Detailed description of Mask usage in iPhone development applications

IPhone DevelopmentApplication in progressMaskUsage is the content to be introduced in this article, mainly to introduceMask. There is not much content. This article is mainly implemented by code. Let's take a look at the details.

Mask Method

 
 

  
  
+ (UIImage*) maskImage:(UIImage*)image withMask:(UIImage*)mask {  
  
  
 
  
  
 CGImageRef imgRef = [image CGImage];CGImageRef maskRef = [mask CGImage];
  
  
CGImageRef actualMask = CGImageMaskCreate(CGImageGetWidth(maskRef),CGImageGetHeight(maskRef),
  
  
CGImageGetBitsPerComponent(maskRef),CGImageGetBitsPerPixel(maskRef),
  
  
CGImageGetBytesPerRow(maskRef),CGImageGetDataProvider(maskRef), 
  
  
NULL, false);CGImageRef masked = CGImageCreateWithMask(imgRef, 
  
  
actualMask);return [UIImage imageWithCGImage:masked];   
  
  
} 
 
 

Resize Images

 
 

  
  
+ (UIImage *) resizeImage:(UIImage *)image size:(CGSize)newSize {UIGraphicsBeginImageContext(newSize);  
  
  
[image drawInRect:CGRectMake(0, 0, newSize.width, newSize.height)];  
  
  
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();UIGraphicsEndImageContext();  
  
  
return newImage;   
  
  
} 
 
 

Method call/: Convert the original image to 120x120. In this step, the size of the original image is determined.

 
 

  
  
UIImage * newImg = [Utils resizeImage: orgImg size: CGSizeMake (120,120)];
  
  
UIImage * maskImg = [UIImage imageNamed: @ "mask.png"];
  
  
// Obtain the parts of the mask.
  
  
NewImg = [ImageUtils maskImage: newImg withMask: maskImg];
  
  
// Start cropping (Clip) Slices
 
 

Summary: DetailsIPhone DevelopmentApplication in progressMaskI hope this article will help you with your usage!