toolkit/components/places/ColorAnalyzer.js@129ffea94266
toolkit/components/places/ColorAnalyzer.js
Sat, 03 Jan 2015 20:18:00 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Sat, 03 Jan 2015 20:18:00 +0100
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
- permissions
- -rw-r--r--
Conditionally enable double key logic according to:
private browsing mode or privacy.thirdparty.isolate preference and
implement in GetCookieStringCommon and FindCookie where it counts...
With some reservations of how to convince FindCookie users to test
condition and pass a nullptr when disabling double key logic.
1 /* This Source Code Form is subject to the terms of the Mozilla Public
2 * License, v. 2.0. If a copy of the MPL was not distributed with this
3 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
5 "use strict";
7 const Ci = Components.interfaces;
8 const Cc = Components.classes;
9 const Cu = Components.utils;
11 Cu.import("resource://gre/modules/XPCOMUtils.jsm");
13 const XHTML_NS = "http://www.w3.org/1999/xhtml";
14 const MAXIMUM_PIXELS = Math.pow(144, 2);
16 function ColorAnalyzer() {
17 // a queue of callbacks for each job we give to the worker
18 this.callbacks = [];
20 this.hiddenWindowDoc = Cc["@mozilla.org/appshell/appShellService;1"].
21 getService(Ci.nsIAppShellService).
22 hiddenDOMWindow.document;
24 this.worker = new ChromeWorker("resource://gre/modules/ColorAnalyzer_worker.js");
25 this.worker.onmessage = this.onWorkerMessage.bind(this);
26 this.worker.onerror = this.onWorkerError.bind(this);
27 }
29 ColorAnalyzer.prototype = {
30 findRepresentativeColor: function ColorAnalyzer_frc(imageURI, callback) {
31 function cleanup() {
32 image.removeEventListener("load", loadListener);
33 image.removeEventListener("error", errorListener);
34 }
35 let image = this.hiddenWindowDoc.createElementNS(XHTML_NS, "img");
36 let loadListener = this.onImageLoad.bind(this, image, callback, cleanup);
37 let errorListener = this.onImageError.bind(this, image, callback, cleanup);
38 image.addEventListener("load", loadListener);
39 image.addEventListener("error", errorListener);
40 image.src = imageURI.spec;
41 },
43 onImageLoad: function ColorAnalyzer_onImageLoad(image, callback, cleanup) {
44 if (image.naturalWidth * image.naturalHeight > MAXIMUM_PIXELS) {
45 // this will probably take too long to process - fail
46 callback.onComplete(false);
47 } else {
48 let canvas = this.hiddenWindowDoc.createElementNS(XHTML_NS, "canvas");
49 canvas.width = image.naturalWidth;
50 canvas.height = image.naturalHeight;
51 let ctx = canvas.getContext("2d");
52 ctx.drawImage(image, 0, 0);
53 this.startJob(ctx.getImageData(0, 0, canvas.width, canvas.height),
54 callback);
55 }
56 cleanup();
57 },
59 onImageError: function ColorAnalyzer_onImageError(image, callback, cleanup) {
60 Cu.reportError("ColorAnalyzer: image at " + image.src + " didn't load");
61 callback.onComplete(false);
62 cleanup();
63 },
65 startJob: function ColorAnalyzer_startJob(imageData, callback) {
66 this.callbacks.push(callback);
67 this.worker.postMessage({ imageData: imageData, maxColors: 1 });
68 },
70 onWorkerMessage: function ColorAnalyzer_onWorkerMessage(event) {
71 // colors can be empty on failure
72 if (event.data.colors.length < 1) {
73 this.callbacks.shift().onComplete(false);
74 } else {
75 this.callbacks.shift().onComplete(true, event.data.colors[0]);
76 }
77 },
79 onWorkerError: function ColorAnalyzer_onWorkerError(error) {
80 // this shouldn't happen, but just in case
81 error.preventDefault();
82 Cu.reportError("ColorAnalyzer worker: " + error.message);
83 this.callbacks.shift().onComplete(false);
84 },
86 classID: Components.ID("{d056186c-28a0-494e-aacc-9e433772b143}"),
87 QueryInterface: XPCOMUtils.generateQI([Ci.mozIColorAnalyzer])
88 };
90 this.NSGetFactory = XPCOMUtils.generateNSGetFactory([ColorAnalyzer]);
