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32 lines
1.2 KiB
HTML
32 lines
1.2 KiB
HTML
<!DOCTYPE html>
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<!-- DO NOT EDIT! This test has been generated by tools/gentest.py. -->
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<title>OffscreenCanvas test: 2d.imageData.create2.large</title>
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<script src="/common/canvas-tests.js"></script>
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<h1>2d.imageData.create2.large</h1>
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<p class="desc">createImageData(sw, sh) works for sizes much larger than the canvas</p>
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<script>
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var t = async_test("createImageData(sw, sh) works for sizes much larger than the canvas");
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t.step(function() {
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var offscreenCanvas = new OffscreenCanvas(100, 50);
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var ctx = offscreenCanvas.getContext('2d');
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var imgdata = ctx.createImageData(1000, 2000);
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_assertSame(imgdata.data.length, imgdata.width*imgdata.height*4, "imgdata.data.length", "imgdata.width*imgdata.height*4");
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_assert(imgdata.width < imgdata.height, "imgdata.width < imgdata.height");
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_assert(imgdata.width > 0, "imgdata.width > 0");
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var isTransparentBlack = true;
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for (var i = 0; i < imgdata.data.length; i += 7813) // check ~1024 points (assuming normal scaling)
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if (imgdata.data[i] !== 0)
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isTransparentBlack = false;
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_assert(isTransparentBlack, "isTransparentBlack");
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t.done();
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});
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</script>
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