81 lines
2.4 KiB
HTML
81 lines
2.4 KiB
HTML
<!DOCTYPE HTML>
|
|
<html class="reftest-wait">
|
|
<head>
|
|
<title>Image reftest wrapper</title>
|
|
<style type="text/css">
|
|
#image1 { background-color: rgb(10, 100, 250); }
|
|
</style>
|
|
<script>
|
|
var gImg;
|
|
|
|
function runAfterAsyncEvents(aCallback) {
|
|
function handlePostMessage(aEvent) {
|
|
if (aEvent.data == 'next') {
|
|
window.removeEventListener('message', handlePostMessage, false);
|
|
aCallback();
|
|
}
|
|
}
|
|
|
|
window.addEventListener('message', handlePostMessage, false);
|
|
|
|
// We'll receive the 'message' event after everything else that's currently in
|
|
// the event queue (which is a stronger guarantee than setTimeout, because
|
|
// setTimeout events may be coalesced). This lets us ensure that we run
|
|
// aCallback *after* any asynchronous events are delivered.
|
|
window.postMessage('next', '*');
|
|
}
|
|
|
|
// The image is loaded async after the page loads
|
|
// wait for it to finish loading
|
|
function onImageLoad() {
|
|
// Use a canvas to force the image to get sync decoded.
|
|
var canvas = document.createElement('canvas');
|
|
var ctx = canvas.getContext('2d');
|
|
|
|
try {
|
|
ctx.drawImage(gImg, 0, 0);
|
|
} catch (e) {
|
|
}
|
|
|
|
// Continue after pumping the event loop.
|
|
runAfterAsyncEvents(step2);
|
|
}
|
|
|
|
function step2() {
|
|
// Only now, once the image has already been sync decoded, do we load it in
|
|
// the <img> element we're going to snapshot. That's because for some of the
|
|
// tests that use wrapper.html, an error is only detected when decoding the
|
|
// actual image data - i.e., the error isn't detected in the header. The
|
|
// precise time when we detect the error, unfortunately, affects how we draw
|
|
// the image. This will be fixed in bug 1182531, and then we can simplify this
|
|
// code.
|
|
|
|
var finalImg = document.getElementById('image1');
|
|
finalImg.onload = finalImg.onerror = step3;
|
|
finalImg.src = gImg.src;
|
|
}
|
|
|
|
function step3() {
|
|
// We're ready to take the snapshot, but pump the event loop first just to
|
|
// be sure that everything has settled down.
|
|
runAfterAsyncEvents(takeSnapshot);
|
|
}
|
|
|
|
function takeSnapshot() {
|
|
document.documentElement.removeAttribute("class");
|
|
}
|
|
</script>
|
|
</head>
|
|
<body>
|
|
<!-- non-empty alt to avoid the broken image icon -->
|
|
<img id="image1" alt=" ">
|
|
<script>
|
|
// Use as "wrapper.html?image.png
|
|
gImg = document.createElement('img');
|
|
gImg.onload = gImg.onerror = onImageLoad;
|
|
gImg.src = document.location.search.substr(1);
|
|
</script>
|
|
</body>
|
|
</html>
|
|
|