[英]How to optimize filter performance CIFilter
static func effectTransfer(image: UIImage) -> UIImage {
let coreImage = CIImage(image: image)
let filter = CIFilter(name: "CIPhotoEffectTransfer" )
filter!.setDefaults()
filter!.setValue(coreImage, forKey: kCIInputImageKey)
let filteredImageData = filter!.value(forKey: kCIOutputImageKey) as! CIImage
let filteredImageRef = ciContext.createCGImage(filteredImageData, from: filteredImageData.extent)
return UIImage(cgImage: filteredImageRef!)
}
When you click on a filter, the filter is applied extremely slowly, and the processor grows for a second or two to 60%, how can I optimize it? 当您单击一个过滤器时,该过滤器的应用速度非常慢,并且处理器增长了1到2到60%,我如何对其进行优化? Am I doing it right? 我做对了吗?
The slowest part is converting to CGImage. 最慢的部分是转换为CGImage。 You can create UIImage directly from CIImage: 您可以直接从CIImage创建UIImage:
UIImage(ciImage: outputCI, scale: input.scale, orientation: input.imageOrientation)
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