ColorImageRGBa8.h

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#ifndef ColorImageRGB8a_H
#define ColorImageRGB8a_H

#include "ImageSuperClasses.h"
#include "SingleElementImage.h"
#include "MultiElementImage.h"

namespace puma2 {

typedef unsigned char byte;

struct RGBa8 {
  union {
     struct {                   //< order needs to be checked
      unsigned int r:8;
      unsigned int g:8;
      unsigned int b:8;
      unsigned int a:8;
     };
     unsigned int u;  //< should be 32 bit
     byte w[4];       //< provides alternative access method
   };
   RGBa8 & operator=(const RGBa8 o) { u = o.u; return *this; }
   void operator= (int v) { u = v; }
   byte & operator[] (int i) { return w[i]; }
   byte operator[] (int i) const { return w[i]; }
   void assign(int v, int n) { w[n] = v; }
   typedef byte B4[4];
};

template <> inline void Vector<RGBa8::B4>::copy(const RGBa8::B4& f, RGBa8::B4& t)
        { t[0] = f[0];
          t[1] = f[1];
          t[2] = f[2];
          t[3] = f[3]; }
template <> inline void Vector<RGBa8>::copy(const RGBa8& f, RGBa8& t) { t.u = f.u; }

class ColorImageRGBa8 :
    public SingleElementImage<RGBa8>
{
  public:
    ColorImageRGBa8(int x = 0, int y = 0);

    ColorImageRGBa8(int x, int y, ColorImageRGBa8 * m, int xo, int yo);

    void assign(int i, int j, int n, int v);

    // ~ColorImageRGBa8() { delete alt; }
    MultiElementImage<byte,4> & asMultiElementImage();

    static int numberOfChannels();

    double getElementTypeMinimum() const { return 0; };

    double getElementTypeMaximum() const { return 255; };

    void readFromFile(const char * fileName);
    void writeToFile(const char * fileName) const;

  private:
    MultiElementImage<byte,4> alt; // alternative access
};

}

#endif