/* ----------------------------------------
Image Processing pe1.c
File Image Data Processing
Ichinoseki National College Advanced Course
------------------------------------------ */

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

main(argc,argv)
int argc;
char *argv[]; 
{
	static int  i,j,m,n;
	static int pixel,line;
	static double a,b,x,y;
	static int g[1000*1000*3];
	FILE *fp1,*fp2;/*fp1は入力、fp2は出力*/

	/* Command parameter check  */
	if (argc!=7){
		printf("Usage : command input_file pixel line A B output_file\n");
		return 1;
	}

	/* Image size parameter load */
	sscanf(argv[2],"%d",&pixel);
	sscanf(argv[3],"%d",&line);
	sscanf(argv[4],"%lf",&a);
	sscanf(argv[5],"%lf",&b);/**/

	
	if (pixel*line >= 3000000){
		printf("Too big image size\n");
		return 1;
	}

	/* Input image file check */
	if (( fp1=fopen(argv[1],"r") )==NULL){
		printf("Can't open input_file\n");
		return 1;
	}

	/* Output image file check */
	if (( fp2=fopen(argv[6],"w") )==NULL){
		printf("Can't open output_file\n");
		return 1;
	}

	/* Skip header data of Input Image */
	fseek(fp1,60,0);

	/* Load Color Image Data from Input File to Image Array */
	for (j=0; j<line; j++)
	{
	for (i=0; i<pixel; i++)
	{
		/*red*/
		m=(int)(a*(double)getc(fp1)+b);
		m=(m>255)? 255:m;
		m=(m<0)? 0:m;
		g[3*(j*pixel+i)+0]=m;
		
		/*green*/
		m=(int)(a*(double)getc(fp1)+b);
		m=(m>255)? 255:m;
		m=(m<0)? 0:m;
		g[3*(j*pixel+i)+1]=m;
		
		/*blue*/
		m=(int)(a*(double)getc(fp1)+b);
		m=(m>255)? 255:m;
		m=(m<0)? 0:m;
		g[3*(j*pixel+i)+2]=m;
		
	}
	}

	/* ppm header output */
	fprintf(fp2,"P6\n");
	fprintf(fp2,"# INCT\n");
	fprintf(fp2,"%s %s\n",argv[2],argv[3]);
	fprintf(fp2,"255\n");

	/* Output from Image Array to Image file */
	for (j=0; j<line; j++)
	{
	for (i=0; i<pixel; i++)
	{
		putc(g[3*(j*pixel+i)+0],fp2);
		putc(g[3*(j*pixel+i)+1],fp2);
		putc(g[3*(j*pixel+i)+2],fp2);
	}
	}

	fclose(fp1);
	fclose(fp2);
	return 0;
}