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added code to generate RLE tables.

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This commit is contained in:
Eric Smith 2003-02-19 10:34:35 +00:00
parent 0b0b2bca1e
commit 03e732c4b5
1 changed files with 66 additions and 4 deletions
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70
bitblt_table_gen.c
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@ -4,7 +4,7 @@
* will be compressed using ITU-T T.6 (G4) fax encoding.
*
* bitblt table generator
* $Id: bitblt_table_gen.c,v 1.1 2003/02/19 02:14:44 eric Exp $
* $Id: bitblt_table_gen.c,v 1.2 2003/02/19 02:34:35 eric Exp $
* Copyright 2001, 2002, 2003 Eric Smith <eric@brouhaha.com>
*
* This program is free software; you can redistribute it and/or modify
@ -26,12 +26,10 @@
#include <stdio.h>
int main (int argc, char *argv[])
void gen_bit_reverse_table (void)
{
int i, j;
printf ("/* This file is automatically generated; do not edit */\n");
printf ("\n");
printf ("static const uint8_t bit_reverse_byte [0x100] =\n");
printf ("{\n");
for (i = 0; i < 0x100; i++)
@ -55,5 +53,69 @@ int main (int argc, char *argv[])
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 (int val, char *name)
{
int i, j;
printf ("static const uint8_t %s [8][256] =\n", name);
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[])
{
printf ("/* This file is automatically generated; do not edit */\n");
printf ("\n");
gen_bit_reverse_table ();
printf ("\n");
gen_run_length_table (0, "white_rle_tab");
printf ("\n");
gen_run_length_table (1, "black_rle_tab");
printf ("\n");
return (0);
}