95 lines
3.4 KiB
HTML
95 lines
3.4 KiB
HTML
<!DOCTYPE html>
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<html>
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<head>
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<style>
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.box {
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image-rendering: crisp-edges;
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}
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.small-box {
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height: 50px;
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width: 100px;
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background-position: -50px -16500px;
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background-size: 200px 33100px;
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}
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.large-box {
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height: 100px;
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width: 200px;
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background-position: -100px -33000px;
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background-size: 400px 66200px;
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}
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.vertical-space {
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height: 250px;
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width: 250px;
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}
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.image-background {
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}
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</style>
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</head>
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<body>
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<div class="box small-box image-background"></div>
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<br>
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<div class="vertical-space"></div>
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<br>
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<div class="box large-box image-background"></div>
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<script>
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function setElementImageBackground(element, image) {
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return new Promise((resolve) => {
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element.style.backgroundImage = 'url(' + image.src + ')';
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// Force layout and display so the image frame starts decoding
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document.body.offsetHeight;
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testRunner.display();
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element.addEventListener("webkitImageFrameReady", function() {
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resolve();
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}, false);
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});
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}
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function recordAndStopTrackingRepaints() {
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var repaintRects = window.internals.repaintRectsAsText();
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internals.stopTrackingRepaints()
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var pre = document.createElement('pre');
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document.body.appendChild(pre);
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pre.innerHTML = repaintRects;
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}
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(function() {
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if (window.internals && window.testRunner) {
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internals.clearMemoryCache();
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internals.settings.setWebkitImageReadyEventEnabled(true);
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internals.settings.setLargeImageAsyncDecodingEnabled(true);
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testRunner.dumpAsText(true);
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testRunner.waitUntilDone();
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}
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var image = new Image();
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image.onload = function() {
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// Force async image decoding for this image.
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if (window.internals)
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internals.setLargeImageAsyncDecodingEnabledForTesting(image, true);
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if (window.internals && window.testRunner) {
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setElementImageBackground(document.querySelector(".small-box"), image).then(() => {
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// Call the next setElementImageBackground() asynchronously, using setTimeout(, 0),
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// to avoid calling testRunner.display() while the webkitImageFrameReady callback of
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// the previous setElementImageBackground() still in the call stack.
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setTimeout(function() {
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internals.startTrackingRepaints();
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setElementImageBackground(document.querySelector(".large-box"), image).then(() => {
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recordAndStopTrackingRepaints();
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testRunner.notifyDone();
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});
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}, 0);
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});
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} else {
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document.querySelector(".small-box").style.backgroundImage = 'url(' + image.src + ')';
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document.querySelector(".large-box").style.backgroundImage = 'url(' + image.src + ')';
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}
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}
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image.src = "resources/sprite-sheet-red-green-blue.png";
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})();
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</script>
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</body>
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</html>
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