WWDC 2015

Whats new in Core Image

Introduction to Core Image

CIKernel - * Represents a program written in Core Image’s language

CIFilter Has mutable input parameters

CIFilter Uses one or more CIKernels to create a new image based on inputs

CIImage - * An immutable object that represents the recipe for an image

CIContext - An object through which Core Image draws results

What's new

Metal
- As input and output of CIImage
- Core Image use Metal to render filters
- Some ClFiler use Metal for performance
Filter
- 40 new filers for iOS Core Image
- PDF417 and Code128 generators
Detectors
- CIFaceDetector
- CIBarcodeDetector
- CIRectangleDetector
- CITextDetector
Color Management
- Supports ICC-based CGColorSpaceRef for input or output
- Correct Rendering of TIFFs and JPGs tagged with colorspace
Improved CIKernel
- New CIKernel Classes
- Improved CIKernel Language
Unified implementation

Bridging Core Image with other framework

Using Metal with Core Image
- New render API with commandBuffer

Bridging Core Image and AV Foundation

Core Image integrated with AVVideoComposition
Automatic color management which can be disabled
Examples:
- Exporting an AVAsset applying CIFilters
- Playback an AVAseet applying CIFilters

Core Image Provider

UIImageView is not suggested for performance-needed applications as it renders twice in system one for CPU ad one for GPU.

//in iOS, expose the CALayer and apply CIFiler for best performance
class MyGLKView : GLKView {
}
class MyGLView : UIView {
    override class func layerClass() -> AnyClass { return CAEAGLLayer.self }
}

CLContext should create once.