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<!DOCTYPE HTML>
<html>
<!--
https://bugzilla.mozilla.org/show_bug.cgi?id=1067345
-->
<head>
<title>Test for Bug 1067345</title>
<script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
</head>
<body>
<script type="text/javascript">
// Ensure srcset/picture are enabled, re-run the test at different DPI
// levels to ensure preload step does the right responsive image selection
SimpleTest.waitForExplicitFinish();
var testDPIs = [ "1.0", "0.5", "2.0", "1.5" ];
var iframe = document.createElement("iframe");
// These accessed by child frame
var currentDPI;
document.body.appendChild(iframe);
SpecialPowers.pushPrefEnv({'set': [ [ "dom.image.srcset.enabled", true ],
[ "dom.image.picture.enabled", true ]] },
function() {
// Reset the sjs helper so repeat runs work
resetRequests();
setTimeout(nextTest, 0);
});
function resetRequests() {
// Ask the SJS to reset requests
var request = new XMLHttpRequest();
request.open('GET', "./file_img_picture_preload.sjs?reset", false);
request.send(null);
is(request.status, 200, "Sending reset to helper should succeed");
// Script responds with pre-reset request count
var previousRequests = +request.responseText;
return previousRequests;
}
// Called when iframe is finished
function childTestFinished(requestsMade) {
setTimeout(function() {
// Reset sjs, ensure no new requests appeared after test finished
var requestsCleared = resetRequests();
is(requestsCleared, requestsMade,
"Should not have recorded new requests after test iteration completed");
setTimeout(nextTest, 0);
}, 0);
}
function nextTest() {
// Re-run test for each DPI level
if (testDPIs.length) {
currentDPI = testDPIs.pop();
info("Starting test for DPI: " + currentDPI);
// To avoid spurious image loads being reported when the resolution changes,
// load an intermediate iframe.
iframe.src = "about:blank";
iframe.addEventListener('load', function on_iframe_load() {
iframe.removeEventListener('load', on_iframe_load);
SpecialPowers.pushPrefEnv({'set': [ [ "layout.css.devPixelsPerPx", currentDPI ]] },
function() {
// Clear image cache for next run (we don't try to validate cached items
// in preload).
SpecialPowers.Cc["@mozilla.org/image/tools;1"]
.getService(SpecialPowers.Ci.imgITools)
.getImgCacheForDocument(iframe.contentDocument)
.clearCache(false);
iframe.src = "./file_img_picture_preload.html?" + currentDPI;
});
});
} else {
SimpleTest.finish();
}
}
</script>
</body>
</html>
|
