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/* ppmtosix.c - read a portable pixmap and produce a color sixel file
**
** Copyright (C) 1991 by Rick Vinci.
**
** 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 "ppm.h"
static void WriteHeader ARGS((void));
static void WriteColorMap
ARGS((colorhist_vector chv, int colors, pixval maxval));
static void WriteRawImage ARGS((colorhash_table cht, int rows, int cols));
static void WritePackedImage ARGS((colorhash_table cht, int rows, int cols));
static void WriteEnd ARGS((void));
#define MAXVAL 100
#define MAXCOLORS 256
#define DCS '\220' /* Device Control String */
#define ST '\234' /* String Terminator */
#define CSI '\233' /* Control String Introducer */
#define ESC '\033' /* Escape character */
static pixel** pixels; /* stored ppm pixmap input */
static colorhash_table cht;
int margin;
int
main( argc, argv )
int argc;
char* argv[];
{
FILE* ifp;
int argn, rows, cols, colors;
int raw;
pixval maxval;
colorhist_vector chv;
const char* const usage = "[-raw] [-margin] [ppmfile]";
ppm_init( &argc, argv );
argn = 1;
raw = 0;
margin = 0;
/* Parse args. */
while ( argn < argc && argv[argn][0] == '-' && argv[argn][1] != '\0' )
{
if ( pm_keymatch( argv[argn], "-raw", 2 ) )
raw = 1;
else if ( pm_keymatch( argv[argn], "-margin", 2 ) )
margin = 1;
else
pm_usage( usage );
++argn;
}
if ( argn < argc )
{
ifp = pm_openr( argv[argn] );
++argn;
}
else
ifp = stdin;
if ( argn != argc )
pm_usage( usage );
/* Read in the whole ppmfile. */
pixels = ppm_readppm( ifp, &cols, &rows, &maxval );
pm_close( ifp );
/* Print a warning if we could lose accuracy when rescaling colors. */
if ( maxval > MAXVAL )
pm_message(
"maxval is not %d - automatically rescaling colors", MAXVAL );
/* Figure out the colormap. */
pm_message( "computing colormap..." );
chv = ppm_computecolorhist( pixels, cols, rows, MAXCOLORS, &colors );
if ( chv == (colorhist_vector) 0 )
pm_error( "too many colors - try doing a 'pnmquant %d'", MAXCOLORS );
pm_message( "%d colors found", colors );
/* Make a hash table for fast color lookup. */
cht = ppm_colorhisttocolorhash( chv, colors );
WriteHeader();
WriteColorMap( chv, colors, maxval );
if ( raw == 1 )
WriteRawImage( cht, rows, cols );
else
WritePackedImage( cht, rows, cols );
WriteEnd();
/* If the program failed, it previously aborted with nonzero completion
code, via various function calls.
*/
return 0;
}
static void
WriteHeader()
{
if ( margin == 1 )
printf( "%c%d;%ds", CSI, 14, 72 );
printf( "%c", DCS ); /* start with Device Control String */
printf( "0;0;8q" ); /* Horizontal Grid Size at 1/90" and graphics On */
printf( "\"1;1\n" ); /* set aspect ratio 1:1 */
}
static void
WriteColorMap( colorhist_vector chv, int colors, pixval maxval )
{
register int colornum;
pixel p;
for ( colornum = 0; colornum < colors ; ++colornum )
{
p = chv[colornum].color;
if ( maxval != MAXVAL )
PPM_DEPTH( p, p, maxval, MAXVAL );
printf( "#%d;2;%d;%d;%d", colornum,
(int) PPM_GETR( p ), (int) PPM_GETG( p ), (int) PPM_GETB( p ) );
}
printf( "\n" );
}
static void
WriteRawImage( cht, rows, cols )
colorhash_table cht;
int rows, cols;
{
int rownum, colnum, b;
const char* sixel = "@ACGO_";
register pixel* pP;
for ( rownum = 0; rownum < rows; ++rownum )
{
b = rownum % 6;
for ( colnum = 0, pP = pixels[rownum]; colnum < cols; ++colnum, ++pP )
printf( "#%d%c", ppm_lookupcolor(cht, pP), sixel[b] );
printf( "$\n" ); /* Carriage Return */
if ( b == 5 )
printf( "-\n" ); /* Line Feed (one sixel height) */
}
}
static void
WritePackedImage( cht, rows, cols )
colorhash_table cht;
int rows, cols;
{
int rownum, colnum, b, repeat, thiscolor, nextcolor;
const char* sixel = "@ACGO_";
register pixel* pP;
for ( rownum = 0; rownum < rows; ++rownum )
{
b = rownum % 6;
repeat = 1;
for ( colnum = 0, pP = pixels[rownum]; colnum < cols; ++colnum, ++pP )
{
thiscolor = ppm_lookupcolor(cht, pP);
if ( colnum == cols -1 ) /* last pixel in row */
if ( repeat == 1 )
printf( "#%d%c", thiscolor, sixel[b] );
else
printf( "#%d!%d%c", thiscolor, repeat, sixel[b] );
else /* not last pixel in row */
{
nextcolor = ppm_lookupcolor(cht, pP+1);
if ( thiscolor == nextcolor )
++repeat;
else
if ( repeat == 1 )
printf( "#%d%c", thiscolor, sixel[b] );
else
{
printf( "#%d!%d%c", thiscolor, repeat, sixel[b] );
repeat = 1;
}
}
} /* end column loop */
printf( "$\n" ); /* Carriage Return */
if ( b == 5 )
printf( "-\n" ); /* Line Feed (one sixel height) */
}
}
static void
WriteEnd()
{
if ( margin == 1 )
printf ( "%c%d;%ds", CSI, 1, 80 );
printf( "%c\n", ST );
}
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