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−//
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−//  UIImageExtra.m
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−//  HedgewarsMobile
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−//
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−//  Created by Vittorio on 08/04/10.
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−//  Copyright 2010 __MyCompanyName__. All rights reserved.
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−//
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−
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−#import "UIImageExtra.h"
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−
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−
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−@implementation UIImage (extra)
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− 
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−-(UIImage *)scaleToSize:(CGSize) size {
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−  // Create a bitmap graphics context
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−  // This will also set it as the current context
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−  UIGraphicsBeginImageContext(size);
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− 
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−  // Draw the scaled image in the current context
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−  [self drawInRect:CGRectMake(0, 0, size.width, size.height)];
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− 
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−  // Create a new image from current context
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−  UIImage* scaledImage = UIGraphicsGetImageFromCurrentImageContext();
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− 
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−  // Pop the current context from the stack
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−  UIGraphicsEndImageContext();
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− 
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−  // Return our new scaled image (autoreleased)
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−  return scaledImage;
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−}
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−
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−-(UIImage *)mergeWith:(UIImage *)secondImage atPoint:(CGPoint) secondImagePoint {
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−    // create a contex of size of the background image
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−    return [self mergeWith:secondImage atPoint:secondImagePoint atSize:self.size];
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−}
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−
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−-(UIImage *)mergeWith:(UIImage *)secondImage atPoint:(CGPoint) secondImagePoint atSize:(CGSize) resultingSize {
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−    UIGraphicsBeginImageContext(resultingSize);
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−    
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−    // drav the background image
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−    [self drawAtPoint:CGPointMake(0,0)];
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−    
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−    // draw the image on top of the first image
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−    [secondImage drawAtPoint:secondImagePoint];
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−    
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−    // create an image from the current contex (not thread safe)
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−    UIImage *resultImage = UIGraphicsGetImageFromCurrentImageContext();
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−    
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−    // free drawing contex
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−    UIGraphicsEndImageContext();
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−    
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−    // return the resulting autoreleased image
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−    return resultImage;
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−}
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−
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−-(id) initWithContentsOfFile:(NSString *)path andCutAt:(CGRect) rect {
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−    // load image from path
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−    UIImage *image = [[UIImage alloc] initWithContentsOfFile: path];
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−    
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−    if (nil != image) {
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−        // get its CGImage representation with a give size
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−        CGImageRef cgImgage = CGImageCreateWithImageInRect([image CGImage], rect);
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−    
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−        // clean memory
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−        [image release];
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−    
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−        // create a UIImage from the CGImage (memory must be allocated already)
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−        UIImage *sprite = [self initWithCGImage:cgImgage];
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−    
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−        // clean memory
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−        CGImageRelease(cgImgage);
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−
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−        // return resulting image
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−        return sprite;
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−    } else {
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−        NSLog(@"initWithContentsOfFile: andCutAt: FAILED");
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−        return nil;
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−    }
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−}
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−
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−-(UIImage *)convertImageToGrayScale:(UIImage *)image {
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−  // Create image rectangle with current image width/height
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−  CGRect imageRect = CGRectMake(0, 0, image.size.width, image.size.height);
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− 
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−  // Grayscale color space
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−  CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceGray();
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− 
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−  // Create bitmap content with current image size and grayscale colorspace
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−  CGContextRef context = CGBitmapContextCreate(nil, image.size.width, image.size.height, 8, 0, colorSpace, kCGImageAlphaNone);
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− 
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−  // Draw image into current context, with specified rectangle
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−  // using previously defined context (with grayscale colorspace)
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−  CGContextDrawImage(context, imageRect, [image CGImage]);
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− 
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−  // Create bitmap image info from pixel data in current context
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−  CGImageRef imageRef = CGBitmapContextCreateImage(context);
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− 
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−  // Create a new UIImage object  
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−  UIImage *newImage = [UIImage imageWithCGImage:imageRef];
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− 
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−  // Release colorspace, context and bitmap information
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−  CGColorSpaceRelease(colorSpace);
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−  CGContextRelease(context);
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−  CFRelease(imageRef);
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− 
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−  // Return the new grayscale image
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−  return newImage;
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−}
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− 
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−@end