publiclab/image-sequencer

/*
* Changes the Image Brightness
*/
module.exports = function Brightness(options, UI) {

  var defaults = require('./../../util/getDefaults.js')(require('./info.json'));
  var output;



  function draw(input, callback, progressObj) {

    options.brightness = options.brightness || defaults.brightness;

    progressObj.stop(true);
    progressObj.overrideFlag = true;

    /*
        In this case progress is handled by changepixel internally otherwise progressObj
        needs to be overriden and used
        For eg. progressObj = new SomeProgressModule()
        */

    var step = this, val = (options.brightness) / 100.0;

    function changePixel(r, g, b, a) {

      r = Math.min(val * r, 255);
      g = Math.min(val * g, 255);
      b = Math.min(val * b, 255);
      return [r, g, b, a];
    }

    function output(image, datauri, mimetype, wasmSuccess) {
      step.output = { src: datauri, format: mimetype, wasmSuccess, useWasm: options.useWasm };
    }

    return require('../_nomodule/PixelManipulation.js')(input, {
      output: output,
      ui: options.step.ui, //don't pass this in if you don't want your module to support progress bars
      changePixel: changePixel,
      format: input.format,
      image: options.image,
      inBrowser: options.inBrowser,
      callback: callback,
      useWasm:options.useWasm
    });

  }
  return {
    options: options,
    draw: draw,
    output: output,
    UI: UI
  };
};