2d.text.drawing.style.letterSpacing.change.font.worker.js (1861B)
1 // DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. 2 // OffscreenCanvas test in a worker:2d.text.drawing.style.letterSpacing.change.font 3 // Description:Set letter spacing and word spacing to font dependent value and verify it works after font change. 4 // Note: 5 6 importScripts("/resources/testharness.js"); 7 importScripts("/html/canvas/resources/canvas-tests.js"); 8 9 var t = async_test("Set letter spacing and word spacing to font dependent value and verify it works after font change."); 10 var t_pass = t.done.bind(t); 11 var t_fail = t.step_func(function(reason) { 12 throw reason; 13 }); 14 t.step(function() { 15 16 var canvas = new OffscreenCanvas(100, 50); 17 var ctx = canvas.getContext('2d'); 18 19 _assertSame(ctx.letterSpacing, '0px', "ctx.letterSpacing", "'0px'"); 20 _assertSame(ctx.wordSpacing, '0px', "ctx.wordSpacing", "'0px'"); 21 // Get the width for 'Hello World' at default size, 10px. 22 var width_normal = ctx.measureText('Hello World').width; 23 24 ctx.letterSpacing = '1em'; 25 _assertSame(ctx.letterSpacing, '1em', "ctx.letterSpacing", "'1em'"); 26 // 1em = 10px. Add 10px after each letter in "Hello World", 27 // makes it 110px longer. 28 var width_with_spacing = ctx.measureText('Hello World').width; 29 assert_approx_equals(width_with_spacing, width_normal + 110, 0.1, "letter-spacing error"); 30 31 // Changing font to 20px. Without resetting the spacing, 1em letterSpacing 32 // is now 20px, so it's suppose to be 220px longer without any letterSpacing set. 33 ctx.font = '20px serif'; 34 width_with_spacing = ctx.measureText('Hello World').width; 35 // Now calculate the reference spacing for "Hello World" with no spacing. 36 ctx.letterSpacing = '0em'; 37 width_normal = ctx.measureText('Hello World').width; 38 assert_approx_equals(width_with_spacing, width_normal + 220, 0.1, "letter-spacing error after font change"); 39 t.done(); 40 }); 41 done();