| <!DOCTYPE html> |
| <title>Canvas test: 2d.composite.globalAlpha.range</title> |
| <script src="../tests.js"></script> |
| <link rel="stylesheet" href="../tests.css"> |
| <body> |
| <p id="passtext">Pass</p> |
| <p id="failtext">Fail</p> |
| <p class="output">These images should be identical:</p> |
| <canvas id="c" class="output" width="100" height="50"><p class="fallback">FAIL (fallback content)</p></canvas> |
| |
| <ul id="d"></ul> |
| <script> |
| _addTest(function(canvas, ctx) { |
| |
| ctx.globalAlpha = 0.5; |
| var a = ctx.globalAlpha; // might not be exactly 0.5, if it is rounded/quantised, so remember for future comparisons |
| ctx.globalAlpha = 1.1; |
| _assertEqual(ctx.globalAlpha, a, "ctx.globalAlpha", "a"); |
| ctx.globalAlpha = -0.1; |
| _assertEqual(ctx.globalAlpha, a, "ctx.globalAlpha", "a"); |
| ctx.globalAlpha = 0; |
| _assertEqual(ctx.globalAlpha, 0, "ctx.globalAlpha", "0"); |
| ctx.globalAlpha = 1; |
| _assertEqual(ctx.globalAlpha, 1, "ctx.globalAlpha", "1"); |
| |
| |
| }); |
| </script> |
| |
