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55 lines
2.2 KiB
HTML
55 lines
2.2 KiB
HTML
<!DOCTYPE HTML>
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<title>Canvas test: toDataURL parameters (Bug 564388)</title>
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<script src="/tests/SimpleTest/SimpleTest.js"></script>
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<link rel="stylesheet" href="/tests/SimpleTest/test.css">
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<body>
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<p>
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This test covers the JPEG quality parameter. If (when) the HTML5 spec changes the
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allowed parameters for ToDataURL, new tests should go here.
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</p>
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<canvas id="c" width="100" height="100"><p class="fallback">FAIL (fallback content)</p></canvas>
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<script>
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var canvas = document.getElementById('c');
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var ctx = canvas.getContext("2d");
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ctx.strokeStyle = '#FF0000';
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ctx.fillStyle = '#00FF00';
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ctx.fillRect(0, 0, 100, 100);
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ctx.beginPath();
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ctx.moveTo(10, 10);
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ctx.lineTo(90, 90);
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ctx.stroke();
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var pngData = canvas.toDataURL('image/png');
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var pngQuality = canvas.toDataURL('image/png', 0.1);
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is(pngQuality, pngData, "Quality is not supported for PNG images");
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var data = canvas.toDataURL('image/jpeg');
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if (data.match(/^data:image\/jpeg[;,]/)) {
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// Test the JPEG quality parameter
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var fullQuality = canvas.toDataURL('image/jpeg', 1.0);
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var lowQuality = canvas.toDataURL('image/jpeg', 0.1);
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isnot(lowQuality, fullQuality, "A low quality (0.1) should differ from high quality (1.0)");
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var medQuality = canvas.toDataURL('image/jpeg', 0.5);
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isnot(medQuality, fullQuality, "A medium quality (0.5) should differ from high (1.0)");
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isnot(medQuality, lowQuality, "A medium quality (0.5) should differ from low (0.5)");
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var tooHigh = canvas.toDataURL('image/jpeg', 2.0);
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is(tooHigh, data, "Quality above 1.0 is treated as unspecified");
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var tooLow = canvas.toDataURL('image/jpeg', -1.0);
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is(tooLow, data, "Quality below 0.0 is treated as unspecified");
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var lowQualityExtra = canvas.toDataURL('image/jpeg', 0.1, 'foo', 'bar', null);
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is(lowQualityExtra, lowQuality, "Quality applies even if extra arguments are present");
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var lowQualityUppercase = canvas.toDataURL('IMAGE/JPEG', 0.1);
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is(lowQualityUppercase, lowQuality, "Quality applies to image/jpeg regardless of case");
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var lowQualityString = canvas.toDataURL('image/jpeg', '0.1');
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isnot(lowQualityString, lowQuality, "Quality must be a number (should not be a string)");
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}
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</script>
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