Quelle cicp-chunk.html Sprache: HTML

products/Sources/formale Sprachen/C/Firefox/testing/web-platform/tests/png/cicp-chunk.html

<!DOCTYPE html>
<title>PNG test: cICP chunk</title>
<link rel="help" href="https://w3c.github.io/PNG-spec/#cICP-chunk">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/html/canvas/resources/canvas-tests.js"></script>
<body>

<h1>cICP chunk</h1>
<p class="desc">test pixel values of a display-p3 PNG</p>

<p class="output">Actual output:</p>
<canvas id="c" class="output" width="100" height="50"><p class="fallback">FAIL (fallback content)</p></canvas>

<ul id="d"></ul>
<script>
var t = async_test("test pixel values of a display-p3 PNG");
const img = new Image();
img.onload = () => {
  _addTest(function(canvas, ctx) {
    ctx.drawImage(img, 0, 0);

    var pixel = ctx.getImageData(5, 5, 1, 1, {colorSpace: "srgb", storageFormat: "uint8"}).data;

    // The pixel values stored are (51 red, 102 green, 153 blue).
    // These numbers are chosen because 0.2 * 255 = 51.
    // The image has a cICP chunk indicating the Display P3 color space.
    // This results in decoded pixel values of (27 red, 104 green, 157 blue).
    const pixel_expected = [27, 104, 157, 255];
    const epsilon = 2;

    _assertSame(pixel.length, pixel_expected.length, "pixel.length", "pixel_expected.length");
    assert_approx_equals(pixel[0], pixel_expected[0], epsilon);
    assert_approx_equals(pixel[1], pixel_expected[1], epsilon);
    assert_approx_equals(pixel[2], pixel_expected[2], epsilon);
    assert_approx_equals(pixel[3], pixel_expected[3], epsilon);
  }, {colorSpace: "display-p3"});
};
img.src = "support/cicp-display-p3.png";
</script>

Messung V0.5

¤ Dauer der Verarbeitung: 0.2 Sekunden ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung und die Messung sind noch experimentell.