aspect fit CGImage

+ (CGRect) aspectFittedRect:(CGRect)inRect max:(CGRect)maxRect
{
	float originalAspectRatio = inRect.size.width / inRect.size.height;
	float maxAspectRatio = maxRect.size.width / maxRect.size.height;

	CGRect newRect = maxRect;
	if (originalAspectRatio > maxAspectRatio) { // scale by width
		newRect.size.height = maxRect.size.height * inRect.size.height / inRect.size.width;
		newRect.origin.y += (maxRect.size.height - newRect.size.height)/2.0;
	} else {
		newRect.size.width = maxRect.size.height  * inRect.size.width / inRect.size.height;
		newRect.origin.x += (maxRect.size.width - newRect.size.width)/2.0;
	}

	return CGRectIntegral(newRect);
}