├── CoreImageReactionDiffusion.xcodeproj
    ├── project.pbxproj
    ├── project.xcworkspace
    │   └── contents.xcworkspacedata
    └── xcuserdata
    │   └── simongladman.xcuserdatad
    │       └── xcschemes
    │           ├── CoreImageReactionDiffusion.xcscheme
    │           └── xcschememanagement.plist
├── CoreImageReactionDiffusion
    ├── AppDelegate.swift
    ├── Assets.xcassets
    │   └── AppIcon.appiconset
    │   │   └── Contents.json
    ├── Base.lproj
    │   ├── LaunchScreen.storyboard
    │   └── Main.storyboard
    ├── Info.plist
    ├── ViewController.swift
    └── screenshot.jpg
└── README.md


/CoreImageReactionDiffusion.xcodeproj/project.pbxproj:
--------------------------------------------------------------------------------
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/CoreImageReactionDiffusion/AppDelegate.swift:
--------------------------------------------------------------------------------
 1 | //
 2 | //  AppDelegate.swift
 3 | //  CoreImageReactionDiffusion
 4 | //
 5 | //  Created by Simon Gladman on 04/01/2016.
 6 | //  Copyright © 2016 Simon Gladman. All rights reserved.
 7 | //
 8 | 
 9 | import UIKit
10 | 
11 | @UIApplicationMain
12 | class AppDelegate: UIResponder, UIApplicationDelegate {
13 | 
14 |     var window: UIWindow?
15 | 
16 | 
17 |     func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
18 |         // Override point for customization after application launch.
19 |         return true
20 |     }
21 | 
22 |     func applicationWillResignActive(application: UIApplication) {
23 |         // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
24 |         // Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.
25 |     }
26 | 
27 |     func applicationDidEnterBackground(application: UIApplication) {
28 |         // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
29 |         // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
30 |     }
31 | 
32 |     func applicationWillEnterForeground(application: UIApplication) {
33 |         // Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background.
34 |     }
35 | 
36 |     func applicationDidBecomeActive(application: UIApplication) {
37 |         // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
38 |     }
39 | 
40 |     func applicationWillTerminate(application: UIApplication) {
41 |         // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
42 |     }
43 | 
44 | 
45 | }
46 | 
47 | 


--------------------------------------------------------------------------------
/CoreImageReactionDiffusion/Assets.xcassets/AppIcon.appiconset/Contents.json:
--------------------------------------------------------------------------------
 1 | {
 2 |   "images" : [
 3 |     {
 4 |       "idiom" : "ipad",
 5 |       "size" : "29x29",
 6 |       "scale" : "1x"
 7 |     },
 8 |     {
 9 |       "idiom" : "ipad",
10 |       "size" : "29x29",
11 |       "scale" : "2x"
12 |     },
13 |     {
14 |       "idiom" : "ipad",
15 |       "size" : "40x40",
16 |       "scale" : "1x"
17 |     },
18 |     {
19 |       "idiom" : "ipad",
20 |       "size" : "40x40",
21 |       "scale" : "2x"
22 |     },
23 |     {
24 |       "idiom" : "ipad",
25 |       "size" : "76x76",
26 |       "scale" : "1x"
27 |     },
28 |     {
29 |       "idiom" : "ipad",
30 |       "size" : "76x76",
31 |       "scale" : "2x"
32 |     }
33 |   ],
34 |   "info" : {
35 |     "version" : 1,
36 |     "author" : "xcode"
37 |   }
38 | }


--------------------------------------------------------------------------------
/CoreImageReactionDiffusion/Base.lproj/LaunchScreen.storyboard:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="UTF-8" standalone="no"?>
 2 | <document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="8150" systemVersion="15A204g" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES" initialViewController="01J-lp-oVM">
 3 |     <dependencies>
 4 |         <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="8122"/>
 5 |     </dependencies>
 6 |     <scenes>
 7 |         <!--View Controller-->
 8 |         <scene sceneID="EHf-IW-A2E">
 9 |             <objects>
10 |                 <viewController id="01J-lp-oVM" sceneMemberID="viewController">
11 |                     <layoutGuides>
12 |                         <viewControllerLayoutGuide type="top" id="Llm-lL-Icb"/>
13 |                         <viewControllerLayoutGuide type="bottom" id="xb3-aO-Qok"/>
14 |                     </layoutGuides>
15 |                     <view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
16 |                         <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
17 |                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
18 |                         <animations/>
19 |                         <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
20 |                     </view>
21 |                 </viewController>
22 |                 <placeholder placeholderIdentifier="IBFirstResponder" id="iYj-Kq-Ea1" userLabel="First Responder" sceneMemberID="firstResponder"/>
23 |             </objects>
24 |             <point key="canvasLocation" x="53" y="375"/>
25 |         </scene>
26 |     </scenes>
27 | </document>
28 | 


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/CoreImageReactionDiffusion/Base.lproj/Main.storyboard:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="UTF-8" standalone="no"?>
 2 | <document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="6211" systemVersion="14A298i" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" initialViewController="BYZ-38-t0r">
 3 |     <dependencies>
 4 |         <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="6204"/>
 5 |     </dependencies>
 6 |     <scenes>
 7 |         <!--View Controller-->
 8 |         <scene sceneID="tne-QT-ifu">
 9 |             <objects>
10 |                 <viewController id="BYZ-38-t0r" customClass="ViewController" customModuleProvider="target" sceneMemberID="viewController">
11 |                     <layoutGuides>
12 |                         <viewControllerLayoutGuide type="top" id="y3c-jy-aDJ"/>
13 |                         <viewControllerLayoutGuide type="bottom" id="wfy-db-euE"/>
14 |                     </layoutGuides>
15 |                     <view key="view" contentMode="scaleToFill" id="8bC-Xf-vdC">
16 |                         <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
17 |                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
18 |                         <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
19 |                     </view>
20 |                 </viewController>
21 |                 <placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
22 |             </objects>
23 |         </scene>
24 |     </scenes>
25 | </document>
26 | 


--------------------------------------------------------------------------------
/CoreImageReactionDiffusion/Info.plist:
--------------------------------------------------------------------------------
 1 | <?xml version="1.0" encoding="UTF-8"?>
 2 | <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 3 | <plist version="1.0">
 4 | <dict>
 5 | 	<key>CFBundleDevelopmentRegion</key>
 6 | 	<string>en</string>
 7 | 	<key>CFBundleExecutable</key>
 8 | 	<string>$(EXECUTABLE_NAME)</string>
 9 | 	<key>CFBundleIdentifier</key>
10 | 	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
11 | 	<key>CFBundleInfoDictionaryVersion</key>
12 | 	<string>6.0</string>
13 | 	<key>CFBundleName</key>
14 | 	<string>$(PRODUCT_NAME)</string>
15 | 	<key>CFBundlePackageType</key>
16 | 	<string>APPL</string>
17 | 	<key>CFBundleShortVersionString</key>
18 | 	<string>1.0</string>
19 | 	<key>CFBundleSignature</key>
20 | 	<string>????</string>
21 | 	<key>CFBundleVersion</key>
22 | 	<string>1</string>
23 | 	<key>LSRequiresIPhoneOS</key>
24 | 	<true/>
25 | 	<key>UILaunchStoryboardName</key>
26 | 	<string>LaunchScreen</string>
27 | 	<key>UIMainStoryboardFile</key>
28 | 	<string>Main</string>
29 | 	<key>UIRequiredDeviceCapabilities</key>
30 | 	<array>
31 | 		<string>armv7</string>
32 | 	</array>
33 | 	<key>UISupportedInterfaceOrientations~ipad</key>
34 | 	<array>
35 | 		<string>UIInterfaceOrientationPortrait</string>
36 | 		<string>UIInterfaceOrientationPortraitUpsideDown</string>
37 | 		<string>UIInterfaceOrientationLandscapeLeft</string>
38 | 		<string>UIInterfaceOrientationLandscapeRight</string>
39 | 	</array>
40 | </dict>
41 | </plist>
42 | 


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/CoreImageReactionDiffusion/ViewController.swift:
--------------------------------------------------------------------------------
  1 | //
  2 | //  ViewController.swift
  3 | //  CoreImageReactionDiffusion
  4 | //
  5 | //  Created by Simon Gladman on 04/01/2016.
  6 | //  Copyright © 2016 Simon Gladman. All rights reserved.
  7 | //
  8 | 
  9 | import UIKit
 10 | import GLKit
 11 | 
 12 | class ViewController: UIViewController {
 13 | 
 14 |     let grayScottFilter = GrayScottFilter()
 15 |     
 16 |     let rect640x640 = CGRect(x: 0, y: 0, width: 640, height: 640)
 17 |     
 18 |     let accumulator = CIImageAccumulator(extent: CGRect(x: 0, y: 0, width: 640, height: 640), format: kCIFormatARGB8)
 19 |     
 20 |     let edgesFilter = CIFilter(name: "CIEdges",
 21 |         withInputParameters: [kCIInputIntensityKey: 50])!
 22 |     
 23 |     let imageView = MetalImageView()
 24 | 
 25 |     override func viewDidLoad()
 26 |     {
 27 |         super.viewDidLoad()
 28 |         
 29 |         view.addSubview(imageView)
 30 |         
 31 |         setInitialImage()
 32 |         
 33 |         let displayLink = CADisplayLink(target: self, selector: #selector(ViewController.step))
 34 |         displayLink.addToRunLoop(NSRunLoop.mainRunLoop(), forMode: NSDefaultRunLoopMode)
 35 |     }
 36 | 
 37 |     func setInitialImage()
 38 |     {
 39 |         let yellow = CIImage(color: CIColor(color: UIColor.yellowColor()))
 40 |         let noise = CIFilter(name: "CIRandomGenerator")!
 41 | 
 42 |         let crop = CIFilter(name: "CICrop",
 43 |             withInputParameters: [kCIInputImageKey: noise.outputImage!,
 44 |                 "inputRectangle": CIVector(CGRect: rect640x640.insetBy(dx: 250, dy: 250))])!
 45 | 
 46 |         let composite = CIFilter(name: "CISourceAtopCompositing",
 47 |             withInputParameters: [kCIInputBackgroundImageKey: yellow,
 48 |                 kCIInputImageKey:crop.outputImage!])!
 49 |         
 50 |         accumulator.setImage(composite.outputImage!)
 51 |     }
 52 |     
 53 |     func step()
 54 |     {
 55 |         for _ in 0 ..< 5
 56 |         {
 57 |             grayScottFilter.setValue(accumulator.image(),
 58 |                 forKey: kCIInputImageKey)
 59 |             accumulator.setImage(grayScottFilter.outputImage)
 60 |         }
 61 |         
 62 |         edgesFilter.setValue(accumulator.image(),
 63 |                              forKey: kCIInputImageKey)
 64 |         
 65 |         imageView.image = edgesFilter.outputImage!
 66 |     }
 67 |     
 68 |     override func viewDidLayoutSubviews()
 69 |     {
 70 |         imageView.frame = CGRect(
 71 |             origin: CGPoint(
 72 |                 x: view.frame.width / 2 - rect640x640.width / 2,
 73 |                 y: view.frame.height / 2 - rect640x640.height / 2),
 74 |             size: CGSize(
 75 |                 width: rect640x640.width,
 76 |                 height: rect640x640.height))
 77 |     }
 78 | 
 79 | }
 80 | 
 81 | 
 82 | // MARK: GrayScottFilter_v2 - Uses Core Image convolution filter with Laplacian kernel
 83 | class GrayScottFilter_v2: CIFilter
 84 | {
 85 |     var inputImage : CIImage?
 86 |  
 87 |     var D_a: CGFloat = 0.189
 88 |     var D_b: CGFloat = 0.080
 89 |     var k: CGFloat = 0.062
 90 |     var f: CGFloat = 0.0425
 91 |     
 92 |     let grayScottKernel = CIColorKernel(string:
 93 |         "kernel vec4 coreImageKernel(__sample pixel, __sample laplacian, float D_a, float D_b, float k, float f) " +
 94 |         "{" +
 95 |         "float reactionRate = pixel.x * pixel.z * pixel.z;" +
 96 |   
 97 |         "float u = pixel.x + (D_a * laplacian.x) - reactionRate + f * (1.0 - pixel.x);" +
 98 |         "float v = pixel.z + (D_b * laplacian.z) + reactionRate - (f + k) * pixel.z;" +
 99 |         
100 |         "return vec4(u, u, v, 1.0);" +
101 |         "}"
102 |     )
103 | 
104 |     let laplacianFilter: CIFilter =
105 |     {
106 |         let laplacianWeights = CIVector(values: [
107 |             CGFloat(0.0), CGFloat(1.0), CGFloat(0.0),
108 |             CGFloat(1.0), CGFloat(-4.0), CGFloat(1.0),
109 |             CGFloat(0.0), CGFloat(1.0), CGFloat(0.0) ], count: 9)
110 |         
111 |         return CIFilter(name: "CIConvolution3X3",
112 |             withInputParameters: [
113 |                 kCIInputWeightsKey: laplacianWeights])!
114 |     }()
115 |     
116 |     override var outputImage : CIImage!
117 |     {
118 |         if let inputImage = inputImage,
119 |             grayScottKernel = grayScottKernel
120 |         {
121 |             laplacianFilter.setValue(inputImage,
122 |                 forKey: kCIInputImageKey)
123 |   
124 |             let arguments = [inputImage,
125 |                 laplacianFilter.outputImage!,
126 |                 D_a, D_b, k, f]
127 |             let extent = inputImage.extent
128 |         
129 |             return grayScottKernel.applyWithExtent(extent,
130 |                 arguments: arguments)
131 |         }
132 |         return nil
133 |     }
134 | }
135 | 
136 | // MARK: GrayScottFilter_v3 - Hand coded convolution filter
137 | class GrayScottFilter_v3: CIFilter
138 | {
139 |     var inputImage : CIImage?
140 |     
141 |     var D_a: CGFloat = 0.189
142 |     var D_b: CGFloat = 0.080
143 |     var k: CGFloat = 0.062
144 |     var f: CGFloat = 0.0425
145 |     
146 |     let grayScottKernel = CIColorKernel(string:
147 |         "kernel vec4 coreImageKernel(__sample pixel, __sample laplacian, float D_a, float D_b, float k, float f) " +
148 |         "{" +
149 |         "float reactionRate = pixel.x * pixel.z * pixel.z;" +
150 |         
151 |         "float u = pixel.x + (D_a * laplacian.x) - reactionRate + f * (1.0 - pixel.x);" +
152 |         "float v = pixel.z + (D_b * laplacian.z) + reactionRate - (f + k) * pixel.z;" +
153 |         
154 |         "return vec4(u, u, v, 1.0);" +
155 |         "}"
156 |     )
157 |     
158 |     let laplacianKernel = CIKernel(string:
159 |         "kernel vec4 laplacianConvolution(sampler image) " +
160 |         "{" +
161 |         "vec2 d = destCoord();" +
162 |         
163 |         "vec2 northSample = sample(image, samplerTransform(image, d + vec2(0.0,-1.0))).rb;" +
164 |         "vec2 southSample = sample(image, samplerTransform(image, d + vec2(0.0,1.0))).rb;" +
165 |         "vec2 eastSample = sample(image, samplerTransform(image, d + vec2(1.0,0.0))).rb;" +
166 |         "vec2 westSample = sample(image, samplerTransform(image, d + vec2(-1.0,0.0))).rb;" +
167 |         
168 |         "vec2 thisSample = sample(image, samplerCoord(image)).xz;" +
169 |         
170 |         "vec2 laplacian = (northSample + southSample + eastSample + westSample) - (4.0 * thisSample);" +
171 |             
172 |         "return vec4(laplacian.x, laplacian.x, laplacian.y, 1.0);" +
173 |         "}"
174 |     )
175 | 
176 |     override var outputImage : CIImage!
177 |     {
178 |         if let inputImage = inputImage,
179 |             laplacianKernel = laplacianKernel,
180 |             grayScottKernel = grayScottKernel
181 |         {
182 |             let laplacian = laplacianKernel.applyWithExtent(inputImage.extent,
183 |                 roiCallback:
184 |                 {
185 |                     (index, rect) in
186 |                     return rect
187 |                 },
188 |                 arguments: [inputImage])
189 |             
190 |             let arguments = [inputImage,
191 |                 laplacian!,
192 |                 D_a, D_b, k, f]
193 |             let extent = inputImage.extent
194 |         
195 |             return grayScottKernel.applyWithExtent(extent,
196 |                 arguments: arguments)
197 |         }
198 |         return nil
199 |     }
200 | }
201 | 
202 | // MARK: GrayScottFilter
203 | 
204 | class GrayScottFilter: CIFilter
205 | {
206 |     var inputImage : CIImage?
207 |     
208 |     
209 |     var D_a: CGFloat = 0.189
210 |     var D_b: CGFloat = 0.080
211 |     var k: CGFloat = 0.062
212 |     var f: CGFloat = 0.0425
213 |     
214 |     let grayScottKernel = CIKernel(string:
215 |         "kernel vec4 coreImageKernel(sampler image, float D_a, float D_b, float k, float f) " +
216 |         "{" +
217 |         
218 |         "vec2 d = destCoord();" +
219 |         
220 |         "vec2 northSample = sample(image, samplerTransform(image, d + vec2(0.0,-1.0))).rb;" +
221 |         "vec2 southSample = sample(image, samplerTransform(image, d + vec2(0.0,1.0))).rb;" +
222 |         "vec2 eastSample = sample(image, samplerTransform(image, d + vec2(1.0,0.0))).rb;" +
223 |         "vec2 westSample = sample(image, samplerTransform(image, d + vec2(-1.0,0.0))).rb;" +
224 |         
225 |         "vec2 thisSample = sample(image, samplerCoord(image)).xz;" +
226 |         
227 |         "vec2 laplacian = (northSample + southSample + eastSample + westSample) - (4.0 * thisSample);" +
228 |         
229 |         "float reactionRate = thisSample.x * thisSample.y * thisSample.y;" +
230 |   
231 |         "float u = thisSample.x + (D_a * laplacian.x) - reactionRate + f * (1.0 - thisSample.x);" +
232 |         "float v = thisSample.y + (D_b * laplacian.y) + reactionRate - (f + k) * thisSample.y;" +
233 |         
234 |         "return vec4(u, u, v, 1.0);" +
235 |         "}"
236 |     )
237 |     
238 |     override var outputImage : CIImage!
239 |     {
240 |         if let inputImage = inputImage,
241 |             grayScottKernel = grayScottKernel
242 |         {
243 |             let arguments = [inputImage, D_a, D_b, k, f]
244 |             let extent = inputImage.extent
245 |         
246 |             return grayScottKernel.applyWithExtent(extent,
247 |                 roiCallback:
248 |                 {
249 |                     (index, rect) in
250 |                     return rect
251 |                 },
252 |                 arguments: arguments)
253 |         }
254 |         return nil
255 |     }
256 | }
257 | 
258 | // MARK Metal Image View
259 | 
260 | import MetalKit
261 | 
262 | /// `MetalImageView` extends an `MTKView` and exposes an `image` property of type `CIImage` to
263 | /// simplify Metal based rendering of Core Image filters.
264 | 
265 | class MetalImageView: MTKView
266 | {
267 |     let colorSpace = CGColorSpaceCreateDeviceRGB()!
268 |     
269 |     lazy var commandQueue: MTLCommandQueue =
270 |     {
271 |         [unowned self] in
272 |         
273 |         return self.device!.newCommandQueue()
274 |     }()
275 |     
276 |     lazy var ciContext: CIContext =
277 |     {
278 |         [unowned self] in
279 |         
280 |         return CIContext(MTLDevice: self.device!)
281 |     }()
282 | 
283 |     override init(frame frameRect: CGRect, device: MTLDevice?)
284 |     {
285 |         super.init(frame: frameRect,
286 |                    device: device ?? MTLCreateSystemDefaultDevice())
287 |         
288 |         if super.device == nil
289 |         {
290 |             fatalError("Device doesn't support Metal")
291 |         }
292 |         
293 |         framebufferOnly = false
294 |     }
295 |     
296 |     required init(coder: NSCoder)
297 |     {
298 |         fatalError("init(coder:) has not been implemented")
299 |     }
300 |     
301 |     /// The image to display
302 |     var image: CIImage?
303 |         {
304 |         didSet
305 |         {
306 |             renderImage()
307 |         }
308 |     }
309 |     
310 |     func renderImage()
311 |     {
312 |         guard let
313 |             image = image,
314 |             targetTexture = currentDrawable?.texture else
315 |         {
316 |             return
317 |         }
318 |         
319 |         let commandBuffer = commandQueue.commandBuffer()
320 |         
321 |         let bounds = CGRect(origin: CGPointZero, size: drawableSize)
322 |         
323 |         let originX = image.extent.origin.x
324 |         let originY = image.extent.origin.y
325 |         
326 |         let scaleX = drawableSize.width / image.extent.width
327 |         let scaleY = drawableSize.height / image.extent.height
328 |         let scale = min(scaleX, scaleY)
329 |         
330 |         let scaledImage = image
331 |             .imageByApplyingTransform(CGAffineTransformMakeTranslation(-originX, -originY))
332 |             .imageByApplyingTransform(CGAffineTransformMakeScale(scale, scale))
333 |         
334 |         ciContext.render(scaledImage,
335 |                          toMTLTexture: targetTexture,
336 |                          commandBuffer: commandBuffer,
337 |                          bounds: bounds,
338 |                          colorSpace: colorSpace)
339 |         
340 |         commandBuffer.presentDrawable(currentDrawable!)
341 |         
342 |         commandBuffer.commit()
343 |     }
344 | }


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/CoreImageReactionDiffusion/screenshot.jpg:
--------------------------------------------------------------------------------
https://raw.githubusercontent.com/FlexMonkey/CoreImageReactionDiffusion/907d90c6d8ef619232f4b153e3450b7c0defa5dd/CoreImageReactionDiffusion/screenshot.jpg


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/README.md:
--------------------------------------------------------------------------------
1 | # CoreImageReactionDiffusion
2 | Gary-Scott reaction Diffusion Implemented as a CIKernel
3 | 
4 | ![screenshot](CoreImageReactionDiffusion/screenshot.jpg)
5 | 
6 | Another project for my upcoming book, _Core Image for Swift_ - an implementation of the Gray-Scott reaction diffusion model as a custom Core Image kernel.
7 | 
8 | 


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