test_bug469170.html (1352B)
1 <!DOCTYPE HTML> 2 <html> 3 <!-- 4 https://bugzilla.mozilla.org/show_bug.cgi?id=469170 5 --> 6 <head> 7 <title>Test for Bug 469170</title> 8 <script src="/tests/SimpleTest/SimpleTest.js"></script> 9 <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/> 10 </head> 11 <body onload="runTest();"> 12 <p><a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=469170">Mozilla Bug 469170</a></p> 13 14 <iframe id="source" width="50" height="50" srcdoc="<html></html>"></iframe> 15 16 <pre id="test"> 17 <script type="application/javascript"> 18 19 /** Test for Bug 469170 */ 20 21 SimpleTest.waitForExplicitFinish(); 22 23 function runTest() { 24 var source = document.getElementById('source').contentWindow; 25 rect = { left: 0, top: 0, 26 width: source.innerWidth, height: source.innerHeight }; 27 var canvas = SpecialPowers.snapshotRect(source, rect, "transparent"); 28 var context = canvas.getContext("2d"); 29 30 var components = [ "red", "green", "blue", "alpha" ]; 31 32 var data = context.getImageData(0, 0, canvas.width, canvas.height).data; 33 var failed = false; 34 for (var i = 0; i < data.length; i++) { 35 if (data[i] != 0) { 36 is(data[i], 0, "pixel " + Math.floor(i/4) + " " + components[i%4]); 37 failed = true; 38 } 39 } 40 if (!failed) { 41 ok(!failed, "all pixels fully transparent"); 42 } 43 SimpleTest.finish(); 44 } 45 </script> 46 </pre> 47 </body> 48 </html>