| <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN"> |
| <html> |
| <head> |
| <script src="../../resources/js-test-pre.js"></script> |
| </head> |
| <body> |
| <script> |
| description("Series of tests to ensure correct behavior of canvas.clearRect()."); |
| var ctx = document.createElement('canvas').getContext('2d'); |
| |
| // Clear rect with height = width = 0. |
| debug("Test canvas.clearRect() with height = width = 0."); |
| ctx.fillStyle = 'red'; |
| ctx.fillRect(0, 0, 1, 1); |
| ctx.clearRect(0, 0, 0, 0); |
| |
| var imageData = ctx.getImageData(0, 0, 1, 1); |
| var imgdata = imageData.data; |
| shouldBe("imgdata[0]", "255"); |
| shouldBe("imgdata[1]", "0"); |
| shouldBe("imgdata[2]", "0"); |
| |
| ctx.clearRect(0, 0, 1, 1); |
| |
| // Clear rect with height = 0, width = 1. |
| debug("Test canvas.clearRect() with height = 0, width = 1."); |
| ctx.fillStyle = 'red'; |
| ctx.fillRect(0, 0, 1, 1); |
| ctx.clearRect(0, 0, 1, 0); |
| |
| var imageData = ctx.getImageData(0, 0, 1, 1); |
| var imgdata = imageData.data; |
| shouldBe("imgdata[0]", "255"); |
| shouldBe("imgdata[1]", "0"); |
| shouldBe("imgdata[2]", "0"); |
| |
| ctx.clearRect(0, 0, 1, 1); |
| |
| // Clear rect with height = 1, width = 0. |
| debug("Test canvas.clearRect() with height = 1, width = 0."); |
| ctx.fillStyle = 'red'; |
| ctx.fillRect(0, 0, 1, 1); |
| ctx.clearRect(0, 0, 0, 1); |
| |
| var imageData = ctx.getImageData(0, 0, 1, 1); |
| var imgdata = imageData.data; |
| shouldBe("imgdata[0]", "255"); |
| shouldBe("imgdata[1]", "0"); |
| shouldBe("imgdata[2]", "0"); |
| |
| ctx.clearRect(0, 0, 1, 1); |
| </script> |
| <script src="../../resources/js-test-post.js"></script> |
| </body> |
| </html> |
