//

//  UIImageExtra.m

//  HedgewarsMobile

//

//  Created by Vittorio on 08/04/10.

//  Copyright 2010 __MyCompanyName__. All rights reserved.

//

#import "UIImageExtra.h"

@implementation UIImage (extra)

-(UIImage *)scaleToSize:(CGSize) size {

  // Create a bitmap graphics context

  // This will also set it as the current context

  UIGraphicsBeginImageContext(size);

  // Draw the scaled image in the current context

  [self drawInRect:CGRectMake(0, 0, size.width, size.height)];

  // Create a new image from current context

  UIImage* scaledImage = UIGraphicsGetImageFromCurrentImageContext();

  // Pop the current context from the stack

  UIGraphicsEndImageContext();

  // Return our new scaled image (autoreleased)

  return scaledImage;

}

-(UIImage *)mergeWith:(UIImage *)secondImage atPoint:(CGPoint) secondImagePoint {

    // create a contex of size of the background image

    return [self mergeWith:secondImage atPoint:secondImagePoint atSize:self.size];

}

-(UIImage *)mergeWith:(UIImage *)secondImage atPoint:(CGPoint) secondImagePoint atSize:(CGSize) resultingSize {

    UIGraphicsBeginImageContext(resultingSize);

    // drav the background image

    [self drawAtPoint:CGPointMake(0,0)];

    // draw the image on top of the first image

    [secondImage drawAtPoint:secondImagePoint];

    // create an image from the current contex (not thread safe)

    UIImage *resultImage = UIGraphicsGetImageFromCurrentImageContext();

    // free drawing contex

    UIGraphicsEndImageContext();

    // return the resulting autoreleased image

    return resultImage;

}

-(id) initWithContentsOfFile:(NSString *)path andCutAt:(CGRect) rect {

    // load image from path

    UIImage *image = [[UIImage alloc] initWithContentsOfFile: path];

    if (nil != image) {

        // get its CGImage representation with a give size

        CGImageRef cgImgage = CGImageCreateWithImageInRect([image CGImage], rect);

        // clean memory

        [image release];

        // create a UIImage from the CGImage (memory must be allocated already)

        UIImage *sprite = [self initWithCGImage:cgImgage];

        // clean memory

        CGImageRelease(cgImgage);

        // return resulting image

        return sprite;

    } else {

        NSLog(@"initWithContentsOfFile: andCutAt: FAILED");

        return nil;

    }

}

-(UIImage *)convertImageToGrayScale:(UIImage *)image {

  // Create image rectangle with current image width/height

  CGRect imageRect = CGRectMake(0, 0, image.size.width, image.size.height);

  // Grayscale color space

  CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceGray();

  // Create bitmap content with current image size and grayscale colorspace

  CGContextRef context = CGBitmapContextCreate(nil, image.size.width, image.size.height, 8, 0, colorSpace, kCGImageAlphaNone);

  // Draw image into current context, with specified rectangle

  // using previously defined context (with grayscale colorspace)

  CGContextDrawImage(context, imageRect, [image CGImage]);

  // Create bitmap image info from pixel data in current context

  CGImageRef imageRef = CGBitmapContextCreateImage(context);

  // Create a new UIImage object  

  UIImage *newImage = [UIImage imageWithCGImage:imageRef];

  // Release colorspace, context and bitmap information

  CGColorSpaceRelease(colorSpace);

  CGContextRelease(context);

  CFRelease(imageRef);

  // Return the new grayscale image

  return newImage;

}

@end