BWconversion/RGB2Gray.cpp

The example shows how to use the operation from the examples BWconversion/BWconversion.hpp and BWconversion/BWconversion.cpp

/*
 *  Copyright 2011, 2012 Lukas Jirkovsky
 *
 *  This file is part of FotoSHOCK.
 *
 *  FotoSHOCK is free software: you can redistribute it and/or modify it
 *  under the terms of the GNU Lesser General Public License as published by
 *  the Free Software Foundation, version 3 of the License.
 *
 *  FotoSHOCK 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 Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public License
 *  along with FotoSHOCK.  If not, see <http://www.gnu.org/licenses/>.
 */

// Defines GraphManager and GraphNode classes.
#include <GraphManager.hpp>
// Contains definition if the saveImage function.
#include <IO/ImageIO.hpp>
// The operation.
#include "BWconversion.hpp"
#include "rootops/RootLoadImage.hpp"

#include <iostream>

int main(int argc, const char* argv[]) {
    if (argc != 3) {
        std::cerr << "Usage:" << std::endl
                  << "input output" << std::endl;
        return 1;
    }

    // GraphManager which represents graph.
    GraphManager graph;

    // Create a new root in graph and load image into it.
    RootLoadImageDescriptor loaderOp(argv[1]);
    GraphNode* root = graph.insertOperation(&loaderOp);

    // Insert a new operation into the graph.
    // The returned GraphNode can be used to work with the operation.
    BWconversionDescr description;
    GraphNode* op = graph.insertOperation(&description, root, NULL, NULL);

    // Confirm the operation.
    // It means that the operation will not change and the cache can be cleaned up.
    // In this case this is not useful, but with larger graphs it should be called to
    // lower the memory requirements.
    op->confirmOperation();

    // Request the rectangle to be redrawn.
    // The rectangle used has the dimenesions of the whole image.
    // The image is redrawn immediatelly.
    op->addROI(0, 0, op->getBuffer()->getWidth(), op->getBuffer()->getHeight(), 0);

    // because the operations is carried out in a separate thread, we must for the
    // thread to finish
    graph.join();

    // Print the time necessary to apply the operation
    std::cout << "Time elapsed: " << op->getElapsedTime() << std::endl;

    // Request recalculate of the operation "op" and all dependend operations.
    // In this case it is not useful, because the redraw has been done when addROI()
    // was called.
    // It is useful when the operation parameters change and it is necessary to recalculate
    // the image.
    //op->recalculate();

    // Create an ImageInfo object which will be used to describe the parameters of the stored image
    // In this case it is the same as loadInfo object, only with a different name.
    IO::SaveInfo saveInfo(argv[2]);

    // Save the buffer according to saveInfo.
    op->saveBuffer(saveInfo);

    return 0;
}