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/* pbmtoascii.c - read a portable bitmap and produce ASCII graphics
**
** Copyright (C) 1988, 1992 by Jef Poskanzer.
**
** Permission to use, copy, modify, and distribute this software and its
** documentation for any purpose and without fee is hereby granted, provided
** that the above copyright notice appear in all copies and that both that
** copyright notice and this permission notice appear in supporting
** documentation. This software is provided "as is" without express or
** implied warranty.
*/
#include "pbm.h"
#define SQQ '\''
#define BSQ '\\'
/* Bit-map for 1x2 mode:
** 1
** 2
*/
static char carr1x2[4] = {
/* 0 1 2 3 */
' ', '"', 'o', 'M' };
/* Bit-map for 2x4 mode (hex):
** 1 2
** 4 8
** 10 20
** 40 80
** The idea here is first to preserve geometry, then to show density.
*/
#define D08 'M'
#define D07 'H'
#define D06 '&'
#define D05 '$'
#define D04 '?'
static char carr2x4[256] = {
/*0 1 2 3 4 5 6 7 8 9 A B C D E F */
' ',SQQ, '`','"', '-',SQQ, SQQ,SQQ, '-','`', '`','`', '-','^', '^','"',/*00-0F*/
'.',':', ':',':', '|','|', '/',D04, '/','>', '/','>', '~','+', '/','*',/*10-1F*/
'.',':', ':',':', BSQ,BSQ, '<','<', '|',BSQ, '|',D04, '~',BSQ, '+','*',/*20-2F*/
'-',':', ':',':', '~',D04, '<','<', '~','>', D04,'>', '=','b', 'd','#',/*30-3F*/
'.',':', ':',':', ':','!', '/',D04, ':',':', '/',D04, ':',D04, D04,'P',/*40-4F*/
',','i', '/',D04, '|','|', '|','T', '/',D04, '/','7', 'r','}', '/','P',/*50-5F*/
',',':', ';',D04, '>',D04, 'S','S', '/',')', '|','7', '>',D05, D05,D06,/*60-6F*/
'v',D04, D04,D05, '+','}', D05,'F', '/',D05, '/',D06, 'p','D', D06,D07,/*70-7F*/
'.',':', ':',':', ':',BSQ, ':',D04, ':',BSQ, '!',D04, ':',D04, D04,D05,/*80-8F*/
BSQ,BSQ, ':',D04, BSQ,'|', '(',D05, '<','%', D04,'Z', '<',D05, D05,D06,/*90-9F*/
',',BSQ, 'i',D04, BSQ,BSQ, D04,BSQ, '|','|', '|','T', D04,BSQ, '4','9',/*A0-AF*/
'v',D04, D04,D05, BSQ,BSQ, D05,D06, '+',D05, '{',D06, 'q',D06, D06,D07,/*B0-BF*/
'_',':', ':',D04, ':',D04, D04,D05, ':',D04, D04,D05, ':',D05, D05,D06,/*C0-CF*/
BSQ,D04, D04,D05, D04,'L', D05,'[', '<','Z', '/','Z', 'c','k', D06,'R',/*D0-DF*/
',',D04, D04,D05, '>',BSQ, 'S','S', D04,D05, 'J',']', '>',D06, '1','9',/*E0-EF*/
'o','b', 'd',D06, 'b','b', D06,'6', 'd',D06, 'd',D07, '#',D07, D07,D08 /*F0-FF*/
};
int
main( argc, argv )
int argc;
char* argv[];
{
FILE* ifp;
int argn, gridx, gridy, rows, cols, format;
int ccols, lastcol, row, subrow, subcol;
register int col, b;
bit* bitrow;
register bit* bP;
int* sig;
register int* sP;
char* line;
register char* lP;
char* carr;
const char* usage = "[-1x2|-2x4] [pbmfile]";
pbm_init( &argc, argv );
/* Set up default parameters. */
argn = 1;
gridx = 1;
gridy = 2;
carr = carr1x2;
/* Check for flags. */
while ( argn < argc && argv[argn][0] == '-' && argv[argn][1] != '\0' )
{
if ( pm_keymatch( argv[argn], "-1x2", 2 ) )
{
gridx = 1;
gridy = 2;
carr = carr1x2;
}
else if ( pm_keymatch( argv[argn], "-2x4", 2 ) )
{
gridx = 2;
gridy = 4;
carr = carr2x4;
}
else
pm_usage( usage );
++argn;
}
if ( argn < argc )
{
ifp = pm_openr( argv[argn] );
++argn;
}
else
ifp = stdin;
if ( argn != argc )
pm_usage( usage );
pbm_readpbminit( ifp, &cols, &rows, &format );
ccols = ( cols + gridx - 1 ) / gridx;
bitrow = pbm_allocrow( cols );
sig = (int*) pm_allocrow( ccols, sizeof(int) );
line = (char*) pm_allocrow( ccols + 1, sizeof(char) );
for ( row = 0; row < rows; row += gridy )
{
/* Get a character-row's worth of sigs. */
for ( col = 0; col < ccols; ++col )
sig[col] = 0;
b = 1;
for ( subrow = 0; subrow < gridy; ++subrow )
{
if ( row + subrow < rows )
{
pbm_readpbmrow( ifp, bitrow, cols, format );
for ( subcol = 0; subcol < gridx; ++subcol )
{
for ( col = subcol, bP = &(bitrow[subcol]), sP = sig;
col < cols;
col += gridx, bP += gridx, ++sP )
if ( *bP == PBM_BLACK )
*sP |= b;
b <<= 1;
}
}
}
/* Ok, now remove trailing blanks. */
for ( lastcol = ccols - 1; lastcol >= 0; --lastcol )
if ( carr[sig[lastcol]] != ' ' )
break;
/* Copy chars to an array and print. */
for ( col = 0, sP = sig, lP = line; col <= lastcol; ++col, ++sP, ++lP )
*lP = carr[*sP];
*lP++ = '\0';
puts( line );
}
pm_close( ifp );
pbm_freerow( bitrow );
pm_freerow( (char*) sig );
pm_freerow( (char*) line );
/* If the program failed, it previously aborted with nonzero completion
code, via various function calls.
*/
return 0;
}
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