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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 "pm_c_util.h"
#include "mallocvar.h"
#include "shhopt.h"
#include "ppm.h"
struct cmdlineInfo {
/* All the information the user supplied in the command line,
in a form easy for the program to use.
*/
const char * inputFileName; /* Name of input file */
unsigned int verbose;
};
static void
parseCommandLine(int argc, const char ** argv,
struct cmdlineInfo * const cmdlineP) {
optEntry * option_def;
/* Instructions to OptParseOptions3 on how to parse our options */
optStruct3 opt;
unsigned int option_def_index;
MALLOCARRAY_NOFAIL(option_def, 100);
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 */
pm_optParseOptions3(&argc, (char **)argv, opt, sizeof(opt), 0);
/* Uses and sets argc, argv, and some of *cmdlineP and others. */
if (argc-1 < 1)
cmdlineP->inputFileName = "-";
else {
cmdlineP->inputFileName = argv[1];
if (argc-1 > 1)
pm_error("Too many arguments: %u. The only possible argument "
"is the input file name", argc-1);
}
}
#define ESC "\x1B\x5B"
#define NUM_COLORS 128
#define MAX_ANSI_STR_LEN 16
static void
generatePalette(unsigned char rgb[NUM_COLORS][3],
char ansiCode[NUM_COLORS][MAX_ANSI_STR_LEN],
unsigned int * const paletteSizeP) {
/*----------------------------------------------------------------------------
Generate some sort of color palette mixing the available colors as different
values of background, foreground & brightness.
-----------------------------------------------------------------------------*/
unsigned int code;
unsigned int col;
unsigned int cd2;
memset((void *)rgb, 0, NUM_COLORS*3);
memset((void *)ansiCode, 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 & (0x1 << c)) != 0)
rgb[col][c] = (192 | (b ? 63 : 0));
if ((cd2 & (0x1 << c)) != 0)
rgb[col][c] |= 0x80;
}
sprintf(ansiCode[col],
ESC"%dm"ESC"3%dm"ESC"4%dm",
b, code, cd2);
++col;
}
}
}
*paletteSizeP = col;
}
int
main(int argc, const char ** argv) {
FILE * ifP;
pixel ** pixels;
int rows, cols;
unsigned int row;
unsigned int palLen;
pixval maxval;
struct cmdlineInfo cmdline;
unsigned char rgb[NUM_COLORS][3];
char ansiCode[NUM_COLORS][MAX_ANSI_STR_LEN];
pm_proginit(&argc, argv);
parseCommandLine(argc, argv, &cmdline);
ifP = pm_openr(cmdline.inputFileName);
pixels = ppm_readppm(ifP, &cols, &rows, &maxval);
pm_close(ifP);
generatePalette(rgb, ansiCode, &palLen);
for (row = 0; row < rows; ++row) {
unsigned int col;
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;
unsigned int i;
/* 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 < palLen; ++i) {
pixval const pr=rgb[i][0];
pixval const pg=rgb[i][1];
pixval const pb=rgb[i][2];
unsigned int const j = SQR(r-pr) + SQR(b-pb) + SQR(g-pg);
if (j < dist) {
dist = j;
val = i;
}
}
printf("%s%c", ansiCode[val], 0xB1);
}
printf(ESC"\x30m\n");
}
printf(ESC"\x30m");
ppm_freearray(pixels, rows);
return 0;
}
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