| Flutter Impeller |

Classes | Namespaces | Variables
sigma.h File Reference
`#include "impeller/geometry/scalar.h"`

Go to the source code of this file.

## Classes
struct | impeller::Sigma
| In filters that use Gaussian distributions, "sigma" is a size of one standard deviation in terms of the local space pixel grid of the filter input. In other words, this determines how wide the distribution stretches. More...
struct | impeller::Radius
| For convolution filters, the "radius" is the size of the convolution kernel to use on the local space pixel grid of the filter input. For Gaussian blur kernels, this unit has a linear relationship with `Sigma`. See `kKernelRadiusPerSigma` for details on how this relationship works. More...

## Namespaces
| impeller

## Variables
constexpr static float | impeller::kKernelRadiusPerSigma = 1.73205080757