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Issue 29333297: Issue 3375 - Issue reporter: move screenshot creation into the content process (Closed)
Patch Set: Made sure screenshotDataCollector is always initialized Created Jan. 7, 2016, 6:57 p.m.
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1 /*
2 * This file is part of Adblock Plus <https://adblockplus.org/>,
3 * Copyright (C) 2006-2015 Eyeo GmbH
4 *
5 * Adblock Plus is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 3 as
7 * published by the Free Software Foundation.
8 *
9 * Adblock Plus is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with Adblock Plus. If not, see <http://www.gnu.org/licenses/>.
16 */
17
18 /**
19 * @fileOverview Collects some data for a content window, to be attached to
20 * issue reports.
21 */
22
23 "use strict";
24
25 let {Services} = Cu.import("resource://gre/modules/Services.jsm", {});
26 let {Task} = Cu.import("resource://gre/modules/Task.jsm", {});
27
28 let {Utils} = require("utils");
29
30 addMessageListener("AdblockPlus:CollectData", onCollectData);
31 onShutdown.add(() => {
32 removeMessageListener("AdblockPlus:CollectData", onCollectData);
33 });
34
35 function onCollectData(message)
36 {
37 let {outerWindowID, screenshotWidth, responseID} = message.data;
38
39 function success(data)
40 {
41 sendAsyncMessage("AdblockPlus:CollectDataResponse", {
42 responseID,
43 data
44 });
45 }
46
47 function error(e)
48 {
49 Cu.reportError(e);
50 sendAsyncMessage("AdblockPlus:CollectDataResponse", {
51 responseID,
52 data: null
53 });
54 }
55
56 let window = Services.wm.getOuterWindowWithId(outerWindowID);
57 if (window)
58 {
59 Task.spawn(function*()
60 {
61 let data = {};
62 data.screenshot = yield createScreenshot(window, screenshotWidth);
63 return data;
64 }).then(success, error);
65 }
66 }
67
68 function* createScreenshot(window, screenshotWidth)
69 {
70 let canvas = window.document.createElement("canvas");
71 canvas.width = screenshotWidth;
72
73 let context = canvas.getContext("2d");
74 let wndWidth = window.document.documentElement.scrollWidth;
75 let wndHeight = window.document.documentElement.scrollHeight;
76
77 // Copy scaled screenshot of the webpage, according to the specified width.
78
79 // Gecko doesn't like sizes more than 64k, restrict to 30k to be on the safe s ide.
80 // Also, make sure height is at most five times the width to keep image size d own.
81 let copyWidth = Math.min(wndWidth, 30000);
82 let copyHeight = Math.min(wndHeight, 30000, copyWidth * 5);
83 let copyX = Math.max(Math.min(window.scrollX - copyWidth / 2, wndWidth - copyW idth), 0);
84 let copyY = Math.max(Math.min(window.scrollY - copyHeight / 2, wndHeight - cop yHeight), 0);
85
86 let scalingFactor = screenshotWidth / copyWidth;
87 canvas.height = copyHeight * scalingFactor;
88
89 context.save();
90 context.scale(scalingFactor, scalingFactor);
91 context.drawWindow(window, copyX, copyY, copyWidth, copyHeight, "rgb(255,255,2 55)");
92 context.restore();
93
94 // Reduce colors
95 let pixelData = context.getImageData(0, 0, canvas.width, canvas.height);
96 let max = pixelData.width * pixelData.height * 4;
97 let mapping = [0x00, 0x55, 0xAA, 0xFF];
98 for (let i = 0; i < max; i++)
99 {
100 pixelData.data[i] = mapping[pixelData.data[i] >> 6];
101
102 if (i % 5000 == 0)
103 {
104 // Take a break every 5000 bytes to prevent browser hangs
105 yield new Promise((resolve, reject) => Utils.runAsync(resolve));
106 }
107 }
108
109 // Convert the data into an image URL
110 context.putImageData(pixelData, 0, 0);
111 return canvas.toDataURL("image/png");
112 }
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