/*
* Copyright (C) 1999-2011 Insight Software Consortium
* Copyright (C) 2005-2020 Centre National d'Etudes Spatiales (CNES)
*
* This file is part of Orfeo Toolbox
*
*     https://www.orfeo-toolbox.org/
*
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*
* Unless required by applicable law or agreed to in writing, software
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
*/

//  This example should arguably be placed in the filtering
//  chapter. However its usefulness for typical IO operations makes it
//  interesting to mention here. The purpose of this example is to read and
//  image, extract a subregion and write this subregion to a file. This is a
//  common task when we want to apply a computationally intensive method to
//  the region of interest of an image.
//
//  As usual with OTB IO, we begin by including the appropriate header files.

#include "otbImageFileWriter.h"

//  The \doxygen{otb}{ExtractROI} is the filter used to extract a
//  region from an image. Its header is included below.
//

#include "otbExtractROI.h"

int main(int argc, char* argv[])
{
// Verify the number of parameters in the command line
if (argc < 7)
{
std::cerr << "Usage: " << std::endl;
std::cerr << argv[0] << " inputImageFile  outputImageFile " << std::endl;
std::cerr << " startX startY sizeX sizeY" << std::endl;
return EXIT_FAILURE;
}

//  Image types are defined below.

using InputPixelType         = unsigned char;
using OutputPixelType        = unsigned char;
const unsigned int Dimension = 2;
using InputImageType         = otb::Image<InputPixelType, Dimension>;
using OutputImageType        = otb::Image<OutputPixelType, Dimension>;

//  The types for the \doxygen{otb}{ImageFileReader} and \doxygen{otb}{ImageFileWriter}
//  are instantiated using the image types.

using WriterType = otb::ImageFileWriter<OutputImageType>;

//  The ExtractROI type is instantiated using
//  the input and output pixel types. Using the pixel types as
//  template parameters instead of the image types allows
//  restricting the use of this class to \doxygen{otb}{Image}s which
//  are used with scalar pixel types. See section
//  \ref{sec:ExtractROI} for the extraction of ROIs on
//  \doxygen{otb}{VectorImage}s. A filter object is created with the
//  New() method and assigned to a \doxygen{itk}{SmartPointer}.

using FilterType = otb::ExtractROI<InputImageType::PixelType, OutputImageType::PixelType>;

FilterType::Pointer filter = FilterType::New();

//  The ExtractROI requires a region to be
//  defined by the user. This is done by defining a rectangle with
//  the following methods (the filter assumes that a 2D image is
//  being processed, for N-D region extraction, you can use the
//  \doxygen{itk}{RegionOfInterestImageFilter} class).

filter->SetStartX(atoi(argv[3]));
filter->SetStartY(atoi(argv[4]));
filter->SetSizeX(atoi(argv[5]));
filter->SetSizeY(atoi(argv[6]));

//  Below, we create the reader and writer using the New() method and
//  assigning the result to a SmartPointer.
//
//  \index{otb::ImageFileWriter!New()}
//  \index{otb::ImageFileWriter!SmartPointer}

WriterType::Pointer writer = WriterType::New();

//
// Here we recover the file names from the command line arguments
//
const char* inputFilename  = argv[1];
const char* outputFilename = argv[2];

//  The name of the file to be read or written is passed with the
//  SetFileName() method.
//
//  \index{otb::ImageFileWriter!SetFileName()}
//  \index{SetFileName()!otb::ImageFileWriter}

writer->SetFileName(outputFilename);

//  Below we connect the reader, filter and writer to form the data
//  processing pipeline.

writer->SetInput(filter->GetOutput());

//  Finally we execute the pipeline by invoking Update() on the writer. The
//  call is placed in a \code{try/catch} block in case exceptions are
//  thrown.

try
{
writer->Update();
}
catch (itk::ExceptionObject& err)
{
std::cerr << "ExceptionObject caught !" << std::endl;
std::cerr << err << std::endl;
return EXIT_FAILURE;
}

return EXIT_SUCCESS;
}