Question

我使用vImageBoxConvolve_ARGB8888函数来模糊UIImage。代码如下所示：

 class MyLayer: CALayer, CAAnimationDelegate{

func updateBounds(_ bounds: CGRect){
    nextBounds = bounds
    self.bounds = bounds
}
private var nextBounds : CGRect!

func animationDidStop(_ anim: CAAnimation, finished flag: Bool) {
    if let keyPath = (anim as! CABasicAnimation).keyPath  , let displayLink = animationLoops[keyPath]{
        displayLink?.invalidate()
      animationLoops.removeValue(forKey: keyPath)    }
}

@objc func updateDrawing(displayLink: CADisplayLink){
   bounds = presentation()!.bounds
   setNeedsDisplay()
}

 var animationLoops: [String : CADisplayLink?] = [:]

  override func action(forKey event: String) -> CAAction? {
    let result = super.action(forKey: event)
    if(event == "bounds"){
       guard let result = result  as? CABasicAnimation,
        animationLoops[event] == nil
        else{return nil}
       let anim = CABasicAnimation.init(keyPath: result.keyPath)
          anim.fromValue = result.fromValue
          anim.toValue = nextBounds
         let caDisplayLink = CADisplayLink.init(target: self, selector: #selector(updateDrawing))
        caDisplayLink.add(to: .main,   forMode: RunLoop.Mode.default)
        anim.delegate = self
        animationLoops[event] = caDisplayLink
        return anim
    }
  return result
}

vImageBoxConvolve_ARGB8888函数接受背景颜色参数（第8个参数），该参数的类型为UnsafePointer。这里的参数为nil，但我想将其设置为红色。我不知道该怎么做。如果有人可以提供任何提示，我将不胜感激。预先感谢。

Answer 1

您可以这样做：

let redPointer = UnsafePointer<UInt8>([0xFF, 0x00, 0x00])

var error = vImageBoxConvolve_ARGB8888(&inBuffer,
                                       &outBuffer,
                                       nil,
                                       0,
                                       0,
                                       UInt32(boxSize),
                                       UInt32(boxSize),
                                       redPointer,
                                       vImage_Flags(kvImageBackgroundColorFill))

请记住，标记kvImageBackgroundColorFill和kvImageEdgeExtend是mutually exclusive，因此您不能在flags参数中传递kvImageBackgroundColorFill + kvImageEdgeExtend。

vImageBoxConvolve_ARGB8888 backgroundColor参数

1 个答案: