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/* ppmtoterm.c - convert a portable pixmap into an ISO 6429 (ANSI) color ascii
** text.
**
** Copyright (C) 2002 by Ero Carrera (ecarrera@lightforge.com)
** Partially based on,
** ppmtoyuv.c by Marc Boucher,
** ppmtolj.c by Jonathan Melvin and
** ppmtogif.c 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.
**
** 14/Aug/2002: First version.
**
*/
#include <string.h>
#include "ppm.h"
#include "shhopt.h"
struct cmdlineInfo {
/* All the information the user supplied in the command line,
in a form easy for the program to use.
*/
const char *inputFilespec; /* Filespec of input file */
unsigned int verbose;
};
static void
parseCommandLine(int argc, char **argv,
struct cmdlineInfo *cmdlineP) {
optEntry *option_def = malloc(100*sizeof(optEntry));
/* Instructions to OptParseOptions3 on how to parse our options */
optStruct3 opt;
unsigned int option_def_index;
option_def_index = 0; /* incremented by OPTENTRY */
OPTENT3(0, "verbose", OPT_FLAG, NULL, &cmdlineP->verbose, 0);
opt.opt_table = option_def;
opt.short_allowed = FALSE; /* We have no short (old-fashioned) options */
opt.allowNegNum = FALSE; /* We have no parms that are negative numbers */
optParseOptions3(&argc, argv, opt, sizeof(opt), 0);
/* Uses and sets argc, argv, and some of *cmdlineP and others. */
switch (argc-1) {
case 0:
cmdlineP->inputFilespec = "-";
break;
case 1:
cmdlineP->inputFilespec = argv[1];
break;
case 2:
break;
}
}
#define ESC "\x1B\x5B"
#define NUM_COLORS 128
#define MAX_ANSI_STR_LEN 16
static int __inline__ sqr(const int x) {
return x*x;
}
/*
Generates some sort of color palette mixing the available
colors as different values of background, foreground & brightness.
*/
static int
generate_palette(unsigned char rgb[NUM_COLORS][3],
char ansi_code[NUM_COLORS][MAX_ANSI_STR_LEN]) {
int code, col=0, cd2=0;
memset((void *)rgb, 0, NUM_COLORS*3);
memset((void *)ansi_code, 0, NUM_COLORS*MAX_ANSI_STR_LEN);
for(col=cd2=0; cd2<8; cd2++) {
unsigned int b;
for(b=0;b<2;b++) {
for(code=0; code<8; code++) {
unsigned int c;
for(c=0;c<3;c++) {
if(code&(1<<c)) {
rgb[col][c]=(192|(b?63:0));
}
if(cd2&(1<<c)) {
rgb[col][c]|=(128);
}
}
sprintf(ansi_code[col],
ESC"%dm"ESC"3%dm"ESC"4%dm",
b, code, cd2);
col++;
}
}
}
return col;
}
int main(int argc, char **argv)
{
FILE *ifp;
pixel **pixels;
int rows, row, cols, col,
pal_len, i;
pixval maxval;
struct cmdlineInfo
cmdline;
unsigned char rgb[NUM_COLORS][3];
char ansi_code[NUM_COLORS][MAX_ANSI_STR_LEN];
ppm_init(&argc, argv);
parseCommandLine(argc, argv, &cmdline);
ifp = pm_openr(cmdline.inputFilespec);
pixels = ppm_readppm(ifp, &cols, &rows, &maxval);
pm_close(ifp);
pal_len=generate_palette(rgb, ansi_code);
for (row = 0; row < rows; ++row) {
for (col = 0; col < cols; col++) {
pixval const r=(int)PPM_GETR(pixels[row][col])*255/maxval;
pixval const g=(int)PPM_GETG(pixels[row][col])*255/maxval;
pixval const b=(int)PPM_GETB(pixels[row][col])*255/maxval;
int val, dist;
/*
The following loop calculates the index that
corresponds to the minimum color distance
between the given RGB values and the values
available in the palette.
*/
for(i=0, dist=sqr(255)*3, val=0; i<pal_len; i++) {
pixval const pr=rgb[i][0];
pixval const pg=rgb[i][1];
pixval const pb=rgb[i][2];
unsigned int j;
if( (j=sqr(r-pr)+sqr(b-pb)+sqr(g-pg))<dist ) {
dist=j;
val=i;
}
}
printf("%s%c", ansi_code[val],0xB1);
}
printf(ESC"\x30m\n");
}
printf(ESC"\x30m");
ppm_freearray(pixels, rows);
exit(0);
}
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