pub fn scale_alpha_to_original_coverage(
src: &Image<'_, AlbedoFormat>,
downsampled: &Image<'_, AlbedoFormat>,
alpha_cutoff: Option<f32>,
) -> Vec<u8> ⓘExpand description
Scales the alpha to the downscaled texture to preserve the overall alpha coverage.
If alpha cutoff is specified, any alpha value above it is considered visible of which the percentage of visible texels will be. Otherwise, visibility is considered a linear sum of the alpha values instead and the source and target alpha coverage are calculated the same way.