78 lines
2.7 KiB
HTML
78 lines
2.7 KiB
HTML
<!DOCTYPE html>
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<html>
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<style>
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.box {
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height: 50px;
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display: inline-block;
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zoom: 2;
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image-rendering: crisp-edges;
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}
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.green-box {
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width: 100px;
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background-position: -50px -16500px;
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}
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.repeat-box {
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width: 400px;
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background-position: 0px -16500px;
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background-repeat: repeat-x;
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}
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.image-background {
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}
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</style>
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<body>
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<div class="box green-box image-background"></div>
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<br>
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<div class="box repeat-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() {
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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.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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// Change the background of the elements.
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var elements = document.getElementsByClassName("image-background");
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if (window.internals && window.testRunner) {
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var promises = [];
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for (var index = 0; index < elements.length; ++index)
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promises.push(setElementImageBackground(elements[index], image));
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Promise.all(promises).then(() => {
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// Ensure internals.destroyDecodedDataForAllImages() will not destroy
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// the images' decoded data because it is inside the viewport.
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internals.destroyDecodedDataForAllImages();
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testRunner.notifyDone();
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});
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} else {
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for (var index = 0; index < elements.length; ++index)
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elements[index].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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