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/* pgmoil.c - read a PPM image and turn into an oil painting
**
** Copyright (C) 1990 by Wilson Bent (whb@hoh-2.att.com)
** Shamelessly butchered into a color version by Chris Sheppard
** 2001
**
** 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 <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "mallocvar.h"
#include "shhopt.h"
#include "pam.h"
struct CmdlineInfo {
/* All the information the user supplied in the command line,
in a form easy for the program to use.
*/
const char * inputFileNm;
unsigned int n;
};
static void
parseCommandLine(int argc, const char ** argv,
struct CmdlineInfo * 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;
unsigned int nSpec;
MALLOCARRAY_NOFAIL(option_def, 100);
option_def_index = 0; /* incremented by OPTENT3 */
OPTENT3(0, "n", OPT_UINT, &cmdlineP->n, &nSpec, 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. */
free(option_def);
if (!nSpec)
cmdlineP->n = 3;
if (argc-1 < 1)
cmdlineP->inputFileNm = "-";
else if (argc-1 == 1)
cmdlineP->inputFileNm = argv[1];
else
pm_error("You specified too many arguments (%u). The only "
"possible argument is the optional input file specification.",
argc-1);
}
static void
computeRowHist(struct pam const inpam,
tuple ** const tuples,
unsigned int const smearFactor,
unsigned int const plane,
unsigned int const row,
unsigned int const col,
sample * const hist) {
/*----------------------------------------------------------------------------
Compute hist[] - frequencies, in the neighborhood of row 'row', column
'col', in plane 'plane', of each sample value
-----------------------------------------------------------------------------*/
sample i;
int drow;
for (i = 0; i <= inpam.maxval; ++i)
hist[i] = 0;
for (drow = row - smearFactor; drow <= row + smearFactor; ++drow) {
if (drow >= 0 && drow < inpam.height) {
int dcol;
for (dcol = col - smearFactor;
dcol <= col + smearFactor;
++dcol) {
if (dcol >= 0 && dcol < inpam.width)
++hist[tuples[drow][dcol][plane]];
}
}
}
}
static sample
modalValue(sample * const hist,
sample const maxval) {
/*----------------------------------------------------------------------------
The sample value that occurs most often according to histogram hist[].
-----------------------------------------------------------------------------*/
sample modalval;
unsigned int maxfreq;
sample sampleval;
for (sampleval = 0, maxfreq = 0, modalval = 0;
sampleval <= maxval;
++sampleval) {
if (hist[sampleval] > maxfreq) {
maxfreq = hist[sampleval];
modalval = sampleval;
}
}
return modalval;
}
static void
convertRow(struct pam const inpam,
tuple ** const tuples,
tuple * const tuplerow,
unsigned int const row,
unsigned int const smearFactor,
sample * const hist) {
/*----------------------------------------------------------------------------
'hist' is a working buffer inpam.width wide.
-----------------------------------------------------------------------------*/
unsigned int plane;
for (plane = 0; plane < inpam.depth; plane++) {
unsigned int col;
for (col = 0; col < inpam.width; ++col) {
sample modalval;
/* The sample value that occurs most often in the neighborhood
of column 'col' of row 'row', in plane 'plane'.
*/
computeRowHist(inpam, tuples, smearFactor, plane, row, col, hist);
modalval = modalValue(hist, inpam.maxval);
tuplerow[col][plane] = modalval;
}
}
}
int
main(int argc, const char ** argv) {
struct pam inpam, outpam;
FILE * ifP;
tuple ** tuples; /* malloc'ed */
tuple * tuplerow; /* malloc'ed */
sample * hist; /* malloc'ed */
/* A buffer for the convertRow subroutine to use */
int row;
struct CmdlineInfo cmdline;
pm_proginit(&argc, argv);
parseCommandLine(argc, argv, &cmdline);
ifP = pm_openr(cmdline.inputFileNm);
tuples = pnm_readpam(ifP, &inpam, PAM_STRUCT_SIZE(tuple_type));
MALLOCARRAY(hist, inpam.maxval + 1);
if (hist == NULL)
pm_error("Unable to allocate memory for histogram.");
outpam = inpam; outpam.file = stdout;
pnm_writepaminit(&outpam);
tuplerow = pnm_allocpamrow(&inpam);
for (row = 0; row < inpam.height; ++row) {
convertRow(inpam, tuples, tuplerow, row, cmdline.n, hist);
pnm_writepamrow(&outpam, tuplerow);
}
pnm_freepamrow(tuplerow);
free(hist);
pnm_freepamarray(tuples, &inpam);
pm_close(ifP);
pm_close(stdout);
return 0;
}
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