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PPMTOXPM.C
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1994-08-19
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/* ppmtoxpm.c - read a portable pixmap and produce a X11 pixmap
**
** Copyright (C) 1990 by Mark W. Snitily
**
** 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.
**
** This tool was developed for Schlumberger Technologies, ATE Division, and
** with their permission is being made available to the public with the above
** copyright notice and permission notice.
**
*/
#include <stdio.h>
#include <ctype.h>
#include "ppm.h"
#include "ppmcmap.h"
#ifdef SYSV
#include <string.h>
#define index strchr
#else /*SYSV*/
#include <strings.h>
#endif /*SYSV*/
/* Max number of colors allowed in ppm input. */
#define MAXCOLORS 256
/* Max number of rgb mnemonics allowed in rgb text file. */
#define MAX_RGBNAMES 1024
/* Lower bound and upper bound of character-pixels printed in XPM output.
Be careful, don't want the character '"' in this range. */
/*#define LOW_CHAR '#' <-- minimum ascii character allowed */
/*#define HIGH_CHAR '~' <-- maximum ascii character allowed */
#define LOW_CHAR '`'
#define HIGH_CHAR 'z'
#define max(a,b) ((a) > (b) ? (a) : (b))
void read_rgb_names(); /* forward reference */
void gen_cmap(); /* forward reference */
typedef struct { /* rgb values and ascii names (from rgb text file) */
int r, g, b; /* rgb values, range of 0 -> 65535 */
char *name; /* color mnemonic of rgb value */
} rgb_names;
typedef struct { /* character-pixel mapping */
char *cixel; /* character string printed for pixel */
char *rgbname; /* ascii rgb color, either color mnemonic or #rgb value */
} cixel_map;
pixel **pixels;
main(argc, argv)
int argc;
char *argv[];
{
FILE *ifd;
register pixel *pP;
int argn, rows, cols, ncolors, row, col, i;
pixval maxval; /* pixval == unsigned char or unsigned short */
colorhash_table cht;
colorhist_vector chv;
/* Used for rgb value -> rgb mnemonic mapping */
int map_rgb_names = 0;
rgb_names rgbn[MAX_RGBNAMES];
int rgbn_max;
/* Used for rgb value -> character-pixel string mapping */
cixel_map cmap[MAXCOLORS];
int charspp; /* chars per pixel */
char out_name[100], rgb_fname[100], *cp;
char *usage = "[-name <xpm-name>] [-rgb <rgb-textfile>] [ppmfile]";
pm_progname = argv[0];
out_name[0] = rgb_fname[0] = '\0';
argn = 1;
/* Check for command line options. */
while (argn < argc && argv[argn][0] == '-') {
/* Case "-", use stdin for input. */
if (argv[argn][1] == '\0') break;
/* Case "-name <xpm-filename>", get output filename. */
if (strncmp(argv[argn], "-name", max(strlen(argv[argn]),2)) == 0) {
argn++;
if (argn == argc || sscanf(argv[argn], "%s", out_name) != 1)
pm_usage(usage);
}
/* Case "-rgb <rgb-filename>", get rgb mnemonics filename. */
else if (strncmp(argv[argn], "-rgb", max(strlen(argv[argn]),2)) == 0) {
argn++;
if (argn == argc || sscanf(argv[argn], "%s", rgb_fname) != 1)
pm_usage(usage);
map_rgb_names = 1;
}
/* Nothing else allowed... */
else
pm_usage(usage);
argn++;
}
/* Input file specified, open it and set output filename if necessary. */
if (argn < argc) {
/* Open the input file. */
ifd = pm_openr(argv[argn]);
/* If output filename not specified, use input filename as default. */
if (out_name[0] == '\0') {
strcpy(out_name, argv[argn]);
if (cp = index(out_name, '.')) *cp = '\0'; /* remove extension */
}
/* If (1) input file was specified as "-" we're using stdin, or
(2) output filename was specified as "-",
set output filename to the default. */
if (!strcmp(out_name, "-" )) strcpy(out_name, "noname");
argn++;
}
/* No input file specified. Using stdin so set default output filename. */
else {
ifd = stdin;
if (out_name[0] == '\0') strcpy(out_name, "noname");
}
/* Only 0 or 1 input files allowed. */
if (argn != argc) pm_usage(usage);
/* "maxval" is the largest value that can be be found in the ppm file.
All pixel components are relative to this value. */
pixels = ppm_readppm(ifd, &cols, &rows, &maxval);
pm_close(ifd);
/* Figure out the colormap. */
fprintf(stderr, "(Computing colormap..."); fflush(stderr);
chv = ppm_computecolorhist(pixels, cols, rows, MAXCOLORS, &ncolors);
if (chv == (colorhist_vector) 0)
pm_error(
"too many colors - try running the pixmap through 'ppmquant 256'",
0, 0, 0, 0, 0);
fprintf(stderr, " Done. %d colors found.)\n", ncolors);
/* Make a hash table for fast color lookup. */
cht = ppm_colorhisttocolorhash(chv, ncolors);
/* If a rgb text file was specified, read in the rgb mnemonics.
Does not return if fatal error occurs. */
if (map_rgb_names) read_rgb_names(rgb_fname, rgbn, &rgbn_max);
/* Now generate the character-pixel colormap table. */
gen_cmap(chv, ncolors, maxval, map_rgb_names, rgbn, rgbn_max,
cmap, &charspp);
/* Write out the XPM header. */
printf("#define %s_format %d\n", out_name, 1);
printf("#define %s_width %d\n", out_name, cols);
printf("#define %s_height %d\n", out_name, rows);
printf("#define %s_ncolors %d\n", out_name, ncolors);
printf("#define %s_chars_per_pixel %d\n", out_name, charspp);
/* Write out the ascii colormap. */
printf("static char *%s_colors[] = {\n", out_name);
for (i=0; i<ncolors; i++) {
printf(" \"%s\", \"%s\"", cmap[i].cixel, cmap[i].rgbname);
if (i != (ncolors - 1)) printf(",\n");
else printf("\n");
}
printf("};\n");
/* Write out the ascii character-pixel image. */
printf("static char *%s_pixels[] = {\n", out_name);
for (row=0; row<rows; row++) {
printf("\"");
for (col=0, pP=pixels[row]; col<cols; col++, pP++)
printf("%s", cmap[ppm_lookupcolor(cht, *pP)].cixel);
if (row != (rows - 1)) printf("\",\n");
else printf("\"\n");
}
printf("};\n");
exit(0);
} /* main */
/*---------------------------------------------------------------------------*/
/* This routine reads a rgb text file. It stores the rgb values (0->65535)
and the rgb mnemonics (malloc'ed) into the "rgbn" array. Returns the
number of entries stored in "rgbn_max". */
void read_rgb_names(rgb_fname, rgbn, rgbn_max)
char *rgb_fname;
rgb_names rgbn[MAX_RGBNAMES];
int *rgbn_max;
{
FILE *rgbf;
int i, items, red, green, blue;
char line[512], name[512], *rgbname, *n, *m;
/* Open the rgb text file. Abort if error. */
if ((rgbf = fopen(rgb_fname, "r")) == NULL)
pm_error("error opening rgb text file \"%s\"", rgb_fname, 0, 0, 0, 0);
/* Loop reading each line in the file. */
for (i=0; fgets(line, sizeof(line), rgbf); i++) {
/* Quit if rgb text file is too large. */
if (i == MAX_RGBNAMES) {
fprintf(stderr,
"Too many entries in rgb text file, truncated to %d entries.\n",
MAX_RGBNAMES);
fflush(stderr);
break;
}
/* Read the line. Skip if bad. */
items = sscanf(line, "%d %d %d %[^\n]\n", &red, &green, &blue, name);
if (items != 4) {
fprintf(stderr, "rgb text file syntax error on line %d\n", i+1);
fflush(stderr);
i--;
continue;
}
/* Make sure rgb values are within 0->255 range. Skip if bad. */
if (red < 0 || red > 0xFF ||
green < 0 || green > 0xFF ||
blue < 0 || blue > 0xFF) {
fprintf(stderr, "rgb value for \"%s\" out of range, ignoring it\n",
name);
fflush(stderr);
i--;
continue;
}
/* Allocate memory for ascii name. Abort if error. */
if (!(rgbname = (char *) malloc(strlen(name)+1)))
pm_error("out of memory allocating rgb name", 0, 0, 0, 0, 0);
/* Copy string to ascii name and lowercase it. */
for (n=name, m=rgbname; *n; n++)
*m++ = isupper(*n) ? tolower(*n) : *n;
*m = '\0';
/* Save the rgb values and ascii name in the array. */
rgbn[i].r = red << 8;
rgbn[i].g = green << 8;
rgbn[i].b = blue << 8;
rgbn[i].name = rgbname;
}
/* Return the max number of rgb names. */
*rgbn_max = i-1;
fclose(rgbf);
} /* read_rgb_names */
/*---------------------------------------------------------------------------*/
/* Given a number and a base, (base == HIGH_CHAR-LOW_CHAR+1), this routine
prints the number into a malloc'ed string and returns it. The length of
the string is specified by "digits". The ascii characters of the printed
number range from LOW_CHAR to HIGH_CHAR. The string is LOW_CHAR filled,
(e.g. if LOW_CHAR==0, HIGH_CHAR==1, digits==5, i=3, routine would return
the malloc'ed string "00011"). */
char *gen_numstr(i, base, digits)
int i, base, digits;
{
char *str, *p;
int d;
/* Allocate memory for printed number. Abort if error. */
if (!(str = (char *) malloc(digits+1)))
pm_error("out of memory", 0, 0, 0, 0, 0);
/* Generate characters starting with least significant digit. */
p = str + digits;
*p-- = '\0'; /* nul terminate string */
while (p >= str) {
d = i % base;
i /= base;
*p-- = (char) ((int) LOW_CHAR + d);
}
return str;
} /* gen_numstr */
/*---------------------------------------------------------------------------*/
/* This routine generates the character-pixel colormap table. */
void gen_cmap(chv, ncolors, maxval, map_rgb_names, rgbn, rgbn_max,
cmap, charspp)
/* input: */
colorhist_vector chv; /* contains rgb values for colormap */
int ncolors; /* number of entries in colormap */
pixval maxval; /* largest color value, all rgb values relative
to this, (pixval == unsigned short) */
int map_rgb_names; /* == 1 if mapping rgb values to rgb mnemonics */
rgb_names rgbn[MAX_RGBNAMES]; /* rgb mnemonics from rgb text file */
int rgbn_max; /* number of rgb mnemonics in table */
/* output: */
cixel_map cmap[MAXCOLORS]; /* pixel strings and ascii rgb colors */
int *charspp; /* characters per pixel */
{
int i, j, base, cpp, mval, red, green, blue, r, g, b, matched;
char *str;
/* Figure out how many characters per pixel we'll be using. Don't want
to be forced to link with libm.a, so using a division loop rather than
a log function. */
base = (int) HIGH_CHAR - (int) LOW_CHAR + 1;
for (cpp=0, j=ncolors; j; cpp++) j /= base;
*charspp = cpp;
/* Determine how many hex digits we'll be normalizing to if the rgb value
doesn't match a color mnemonic. */
mval = (int) maxval;
if (mval <= 0x000F) mval = 0x000F;
else if (mval <= 0x00FF) mval = 0x00FF;
else if (mval <= 0x0FFF) mval = 0x0FFF;
else mval = 0xFFFF;
/* Generate the character-pixel string and the rgb name for each colormap
entry. */
for (i=0; i<ncolors; i++) {
/* The character-pixel string is simply a printed number in base "base"
where the digits of the number range from LOW_CHAR to HIGH_CHAR and
the printed length of the number is "cpp". */
cmap[i].cixel = gen_numstr(i, base, cpp);
/* Fetch the rgb value of the current colormap entry. */
red = PPM_GETR(chv[i].color);
green = PPM_GETG(chv[i].color);
blue = PPM_GETB(chv[i].color);
/* If the ppm color components are not relative to 15, 255, 4095, 65535,
normalize the color components here. */
if (mval != (int) maxval) {
red = (red * mval) / (int) maxval;
green = (green * mval) / (int) maxval;
blue = (blue * mval) / (int) maxval;
}
/* If the "-rgb <rgbfile>" option was specified, attempt to map the
rgb value to a color mnemonic. */
if (map_rgb_names) {
/* The rgb values of the color mnemonics are normalized relative
to 255 << 8, (i.e. 0xFF00). [That's how the original MIT code
did it, really should have been "v * 65535 / 255" instead of
"v << 8", but have to use the same scheme here or else colors
won't match...] So, if our rgb values aren't already 16-bit
values, need to shift left. */
if (mval==0x000F) { r=red << 12; g=green << 12; b=blue << 12;
/* Special case hack for "white". */
if (0xF000 == r && r == g && g == b)
r = g = b = 0xFF00;
}
else if (mval==0x00FF) { r=red << 8; g=green << 8; b=blue << 8;}
else if (mval==0x0FFF) { r=red << 4; g=green << 4; b=blue << 4;}
else { r=red; g=green; b=blue; }
/* Just perform a dumb linear search over the rgb values of the color
mnemonics. One could speed things up by sorting the rgb values
and using a binary search, or building a hash table, etc... */
for (matched = 0, j=0; j <= rgbn_max; j++)
if (r == rgbn[j].r && g == rgbn[j].g && b == rgbn[j].b) {
/* Matched. Allocate string, copy mnemonic, and exit. */
if (!(str = (char *) malloc(strlen(rgbn[i].name)+1)))
pm_error("out of memory", 0, 0, 0, 0, 0);
strcpy(str, rgbn[j].name);
cmap[i].rgbname = str;
matched = 1;
break;
}
if (matched) continue;
}
/* Either not mapping to color mnemonics, or didn't find a match.
Generate an absolute #RGB value string instead. */
if (!(str = (char *) malloc(mval == 0x000F ? 5 :
mval == 0x00FF ? 8 :
mval == 0x0FFF ? 11 :
14)))
pm_error("out of memory", 0, 0, 0, 0, 0);
sprintf(str, mval == 0x000F ? "#%X%X%X" :
mval == 0x00FF ? "#%02X%02X%02X" :
mval == 0x0FFF ? "#%03X%03X%03X" :
"#%04X%04X%04X", red, green, blue);
cmap[i].rgbname = str;
}
} /* gen_cmap */