vtkPNGReader.h

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/*=========================================================================

  Program:   Visualization Toolkit
  Module:    vtkPNGReader.h

  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notice for more information.

=========================================================================*/
#ifndef vtkPNGReader_h
#define vtkPNGReader_h

#include "vtkIOImageModule.h" // For export macro
#include "vtkImageReader2.h"

class VTKIOIMAGE_EXPORT vtkPNGReader : public vtkImageReader2
{
public:
  static vtkPNGReader *New();
  vtkTypeMacro(vtkPNGReader,vtkImageReader2);
  void PrintSelf(ostream& os, vtkIndent indent) override;

  int CanReadFile(const char* fname) override;

  const char* GetFileExtensions() override
  {
      return ".png";
  }

  const char* GetDescriptiveName() override
  {
      return "PNG";
  }

  void GetTextChunks(const char* key, int beginEndIndex[2]);
  const char* GetTextKey(int index);
  const char* GetTextValue(int index);
  size_t GetNumberOfTextChunks();


  vtkSetMacro(ReadSpacingFromFile, bool);
  vtkGetMacro(ReadSpacingFromFile, bool);
  vtkBooleanMacro(ReadSpacingFromFile, bool);
protected:
  vtkPNGReader();
  ~vtkPNGReader() override;

  void ExecuteInformation() override;
  void ExecuteDataWithInformation(vtkDataObject *out, vtkInformation *outInfo) override;
  template <class OT>
    void vtkPNGReaderUpdate(vtkImageData *data, OT *outPtr);
  template <class OT>
    void vtkPNGReaderUpdate2(
      OT *outPtr, int *outExt, vtkIdType *outInc, long pixSize);


private:
  vtkPNGReader(const vtkPNGReader&) = delete;
  void operator=(const vtkPNGReader&) = delete;

  class vtkInternals;
  vtkInternals* Internals;
  bool ReadSpacingFromFile;
};
#endif