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/* ppmtorgb3.c - separate a PPM image into 3 PGM images.
**
** Copyright (C) 1991 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 <string.h>
#include "pm_c_util.h"
#include "mallocvar.h"
#include "nstring.h"
#include "ppm.h"
#include "pgm.h"
struct Cmdline {
const char * inputFileName;
};
static const char *
strippedOfExtension(const char * const arg) {
char * buffer;
MALLOCARRAY(buffer, strlen(arg) + 1);
strcpy(buffer, arg);
{
char * const dotPos = strrchr(buffer, '.');
if (dotPos)
*dotPos = '\0';
}
return buffer;
}
static void
openComponentOut(const char * const suffix,
const char * const baseName,
FILE ** const fpP) {
const char * fileName;
pm_asprintf(&fileName, "%s.%s", baseName, suffix);
*fpP = pm_openw(fileName);
pm_strfree(fileName);
}
int
main(int argc, const char ** argv) {
FILE * ifP;
FILE * redfP;
FILE * grnfP;
FILE * blufP;
pixel * pixelrow;
gray * grayrow;
int rows, cols;
int format;
unsigned int row;
pixval maxval;
struct Cmdline cmdline;
const char * baseFileName;
pm_proginit(&argc, argv);
if (argc-1 > 1)
pm_error("Too many arguments (%u). The only possible argument "
"is the input file name", argc-1);
if (argc-1 < 1)
cmdline.inputFileName = "-";
else
cmdline.inputFileName = argv[1];
ifP = pm_openr(cmdline.inputFileName);
if (streq(cmdline.inputFileName, "-"))
baseFileName = strdup("noname");
else
baseFileName = strippedOfExtension(cmdline.inputFileName);
ppm_readppminit(ifP, &cols, &rows, &maxval, &format);
pixelrow = ppm_allocrow(cols);
openComponentOut("red", baseFileName, &redfP);
openComponentOut("grn", baseFileName, &grnfP);
openComponentOut("blu", baseFileName, &blufP);
pgm_writepgminit(redfP, cols, rows, maxval, 0);
pgm_writepgminit(grnfP, cols, rows, maxval, 0);
pgm_writepgminit(blufP, cols, rows, maxval, 0);
grayrow = pgm_allocrow(cols);
for (row = 0; row < rows; ++row) {
unsigned int col;
ppm_readppmrow(ifP, pixelrow, cols, maxval, format);
for (col = 0; col < cols; ++col)
grayrow[col] = PPM_GETR(pixelrow[col]);
pgm_writepgmrow(redfP, grayrow, cols, maxval, 0);
for (col = 0; col < cols; ++col)
grayrow[col] = PPM_GETG(pixelrow[col]);
pgm_writepgmrow(grnfP, grayrow, cols, maxval, 0);
for (col = 0; col < cols; ++col)
grayrow[col] = PPM_GETB(pixelrow[col]);
pgm_writepgmrow(blufP, grayrow, cols, maxval, 0);
}
pgm_freerow(grayrow);
ppm_freerow(pixelrow);
pm_strfree(baseFileName);
pm_close(ifP);
pm_close(blufP);
pm_close(grnfP);
pm_close(redfP);
return 0;
}
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