node-image-filter/lib/index.js

Image Filter Library for nodejs

/**
 *  Entry Point
 */
const getPixels = require('get-pixels');
const savePixels = require('save-pixels');
const renderer = require('./renderer');
const utility = require('./utility');

// renderer
module.exports.preset = renderer.preset;
module.exports.convolution = renderer.convolution;

// utility
module.exports.utility = utility;

/**
 * render using custom filters.
 * @param path
 * @param filter
 * @param options
 * @param callback
 */
module.exports.render = function (path, filter, options, callback) {

    var useOptions = (typeof options !== "function");
    var op = useOptions ? options : {};
    var cb = useOptions ? callback : options;

    var type = path.split('.').pop();  // split type

    getPixels(path, function (err, pixels) { // load image
        if (err) {
            console.log('node-image-filter', err);
            return;
        }

        var renderObject = {
            data: pixels.data,
            width: pixels.shape[0],
            height: pixels.shape[1]
        };

        pixels.data = filter(renderObject, op);

        var resultObject = {
            data: savePixels(pixels, type),
            type: type,
            width: pixels.shape[0],
            height: pixels.shape[1]
        };

        cb(resultObject);
    });
};