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/******************************************************************************
pamfunc
*******************************************************************************
Apply one of various functions to each sample in a PAM image
By Bryan Henderson, San Jose CA 2002.06.16.
Contributed to the public domain
ENHANCEMENT IDEAS:
1) speed up by doing integer arithmetic instead of floating point for
multiply/divide where possible. Especially when multiplying by an
integer.
2) For multiply/divide, give option of simply changing the maxval and
leaving the raster alone.
******************************************************************************/
#include "pam.h"
#include "shhopt.h"
enum function {FN_MULTIPLY, FN_DIVIDE, FN_ADD, FN_SUBTRACT, FN_MIN, FN_MAX};
/* Note that when the user specifies a minimum, that means he's requesting
a "max" function.
*/
struct cmdlineInfo {
/* All the information the user supplied in the command line,
in a form easy for the program to use.
*/
const char *inputFilespec; /* Filespec of input file */
enum function function;
union {
float multiplier;
float divisor;
int adder;
int subtractor;
unsigned int max;
unsigned int min;
} u;
unsigned int verbose;
};
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 = malloc(100*sizeof(optEntry));
/* Instructions to OptParseOptions2 on how to parse our options.
*/
optStruct3 opt;
unsigned int option_def_index;
unsigned int multiplierSpec, divisorSpec, adderSpec, subtractorSpec;
unsigned int maxSpec, minSpec;
option_def_index = 0; /* incremented by OPTENTRY */
OPTENT3(0, "multiplier", OPT_FLOAT, &cmdlineP->u.multiplier,
&multiplierSpec, 0);
OPTENT3(0, "divisor", OPT_FLOAT, &cmdlineP->u.divisor,
&divisorSpec, 0);
OPTENT3(0, "adder", OPT_INT, &cmdlineP->u.adder,
&adderSpec, 0);
OPTENT3(0, "subtractor", OPT_INT, &cmdlineP->u.subtractor,
&subtractorSpec, 0);
OPTENT3(0, "min", OPT_UINT, &cmdlineP->u.min,
&minSpec, 0);
OPTENT3(0, "max", OPT_UINT, &cmdlineP->u.max,
&maxSpec, 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 (multiplierSpec + divisorSpec + adderSpec + subtractorSpec +
minSpec + maxSpec > 1)
pm_error("You may specify at most one of -multiplier, -divisor,"
"-adder, -subtractor, -min, and -max");
if (multiplierSpec) {
cmdlineP->function = FN_MULTIPLY;
if (cmdlineP->u.multiplier < 0)
pm_error("Multiplier must be nonnegative. You specified %f",
cmdlineP->u.multiplier);
} else if (divisorSpec) {
cmdlineP->function = FN_DIVIDE;
if (cmdlineP->u.divisor < 0)
pm_error("Divisor must be nonnegative. You specified %f",
cmdlineP->u.divisor);
} else if (adderSpec) {
cmdlineP->function = FN_ADD;
} else if (subtractorSpec) {
cmdlineP->function = FN_SUBTRACT;
} else if (minSpec) {
cmdlineP->function = FN_MAX;
} else if (maxSpec) {
cmdlineP->function = FN_MIN;
} else
pm_error("You must specify one of -multiplier, -divisor, "
"-adder, -subtractor, -min, or -max");
if (argc-1 > 1)
pm_error("Too many arguments (%d). File spec is the only argument.",
argc-1);
if (argc-1 < 1)
cmdlineP->inputFilespec = "-";
else
cmdlineP->inputFilespec = argv[1];
}
static void
applyFunction(struct cmdlineInfo const cmdline,
struct pam const inpam,
struct pam const outpam,
tuple * const inputRow,
tuple * const outputRow) {
float const oneOverDivisor = 1/cmdline.u.divisor;
/* In my experiments, the compiler couldn't figure out that
1/cmdline.u.divisor is a constant and instead recomputed it
for each and every pixel. division is slower than
multiplication, so we want to multiply by
1/cmdline.u.divisor instead of divide by cmdline.u.divisor,
so we compute that here. Note that if the function isn't
divide, both cmdline.u.divisor and oneOverDivisor are
meaningless.
*/
int col;
for (col = 0; col < inpam.width; ++col) {
int plane;
for (plane = 0; plane < inpam.depth; ++plane) {
sample const inSample = inputRow[col][plane];
sample outSample; /* Could be > maxval */
switch (cmdline.function) {
case FN_MULTIPLY:
outSample = ROUNDU(inSample * cmdline.u.multiplier);
break;
case FN_DIVIDE:
outSample = ROUNDU(inSample * oneOverDivisor);
break;
case FN_ADD:
outSample = MAX(0, (long)inSample + cmdline.u.adder);
break;
case FN_SUBTRACT:
outSample = MAX(0, (long)inSample - cmdline.u.subtractor);
break;
case FN_MAX:
outSample = MAX(inSample, cmdline.u.min);
break;
case FN_MIN:
outSample = MIN(inSample, cmdline.u.max);
break;
}
outputRow[col][plane] = MIN(outpam.maxval, outSample);
}
}
}
int
main(int argc, char *argv[]) {
FILE* ifP;
tuple* inputRow; /* Row from input image */
tuple* outputRow; /* Row of output image */
int row;
struct cmdlineInfo cmdline;
struct pam inpam; /* Input PAM image */
struct pam outpam; /* Output PAM image */
pnm_init( &argc, argv );
parseCommandLine(argc, argv, &cmdline);
ifP = pm_openr(cmdline.inputFilespec);
pnm_readpaminit(ifP, &inpam, PAM_STRUCT_SIZE(tuple_type));
inputRow = pnm_allocpamrow(&inpam);
outpam = inpam; /* Initial value -- most fields should be same */
outpam.file = stdout;
pnm_writepaminit(&outpam);
outputRow = pnm_allocpamrow(&outpam);
for (row = 0; row < inpam.height; row++) {
pnm_readpamrow(&inpam, inputRow);
applyFunction(cmdline, inpam, outpam, inputRow, outputRow);
pnm_writepamrow(&outpam, outputRow);
}
pnm_freepamrow(outputRow);
pnm_freepamrow(inputRow);
pm_close(inpam.file);
pm_close(outpam.file);
exit(0);
}
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