DeltaFunctionKernel.cc

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// -*- LSST-C++ -*-

/*
 * LSST Data Management System
 * Copyright 2008, 2009, 2010 LSST Corporation.
 *
 * This product includes software developed by the
 * LSST Project (http://www.lsst.org/).
 *
 * 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 3 of the License, or
 * (at your option) any later version.
 *
 * 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.
 *
 * You should have received a copy of the LSST License Statement and
 * the GNU General Public License along with this program.  If not,
 * see <http://www.lsstcorp.org/LegalNotices/>.
 */
#include <sstream>
#include <vector>

#include "lsst/pex/exceptions.h"
#include "lsst/afw/math/Kernel.h"
#include "lsst/afw/math/KernelPersistenceHelper.h"
#include "lsst/afw/table/io/Persistable.cc"

namespace pexExcept = lsst::pex::exceptions;

namespace lsst {
namespace afw {

template std::shared_ptr<math::DeltaFunctionKernel> table::io::PersistableFacade<
        math::DeltaFunctionKernel>::dynamicCast(std::shared_ptr<table::io::Persistable> const&);

namespace math {

DeltaFunctionKernel::DeltaFunctionKernel(int width, int height, lsst::geom::Point2I const& point)
        : Kernel(width, height, 0), _pixel(point) {
    if (point.getX() < 0 || point.getX() >= width || point.getY() < 0 || point.getY() >= height) {
        std::ostringstream os;
        os << "point (" << point.getX() << ", " << point.getY() << ") lies outside " << width << "x" << height
           << " sized kernel";
        throw LSST_EXCEPT(pexExcept::InvalidParameterError, os.str());
    }
}

std::shared_ptr<Kernel> DeltaFunctionKernel::clone() const {
    std::shared_ptr<Kernel> retPtr(
            new DeltaFunctionKernel(this->getWidth(), this->getHeight(), this->_pixel));
    retPtr->setCtr(this->getCtr());
    return retPtr;
}

std::shared_ptr<Kernel> DeltaFunctionKernel::resized(int width, int height) const {
    int padX = width - getWidth();
    int padY = height - getHeight();
    if ((padX % 2) || (padY % 2)) {
        std::ostringstream os;
        os << "Cannot resize DeltaFunctionKernel from (" << getWidth() << ", " << getHeight() << ") to ("
           << width << ", " << height << "), because at least one dimension would change by an odd value.";
        throw LSST_EXCEPT(pexExcept::InvalidParameterError, os.str());
    }
    int newPixelX = getPixel().getX() + padX / 2;
    int newPixelY = getPixel().getY() + padY / 2;
    std::shared_ptr<Kernel> retPtr =
            std::make_shared<DeltaFunctionKernel>(width, height, lsst::geom::Point2I(newPixelX, newPixelY));
    return retPtr;
}

std::string DeltaFunctionKernel::toString(std::string const& prefix) const {
    const int pixelX = getPixel().getX();  // active pixel in Kernel
    const int pixelY = getPixel().getY();

    std::ostringstream os;
    os << prefix << "DeltaFunctionKernel:" << std::endl;
    os << prefix << "Pixel (c,r) " << pixelX << "," << pixelY << ")" << std::endl;
    os << Kernel::toString(prefix + "\t");
    return os.str();
}

double DeltaFunctionKernel::doComputeImage(image::Image<Pixel>& image, bool) const {
    const int pixelX = getPixel().getX();  // active pixel in Kernel
    const int pixelY = getPixel().getY();

    image = 0;
    *image.xy_at(pixelX, pixelY) = 1;

    return 1;
}

// ------ Persistence ---------------------------------------------------------------------------------------

namespace {

struct DeltaFunctionKernelPersistenceHelper : public Kernel::PersistenceHelper {
    table::PointKey<int> pixel;

    static DeltaFunctionKernelPersistenceHelper const& get() {
        static DeltaFunctionKernelPersistenceHelper const instance;
        return instance;
    }

    // No copying
    DeltaFunctionKernelPersistenceHelper(const DeltaFunctionKernelPersistenceHelper&) = delete;
    DeltaFunctionKernelPersistenceHelper& operator=(const DeltaFunctionKernelPersistenceHelper&) = delete;

    // No moving
    DeltaFunctionKernelPersistenceHelper(DeltaFunctionKernelPersistenceHelper&&) = delete;
    DeltaFunctionKernelPersistenceHelper& operator=(DeltaFunctionKernelPersistenceHelper&&) = delete;

private:
    explicit DeltaFunctionKernelPersistenceHelper()
            : Kernel::PersistenceHelper(0),
              pixel(table::PointKey<int>::addFields(schema, "pixel", "position of nonzero pixel", "pixel")) {}
};

}  // namespace

class DeltaFunctionKernel::Factory : public afw::table::io::PersistableFactory {
public:
    std::shared_ptr<afw::table::io::Persistable> read(InputArchive const& archive,
                                                      CatalogVector const& catalogs) const override {
        LSST_ARCHIVE_ASSERT(catalogs.size() == 1u);
        LSST_ARCHIVE_ASSERT(catalogs.front().size() == 1u);
        DeltaFunctionKernelPersistenceHelper const& keys = DeltaFunctionKernelPersistenceHelper::get();
        LSST_ARCHIVE_ASSERT(catalogs.front().getSchema() == keys.schema);
        afw::table::BaseRecord const& record = catalogs.front().front();
        std::shared_ptr<DeltaFunctionKernel> result(
                new DeltaFunctionKernel(record.get(keys.dimensions.getX()),
                                        record.get(keys.dimensions.getY()), record.get(keys.pixel)));
        result->setCtr(record.get(keys.center));
        return result;
    }

    explicit Factory(std::string const& name) : afw::table::io::PersistableFactory(name) {}
};

namespace {

std::string getDeltaFunctionKernelPersistenceName() { return "DeltaFunctionKernel"; }

DeltaFunctionKernel::Factory registration(getDeltaFunctionKernelPersistenceName());

}  // namespace

std::string DeltaFunctionKernel::getPersistenceName() const {
    return getDeltaFunctionKernelPersistenceName();
}

void DeltaFunctionKernel::write(OutputArchiveHandle& handle) const {
    DeltaFunctionKernelPersistenceHelper const& keys = DeltaFunctionKernelPersistenceHelper::get();
    std::shared_ptr<afw::table::BaseRecord> record = keys.write(handle, *this);
    record->set(keys.pixel, _pixel);
}
}  // namespace math
}  // namespace afw
}  // namespace lsst