| 45 | } |
| 46 | |
| 47 | fn transform_value(&self, value: f64) -> Option<f64> { |
| 48 | match self { |
| 49 | Self::Identity => value.is_finite().then_some(value), |
| 50 | Self::Affine { scale, translate } => { |
| 51 | if !(value.is_finite() && scale.is_finite() && translate.is_finite()) { |
| 52 | return None; |
| 53 | } |
| 54 | let out = value.mul_add(*scale, *translate); |
| 55 | out.is_finite().then_some(out) |
| 56 | } |
| 57 | Self::Log { base } => { |
| 58 | if !(value.is_finite() && value > 0.0 && valid_log_base(*base)) { |
| 59 | return None; |
| 60 | } |
| 61 | let out = value.log(*base); |
| 62 | out.is_finite().then_some(out) |
| 63 | } |
| 64 | Self::Exp { base } => { |
| 65 | if !(value.is_finite() && valid_log_base(*base)) { |
| 66 | return None; |
| 67 | } |
| 68 | let out = base.powf(value); |
| 69 | (out.is_finite() && out > 0.0).then_some(out) |
| 70 | } |
| 71 | Self::Then(first, second) => second.transform_value(first.transform_value(value)?), |
| 72 | } |
| 73 | } |
| 74 | |
| 75 | fn inverted(&self) -> Option<Self> { |
| 76 | match self { |