| <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML//EN"> |
| <html> |
| <head> |
| <script src="../../resources/js-test-pre.js"></script> |
| </head> |
| <body> |
| <script> |
| description("Test the handling of negative sourceRect offset in getImageData()."); |
| |
| ctx = document.createElement('canvas').getContext('2d'); |
| |
| ctx.fillStyle = 'red'; |
| ctx.fillRect(0, 0, 100, 100); |
| ctx.fillStyle = 'green'; |
| ctx.fillRect(0, 0, 6, 6); |
| |
| var imageData = ctx.getImageData(-10, 0, 100, 1); |
| var imgdata = imageData.data; |
| |
| // Fully transparent black |
| shouldBe("imgdata[0]", "0"); |
| shouldBe("imgdata[1]", "0"); |
| shouldBe("imgdata[2]", "0"); |
| shouldBe("imgdata[3]", "0"); |
| |
| // Green |
| shouldBe("imgdata[60]", "0"); |
| shouldBe("imgdata[61]", "128"); |
| shouldBe("imgdata[62]", "0"); |
| shouldBe("imgdata[63]", "255"); |
| |
| // Red |
| shouldBe("imgdata[64]", "255"); |
| shouldBe("imgdata[65]", "0"); |
| shouldBe("imgdata[66]", "0"); |
| shouldBe("imgdata[67]", "255"); |
| </script> |
| <script src="../../resources/js-test-post.js"></script> |
| </body> |
| </html> |
