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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, 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;
canvas.height = 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 smellsLikeImageData(imageData) {
// See if this object 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.
return (typeof imageData == 'object') && ('width' in imageData) &&
('height' in imageData) && ('data' in imageData);
}
function verifyImageData(imageData) {
if (!smellsLikeImageData(imageData)) {
throw new Error(
'The imageData property must contain an ImageData object or' +
' dictionary of ImageData objects.');
}
}
/**
* 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) {
// 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) {
if (smellsLikeImageData(details.imageData)) {
var imageData = details.imageData;
details.imageData = {};
details.imageData[imageData.width.toString()] = imageData;
} else if (typeof details.imageData == 'object' &&
Object.getOwnPropertyNames(details.imageData).length !== 0) {
for (var sizeKey in details.imageData) {
verifyImageData(details.imageData[sizeKey]);
}
} else {
verifyImageData(false);
}
callback(SetIconCommon(details));
return;
}
if ('path' in details) {
if (typeof details.path == 'object') {
details.imageData = {};
var detailKeyCount = 0;
for (var iconSize in details.path) {
++detailKeyCount;
loadImagePath(details.path[iconSize], function(size, imageData) {
details.imageData[size] = imageData;
if (--detailKeyCount == 0)
callback(SetIconCommon(details));
}.bind(null, iconSize));
}
if (detailKeyCount == 0)
throw new Error('The path property must not be empty.');
} else if (typeof details.path == 'string') {
details.imageData = {};
loadImagePath(details.path, function(imageData) {
details.imageData[imageData.width.toString()] = imageData;
delete details.path;
callback(SetIconCommon(details));
});
}
return;
}
throw new Error('Either the path or imageData property must be specified.');
}
exports.$set('setIcon', setIcon);
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