| <!DOCTYPE html> |
| <title>Canvas test: 2d.state.saverestore.globalAlpha</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) { |
| |
| // Test that restore() undoes any modifications |
| var old = ctx.globalAlpha; |
| ctx.save(); |
| ctx.globalAlpha = 0.5; |
| ctx.restore(); |
| _assertSame(ctx.globalAlpha, old, "ctx.globalAlpha", "old"); |
| |
| // Also test that save() doesn't modify the values |
| ctx.globalAlpha = 0.5; |
| old = ctx.globalAlpha; |
| // we're not interested in failures caused by get(set(x)) != x (e.g. |
| // from rounding), so compare against 'old' instead of against 0.5 |
| ctx.save(); |
| _assertSame(ctx.globalAlpha, old, "ctx.globalAlpha", "old"); |
| ctx.restore(); |
| |
| |
| }); |
| </script> |
| |
