free-tex-packer-core/filters/Grayscale.js

Free texture packer core

let Filter = require('./Filter');

class Grayscale extends Filter {
    constructor() {
        super();
    }
    
    apply(image) {
        let imageData = image.bitmap;
        
        for(let i=0; i<imageData.data.length; i+=4) {
            let v = 0.2126*imageData.data[i] + 0.7152*imageData.data[i+1] + 0.0722*imageData.data[i+2];
            imageData.data[i] = v;
            imageData.data[i + 1] = v;
            imageData.data[i + 2] = v;
        }
        
        return image;
    }

    static get type() {
        return "grayscale";
    }
}

module.exports = Grayscale;