62 lines
2.2 KiB
HTML
62 lines
2.2 KiB
HTML
<!DOCTYPE html>
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<html>
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<style>
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.box {
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width: 300px;
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height: 300px;
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}
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.image-background {
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background-position: -300px 0px;
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}
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@media (-webkit-min-device-pixel-ratio: 2) {
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.box {
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width: 150px;
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height: 150px;
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}
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.image-background {
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background-position: -150px 0px;
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background-size: 450px, 150px;
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}
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}
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</style>
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<body>
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<div class="box image-background"></div>
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<script>
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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 element.
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var element = document.getElementsByClassName("image-background")[0];
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element.style.backgroundImage = 'url(' + image.src + ')';
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if (window.internals && window.testRunner) {
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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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// Wait for the image frame to finish decoding before finishing the test.
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element.addEventListener("webkitImageFrameReady", function() {
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// Ensure internals.destroyDecodedDataForAllImages() will not destroy
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// the image's decoded data because it is inside the viewport.
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internals.destroyDecodedDataForAllImages();
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testRunner.notifyDone();
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}, false);
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}
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}
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image.src = "resources/red-green-blue-900-300.png";
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})();
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</script>
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</body>
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</html>
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