/*  Image.cpp
 *
 *  CSE 326, Spring 2000
 *  Project 1
 *
 *  class image
 *  main
 */


#include "Image.h"

#define MAX_LINE	200
#define NUM_ARGS	3
#define OUTPUT_MAX_VALUE	255
#define USAGE	"arguments: [input_file] [output_file]\n"

int main(int argc, char **argv) {
	if(argc != NUM_ARGS) {
	  cerr << USAGE;
		exit(1);
	}
 
	// add stuff here

	return 0;
}

image::image(title tl)
{
 
}

void image::readImage(string input_file)
{
	int i, j;
	ifstream input(input_file.c_str());
	string buffer;
	char temp[MAX_LINE];
	if(input.is_open() == false){
		cerr << "The input file cannot be opened.\n";
		exit(1);
	}
	input >> buffer;
	if(buffer != "P2"){
		cerr << "The format is incorrect.\n";
		exit(1);
	}
	input >> buffer;
	while(buffer[0] == '#'){	//skip comments
		input.getline(temp, MAX_LINE, '\n');
		input >> buffer;
	}
	input >> buffer;	//skip col
	input >> buffer;	//skip max_value
		
	for(i = 0; i < row; i++)
		for(j = 0; j < col; j++)
			input >> array[i][j];
	input.close();
}


void image::convertPGM(int num_components)
{
	int i, j;
	if(num_components == 0)
		return;
	int offset = OUTPUT_MAX_VALUE / num_components;

	for(i = 0; i < row; i++)
		for(j = 0; j < col; j++)
			array[i][j] *= offset;
}


image::~image()
{
	int i;
	for(i = 0; i < row; i++)
		delete [] array[i];
}