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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 */
-