<!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>