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556e5abfa9
We are running into rasterization inaccuracies here. This test draws green circles on a green rectangle and assumes that the result will be solid green. Here's what happens with D2D: D2D computes coverage values in floating point so assume that we get a coverage of about 0.112399 or 0.112399*255 == 28.6 green (128/255 == 0.50196) is multiplied by the coverage to get 0.0564702 or .0564702*255 == 14.39 the results of the pixel shader get rounded before blending. So we get (r=0,g=14,b=0,a=29) blending this OVER green gives: 14+(255-29)*128/255 == 127 instead of 128. This doesn't happen with other backends because they typically use integer coverage amounts. We fix it by using ' ' instead of '.'
42 lines
802 B
HTML
42 lines
802 B
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<title>Pagination with Borders</title>
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<style type="text/css">
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.container {
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padding-bottom: 10px;
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border-bottom: 10px solid transparent;
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}
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.box {
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background: green;
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}
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p {
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font-size: 150px;
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line-height: 1;
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margin: 0;
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}
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p + p {
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height: 200px;
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}
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body {
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height: 200px;
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width: 300px;
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-moz-column-width: 150px;
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-moz-column-gap: 0;
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border: solid silver;
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border-style: none solid;
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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="container">
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<div class="box">
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<p> </p>
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<p> </p>
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</div>
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</div>
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</body>
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</html>
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