The Tor Browser / file comparison
comparison: toolkit/components/places/ColorAnalyzer.js
toolkit/components/places/ColorAnalyzer.js
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
equal
deleted
inserted
replaced
| -1:000000000000 | 0:581c06e9b5c4 |
|---|---|
| 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/. */ | |
| 4 | |
| 5 "use strict"; | |
| 6 | |
| 7 const Ci = Components.interfaces; | |
| 8 const Cc = Components.classes; | |
| 9 const Cu = Components.utils; | |
| 10 | |
| 11 Cu.import("resource://gre/modules/XPCOMUtils.jsm"); | |
| 12 | |
| 13 const XHTML_NS = "http://www.w3.org/1999/xhtml"; | |
| 14 const MAXIMUM_PIXELS = Math.pow(144, 2); | |
| 15 | |
| 16 function ColorAnalyzer() { | |
| 17 // a queue of callbacks for each job we give to the worker | |
| 18 this.callbacks = []; | |
| 19 | |
| 20 this.hiddenWindowDoc = Cc["@mozilla.org/appshell/appShellService;1"]. | |
| 21 getService(Ci.nsIAppShellService). | |
| 22 hiddenDOMWindow.document; | |
| 23 | |
| 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 } | |
| 28 | |
| 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 }, | |
| 42 | |
| 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 }, | |
| 58 | |
| 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 }, | |
| 64 | |
| 65 startJob: function ColorAnalyzer_startJob(imageData, callback) { | |
| 66 this.callbacks.push(callback); | |
| 67 this.worker.postMessage({ imageData: imageData, maxColors: 1 }); | |
| 68 }, | |
| 69 | |
| 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 }, | |
| 78 | |
| 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 }, | |
| 85 | |
| 86 classID: Components.ID("{d056186c-28a0-494e-aacc-9e433772b143}"), | |
| 87 QueryInterface: XPCOMUtils.generateQI([Ci.mozIColorAnalyzer]) | |
| 88 }; | |
| 89 | |
| 90 this.NSGetFactory = XPCOMUtils.generateNSGetFactory([ColorAnalyzer]); |
