Print photos in full resolution from the Photo Editor

chrome/browser/resources/file_manager/js/image_editor/image_view.js

 // Copyright (c) 2012 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.
 
 /**
  * The overlay displaying the image.
  * @param {HTMLElement} container The container element.
  * @param {Viewport} viewport The viewport.
  * @param {MetadataCache} metadataCache The metadataCache.
  */
@@ skipping 477 matching lines @@
  * @param {boolean} opt_reuseScreenCanvas True if it is OK to reuse the screen
  *   resolution canvas.
  * @param {number} opt_width Image width.
  * @param {number} opt_height Image height.
  * @param {boolean} opt_preview True if the image is a preview (not full res).
  * @private
  */
 ImageView.prototype.replaceContent_ = function(
     content, opt_reuseScreenCanvas, opt_width, opt_height, opt_preview) {
 
+  if (this.contentCanvas_ && this.contentCanvas_.parentNode == this.container_)
+    this.container_.removeChild(this.contentCanvas_);
+
   if (content.constructor.name == 'HTMLVideoElement') {
     this.contentCanvas_ = null;
     this.videoElement_ = content;
     this.screenImage_ = content;
     this.screenImage_.className = 'image';
     return;
   }
 
   if (!opt_reuseScreenCanvas || !this.screenImage_ ||
       this.screenImage_.constructor.name == 'HTMLVideoElement') {
@@ skipping 11 matching lines @@
   this.viewport_.update();
   this.draw();
 
   if (opt_reuseScreenCanvas && !this.screenImage_.parentNode) {
     this.container_.appendChild(this.screenImage_);
   }
 
   this.preview_ = opt_preview;
   // If this is not a thumbnail, cache the content and the screen-scale image.
   if (this.hasValidImage()) {
+    // Insert the full resolution canvas into DOM so that it can be printed.
+    this.container_.appendChild(this.contentCanvas_);
+    this.contentCanvas_.classList.add('fullres');
+
     this.contentCache_.putItem(this.contentID_, this.contentCanvas_, true);
     this.screenCache_.putItem(this.contentID_, this.screenImage_);
 
     // TODO(kaznacheev): It is better to pass screenImage_ as it is usually
     // much smaller than contentCanvas_ and still contains the entire image.
     // Once we implement zoom/pan we should pass contentCanvas_ instead.
     this.updateThumbnail_(this.screenImage_);
 
     this.contentRevision_++;
     for (var i = 0; i != this.contentCallbacks_.length; i++) {
@@ skipping 251 matching lines @@
 
 /**
  * Evict the least recently used items.
  */
 ImageView.Cache.prototype.evictLRU = function() {
   if (this.order_.length == this.capacity_) {
     var id = this.order_.shift();
     delete this.map_[id];
   }
 };