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#include <string.h>
#include <nstring.h>
#include <pm_gamma.h>
#include <pam.h>
#include "pm_c_util.h"
#include "shhopt.h"
#include "mallocvar.h"
typedef unsigned int uint;
typedef struct {
/*----------------------------------------------------------------------------
Specification of a circular "region" over which to measure the average color
-----------------------------------------------------------------------------*/
uint x; /* coordinates of the center */
uint y; /* of the region; */
const char * label; /* optional label supplied on the command line */
} RegSpec;
typedef struct {
/*----------------------------------------------------------------------------
Represents a single color measurement over a "region"
-----------------------------------------------------------------------------*/
uint area; /* area in pixels over which to average the color */
/* cumulative normalized intensity-proportiunal value of the region: */
double color[3];
} RegData;
typedef struct {
/*----------------------------------------------------------------------------
All the information the user supplied in the command line, in a form easy
for the program to use.
-----------------------------------------------------------------------------*/
uint linear;
uint radius;
uint regN; /* number of regions */
uint maxLbLen; /* maximum label length */
RegSpec * regSpecs;
/* list of points to sample, dynamically allocated*/
const char * formatStr; /* output color format as string */
uint formatId; /* the Id of the selected color format */
uint formatArg; /* the argument to the color formatting function */
const char * infile;
} CmdLineInfo;
/* Generic pointer to a color-formatting function. Returns the textual
representation of the color <tuple> in terms of the image pointed to
by <pamP>. <param> is a generic integer parameter that depends on the
specific function and may denote precision or maxval.
*/
typedef const char *
(*FormatColor)(struct pam * const pamP,
tuple const color,
uint const param);
typedef struct ColorFormat {
/*----------------------------------------------------------------------------
The color format specification
-----------------------------------------------------------------------------*/
char const * id;
/* format id (compared against the -format command-line argument) */
FormatColor const formatColor;
/* function that returns converts a color into this format */
char const * argName;
/* meaning of the <param> argument of <formatColor>() */
uint const defParam;
/* default value of that argument */
uint const maxParam;
/* maximum value of that argument */
} ColorFormat;
static const char *
fcInt(struct pam * const pamP,
tuple const color,
uint const param) {
/*----------------------------------------------------------------------------
Format 'color' as an integer tuple with maxval 'param'
-----------------------------------------------------------------------------*/
return pnm_colorspec_rgb_integer(pamP, color, param);
}
static const char *
fcNorm(struct pam * const pamP,
tuple const color,
uint const param) {
/*----------------------------------------------------------------------------
Format 'color' as normalized tuple with precision 'param'
-----------------------------------------------------------------------------*/
return pnm_colorspec_rgb_norm(pamP, color, param);
}
static const char *
fcX11(struct pam * const pamP,
tuple const color,
uint const param) {
/*----------------------------------------------------------------------------
Format 'color' as hexadecimal tuple with 'param' digits
-----------------------------------------------------------------------------*/
return pnm_colorspec_rgb_x11(pamP, color, param);
}
static int const defaultFormat = 0;
/* Table with the full information about color formats */
ColorFormat const formats[ 3 ] = {
/* Id Function Argument name Default Max */
{ "int", &fcInt, "maxval", 255, 65535 },
{ "norm", &fcNorm, "digit count", 3, 6 },
{ "x11", &fcX11, "digit count", 2, 4 }
};
static inline uint
sqri(int const v) {
return v * v;
}
static RegSpec
parsedRegSpec(const char * const s) {
/*----------------------------------------------------------------------------
The region specification represented by command line argument 's'.
's' is of the format x,y[:label].
-----------------------------------------------------------------------------*/
char * end;
char * start;
RegSpec res;
start = (char *)s;
res.x = strtol(start, &end, 10);
do {
if (start == end)
break; /* x not parsed */
start = end;
if (*end != ',')
break; /* no comma after x */
start = end + 1;
res.y = strtol(start, &end, 10);
if (start == end)
break; /* y not parsed */
/* these multiple returns to avoid goto and deep nesting: */
if (*end == '\0') { /* no label specified */
res.label = (char *)s;
return res;
}
if (*end == ':') { /* a label specified */
res.label = end + 1;
if (*res.label == '\0')
break; /* empty label */
return res;
}
} while (false);
pm_error("Wrong region specification: %s", s);
return res; /* to avoid the false warning that nothing is returned */
}
static void
parseColorFmt(const char * const formatStr,
uint * const formatIdP,
uint * const formatArgP) {
/*----------------------------------------------------------------------------
Parse the color format specification string 'formatStr' as
*formatIdP and *formatArgP.
A format specification string is of format format[:arg].
-----------------------------------------------------------------------------*/
const char * const errSpec = "Wrong color format specification: ";
const char * colonLoc; /* location of the colon in the specification */
uint n, f;
const ColorFormat * formatP;
uint formatId;
bool found;
colonLoc = strchr(formatStr, ':');
if (colonLoc != NULL) n = colonLoc - formatStr;
else n = strlen(formatStr);
for (f = 0, found = false; f < ARRAY_SIZE(formats) && !found; ++f) {
if (strncmp(formatStr, formats[f].id, n) == 0) {
found = true;
formatId = f;
}
}
if (!found)
pm_error("Color format not recognized.");
*formatIdP = formatId;
formatP = &formats[formatId];
if (colonLoc) {
long int arg;
const char * argStart;
char * argEnd;
argStart = colonLoc + 1;
if (*argStart == '\0')
pm_error("%sthe colon should be followed by %s.",
errSpec, formatP->argName);
arg = strtol(argStart, &argEnd, 10);
if (*argEnd != '\0')
pm_error("%sfailed to parse the %s: %s.",
errSpec, formatP->argName, argStart);
if (arg < 1)
pm_error("%s%s must be greater than zero.",
errSpec, formatP->argName);
if (arg > formatP->maxParam)
pm_error("%s%s cannot exceed %i.",
errSpec, formatP->argName, formatP->maxParam);
*formatArgP = arg;
} else
*formatArgP = formatP->defParam;
}
static CmdLineInfo
parsedCommandLine(int argc,
const char ** const argv) {
optEntry * option_def;
/* Instructions to OptParseOptions3 on how to parse our options.
*/
optStruct3 opt;
unsigned int option_def_index;
CmdLineInfo cmdLine;
uint infileSpec, radiusSpec, formatSpec, linearSpec;
MALLOCARRAY_NOFAIL(option_def, 100);
option_def_index = 0; /* incremented by OPTENT3 */
OPTENT3(0, "infile", OPT_STRING, &cmdLine.infile, &infileSpec, 0);
OPTENT3(0, "radius", OPT_INT, &cmdLine.radius, &radiusSpec, 0);
OPTENT3(0, "format", OPT_STRING, &cmdLine.formatStr, &formatSpec, 0);
OPTENT3(0, "linear", OPT_FLAG, &cmdLine.linear, &linearSpec, 0);
OPTENT3(0, 0, OPT_END, NULL, NULL, 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 */
pm_optParseOptions3(&argc, (char **)argv, opt, sizeof(opt), 0);
if (!infileSpec)
cmdLine.infile = "-";
if (!radiusSpec)
cmdLine.radius = 0;
if (formatSpec) {
parseColorFmt(cmdLine.formatStr,
&cmdLine.formatId, &cmdLine.formatArg);
} else {
cmdLine.formatId = defaultFormat;
cmdLine.formatArg = formats[defaultFormat].defParam;
}
if (!linearSpec)
cmdLine.radius = 0;
if (argc-1 < 1)
pm_error("No regions specified.");
cmdLine.regN = argc - 1;
MALLOCARRAY(cmdLine.regSpecs, cmdLine.regN);
if (!cmdLine.regSpecs)
pm_error("Could not get memory for %u region specifications",
cmdLine.regN);
{
uint r;
uint maxLbLen;
for (r = 0, maxLbLen = 0; r < argc - 1; ++r) {
size_t lbLen;
cmdLine.regSpecs[r] = parsedRegSpec(argv[r+1]);
lbLen = strlen(cmdLine.regSpecs[r].label);
maxLbLen = MAX(maxLbLen, lbLen);
}
cmdLine.maxLbLen = maxLbLen;
}
free(option_def);
return cmdLine;
}
static void
freeCommandLine(CmdLineInfo const cmdLine) {
free(cmdLine.regSpecs);
}
static RegData *
allocRegSamples(uint n) {
/*----------------------------------------------------------------------------
Allocate an array of <n> initialized region samples. The array should be
freed after use.
-----------------------------------------------------------------------------*/
uint r;
RegData * regSamples;
regSamples = calloc(n, sizeof(RegData));
for (r = 0; r < n; ++r) {
uint l;
regSamples[r].area = 0;
for (l = 0; l < 3; ++l)
regSamples[r].color[l] = 0.0;
}
return regSamples;
}
static uint
getYmax(struct pam * const pamP,
CmdLineInfo const cmdLine) {
/*----------------------------------------------------------------------------
Find the maximum row in the image that contains a pixel from a region.
-----------------------------------------------------------------------------*/
uint ymax, r, ycmax;
ycmax = 0;
for (r = 0; r < cmdLine.regN; ++r) {
RegSpec spec = cmdLine.regSpecs[r];
if (spec.y >= pamP->height || spec.x >= pamP->width)
pm_error("Region at %i,%i is outside the image boundaries.",
spec.x, spec.y);
if (spec.y > ycmax)
ycmax = spec.y;
}
ymax = MIN(pamP->height - 1, ycmax + cmdLine.radius);
return ymax;
}
static void
readChord(RegData * const dataP,
uint const linear,
struct pam * const pamP,
tuple * const row,
uint const x0,
uint const x1) {
/*----------------------------------------------------------------------------
Update region sample *dataP with the data from horizontal chord lying in row
'row' and going from 'x0' to 'x1'. 'linear' means tuples in 'row' are the
intensity-linear values as opposed to normal libnetpbm gamma-adjusted
values.
-----------------------------------------------------------------------------*/
uint x;
for (x = x0; x <= x1; ++x) {
uint l;
for (l = 0; l < 3; ++l) {
double val;
val = (double)row[x][l] / pamP->maxval;
/* convert to intensity because brightness is not additive: */
if (!linear)
val = pm_ungamma709(val);
dataP->color[l] += val;
}
++dataP->area;
}
}
static void
processRow(tuple * const row,
uint const y,
struct pam * const pamP,
const CmdLineInfo * const cmdLineP,
RegData * const regSamples) {
/*----------------------------------------------------------------------------
Read a row from image described by *pamP into 'row', and update region
samples regSamples[] from it. 'y' is the position of the row.
-----------------------------------------------------------------------------*/
uint r;
pnm_readpamrow(pamP, row);
for (r = 0; r < cmdLineP->regN; ++r) {
RegSpec const spec = cmdLineP->regSpecs[r];
RegData * const dataP = ®Samples[r];
int const yd = (int)spec.y - (int)y;
if (abs(yd) > cmdLineP->radius) {
/* Row is entirely above or below the region; Avoid the slow root
operation
*/
} else {
uint const xd2 = sqri(cmdLineP->radius) - sqri(yd);
uint const xd = ROUNDU(sqrt((double)xd2));
int x0, x1;
x0 = spec.x - xd; /* initial value */
x1 = spec.x + xd; /* initial value */
/* clip horizontal chord to image boundaries: */
if (x0 < 0)
x0 = 0;
if (x1 >= pamP->width)
x1 = pamP->width - 1;
readChord(dataP, cmdLineP->linear, pamP, row, x0, x1);
}
}
}
static RegData *
colorsFmImage(struct pam * const pamP,
CmdLineInfo const cmdLine) {
/*----------------------------------------------------------------------------
Color data for the regions requested by 'cmdLine' in the image described by
*pamP.
-----------------------------------------------------------------------------*/
uint y, ymax;
RegData * samplesP;
tuple * row;
FILE * ifP;
ifP = pm_openr(cmdLine.infile);
pnm_readpaminit(ifP, pamP, PAM_STRUCT_SIZE(tuple_type));
ymax = getYmax(pamP, cmdLine);
samplesP = allocRegSamples(cmdLine.regN);
row = pnm_allocpamrow(pamP);
for (y = 0; y <= ymax; ++y)
processRow(row, y, pamP, &cmdLine, samplesP);
pnm_freepamrow(row);
pm_close(ifP);
return samplesP;
}
static const char *
outputColorSpec(RegData const data,
CmdLineInfo const cmdLine,
struct pam * const pamP,
tuple const tup) {
/*----------------------------------------------------------------------------
Color of region sample 'data' formatted for output as requested by
'cmdLine'.
*pamP tells how to interpret 'data'.
'tup' is working space for internal use.
-----------------------------------------------------------------------------*/
uint l;
for (l = 0; l < 3; ++l)
tup[l] = pm_gamma709(data.color[l]/data.area) * pamP->maxval;
return formats[cmdLine.formatId].
formatColor(pamP, tup, cmdLine.formatArg);
}
static void
printColors(struct pam * const pamP,
CmdLineInfo const cmdLine,
FILE * const ofP,
const RegData * const regSamples) {
/*----------------------------------------------------------------------------
Print the colors regSamples[] to *ofP in the format
requested by 'cmdLine'.
*pamP tells how to interpret regSamples[]
-----------------------------------------------------------------------------*/
char fmt[20];
uint r;
tuple tup;
tup = pnm_allocpamtuple(pamP);
pm_snprintf(fmt, sizeof(fmt), "%%%is: %%s\n", cmdLine.maxLbLen);
for (r = 0; r < cmdLine.regN; ++r) {
RegSpec spec;
RegData data;
const char * color;
spec = cmdLine.regSpecs[r];
data = regSamples[r];
color = outputColorSpec(data, cmdLine, pamP, tup);
fprintf(ofP, fmt, spec.label, color);
pm_strfree(color);
}
pnm_freepamtuple(tup);
}
int
main(int argc, const char *argv[]) {
RegData * regSamples;
CmdLineInfo cmdLine;
struct pam pam;
pm_proginit(&argc, argv);
cmdLine = parsedCommandLine(argc, argv);
regSamples = colorsFmImage(&pam, cmdLine);
printColors(&pam, cmdLine, stdout, regSamples);
freeCommandLine(cmdLine);
free(regSamples);
return 0;
}
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