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Diffstat (limited to 'testing/web-platform/tests/html/canvas/element/text/2d.text.drawing.style.letterSpacing.measure.html')
-rw-r--r-- | testing/web-platform/tests/html/canvas/element/text/2d.text.drawing.style.letterSpacing.measure.html | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/canvas/element/text/2d.text.drawing.style.letterSpacing.measure.html b/testing/web-platform/tests/html/canvas/element/text/2d.text.drawing.style.letterSpacing.measure.html new file mode 100644 index 0000000000..0e4848b6fe --- /dev/null +++ b/testing/web-platform/tests/html/canvas/element/text/2d.text.drawing.style.letterSpacing.measure.html @@ -0,0 +1,54 @@ +<!DOCTYPE html> +<!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. --> +<title>Canvas test: 2d.text.drawing.style.letterSpacing.measure</title> +<script src="/resources/testharness.js"></script> +<script src="/resources/testharnessreport.js"></script> +<script src="/html/canvas/resources/canvas-tests.js"></script> +<link rel="stylesheet" href="/html/canvas/resources/canvas-tests.css"> +<body class="show_output"> + +<h1>2d.text.drawing.style.letterSpacing.measure</h1> +<p class="desc">Testing letter spacing with different length units</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("Testing letter spacing with different length units"); +_addTest(function(canvas, ctx) { + + _assertSame(ctx.letterSpacing, '0px', "ctx.letterSpacing", "'0px'"); + _assertSame(ctx.wordSpacing, '0px', "ctx.wordSpacing", "'0px'"); + var width_normal = ctx.measureText('Hello World').width; + + function test_letter_spacing(value, difference_spacing, epsilon) { + ctx.letterSpacing = value; + _assertSame(ctx.letterSpacing, value, "ctx.letterSpacing", "value"); + _assertSame(ctx.wordSpacing, '0px', "ctx.wordSpacing", "'0px'"); + width_with_letter_spacing = ctx.measureText('Hello World').width; + assert_approx_equals(width_with_letter_spacing, width_normal + difference_spacing, epsilon, "letter spacing doesn't work."); + } + + // The first value is the letter Spacing to be set, the second value the + // change in length of string 'Hello World', note that there are 11 letters + // in 'hello world', so the length difference is always letterSpacing * 11. + // and the third value is the acceptable differencee for the length change, + // note that unit such as 1cm/1mm doesn't map to an exact pixel value. + test_cases = [['3px', 33, 0.1], + ['5px', 55, 0.1], + ['-2px', -22, 0.1], + ['1em', 110, 0.1], + ['-0.1em', -11, 0.1], + ['1in', 1056, 0.1], + ['-0.1cm', -41.65, 0.2], + ['-0.6mm', -24,95, 0.2]] + + for (const test_case of test_cases) { + test_letter_spacing(test_case[0], test_case[1], test_case[2]); + } + +}); +</script> + |