diff options
Diffstat (limited to 'testing/web-platform/tests/html/canvas/offscreen/text/2d.text.drawing.style.letterSpacing.measure.worker.js')
-rw-r--r-- | testing/web-platform/tests/html/canvas/offscreen/text/2d.text.drawing.style.letterSpacing.measure.worker.js | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/canvas/offscreen/text/2d.text.drawing.style.letterSpacing.measure.worker.js b/testing/web-platform/tests/html/canvas/offscreen/text/2d.text.drawing.style.letterSpacing.measure.worker.js new file mode 100644 index 0000000000..630bf1d486 --- /dev/null +++ b/testing/web-platform/tests/html/canvas/offscreen/text/2d.text.drawing.style.letterSpacing.measure.worker.js @@ -0,0 +1,50 @@ +// DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. +// OffscreenCanvas test in a worker:2d.text.drawing.style.letterSpacing.measure +// Description:Testing letter spacing with different length units +// Note: + +importScripts("/resources/testharness.js"); +importScripts("/html/canvas/resources/canvas-tests.js"); + +var t = async_test("Testing letter spacing with different length units"); +var t_pass = t.done.bind(t); +var t_fail = t.step_func(function(reason) { + throw reason; +}); +t.step(function() { + + var canvas = new OffscreenCanvas(100, 50); + var ctx = canvas.getContext('2d'); + + _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]); + } + t.done(); +}); +done(); |