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/*=============================================================================
pamdepth
===============================================================================
Change the maxval in a Netpbm image.
This replaces Pnmdepth.
By Bryan Henderson January 2006.
Contributed to the public domain by its author.
=============================================================================*/
#include <assert.h>
#include "shhopt.h"
#include "mallocvar.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 * inputFileName;
unsigned int newMaxval;
unsigned int verbose;
};
static void
parseCommandLine(int argc, char ** argv,
struct cmdlineInfo *cmdlineP) {
/*----------------------------------------------------------------------------
Note that the file spec strings we return are stored in the storage that
was passed to us as the argv array.
-----------------------------------------------------------------------------*/
optEntry * option_def;
/* Instructions to optParseOptions3 on how to parse our options.
*/
optStruct3 opt;
unsigned int option_def_index;
MALLOCARRAY_NOFAIL(option_def, 100);
option_def_index = 0; /* incremented by OPTENTRY */
OPTENT3(0, "verbose", OPT_STRING, 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 some of *cmdlineP and others. */
if (argc-1 < 1)
pm_error("You must specify at least one argument -- the new maxval");
else {
int const intval = atoi(argv[1]);
if (intval < 1)
pm_error("New maxval must be at least 1. You specified %d",
intval);
else if (intval > PNM_OVERALLMAXVAL)
pm_error("newmaxval (%d) is too large.\n"
"The maximum allowed by the PNM formats is %d.",
intval, PNM_OVERALLMAXVAL);
else
cmdlineP->newMaxval = intval;
if (argc-1 < 2)
cmdlineP->inputFileName = "-";
else
cmdlineP->inputFileName = argv[2];
}
}
static void
createSampleMap(sample const oldMaxval,
sample const newMaxval,
sample** const sampleMapP) {
unsigned int i;
sample * sampleMap;
MALLOCARRAY_NOFAIL(sampleMap, oldMaxval+1);
for (i = 0; i <= oldMaxval; ++i)
sampleMap[i] = (i * newMaxval + oldMaxval / 2) / oldMaxval;
*sampleMapP = sampleMap;
}
static void
transformRaster(struct pam * const inpamP,
struct pam * const outpamP) {
tuple * tuplerow;
unsigned int row;
sample * sampleMap; /* malloc'ed */
createSampleMap(inpamP->maxval, outpamP->maxval, &sampleMap);
assert(inpamP->height == outpamP->height);
assert(inpamP->width == outpamP->width);
assert(inpamP->depth == outpamP->depth);
tuplerow = pnm_allocpamrow(inpamP);
for (row = 0; row < inpamP->height; ++row) {
unsigned int col;
pnm_readpamrow(inpamP, tuplerow);
for (col = 0; col < inpamP->width; ++col) {
unsigned int plane;
for (plane = 0; plane < inpamP->depth; ++plane)
tuplerow[col][plane] = sampleMap[tuplerow[col][plane]];
}
pnm_writepamrow(outpamP, tuplerow);
}
pnm_freepamrow(tuplerow);
free(sampleMap);
}
int
main(int argc,
char * argv[]) {
struct cmdlineInfo cmdline;
FILE * ifP;
struct pam inpam;
struct pam outpam;
bool eof;
pnm_init(&argc, argv);
parseCommandLine(argc, argv, &cmdline);
ifP = pm_openr(cmdline.inputFileName);
eof = FALSE;
while (!eof) {
pnm_readpaminit(ifP, &inpam, PAM_STRUCT_SIZE(tuple_type));
outpam = inpam; /* initial value */
outpam.file = stdout;
outpam.maxval = cmdline.newMaxval;
if (PNM_FORMAT_TYPE(inpam.format) == PBM_TYPE) {
pm_message( "promoting from PBM to PGM" );
outpam.format = PGM_TYPE;
} else
outpam.format = inpam.format;
pnm_writepaminit(&outpam);
transformRaster(&inpam, &outpam);
pnm_nextimage(ifP, &eof);
}
pm_close(ifP);
pm_close(stdout);
return 0;
}
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