Related issue: #31528

Description

For mobile and performance restricted use cases it would be nice to have a more simple and fast blur.

The presented box blur approach is in some sense the simplest thing you can do to produce a blur. It use just a single pass and can produce a usable blur with just 25 taps. Since there is a separate parameter called separation, you can control the spread of the blur without changing the number of samples. As you can see below the result is more blocky but less taxing than Gaussian.