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/*=========================================================================
ppmcolormask
===========================================================================
This program produces a PBM mask of areas containing a certain color.
By Bryan Henderson, Olympia WA; April 2000.
Contributed to the public domain by its author.
=========================================================================*/
#define _BSD_SOURCE /* Make sure strdup() is in <string.h> */
#include <assert.h>
#include <string.h>
#include "pm_c_util.h"
#include "shhopt.h"
#include "mallocvar.h"
#include "nstring.h"
#include "ppm.h"
#include "pbm.h"
enum matchType {
MATCH_EXACT,
MATCH_BK
};
struct cmdlineInfo {
/* All the information the user supplied in the command line,
in a form easy for the program to use.
*/
const char * inputFilename;
unsigned int colorCount;
struct {
enum matchType matchType;
union {
pixel color; /* matchType == MATCH_EXACT */
bk_color bkColor; /* matchType == MATCH_BK */
} u;
} maskColor[16];
unsigned int verbose;
};
static void
parseColorOpt(const char * const colorOpt,
struct cmdlineInfo * const cmdlineP) {
unsigned int colorCount;
char * colorOptWork;
char * cursor;
bool eol;
colorOptWork = strdup(colorOpt);
cursor = &colorOptWork[0];
eol = FALSE; /* initial value */
colorCount = 0; /* initial value */
while (!eol && colorCount < ARRAY_SIZE(cmdlineP->maskColor)) {
const char * token;
token = strsepN(&cursor, ",");
if (token) {
if (strneq(token, "bk:", 3)) {
cmdlineP->maskColor[colorCount].matchType = MATCH_BK;
cmdlineP->maskColor[colorCount].u.bkColor =
ppm_bk_color_from_name(&token[3]);
} else {
cmdlineP->maskColor[colorCount].matchType = MATCH_EXACT;
cmdlineP->maskColor[colorCount].u.color =
ppm_parsecolor(token, PPM_MAXMAXVAL);
}
++colorCount;
} else
eol = TRUE;
}
free(colorOptWork);
cmdlineP->colorCount = colorCount;
}
static void
parseCommandLine(int argc, char ** argv,
struct cmdlineInfo *cmdlineP) {
/*----------------------------------------------------------------------------
Note that many of the strings that this function returns in the
*cmdlineP structure are actually in the supplied argv array. And
sometimes, one of these strings is actually just a suffix of an entry
in argv!
-----------------------------------------------------------------------------*/
optEntry * option_def;
/* Instructions to OptParseOptions3 on how to parse our options. */
optStruct3 opt;
unsigned int option_def_index;
const char * colorOpt;
unsigned int colorSpec;
MALLOCARRAY_NOFAIL(option_def, 100);
option_def_index = 0; /* incremented by OPTENT3 */
OPTENT3(0, "color", OPT_STRING, &colorOpt, &colorSpec, 0);
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 may have parms that are negative numbers */
optParseOptions3(&argc, argv, opt, sizeof(opt), 0);
/* Uses and sets argc, argv, and all of *cmdlineP. */
if (colorSpec)
parseColorOpt(colorOpt, cmdlineP);
if (colorSpec) {
if (argc-1 < 1)
cmdlineP->inputFilename = "-"; /* he wants stdin */
else if (argc-1 == 1)
cmdlineP->inputFilename = argv[1];
else
pm_error("Too many arguments. When you specify -color, "
"the only argument accepted is the optional input "
"file name.");
} else {
if (argc-1 < 1)
pm_error("You must specify the -color option.");
else {
cmdlineP->colorCount = 1;
cmdlineP->maskColor[0].matchType = MATCH_EXACT;
cmdlineP->maskColor[0].u.color =
ppm_parsecolor(argv[1], PPM_MAXMAXVAL);
if (argc - 1 < 2)
cmdlineP->inputFilename = "-"; /* he wants stdin */
else if (argc-1 == 2)
cmdlineP->inputFilename = argv[2];
else
pm_error("Too many arguments. The only arguments accepted "
"are the mask color and optional input file name");
}
}
}
static bool
isBkColor(pixel const comparator,
pixval const maxval,
bk_color const comparand) {
/* TODO: keep a cache of the bk color for each color in
a colorhash_table.
*/
bk_color const comparatorBk = ppm_bk_color_from_color(comparator, maxval);
return comparatorBk == comparand;
}
static bool
colorIsInSet(pixel const color,
pixval const maxval,
struct cmdlineInfo const cmdline) {
bool isInSet;
unsigned int i;
for (i = 0, isInSet = FALSE;
i < cmdline.colorCount && !isInSet; ++i) {
assert(i < ARRAY_SIZE(cmdline.maskColor));
switch(cmdline.maskColor[i].matchType) {
case MATCH_EXACT:
if (PPM_EQUAL(color, cmdline.maskColor[i].u.color))
isInSet = TRUE;
break;
case MATCH_BK:
if (isBkColor(color, maxval, cmdline.maskColor[i].u.bkColor))
isInSet = TRUE;
break;
}
}
return isInSet;
}
int
main(int argc, char *argv[]) {
struct cmdlineInfo cmdline;
FILE * ifP;
/* Parameters of input image: */
int rows, cols;
pixval maxval;
int format;
ppm_init(&argc, argv);
parseCommandLine(argc, argv, &cmdline);
ifP = pm_openr(cmdline.inputFilename);
ppm_readppminit(ifP, &cols, &rows, &maxval, &format);
pbm_writepbminit(stdout, cols, rows, 0);
{
pixel * const inputRow = ppm_allocrow(cols);
bit * const maskRow = pbm_allocrow(cols);
unsigned int numPixelsMasked;
unsigned int row;
for (row = 0, numPixelsMasked = 0; row < rows; ++row) {
int col;
ppm_readppmrow(ifP, inputRow, cols, maxval, format);
for (col = 0; col < cols; ++col) {
if (colorIsInSet(inputRow[col], maxval, cmdline)) {
maskRow[col] = PBM_BLACK;
++numPixelsMasked;
} else
maskRow[col] = PBM_WHITE;
}
pbm_writepbmrow(stdout, maskRow, cols, 0);
}
if (cmdline.verbose)
pm_message("%u pixels found matching %u requested colors",
numPixelsMasked, cmdline.colorCount);
pbm_freerow(maskRow);
ppm_freerow(inputRow);
}
pm_close(ifP);
return 0;
}
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