| // DO NOT EDIT! This test has been generated by /html/canvas/tools/gentest.py. |
| // OffscreenCanvas test in a worker:2d.composite.globalAlpha.range |
| // Description: |
| // Note: |
| |
| importScripts("/resources/testharness.js"); |
| importScripts("/html/canvas/resources/canvas-tests.js"); |
| |
| var t = async_test(""); |
| var t_pass = t.done.bind(t); |
| var t_fail = t.step_func(function(reason) { |
| throw reason; |
| }); |
| t.step(function() { |
| |
| var canvas = new OffscreenCanvas(100, 50); |
| var ctx = canvas.getContext('2d'); |
| |
| ctx.globalAlpha = 0.5; |
| // This may not set it to exactly 0.5 if it is rounded/quantised, so |
| // remember for future comparisons. |
| var a = ctx.globalAlpha; |
| _assertSame(ctx.globalAlpha, a, "ctx.globalAlpha", "a"); |
| ctx.globalAlpha = 1.1; |
| _assertSame(ctx.globalAlpha, a, "ctx.globalAlpha", "a"); |
| ctx.globalAlpha = -0.1; |
| _assertSame(ctx.globalAlpha, a, "ctx.globalAlpha", "a"); |
| ctx.globalAlpha = 0; |
| _assertSame(ctx.globalAlpha, 0, "ctx.globalAlpha", "0"); |
| ctx.globalAlpha = 1; |
| _assertSame(ctx.globalAlpha, 1, "ctx.globalAlpha", "1"); |
| t.done(); |
| }); |
| done(); |