diff

type Calculator interface {
	// CalculateDiffs recomputes all diffs for the current grouping, including any digests provided.
	CalculateDiffs(ctx context.Context, grouping paramtools.Params, additional []types.Digest) error
}

type DiffMetrics struct {
	// NumDiffPixels is the absolute number of pixels that are different.
	NumDiffPixels int

	// CombinedMetric is a value in [0, 10] that represents how large the diff is between two
	// images. It is based off the MaxRGBADiffs and PixelDiffPercent.
	CombinedMetric float32

	// PixelDiffPercent is the percentage of pixels that are different. The denominator here is
	// (maximum width of the two images) * (maximum height of the two images).
	PixelDiffPercent float32

	// MaxRGBADiffs contains the maximum difference of each channel.
	MaxRGBADiffs [4]int

	// DimDiffer is true if the dimensions between the two images are different.
	DimDiffer bool
}