#include<iostream>
#include<fstream>

using namespace std;

const unsigned int WIDTH = 4096;
const unsigned int HEIGHT = 4096;
const unsigned int HEADER_SIZE = 54;
const unsigned int BYTES_PER_PIXEL = 3;


void writeFileHeader(ofstream& fout)
{
	char bfType[3] = "BM";
	unsigned int bfSize = WIDTH * HEIGHT * BYTES_PER_PIXEL + HEADER_SIZE;
	unsigned short bfReserved1 = 0;
	unsigned short bfReserved2 = 0;
	unsigned int bfOffBits = HEADER_SIZE;

	fout.write(bfType, 2); // this should read BM
	fout.write((char*)&bfSize,4);
	fout.write((char*)&bfReserved1,2);
	fout.write((char*)&bfReserved2,2);
	fout.write((char*)&bfOffBits,4);
}

void writeInfoHeader(ofstream& fout)
{
	unsigned int biSize = 40;
	unsigned int biWidth = WIDTH;
	unsigned int biHeight = HEIGHT;
	unsigned short biPlanes = 1;
	unsigned short biBitCount = 24;
	unsigned int biCompression = 0;
	unsigned int biSizeImage = WIDTH * HEIGHT * BYTES_PER_PIXEL;
	unsigned int biXPelsPerMeter = 0;
	unsigned int biYPelsPerMeter = 0;
	unsigned int biClrUsed = 0;
	unsigned int biClrImportant = 0;

	fout.write((char*)&biSize,4);
	fout.write((char*)&biWidth,4);
	fout.write((char*)&biHeight,4);
	fout.write((char*)&biPlanes,2);
	fout.write((char*)&biBitCount,2);
	fout.write((char*)&biCompression,4);
	fout.write((char*)&biSizeImage,4);
	fout.write((char*)&biXPelsPerMeter,4);
	fout.write((char*)&biYPelsPerMeter,4);
	fout.write((char*)&biClrUsed,4);
	fout.write((char*)&biClrImportant,4);
}

void main()
{
	ofstream fout("junk.bmp",ios::binary);

	writeFileHeader(fout);
	writeInfoHeader(fout);

	unsigned char red = 0;
	unsigned char blue = 0;
	unsigned char green = 0;
	
	int i = 0;

	for(int r = 0; r < 256; r++)
	{
		for(int g = 0, green= 0; g < 256; g++)
		{
			for(int b = 0, blue = 0; b < 256; b++)
			{
				blue++;
				fout.write((char*)&blue, 1);
				fout.write((char*)&green, 1);
				fout.write((char*)&red, 1);

			}
			green++;
		}
		red++;
	}
	
	//for(int row = 0; row < HEIGHT; row++)
	//{
	//	for(int column = 0;column < WIDTH; column++)
	//	{
	//		red = row * 2;
	//		blue = column * 2;
	//		green++;

	//		fout.write((char*)&blue, 1);
	//		fout.write((char*)&green, 1);
	//		fout.write((char*)&red, 1);
	//		i++;
	//	}
	//	//blue = (blue == 0)?255:0;
	//	//green = (green == 0)?255:0;
	//}

	fout.close();
}