#ifndef INCLUDE_IMAGE_H
#define INCLUDE_IMAGE_H

#include <stdio.h>

#define max(a, b) (((a)>(b))?(a):(b))
#define min(a, b) (((a)<(b))?(a):(b))

const double PI = 3.1415926535;

typedef int ImageDatum;
#define dataToDouble(a) (double(a)/255.0)
#define doubleToData(b) (ImageDatum(b*255.0))

union Pixel {
	struct RGB_Pixel {
		ImageDatum r;
		ImageDatum g;
		ImageDatum b;
	} rgb;
	
	struct HSI_Pixel {
		ImageDatum h;
		ImageDatum s;
		ImageDatum i;
	} hsi;
};

enum ImageMode {
	Mode_RGB,
	Mode_HSI
};

enum ImageChannel {
	ch_Red, 
	ch_Blue,
	ch_Green,
	ch_Hue,
	ch_Saturation,
	ch_Intensity
};

class ImageDisplayer;

class Image {
 public:
 	Image(int, int);
 	Image(char*);
	Image(Image&);
	~Image();
	bool load(char*);
	bool save(char*);
	void display(char*);
	void annotate(char*, char*);
 	ImageDatum getValue(ImageChannel, int, int);
	void setValue(ImageChannel, int, int, ImageDatum);
 	bool isBlack(int, int);
 	bool isWhite(int, int);
	ImageDatum getGrey(int, int);
	void settoBlack(int, int);
	void settoWhite(int, int);
	void setGrey(int, int, ImageDatum);
	int height();
	int width();
	void RGBtoHSI();
	void swap(Image* that);
	
	// for internal use - not for the faint of heart
	void write_to_fp(FILE*);
	void read_from_fp(FILE*);

 	static bool showGUI;
	static long memReq;

 protected:
 	void init(int, int);
 	int h, w;
	ImageMode mode;
	Pixel* p;
	Pixel* getPixel(int, int);
	
	void openGUI();
	void loadRGB(char*,int,int);
	void saveRGB(char*);
	static FILE* guiRead;
	static FILE* guiWrite;
};


#endif