piskel/js/utils/ImageResizer.js

(function () {
  var ns = $.namespace('pskl.utils');

  ns.ImageResizer = {
    resize : function (image, targetWidth, targetHeight, smoothingEnabled) {
      var canvas = pskl.CanvasUtils.createCanvas(targetWidth, targetHeight);
      var context = canvas.getContext('2d');
      context.save();

      if (!smoothingEnabled) {
        this.disableSmoothingOnContext(context);
      }

      context.translate(canvas.width / 2, canvas.height / 2);
      context.scale(targetWidth / image.width, targetHeight / image.height);
      context.drawImage(image, -image.width / 2, -image.height / 2);
      context.restore();

      return canvas;
    },

    disableSmoothingOnContext : function (context) {
      context.imageSmoothingEnabled = false;
      context.mozImageSmoothingEnabled = false;
      context.oImageSmoothingEnabled = false;
      context.webkitImageSmoothingEnabled = false;
      context.msImageSmoothingEnabled = false;
    }
  };
})();