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products/Sources/formale Sprachen/C/Firefox/dom/canvas/test/ (Firefox Browser Version 136.0.1^©) Datei vom 10.2.2025 mit Größe 2 kB

test_toDataURL_parameters.html

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products/Sources/formale Sprachen/C/Firefox/dom/canvas/test/test_toDataURL_parameters.html

<!DOCTYPE HTML>
<title>Canvas test: toDataURL parameters (Bug 564388)</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" href="/tests/SimpleTest/test.css">
<body>
<p>
This test covers the JPEG and webp quality parameter. If (when) the HTML5 spec changes the
allowed parameters for ToDataURL, new tests should go here.
</p>
<canvas id="c" width="100" height="100"><p class="fallback">FAIL (fallback content)</p></canvas>
<script>
let canvas = document.getElementById('c');
let ctx = canvas.getContext("2d");

ctx.strokeStyle = '#FF0000';
ctx.fillStyle = '#00FF00';
ctx.fillRect(0, 0, 100, 100);
ctx.beginPath();
ctx.moveTo(10, 10);
ctx.lineTo(90, 90);
ctx.stroke();

let pngData = canvas.toDataURL('image/png');
let pngQuality = canvas.toDataURL('image/png', 0.1);
is(pngQuality, pngData, "Quality is not supported for PNG images");

function checkType(imagetype) {
    let imageTypeString = 'image/' + imagetype;
    let imageTypeUpperString = 'IMAGE/' + imagetype.toUpperCase();
    let data = canvas.toDataURL(imageTypeString);
    if (data.match(new RegExp('^data:image\/' + imagetype + '[;,]'))) {
        // Test the JPEG/wepb quality parameter

        let fullQuality = canvas.toDataURL(imageTypeString, 1.0);
        let lowQuality = canvas.toDataURL(imageTypeString, 0.1);
        isnot(lowQuality, fullQuality, "A low quality (0.1) should differ from high quality (1.0) " + imageTypeString);

        let medQuality = canvas.toDataURL(imageTypeString, 0.5);
        isnot(medQuality, fullQuality, "A medium quality (0.5) should differ from high (1.0) " + imageTypeString);
        isnot(medQuality, lowQuality, "A medium quality (0.5) should differ from low (0.5) " + imageTypeString);

        let tooHigh = canvas.toDataURL(imageTypeString, 2.0);
        is(tooHigh, data, "Quality above 1.0 is treated as unspecified " + imageTypeString);

        let tooLow = canvas.toDataURL(imageTypeString, -1.0);
        is(tooLow, data, "Quality below 0.0 is treated as unspecified " + imageTypeString);

        let lowQualityExtra = canvas.toDataURL(imageTypeString, 0.1, 'foo', 'bar', null);
        is(lowQualityExtra, lowQuality, "Quality applies even if extra arguments are present " + imageTypeString);

        let lowQualityUppercase = canvas.toDataURL(imageTypeUpperString, 0.1);
        is(lowQualityUppercase, lowQuality, "Quality applies to " + imageTypeString + " regardless of case");

        let lowQualityString = canvas.toDataURL(imageTypeString, '0.1');
        isnot(lowQualityString, lowQuality, "Quality must be a number (should not be a string) " + imageTypeString);
    } else {
        ok(false, "should get a data url " + imageTypeString);
    }
}

checkType('jpeg');
checkType('webp');
</script>

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