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import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

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Roy Tam 2018-01-19 03:59:58 +08:00
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dom/canvas/test/test_toDataURL_parameters.html Normal file
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<!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 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>
var canvas = document.getElementById('c');
var 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();
var pngData = canvas.toDataURL('image/png');
var pngQuality = canvas.toDataURL('image/png', 0.1);
is(pngQuality, pngData, "Quality is not supported for PNG images");
var data = canvas.toDataURL('image/jpeg');
if (data.match(/^data:image\/jpeg[;,]/)) {
// Test the JPEG quality parameter
var fullQuality = canvas.toDataURL('image/jpeg', 1.0);
var lowQuality = canvas.toDataURL('image/jpeg', 0.1);
isnot(lowQuality, fullQuality, "A low quality (0.1) should differ from high quality (1.0)");
var medQuality = canvas.toDataURL('image/jpeg', 0.5);
isnot(medQuality, fullQuality, "A medium quality (0.5) should differ from high (1.0)");
isnot(medQuality, lowQuality, "A medium quality (0.5) should differ from low (0.5)");
var tooHigh = canvas.toDataURL('image/jpeg', 2.0);
is(tooHigh, data, "Quality above 1.0 is treated as unspecified");
var tooLow = canvas.toDataURL('image/jpeg', -1.0);
is(tooLow, data, "Quality below 0.0 is treated as unspecified");
var lowQualityExtra = canvas.toDataURL('image/jpeg', 0.1, 'foo', 'bar', null);
is(lowQualityExtra, lowQuality, "Quality applies even if extra arguments are present");
var lowQualityUppercase = canvas.toDataURL('IMAGE/JPEG', 0.1);
is(lowQualityUppercase, lowQuality, "Quality applies to image/jpeg regardless of case");
var lowQualityString = canvas.toDataURL('image/jpeg', '0.1');
isnot(lowQualityString, lowQuality, "Quality must be a number (should not be a string)");
}
</script>