itkBMPImageIO.h

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/*=========================================================================
 *
 *  Copyright NumFOCUS
 *
 *  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
 *
 *         https://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_MOVE(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);

  itkOverrideGetNameOfClassMacro(BMPImageIO);

  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