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comparison: dom/browser-element/mochitest/browserElement_GetScreenshot.js
dom/browser-element/mochitest/browserElement_GetScreenshot.js
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| 1 /* Any copyright is dedicated to the public domain. | |
| 2 http://creativecommons.org/publicdomain/zero/1.0/ */ | |
| 3 | |
| 4 // Test the getScreenshot property for mozbrowser | |
| 5 "use strict"; | |
| 6 | |
| 7 SimpleTest.waitForExplicitFinish(); | |
| 8 browserElementTestHelpers.setEnabledPref(true); | |
| 9 browserElementTestHelpers.addPermission(); | |
| 10 | |
| 11 function runTest() { | |
| 12 var iframe1 = document.createElement('iframe'); | |
| 13 SpecialPowers.wrap(iframe1).mozbrowser = true; | |
| 14 document.body.appendChild(iframe1); | |
| 15 iframe1.src = 'data:text/html,<html>' + | |
| 16 '<body style="background:green">hello</body></html>'; | |
| 17 | |
| 18 var screenshotImageDatas = []; | |
| 19 var numLoaded = 0; | |
| 20 | |
| 21 function screenshotTaken(screenshotImageData) { | |
| 22 screenshotImageDatas.push(screenshotImageData); | |
| 23 if (screenshotImageDatas.length === 1) { | |
| 24 ok(true, 'Got initial non blank screenshot'); | |
| 25 | |
| 26 var view = screenshotImageData.data; | |
| 27 if (view[3] !== 255) { | |
| 28 ok(false, 'The first pixel of initial screenshot is not opaque'); | |
| 29 SimpleTest.finish(); | |
| 30 return; | |
| 31 } | |
| 32 ok(true, 'Verified the first pixel of initial screenshot is opaque'); | |
| 33 | |
| 34 iframe1.src = 'data:text/html,<html>' + | |
| 35 '<body style="background:transparent">hello</body></html>'; | |
| 36 | |
| 37 // Wait until screenshotImageData !== screenshotImageDatas[0]. | |
| 38 waitForScreenshot(function(screenshotImageData) { | |
| 39 var view1 = screenshotImageData.data; | |
| 40 var view2 = screenshotImageDatas[0].data; | |
| 41 | |
| 42 if (view1.length != view2.length) { | |
| 43 return true; | |
| 44 } | |
| 45 | |
| 46 for (var i = 0; i < view1.length; i++) { | |
| 47 if (view1[i] != view2[i]) { | |
| 48 return true; | |
| 49 } | |
| 50 } | |
| 51 | |
| 52 return false; | |
| 53 }, 'image/png'); | |
| 54 } | |
| 55 else if (screenshotImageDatas.length === 2) { | |
| 56 ok(true, 'Got updated screenshot after source page changed'); | |
| 57 | |
| 58 var view = screenshotImageData.data; | |
| 59 if (view[3] !== 0) { | |
| 60 // The case here will always fail when oop'd on Firefox Desktop, | |
| 61 // but not on B2G Emulator | |
| 62 // See https://bugzil.la/878003#c20 | |
| 63 | |
| 64 var isB2G = (navigator.platform === ''); | |
| 65 info('navigator.platform: ' + navigator.platform); | |
| 66 if (!isB2G && browserElementTestHelpers.getOOPByDefaultPref()) { | |
| 67 todo(false, 'The first pixel of updated screenshot is not transparent'); | |
| 68 } else { | |
| 69 ok(false, 'The first pixel of updated screenshot is not transparent'); | |
| 70 } | |
| 71 SimpleTest.finish(); | |
| 72 return; | |
| 73 } | |
| 74 | |
| 75 ok(true, 'Verified the first pixel of updated screenshot is transparent'); | |
| 76 SimpleTest.finish(); | |
| 77 } | |
| 78 } | |
| 79 | |
| 80 // We continually take screenshots until we get one that we are | |
| 81 // happy with. | |
| 82 function waitForScreenshot(filter, mimeType) { | |
| 83 function gotImage(e) { | |
| 84 // |this| is the Image. | |
| 85 | |
| 86 URL.revokeObjectURL(this.src); | |
| 87 | |
| 88 if (e.type === 'error' || !this.width || !this.height) { | |
| 89 tryAgain(); | |
| 90 | |
| 91 return; | |
| 92 } | |
| 93 | |
| 94 var canvas = document.createElement('canvas'); | |
| 95 canvas.width = canvas.height = 1000; | |
| 96 var ctx = canvas.getContext('2d'); | |
| 97 ctx.drawImage(this, 0, 0); | |
| 98 var imageData = ctx.getImageData(0, 0, 1000, 1000); | |
| 99 | |
| 100 if (filter(imageData)) { | |
| 101 screenshotTaken(imageData); | |
| 102 return; | |
| 103 } | |
| 104 tryAgain(); | |
| 105 } | |
| 106 | |
| 107 function tryAgain() { | |
| 108 if (--attempts === 0) { | |
| 109 ok(false, 'Timed out waiting for correct screenshot'); | |
| 110 SimpleTest.finish(); | |
| 111 } else { | |
| 112 setTimeout(function() { | |
| 113 iframe1.getScreenshot(1000, 1000, mimeType).onsuccess = | |
| 114 getScreenshotImageData; | |
| 115 }, 200); | |
| 116 } | |
| 117 } | |
| 118 | |
| 119 function getScreenshotImageData(e) { | |
| 120 var blob = e.target.result; | |
| 121 if (blob.type !== mimeType) { | |
| 122 ok(false, 'MIME type of screenshot taken incorrect'); | |
| 123 SimpleTest.finish(); | |
| 124 } | |
| 125 | |
| 126 if (blob.size === 0) { | |
| 127 tryAgain(); | |
| 128 | |
| 129 return; | |
| 130 } | |
| 131 | |
| 132 var img = new Image(); | |
| 133 img.src = URL.createObjectURL(blob); | |
| 134 img.onload = img.onerror = gotImage; | |
| 135 } | |
| 136 | |
| 137 var attempts = 10; | |
| 138 iframe1.getScreenshot(1000, 1000, mimeType).onsuccess = | |
| 139 getScreenshotImageData; | |
| 140 } | |
| 141 | |
| 142 function iframeLoadedHandler() { | |
| 143 numLoaded++; | |
| 144 if (numLoaded === 2) { | |
| 145 waitForScreenshot(function(screenshotImageData) { | |
| 146 return true; | |
| 147 }, 'image/jpeg'); | |
| 148 } | |
| 149 } | |
| 150 | |
| 151 iframe1.addEventListener('mozbrowserloadend', iframeLoadedHandler); | |
| 152 } | |
| 153 | |
| 154 addEventListener('testready', runTest); |
