image cropping

This code is for cropping any image in any particular rectangle.

- (UIImage*) getSmallImageUIImage*) img
{
CGSize size = img.size;
CGFloat ratio = 0;
if (size.width < size.height) {
ratio = 36 / size.width;
} else {
ratio = 36 / size.height;
}
CGRect rect = CGRectMake(0.0, 0.0, ratio * size.width, ratio * size.height);

UIGraphicsBeginImageContext(rect.size);
[img drawInRect:rect];

UIImage *tempImg = [UIGraphicsGetImageFromCurrentImageContext() retain];
UIGraphicsEndImageContext();
return [tempImg autorelease];
}

- (UIImage*)imageByCroppingUIImage *)imageToCrop toRectCGRect)rect
{

//create a context to do our clipping in
UIGraphicsBeginImageContext(rect.size);
CGContextRef currentContext = UIGraphicsGetCurrentContext();

//create a rect with the size we want to crop the image to
//the X and Y here are zero so we start at the beginning of our
//newly created context

CGFloat X = (imageToCrop.size.width - rect.size.width)/2;
CGFloat Y = (imageToCrop.size.height - rect.size.height)/2;


CGRect clippedRect = CGRectMake(X, Y, rect.size.width, rect.size.height);
//CGContextClipToRect( currentContext, clippedRect);



//create a rect equivalent to the full size of the image
//offset the rect by the X and Y we want to start the crop
//from in order to cut off anything before them
CGRect drawRect = CGRectMake(0,
0,
imageToCrop.size.width,
imageToCrop.size.height);

CGContextTranslateCTM(currentContext, 0.0, drawRect.size.height);
CGContextScaleCTM(currentContext, 1.0, -1.0);
//draw the image to our clipped context using our offset rect
//CGContextDrawImage(currentContext, drawRect, imageToCrop.CGImage);


CGImageRef tmp = CGImageCreateWithImageInRect(imageToCrop.CGImage, clippedRect);

//pull the image from our cropped context
UIImage *cropped = [UIImage imageWithCGImage:tmp];//UIGraphicsGetImageFromCurrentImageContext();
CGImageRelease(tmp);
//pop the context to get back to the default
UIGraphicsEndImageContext();

//Note: this is autoreleased*/
return cropped;
}