Face switch

-(void) rebuildImage {

    //Get original image size
    float originalImageWidth = self.originalImage.size.width;
    float originalImageHeight = self.originalImage.size.height;

    //Get extracted image size
    float extractedImageWidth = self.extractionImage.size.width;
    float extractedImageHeight = self.extractionImage.size.height;

    //Calculate ratio
    float xRatio = originalImageWidth / extractedImageWidth;
    float yRatio = originalImageHeight / extractedImageHeight;

    //Begin context
    UIGraphicsBeginImageContext(CGSizeMake(originalImageWidth, originalImageHeight));
    CGContextRef context = UIGraphicsGetCurrentContext();

    //Draw original image
    [self.originalImage drawInRect:CGRectMake(0, 0, originalImageWidth, originalImageHeight) blendMode: kCGBlendModeNormal alpha: 1.0];

    //Get current face
    FaceView *theFace = [self.faceViews objectAtIndex: self.faceIndex];

    //Rotate image
    UIImage *rotatedImage = [self.originalImage imageRotatedByDegrees: theFace.extractionAngle  Anchor:CGPointMake(theFace.extractionAnchor.x * xRatio, theFace.extractionAnchor.y * yRatio)];

    //Face image
    UIImage *faceImage = [rotatedImage imageAtRect: CGRectMake(theFace.extractionFrame.origin.x * xRatio, theFace.extractionFrame.origin.y * yRatio, theFace.extractionFrame.size.width * xRatio, theFace.extractionFrame.size.height * yRatio)];

    //Draw faces
    for (int i=0; i<[self.faceViews count];i++) {
        //Get current and next
        FaceView *face = [self.faceViews objectAtIndex: i];

        //Mask image
        UIImage *maskImage = [UIImage imageNamed: [NSString stringWithFormat: @"Mask%i.png", face.maskIndex]];

        //Calculate masked face
        UIImage *maskedFace = [self getMaskedImage: faceImage MaskImage: maskImage];

        //Apply saturation, brightness, flip
        maskedFace = [Utilities staturateImage: maskedFace saturation: face.saturation];
        maskedFace = [Utilities brightnessImage: maskedFace brightness: face.brightness];

        //ALPHA BLENDING BUG HACK
        NSData *tempData = UIImagePNGRepresentation(maskedFace);
        maskedFace = [UIImage imageWithData:tempData];

        //Apply flip
        maskedFace = [UIImage imageWithCGImage: maskedFace.CGImage scale:1.0 orientation: face.flipped ? UIImageOrientationUpMirrored : UIImageOrientationUp];

        //Save context
        CGContextSaveGState(context);

        //Apply translation, rotation, scale
        CGContextTranslateCTM(context, (face.currentCenter.x - face.extractionOffsetX) * xRatio, (face.currentCenter.y - face.extractionOffsetY) * yRatio);
        CGContextRotateCTM(context, face.currentRotation);
        CGContextScaleCTM(context, face.currentScale, face.currentScale);

        //Draw image
        [maskedFace drawAtPoint:CGPointMake((-face.extractionFrame.size.width/2) * xRatio, (-face.extractionFrame.size.height/2) * yRatio) blendMode:kCGBlendModeNormal alpha: 1.0];

        //Restore context
        CGContextRestoreGState(context);
    }

    //Get result image
    self.finalImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    //Display final image
    self.backgroundImageView.image = self.finalImage;
}