| <svg xmlns="http://www.w3.org/2000/svg" width="500" height="500"> |
| |
| <!-- It's unfortunately hard to reftest the extent of the blur. We can at |
| least make sure it paints *something* --> |
| |
| <filter id="f1" filterUnits="userSpaceOnUse" primitiveUnits="userSpaceOnUse"> |
| <feGaussianBlur in="SourceGraphic" stdDeviation="10"/> |
| </filter> |
| <g filter="url(#f1)"> |
| <rect x="100" y="100" width="100" height="100" fill="#00ff00"/> |
| </g> |
| |
| <!-- the radius affected by the box-blur is bounded by 3 times the standard |
| deviation --> |
| <rect x="0" y="0" width="300" height="130" fill="#ffffff"/> |
| <rect x="0" y="130" width="130" height="40" fill="#ffffff"/> |
| <rect x="170" y="130" width="130" height="40" fill="#ffffff"/> |
| <rect x="0" y="170" width="300" height="130" fill="#ffffff"/> |
| |
| <!-- we can test whether the blur is a reasonable size by bumping up |
| non-zero alpha values a lot --> |
| |
| <filter id="f2" filterUnits="userSpaceOnUse" primitiveUnits="userSpaceOnUse"> |
| <feGaussianBlur in="SourceGraphic" stdDeviation="10"/> |
| <feComponentTransfer> |
| <feFuncA type="linear" slope="1000"/> |
| </feComponentTransfer> |
| </filter> |
| <g filter="url(#f2)"> |
| <rect x="100" y="400" width="100" height="100" fill="#00ff00"/> |
| </g> |
| |
| <!-- there should be nonzero alpha values everywhere within 1 standard |
| deviation of the original image --> |
| <rect x="0" y="300" width="300" height="90" fill="#ffffff"/> |
| <rect x="0" y="390" width="90" height="120" fill="#ffffff"/> |
| <rect x="210" y="390" width="90" height="120" fill="#ffffff"/> |
| <rect x="0" y="510" width="300" height="90" fill="#ffffff"/> |
| |
| </svg> |