limby-resize.js

/* 
 * MIT License
 *  You may use this code as long as you retain this notice.  Use at your own risk! :)
 *  https://github.com/danschumann/limby-resize
 */
(function(){
  var _     = require('underscore');
  var debug = require('debug')('limbyResizer');

  var LimbyResizer;
  LimbyResizer = function(config) {

    if (!(this instanceof LimbyResizer)) return new LimbyResizer(config);

    debug('constructor');

    // Disable if they didn't configure a image resizing module to use
    if (!config.imagemagick && !config.canvas)
      throw new Error("You must initialize limby-resizer with config.(canvas|imagemagick) = require('canvas|imagemagick')");

    this.config = config;

    if (config.imagemagick)
      require('./lib/imagemagick')(this);
    else
      require('./lib/canvas')(this);

  };

  LimbyResizer.prototype.resize = function(filePath, options){

    var width, height;
    width = options && options.width || this.config.width;
    height = options && options.height || this.config.height;

    if (width && !height) 
      throw new Error('If you specify width, you must also specify height');
    if (!width && height)
      throw new Error('If you specify height, you must also specify width');

    return this._resize(filePath, _.extend(_.clone(options), {width: width, height: height}));
    
  };

  module.exports = LimbyResizer;

})();