59 lines
1.5 KiB
HTML
59 lines
1.5 KiB
HTML
<!DOCTYPE HTML>
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<html>
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<head>
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<script src="/tests/SimpleTest/SimpleTest.js"></script>
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<script src="/tests/SimpleTest/EventUtils.js"></script>
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<link rel="stylesheet" href="/tests/SimpleTest/test.css"/>
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</head>
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<body>
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<style>
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.box {
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background: linear-gradient(90deg, rgba(256,0,0,1), rgba(256,0,0,1));
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background-attachment: fixed;
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width: 25%;
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height: 450px;
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}
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</style>
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<div style="height: 1000vh;"></div>
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<div class="box"></div>
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<script>
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SimpleTest.waitForExplicitFinish();
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add_task(async function() {
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let utils = SpecialPowers.DOMWindowUtils;
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let sc = document.getElementById("sc");
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let boundingClientRect = document.documentElement.getBoundingClientRect();
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let canvas = document.createElement("canvas");
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canvas.setAttribute("width", boundingClientRect.width);
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canvas.setAttribute("height", boundingClientRect.height);
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let ctx = canvas.getContext("2d");
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let rect = new window.DOMRect(boundingClientRect.x, boundingClientRect.y,
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boundingClientRect.width,
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boundingClientRect.height);
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let image = await SpecialPowers.snapshotContext(window, rect, "rgb(255,255,255)");
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SpecialPowers.wrap(ctx).drawImage(image, 0, 0);
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var data = ctx.getImageData(0, 0, boundingClientRect.width, boundingClientRect.height).data;
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var foundRed = false;
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for (var i = 0; i < data.length; i+=4) {
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if (data[i] == 255 && data[i+1] == 0 && data[i+2] == 0 && data[i+3] == 255) {
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foundRed = true;
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break;
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}
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}
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ok(foundRed, "found some red pixels");
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});
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</script>
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</body>
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</html>
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