gistfile1.txt

+ (UIImage*)thumbnailOfImage:(UIImage*)image withSize:(CGSize)aSize
{
         //NSLog(@"create thumbnail image");
        
         if (!image)
              return nil;
        
         CGImageRef imageRef = [image CGImage];
         UIImage *thumb = nil;
        
         //   struct CGSize imgSize = [imageRef size];
         float _width = CGImageGetWidth(imageRef);
         float _height = CGImageGetHeight(imageRef);
        
         // hardcode width and height for now, shouldn't stay like that
         float _resizeToWidth;
         float _resizeToHeight;
        
         _resizeToWidth = aSize.width;
         _resizeToHeight = aSize.height;
        
         float _moveX = 0.0f;
         float _moveY = 0.0f;
        
         // determine the start position in the window if it doesn't fit the sizes 100%
         //NSLog(@" width: %f  to: %f", _width, _resizeToWidth);
         //NSLog(@" height: %f  to: %f", _height, _resizeToHeight);
        
         // resize the image if it is bigger than the screen only
         if ( (_width > _resizeToWidth) || (_height > _resizeToHeight) )
         {
              float _amount = 0.0f;
             
              if (_width > _resizeToWidth)
              {
                     _amount = _resizeToWidth / _width;
                     _width *= _amount;
                     _height *= _amount;
                     //NSLog(@"1 width: %f height: %f", _width, _height);
              }
              if (_height > _resizeToHeight)
              {
                     _amount = _resizeToHeight / _height;
                     _width *= _amount;
                     _height *= _amount;
                     //NSLog(@"2 width: %f height: %f", _width, _height);
              }    
         }
        
         _width = (NSInteger)_width;
         _height = (NSInteger)_height;
        
         _resizeToWidth = _width;
         _resizeToHeight = _height;
        
         CGContextRef bitmap = CGBitmapContextCreate(NULL,
_resizeToWidth,
_resizeToHeight,                                                                     CGImageGetBitsPerComponent(imageRef),                                                                                        CGImageGetBitsPerPixel(imageRef)*_resizeToWidth,                                                                                      CGImageGetColorSpace(imageRef),                                                                                    CGImageGetBitmapInfo(imageRef));
        
         // now center the image
         _moveX = (_resizeToWidth - _width) / 2;
         _moveY = (_resizeToHeight - _height) / 2;
        
         CGContextSetRGBFillColor(bitmap, 1.f, 1.f, 1.f, 1.0f);
         CGContextFillRect( bitmap, CGRectMake(0, 0, _resizeToWidth, _resizeToHeight));
         //   CGContextRotateCTM( bitmap, 180*(M_PI/180));
         CGContextDrawImage( bitmap, CGRectMake(_moveX, _moveY, _width, _height), imageRef );
        
         // create a templete imageref.
         CGImageRef ref = CGBitmapContextCreateImage( bitmap );
         thumb = [UIImage imageWithCGImage:ref];
        
         // release the templete imageref.
         CGContextRelease( bitmap );
         CGImageRelease( ref );
        
         return [[thumb retain] autorelease];
}