Thread: Bitmasking Problem

I'm making a set of functions to produce console-like output for SDL. The font is made from a binary mask but I am having problems getting it to display properly. Heres an example of it printing the string"0123456789ABCDE" :
http://i92.photobucket.com/albums/l1...l/deleteme.png

Its partly readable but somethings definitely wrong. The constructor for the class takes a character map, and the data. This is run here in my prog:

Code:

BitText txt(	"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ", 
				"mprtxpmckccccmmp`acg~mp`e`pmaeiq~aa~oom`pmego}ppm~``acgomppmppmmppn`ak"
				"cipp~pp}pp}pp}mpooopm}ppppp}~oo}oo~~oo}ooompoorpnppp~pppmcccccm~aaaqqk"
				"pqswsqpoooooo~pztppppppxtrppmpppppm}pp}ooomppptrn}pp}sqpmpom`pm~cccccc"
				"ppppppmpppppicppppttippicipppppiccc~`acgo~" );

Heres what the constructor does with it:

Code:

BitText::BitText(const char* char_map, const char* char_data)
{
	int len = (int)strlen(char_map);
	map = new char[len];
	strcpy(map, char_map);
	len = (int)strlen(char_data);
	data = new char[len];
	strcpy(data, char_data); 
	col = 0xFFFFFFFF;
}

And heres the function to print text to the screen:

Code:

void BitText::Print(Uint16 x_pos, Uint16 y_pos, const char* text)
{
	int x, y, bit, pos;
	char* ptr;

	for(int i=0; i<(int)strlen(text); i++)
	{
		//Get the coresponding character in the character map
		for(ptr=map, pos=0; *ptr; ptr++, pos++)
			if(*ptr == text[i]) break;

		//Get the characters data start point
		ptr = data +(pos*7);
		
		//Draw character
		for(y=0; y<7; y++)
		{		
			bit=16;
			for(x=0; x<5; x++, bit >>= 1)
				if(*ptr & bit) 
					WritePixel(x_pos+x, y_pos+y, this->col);	 
			ptr++; //Move to data byte holding next scanline of the character	
		}

		x_pos+=6;
	}
}

I'm pretty sure the mistake is in this last function. Can someone see whats going wrong here? I can't Hopefully thats all the relevant code here.