101 lines
2.3 KiB
C
101 lines
2.3 KiB
C
/*
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Copyright 1990, 1994, 1998 The Open Group
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All Rights Reserved.
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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Except as contained in this notice, the name of The Open Group shall not be
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used in advertising or otherwise to promote the sale, use or other dealings
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in this Software without prior written authorization from The Open Group.
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*/
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/* $XFree86: xc/lib/font/util/utilbitmap.c,v 1.3 1999/08/22 08:58:58 dawes Exp $ */
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/*
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* Author: Keith Packard, MIT X Consortium
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*/
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/* Modified for use with FreeType */
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#include <ft2build.h>
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#include "pcfutil.h"
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/*
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* Invert bit order within each BYTE of an array.
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*/
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FT_LOCAL_DEF( void )
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BitOrderInvert( unsigned char* buf,
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int nbytes )
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{
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for ( ; --nbytes >= 0; buf++ )
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{
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unsigned int val = *buf;
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val = ( ( val >> 1 ) & 0x55 ) | ( ( val << 1 ) & 0xAA );
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val = ( ( val >> 2 ) & 0x33 ) | ( ( val << 2 ) & 0xCC );
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val = ( ( val >> 4 ) & 0x0F ) | ( ( val << 4 ) & 0xF0 );
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*buf = (unsigned char)val;
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}
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}
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/*
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* Invert byte order within each 16-bits of an array.
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*/
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FT_LOCAL_DEF( void )
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TwoByteSwap( unsigned char* buf,
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int nbytes )
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{
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unsigned char c;
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for ( ; nbytes >= 2; nbytes -= 2, buf += 2 )
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{
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c = buf[0];
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buf[0] = buf[1];
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buf[1] = c;
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}
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}
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/*
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* Invert byte order within each 32-bits of an array.
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*/
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FT_LOCAL_DEF( void )
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FourByteSwap( unsigned char* buf,
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int nbytes )
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{
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unsigned char c;
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for ( ; nbytes >= 4; nbytes -= 4, buf += 4 )
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{
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c = buf[0];
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buf[0] = buf[3];
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buf[3] = c;
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c = buf[1];
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buf[1] = buf[2];
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buf[2] = c;
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}
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}
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/* END */
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