Display images in multiline Braille

chrome/browser/resources/chromeos/chromevox/chromevox/background/braille_captions_background.js

 // Copyright 2014 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.
 
 /** @fileoverview If the braille captions feature is enabled, sends
  * braille content to the Panel on Chrome OS, or a content script on
  * other platforms.
  */
 
 goog.provide('cvox.BrailleCaptionsBackground');
@@ skipping 72 matching lines @@
   } else {
     cvox.ExtensionBridge.send({
       message: 'BRAILLE_CAPTION',
       text: text,
       brailleChars: brailleChars
     });
   }
 };
 
 /**
+ * @param {ArrayBuffer} cells Braille cells shown on the display.
+ * @param {number} rows Number of rows to display.
+ * @param {number} columns Number of columns to display.
+ */
+cvox.BrailleCaptionsBackground.setImageContent = function(cells, rows,
+    columns) {
+  var self = cvox.BrailleCaptionsBackground;
+  // Convert the cells to Unicode braille pattern characters.
+  var byteBuf = new Uint8Array(cells);
+  var brailleChars = '';
+
+  for (var i = 0; i < byteBuf.length; ++i) {
+    brailleChars += String.fromCharCode(
+        self.BRAILLE_UNICODE_BLOCK_START | byteBuf[i]);
+  }
+
+  var groups = [['Image', brailleChars]];
+  var data = {groups: groups, rows: rows, cols: columns};
+  (new PanelCommand(PanelCommandType.UPDATE_BRAILLE, data)).send();
+};
+
+
+
+
+/**
  * @param {string} brailleChars Braille characters shown on the display.
  * @param {string} text Text of the shown braille.
  * @param {Array<number>} brailleToText Map of Braille cells to the first
  *     index of corresponding text letter.
  * @param {{brailleOffset: number, textOffset: number}} offsets
  *    Offsets to use for caculating indices. The element is the braille offset,
  *    the second is the text offset.
  * @return {Array} The groups of braille and texts to be displayed.
  */
 cvox.BrailleCaptionsBackground.groupBrailleAndText = function(brailleChars,
@@ skipping 54 matching lines @@
 cvox.BrailleCaptionsBackground.getVirtualDisplayState = function() {
   var self = cvox.BrailleCaptionsBackground;
   if (self.isEnabled()) {
     var rows = parseInt(localStorage['virtualBrailleRows'], 10) || 1;
     var columns = parseInt(localStorage['virtualBrailleColumns'], 10) || 40;
     return {available: true, textRowCount: rows, textColumnCount: columns};
   } else {
     return {available: false};
   }
 };