Image.hh

#ifndef Image_hh
#define Image_hh

#include <string>
using std::string;

#include "Color.hh"

// TODO:
// -- Learn this class
// -- More file formats?
// -- Image reader (for background, materials, etc)


class Image
{
public:
   Image(unsigned int xres_, unsigned int yres_);
   ~Image();

   unsigned int GetXRes() const { return xres; }
   unsigned int GetYRes() const { return yres; }
   float Aspect() const { return static_cast<float>(xres)/yres; }
   void Set(unsigned int x, unsigned int y, const Color& c) { pixels[y][x] = c; }

   void WritePPM(const string& fname) const;
   void WriteBMP(const string& fname) const;

private:
   unsigned int xres;
   unsigned int yres;
   Color** pixels;

   Image(const Image&);
   Image& operator=(const Image&);

   void writeLittleEndian(unsigned long int num, ostream& out, int numBytes) const;

   static const int BITS_PER_BYTE           = 8;   //number of bits per byte
   static const int MAX_BYTE_VALUE          = 256; //the max value a byte can hold
   static const int BMP_HEADER_SIZE         = 54;  //the total size of the header data in a BMP imgae
   static const int BMP_BYTES_PER_COLOR     = 3;   //number of bytes used for each pixel of data
   static const int BMP_PARTIAL_HEADER_SIZE = 40;  //size of the secondary header in a BMP image
   static const int BMP_NUM_OF_PLANES       = 1;   //the number of layers in a BMP
   static const int BMP_COMPRESSION         = 0;   //the compression to be used in a BMP
};

#endif // rt361_Image_h