problem displaying a bitmap width not divisible by 4

[swetha.bsharma]

Hello,


I am trying to display a bitmap truecolor image with a width not divisible by 4.

#include <iostream.h>
#include <stdio.h>
#include<stdlib.h>

class ImageBMP
{
public:
 int Height;
 int Width;
 unsigned char *Rinputimage;
 unsigned char *Ginputimage;
 unsigned char *Binputimage;
 unsigned char *Yimage;
 unsigned char *Cbimage;
 unsigned char *Crimage;
 ~ImageBMP();
 void getimageinfo(FILE*);
 void rgb2ycbcr();
 void displayycbcrimage(FILE*);

};

ImageBMP::~ImageBMP()
{
	delete[]Rinputimage;
	delete[]Ginputimage;
	delete[]Binputimage;
	delete[]Yimage;
	delete[]Cbimage;
	delete[]Crimage;

}
***************************************************
Reading the image and getting the R,G,B values
***************************************************

void ImageBMP::getimageinfo(FILE* fptr)
{
	int fpos , size,fileindex=0,len,rem;
	fseek(fptr,18,SEEK_SET);

	fpos= ftell(fptr);
    fread(&Width,1,4,fptr);
    cout<<"The  Width is"<<Width<<endl;
	fpos = ftell(fptr);
	fread(&Height,1,4,fptr);
	cout<<"The Height is "<<Height<<endl;

	fseek(fptr,28,SEEK_CUR);
	fpos=ftell(fptr);
     
	size = Height*Width;

	

	Rinputimage = new unsigned char[size];
	Ginputimage = new unsigned char[size];
	Binputimage = new unsigned char[size];

	while(fileindex<size)
	{
		fread((Binputimage+fileindex),1,1,fptr);
		fpos=ftell(fptr);
    	fread((Ginputimage+fileindex),1,1,fptr);
		fread((Rinputimage+fileindex),1,1,fptr);
		fileindex++;

	}

  fpos=ftell(fptr);

}

**********************************************
Conversion to RGB  to ycbcr
**********************************************
void ImageBMP::rgb2ycbcr()
{
	int size,fileindex;
	size = Height*Width;

	Yimage  = new unsigned char[size];
	Cbimage = new unsigned char[size];
	Crimage = new unsigned char[size];

    for(fileindex=0;fileindex<size;fileindex++)
	{
		Yimage[fileindex]= (0.257 *Rinputimage[fileindex]+0.504*Ginputimage[fileindex]+0.098*Binputimage[fileindex]+16);
		Cbimage[fileindex]= (-0.148*Rinputimage[fileindex]-0.291*Ginputimage[fileindex]+0.439*Binputimage[fileindex]+128);
		Crimage[fileindex]= (0.439*Rinputimage[fileindex]-0.368*Ginputimage[fileindex]-0.071*Binputimage[fileindex]+128);
	}
    

}

**********************************************
display the image in ycbcr format
**********************************************
void ImageBMP::displayycbcrimage(FILE* fptr)
{
	int size,fpos,rem=0,row,col,ycbcrindex,addwidth,index,componentsize,filesize;
	char *buffer;
	unsigned char ycbcr;

	FILE *fout = fopen("out.bmp","wb");

;

	fseek(fptr,0,SEEK_SET);
	buffer = new char[1];
*************************************
Reading and writing  the header.
*************************************
	for (index=0;index<54;index++)
	{
		fread(buffer,1,1,fptr);
		fwrite(buffer,1,1,fout);
		
	}

    fpos=ftell(fout);
****************************
Checking for divisibility by 4.
****************************
	if((Width)%4!=0)
	{
		rem=4-((Width)%4);
	}

	if(rem!=0)
	{
		size=Height*Width*3+Width*rem;
	}
	else
	{
		size=Height*Width*3;
	}

	//ycbcr = new unsigned char[1];
	ycbcrindex=0;

	componentsize=Height*Width;
	
   	  for (index=0;index<componentsize;index++) 
	   {

			ycbcr=Crimage[index];
			fwrite(&ycbcr,1,1,fout);
			ycbcr=Cbimage[index];
			fwrite(&ycbcr,1,1,fout);
			ycbcr=Yimage[index];
			fwrite(&ycbcr,1,1,fout);
			
	   }

      if(rem!=0)
	{
		addwidth=1;

		while(addwidth<=rem*Height)
		{
			ycbcr=0;
			fwrite(&ycbcr,1,1,fout);
			addwidth++;

		}

	}

  
  fpos=ftell(fout);
  fclose(fout);

//	delete[]ycbcr;

}
void main()
{
	FILE *fp = fopen("D:\\images\\images\\gun.bmp","rb");

	

	ImageBMP testimage;

	testimage.getimageinfo(fp);
	testimage.rgb2ycbcr();
	testimage.displayycbcrimage(fp);

	fclose(fp);
}

The image is displayed with scanlines. I do not know where the mistake is,can someone help me?
-swetha