2d.text.measure.index-from-offset-edge-cases.tentative.html (2735B)
1 <!DOCTYPE html> 2 <!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. --> 3 <meta charset="UTF-8"> 4 <title>Canvas test: 2d.text.measure.index-from-offset-edge-cases.tentative</title> 5 <script src="/resources/testharness.js"></script> 6 <script src="/resources/testharnessreport.js"></script> 7 <script src="/html/canvas/resources/canvas-tests.js"></script> 8 <link rel="stylesheet" href="/html/canvas/resources/canvas-tests.css"> 9 <style> 10 @font-face { 11 font-family: CanvasTest; 12 src: url("/fonts/CanvasTest.ttf"); 13 } 14 </style> 15 <body class="show_output"> 16 17 <h1>2d.text.measure.index-from-offset-edge-cases.tentative</h1> 18 <p class="desc">Test the edge cases for getIndexFromOffset, where the point is at the edge of glyph and at the midpoint.</p> 19 20 21 <span style="font-family: CanvasTest; position: absolute; visibility: hidden">A</span> 22 <p class="output">Actual output:</p> 23 <canvas id="c" class="output" width="100" height="50"><p class="fallback">FAIL (fallback content)</p></canvas> 24 25 <ul id="d"></ul> 26 <script> 27 promise_test(async t => { 28 29 var canvas = document.getElementById('c'); 30 var ctx = canvas.getContext('2d'); 31 32 await document.fonts.ready; 33 ctx.font = '50px CanvasTest'; 34 ctx.direction = 'ltr'; 35 ctx.align = 'left' 36 ctx.baseline = 'alphabetic' 37 tm = ctx.measureText('A'); 38 const a_width = tm.width; 39 tm = ctx.measureText('B'); 40 const b_width = tm.width; 41 tm = ctx.measureText('C'); 42 const c_width = tm.width; 43 const epsilon = 1.0e-4; 44 45 tm = ctx.measureText('ABC'); 46 _assert(tm.getIndexFromOffset(0) == 0, "tm.getIndexFromOffset(0) == 0"); 47 _assert(tm.getIndexFromOffset(a_width / 2) == 0, "tm.getIndexFromOffset(a_width / 2) == 0"); 48 _assert(tm.getIndexFromOffset(a_width / 2 + 1) == 1, "tm.getIndexFromOffset(a_width / 2 + 1) == 1"); 49 _assert(tm.getIndexFromOffset(a_width) == 1, "tm.getIndexFromOffset(a_width) == 1"); 50 _assert(tm.getIndexFromOffset(a_width + b_width / 2) == 1, "tm.getIndexFromOffset(a_width + b_width / 2) == 1"); 51 _assert(tm.getIndexFromOffset(a_width + b_width / 2 + 1) == 2, "tm.getIndexFromOffset(a_width + b_width / 2 + 1) == 2"); 52 _assert(tm.getIndexFromOffset(a_width + b_width) == 2, "tm.getIndexFromOffset(a_width + b_width) == 2"); 53 _assert(tm.getIndexFromOffset(a_width + b_width + c_width / 2) == 2, "tm.getIndexFromOffset(a_width + b_width + c_width / 2) == 2"); 54 _assert(tm.getIndexFromOffset(a_width + b_width + c_width / 2 + 1) == 3, "tm.getIndexFromOffset(a_width + b_width + c_width / 2 + 1) == 3"); 55 _assert(tm.getIndexFromOffset(a_width + b_width + c_width) == 3, "tm.getIndexFromOffset(a_width + b_width + c_width) == 3"); 56 57 }, "Test the edge cases for getIndexFromOffset, where the point is at the edge of glyph and at the midpoint."); 58 </script>