// Package area provides functions working with image areas.
package area

import (
	"fmt"
	"image"
)

// Size returns the size of the provided area.
func Size(area image.Rectangle) image.Point {
	return image.Point{
		area.Dx(),
		area.Dy(),
	}
}

// FromSize returns the corresponding area for the provided size.
func FromSize(size image.Point) (image.Rectangle, error) {
	if size.X < 0 || size.Y < 0 {
		return image.Rectangle{}, fmt.Errorf("cannot convert zero or negative size to an area, got: %+v", size)
	}
	return image.Rect(0, 0, size.X, size.Y), nil
}