2d.gradient.interpolate.alpha.html (1091B)
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>OffscreenCanvas test: 2d.gradient.interpolate.alpha</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 9 <h1>2d.gradient.interpolate.alpha</h1> 10 <p class="desc"></p> 11 12 13 <script> 14 var t = async_test(""); 15 var t_pass = t.done.bind(t); 16 var t_fail = t.step_func(function(reason) { 17 throw reason; 18 }); 19 t.step(function() { 20 21 var canvas = new OffscreenCanvas(100, 50); 22 var ctx = canvas.getContext('2d'); 23 24 ctx.fillStyle = '#ff0'; 25 ctx.fillRect(0, 0, 100, 50); 26 var g = ctx.createLinearGradient(0, 0, 100, 0); 27 g.addColorStop(0, 'rgba(0,0,255, 0)'); 28 g.addColorStop(1, 'rgba(0,0,255, 1)'); 29 ctx.fillStyle = g; 30 ctx.fillRect(0, 0, 100, 50); 31 _assertPixelApprox(canvas, 25,25, 191,191,63,255, 3); 32 _assertPixelApprox(canvas, 50,25, 127,127,127,255, 3); 33 _assertPixelApprox(canvas, 75,25, 63,63,191,255, 3); 34 t.done(); 35 36 }); 37 </script>