Enum ChangeSource 

pub enum ChangeSource<'a> {
    Diff {
        result: &'a DiffResult,
        output: &'a Image,
    },
    Ssim {
        outcome: &'a SsimOutcome,
        floor: f32,
    },
    Regions(&'a [BoundingBox]),
}

Where the change information came from.

Each variant is what one of the producers hands back, taken by name: this crate sits above them and consumes their results, rather than either of them depending on it. What differs between the variants is only the precision of the description, and whether it needs refining.

Variants

Diff

What [blazediff::diff] returns: its result plus the visualization it wrote. Changed pixels are the non-grayscale ones, so the mask is exact and is used as-is; the counts come from the diff rather than being recomputed, because it knows which pixels it excluded as anti-aliasing.

The diff must have been run with mask_options so the visualization is readable as a mask whatever colours the caller wanted.

Fields

result: &'a DiffResult

output: &'a Image

Ssim

What any blazediff_ssim metric returns. Cells scoring below floor are changed. The map’s grid is coarser than a pixel, so the boxes it yields are refined against the source pixels before anything is measured.

Fields

outcome: &'a SsimOutcome

floor: f32

Regions(&'a [BoundingBox])

Regions the caller already knows — DOM rectangles, a crop list, anything. Refined like a score map, so they may be as coarse as you like.