#ifndef _IMAGE_LOADER_H_
#define _IMAGE_LOADER_H_

enum EImageFileFormat {
  eFileFormat_PNG,

  kNumImageFileFormats
};

class ImageLoader {

 protected:

  unsigned int m_Width;
  unsigned int m_Height;

  unsigned int m_RedChannelPrecision;
  unsigned char *m_RedData;

  unsigned int m_GreenChannelPrecision;
  unsigned char *m_GreenData;
  
  unsigned int m_BlueChannelPrecision;
  unsigned char *m_BlueData;
 
  unsigned int m_AlphaChannelPrecision;
  unsigned char *m_AlphaData;

  const unsigned char *const m_RawData;

  ImageLoader(const unsigned char *rawData) : m_RawData(rawData)
  , m_Width(0), m_Height(0)
  , m_RedChannelPrecision(0), m_RedData(0)
  , m_GreenChannelPrecision(0), m_GreenData(0)
  , m_BlueChannelPrecision(0), m_BlueData(0)
  , m_AlphaChannelPrecision(0), m_AlphaData(0)
    { }

  virtual ~ImageLoader() {
    if(m_RedData) {
      delete [] m_RedData;
      m_RedData = 0;
    }

    if(m_GreenData) {
      delete [] m_GreenData;
      m_GreenData = 0;
    }

    if(m_BlueData) {
      delete [] m_BlueData;
      m_BlueData = 0;
    }

    if(m_AlphaData) {
      delete [] m_AlphaData;
      m_AlphaData = 0;
    }
  }

 public:
  virtual bool ReadData() = 0;

  int GetRedChannelPrecision() const { return m_RedChannelPrecision; }
  unsigned char * GetRedPixelData() const { return m_RedData; }

  int GetGreenChannelPrecision() const { return m_GreenChannelPrecision; }
  unsigned char * GetGreenPixelData() const { return m_GreenData; }

  int GetBlueChannelPrecision() const { return m_BlueChannelPrecision; }
  unsigned char * GetBluePixelData() const { return m_BlueData; }

  int GetAlphaChannelPrecision() const { return m_AlphaChannelPrecision; }
  unsigned char * GetAlphaPixelData() const { return m_AlphaData; }
};

#cmakedefine PNG_FOUND

#endif // _IMAGE_LOADER_H_