2d.text.measure.actualBoundingBox.html (3377B)
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.actualBoundingBox</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.actualBoundingBox</h1> 18 <p class="desc">Testing actualBoundingBox</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 // Different platforms may render text slightly different. 38 // Values that are nominally expected to be zero might actually vary by a 39 // pixel or so if the UA accounts for antialiasing at glyph edges, so we 40 // allow a slight deviation. 41 _assert(Math.abs(ctx.measureText('A').actualBoundingBoxLeft) <= 1, "Math.abs(ctx.measureText('A').actualBoundingBoxLeft) <= 1"); 42 _assert(ctx.measureText('A').actualBoundingBoxRight >= 50, "ctx.measureText('A').actualBoundingBoxRight >= 50"); 43 _assert(ctx.measureText('A').actualBoundingBoxAscent >= 35, "ctx.measureText('A').actualBoundingBoxAscent >= 35"); 44 _assert(Math.abs(ctx.measureText('A').actualBoundingBoxDescent) <= 1, "Math.abs(ctx.measureText('A').actualBoundingBoxDescent) <= 1"); 45 46 _assert(ctx.measureText('D').actualBoundingBoxLeft >= 48, "ctx.measureText('D').actualBoundingBoxLeft >= 48"); 47 _assert(ctx.measureText('D').actualBoundingBoxLeft <= 52, "ctx.measureText('D').actualBoundingBoxLeft <= 52"); 48 _assert(ctx.measureText('D').actualBoundingBoxRight >= 75, "ctx.measureText('D').actualBoundingBoxRight >= 75"); 49 _assert(ctx.measureText('D').actualBoundingBoxRight <= 80, "ctx.measureText('D').actualBoundingBoxRight <= 80"); 50 _assert(ctx.measureText('D').actualBoundingBoxAscent >= 35, "ctx.measureText('D').actualBoundingBoxAscent >= 35"); 51 _assert(ctx.measureText('D').actualBoundingBoxAscent <= 40, "ctx.measureText('D').actualBoundingBoxAscent <= 40"); 52 _assert(ctx.measureText('D').actualBoundingBoxDescent >= 12, "ctx.measureText('D').actualBoundingBoxDescent >= 12"); 53 _assert(ctx.measureText('D').actualBoundingBoxDescent <= 15, "ctx.measureText('D').actualBoundingBoxDescent <= 15"); 54 55 _assert(Math.abs(ctx.measureText('ABCD').actualBoundingBoxLeft) <= 1, "Math.abs(ctx.measureText('ABCD').actualBoundingBoxLeft) <= 1"); 56 _assert(ctx.measureText('ABCD').actualBoundingBoxRight >= 200, "ctx.measureText('ABCD').actualBoundingBoxRight >= 200"); 57 _assert(ctx.measureText('ABCD').actualBoundingBoxAscent >= 85, "ctx.measureText('ABCD').actualBoundingBoxAscent >= 85"); 58 _assert(ctx.measureText('ABCD').actualBoundingBoxDescent >= 37, "ctx.measureText('ABCD').actualBoundingBoxDescent >= 37"); 59 60 }, "Testing actualBoundingBox"); 61 </script>