4, buf += 4 ) 88 { 89 unsigned char c; 90 91 92 c = buf[0]; 93 buf[0] = buf[3]; 94 buf[3] = c; 95 96 c = buf[1]; 97 buf[1] = buf[2]; 98 buf[2] = c; 99 } 100 } 101 102 103 /* END */ 104