vtkCaptureScreen.h

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/*=========================================================================
 *
 *  Copyright Insight Software Consortium
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0.txt
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 *=========================================================================*/

#ifndef __vtkCaptureScreen_h
#define __vtkCaptureScreen_h

#include <string>
#include "vtkSmartPointer.h"
#include "vtkWindowToImageFilter.h"
#include "vtkRenderWindow.h"

template < typename TImageWriter >
class vtkCaptureScreen
  {
public:
  using ImageWriterType = TImageWriter;

  vtkCaptureScreen( vtkRenderWindow* iRenderer ) : m_Renderer ( iRenderer )
    {}

  vtkCaptureScreen() : m_Renderer( nullptr )
    {}

  ~vtkCaptureScreen( )
    {}

  void operator( ) ( const std::string& iFileName ) const
    {
    Capture( m_Renderer, iFileName );
    }

  void operator( ) ( vtkRenderWindow* iRenderer,
                     const std::string& iFileName ) const
    {
    m_Renderer = iRenderer;
    Capture( m_Renderer, iFileName );
    }

  private:
    vtkCaptureScreen ( const vtkCaptureScreen& );
    void operator = ( const vtkCaptureScreen& );

    vtkRenderWindow* m_Renderer;

    void Capture( vtkRenderWindow* iRenderer,
                  const std::string& iFileName ) const
      {
      if( iRenderer )
        {
        vtkSmartPointer< vtkWindowToImageFilter > Dumper =
            vtkSmartPointer< vtkWindowToImageFilter >::New( );
        Dumper->SetInput( iRenderer );
        Dumper->Update( );

        vtkSmartPointer< ImageWriterType > writer =
            vtkSmartPointer< ImageWriterType >::New( );
        writer->SetFileName ( iFileName.c_str( ) );
        writer->SetInputConnection ( Dumper->GetOutputPort( ) );
        writer->Write( );
        }
      }
  };

#endif