172 lines
3.4 KiB
C
172 lines
3.4 KiB
C
/*
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* tumble: build a PDF file from image files
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*
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* bitblt table generator
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* Copyright 2003, 2017 Eric Smith <spacewar@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation. Note that permission is
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* not granted to redistribute this program under the terms of any
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* other version of the General Public License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111 USA
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*/
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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void gen_bit_reverse_table (bool header)
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{
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int i, j;
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if (header)
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printf ("extern ");
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printf ("const uint8_t bit_reverse_byte [0x100]");
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if (header)
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{
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printf (";\n");
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return;
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}
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printf (" =\n");
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printf ("{\n");
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for (i = 0; i < 0x100; i++)
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{
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if ((i & 7) == 0)
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printf (" ");
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j = (((i & 0x01) << 7) |
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((i & 0x02) << 5) |
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((i & 0x04) << 3) |
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((i & 0x08) << 1) |
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((i & 0x10) >> 1) |
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((i & 0x20) >> 3) |
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((i & 0x40) >> 5) |
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((i & 0x80) >> 7));
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printf ("0x%02x", j);
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if (i != 0xff)
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printf (",");
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if ((i & 7) == 7)
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printf ("\n");
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else
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printf (" ");
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}
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printf ("};\n");
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}
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int count_run (int byte, int start_bit, int desired_val)
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{
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int count = 0;
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int i;
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#ifdef WORDS_BIGENDIAN
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for (i = 7 - start_bit; i >= 0; i--)
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{
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int bit = (byte >> i) & 1;
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if (bit == desired_val)
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count++;
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else
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break;
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}
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#else
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for (i = start_bit; i < 8; i++)
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{
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int bit = (byte >> i) & 1;
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if (bit == desired_val)
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count++;
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else
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break;
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}
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#endif
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return (count);
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}
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void gen_run_length_table (bool header, int val, char *name)
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{
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int i, j;
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if (header)
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printf ("extern ");
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printf ("const uint8_t %s [8][256]", name);
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if (header)
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{
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printf (";\n");
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return;
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}
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printf (" =\n");
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printf ("{\n");
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for (i = 0; i < 8; i++)
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{
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printf (" {\n");
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for (j = 0; j < 256; j++)
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{
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if ((j & 15) == 0)
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printf (" ");
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printf ("%d", count_run (j, i, val));
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if (j != 0xff)
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printf (",");
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if ((j & 15) == 15)
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printf ("\n");
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else
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printf (" ");
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}
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printf (" }");
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if (i != 7)
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printf (",");
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printf ("\n");
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}
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printf ("};\n");
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}
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int main (int argc, char *argv[])
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{
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bool header;
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if (argc != 2)
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{
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fprintf (stderr, "wrong arg count\n");
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exit (2);
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}
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if (strcmp (argv [1], "-h") == 0)
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header = 1;
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else if (strcmp (argv [1], "-c") == 0)
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header = 0;
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else
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{
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fprintf (stderr, "wrong args\n");
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exit (2);
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}
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printf ("/* This file is automatically generated; do not edit */\n");
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printf ("\n");
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if (! header)
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{
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printf ("#include <stdint.h>\n");
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printf ("#include \"bitblt_tables.h\"\n");
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printf ("\n");
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}
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gen_bit_reverse_table (header);
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printf ("\n");
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gen_run_length_table (header, 0, "rle_tab");
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printf ("\n");
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return (0);
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}
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