/[freetype]/freetype2/src/pcf/pcfutil.c
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Diff of /freetype2/src/pcf/pcfutil.c

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revision 1.6 by werner, Sun Apr 25 20:15:09 2004 UTC revision 1.7 by freetype, Tue Mar 15 23:31:48 2005 UTC
# Line 32  in this Software without prior written a Line 32  in this Software without prior written a
32  #include "pcfutil.h"  #include "pcfutil.h"
33    
34    
   /* Utility functions for reformatting font bitmaps */  
   
   static const unsigned char  _reverse_byte[0x100] =  
   {  
     0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0,  
     0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0,  
     0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8,  
     0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8,  
     0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4,  
     0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4,  
     0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec,  
     0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc,  
     0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2,  
     0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2,  
     0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea,  
     0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa,  
     0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6,  
     0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6,  
     0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee,  
     0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe,  
     0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1,  
     0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1,  
     0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9,  
     0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9,  
     0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5,  
     0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5,  
     0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed,  
     0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd,  
     0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3,  
     0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3,  
     0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb,  
     0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb,  
     0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7,  
     0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7,  
     0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef,  
     0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff  
   };  
   
35    /*    /*
36     *  Invert bit order within each BYTE of an array.     *  Invert bit order within each BYTE of an array.
37     */     */
# Line 78  in this Software without prior written a Line 40  in this Software without prior written a
40    BitOrderInvert( unsigned char*  buf,    BitOrderInvert( unsigned char*  buf,
41                    int             nbytes )                    int             nbytes )
42    {    {
     const unsigned char*  rev = _reverse_byte;  
   
   
43      for ( ; --nbytes >= 0; buf++ )      for ( ; --nbytes >= 0; buf++ )
44        *buf = rev[*buf];      {
45          unsigned int  val = *buf;
46          
47          val = ((val >> 1) & 0x55) | ((val << 1) & 0xAA);
48          val = ((val >> 2) & 0x33) | ((val << 2) & 0xCC);
49          val = ((val >> 4) & 0x0F) | ((val << 4) & 0xF0);
50          
51          *buf = (unsigned char)val;
52        }
53    }    }
54    
55    
# Line 97  in this Software without prior written a Line 64  in this Software without prior written a
64      unsigned char  c;      unsigned char  c;
65    
66    
67      for ( ; nbytes > 0; nbytes -= 2, buf += 2 )      for ( ; nbytes >= 2; nbytes -= 2, buf += 2 )
68      {      {
69        c      = buf[0];        c      = buf[0];
70        buf[0] = buf[1];        buf[0] = buf[1];
# Line 116  in this Software without prior written a Line 83  in this Software without prior written a
83      unsigned char  c;      unsigned char  c;
84    
85    
86      for ( ; nbytes > 0; nbytes -= 4, buf += 4 )      for ( ; nbytes >= 4; nbytes -= 4, buf += 4 )
87      {      {
88        c      = buf[0];        c      = buf[0];
89        buf[0] = buf[3];        buf[0] = buf[3];

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