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#include "pam.h"
#include "shhopt.h"
#include "mallocvar.h"
struct cmdlineInfo {
/* All the information the user supplied in the command line,
in a form easy for the program to use.
*/
const char * inputFilespec;
const char * maskFilespec;
unsigned int verbose;
float sharpness;
float threshold;
};
static void
parseCommandLine(int argc, char ** const 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.
-----------------------------------------------------------------------------*/
optEntry *option_def;
/* Instructions to OptParseOptions2 on how to parse our options.
*/
optStruct3 opt;
unsigned int option_def_index;
unsigned int sharpSpec, thresholdSpec;
MALLOCARRAY_NOFAIL(option_def, 100);
option_def_index = 0; /* incremented by OPTENTRY */
OPTENT3(0, "sharpness", OPT_FLOAT, &cmdlineP->sharpness,
&sharpSpec, 0);
OPTENT3(0, "threshold", OPT_FLOAT, &cmdlineP->threshold,
&thresholdSpec, 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 have no parms that are negative numbers */
optParseOptions3(&argc, argv, opt, sizeof(opt), 0);
/* Uses and sets argc, argv, and some of *cmdlineP and others. */
if (sharpSpec) {
if (cmdlineP->sharpness < 0)
pm_error("-sharpness less than zero doesn't make sense. "
"You specified %f", cmdlineP->sharpness);
} else
cmdlineP->sharpness = 1.0;
if (thresholdSpec) {
if (cmdlineP->threshold < 0)
pm_error("-threshold less than zero doesn't make sense. "
"You specified %f", cmdlineP->threshold);
if (cmdlineP->threshold > 1.0)
pm_error("-threshold greater than unity doesn't make sense. "
"You specified %f", cmdlineP->threshold);
} else
cmdlineP->threshold = 0.0;
if (argc-1 < 1)
pm_error("You must specify at least one argument: The name "
"of the mask image file");
else {
cmdlineP->maskFilespec = argv[1];
if (argc-1 < 2)
cmdlineP->inputFilespec = "-";
else {
cmdlineP->inputFilespec = argv[2];
if (argc-1 > 2)
pm_error("There are at most two arguments: mask file name "
"and input file name. You specified %d", argc-1);
}
}
}
static sample
sharpened(sample const inputSample,
sample const maskSample,
float const sharpness,
sample const threshold,
sample const maxval) {
int const edgeness = inputSample - maskSample;
sample retval;
if (abs(edgeness) > threshold) {
float const rawResult = inputSample + edgeness * sharpness;
retval = MIN(maxval, (unsigned)MAX(0, (int)(rawResult+0.5)));
} else
retval = inputSample;
return retval;
}
int
main(int argc, char *argv[]) {
struct cmdlineInfo cmdline;
struct pam inpam;
struct pam maskpam;
struct pam outpam;
FILE * ifP;
FILE * maskfP;
tuple * inputTuplerow;
tuple * maskTuplerow;
tuple * outputTuplerow;
unsigned int row;
sample threshold;
/* Magnitude of difference between image and unsharp mask below
which they will be considered identical.
*/
pnm_init(&argc, argv);
parseCommandLine(argc, argv, &cmdline);
ifP = pm_openr(cmdline.inputFilespec);
maskfP = pm_openr(cmdline.maskFilespec);
pnm_readpaminit(ifP, &inpam, PAM_STRUCT_SIZE(tuple_type));
pnm_readpaminit(maskfP, &maskpam, PAM_STRUCT_SIZE(tuple_type));
if (inpam.width != maskpam.width ||
inpam.height != maskpam.height ||
inpam.depth != maskpam.depth)
pm_error("The mask image must be the same dimensions as the "
"input image. The mask is %dx%dx%d, but the input is "
"%dx%dx%d.",
maskpam.width, maskpam.height, maskpam.depth,
inpam.width, inpam.height, inpam.depth);
if (inpam.maxval != maskpam.maxval)
pm_error("The mask image must have the same maxval as the "
"input image. The input image has maxval %u, "
"but the mask image has maxval %u",
(unsigned)inpam.maxval, (unsigned)maskpam.maxval);
threshold = (float)cmdline.threshold / inpam.maxval;
outpam = inpam;
outpam.file = stdout;
inputTuplerow = pnm_allocpamrow(&inpam);
maskTuplerow = pnm_allocpamrow(&maskpam);
outputTuplerow = pnm_allocpamrow(&outpam);
pnm_writepaminit(&outpam);
for (row = 0; row < outpam.height; ++row) {
unsigned int col;
pnm_readpamrow(&inpam, inputTuplerow);
pnm_readpamrow(&maskpam, maskTuplerow);
for (col = 0; col < outpam.width; ++col) {
unsigned int plane;
for (plane = 0; plane < outpam.depth; ++plane) {
outputTuplerow[col][plane] =
sharpened(inputTuplerow[col][plane],
maskTuplerow[col][plane],
cmdline.sharpness,
threshold,
outpam.maxval);
}
}
pnm_writepamrow(&outpam, outputTuplerow);
}
pm_close(ifP);
pm_close(maskfP);
pnm_freepamrow(inputTuplerow);
pnm_freepamrow(maskTuplerow);
pnm_freepamrow(outputTuplerow);
return 0;
}
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