How can I increase size of CGContextRef after its creation.

```
if(UIGraphicsBeginImageContextWithOptions != NULL) {
    UIGraphicsBeginImageContextWithOptions(CGSizeMake(width, height), NO, 0);
}
else {
    UIGraphicsBeginImageContext(CGSizeMake(width, height));
}
CGContextRef ctr = UIGraphicsGetCurrentContext();

```

Can i change size of ctr?