# Interface TileObserver

public interface TileObserver
An interface for objects that wish to be informed when tiles of a WritableRenderedImage become modifiable by some writer via a call to getWritableTile, and when they become unmodifiable via the last call to releaseWritableTile.

See Also:
  - `WritableRenderedImage`

## Method Summary

Modifier and Type
Method
Description
`void`
`tileUpdate(WritableRenderedImage source, int tileX, int tileY, boolean willBeWritable)`
A tile is about to be updated (it is either about to be grabbed for writing, or it is being released from writing).

## Method Details

### tileUpdate

void tileUpdate(WritableRenderedImage source, int tileX, int tileY, boolean willBeWritable)
A tile is about to be updated (it is either about to be grabbed for writing, or it is being released from writing).

Parameters:
  `source` - the image that owns the tile.
  `tileX` - the X index of the tile that is being updated.
  `tileY` - the Y index of the tile that is being updated.
  `willBeWritable` - If true, the tile will be grabbed for writing; otherwise it is being released.