IOverlayHandler (CustomNPC-Plus 1.11.1 API)

```
public interface IOverlayHandler
```
Manages skin overlays applied to an entity or player. Overlays are indexed by ID and rendered on top of the base skin.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`add(int id, ISkinOverlay overlay)`	Adds or replaces an overlay at the given ID.
`void`	`clear()`	Removes all overlays.
`ISkinOverlay`	`get(int id)`	Returns the overlay at the given ID.
`boolean`	`has(int id)`	Checks whether an overlay exists at the given ID.
`boolean`	`remove(int id)`	Removes the overlay at the given ID.
`int`	`size()`	Returns the number of active overlays.

- Method Detail
  - add
```
void add(int id,
         ISkinOverlay overlay)
```
    Adds or replaces an overlay at the given ID.
    
    Parameters:
    
    id - the overlay ID.
    
    overlay - the skin overlay to add.
  - get
```
ISkinOverlay get(int id)
```
    Returns the overlay at the given ID.
    
    Parameters:
    
    id - the overlay ID.
    
    Returns:
    
    the skin overlay, or null if not found.
  - has
```
boolean has(int id)
```
    Checks whether an overlay exists at the given ID.
    
    Parameters:
    
    id - the overlay ID.
    
    Returns:
    
    true if an overlay exists; false otherwise.
  - remove
```
boolean remove(int id)
```
    Removes the overlay at the given ID.
    
    Parameters:
    
    id - the overlay ID.
    
    Returns:
    
    true if an overlay was removed; false otherwise.
  - size
```
int size()
```
    Returns the number of active overlays.
    
    Returns:
    
    the overlay count.
  - clear
```
void clear()
```
    Removes all overlays.