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- // 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.
-
- var SetIconCommon = requireNative('setIcon').SetIconCommon;
- var sendRequest = require('sendRequest').sendRequest;
-
- function loadImagePath(path, iconSize, callback) {
- var img = new Image();
- img.onerror = function() {
- console.error('Could not load action icon \'' + path + '\'.');
- };
- img.onload = function() {
- var canvas = document.createElement('canvas');
- canvas.width = img.width > iconSize ? iconSize : img.width;
- canvas.height = img.height > iconSize ? iconSize : img.height;
-
- var canvas_context = canvas.getContext('2d');
- canvas_context.clearRect(0, 0, canvas.width, canvas.height);
- canvas_context.drawImage(img, 0, 0, canvas.width, canvas.height);
- var imageData = canvas_context.getImageData(0, 0, canvas.width,
- canvas.height);
- callback(imageData);
- };
- img.src = path;
- }
-
- function verifyImageData(imageData, iconSize) {
- // Verify that this at least looks like an ImageData element.
- // Unfortunately, we cannot use instanceof because the ImageData
- // constructor is not public.
- //
- // We do this manually instead of using JSONSchema to avoid having these
- // properties show up in the doc.
- if (!('width' in imageData) ||
- !('height' in imageData) ||
- !('data' in imageData)) {
- throw new Error(
- 'The imageData property must contain an ImageData object or' +
- ' dictionary of ImageData objects.');
- }
-
- if (imageData.width > iconSize ||
- imageData.height > iconSize) {
- throw new Error(
- 'The imageData property must contain an ImageData object that ' +
- 'is no larger than ' + iconSize + ' pixels square.');
- }
- }
-
- /**
- * Normalizes |details| to a format suitable for sending to the browser,
- * for example converting ImageData to a binary representation.
- *
- * @param {ImageDetails} details
- * The ImageDetails passed into an extension action-style API.
- * @param {Function} callback
- * The callback function to pass processed imageData back to. Note that this
- * callback may be called reentrantly.
- */
- function setIcon(details, callback) {
- var iconSizes = [19, 38];
- // Note that iconIndex is actually deprecated, and only available to the
- // pageAction API.
- // TODO(kalman): Investigate whether this is for the pageActions API, and if
- // so, delete it.
- if ('iconIndex' in details) {
- callback(details);
- return;
- }
-
- if ('imageData' in details) {
- var isEmpty = true;
- for (var i = 0; i < iconSizes.length; i++) {
- var sizeKey = iconSizes[i].toString();
- if (sizeKey in details.imageData) {
- verifyImageData(details.imageData[sizeKey], iconSizes[i]);
- isEmpty =false;
- }
- }
-
- if (isEmpty) {
- // If details.imageData is not dictionary with keys in set {'19', '38'},
- // it must be an ImageData object.
- var sizeKey = iconSizes[0].toString();
- var imageData = details.imageData;
- details.imageData = {};
- details.imageData[sizeKey] = imageData;
- verifyImageData(details.imageData[sizeKey], iconSizes[0]);
- }
- callback(SetIconCommon(details));
- return;
- }
-
- if ('path' in details) {
- if (typeof details.path == 'object') {
- details.imageData = {};
- var isEmpty = true;
- var processIconSize = function(index) {
- if (index == iconSizes.length) {
- delete details.path;
- if (isEmpty)
- throw new Error('The path property must not be empty.');
- callback(SetIconCommon(details));
- return;
- }
- var sizeKey = iconSizes[index].toString();
- if (!(sizeKey in details.path)) {
- processIconSize(index + 1);
- return;
- }
- isEmpty = false;
- loadImagePath(details.path[sizeKey], iconSizes[index],
- function(imageData) {
- details.imageData[sizeKey] = imageData;
- processIconSize(index + 1);
- });
- }
- processIconSize(0);
- } else if (typeof details.path == 'string') {
- var sizeKey = iconSizes[0].toString();
- details.imageData = {};
- loadImagePath(details.path, iconSizes[0],
- function(imageData) {
- details.imageData[sizeKey] = imageData;
- delete details.path;
- callback(SetIconCommon(details));
- return;
- });
- }
- return;
- }
- throw new Error('Either the path or imageData property must be specified.');
- }
-
- exports.setIcon = setIcon;
-