rgbpixmap.h

file code.zip are used to implement ray tracing technology.

#ifndef _RGBPIXMAP
#define _RGBPIXMAP
#include <windows.h>
#include <assert.h>

#include <string>
#include <iostream>
#include <fstream>
#include <strstream>
using namespace std;

#include <gl/gl.h>
#include <gl/glu.h>
#include <gl/glut.h>
#include "common.h"
#include "shapes.h"
typedef unsigned char  uchar;
typedef unsigned short ushort;
typedef unsigned long  ulong;
//$$$$$$$$$$$$$$$$$$$ class IntPoint $$$$$$$$$$$$$$

//$$$$$$$$$$$$$$$$$$ class mRGB $$$$$$$$$$$$$$$$$$
class mRGB{ // the name RGB is reserved in windows
public: uchar r,g,b;
		  mRGB(){r = g = b = 0;}
		  mRGB(mRGB& p){r = p.r; g = p.g; b = p.b;}
		  mRGB(uchar rr, uchar gg, uchar bb){r = rr; g = gg; b = bb;}
		  void set(uchar rr, uchar gg, uchar bb){r = rr; g = gg; b = bb;}
};
//$$$$$$$$$$$$$$$$$ RGBPixmap $$$$$$$$$$$$$$$
class RGBpixmap{
private: 
	mRGB* pixel; // array of pixels
	GeomObj* obj;
public:
	int nRows, nCols; // dimensions of the pixmap
	int p;
	RGBpixmap() {nRows = nCols = 0; pixel = 0;}
	RGBpixmap(int rows, int cols) //constructor
	{
		nRows = rows;
		nCols = cols;
		pixel = new mRGB[rows*cols]; 
	}
	int readBMPFile(string fname); // read BMP file into this pixmap
	int writeBMPFile(string fname); // write this pixmap to a BMP file
	void setTexture(GLuint textureID);
	void getObj(GeomObj* o){obj=o;};
	void freeIt() // give back memory for this pixmap
	{
		delete []pixel;
		nRows = nCols = 0;
	}
	//<<<<<<<<<<<<<<<<<< copy >>>>>>>>>>>>>>>>>>>
	void copy(IntPoint from, IntPoint to, int x, int y, int width, int height)
	{ // copy a region of the display back onto the display
		if(nRows == 0 || nCols == 0) return;
		glCopyPixels(x, y, width, height,GL_COLOR);
	}
	//<<<<<<<<<<<<<<<<<<< draw >>>>>>>>>>>>>>>>>
	void draw()
	{ // draw this pixmap at current raster position
		if(nRows == 0 || nCols == 0) return;
		//tell OpenGL NOT to try to align pixels to 4 byte boundaries in memory
		glPixelStorei(GL_UNPACK_ALIGNMENT,1);
		glDrawPixels(nCols, nRows,GL_RGB, GL_UNSIGNED_BYTE,pixel);
	}
	//<<<<<<<<<<<<<<<<< read >>>>>>>>>>>>>>>>
	int read(int x, int y, int wid, int ht)
	{ // read a rectangle of pixels into this pixmap
		nRows = ht;
		nCols = wid;
		pixel = new mRGB[nRows *nCols]; if(!pixel) return -1;
		//tell OpenGL NOT to try to align pixels to 4 byte boundaries in memory
		glPixelStorei(GL_PACK_ALIGNMENT,1);
		glReadPixels(x, y, nCols, nRows, GL_RGB,GL_UNSIGNED_BYTE,pixel);
		return 0;
	}
	//<<<<<<<<<<<<<<<<< read from IntRect >>>>>>>>>>>>>>>>
	int read(IntRect r)
	{ // read a rectangle of pixels into this pixmap
		nRows = r.t - r.b;
		nCols = r.r - r.l;
		pixel = new mRGB[nRows *nCols]; if(!pixel) return -1;
		//tell OpenGL NOT to try to align pixels to 4 byte boundaries in memory
		glPixelStorei(GL_PACK_ALIGNMENT,1);
		glReadPixels(r.l,r.b, nCols, nRows, GL_RGB,GL_UNSIGNED_BYTE,pixel);
		return 0;
	}
	//<<<<<<<<<<<<<< setPixel >>>>>>>>>>>>>
	void setPixel(int x, int y, mRGB color)
	{
		if(x>=0 && x <nCols && y >=0 && y < nRows)
			pixel[nCols * y + x] = color;
	}
	//<<<<<<<<<<<<<<<< getPixel >>>>>>>>>>>
	mRGB getPixel(int x, int y)
	{
		mRGB bad(255,255,255);
		if(x < 0 || x >= nCols || y < 0 || y >= nRows)
		{
			cout << "\nx,y = " << x << "," << y << " bad in getPixel()";
			return bad;
		}
		return pixel[nCols * y + x];
	}
}; //end of class RGBpixmap
#endif