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/*
* Copyright (C) 2008, 2009 Christoph L. Spiel
*
* This file is part of Enblend.
*
* Enblend 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 2 of the License, or
* (at your option) any later version.
*
* Enblend 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 Enblend; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef __MGA_H__
#define __MGA_H__
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <iostream>
#include <iomanip>
#include <stdio.h>
#include "common.h"
#include "vigra/colorconversions.hxx"
using std::cerr;
using std::endl;
using vigra::NumericTraits;
using vigra::VigraFalseType;
using vigra::VigraTrueType;
namespace enblend {
template <typename InputType, typename ResultType>
class MultiGrayscaleAccessor
{
public:
typedef ResultType value_type;
MultiGrayscaleAccessor(const std::string& accessorName) {
typedef typename NumericTraits<InputType>::isScalar srcIsScalar;
initializeTypeSpecific(srcIsScalar());
initialize(accessorName);
}
ResultType operator()(const InputType& x) const {
typedef typename NumericTraits<InputType>::isScalar srcIsScalar;
return f(x, srcIsScalar());
}
template <class Iterator>
ResultType operator()(const Iterator& i) const {
typedef typename NumericTraits<InputType>::isScalar srcIsScalar;
return f(i, srcIsScalar());
}
template <class Iterator, class Difference>
ResultType operator()(const Iterator& i, Difference d) const {
typedef typename NumericTraits<InputType>::isScalar srcIsScalar;
return f(i, d, srcIsScalar());
}
static const std::string defaultGrayscaleAccessorName() {return "average";}
private:
typedef enum {AVERAGE, LSTAR, LIGHTNESS, VALUE, LUMINANCE, MIXER} AccKindType;
typedef std::map<std::string, AccKindType> NameMapType;
typedef typename NameMapType::const_iterator NameMapConstIterType;
#define CHANNEL_MIXER "channel-mixer"
void initializeAccessorNameMap() {
nameMap["average"] = AVERAGE;
nameMap["l-star"] = LSTAR;
nameMap["lightness"] = LIGHTNESS;
nameMap["value"] = VALUE;
nameMap["luminance"] = LUMINANCE;
nameMap[CHANNEL_MIXER] = MIXER;
}
void initialize(const std::string& accessorName) {
initializeAccessorNameMap();
if (accessorName.empty())
{
kind = nameMap[defaultGrayscaleAccessorName()];
}
else
{
std::string name(accessorName);
std::transform(name.begin(), name.end(), name.begin(), tolower);
NameMapConstIterType const k = nameMap.find(name);
if (k == nameMap.end())
{
char dummy;
double red, green, blue;
if (sscanf(name.c_str(),
CHANNEL_MIXER "%["
NUMERIC_OPTION_DELIMITERS "]%lf%["
NUMERIC_OPTION_DELIMITERS "]%lf%["
NUMERIC_OPTION_DELIMITERS "]%lf",
&dummy, &red, &dummy, &green, &dummy, &blue) == 6)
{
check_weights(red, green, blue);
const double sum = red + green + blue;
redWeight = red / sum;
greenWeight = green / sum;
blueWeight = blue / sum;
kind = MIXER;
}
else
{
cerr << command
<< ": unknown grayscale projector \"" << accessorName << "\""
<< endl;
exit(1);
}
}
else
{
kind = k->second;
if (kind == MIXER)
{
cerr << command
<< ": \"" CHANNEL_MIXER "\" is a grayscale projector requiring\n"
<< command
<< ": arguments like e.g. \"channel-mixer:0.30:0.59:0.11\""
<< endl;
exit(1);
}
}
}
}
void check_weights(double red, double green, double blue) const {
// TODO: check for isnormal(WEIGHT) before comparison
if (red < 0.0)
{
cerr << command
<< ": nonsensical weight of red channel (" << red << ")"
<< endl;
exit(1);
}
if (green < 0.0)
{
cerr << command
<< ": nonsensical weight of green channel (" << green << ")"
<< endl;
exit(1);
}
if (blue < 0.0)
{
cerr << command
<< ": nonsensical weight of blue channel (" << blue << ")"
<< endl;
exit(1);
}
if (red + green + blue == 0.0)
{
cerr << command
<< ": sum of channel weights is zero"
<< endl;
exit(1);
}
}
void initializeTypeSpecific(VigraTrueType) {}
void initializeTypeSpecific(VigraFalseType) {
typedef typename InputType::value_type ValueType;
labfun = vigra::RGB2LabFunctor<double>(NumericTraits<ValueType>::max());
}
ResultType project(const InputType& x) const {
typedef typename InputType::value_type ValueType;
switch (kind)
{
case AVERAGE:
return NumericTraits<ResultType>::fromRealPromote
((NumericTraits<ValueType>::toRealPromote(x.red()) +
NumericTraits<ValueType>::toRealPromote(x.green()) +
NumericTraits<ValueType>::toRealPromote(x.blue())) /
3.0);
case LSTAR:
{
typedef typename vigra::RGB2LabFunctor<double>::result_type LABResultType;
const LABResultType y = labfun.operator()(x) / 100.0;
return NumericTraits<ResultType>::fromRealPromote(NumericTraits<ValueType>::max() * y[0]);
}
case LIGHTNESS:
return NumericTraits<ResultType>::fromRealPromote
((std::min(x.red(), std::min(x.green(), x.blue())) +
std::max(x.red(), std::max(x.green(), x.blue()))) /
2.0);
case VALUE:
return std::max(x.red(), std::max(x.green(), x.blue()));
case LUMINANCE:
return NumericTraits<ResultType>::fromRealPromote(x.luminance());
case MIXER:
return NumericTraits<ResultType>::fromRealPromote
(redWeight * NumericTraits<ValueType>::toRealPromote(x.red()) +
greenWeight * NumericTraits<ValueType>::toRealPromote(x.green()) +
blueWeight * NumericTraits<ValueType>::toRealPromote(x.blue()));
}
// never reached
return ResultType();
}
// RGB
ResultType f(const InputType& x, VigraFalseType) const {
return project(x);
}
template <class Iterator>
ResultType f(const Iterator& i, VigraFalseType) const {
return project(*i);
}
template <class Iterator, class Difference>
ResultType f(const Iterator& i, Difference d, VigraFalseType) const {
return project(i[d]);
}
// grayscale
ResultType f(const InputType& x, VigraTrueType) const {return x;}
template <class Iterator>
ResultType f(const Iterator& i, VigraTrueType) const {return *i;}
template <class Iterator, class Difference>
ResultType f(const Iterator& i, Difference d, VigraTrueType) const {return i[d];}
NameMapType nameMap;
AccKindType kind;
double redWeight, greenWeight, blueWeight;
vigra::RGB2LabFunctor<double> labfun;
};
} // namespace enblend
#endif /* __MGA_H__ */
// Local Variables:
// mode: c++
// End:
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