package system

import "io"
import "image"
import "git.tebibyte.media/tomo/tomo/canvas"

// System is coupled to a tomo.Backend implementation, and manages Hierarchies
// and Boxes.
type System struct {
	link BackendLink
}

// BackendLink allows the System to call up into the tomo.Backend implementation
// which contains it in order to do things such as create new textures.
type BackendLink interface {
	// NewTexture creates a new texture from an image.
	NewTexture (image.Image) canvas.TextureCloser
	// NewCanvas creates a new blank canvas with the specified bounds.
	NewCanvas  (image.Rectangle) canvas.Canvas
	// NewSurface creates a new surface with the specified bounds.
	NewSurface (image.Rectangle) (SurfaceLink, error)
}

// SurfaceLink wraps a Surface created by the backend implementation, allowing
// the System a higher level of control over it.
type SurfaceLink interface {
	io.Closer
	GetSurface () any
	SetSize    (image.Rectangle)
}

// New creates a new System.
func New (link BackendLink) *System {
	return &System {
		link: link,
	}
}