/*
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * This program 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.
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 * This program 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.
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 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
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/** \file blender/freestyle/intern/stroke/AdvancedFunctions0D.cpp
 *  \ingroup freestyle
 *  \brief Functions taking 0D input
 *  \author Stephane Grabli
 *  \author Emmanuel Turquin
 *  \date 01/07/2003
 */

#include "AdvancedFunctions0D.h"
#include "Canvas.h"

#include "../view_map/Functions0D.h"
#include "../view_map/SteerableViewMap.h"

namespace Freestyle {

namespace Functions0D {

int DensityF0D::operator()(Interface0DIterator& iter)
{
	Canvas *canvas = Canvas::getInstance();
	int bound = _filter.getBound();

	if ((iter->getProjectedX() - bound < 0) || (iter->getProjectedX() + bound>canvas->width()) ||
	    (iter->getProjectedY() - bound < 0) || (iter->getProjectedY() + bound>canvas->height()))
	{
		result = 0.0;
		return 0;
	}

	RGBImage image;
	canvas->readColorPixels((int)iter->getProjectedX() - bound, (int)iter->getProjectedY() - bound,
	                        _filter.maskSize(), _filter.maskSize(), image);
	result = _filter.getSmoothedPixel<RGBImage>(&image, (int)iter->getProjectedX(), (int)iter->getProjectedY());

	return 0;
}


int LocalAverageDepthF0D::operator()(Interface0DIterator& iter)
{
	Canvas *iViewer = Canvas::getInstance();
	int bound = _filter.getBound();

	if ((iter->getProjectedX() - bound < 0) || (iter->getProjectedX() + bound>iViewer->width()) ||
	    (iter->getProjectedY() - bound < 0) || (iter->getProjectedY() + bound>iViewer->height()))
	{
		result = 0.0;
		return 0;
	}

	GrayImage image;
	iViewer->readDepthPixels((int)iter->getProjectedX() - bound, (int)iter->getProjectedY() - bound,
	                         _filter.maskSize(), _filter.maskSize(), image);
	result = _filter.getSmoothedPixel(&image, (int)iter->getProjectedX(), (int)iter->getProjectedY());

	return 0;
}

int ReadMapPixelF0D::operator()(Interface0DIterator& iter)
{
	Canvas *canvas = Canvas::getInstance();
	result = canvas->readMapPixel(_mapName, _level, (int)iter->getProjectedX(), (int)iter->getProjectedY());
	return 0;
}

int ReadSteerableViewMapPixelF0D::operator()(Interface0DIterator& iter)
{
	SteerableViewMap *svm = Canvas::getInstance()->getSteerableViewMap();
	result = svm->readSteerableViewMapPixel(_orientation, _level, (int)iter->getProjectedX(),
	                                        (int)iter->getProjectedY());
	return 0;
}

int ReadCompleteViewMapPixelF0D::operator()(Interface0DIterator& iter)
{
	SteerableViewMap *svm = Canvas::getInstance()->getSteerableViewMap();
	result = svm->readCompleteViewMapPixel(_level, (int)iter->getProjectedX(), (int)iter->getProjectedY());
	return 0;
}

int GetViewMapGradientNormF0D::operator()(Interface0DIterator& iter)
{
	SteerableViewMap *svm = Canvas::getInstance()->getSteerableViewMap();
	float pxy = svm->readCompleteViewMapPixel(_level, (int)iter->getProjectedX(), (int)iter->getProjectedY());
	float gx = svm->readCompleteViewMapPixel(_level, (int)iter->getProjectedX() + _step,
	                                         (int)iter->getProjectedY()) - pxy;
	float gy = svm->readCompleteViewMapPixel(_level, (int)iter->getProjectedX(),
	                                         (int)iter->getProjectedY() + _step) - pxy;
	result = Vec2f(gx, gy).norm();
	return 0;
}

} // end of namespace Functions0D

} /* namespace Freestyle */