This method extracts an area of the pixmap and returns it as a new pixmap.
| Parameter | Description |
|---|---|
| (x, y) | position of the extracted area |
| (width, height) | dimensions of the extracted area |
Returns a new Pixmap object if successful, otherwise NULL is returned.
If the extracted area lies outside the bounds of the pixmap then NULL will be returned.
If the pixmap uses a compressed format and the position and dimensions of the extracted area are not evenly divisible by the block size then NULL will be returned.