| <!DOCTYPE html> |
| <!-- DO NOT EDIT! This test has been generated by tools/gentest.py. --> |
| <title>OffscreenCanvas test: 2d.transformation.rotate.wrap</title> |
| <script src="/resources/testharness.js"></script> |
| <script src="/resources/testharnessreport.js"></script> |
| <script src="/2dcontext/resources/canvas-tests.js"></script> |
| |
| <h1>2d.transformation.rotate.wrap</h1> |
| <p class="desc">rotate() wraps large positive values correctly</p> |
| |
| |
| <script> |
| var t = async_test("rotate() wraps large positive values correctly"); |
| t.step(function() { |
| |
| var offscreenCanvas = new OffscreenCanvas(100, 50); |
| var ctx = offscreenCanvas.getContext('2d'); |
| |
| ctx.fillStyle = '#f00'; |
| ctx.fillRect(0, 0, 100, 50); |
| ctx.rotate(Math.PI * (1 + 4096)); // == pi (mod 2*pi) |
| // We need about pi +/- 0.001 in order to get correct-looking results |
| // 32-bit floats can store pi*4097 with precision 2^-10, so that should |
| // be safe enough on reasonable implementations |
| ctx.fillStyle = '#0f0'; |
| ctx.fillRect(-100, -50, 100, 50); |
| _assertPixel(offscreenCanvas, 50,25, 0,255,0,255, "50,25", "0,255,0,255"); |
| _assertPixel(offscreenCanvas, 98,2, 0,255,0,255, "98,2", "0,255,0,255"); |
| _assertPixel(offscreenCanvas, 98,47, 0,255,0,255, "98,47", "0,255,0,255"); |
| |
| t.done(); |
| |
| }); |
| </script> |
