| <!DOCTYPE html> |
| <!-- DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. --> |
| <meta charset="UTF-8"> |
| <title>OffscreenCanvas test: 2d.text.measure.index-from-offset-edge-cases.tentative</title> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="/html/canvas/resources/canvas-tests.js"></script> |
| |
| <h1>2d.text.measure.index-from-offset-edge-cases.tentative</h1> |
| <p class="desc">Test the edge cases for getIndexFromOffset, where the point is at the edge of glyph and at the midpoint.</p> |
| |
| |
| <script> |
| promise_test(async t => { |
| |
| var canvas = new OffscreenCanvas(100, 50); |
| var ctx = canvas.getContext('2d'); |
| |
| var f = new FontFace("CanvasTest", "url('/fonts/CanvasTest.ttf')"); |
| f.load(); |
| document.fonts.add(f); |
| await document.fonts.ready; |
| ctx.font = '50px CanvasTest'; |
| ctx.direction = 'ltr'; |
| ctx.align = 'left' |
| ctx.baseline = 'alphabetic' |
| tm = ctx.measureText('A'); |
| const a_width = tm.width; |
| tm = ctx.measureText('B'); |
| const b_width = tm.width; |
| tm = ctx.measureText('C'); |
| const c_width = tm.width; |
| const epsilon = 1.0e-4; |
| |
| tm = ctx.measureText('ABC'); |
| _assert(tm.getIndexFromOffset(0) == 0, "tm.getIndexFromOffset(0) == 0"); |
| _assert(tm.getIndexFromOffset(a_width / 2) == 0, "tm.getIndexFromOffset(a_width / 2) == 0"); |
| _assert(tm.getIndexFromOffset(a_width / 2 + 1) == 1, "tm.getIndexFromOffset(a_width / 2 + 1) == 1"); |
| _assert(tm.getIndexFromOffset(a_width) == 1, "tm.getIndexFromOffset(a_width) == 1"); |
| _assert(tm.getIndexFromOffset(a_width + b_width / 2) == 1, "tm.getIndexFromOffset(a_width + b_width / 2) == 1"); |
| _assert(tm.getIndexFromOffset(a_width + b_width / 2 + 1) == 2, "tm.getIndexFromOffset(a_width + b_width / 2 + 1) == 2"); |
| _assert(tm.getIndexFromOffset(a_width + b_width) == 2, "tm.getIndexFromOffset(a_width + b_width) == 2"); |
| _assert(tm.getIndexFromOffset(a_width + b_width + c_width / 2) == 2, "tm.getIndexFromOffset(a_width + b_width + c_width / 2) == 2"); |
| _assert(tm.getIndexFromOffset(a_width + b_width + c_width / 2 + 1) == 3, "tm.getIndexFromOffset(a_width + b_width + c_width / 2 + 1) == 3"); |
| _assert(tm.getIndexFromOffset(a_width + b_width + c_width) == 3, "tm.getIndexFromOffset(a_width + b_width + c_width) == 3"); |
| |
| }, "Test the edge cases for getIndexFromOffset, where the point is at the edge of glyph and at the midpoint."); |
| </script> |
