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/* ----------------------------------------------------------------------
*
* Convert a PAM image to an AVS X image
*
* By Scott Pakin <scott+pbm@pakin.org>
*
* ----------------------------------------------------------------------
*
* Copyright (C) 2010 Scott Pakin <scott+pbm@pakin.org>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or (at
* your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see http://www.gnu.org/licenses/.
*
* ----------------------------------------------------------------------
*/
#include <stdio.h>
#include "pm.h"
#include "pam.h"
static char
sample2char(sample const s,
sample const maxval) {
/* Scale down a sample to a single byte. */
return maxval==255 ? s : s * 255 / maxval;
}
#define THIS_SAMPLE_CHAR(PLANE) \
sample2char(tuplerow[col][PLANE], pamP->maxval)
static void
produceAvs(struct pam * const pamP,
FILE * const avsFileP) {
tuple * tuplerow;
/* Write the AVS header (image width and height as 4-byte
big-endian integers).
*/
pm_writebiglong(avsFileP, pamP->width);
pm_writebiglong(avsFileP, pamP->height);
/* Write the AVS data (alpha, red, green, blue -- one byte apiece. */
tuplerow = pnm_allocpamrow(pamP);
switch (pamP->depth) {
case 1: {
/* Black-and-white or grayscale, no alpha */
unsigned int row;
for (row = 0; row < pamP->height; ++row) {
unsigned int col;
pnm_readpamrow(pamP, tuplerow);
for (col = 0; col < pamP->width; ++col) {
pm_writechar(avsFileP, (char)255);
pm_writechar(avsFileP, THIS_SAMPLE_CHAR(0));
pm_writechar(avsFileP, THIS_SAMPLE_CHAR(0));
pm_writechar(avsFileP, THIS_SAMPLE_CHAR(0));
}
}
} break;
case 2: {
/* Black-and-white or grayscale plus alpha */
unsigned int row;
for (row = 0; row < pamP->height; ++row) {
unsigned int col;
pnm_readpamrow(pamP, tuplerow);
for (col = 0; col < pamP->width; ++col) {
pm_writechar(avsFileP, THIS_SAMPLE_CHAR(1));
pm_writechar(avsFileP, THIS_SAMPLE_CHAR(0));
pm_writechar(avsFileP, THIS_SAMPLE_CHAR(0));
pm_writechar(avsFileP, THIS_SAMPLE_CHAR(0));
}
}
} break;
case 3: {
/* RGB, no alpha */
unsigned int row;
for (row = 0; row < pamP->height; ++row) {
unsigned int col;
pnm_readpamrow(pamP, tuplerow);
for (col = 0; col < pamP->width; ++col) {
pm_writechar(avsFileP, (char)255);
pm_writechar(avsFileP, THIS_SAMPLE_CHAR(0));
pm_writechar(avsFileP, THIS_SAMPLE_CHAR(1));
pm_writechar(avsFileP, THIS_SAMPLE_CHAR(2));
}
}
} break;
case 4: {
/* RGB plus alpha */
unsigned int row;
for (row = 0; row < pamP->height; ++row) {
unsigned int col;
pnm_readpamrow( pamP, tuplerow );
for (col = 0; col < pamP->width; ++col) {
pm_writechar(avsFileP, THIS_SAMPLE_CHAR(3));
pm_writechar(avsFileP, THIS_SAMPLE_CHAR(0));
pm_writechar(avsFileP, THIS_SAMPLE_CHAR(1));
pm_writechar(avsFileP, THIS_SAMPLE_CHAR(2));
}
}
} break;
default:
pm_error("Unrecognized PAM depth %u. We understand only "
"1, 2, 3, and 4", pamP->depth);
break;
}
pnm_freepamrow(tuplerow);
}
int
main(int argc, const char *argv[]) {
struct pam inPam;
const char * inputFilename;
FILE * inFileP;
pm_proginit(&argc, argv);
inputFilename = (argc > 1) ? argv[1] : "-";
inFileP = pm_openr(inputFilename);
pnm_readpaminit(inFileP, &inPam, PAM_STRUCT_SIZE(tuple_type));
produceAvs(&inPam, stdout);
pm_closer(inFileP);
return 0;
}
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