itkBMPImageIO.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 itkBMPImageIO_h
#define itkBMPImageIO_h
#include "ITKIOBMPExport.h"


#include <fstream>
#include "itkImageIOBase.h"
#include <cstdio>
#include "itkRGBPixel.h"

namespace itk
{
class ITKIOBMP_EXPORT BMPImageIO:public ImageIOBase
{
public:
  ITK_DISALLOW_COPY_AND_ASSIGN(BMPImageIO);

  using Self = BMPImageIO;
  using Superclass = ImageIOBase;
  using Pointer = SmartPointer< Self >;

  using RGBPixelType = RGBPixel< unsigned char >; //Palette is only unsigned char in BMP files
  using PaletteType = std::vector< RGBPixelType >;

  itkNewMacro(Self);

  itkTypeMacro(BMPImageIO, Superclass);

  itkGetConstMacro(FileLowerLeft, bool);

  itkGetConstMacro(BMPCompression, long);

  itkGetConstReferenceMacro(ColorPalette, PaletteType);

  /*-------- This part of the interfaces deals with reading data. ----- */

  bool CanReadFile(const char *) override;

  void ReadImageInformation() override;

  void Read(void *buffer) override;

  /*-------- This part of the interfaces deals with writing data. ----- */

  bool CanWriteFile(const char *) override;

  void WriteImageInformation() override;

  void Write(const void *buffer) override;

  BMPImageIO();
  ~BMPImageIO() override;
  void PrintSelf(std::ostream & os, Indent indent) const override;

private:
  void SwapBytesIfNecessary(void *buffer, SizeValueType numberOfPixels);

  void Write32BitsInteger(unsigned int value);

  void Write16BitsInteger(unsigned short value);

  RGBPixelType GetColorPaletteEntry(const unsigned char entry) const;

  std::ifstream               m_Ifstream;
  std::ofstream               m_Ofstream;
  long                        m_BitMapOffset{ 0 };
  bool                        m_FileLowerLeft{ false };
  short                       m_Depth{ 8 };
  unsigned short              m_NumberOfColors{ 0 };
  unsigned int                m_ColorPaletteSize{ 0 };
  long                        m_BMPCompression{ 0 };
  unsigned long               m_BMPDataSize{ 0 };
  PaletteType                 m_ColorPalette;
};
} // end namespace itk

#endif // itkBMPImageIO_h