1 //

     2 //  UIImageExtra.m

     3 //  HedgewarsMobile

     4 //

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

     6 //  Copyright 2010 __MyCompanyName__. All rights reserved.

     7 //

     8 

     9 #import "UIImageExtra.h"

    10 

    11 

    12 @implementation UIImage (extra)

    13  

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

    15   // Create a bitmap graphics context

    16   // This will also set it as the current context

    17   UIGraphicsBeginImageContext(size);

    18  

    19   // Draw the scaled image in the current context

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

    21  

    22   // Create a new image from current context

    23   UIImage* scaledImage = UIGraphicsGetImageFromCurrentImageContext();

    24  

    25   // Pop the current context from the stack

    26   UIGraphicsEndImageContext();

    27  

    28   // Return our new scaled image (autoreleased)

    29   return scaledImage;

    30 }

    31 

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

    33     // create a contex of size of the background image

    34     UIGraphicsBeginImageContext(self.size);

    35     

    36     // drav the background image

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

    38     

    39     // draw the image on top of the first image

    40     [secondImage drawAtPoint:secondImagePoint];

    41     

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

    43     UIImage *resultImage = UIGraphicsGetImageFromCurrentImageContext();

    44     

    45     // free drawing contex

    46     UIGraphicsEndImageContext();

    47     

    48     // return the resulting autoreleased image

    49     return resultImage;

    50 }

    51 

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

    53     // load image from path

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

    55     

    56     if (nil != image) {

    57         // get its CGImage representation with a give size

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

    59     

    60         // clean memory

    61         [image release];

    62     

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

    64         UIImage *sprite = [self initWithCGImage:cgImgage];

    65     

    66         // clean memory

    67         CGImageRelease(cgImgage);

    68 

    69         // return resulting image

    70         return sprite;

    71     } else {

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

    73         return nil;

    74     }

    75 }

    76  

    77 @end