Compile image loader in v2 syntax.

ui/file_manager/image_loader/image_loader.js

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /**
  * Loads and resizes an image.
  * @constructor
  */
 function ImageLoader() {
   /**
@@ skipping 109 matching lines @@
 };
 
 /**
  * Returns the singleton instance.
  * @return {ImageLoader} ImageLoader object.
  */
 ImageLoader.getInstance = function() {
   if (!ImageLoader.instance_)
     ImageLoader.instance_ = new ImageLoader();
   return ImageLoader.instance_;
-};
-
-/**
- * Checks if the options contain any image processing.
- *
- * @param {number} width Source width.
- * @param {number} height Source height.
- * @param {Object} options Resizing options as a hash array.
- * @return {boolean} True if yes, false if not.
- */
-ImageLoader.shouldProcess = function(width, height, options) {
-  var targetDimensions = ImageLoader.resizeDimensions(width, height, options);
-
-  // Dimensions has to be adjusted.
-  if (targetDimensions.width != width || targetDimensions.height != height)
-    return true;
-
-  // Orientation has to be adjusted.
-  if (!options.orientation.isIdentity())
-    return true;
-
-  // Non-standard color space has to be converted.
-  if (options.colorSpace && options.colorSpace !== ColorSpace.SRGB)
-    return true;
-
-  // No changes required.
-  return false;
-};
-
-/**
- * Calculates dimensions taking into account resize options, such as:
- * - scale: for scaling,
- * - maxWidth, maxHeight: for maximum dimensions,
- * - width, height: for exact requested size.
- * Returns the target size as hash array with width, height properties.
- *
- * @param {number} width Source width.
- * @param {number} height Source height.
- * @param {Object} options Resizing options as a hash array.
- * @return {Object} Dimensions, eg. {width: 100, height: 50}.
- */
-ImageLoader.resizeDimensions = function(width, height, options) {
-  var scale = options.scale || 1;
-  var targetDimensions = options.orientation.getSizeAfterCancelling(
-      width * scale, height * scale);
-  var targetWidth = targetDimensions.width;
-  var targetHeight = targetDimensions.height;
-
-  if (options.maxWidth && targetWidth > options.maxWidth) {
-    var scale = options.maxWidth / targetWidth;
-    targetWidth *= scale;
-    targetHeight *= scale;
-  }
-
-  if (options.maxHeight && targetHeight > options.maxHeight) {
-    var scale = options.maxHeight / targetHeight;
-    targetWidth *= scale;
-    targetHeight *= scale;
-  }
-
-  if (options.width)
-    targetWidth = options.width;
-
-  if (options.height)
-    targetHeight = options.height;
-
-  targetWidth = Math.round(targetWidth);
-  targetHeight = Math.round(targetHeight);
-
-  return {width: targetWidth, height: targetHeight};
-};
-
-/**
- * Performs resizing and cropping of the source image into the target canvas.
- *
- * @param {HTMLCanvasElement|Image} source Source image or canvas.
- * @param {HTMLCanvasElement} target Target canvas.
- * @param {Object} options Resizing options as a hash array.
- */
-ImageLoader.resizeAndCrop = function(source, target, options) {
-  // Calculates copy parameters.
-  var copyParameters = ImageLoader.calculateCopyParameters(source, options);
-  target.width = copyParameters.canvas.width;
-  target.height = copyParameters.canvas.height;
-
-  // Apply.
-  var targetContext =
-      /** @type {CanvasRenderingContext2D} */ (target.getContext('2d'));
-  targetContext.save();
-  options.orientation.cancelImageOrientation(
-      targetContext, copyParameters.target.width, copyParameters.target.height);
-  targetContext.drawImage(
-      source,
-      copyParameters.source.x,
-      copyParameters.source.y,
-      copyParameters.source.width,
-      copyParameters.source.height,
-      copyParameters.target.x,
-      copyParameters.target.y,
-      copyParameters.target.width,
-      copyParameters.target.height);
-  targetContext.restore();
-};
-
-/**
- * @typedef {{
- *   source: {x:number, y:number, width:number, height:number},
- *   target: {x:number, y:number, width:number, height:number},
- *   canvas: {width:number, height:number}
- * }}
- */
-ImageLoader.CopyParameters;
-
-/**
- * Calculates copy parameters.
- *
- * @param {HTMLCanvasElement|Image} source Source image or canvas.
- * @param {Object} options Resizing options as a hash array.
- * @return {!ImageLoader.CopyParameters} Calculated copy parameters.
- */
-ImageLoader.calculateCopyParameters = function(source, options) {
-  if (options.crop) {
-    // When an image is cropped, target should be a fixed size square.
-    assert(options.width);
-    assert(options.height);
-    assert(options.width === options.height);
-
-    // The length of shorter edge becomes dimension of cropped area in the
-    // source.
-    var cropSourceDimension = Math.min(source.width, source.height);
-
-    return {
-      source: {
-        x: Math.floor((source.width / 2) - (cropSourceDimension / 2)),
-        y: Math.floor((source.height / 2) - (cropSourceDimension / 2)),
-        width: cropSourceDimension,
-        height: cropSourceDimension
-      },
-      target: {
-        x: 0,
-        y: 0,
-        width: options.width,
-        height: options.height
-      },
-      canvas: {
-        width: options.width,
-        height: options.height
-      }
-    };
-  }
-
-  // Target dimension is calculated in the rotated(transformed) coordinate.
-  var targetCanvasDimensions = ImageLoader.resizeDimensions(
-      source.width, source.height, options);
-
-  var targetDimensions = options.orientation.getSizeAfterCancelling(
-      targetCanvasDimensions.width, targetCanvasDimensions.height);
-
-  return {
-    source: {
-      x: 0,
-      y: 0,
-      width: source.width,
-      height: source.height
-    },
-    target: {
-      x: 0,
-      y: 0,
-      width: targetDimensions.width,
-      height: targetDimensions.height
-    },
-    canvas: {
-      width: targetCanvasDimensions.width,
-      height: targetCanvasDimensions.height
-    }
-  };
-};
-
-/**
- * Matrix converts AdobeRGB color space into sRGB color space.
- * @const {!Array<number>}
- */
-ImageLoader.MATRIX_FROM_ADOBE_TO_STANDARD = [
-  1.39836, -0.39836, 0.00000,
-  0.00000,  1.00000, 0.00000,
-  0.00000, -0.04293, 1.04293
-];
-
-/**
- * Converts the canvas of color space into sRGB.
- * @param {HTMLCanvasElement} target Target canvas.
- * @param {ColorSpace} colorSpace Current color space.
- */
-ImageLoader.convertColorSpace = function(target, colorSpace) {
-  if (colorSpace === ColorSpace.SRGB)
-    return;
-  if (colorSpace === ColorSpace.ADOBE_RGB) {
-    var matrix = ImageLoader.MATRIX_FROM_ADOBE_TO_STANDARD;
-    var context = target.getContext('2d');
-    var imageData = context.getImageData(0, 0, target.width, target.height);
-    var data = imageData.data;
-    for (var i = 0; i < data.length; i += 4) {
-      // Scale to [0, 1].
-      var adobeR = data[i] / 255;
-      var adobeG = data[i + 1] / 255;
-      var adobeB = data[i + 2] / 255;
-
-      // Revert gannma transformation.
-      adobeR = adobeR <= 0.0556 ? adobeR / 32 : Math.pow(adobeR, 2.2);
-      adobeG = adobeG <= 0.0556 ? adobeG / 32 : Math.pow(adobeG, 2.2);
-      adobeB = adobeB <= 0.0556 ? adobeB / 32 : Math.pow(adobeB, 2.2);
-
-      // Convert color space.
-      var sR = matrix[0] * adobeR + matrix[1] * adobeG + matrix[2] * adobeB;
-      var sG = matrix[3] * adobeR + matrix[4] * adobeG + matrix[5] * adobeB;
-      var sB = matrix[6] * adobeR + matrix[7] * adobeG + matrix[8] * adobeB;
-
-      // Gannma transformation.
-      sR = sR <= 0.0031308 ? 12.92 * sR : 1.055 * Math.pow(sR, 1 / 2.4) - 0.055;
-      sG = sG <= 0.0031308 ? 12.92 * sG : 1.055 * Math.pow(sG, 1 / 2.4) - 0.055;
-      sB = sB <= 0.0031308 ? 12.92 * sB : 1.055 * Math.pow(sB, 1 / 2.4) - 0.055;
-
-      // Scale to [0, 255].
-      data[i] = Math.max(0, Math.min(255, sR * 255));
-      data[i + 1] = Math.max(0, Math.min(255, sG * 255));
-      data[i + 2] = Math.max(0, Math.min(255, sB * 255));
-    }
-    context.putImageData(imageData, 0, 0);
-  }
-};
+};