Image.h

// Copyright (c) 2014 Angus H. (4148)
// Distributed under the GNU General Public License v3.0 (GPLv3).

// header file for Image.cpp

#ifndef IMAGE_CLS
#define IMAGE_CLS

#include <windows.h>
#include <iostream>
#include "Pixel.h"
using namespace std;

class Image {
private:
	// indicates orientation of image; e.g., if BOTTOM_UP, scanline begins at bottom row of image
	// In Windows, device-independent bitmaps (DIBs) can be placed in memory in two different
	// orientations - bottom-up and top-down. In a bottom-up orientation, the buffer that holds 
	// the image data begins first with the bottom-left pixel of the image, and then ends with 
	// the upper-right pixel; each row of pixels in the image is stored in the buffer from left
	// to right, starting with the bottom row. A top-down orientation is the converse of bottom-up: 
	// each row of pixels in the image is stored in the buffer from left to right, starting with the top row.
	// default ORIENTATION: BOTTOM_UP
	int orientation; // initialized in constructor's initialization list
	// holds internal BITMAP, which contains BMBITS, the bits of the pixels of the image
	BITMAP BMP;
public:
	// function for approximating equality (approximation set by SED_LIMIT)
	bool equals(int, int, const Image&, int sed_limit=0);
	// public constants
	static const int BOTTOM_UP = 0;
	static const int TOP_DOWN = 1;
	// constructors
	Image() : orientation(BOTTOM_UP) {}; // default constructor initializes ORIENTATION only
	Image(HBITMAP, const int orientation = BOTTOM_UP);
	Image(const BITMAP&, const int orientation = BOTTOM_UP);
	// setter and getter
	const Pixel getPixel(int, int) const;
	int width() const;
	int height() const;
	bool setBMP(HBITMAP);
	void setBMP(BITMAP&);
	// overloads assignment operator for Images
	Image& operator=(const Image&);
};

#endif