dom/browser-element/mochitest/browserElement_GetScreenshotDppx.js@b8a032363ba2 (annotated)
dom/browser-element/mochitest/browserElement_GetScreenshotDppx.js
Thu, 22 Jan 2015 13:21:57 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Thu, 22 Jan 2015 13:21:57 +0100
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
- permissions
- -rw-r--r--
Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6
| michael@0 | 1 | /* Any copyright is dedicated to the public domain. |
| michael@0 | 2 | http://creativecommons.org/publicdomain/zero/1.0/ */ |
| michael@0 | 3 | |
| michael@0 | 4 | // Test the getScreenshot property for mozbrowser |
| michael@0 | 5 | "use strict"; |
| michael@0 | 6 | |
| michael@0 | 7 | SimpleTest.waitForExplicitFinish(); |
| michael@0 | 8 | browserElementTestHelpers.setEnabledPref(true); |
| michael@0 | 9 | browserElementTestHelpers.addPermission(); |
| michael@0 | 10 | |
| michael@0 | 11 | function runTest() { |
| michael@0 | 12 | var dppxPref = 'layout.css.devPixelsPerPx'; |
| michael@0 | 13 | var cssPixelWidth = 600; |
| michael@0 | 14 | var cssPixelHeight = 400; |
| michael@0 | 15 | |
| michael@0 | 16 | var iframe1 = document.createElement('iframe'); |
| michael@0 | 17 | iframe1.setAttribute('width', cssPixelWidth); |
| michael@0 | 18 | iframe1.setAttribute('height', cssPixelHeight); |
| michael@0 | 19 | SpecialPowers.wrap(iframe1).mozbrowser = true; |
| michael@0 | 20 | |
| michael@0 | 21 | iframe1.src = 'data:text/html,<html><body>hello</body></html>'; |
| michael@0 | 22 | document.body.appendChild(iframe1); |
| michael@0 | 23 | |
| michael@0 | 24 | var images = []; |
| michael@0 | 25 | |
| michael@0 | 26 | function screenshotTaken(image) { |
| michael@0 | 27 | images.push(image); |
| michael@0 | 28 | if (images.length === 1) { |
| michael@0 | 29 | ok(true, 'Got initial non blank screenshot'); |
| michael@0 | 30 | |
| michael@0 | 31 | if (image.width !== cssPixelWidth || image.height !== cssPixelHeight) { |
| michael@0 | 32 | ok(false, 'The pixel width of the image received is not correct'); |
| michael@0 | 33 | SimpleTest.finish(); |
| michael@0 | 34 | return; |
| michael@0 | 35 | } |
| michael@0 | 36 | ok(true, 'The pixel width of the image received is correct'); |
| michael@0 | 37 | |
| michael@0 | 38 | SpecialPowers.pushPrefEnv( |
| michael@0 | 39 | {'set': [['layout.css.devPixelsPerPx', 2]]}, takeScreenshot); |
| michael@0 | 40 | } |
| michael@0 | 41 | else if (images.length === 2) { |
| michael@0 | 42 | ok(true, 'Got updated screenshot after source page changed'); |
| michael@0 | 43 | |
| michael@0 | 44 | if (image.width !== cssPixelWidth * 2 || |
| michael@0 | 45 | image.height !== cssPixelHeight * 2) { |
| michael@0 | 46 | ok(false, 'The pixel width of the 2dppx image received is not correct'); |
| michael@0 | 47 | SimpleTest.finish(); |
| michael@0 | 48 | return; |
| michael@0 | 49 | } |
| michael@0 | 50 | ok(true, 'The pixel width of the 2dppx image received is correct'); |
| michael@0 | 51 | SimpleTest.finish(); |
| michael@0 | 52 | } |
| michael@0 | 53 | } |
| michael@0 | 54 | |
| michael@0 | 55 | function takeScreenshot() { |
| michael@0 | 56 | function gotImage(e) { |
| michael@0 | 57 | // |this| is the Image. |
| michael@0 | 58 | |
| michael@0 | 59 | URL.revokeObjectURL(this.src); |
| michael@0 | 60 | |
| michael@0 | 61 | if (e.type === 'error' || !this.width || !this.height) { |
| michael@0 | 62 | tryAgain(); |
| michael@0 | 63 | |
| michael@0 | 64 | return; |
| michael@0 | 65 | } |
| michael@0 | 66 | |
| michael@0 | 67 | screenshotTaken(this); |
| michael@0 | 68 | } |
| michael@0 | 69 | |
| michael@0 | 70 | function tryAgain() { |
| michael@0 | 71 | if (--attempts === 0) { |
| michael@0 | 72 | ok(false, 'Timed out waiting for correct screenshot'); |
| michael@0 | 73 | SimpleTest.finish(); |
| michael@0 | 74 | } else { |
| michael@0 | 75 | setTimeout(function() { |
| michael@0 | 76 | iframe1.getScreenshot(cssPixelWidth, cssPixelHeight).onsuccess = |
| michael@0 | 77 | getScreenshotImageData; |
| michael@0 | 78 | }, 200); |
| michael@0 | 79 | } |
| michael@0 | 80 | } |
| michael@0 | 81 | |
| michael@0 | 82 | function getScreenshotImageData(e) { |
| michael@0 | 83 | var blob = e.target.result; |
| michael@0 | 84 | if (blob.size === 0) { |
| michael@0 | 85 | tryAgain(); |
| michael@0 | 86 | |
| michael@0 | 87 | return; |
| michael@0 | 88 | } |
| michael@0 | 89 | |
| michael@0 | 90 | var img = new Image(); |
| michael@0 | 91 | img.src = URL.createObjectURL(blob); |
| michael@0 | 92 | img.onload = img.onerror = gotImage; |
| michael@0 | 93 | } |
| michael@0 | 94 | |
| michael@0 | 95 | var attempts = 10; |
| michael@0 | 96 | iframe1.getScreenshot(cssPixelWidth, cssPixelHeight).onsuccess = |
| michael@0 | 97 | getScreenshotImageData; |
| michael@0 | 98 | } |
| michael@0 | 99 | |
| michael@0 | 100 | function iframeLoadedHandler() { |
| michael@0 | 101 | SpecialPowers.pushPrefEnv( |
| michael@0 | 102 | {'set': [['layout.css.devPixelsPerPx', 1]]}, takeScreenshot); |
| michael@0 | 103 | } |
| michael@0 | 104 | |
| michael@0 | 105 | iframe1.addEventListener('mozbrowserloadend', iframeLoadedHandler); |
| michael@0 | 106 | } |
| michael@0 | 107 | |
| michael@0 | 108 | addEventListener('testready', runTest); |
