lightest2.go

func (c LightestOperation) Result(images []containers.ImageContainer) (image.Image, error) {
	if len(images) == 0 {
		return nil, nil
	} else if len(images) == 1 {
		return images[0].GetImage(), nil
	}

	firstImage := images[0].GetImage()
	bounds := firstImage.Bounds()
	lightest := image.NewRGBA(image.Rect(0, 0, bounds.Dx(), bounds.Dy()))
	draw.Draw(lightest, bounds, firstImage, bounds.Min, draw.Src)

	for _, currentImageContainer := range images[1:] {
		currentImage := currentImageContainer.GetImage()
		if currentImage.Bounds() != bounds {
			return nil, errors.New("The images have different size!")
		}

		imageToCompare := image.NewRGBA(image.Rect(0, 0, bounds.Dx(), bounds.Dy()))
		draw.Draw(imageToCompare, bounds, currentImage, bounds.Min, draw.Src)
		c.getLightestImageBetweenTwo(lightest, imageToCompare)
	}

	return lightest, nil
}