frequency_resampler.h

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#ifndef SIRIUS_RESAMPLER_FREQUENCY_RESAMPLER_H_
#define SIRIUS_RESAMPLER_FREQUENCY_RESAMPLER_H_

#include "sirius/i_frequency_resampler.h"
#include "sirius/image.h"

#include "sirius/fftw/types.h"

namespace sirius {
namespace resampler {

template <template <class> class ImageDecompositionPolicy, class ZoomStrategy>
class FrequencyResampler final
      : public IFrequencyResampler,
        private ImageDecompositionPolicy<ZoomStrategy> {
  public:
    FrequencyResampler() = default;

    // copyable
    FrequencyResampler(const FrequencyResampler&) = default;
    FrequencyResampler& operator=(const FrequencyResampler&) = default;
    // moveable
    FrequencyResampler(FrequencyResampler&&) = default;
    FrequencyResampler& operator=(FrequencyResampler&&) = default;

    ~FrequencyResampler() override = default;

    // IFrequencyResampler interface
    Image Compute(const ZoomRatio& ratio, const Image& input,
                  const Padding& image_padding,
                  const Filter& filter = {}) const override;

  private:
    Image UnpadImage(const ZoomRatio& zoom_ratio, const Image& original_image,
                     const Image& zoomed_image, const Padding& image_padding,
                     const Filter& filter) const;

    Image DecimateImage(const Image& zoomed_image,
                        const ZoomRatio& zoom_ratio) const;
};

}  // namespace resampler
}  // namespace sirius

#include "sirius/resampler/frequency_resampler.txx"

#endif  // SIRIUS_RESAMPLER_FREQUENCY_RESAMPLER_H_