imagediff

type DimensionMismatchError struct {
	Expected image.Point
	Actual   image.Point
}

type Metrics struct {
	// Width and Height are the comparison-canvas dimensions. ExpectedWidth,
	// ExpectedHeight, ActualWidth, and ActualHeight retain the source sizes so a
	// crop regression still produces a useful report instead of a nil Result.
	Width          int
	Height         int
	ExpectedWidth  int
	ExpectedHeight int
	ActualWidth    int
	ActualHeight   int

	ChangedPixels   int
	MaxChannelDelta int
	RMSE            float64
}

type MismatchError struct {
	Metrics   Metrics
	Tolerance Tolerance
}

type Options struct {
	Tolerance    Tolerance
	ExpectedName string
	ActualName   string
}

type Result struct {
	Metrics   Metrics
	Tolerance Tolerance
	Passed    bool

	ExpectedPNG []byte
	ActualPNG   []byte
	OverlayPNG  []byte
	HeatmapPNG  []byte
	ReportHTML  []byte
}

type Tolerance struct {
	MaxChangedPixels int
	MaxChannelDelta  int
	MaxRMSE          float64
}