c-bmp/test.c at main · Vardan2009/c-bmp · GitHub

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

//including the library
#include "src/bmp.c"


unsigned char clamp(int value, int min, int max) {
    if (value < min)
        return (unsigned char)min;
    else if (value > max)
        return (unsigned char)max;
    else
        return (unsigned char)value;
}


//testing Bitmap library

// taking image as input and grayscaling it
void grayscale(BMPImage* img) {
    for (int y = 0; y < img->infoHeader.height; y++) {
        for (int x = 0; x < img->infoHeader.width; x++) {
            Pixel p = getPixel(img,x,y);
            unsigned char pixavg = (p.r+p.g+p.b)/3;
            // average rgb values
            p.r = pixavg;
            p.g = pixavg;
            p.b = pixavg;
            setPixel(img,x,y,p);
        }
    }
}

// taking image as input and inverting each pixel
void invert(BMPImage* img) {
    for (int y = 0; y < img->infoHeader.height; y++) {
        for (int x = 0; x < img->infoHeader.width; x++) {
            Pixel p = getPixel(img,x,y);
            // invert rgb values
            p.r = 255 - p.r;
            p.g = 255 - p.g;
            p.b = 255 - p.b;
            setPixel(img,x,y,p);
        }
    }
}

// taking image as input and decreasing blue and green channels on each pixel
void vintage(BMPImage* img) {
    for (int y = 0; y < img->infoHeader.height; y++) {
        for (int x = 0; x < img->infoHeader.width; x++) {
            Pixel p = getPixel(img, x, y);

            // decrease blue and green channels
            p.b = (unsigned char)(p.b * 0.5);
            p.g = (unsigned char)(p.g * 0.7);

            setPixel(img, x, y, p);
        }
    }
}

// taking image as input and adding random noise to each pixel
void noise(BMPImage* img,int intensity) {
    srand(time(NULL)); // random number seed

    for (int y = 0; y < img->infoHeader.height; y++) {
        for (int x = 0; x < img->infoHeader.width; x++) {
            Pixel p = getPixel(img, x, y);

            // Add random noise to each channel
            int noiseR = rand() % (intensity * 2 + 1) - intensity; // random noise between -intensity to +intensity
            int noiseG = rand() % (intensity * 2 + 1) - intensity;
            int noiseB = rand() % (intensity * 2 + 1) - intensity;

            p.r = clamp(p.r + noiseR, 0, 255); // clamp to 0-255
            p.g = clamp(p.g + noiseG, 0, 255);
            p.b = clamp(p.b + noiseB, 0, 255);

            setPixel(img, x, y, p);
        }
    }
}


int main() {
    // load image from path
    BMPImage img = readBMP("tests/0.bmp");

    // add filters defined above
    noise(&img, 100);
    grayscale(&img);
    invert(&img);
    vintage(&img);

    // writing output to a new file
    writeBMP("tests/0out.bmp", img);
}