checker.c

#include <string.h>
#include <stdlib.h>
#include "ppm.h"


// Compute the final image
int testImage(PPMImage *compare, PPMImage *correct) {
	
	int counDiffA[1024];
	for(int i = 0; i < 1024; i++) {
		counDiffA[i] = 0;
	}
	int *counDiff = &counDiffA[512];
	
	if(correct->x * correct->y != compare->x * compare->y) {
		return -1;
	}
	
	for(int i = 0; i < correct->x * correct->y; i++) {
	    int rdiff = (int)(compare->data[i].red - correct->data[i].red);
	    int gdiff = (int)(compare->data[i].green - correct->data[i].green);
	    int bdiff = (int)(compare->data[i].blue - correct->data[i].blue);
		counDiff[rdiff]++;
		counDiff[gdiff]++;
		counDiff[bdiff]++;
        correct->data[i].red = correct->data[i].green = correct->data[i].blue = 0;
		if(rdiff || gdiff || bdiff){
            correct->data[i].red = 255;
        }
	}
	
	int requiredCorrect = correct->x * correct->y * 3;
	int correctPixels = counDiff[0];
	printf("Correct pixles: %d\n", correctPixels);
	
	
	int singleErrors = counDiffA[512-1] + counDiffA[512+1];
	printf("Pixles, single errors: %d\n", singleErrors);
    if(singleErrors > 2000) {
        printf("Too many single errors!\n");
    }

	
	int multiErrors = requiredCorrect - (correctPixels + singleErrors);
	printf("Pixles, multiple errors: %d\n", multiErrors);
	return 0;
}


int main(int argc , char ** argv){
	
	PPMImage *imageTinyCorrect;
	imageTinyCorrect = readPPM("flower_tiny_correct.ppm");
	PPMImage *imageSmallCorrect;
	imageSmallCorrect = readPPM("flower_small_correct.ppm");
	PPMImage *imageMediumCorrect;
	imageMediumCorrect = readPPM("flower_medium_correct.ppm");
	
	PPMImage *imageTiny;
	imageTiny = readPPM("flower_tiny.ppm");
	PPMImage *imageSmall;
	imageSmall = readPPM("flower_small.ppm");
	PPMImage *imageMedium;
	imageMedium = readPPM("flower_medium.ppm");


	
	printf("flower_tiny.ppm:\n");
	int pass = testImage(imageTiny, imageTinyCorrect);
	writePPM("flower_tiny_errors.ppm", imageTinyCorrect);
	printf("flower_small.ppm:\n");
	pass = testImage(imageSmall, imageSmallCorrect);
    writePPM("flower_small_errors.ppm", imageSmallCorrect);
	printf("flower_medium.ppm:\n");
	pass = testImage(imageMedium, imageMediumCorrect);
    writePPM("flower_medium_errors.ppm", imageMediumCorrect);
	
	exit(0);
}