tumble: bitblt_table_gen.c@f2e13c2ff575 (annotated)

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bitblt_table_gen.c@f2e13c2ff575 (annotated)

bitblt_table_gen.c

Wed, 12 Mar 2003 06:39:22 +0000

author: eric
date: Wed, 12 Mar 2003 06:39:22 +0000
changeset 97: f2e13c2ff575
parent 78: 74b6b230f85d
child 98: 5fb9b9f7c2b8
permissions: -rw-r--r--

changed bitblt_table_gen.c to generate both a header and a C source file (bitblt_tables.[ch]).

 /*
  * t2p: Create a PDF file from the contents of one or more TIFF
  *      bilevel image files.  The images in the resulting PDF file
  *      will be compressed using ITU-T T.6 (G4) fax encoding.
  *
  * bitblt table generator
  * $Id: bitblt_table_gen.c,v 1.5 2003/03/11 22:39:22 eric Exp $
  * Copyright 2003 Eric Smith <eric@brouhaha.com>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.  Note that permission is
  * not granted to redistribute this program under the terms of any
  * other version of the General Public License.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111 USA
  */
 #include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>
 void gen_bit_reverse_table (bool header)
 {
   int i, j;
   if (header)
     printf ("extern ");
   printf ("const uint8_t bit_reverse_byte [0x100]");
   if (header)
     {
       printf (";\n");
       return;
     }
   printf (" =\n");
   printf ("{\n");
   for (i = 0; i < 0x100; i++)
     {
       if ((i & 7) == 0)
 	printf ("  ");
       j = (((i & 0x01) << 7) |
 	   ((i & 0x02) << 5) |
 	   ((i & 0x04) << 3) |
 	   ((i & 0x08) << 1) |
 	   ((i & 0x10) >> 1) |
 	   ((i & 0x20) >> 3) |
 	   ((i & 0x40) >> 5) |
 	   ((i & 0x80) >> 7));
       printf ("0x%02x", j);
       if (i != 0xff)
 	printf (",");
       if ((i & 7) == 7)
 	printf ("\n");
       else
 	printf (" ");
     }
   printf ("};\n");
 }
 int count_run (int byte, int start_bit, int desired_val)
 {
   int count = 0;
   int i;
   for (i = start_bit; i < 8; i++)
     {
       int bit = (byte >> i) & 1;
       if (bit == desired_val)
 	count++;
       else
 	break;
     }
   return (count);
 }
 void gen_run_length_table (bool header, int val, char *name)
 {
   int i, j;
   if (header)
     printf ("extern ");
   printf ("const uint8_t %s [8][256]", name);
   if (header)
     {
       printf (";\n");
       return;
     }
   printf (" =\n");
   printf ("{\n");
   for (i = 0; i < 8; i++)
     {
       printf ("  {\n");
       for (j = 0; j < 256; j++)
 	{
 	  if ((j & 15) == 0)
 	    printf ("  ");
 	  printf ("%d", count_run (j, i, val));
 	  if (j != 0xff)
 	    printf (",");
 	  if ((j & 15) == 15)
 	    printf ("\n");
 	  else
 	    printf (" ");
 	}
       printf ("  }");
       if (i != 7)
 	printf (",");
       printf ("\n");
     }
   printf ("};\n");
 }
 int main (int argc, char *argv[])
 {
   bool header;
   if (argc != 2)
     {
       fprintf (stderr, "wrong arg count\n");
       exit (2);
     }
   if (strcmp (argv [1], "-h") == 0)
     header = 1;
   else if (strcmp (argv [1], "-c") == 0)
     header = 0;
   else
     {
       fprintf (stderr, "wrong args\n");
       exit (2);
     }
   printf ("/* This file is automatically generated; do not edit */\n");
   printf ("\n");
   if (! header)
     {
       printf ("#include <stdint.h>\n");
       printf ("#include \"bitblt_tables.h\"\n");
       printf ("\n");
     }
   gen_bit_reverse_table (header);
   printf ("\n");
   gen_run_length_table (header, 0, "rle_tab");
   printf ("\n");
   return (0);
 }

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bitblt_table_gen.c@f2e13c2ff575 (annotated)

bitblt_table_gen.c