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#include "precomp.hpp"
#include <limits>

namespace cv
{

/****************************************************************************************\
*                                 DescriptorExtractor                                    *
\****************************************************************************************/
/*
 *   DescriptorExtractor
 */
DescriptorExtractor::~DescriptorExtractor()
{}

void DescriptorExtractor::compute( InputArray image, std::vector<KeyPoint>& keypoints, OutputArray descriptors ) const
{
    if( image.empty() || keypoints.empty() )
    {
        descriptors.release();
        return;
    }

    KeyPointsFilter::runByImageBorder( keypoints, image.size(), 0 );
    KeyPointsFilter::runByKeypointSize( keypoints, std::numeric_limits<float>::epsilon() );

    computeImpl( image, keypoints, descriptors );
}

void DescriptorExtractor::compute( InputArrayOfArrays _imageCollection, std::vector<std::vector<KeyPoint> >& pointCollection, OutputArrayOfArrays _descCollection ) const
{
    std::vector<Mat> imageCollection, descCollection;
    _imageCollection.getMatVector(imageCollection);
    _descCollection.getMatVector(descCollection);
    CV_Assert( imageCollection.size() == pointCollection.size() );
    descCollection.resize( imageCollection.size() );
    for( size_t i = 0; i < imageCollection.size(); i++ )
        compute( imageCollection[i], pointCollection[i], descCollection[i] );
}

/*void DescriptorExtractor::read( const FileNode& )
{}

void DescriptorExtractor::write( FileStorage& ) const
{}*/

bool DescriptorExtractor::empty() const
{
    return false;
}

void DescriptorExtractor::removeBorderKeypoints( std::vector<KeyPoint>& keypoints,
                                                 Size imageSize, int borderSize )
{
    KeyPointsFilter::runByImageBorder( keypoints, imageSize, borderSize );
}

Ptr<DescriptorExtractor> DescriptorExtractor::create(const String& descriptorExtractorType)
{
    return Algorithm::create<DescriptorExtractor>("Feature2D." + descriptorExtractorType);
}


CV_WRAP void Feature2D::compute( InputArray image, CV_OUT CV_IN_OUT std::vector<KeyPoint>& keypoints, OutputArray descriptors ) const
{
   DescriptorExtractor::compute(image, keypoints, descriptors);
}

}