The Tor Browser / file diff

     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/toolkit/components/places/ColorAnalyzer.js	Wed Dec 31 06:09:35 2014 +0100
     1.3 @@ -0,0 +1,90 @@
     1.4 +/* This Source Code Form is subject to the terms of the Mozilla Public
     1.5 + * License, v. 2.0. If a copy of the MPL was not distributed with this
     1.6 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
     1.7 +
     1.8 +"use strict";
     1.9 +
    1.10 +const Ci = Components.interfaces;
    1.11 +const Cc = Components.classes;
    1.12 +const Cu = Components.utils;
    1.13 +
    1.14 +Cu.import("resource://gre/modules/XPCOMUtils.jsm");
    1.15 +
    1.16 +const XHTML_NS = "http://www.w3.org/1999/xhtml";
    1.17 +const MAXIMUM_PIXELS = Math.pow(144, 2);
    1.18 +
    1.19 +function ColorAnalyzer() {
    1.20 +  // a queue of callbacks for each job we give to the worker
    1.21 +  this.callbacks = [];
    1.22 +
    1.23 +  this.hiddenWindowDoc = Cc["@mozilla.org/appshell/appShellService;1"].
    1.24 +                         getService(Ci.nsIAppShellService).
    1.25 +                         hiddenDOMWindow.document;
    1.26 +
    1.27 +  this.worker = new ChromeWorker("resource://gre/modules/ColorAnalyzer_worker.js");
    1.28 +  this.worker.onmessage = this.onWorkerMessage.bind(this);
    1.29 +  this.worker.onerror = this.onWorkerError.bind(this);
    1.30 +}
    1.31 +
    1.32 +ColorAnalyzer.prototype = {
    1.33 +  findRepresentativeColor: function ColorAnalyzer_frc(imageURI, callback) {
    1.34 +    function cleanup() {
    1.35 +      image.removeEventListener("load", loadListener);
    1.36 +      image.removeEventListener("error", errorListener);
    1.37 +    }
    1.38 +    let image = this.hiddenWindowDoc.createElementNS(XHTML_NS, "img");
    1.39 +    let loadListener = this.onImageLoad.bind(this, image, callback, cleanup);
    1.40 +    let errorListener = this.onImageError.bind(this, image, callback, cleanup);
    1.41 +    image.addEventListener("load", loadListener);
    1.42 +    image.addEventListener("error", errorListener);
    1.43 +    image.src = imageURI.spec;
    1.44 +  },
    1.45 +
    1.46 +  onImageLoad: function ColorAnalyzer_onImageLoad(image, callback, cleanup) {
    1.47 +    if (image.naturalWidth * image.naturalHeight > MAXIMUM_PIXELS) {
    1.48 +      // this will probably take too long to process - fail
    1.49 +      callback.onComplete(false);
    1.50 +    } else {
    1.51 +      let canvas = this.hiddenWindowDoc.createElementNS(XHTML_NS, "canvas");
    1.52 +      canvas.width = image.naturalWidth;
    1.53 +      canvas.height = image.naturalHeight;
    1.54 +      let ctx = canvas.getContext("2d");
    1.55 +      ctx.drawImage(image, 0, 0);
    1.56 +      this.startJob(ctx.getImageData(0, 0, canvas.width, canvas.height),
    1.57 +                    callback);
    1.58 +    }
    1.59 +    cleanup();
    1.60 +  },
    1.61 +
    1.62 +  onImageError: function ColorAnalyzer_onImageError(image, callback, cleanup) {
    1.63 +    Cu.reportError("ColorAnalyzer: image at " + image.src + " didn't load");
    1.64 +    callback.onComplete(false);
    1.65 +    cleanup();
    1.66 +  },
    1.67 +
    1.68 +  startJob: function ColorAnalyzer_startJob(imageData, callback) {
    1.69 +    this.callbacks.push(callback);
    1.70 +    this.worker.postMessage({ imageData: imageData, maxColors: 1 });
    1.71 +  },
    1.72 +
    1.73 +  onWorkerMessage: function ColorAnalyzer_onWorkerMessage(event) {
    1.74 +    // colors can be empty on failure
    1.75 +    if (event.data.colors.length < 1) {
    1.76 +      this.callbacks.shift().onComplete(false);
    1.77 +    } else {
    1.78 +      this.callbacks.shift().onComplete(true, event.data.colors[0]);
    1.79 +    }
    1.80 +  },
    1.81 +
    1.82 +  onWorkerError: function ColorAnalyzer_onWorkerError(error) {
    1.83 +    // this shouldn't happen, but just in case
    1.84 +    error.preventDefault();
    1.85 +    Cu.reportError("ColorAnalyzer worker: " + error.message);
    1.86 +    this.callbacks.shift().onComplete(false);
    1.87 +  },
    1.88 +
    1.89 +  classID: Components.ID("{d056186c-28a0-494e-aacc-9e433772b143}"),
    1.90 +  QueryInterface: XPCOMUtils.generateQI([Ci.mozIColorAnalyzer])
    1.91 +};
    1.92 +
    1.93 +this.NSGetFactory = XPCOMUtils.generateNSGetFactory([ColorAnalyzer]);