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/* pgmhist.c - print a histogram of the values in a PGM image
**
** Copyright (C) 1989 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.
*/
#include <assert.h>
#include <limits.h>
#include "pm_c_util.h"
#include "mallocvar.h"
#include "shhopt.h"
#include "pgm.h"
struct cmdline_info {
/* All the information the user supplied in the command line,
in a form easy for the program to use.
*/
const char * inputFileName; /* Filename of input files */
};
static void
parseCommandLine(int argc, const char ** argv,
struct cmdline_info * const cmdlineP) {
/*----------------------------------------------------------------------------
Note that the file spec array we return is stored in the storage that
was passed to us as the argv array.
-----------------------------------------------------------------------------*/
optStruct3 opt; /* set by OPTENT3 */
optEntry * option_def;
unsigned int option_def_index;
MALLOCARRAY(option_def, 100);
option_def_index = 0; /* incremented by OPTENTRY */
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 == 0)
cmdlineP->inputFileName = "-";
else if (argc-1 != 1)
pm_error("Program takes zero or one argument (filename). You "
"specified %d", argc-1);
else
cmdlineP->inputFileName = argv[1];
}
static void
buildHistogram(FILE * const ifP,
unsigned int ** const histP,
gray * const maxvalP) {
gray * grayrow;
int rows, cols;
int format;
unsigned int row;
unsigned int i;
unsigned int * hist; /* malloc'ed array */
gray maxval;
pgm_readpgminit(ifP, &cols, &rows, &maxval, &format);
if (UINT_MAX / cols < rows)
pm_error("Too many pixels (%u x %u) in image. "
"Maximum computable is %u",
cols, rows, UINT_MAX);
grayrow = pgm_allocrow(cols);
MALLOCARRAY(hist, maxval + 1);
if (hist == NULL)
pm_error("out of memory");
for (i = 0; i <= maxval; ++i)
hist[i] = 0;
for (row = 0; row < rows; ++row) {
unsigned int col;
pgm_readpgmrow(ifP, grayrow, cols, maxval, format);
for (col = 0; col < cols; ++col) {
/* Because total pixels in image is limited: */
assert (hist[grayrow[col]] < INT_MAX);
++hist[grayrow[col]];
}
}
pgm_freerow(grayrow);
*histP = hist;
*maxvalP = maxval;
}
static void
countCumulative(unsigned int const hist[],
gray const maxval,
unsigned int ** const rcountP) {
unsigned int * rcount;
unsigned int cumCount;
int i;
MALLOCARRAY(rcount, maxval + 1);
if (rcount == NULL)
pm_error("out of memory");
for (i = maxval, cumCount = 0; i >= 0; --i) {
/* Because total pixels in image is limited: */
assert(UINT_MAX - hist[i] >= cumCount);
cumCount += hist[i];
rcount[i] = cumCount;
}
*rcountP = rcount;
}
static void
report(unsigned int const hist[],
unsigned int const rcount[],
gray const maxval) {
unsigned int const totalPixels = rcount[0];
unsigned int count;
unsigned int i;
printf("value count b%% w%% \n");
printf("----- ----- ------ ------\n");
count = 0;
for (i = 0; i <= maxval; ++i) {
if (hist[i] > 0) {
count += hist[i];
printf(
"%5d %5d %5.3g%% %5.3g%%\n", i, hist[i],
(float) count * 100.0 / totalPixels,
(float) rcount[i] * 100.0 / totalPixels);
}
}
}
int
main(int argc, const char ** argv) {
struct cmdline_info cmdline;
FILE * ifP;
gray maxval;
unsigned int * rcount; /* malloc'ed array */
unsigned int * hist; /* malloc'ed array */
pm_proginit(&argc, argv);
parseCommandLine(argc, argv, &cmdline);
ifP = pm_openr(cmdline.inputFileName);
buildHistogram(ifP, &hist, &maxval);
countCumulative(hist, maxval, &rcount);
report(hist, rcount, maxval);
free(rcount);
free(hist);
pm_close(ifP);
return 0;
}
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