From 9a68d5978180d5973106e41306ea72296a283c1f Mon Sep 17 00:00:00 2001
From: Jackson Isaac <jacksonisaac2008@gmail.com>
Date: Sat, 5 Nov 2016 20:23:21 +0530
Subject: [PATCH 01/18] Add Image Processor Code.

---
 ImageFilter.xcodeproj/project.pbxproj         |  17 +++
 .../AppIcon.appiconset/Contents.json          |   5 +
 ImageFilter/Assets.xcassets/Contents.json     |   6 +
 .../sample.imageset/Contents.json             |  21 +++
 .../sample.imageset/sample.png                | Bin 0 -> 14076 bytes
 ImageFilter/Base.lproj/Main.storyboard        |  21 ++-
 ImageFilter/ImageProcessor.swift              | 125 ++++++++++++++++++
 ImageFilter/RGBAImage.swift                   |  92 +++++++++++++
 ImageFilter/ViewController.swift              |  12 ++
 9 files changed, 295 insertions(+), 4 deletions(-)
 create mode 100644 ImageFilter/Assets.xcassets/Contents.json
 create mode 100644 ImageFilter/Assets.xcassets/sample.imageset/Contents.json
 create mode 100644 ImageFilter/Assets.xcassets/sample.imageset/sample.png
 create mode 100644 ImageFilter/ImageProcessor.swift
 create mode 100644 ImageFilter/RGBAImage.swift

diff --git a/ImageFilter.xcodeproj/project.pbxproj b/ImageFilter.xcodeproj/project.pbxproj
index 821b415..aa8b6ca 100644
--- a/ImageFilter.xcodeproj/project.pbxproj
+++ b/ImageFilter.xcodeproj/project.pbxproj
@@ -12,6 +12,8 @@
 		2987A5541DCD1BAE001FDF06 /* Main.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 2987A5521DCD1BAE001FDF06 /* Main.storyboard */; };
 		2987A5561DCD1BAE001FDF06 /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = 2987A5551DCD1BAE001FDF06 /* Assets.xcassets */; };
 		2987A5591DCD1BAE001FDF06 /* LaunchScreen.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 2987A5571DCD1BAE001FDF06 /* LaunchScreen.storyboard */; };
+		2987A5611DCDAF85001FDF06 /* RGBAImage.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2987A5601DCDAF85001FDF06 /* RGBAImage.swift */; };
+		2987A5631DCDE4C8001FDF06 /* ImageProcessor.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2987A5621DCDE4C8001FDF06 /* ImageProcessor.swift */; };
 /* End PBXBuildFile section */
 
 /* Begin PBXFileReference section */
@@ -22,6 +24,8 @@
 		2987A5551DCD1BAE001FDF06 /* Assets.xcassets */ = {isa = PBXFileReference; lastKnownFileType = folder.assetcatalog; path = Assets.xcassets; sourceTree = "<group>"; };
 		2987A5581DCD1BAE001FDF06 /* Base */ = {isa = PBXFileReference; lastKnownFileType = file.storyboard; name = Base; path = Base.lproj/LaunchScreen.storyboard; sourceTree = "<group>"; };
 		2987A55A1DCD1BAE001FDF06 /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = Info.plist; sourceTree = "<group>"; };
+		2987A5601DCDAF85001FDF06 /* RGBAImage.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = RGBAImage.swift; sourceTree = "<group>"; };
+		2987A5621DCDE4C8001FDF06 /* ImageProcessor.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = ImageProcessor.swift; sourceTree = "<group>"; };
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
@@ -56,10 +60,12 @@
 			children = (
 				2987A54E1DCD1BAE001FDF06 /* AppDelegate.swift */,
 				2987A5501DCD1BAE001FDF06 /* ViewController.swift */,
+				2987A5601DCDAF85001FDF06 /* RGBAImage.swift */,
 				2987A5521DCD1BAE001FDF06 /* Main.storyboard */,
 				2987A5551DCD1BAE001FDF06 /* Assets.xcassets */,
 				2987A5571DCD1BAE001FDF06 /* LaunchScreen.storyboard */,
 				2987A55A1DCD1BAE001FDF06 /* Info.plist */,
+				2987A5621DCDE4C8001FDF06 /* ImageProcessor.swift */,
 			);
 			path = ImageFilter;
 			sourceTree = "<group>";
@@ -96,6 +102,7 @@
 				TargetAttributes = {
 					2987A54A1DCD1BAE001FDF06 = {
 						CreatedOnToolsVersion = 7.3.1;
+						DevelopmentTeam = M89DBD7R74;
 					};
 				};
 			};
@@ -136,6 +143,8 @@
 			buildActionMask = 2147483647;
 			files = (
 				2987A5511DCD1BAE001FDF06 /* ViewController.swift in Sources */,
+				2987A5611DCDAF85001FDF06 /* RGBAImage.swift in Sources */,
+				2987A5631DCDE4C8001FDF06 /* ImageProcessor.swift in Sources */,
 				2987A54F1DCD1BAE001FDF06 /* AppDelegate.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
@@ -251,10 +260,14 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				CODE_SIGN_IDENTITY = "iPhone Developer";
+				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
 				INFOPLIST_FILE = ImageFilter/Info.plist;
+				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = com.jacksonisaac.ImageFilter;
 				PRODUCT_NAME = "$(TARGET_NAME)";
+				PROVISIONING_PROFILE = "";
 			};
 			name = Debug;
 		};
@@ -262,10 +275,14 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				CODE_SIGN_IDENTITY = "iPhone Developer";
+				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
 				INFOPLIST_FILE = ImageFilter/Info.plist;
+				IPHONEOS_DEPLOYMENT_TARGET = 9.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
 				PRODUCT_BUNDLE_IDENTIFIER = com.jacksonisaac.ImageFilter;
 				PRODUCT_NAME = "$(TARGET_NAME)";
+				PROVISIONING_PROFILE = "";
 			};
 			name = Release;
 		};
diff --git a/ImageFilter/Assets.xcassets/AppIcon.appiconset/Contents.json b/ImageFilter/Assets.xcassets/AppIcon.appiconset/Contents.json
index 36d2c80..eeea76c 100644
--- a/ImageFilter/Assets.xcassets/AppIcon.appiconset/Contents.json
+++ b/ImageFilter/Assets.xcassets/AppIcon.appiconset/Contents.json
@@ -59,6 +59,11 @@
       "idiom" : "ipad",
       "size" : "76x76",
       "scale" : "2x"
+    },
+    {
+      "idiom" : "ipad",
+      "size" : "83.5x83.5",
+      "scale" : "2x"
     }
   ],
   "info" : {
diff --git a/ImageFilter/Assets.xcassets/Contents.json b/ImageFilter/Assets.xcassets/Contents.json
new file mode 100644
index 0000000..da4a164
--- /dev/null
+++ b/ImageFilter/Assets.xcassets/Contents.json
@@ -0,0 +1,6 @@
+{
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}
\ No newline at end of file
diff --git a/ImageFilter/Assets.xcassets/sample.imageset/Contents.json b/ImageFilter/Assets.xcassets/sample.imageset/Contents.json
new file mode 100644
index 0000000..f4d8b74
--- /dev/null
+++ b/ImageFilter/Assets.xcassets/sample.imageset/Contents.json
@@ -0,0 +1,21 @@
+{
+  "images" : [
+    {
+      "idiom" : "universal",
+      "filename" : "sample.png",
+      "scale" : "1x"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "2x"
+    },
+    {
+      "idiom" : "universal",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "version" : 1,
+    "author" : "xcode"
+  }
+}
\ No newline at end of file
diff --git a/ImageFilter/Assets.xcassets/sample.imageset/sample.png b/ImageFilter/Assets.xcassets/sample.imageset/sample.png
new file mode 100644
index 0000000000000000000000000000000000000000..67595e5ec0315f55b4d5d79fabc28aa478a4e02c
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HcmV?d00001

diff --git a/ImageFilter/Base.lproj/Main.storyboard b/ImageFilter/Base.lproj/Main.storyboard
index 3a2a49b..51b821d 100644
--- a/ImageFilter/Base.lproj/Main.storyboard
+++ b/ImageFilter/Base.lproj/Main.storyboard
@@ -1,13 +1,13 @@
-<?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<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">
+<?xml version="1.0" encoding="UTF-8"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="10117" systemVersion="16B2555" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" initialViewController="BYZ-38-t0r">
     <dependencies>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="6204"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="10085"/>
     </dependencies>
     <scenes>
         <!--View Controller-->
         <scene sceneID="tne-QT-ifu">
             <objects>
-                <viewController id="BYZ-38-t0r" customClass="ViewController" customModuleProvider="target" sceneMemberID="viewController">
+                <viewController id="BYZ-38-t0r" customClass="ViewController" customModule="ImageFilter" customModuleProvider="target" sceneMemberID="viewController">
                     <layoutGuides>
                         <viewControllerLayoutGuide type="top" id="y3c-jy-aDJ"/>
                         <viewControllerLayoutGuide type="bottom" id="wfy-db-euE"/>
@@ -15,11 +15,24 @@
                     <view key="view" contentMode="scaleToFill" id="8bC-Xf-vdC">
                         <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <subviews>
+                            <imageView userInteractionEnabled="NO" contentMode="scaleAspectFit" horizontalHuggingPriority="251" verticalHuggingPriority="251" fixedFrame="YES" image="sample" translatesAutoresizingMaskIntoConstraints="NO" id="jvM-47-h1h">
+                                <rect key="frame" x="0.0" y="0.0" width="284" height="302"/>
+                                <color key="backgroundColor" red="0.0" green="0.0" blue="0.0" alpha="1" colorSpace="calibratedRGB"/>
+                            </imageView>
+                        </subviews>
                         <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
                     </view>
+                    <connections>
+                        <outlet property="imageView" destination="jvM-47-h1h" id="kUf-7f-KsO"/>
+                    </connections>
                 </viewController>
                 <placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
             </objects>
+            <point key="canvasLocation" x="217" y="-4"/>
         </scene>
     </scenes>
+    <resources>
+        <image name="sample" width="75" height="75"/>
+    </resources>
 </document>
diff --git a/ImageFilter/ImageProcessor.swift b/ImageFilter/ImageProcessor.swift
new file mode 100644
index 0000000..9e12edd
--- /dev/null
+++ b/ImageFilter/ImageProcessor.swift
@@ -0,0 +1,125 @@
+//
+//  ImageProcessor.swift
+//  ImageFilter
+//
+//  Created by Jackson Isaac on 05/11/16.
+//  Copyright © 2016 Jackson Isaac. All rights reserved.
+//
+
+import Foundation
+
+class ImageProcessor {
+    var totalRed = 0
+    var totalBlue = 0
+    var totalGreen = 0
+    var pixelCount = 0
+    
+    var imageRGBA:RGBAImage?
+    
+    // Constructor
+    init?(imageRGBA: RGBAImage) {
+        self.imageRGBA = imageRGBA
+        pixelCount = imageRGBA.width * imageRGBA.height
+        countRGBVal()
+    }
+    
+    // Count and store RGB values of the image.
+    func countRGBVal(){
+        // 1a. Loop through each pixel of the image
+        for y in 0..<self.imageRGBA!.height{
+            for x in 0..<self.imageRGBA!.width {
+                let index = y*self.imageRGBA!.width + x
+                let pixel = self.imageRGBA!.pixels[index]
+                self.totalRed += Int(pixel.red)
+                self.totalGreen += Int(pixel.green)
+                self.totalBlue += Int(pixel.blue)
+            }
+        }
+    }
+    
+    // Apply default filter to the image and return the RGBAImage.
+    func applyFilter(filter: String) -> RGBAImage {
+        var newImage = self.imageRGBA!
+        // Loop through each pixel of the image
+        for y in 0..<newImage.height{
+            for x in 0..<newImage.width {
+                let index = y*newImage.width + x
+                var pixel = newImage.pixels[index]
+                
+                // Switch-case for different type of filters.
+                switch filter {
+                // Negative of the image
+                case "negative":
+                    pixel.red = UInt8(max(0, min(255,255 - pixel.red)))
+                    pixel.green = UInt8(max(0, min(255,255 - pixel.green)))
+                    pixel.blue = UInt8(max(0, min(255,255 - pixel.blue)))
+                    newImage.pixels[index] = pixel
+                // Add red color filter to the whole image.
+                case "redFilter":
+                    pixel.red = UInt8(255)
+                    newImage.pixels[index] = pixel
+                    break
+                // Add green color filter to the whole image.
+                case "greenFilter":
+                    pixel.green = UInt8(255)
+                    newImage.pixels[index] = pixel
+                    break
+                // Add blue color filter to the whole image.
+                case "blueFilter":
+                    pixel.blue = UInt8(255)
+                    newImage.pixels[index] = pixel
+                    break
+                // Make the image either transparent (0) or opaque(255)
+                case "alphaFilter":
+                    pixel.alpha = UInt8(128)
+                    newImage.pixels[index] = pixel
+                    break
+                default:
+                    print("Nothing to do!")
+                    return newImage
+                }
+            }
+        }
+        return newImage
+    }
+    
+    // Apply filter with custom intensity to the image and return the RGBAImage.
+    func applyFilter(filter: String, val: Int) -> RGBAImage {
+        var newImage = self.imageRGBA!
+        // Loop through each pixel of the image
+        for y in 0..<newImage.height{
+            for x in 0..<newImage.width {
+                let index = y*newImage.width + x
+                var pixel = newImage.pixels[index]
+                
+                // Switch-case for different type of filters.
+                switch filter {
+                // Add red color filter to the whole image.
+                case "redFilter":
+                    pixel.red = UInt8(max(0, min(255,val)))
+                    newImage.pixels[index] = pixel
+                    break
+                // Add green color filter to the whole image.
+                case "greenFilter":
+                    pixel.green = UInt8(max(0, min(255,val)))
+                    newImage.pixels[index] = pixel
+                    break
+                // Add blue color filter to the whole image.
+                case "blueFilter":
+                    pixel.blue = UInt8(max(0, min(255,val)))
+                    newImage.pixels[index] = pixel
+                    break
+                // Make the image either transparent (0) or opaque(255)
+                case "alphaFilter":
+                    pixel.alpha = UInt8(max(0, min(255,val)))
+                    newImage.pixels[index] = pixel
+                    break
+                default:
+                    print("Nothing to do!")
+                    return newImage
+                }
+            }
+        }
+        return newImage
+    }
+}
\ No newline at end of file
diff --git a/ImageFilter/RGBAImage.swift b/ImageFilter/RGBAImage.swift
new file mode 100644
index 0000000..cd2cb29
--- /dev/null
+++ b/ImageFilter/RGBAImage.swift
@@ -0,0 +1,92 @@
+import UIKit
+
+public struct Pixel {
+    public var value: UInt32
+    
+    public var red: UInt8 {
+        get {
+            return UInt8(value & 0xFF)
+        }
+        set {
+            value = UInt32(newValue) | (value & 0xFFFFFF00)
+        }
+    }
+    
+    public var green: UInt8 {
+        get {
+            return UInt8((value >> 8) & 0xFF)
+        }
+        set {
+            value = (UInt32(newValue) << 8) | (value & 0xFFFF00FF)
+        }
+    }
+    
+    public var blue: UInt8 {
+        get {
+            return UInt8((value >> 16) & 0xFF)
+        }
+        set {
+            value = (UInt32(newValue) << 16) | (value & 0xFF00FFFF)
+        }
+    }
+    
+    public var alpha: UInt8 {
+        get {
+            return UInt8((value >> 24) & 0xFF)
+        }
+        set {
+            value = (UInt32(newValue) << 24) | (value & 0x00FFFFFF)
+        }
+    }
+}
+
+public struct RGBAImage {
+    public var pixels: [Pixel]
+    
+    public var width: Int
+    public var height: Int
+    
+    public init?(image: UIImage) {
+        guard let cgImage = image.CGImage else { return nil }
+        
+        // Redraw image for correct pixel format
+        let colorSpace = CGColorSpaceCreateDeviceRGB()
+        
+        var bitmapInfo: UInt32 = CGBitmapInfo.ByteOrder32Big.rawValue
+        bitmapInfo |= CGImageAlphaInfo.PremultipliedLast.rawValue & CGBitmapInfo.AlphaInfoMask.rawValue
+        
+        width = Int(image.size.width)
+        height = Int(image.size.height)
+        let bytesPerRow = width * 4
+        
+        let imageData = UnsafeMutablePointer<Pixel>.alloc(width * height)
+        
+        guard let imageContext = CGBitmapContextCreate(imageData, width, height, 8, bytesPerRow, colorSpace, bitmapInfo) else { return nil }
+        CGContextDrawImage(imageContext, CGRect(origin: CGPointZero, size: image.size), cgImage)
+        
+        let bufferPointer = UnsafeMutableBufferPointer<Pixel>(start: imageData, count: width * height)
+        pixels = Array(bufferPointer)
+        
+        imageData.destroy()
+        imageData.dealloc(width * height)
+    }
+    
+    public func toUIImage() -> UIImage? {
+        let colorSpace = CGColorSpaceCreateDeviceRGB()
+        var bitmapInfo: UInt32 = CGBitmapInfo.ByteOrder32Big.rawValue
+        bitmapInfo |= CGImageAlphaInfo.PremultipliedLast.rawValue & CGBitmapInfo.AlphaInfoMask.rawValue
+        
+        let bytesPerRow = width * 4
+        
+        let imageDataReference = UnsafeMutablePointer<Pixel>(pixels)
+        defer {
+            imageDataReference.destroy()
+        }
+        let imageContext = CGBitmapContextCreateWithData(imageDataReference, width, height, 8, bytesPerRow, colorSpace, bitmapInfo, nil, nil)
+        
+        guard let cgImage = CGBitmapContextCreateImage(imageContext) else {return nil}
+        let image = UIImage(CGImage: cgImage)
+        
+        return image
+    }
+}
\ No newline at end of file
diff --git a/ImageFilter/ViewController.swift b/ImageFilter/ViewController.swift
index 9d7b860..32ea53c 100644
--- a/ImageFilter/ViewController.swift
+++ b/ImageFilter/ViewController.swift
@@ -10,9 +10,21 @@ import UIKit
 
 class ViewController: UIViewController {
 
+    // Interface Builer Outlet
+    @IBOutlet weak var imageView: UIImageView!
+    
     override func viewDidLoad() {
         super.viewDidLoad()
         // Do any additional setup after loading the view, typically from a nib.
+        
+        let image = UIImage(named: "sample")!
+        let imageProcessor:ImageProcessor = ImageProcessor(imageRGBA: RGBAImage(image:image)!)!
+        
+        let filteredImage = imageProcessor.applyFilter("negative").toUIImage()
+        
+        imageView.image = filteredImage
+        
+        print("Execution finished")
     }
 
     override func didReceiveMemoryWarning() {

From 3bc31c74ce699cffa3bcca5e4dc9612a1cd616ef Mon Sep 17 00:00:00 2001
From: Jackson Isaac <jacksonisaac2008@gmail.com>
Date: Sat, 5 Nov 2016 20:25:29 +0530
Subject: [PATCH 02/18] Add Button to the layout

---
 ImageFilter/Base.lproj/Main.storyboard | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/ImageFilter/Base.lproj/Main.storyboard b/ImageFilter/Base.lproj/Main.storyboard
index 51b821d..6ea12fc 100644
--- a/ImageFilter/Base.lproj/Main.storyboard
+++ b/ImageFilter/Base.lproj/Main.storyboard
@@ -20,6 +20,10 @@
                                 <rect key="frame" x="0.0" y="0.0" width="284" height="302"/>
                                 <color key="backgroundColor" red="0.0" green="0.0" blue="0.0" alpha="1" colorSpace="calibratedRGB"/>
                             </imageView>
+                            <button opaque="NO" contentMode="scaleToFill" fixedFrame="YES" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="lFs-ZZ-m4V">
+                                <rect key="frame" x="0.0" y="338" width="284" height="30"/>
+                                <state key="normal" title="Show Filtered Image"/>
+                            </button>
                         </subviews>
                         <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
                     </view>

From 60b62b42f3f41567ef518c9094f36325b10f6f23 Mon Sep 17 00:00:00 2001
From: Jackson Isaac <jacksonisaac2008@gmail.com>
Date: Sat, 5 Nov 2016 20:28:16 +0530
Subject: [PATCH 03/18] Add listener to the imageToggle button

---
 ImageFilter/Base.lproj/Main.storyboard |  4 ++++
 ImageFilter/ViewController.swift       | 12 ++++++++----
 2 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/ImageFilter/Base.lproj/Main.storyboard b/ImageFilter/Base.lproj/Main.storyboard
index 6ea12fc..be4e53b 100644
--- a/ImageFilter/Base.lproj/Main.storyboard
+++ b/ImageFilter/Base.lproj/Main.storyboard
@@ -23,11 +23,15 @@
                             <button opaque="NO" contentMode="scaleToFill" fixedFrame="YES" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="lFs-ZZ-m4V">
                                 <rect key="frame" x="0.0" y="338" width="284" height="30"/>
                                 <state key="normal" title="Show Filtered Image"/>
+                                <connections>
+                                    <action selector="onImageToggle:" destination="BYZ-38-t0r" eventType="touchUpInside" id="8sb-8V-oSp"/>
+                                </connections>
                             </button>
                         </subviews>
                         <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
                     </view>
                     <connections>
+                        <outlet property="imageToggle" destination="lFs-ZZ-m4V" id="UXU-Yn-Zbq"/>
                         <outlet property="imageView" destination="jvM-47-h1h" id="kUf-7f-KsO"/>
                     </connections>
                 </viewController>
diff --git a/ImageFilter/ViewController.swift b/ImageFilter/ViewController.swift
index 32ea53c..20c2fa7 100644
--- a/ImageFilter/ViewController.swift
+++ b/ImageFilter/ViewController.swift
@@ -9,10 +9,16 @@
 import UIKit
 
 class ViewController: UIViewController {
-
+    
+    var filteredImage: UIImage?
+    
     // Interface Builer Outlet
     @IBOutlet weak var imageView: UIImageView!
+    @IBOutlet weak var imageToggle: UIButton!
     
+    @IBAction func onImageToggle(sender: UIButton) {
+        imageView.image = filteredImage
+    }
     override func viewDidLoad() {
         super.viewDidLoad()
         // Do any additional setup after loading the view, typically from a nib.
@@ -20,9 +26,7 @@ class ViewController: UIViewController {
         let image = UIImage(named: "sample")!
         let imageProcessor:ImageProcessor = ImageProcessor(imageRGBA: RGBAImage(image:image)!)!
         
-        let filteredImage = imageProcessor.applyFilter("negative").toUIImage()
-        
-        imageView.image = filteredImage
+        filteredImage = imageProcessor.applyFilter("negative").toUIImage()
         
         print("Execution finished")
     }

From e9bb2bb9fbb6bc4a6c59633039786c1289c6744c Mon Sep 17 00:00:00 2001
From: Jackson Isaac <jacksonisaac2008@gmail.com>
Date: Sat, 5 Nov 2016 21:20:30 +0530
Subject: [PATCH 04/18] Update button toggle feature

---
 ImageFilter/Base.lproj/Main.storyboard |  1 +
 ImageFilter/ViewController.swift       | 11 +++++++++--
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/ImageFilter/Base.lproj/Main.storyboard b/ImageFilter/Base.lproj/Main.storyboard
index be4e53b..3630eb4 100644
--- a/ImageFilter/Base.lproj/Main.storyboard
+++ b/ImageFilter/Base.lproj/Main.storyboard
@@ -23,6 +23,7 @@
                             <button opaque="NO" contentMode="scaleToFill" fixedFrame="YES" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="lFs-ZZ-m4V">
                                 <rect key="frame" x="0.0" y="338" width="284" height="30"/>
                                 <state key="normal" title="Show Filtered Image"/>
+                                <state key="selected" title="Show Before Image"/>
                                 <connections>
                                     <action selector="onImageToggle:" destination="BYZ-38-t0r" eventType="touchUpInside" id="8sb-8V-oSp"/>
                                 </connections>
diff --git a/ImageFilter/ViewController.swift b/ImageFilter/ViewController.swift
index 20c2fa7..255bb2f 100644
--- a/ImageFilter/ViewController.swift
+++ b/ImageFilter/ViewController.swift
@@ -17,12 +17,19 @@ class ViewController: UIViewController {
     @IBOutlet weak var imageToggle: UIButton!
     
     @IBAction func onImageToggle(sender: UIButton) {
-        imageView.image = filteredImage
+        if imageToggle.selected {
+            let image = UIImage(named: "sample")!
+            imageView.image = image
+            imageToggle.selected = false
+        } else {
+            imageView.image = filteredImage
+            imageToggle.selected = true
+        }
     }
     override func viewDidLoad() {
         super.viewDidLoad()
         // Do any additional setup after loading the view, typically from a nib.
-        
+
         let image = UIImage(named: "sample")!
         let imageProcessor:ImageProcessor = ImageProcessor(imageRGBA: RGBAImage(image:image)!)!
         

From c40b62b53ab080be557df7135d5a16204bf3db26 Mon Sep 17 00:00:00 2001
From: Jackson Isaac <jacksonisaac2008@gmail.com>
Date: Sun, 6 Nov 2016 01:47:20 +0530
Subject: [PATCH 05/18] Update project syntax to Swift 3

---
 ImageFilter.xcodeproj/project.pbxproj         | 11 ++++++-
 .../xcschemes/ImageFilter.xcscheme            |  2 +-
 ImageFilter/AppDelegate.swift                 | 12 +++----
 ImageFilter/ImageProcessor.swift              | 12 +++----
 ImageFilter/RGBAImage.swift                   | 32 +++++++++----------
 ImageFilter/ViewController.swift              |  8 ++---
 6 files changed, 43 insertions(+), 34 deletions(-)

diff --git a/ImageFilter.xcodeproj/project.pbxproj b/ImageFilter.xcodeproj/project.pbxproj
index aa8b6ca..34cc386 100644
--- a/ImageFilter.xcodeproj/project.pbxproj
+++ b/ImageFilter.xcodeproj/project.pbxproj
@@ -97,12 +97,13 @@
 			isa = PBXProject;
 			attributes = {
 				LastSwiftUpdateCheck = 0730;
-				LastUpgradeCheck = 0730;
+				LastUpgradeCheck = 0810;
 				ORGANIZATIONNAME = "Jackson Isaac";
 				TargetAttributes = {
 					2987A54A1DCD1BAE001FDF06 = {
 						CreatedOnToolsVersion = 7.3.1;
 						DevelopmentTeam = M89DBD7R74;
+						LastSwiftMigration = 0810;
 					};
 				};
 			};
@@ -185,8 +186,10 @@
 				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
 				CLANG_WARN_EMPTY_BODY = YES;
 				CLANG_WARN_ENUM_CONVERSION = YES;
+				CLANG_WARN_INFINITE_RECURSION = YES;
 				CLANG_WARN_INT_CONVERSION = YES;
 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_SUSPICIOUS_MOVE = YES;
 				CLANG_WARN_UNREACHABLE_CODE = YES;
 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
 				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
@@ -231,8 +234,10 @@
 				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
 				CLANG_WARN_EMPTY_BODY = YES;
 				CLANG_WARN_ENUM_CONVERSION = YES;
+				CLANG_WARN_INFINITE_RECURSION = YES;
 				CLANG_WARN_INT_CONVERSION = YES;
 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_SUSPICIOUS_MOVE = YES;
 				CLANG_WARN_UNREACHABLE_CODE = YES;
 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
 				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
@@ -251,6 +256,7 @@
 				IPHONEOS_DEPLOYMENT_TARGET = 9.3;
 				MTL_ENABLE_DEBUG_INFO = NO;
 				SDKROOT = iphoneos;
+				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
 				TARGETED_DEVICE_FAMILY = "1,2";
 				VALIDATE_PRODUCT = YES;
 			};
@@ -268,6 +274,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = com.jacksonisaac.ImageFilter;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				PROVISIONING_PROFILE = "";
+				SWIFT_VERSION = 3.0;
 			};
 			name = Debug;
 		};
@@ -283,6 +290,7 @@
 				PRODUCT_BUNDLE_IDENTIFIER = com.jacksonisaac.ImageFilter;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 				PROVISIONING_PROFILE = "";
+				SWIFT_VERSION = 3.0;
 			};
 			name = Release;
 		};
@@ -305,6 +313,7 @@
 				2987A55F1DCD1BAF001FDF06 /* Release */,
 			);
 			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
 		};
 /* End XCConfigurationList section */
 	};
diff --git a/ImageFilter.xcodeproj/xcuserdata/jacksonisaac.xcuserdatad/xcschemes/ImageFilter.xcscheme b/ImageFilter.xcodeproj/xcuserdata/jacksonisaac.xcuserdatad/xcschemes/ImageFilter.xcscheme
index 871169c..0160dbe 100644
--- a/ImageFilter.xcodeproj/xcuserdata/jacksonisaac.xcuserdatad/xcschemes/ImageFilter.xcscheme
+++ b/ImageFilter.xcodeproj/xcuserdata/jacksonisaac.xcuserdatad/xcschemes/ImageFilter.xcscheme
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0730"
+   LastUpgradeVersion = "0810"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"
diff --git a/ImageFilter/AppDelegate.swift b/ImageFilter/AppDelegate.swift
index 595d48d..5bf432c 100644
--- a/ImageFilter/AppDelegate.swift
+++ b/ImageFilter/AppDelegate.swift
@@ -14,30 +14,30 @@ class AppDelegate: UIResponder, UIApplicationDelegate {
     var window: UIWindow?
 
 
-    func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
+    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
         // Override point for customization after application launch.
         return true
     }
 
-    func applicationWillResignActive(application: UIApplication) {
+    func applicationWillResignActive(_ application: UIApplication) {
         // 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.
         // 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.
     }
 
-    func applicationDidEnterBackground(application: UIApplication) {
+    func applicationDidEnterBackground(_ application: UIApplication) {
         // 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.
         // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
     }
 
-    func applicationWillEnterForeground(application: UIApplication) {
+    func applicationWillEnterForeground(_ application: UIApplication) {
         // 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.
     }
 
-    func applicationDidBecomeActive(application: UIApplication) {
+    func applicationDidBecomeActive(_ application: UIApplication) {
         // 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.
     }
 
-    func applicationWillTerminate(application: UIApplication) {
+    func applicationWillTerminate(_ application: UIApplication) {
         // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
     }
 
diff --git a/ImageFilter/ImageProcessor.swift b/ImageFilter/ImageProcessor.swift
index 9e12edd..5451316 100644
--- a/ImageFilter/ImageProcessor.swift
+++ b/ImageFilter/ImageProcessor.swift
@@ -38,7 +38,7 @@ class ImageProcessor {
     }
     
     // Apply default filter to the image and return the RGBAImage.
-    func applyFilter(filter: String) -> RGBAImage {
+    func applyFilter(_ filter: String) -> RGBAImage {
         var newImage = self.imageRGBA!
         // Loop through each pixel of the image
         for y in 0..<newImage.height{
@@ -50,9 +50,9 @@ class ImageProcessor {
                 switch filter {
                 // Negative of the image
                 case "negative":
-                    pixel.red = UInt8(max(0, min(255,255 - pixel.red)))
-                    pixel.green = UInt8(max(0, min(255,255 - pixel.green)))
-                    pixel.blue = UInt8(max(0, min(255,255 - pixel.blue)))
+                    pixel.red = UInt8(max(0, min(255,UInt8(255-pixel.red))))
+                    pixel.green = UInt8(max(0, min(255,UInt8(255-pixel.green))))
+                    pixel.blue = UInt8(max(0, min(255,UInt8(255-pixel.blue))))
                     newImage.pixels[index] = pixel
                 // Add red color filter to the whole image.
                 case "redFilter":
@@ -84,7 +84,7 @@ class ImageProcessor {
     }
     
     // Apply filter with custom intensity to the image and return the RGBAImage.
-    func applyFilter(filter: String, val: Int) -> RGBAImage {
+    func applyFilter(_ filter: String, val: Int) -> RGBAImage {
         var newImage = self.imageRGBA!
         // Loop through each pixel of the image
         for y in 0..<newImage.height{
@@ -122,4 +122,4 @@ class ImageProcessor {
         }
         return newImage
     }
-}
\ No newline at end of file
+}
diff --git a/ImageFilter/RGBAImage.swift b/ImageFilter/RGBAImage.swift
index cd2cb29..0b78aad 100644
--- a/ImageFilter/RGBAImage.swift
+++ b/ImageFilter/RGBAImage.swift
@@ -47,46 +47,46 @@ public struct RGBAImage {
     public var height: Int
     
     public init?(image: UIImage) {
-        guard let cgImage = image.CGImage else { return nil }
+        guard let cgImage = image.cgImage else { return nil }
         
         // Redraw image for correct pixel format
         let colorSpace = CGColorSpaceCreateDeviceRGB()
         
-        var bitmapInfo: UInt32 = CGBitmapInfo.ByteOrder32Big.rawValue
-        bitmapInfo |= CGImageAlphaInfo.PremultipliedLast.rawValue & CGBitmapInfo.AlphaInfoMask.rawValue
+        var bitmapInfo: UInt32 = CGBitmapInfo.byteOrder32Big.rawValue
+        bitmapInfo |= CGImageAlphaInfo.premultipliedLast.rawValue & CGBitmapInfo.alphaInfoMask.rawValue
         
         width = Int(image.size.width)
         height = Int(image.size.height)
         let bytesPerRow = width * 4
         
-        let imageData = UnsafeMutablePointer<Pixel>.alloc(width * height)
+        let imageData = UnsafeMutablePointer<Pixel>.allocate(capacity: width * height)
         
-        guard let imageContext = CGBitmapContextCreate(imageData, width, height, 8, bytesPerRow, colorSpace, bitmapInfo) else { return nil }
-        CGContextDrawImage(imageContext, CGRect(origin: CGPointZero, size: image.size), cgImage)
+        guard let imageContext = CGContext(data: imageData, width: width, height: height, bitsPerComponent: 8, bytesPerRow: bytesPerRow, space: colorSpace, bitmapInfo: bitmapInfo) else { return nil }
+        imageContext.draw(cgImage, in: CGRect(origin: CGPoint.zero, size: image.size))
         
         let bufferPointer = UnsafeMutableBufferPointer<Pixel>(start: imageData, count: width * height)
         pixels = Array(bufferPointer)
         
-        imageData.destroy()
-        imageData.dealloc(width * height)
+        imageData.deinitialize()
+        imageData.deallocate(capacity: width * height)
     }
     
     public func toUIImage() -> UIImage? {
         let colorSpace = CGColorSpaceCreateDeviceRGB()
-        var bitmapInfo: UInt32 = CGBitmapInfo.ByteOrder32Big.rawValue
-        bitmapInfo |= CGImageAlphaInfo.PremultipliedLast.rawValue & CGBitmapInfo.AlphaInfoMask.rawValue
+        var bitmapInfo: UInt32 = CGBitmapInfo.byteOrder32Big.rawValue
+        bitmapInfo |= CGImageAlphaInfo.premultipliedLast.rawValue & CGBitmapInfo.alphaInfoMask.rawValue
         
         let bytesPerRow = width * 4
         
-        let imageDataReference = UnsafeMutablePointer<Pixel>(pixels)
+        let imageDataReference = UnsafeMutablePointer<Pixel>(mutating: pixels)
         defer {
-            imageDataReference.destroy()
+            imageDataReference.deinitialize()
         }
-        let imageContext = CGBitmapContextCreateWithData(imageDataReference, width, height, 8, bytesPerRow, colorSpace, bitmapInfo, nil, nil)
+        let imageContext = CGContext(data: imageDataReference, width: width, height: height, bitsPerComponent: 8, bytesPerRow: bytesPerRow, space: colorSpace, bitmapInfo: bitmapInfo, releaseCallback: nil, releaseInfo: nil)
         
-        guard let cgImage = CGBitmapContextCreateImage(imageContext) else {return nil}
-        let image = UIImage(CGImage: cgImage)
+        guard let cgImage = imageContext?.makeImage() else {return nil}
+        let image = UIImage(cgImage: cgImage)
         
         return image
     }
-}
\ No newline at end of file
+}
diff --git a/ImageFilter/ViewController.swift b/ImageFilter/ViewController.swift
index 255bb2f..f5fc274 100644
--- a/ImageFilter/ViewController.swift
+++ b/ImageFilter/ViewController.swift
@@ -16,14 +16,14 @@ class ViewController: UIViewController {
     @IBOutlet weak var imageView: UIImageView!
     @IBOutlet weak var imageToggle: UIButton!
     
-    @IBAction func onImageToggle(sender: UIButton) {
-        if imageToggle.selected {
+    @IBAction func onImageToggle(_ sender: UIButton) {
+        if imageToggle.isSelected {
             let image = UIImage(named: "sample")!
             imageView.image = image
-            imageToggle.selected = false
+            imageToggle.isSelected = false
         } else {
             imageView.image = filteredImage
-            imageToggle.selected = true
+            imageToggle.isSelected = true
         }
     }
     override func viewDidLoad() {

From 73fe99f253ddf5d977040a19fd4d52536218263d Mon Sep 17 00:00:00 2001
From: Jackson Isaac <jacksonisaac2008@gmail.com>
Date: Mon, 7 Nov 2016 14:06:58 +0530
Subject: [PATCH 06/18] Add UIStack Layout

---
 ImageFilter/Base.lproj/Main.storyboard | 107 +++++++++++++++++++++----
 1 file changed, 90 insertions(+), 17 deletions(-)

diff --git a/ImageFilter/Base.lproj/Main.storyboard b/ImageFilter/Base.lproj/Main.storyboard
index 3630eb4..f3d09eb 100644
--- a/ImageFilter/Base.lproj/Main.storyboard
+++ b/ImageFilter/Base.lproj/Main.storyboard
@@ -1,7 +1,11 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="10117" systemVersion="16B2555" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" initialViewController="BYZ-38-t0r">
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="11542" systemVersion="16B2555" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" colorMatched="YES" initialViewController="BYZ-38-t0r">
+    <device id="retina4_7" orientation="portrait">
+        <adaptation id="fullscreen"/>
+    </device>
     <dependencies>
-        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="10085"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="11524"/>
+        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
     </dependencies>
     <scenes>
         <!--View Controller-->
@@ -13,23 +17,92 @@
                         <viewControllerLayoutGuide type="bottom" id="wfy-db-euE"/>
                     </layoutGuides>
                     <view key="view" contentMode="scaleToFill" id="8bC-Xf-vdC">
-                        <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
+                        <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                         <subviews>
-                            <imageView userInteractionEnabled="NO" contentMode="scaleAspectFit" horizontalHuggingPriority="251" verticalHuggingPriority="251" fixedFrame="YES" image="sample" translatesAutoresizingMaskIntoConstraints="NO" id="jvM-47-h1h">
-                                <rect key="frame" x="0.0" y="0.0" width="284" height="302"/>
-                                <color key="backgroundColor" red="0.0" green="0.0" blue="0.0" alpha="1" colorSpace="calibratedRGB"/>
-                            </imageView>
-                            <button opaque="NO" contentMode="scaleToFill" fixedFrame="YES" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="lFs-ZZ-m4V">
-                                <rect key="frame" x="0.0" y="338" width="284" height="30"/>
-                                <state key="normal" title="Show Filtered Image"/>
-                                <state key="selected" title="Show Before Image"/>
-                                <connections>
-                                    <action selector="onImageToggle:" destination="BYZ-38-t0r" eventType="touchUpInside" id="8sb-8V-oSp"/>
-                                </connections>
-                            </button>
+                            <stackView opaque="NO" contentMode="scaleToFill" axis="vertical" translatesAutoresizingMaskIntoConstraints="NO" id="pl3-jK-3lH">
+                                <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
+                                <subviews>
+                                    <imageView userInteractionEnabled="NO" contentMode="scaleAspectFit" horizontalHuggingPriority="251" verticalHuggingPriority="251" image="sample" translatesAutoresizingMaskIntoConstraints="NO" id="jvM-47-h1h">
+                                        <rect key="frame" x="0.0" y="0.0" width="375" height="623"/>
+                                        <color key="backgroundColor" red="0.0" green="0.0" blue="0.0" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+                                    </imageView>
+                                    <view contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="pnf-Z3-dkZ">
+                                        <rect key="frame" x="0.0" y="623" width="375" height="44"/>
+                                        <subviews>
+                                            <stackView opaque="NO" contentMode="scaleToFill" distribution="fillEqually" translatesAutoresizingMaskIntoConstraints="NO" id="EV1-ne-91j">
+                                                <rect key="frame" x="0.0" y="0.0" width="375" height="44"/>
+                                                <subviews>
+                                                    <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="lFs-ZZ-m4V">
+                                                        <rect key="frame" x="0.0" y="0.0" width="94" height="44"/>
+                                                        <constraints>
+                                                            <constraint firstAttribute="height" constant="44" id="5ex-Ny-P4F"/>
+                                                        </constraints>
+                                                        <state key="normal" title="New Photo"/>
+                                                        <state key="selected" title="Show Before Image"/>
+                                                        <connections>
+                                                            <action selector="onImageToggle:" destination="BYZ-38-t0r" eventType="touchUpInside" id="8sb-8V-oSp"/>
+                                                        </connections>
+                                                    </button>
+                                                    <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="nja-km-Ll8">
+                                                        <rect key="frame" x="94" y="0.0" width="93.5" height="44"/>
+                                                        <constraints>
+                                                            <constraint firstAttribute="height" constant="44" id="5W3-LS-log"/>
+                                                        </constraints>
+                                                        <state key="normal" title="Filter"/>
+                                                        <state key="selected" title="Show Before Image"/>
+                                                        <connections>
+                                                            <action selector="onImageToggle:" destination="BYZ-38-t0r" eventType="touchUpInside" id="b5V-zF-v3U"/>
+                                                        </connections>
+                                                    </button>
+                                                    <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="0m3-SR-OMo">
+                                                        <rect key="frame" x="187.5" y="0.0" width="94" height="44"/>
+                                                        <constraints>
+                                                            <constraint firstAttribute="height" constant="44" id="TUS-KC-l22"/>
+                                                        </constraints>
+                                                        <state key="normal" title="Compare"/>
+                                                        <state key="selected" title="Show Before Image"/>
+                                                        <connections>
+                                                            <action selector="onImageToggle:" destination="BYZ-38-t0r" eventType="touchUpInside" id="UHe-u1-ky8"/>
+                                                        </connections>
+                                                    </button>
+                                                    <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="bdT-n9-wpu">
+                                                        <rect key="frame" x="281.5" y="0.0" width="93.5" height="44"/>
+                                                        <constraints>
+                                                            <constraint firstAttribute="height" constant="44" id="Hfe-jo-DIR"/>
+                                                        </constraints>
+                                                        <state key="normal" title="Share"/>
+                                                        <state key="selected" title="Show Before Image"/>
+                                                        <connections>
+                                                            <action selector="onImageToggle:" destination="BYZ-38-t0r" eventType="touchUpInside" id="fG7-H4-Aid"/>
+                                                        </connections>
+                                                    </button>
+                                                </subviews>
+                                                <constraints>
+                                                    <constraint firstItem="lFs-ZZ-m4V" firstAttribute="width" secondItem="nja-km-Ll8" secondAttribute="width" id="Y0W-9M-aDB"/>
+                                                    <constraint firstItem="0m3-SR-OMo" firstAttribute="width" secondItem="bdT-n9-wpu" secondAttribute="width" id="hfk-hB-Qyo"/>
+                                                    <constraint firstItem="nja-km-Ll8" firstAttribute="width" secondItem="0m3-SR-OMo" secondAttribute="width" id="ojv-PH-Yak"/>
+                                                </constraints>
+                                            </stackView>
+                                        </subviews>
+                                        <color key="backgroundColor" white="1" alpha="1" colorSpace="calibratedWhite"/>
+                                        <constraints>
+                                            <constraint firstAttribute="bottom" secondItem="EV1-ne-91j" secondAttribute="bottom" id="61n-LL-rA9"/>
+                                            <constraint firstItem="EV1-ne-91j" firstAttribute="leading" secondItem="pnf-Z3-dkZ" secondAttribute="leading" id="OSN-20-RcN"/>
+                                            <constraint firstAttribute="trailing" secondItem="EV1-ne-91j" secondAttribute="trailing" id="con-B3-UIF"/>
+                                            <constraint firstItem="EV1-ne-91j" firstAttribute="top" secondItem="pnf-Z3-dkZ" secondAttribute="top" id="sBO-uK-kH7"/>
+                                        </constraints>
+                                    </view>
+                                </subviews>
+                            </stackView>
                         </subviews>
-                        <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
+                        <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+                        <constraints>
+                            <constraint firstItem="pl3-jK-3lH" firstAttribute="top" secondItem="8bC-Xf-vdC" secondAttribute="top" id="JIt-mP-BFc"/>
+                            <constraint firstItem="pl3-jK-3lH" firstAttribute="leading" secondItem="8bC-Xf-vdC" secondAttribute="leading" id="pa3-bI-Gzu"/>
+                            <constraint firstItem="wfy-db-euE" firstAttribute="top" secondItem="pl3-jK-3lH" secondAttribute="bottom" id="uq3-1b-A5B"/>
+                            <constraint firstAttribute="trailing" secondItem="pl3-jK-3lH" secondAttribute="trailing" id="vnx-Ay-1YK"/>
+                        </constraints>
                     </view>
                     <connections>
                         <outlet property="imageToggle" destination="lFs-ZZ-m4V" id="UXU-Yn-Zbq"/>
@@ -38,7 +111,7 @@
                 </viewController>
                 <placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
             </objects>
-            <point key="canvasLocation" x="217" y="-4"/>
+            <point key="canvasLocation" x="216.80000000000001" y="-4.0479760119940034"/>
         </scene>
     </scenes>
     <resources>

From 44716f309d8613d928af772dbaa034bc8a05df11 Mon Sep 17 00:00:00 2001
From: Jackson Isaac <jacksonisaac2008@gmail.com>
Date: Mon, 7 Nov 2016 14:10:36 +0530
Subject: [PATCH 07/18] Remove erroneous constraints

---
 ImageFilter/Base.lproj/Main.storyboard | 1 -
 1 file changed, 1 deletion(-)

diff --git a/ImageFilter/Base.lproj/Main.storyboard b/ImageFilter/Base.lproj/Main.storyboard
index f3d09eb..2f72b64 100644
--- a/ImageFilter/Base.lproj/Main.storyboard
+++ b/ImageFilter/Base.lproj/Main.storyboard
@@ -80,7 +80,6 @@
                                                 </subviews>
                                                 <constraints>
                                                     <constraint firstItem="lFs-ZZ-m4V" firstAttribute="width" secondItem="nja-km-Ll8" secondAttribute="width" id="Y0W-9M-aDB"/>
-                                                    <constraint firstItem="0m3-SR-OMo" firstAttribute="width" secondItem="bdT-n9-wpu" secondAttribute="width" id="hfk-hB-Qyo"/>
                                                     <constraint firstItem="nja-km-Ll8" firstAttribute="width" secondItem="0m3-SR-OMo" secondAttribute="width" id="ojv-PH-Yak"/>
                                                 </constraints>
                                             </stackView>

From 29f0156d2501fdd95c732358b10d0f7dcd5c0e9d Mon Sep 17 00:00:00 2001
From: Jackson Isaac <jacksonisaac2008@gmail.com>
Date: Mon, 7 Nov 2016 18:55:47 +0530
Subject: [PATCH 08/18] Add a menu view

---
 ImageFilter/Base.lproj/Main.storyboard | 38 ++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/ImageFilter/Base.lproj/Main.storyboard b/ImageFilter/Base.lproj/Main.storyboard
index 2f72b64..eeed6e5 100644
--- a/ImageFilter/Base.lproj/Main.storyboard
+++ b/ImageFilter/Base.lproj/Main.storyboard
@@ -109,6 +109,44 @@
                     </connections>
                 </viewController>
                 <placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
+                <view contentMode="scaleToFill" id="qsX-8E-MwU">
+                    <rect key="frame" x="0.0" y="0.0" width="240" height="128"/>
+                    <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
+                    <subviews>
+                        <stackView opaque="NO" contentMode="scaleToFill" distribution="fillEqually" translatesAutoresizingMaskIntoConstraints="NO" id="uVz-YS-v3x">
+                            <rect key="frame" x="0.0" y="0.0" width="240" height="128"/>
+                            <subviews>
+                                <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="EZu-eH-VxY">
+                                    <rect key="frame" x="0.0" y="0.0" width="48" height="128"/>
+                                    <state key="normal" title="Red"/>
+                                </button>
+                                <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="3OM-BX-YIl">
+                                    <rect key="frame" x="48" y="0.0" width="48" height="128"/>
+                                    <state key="normal" title="Blue"/>
+                                </button>
+                                <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="Hjs-OE-0AZ">
+                                    <rect key="frame" x="96" y="0.0" width="48" height="128"/>
+                                    <state key="normal" title="Green"/>
+                                </button>
+                                <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="71X-c0-do5">
+                                    <rect key="frame" x="144" y="0.0" width="48" height="128"/>
+                                    <state key="normal" title="Yellow"/>
+                                </button>
+                                <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="oHl-o3-elH">
+                                    <rect key="frame" x="192" y="0.0" width="48" height="128"/>
+                                    <state key="normal" title="Purple"/>
+                                </button>
+                            </subviews>
+                        </stackView>
+                    </subviews>
+                    <color key="backgroundColor" white="1" alpha="1" colorSpace="calibratedWhite"/>
+                    <constraints>
+                        <constraint firstAttribute="trailing" secondItem="uVz-YS-v3x" secondAttribute="trailing" id="2A5-Lt-qFi"/>
+                        <constraint firstItem="uVz-YS-v3x" firstAttribute="top" secondItem="qsX-8E-MwU" secondAttribute="top" id="6vf-xf-fa3"/>
+                        <constraint firstAttribute="bottom" secondItem="uVz-YS-v3x" secondAttribute="bottom" id="BdU-TT-Z8f"/>
+                        <constraint firstItem="uVz-YS-v3x" firstAttribute="leading" secondItem="qsX-8E-MwU" secondAttribute="leading" id="uRE-aO-Gzf"/>
+                    </constraints>
+                </view>
             </objects>
             <point key="canvasLocation" x="216.80000000000001" y="-4.0479760119940034"/>
         </scene>

From 87e1b877e3a1a43e838ac25799e628939ea59743 Mon Sep 17 00:00:00 2001
From: Jackson Isaac <jacksonisaac2008@gmail.com>
Date: Mon, 7 Nov 2016 19:23:00 +0530
Subject: [PATCH 09/18] Add a secondary menu and remove filter code.

---
 ImageFilter/Base.lproj/Main.storyboard | 20 ++++----------------
 ImageFilter/ViewController.swift       | 26 ++++++++------------------
 2 files changed, 12 insertions(+), 34 deletions(-)

diff --git a/ImageFilter/Base.lproj/Main.storyboard b/ImageFilter/Base.lproj/Main.storyboard
index eeed6e5..bc788ba 100644
--- a/ImageFilter/Base.lproj/Main.storyboard
+++ b/ImageFilter/Base.lproj/Main.storyboard
@@ -40,9 +40,6 @@
                                                         </constraints>
                                                         <state key="normal" title="New Photo"/>
                                                         <state key="selected" title="Show Before Image"/>
-                                                        <connections>
-                                                            <action selector="onImageToggle:" destination="BYZ-38-t0r" eventType="touchUpInside" id="8sb-8V-oSp"/>
-                                                        </connections>
                                                     </button>
                                                     <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="nja-km-Ll8">
                                                         <rect key="frame" x="94" y="0.0" width="93.5" height="44"/>
@@ -50,9 +47,8 @@
                                                             <constraint firstAttribute="height" constant="44" id="5W3-LS-log"/>
                                                         </constraints>
                                                         <state key="normal" title="Filter"/>
-                                                        <state key="selected" title="Show Before Image"/>
                                                         <connections>
-                                                            <action selector="onImageToggle:" destination="BYZ-38-t0r" eventType="touchUpInside" id="b5V-zF-v3U"/>
+                                                            <action selector="onFilter:" destination="BYZ-38-t0r" eventType="touchUpInside" id="1dM-7t-Jcu"/>
                                                         </connections>
                                                     </button>
                                                     <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="0m3-SR-OMo">
@@ -62,9 +58,6 @@
                                                         </constraints>
                                                         <state key="normal" title="Compare"/>
                                                         <state key="selected" title="Show Before Image"/>
-                                                        <connections>
-                                                            <action selector="onImageToggle:" destination="BYZ-38-t0r" eventType="touchUpInside" id="UHe-u1-ky8"/>
-                                                        </connections>
                                                     </button>
                                                     <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="bdT-n9-wpu">
                                                         <rect key="frame" x="281.5" y="0.0" width="93.5" height="44"/>
@@ -73,15 +66,8 @@
                                                         </constraints>
                                                         <state key="normal" title="Share"/>
                                                         <state key="selected" title="Show Before Image"/>
-                                                        <connections>
-                                                            <action selector="onImageToggle:" destination="BYZ-38-t0r" eventType="touchUpInside" id="fG7-H4-Aid"/>
-                                                        </connections>
                                                     </button>
                                                 </subviews>
-                                                <constraints>
-                                                    <constraint firstItem="lFs-ZZ-m4V" firstAttribute="width" secondItem="nja-km-Ll8" secondAttribute="width" id="Y0W-9M-aDB"/>
-                                                    <constraint firstItem="nja-km-Ll8" firstAttribute="width" secondItem="0m3-SR-OMo" secondAttribute="width" id="ojv-PH-Yak"/>
-                                                </constraints>
                                             </stackView>
                                         </subviews>
                                         <color key="backgroundColor" white="1" alpha="1" colorSpace="calibratedWhite"/>
@@ -104,8 +90,10 @@
                         </constraints>
                     </view>
                     <connections>
-                        <outlet property="imageToggle" destination="lFs-ZZ-m4V" id="UXU-Yn-Zbq"/>
+                        <outlet property="bottomMenu" destination="pnf-Z3-dkZ" id="JcW-ZN-8lB"/>
+                        <outlet property="filterButton" destination="nja-km-Ll8" id="NTh-z9-BGC"/>
                         <outlet property="imageView" destination="jvM-47-h1h" id="kUf-7f-KsO"/>
+                        <outlet property="secondaryMenu" destination="qsX-8E-MwU" id="iEw-yJ-4pA"/>
                     </connections>
                 </viewController>
                 <placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
diff --git a/ImageFilter/ViewController.swift b/ImageFilter/ViewController.swift
index f5fc274..59794b3 100644
--- a/ImageFilter/ViewController.swift
+++ b/ImageFilter/ViewController.swift
@@ -14,28 +14,15 @@ class ViewController: UIViewController {
     
     // Interface Builer Outlet
     @IBOutlet weak var imageView: UIImageView!
-    @IBOutlet weak var imageToggle: UIButton!
     
-    @IBAction func onImageToggle(_ sender: UIButton) {
-        if imageToggle.isSelected {
-            let image = UIImage(named: "sample")!
-            imageView.image = image
-            imageToggle.isSelected = false
-        } else {
-            imageView.image = filteredImage
-            imageToggle.isSelected = true
-        }
-    }
+    @IBOutlet var secondaryMenu: UIView!
+    @IBOutlet var bottomMenu: UIView!
+    
+    @IBOutlet var filterButton: UIButton!
+    
     override func viewDidLoad() {
         super.viewDidLoad()
         // Do any additional setup after loading the view, typically from a nib.
-
-        let image = UIImage(named: "sample")!
-        let imageProcessor:ImageProcessor = ImageProcessor(imageRGBA: RGBAImage(image:image)!)!
-        
-        filteredImage = imageProcessor.applyFilter("negative").toUIImage()
-        
-        print("Execution finished")
     }
 
     override func didReceiveMemoryWarning() {
@@ -43,6 +30,9 @@ class ViewController: UIViewController {
         // Dispose of any resources that can be recreated.
     }
 
+    @IBAction func onFilter(_ sender: Any) {
+        view.addSubview(secondaryMenu)
+    }
 
 }
 

From c4ec1d29af8ec9ae859b7a771eab8a40a962dc15 Mon Sep 17 00:00:00 2001
From: Jackson Isaac <jacksonisaac2008@gmail.com>
Date: Tue, 8 Nov 2016 13:03:22 +0530
Subject: [PATCH 10/18] Add fade animation to secondary menu

---
 ImageFilter/ViewController.swift | 44 +++++++++++++++++++++++++++++++-
 1 file changed, 43 insertions(+), 1 deletion(-)

diff --git a/ImageFilter/ViewController.swift b/ImageFilter/ViewController.swift
index 59794b3..6c053f7 100644
--- a/ImageFilter/ViewController.swift
+++ b/ImageFilter/ViewController.swift
@@ -23,6 +23,11 @@ class ViewController: UIViewController {
     override func viewDidLoad() {
         super.viewDidLoad()
         // Do any additional setup after loading the view, typically from a nib.
+        
+        secondaryMenu.backgroundColor = UIColor.white.withAlphaComponent(0.5)
+    
+        secondaryMenu.translatesAutoresizingMaskIntoConstraints = false
+
     }
 
     override func didReceiveMemoryWarning() {
@@ -30,8 +35,45 @@ class ViewController: UIViewController {
         // Dispose of any resources that can be recreated.
     }
 
-    @IBAction func onFilter(_ sender: Any) {
+    @IBAction func onFilter(_ sender: UIButton) {
+        if(sender.isSelected) {
+            hideSecondaryMenu()
+            sender.isSelected = false
+        } else {
+            showSecondaryMenu()
+            sender.isSelected = true
+        }
+    }
+    
+    func showSecondaryMenu() {
         view.addSubview(secondaryMenu)
+        
+        let bottomConstraint = secondaryMenu.bottomAnchor.constraint(equalTo: bottomMenu.topAnchor)
+        let leftConstraint = secondaryMenu.leftAnchor.constraint(equalTo: view.leftAnchor)
+        let rightConstraint = secondaryMenu.rightAnchor.constraint(equalTo: view.rightAnchor)
+        
+        let heightConstraint = secondaryMenu.heightAnchor.constraint(equalToConstant: 44)
+        
+        NSLayoutConstraint.activate([bottomConstraint, leftConstraint, rightConstraint, heightConstraint])
+        
+        view.layoutIfNeeded()
+        
+        self.secondaryMenu.alpha = 0
+
+        UIView.animate(withDuration: 0.4) {
+            self.secondaryMenu.alpha = 1.0
+        }
+        
+    }
+    
+    func hideSecondaryMenu() {
+        UIView.animate(withDuration: 0.4, animations: {
+            self.secondaryMenu.alpha = 0
+        }, completion: { completed in
+            if completed == true {
+                self.secondaryMenu.removeFromSuperview()
+            }
+        })
     }
 
 }

From 91521bbe655de2088ff2df668e024f7d7f13a0f4 Mon Sep 17 00:00:00 2001
From: Jackson Isaac <jacksonisaac2008@gmail.com>
Date: Tue, 8 Nov 2016 13:17:34 +0530
Subject: [PATCH 11/18] Create TableViewController Class. Attach Table view to
 the new TableViewController Class.

---
 ImageFilter.xcodeproj/project.pbxproj  |  4 +++
 ImageFilter/Base.lproj/Main.storyboard | 34 +++++++++++++++++++++++
 ImageFilter/TableViewController.swift  | 37 ++++++++++++++++++++++++++
 3 files changed, 75 insertions(+)
 create mode 100644 ImageFilter/TableViewController.swift

diff --git a/ImageFilter.xcodeproj/project.pbxproj b/ImageFilter.xcodeproj/project.pbxproj
index 34cc386..731a6fd 100644
--- a/ImageFilter.xcodeproj/project.pbxproj
+++ b/ImageFilter.xcodeproj/project.pbxproj
@@ -7,6 +7,7 @@
 	objects = {
 
 /* Begin PBXBuildFile section */
+		2987212E1DD1B8F600F378D7 /* TableViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2987212D1DD1B8F600F378D7 /* TableViewController.swift */; };
 		2987A54F1DCD1BAE001FDF06 /* AppDelegate.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2987A54E1DCD1BAE001FDF06 /* AppDelegate.swift */; };
 		2987A5511DCD1BAE001FDF06 /* ViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2987A5501DCD1BAE001FDF06 /* ViewController.swift */; };
 		2987A5541DCD1BAE001FDF06 /* Main.storyboard in Resources */ = {isa = PBXBuildFile; fileRef = 2987A5521DCD1BAE001FDF06 /* Main.storyboard */; };
@@ -17,6 +18,7 @@
 /* End PBXBuildFile section */
 
 /* Begin PBXFileReference section */
+		2987212D1DD1B8F600F378D7 /* TableViewController.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = TableViewController.swift; sourceTree = "<group>"; };
 		2987A54B1DCD1BAE001FDF06 /* ImageFilter.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = ImageFilter.app; sourceTree = BUILT_PRODUCTS_DIR; };
 		2987A54E1DCD1BAE001FDF06 /* AppDelegate.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = AppDelegate.swift; sourceTree = "<group>"; };
 		2987A5501DCD1BAE001FDF06 /* ViewController.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ViewController.swift; sourceTree = "<group>"; };
@@ -66,6 +68,7 @@
 				2987A5571DCD1BAE001FDF06 /* LaunchScreen.storyboard */,
 				2987A55A1DCD1BAE001FDF06 /* Info.plist */,
 				2987A5621DCDE4C8001FDF06 /* ImageProcessor.swift */,
+				2987212D1DD1B8F600F378D7 /* TableViewController.swift */,
 			);
 			path = ImageFilter;
 			sourceTree = "<group>";
@@ -146,6 +149,7 @@
 				2987A5511DCD1BAE001FDF06 /* ViewController.swift in Sources */,
 				2987A5611DCDAF85001FDF06 /* RGBAImage.swift in Sources */,
 				2987A5631DCDE4C8001FDF06 /* ImageProcessor.swift in Sources */,
+				2987212E1DD1B8F600F378D7 /* TableViewController.swift in Sources */,
 				2987A54F1DCD1BAE001FDF06 /* AppDelegate.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
diff --git a/ImageFilter/Base.lproj/Main.storyboard b/ImageFilter/Base.lproj/Main.storyboard
index bc788ba..d3f9923 100644
--- a/ImageFilter/Base.lproj/Main.storyboard
+++ b/ImageFilter/Base.lproj/Main.storyboard
@@ -5,6 +5,7 @@
     </device>
     <dependencies>
         <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="11524"/>
+        <capability name="Constraints to layout margins" minToolsVersion="6.0"/>
         <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
     </dependencies>
     <scenes>
@@ -138,6 +139,39 @@
             </objects>
             <point key="canvasLocation" x="216.80000000000001" y="-4.0479760119940034"/>
         </scene>
+        <!--Table View Controller-->
+        <scene sceneID="4hH-Vu-WLV">
+            <objects>
+                <viewController id="oWm-el-lXi" customClass="TableViewController" customModule="ImageFilter" customModuleProvider="target" sceneMemberID="viewController">
+                    <layoutGuides>
+                        <viewControllerLayoutGuide type="top" id="laa-Dj-eau"/>
+                        <viewControllerLayoutGuide type="bottom" id="bE8-31-vOJ"/>
+                    </layoutGuides>
+                    <view key="view" contentMode="scaleToFill" id="QSW-er-55g">
+                        <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <subviews>
+                            <tableView clipsSubviews="YES" contentMode="scaleToFill" alwaysBounceVertical="YES" dataMode="prototypes" style="plain" separatorStyle="default" rowHeight="44" sectionHeaderHeight="28" sectionFooterHeight="28" translatesAutoresizingMaskIntoConstraints="NO" id="smP-pT-ucl">
+                                <rect key="frame" x="16" y="20" width="343" height="647"/>
+                                <color key="backgroundColor" white="1" alpha="1" colorSpace="calibratedWhite"/>
+                            </tableView>
+                        </subviews>
+                        <color key="backgroundColor" white="1" alpha="1" colorSpace="calibratedWhite"/>
+                        <constraints>
+                            <constraint firstItem="smP-pT-ucl" firstAttribute="top" secondItem="laa-Dj-eau" secondAttribute="bottom" id="8aG-sw-S0z"/>
+                            <constraint firstAttribute="trailingMargin" secondItem="smP-pT-ucl" secondAttribute="trailing" id="IXp-Oy-KCr"/>
+                            <constraint firstItem="bE8-31-vOJ" firstAttribute="top" secondItem="smP-pT-ucl" secondAttribute="bottom" id="POf-gb-rYX"/>
+                            <constraint firstItem="smP-pT-ucl" firstAttribute="leading" secondItem="QSW-er-55g" secondAttribute="leadingMargin" id="bTX-OO-V7g"/>
+                        </constraints>
+                    </view>
+                    <connections>
+                        <outlet property="tableView" destination="smP-pT-ucl" id="goa-3r-oaR"/>
+                    </connections>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="ejH-bs-2vE" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="860" y="-3"/>
+        </scene>
     </scenes>
     <resources>
         <image name="sample" width="75" height="75"/>
diff --git a/ImageFilter/TableViewController.swift b/ImageFilter/TableViewController.swift
new file mode 100644
index 0000000..539f0d4
--- /dev/null
+++ b/ImageFilter/TableViewController.swift
@@ -0,0 +1,37 @@
+//
+//  TableViewController.swift
+//  ImageFilter
+//
+//  Created by Jackson Isaac on 08/11/16.
+//  Copyright © 2016 Jackson Isaac. All rights reserved.
+//
+
+import UIKit
+
+class TableViewController: UIViewController {
+
+    @IBOutlet var tableView: UITableView!
+    
+    override func viewDidLoad() {
+        super.viewDidLoad()
+
+        // Do any additional setup after loading the view.
+    }
+
+    override func didReceiveMemoryWarning() {
+        super.didReceiveMemoryWarning()
+        // Dispose of any resources that can be recreated.
+    }
+    
+
+    /*
+    // MARK: - Navigation
+
+    // In a storyboard-based application, you will often want to do a little preparation before navigation
+    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
+        // Get the new view controller using segue.destinationViewController.
+        // Pass the selected object to the new view controller.
+    }
+    */
+
+}

From 3ee68bbebb1250ad43100acce7dcc9bcf2625062 Mon Sep 17 00:00:00 2001
From: Jackson Isaac <jacksonisaac2008@gmail.com>
Date: Tue, 8 Nov 2016 16:07:28 +0530
Subject: [PATCH 12/18] Add support for importing images from Camera or Photo
 Library.

---
 ImageFilter/Base.lproj/Main.storyboard | 28 ++++++++++++++-
 ImageFilter/Info.plist                 |  4 +++
 ImageFilter/TableViewController.swift  | 46 +++++++++++++++++--------
 ImageFilter/ViewController.swift       | 47 +++++++++++++++++++++++++-
 4 files changed, 108 insertions(+), 17 deletions(-)

diff --git a/ImageFilter/Base.lproj/Main.storyboard b/ImageFilter/Base.lproj/Main.storyboard
index d3f9923..30cd537 100644
--- a/ImageFilter/Base.lproj/Main.storyboard
+++ b/ImageFilter/Base.lproj/Main.storyboard
@@ -41,6 +41,9 @@
                                                         </constraints>
                                                         <state key="normal" title="New Photo"/>
                                                         <state key="selected" title="Show Before Image"/>
+                                                        <connections>
+                                                            <action selector="onNewPhoto:" destination="BYZ-38-t0r" eventType="touchUpInside" id="6qJ-GN-s0H"/>
+                                                        </connections>
                                                     </button>
                                                     <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="nja-km-Ll8">
                                                         <rect key="frame" x="94" y="0.0" width="93.5" height="44"/>
@@ -94,6 +97,7 @@
                         <outlet property="bottomMenu" destination="pnf-Z3-dkZ" id="JcW-ZN-8lB"/>
                         <outlet property="filterButton" destination="nja-km-Ll8" id="NTh-z9-BGC"/>
                         <outlet property="imageView" destination="jvM-47-h1h" id="kUf-7f-KsO"/>
+                        <outlet property="newPhoto" destination="lFs-ZZ-m4V" id="bOo-F1-zsW"/>
                         <outlet property="secondaryMenu" destination="qsX-8E-MwU" id="iEw-yJ-4pA"/>
                     </connections>
                 </viewController>
@@ -154,6 +158,28 @@
                             <tableView clipsSubviews="YES" contentMode="scaleToFill" alwaysBounceVertical="YES" dataMode="prototypes" style="plain" separatorStyle="default" rowHeight="44" sectionHeaderHeight="28" sectionFooterHeight="28" translatesAutoresizingMaskIntoConstraints="NO" id="smP-pT-ucl">
                                 <rect key="frame" x="16" y="20" width="343" height="647"/>
                                 <color key="backgroundColor" white="1" alpha="1" colorSpace="calibratedWhite"/>
+                                <prototypes>
+                                    <tableViewCell clipsSubviews="YES" contentMode="scaleToFill" selectionStyle="blue" hidesAccessoryWhenEditing="NO" indentationLevel="1" indentationWidth="0.0" reuseIdentifier="FilterCell" textLabel="fZ0-vA-mfP" style="IBUITableViewCellStyleDefault" id="p0h-ZV-Fp3">
+                                        <rect key="frame" x="0.0" y="28" width="343" height="44"/>
+                                        <autoresizingMask key="autoresizingMask"/>
+                                        <tableViewCellContentView key="contentView" opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" tableViewCell="p0h-ZV-Fp3" id="fK3-OS-Z2E">
+                                            <rect key="frame" x="0.0" y="0.0" width="343" height="43"/>
+                                            <autoresizingMask key="autoresizingMask"/>
+                                            <subviews>
+                                                <label opaque="NO" multipleTouchEnabled="YES" contentMode="left" text="Filter Name" textAlignment="natural" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" id="fZ0-vA-mfP">
+                                                    <rect key="frame" x="15" y="0.0" width="313" height="43"/>
+                                                    <autoresizingMask key="autoresizingMask"/>
+                                                    <fontDescription key="fontDescription" type="system" pointSize="17"/>
+                                                    <nil key="textColor"/>
+                                                    <nil key="highlightedColor"/>
+                                                </label>
+                                            </subviews>
+                                        </tableViewCellContentView>
+                                    </tableViewCell>
+                                </prototypes>
+                                <connections>
+                                    <outlet property="dataSource" destination="oWm-el-lXi" id="qxr-eW-AmP"/>
+                                </connections>
                             </tableView>
                         </subviews>
                         <color key="backgroundColor" white="1" alpha="1" colorSpace="calibratedWhite"/>
@@ -170,7 +196,7 @@
                 </viewController>
                 <placeholder placeholderIdentifier="IBFirstResponder" id="ejH-bs-2vE" userLabel="First Responder" sceneMemberID="firstResponder"/>
             </objects>
-            <point key="canvasLocation" x="860" y="-3"/>
+            <point key="canvasLocation" x="1140" y="-15"/>
         </scene>
     </scenes>
     <resources>
diff --git a/ImageFilter/Info.plist b/ImageFilter/Info.plist
index 40c6215..b800d6d 100644
--- a/ImageFilter/Info.plist
+++ b/ImageFilter/Info.plist
@@ -2,6 +2,10 @@
 <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 <plist version="1.0">
 <dict>
+	<key>NSPhotoLibraryUsageDescription</key>
+	<string>Used to import images using Photo Library.</string>
+	<key>NSCameraUsageDescription</key>
+	<string>Used to import images using Camera.</string>
 	<key>CFBundleDevelopmentRegion</key>
 	<string>en</string>
 	<key>CFBundleExecutable</key>
diff --git a/ImageFilter/TableViewController.swift b/ImageFilter/TableViewController.swift
index 539f0d4..565d73d 100644
--- a/ImageFilter/TableViewController.swift
+++ b/ImageFilter/TableViewController.swift
@@ -8,30 +8,46 @@
 
 import UIKit
 
-class TableViewController: UIViewController {
+class TableViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
 
+    /*
+     * Table View is not set in the beginning as the content may change.
+     * Its data need to be able to reload and seperate from its presentation.
+     * Delegate: Delegate actions to the table. (handle actions and UI controls)
+     * Data Source: Delegate control of the data to the table. (provide data)
+     * Protocols are added for Delegate
+     */
     @IBOutlet var tableView: UITableView!
     
+    let filters = [
+        "Red",
+        "Blue",
+        "Green",
+        "Yellow",
+        "Purple",
+    ]
+    
     override func viewDidLoad() {
         super.viewDidLoad()
 
         // Do any additional setup after loading the view.
+        tableView.dataSource = self
+        tableView.delegate = self
     }
-
-    override func didReceiveMemoryWarning() {
-        super.didReceiveMemoryWarning()
-        // Dispose of any resources that can be recreated.
+    
+    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
+        print(filters[indexPath.row])
     }
     
-
-    /*
-    // MARK: - Navigation
-
-    // In a storyboard-based application, you will often want to do a little preparation before navigation
-    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
-        // Get the new view controller using segue.destinationViewController.
-        // Pass the selected object to the new view controller.
+    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
+        return filters.count
+    }
+    
+    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
+        let cell = tableView.dequeueReusableCell(withIdentifier: "FilterCell", for: indexPath)
+        
+        cell.textLabel?.text = filters[indexPath.row]
+        
+        return cell
     }
-    */
-
 }
diff --git a/ImageFilter/ViewController.swift b/ImageFilter/ViewController.swift
index 6c053f7..9219066 100644
--- a/ImageFilter/ViewController.swift
+++ b/ImageFilter/ViewController.swift
@@ -8,7 +8,7 @@
 
 import UIKit
 
-class ViewController: UIViewController {
+class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
     
     var filteredImage: UIImage?
     
@@ -20,6 +20,8 @@ class ViewController: UIViewController {
     
     @IBOutlet var filterButton: UIButton!
     
+    @IBOutlet var newPhoto: UIButton!
+    
     override func viewDidLoad() {
         super.viewDidLoad()
         // Do any additional setup after loading the view, typically from a nib.
@@ -34,7 +36,50 @@ class ViewController: UIViewController {
         super.didReceiveMemoryWarning()
         // Dispose of any resources that can be recreated.
     }
+    
+    @IBAction func onNewPhoto(_ sender: Any) {
+        let actionSheet = UIAlertController(title: "New Photo", message: nil, preferredStyle: .actionSheet)
+        actionSheet.addAction(UIAlertAction(title: "Camera", style: .default, handler: { action in
+            self.showCamera()
+        }))
+        
+        actionSheet.addAction(UIAlertAction(title: "Album", style: .default, handler: { action
+            in
+            self.showAlbum()
+        }))
+        
+        actionSheet.addAction(UIAlertAction(title: "Cancel", style: .cancel, handler: nil))
+        
+        self.present(actionSheet, animated: true, completion: nil)
+    }
+    
+    func showCamera() {
+        let cameraPicker = UIImagePickerController()
+        cameraPicker.delegate = self
+        cameraPicker.sourceType = .camera
+        
+        present(cameraPicker, animated: true, completion: nil)
+    }
+    
+    func showAlbum() {
+        let cameraPicker = UIImagePickerController()
+        cameraPicker.delegate = self
+        cameraPicker.sourceType = .photoLibrary
+        
+        present(cameraPicker, animated: true, completion: nil)
+    }
 
+    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
+        dismiss(animated: true, completion: nil)
+        if let image = info[UIImagePickerControllerOriginalImage] as? UIImage{
+            imageView.image = image
+        }
+    }
+    
+    func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
+        dismiss(animated: true, completion: nil)
+    }
+    
     @IBAction func onFilter(_ sender: UIButton) {
         if(sender.isSelected) {
             hideSecondaryMenu()

From a5df1ed96271da32689ad86c6d2e9310c9edad62 Mon Sep 17 00:00:00 2001
From: Jackson Isaac <jacksonisaac2008@gmail.com>
Date: Wed, 9 Nov 2016 12:44:17 +0530
Subject: [PATCH 13/18] Add support to Share the current image.

---
 ImageFilter/Base.lproj/Main.storyboard |  4 +++-
 ImageFilter/ViewController.swift       | 10 +++++++---
 2 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/ImageFilter/Base.lproj/Main.storyboard b/ImageFilter/Base.lproj/Main.storyboard
index 30cd537..210d750 100644
--- a/ImageFilter/Base.lproj/Main.storyboard
+++ b/ImageFilter/Base.lproj/Main.storyboard
@@ -70,6 +70,9 @@
                                                         </constraints>
                                                         <state key="normal" title="Share"/>
                                                         <state key="selected" title="Show Before Image"/>
+                                                        <connections>
+                                                            <action selector="onShare:" destination="BYZ-38-t0r" eventType="touchUpInside" id="EzE-To-j8A"/>
+                                                        </connections>
                                                     </button>
                                                 </subviews>
                                             </stackView>
@@ -97,7 +100,6 @@
                         <outlet property="bottomMenu" destination="pnf-Z3-dkZ" id="JcW-ZN-8lB"/>
                         <outlet property="filterButton" destination="nja-km-Ll8" id="NTh-z9-BGC"/>
                         <outlet property="imageView" destination="jvM-47-h1h" id="kUf-7f-KsO"/>
-                        <outlet property="newPhoto" destination="lFs-ZZ-m4V" id="bOo-F1-zsW"/>
                         <outlet property="secondaryMenu" destination="qsX-8E-MwU" id="iEw-yJ-4pA"/>
                     </connections>
                 </viewController>
diff --git a/ImageFilter/ViewController.swift b/ImageFilter/ViewController.swift
index 9219066..597d318 100644
--- a/ImageFilter/ViewController.swift
+++ b/ImageFilter/ViewController.swift
@@ -19,9 +19,7 @@ class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavig
     @IBOutlet var bottomMenu: UIView!
     
     @IBOutlet var filterButton: UIButton!
-    
-    @IBOutlet var newPhoto: UIButton!
-    
+        
     override func viewDidLoad() {
         super.viewDidLoad()
         // Do any additional setup after loading the view, typically from a nib.
@@ -37,6 +35,12 @@ class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavig
         // Dispose of any resources that can be recreated.
     }
     
+    @IBAction func onShare(_ sender: Any) {
+        let activityController = UIActivityViewController(activityItems: [imageView.image!], applicationActivities: nil)
+        present(activityController, animated: true, completion: nil)
+        
+    }
+    
     @IBAction func onNewPhoto(_ sender: Any) {
         let actionSheet = UIAlertController(title: "New Photo", message: nil, preferredStyle: .actionSheet)
         actionSheet.addAction(UIAlertAction(title: "Camera", style: .default, handler: { action in

From 323dccd51e7bc1e2d27d86b02428307b9513a235 Mon Sep 17 00:00:00 2001
From: Jackson Isaac <jacksonisaac2008@gmail.com>
Date: Wed, 9 Nov 2016 14:03:23 +0530
Subject: [PATCH 14/18] Remove redundant applyFilter function and add default
 parameter with value to val: Int

---
 ImageFilter/ImageProcessor.swift | 44 ++------------------------------
 1 file changed, 2 insertions(+), 42 deletions(-)

diff --git a/ImageFilter/ImageProcessor.swift b/ImageFilter/ImageProcessor.swift
index 5451316..70153f0 100644
--- a/ImageFilter/ImageProcessor.swift
+++ b/ImageFilter/ImageProcessor.swift
@@ -37,8 +37,8 @@ class ImageProcessor {
         }
     }
     
-    // Apply default filter to the image and return the RGBAImage.
-    func applyFilter(_ filter: String) -> RGBAImage {
+    // Apply filter with custom intensity to the image and return the RGBAImage.
+    func applyFilter(_ filter: String, val: Int = 255) -> RGBAImage {
         var newImage = self.imageRGBA!
         // Loop through each pixel of the image
         for y in 0..<newImage.height{
@@ -55,46 +55,6 @@ class ImageProcessor {
                     pixel.blue = UInt8(max(0, min(255,UInt8(255-pixel.blue))))
                     newImage.pixels[index] = pixel
                 // Add red color filter to the whole image.
-                case "redFilter":
-                    pixel.red = UInt8(255)
-                    newImage.pixels[index] = pixel
-                    break
-                // Add green color filter to the whole image.
-                case "greenFilter":
-                    pixel.green = UInt8(255)
-                    newImage.pixels[index] = pixel
-                    break
-                // Add blue color filter to the whole image.
-                case "blueFilter":
-                    pixel.blue = UInt8(255)
-                    newImage.pixels[index] = pixel
-                    break
-                // Make the image either transparent (0) or opaque(255)
-                case "alphaFilter":
-                    pixel.alpha = UInt8(128)
-                    newImage.pixels[index] = pixel
-                    break
-                default:
-                    print("Nothing to do!")
-                    return newImage
-                }
-            }
-        }
-        return newImage
-    }
-    
-    // Apply filter with custom intensity to the image and return the RGBAImage.
-    func applyFilter(_ filter: String, val: Int) -> RGBAImage {
-        var newImage = self.imageRGBA!
-        // Loop through each pixel of the image
-        for y in 0..<newImage.height{
-            for x in 0..<newImage.width {
-                let index = y*newImage.width + x
-                var pixel = newImage.pixels[index]
-                
-                // Switch-case for different type of filters.
-                switch filter {
-                // Add red color filter to the whole image.
                 case "redFilter":
                     pixel.red = UInt8(max(0, min(255,val)))
                     newImage.pixels[index] = pixel

From d0c2786d908f101f6e5db16953cd1f83d1492661 Mon Sep 17 00:00:00 2001
From: Jackson Isaac <jacksonisaac2008@gmail.com>
Date: Wed, 9 Nov 2016 14:03:43 +0530
Subject: [PATCH 15/18] [WIP] Add actions to Filter Buttons

---
 ImageFilter/Base.lproj/Main.storyboard | 37 ++++++++++----
 ImageFilter/ViewController.swift       | 70 +++++++++++++++++++++++++-
 2 files changed, 95 insertions(+), 12 deletions(-)

diff --git a/ImageFilter/Base.lproj/Main.storyboard b/ImageFilter/Base.lproj/Main.storyboard
index 210d750..c4ecc80 100644
--- a/ImageFilter/Base.lproj/Main.storyboard
+++ b/ImageFilter/Base.lproj/Main.storyboard
@@ -105,31 +105,46 @@
                 </viewController>
                 <placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
                 <view contentMode="scaleToFill" id="qsX-8E-MwU">
-                    <rect key="frame" x="0.0" y="0.0" width="240" height="128"/>
+                    <rect key="frame" x="0.0" y="0.0" width="307" height="128"/>
                     <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
                     <subviews>
                         <stackView opaque="NO" contentMode="scaleToFill" distribution="fillEqually" translatesAutoresizingMaskIntoConstraints="NO" id="uVz-YS-v3x">
-                            <rect key="frame" x="0.0" y="0.0" width="240" height="128"/>
+                            <rect key="frame" x="0.0" y="0.0" width="307" height="128"/>
                             <subviews>
                                 <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="EZu-eH-VxY">
-                                    <rect key="frame" x="0.0" y="0.0" width="48" height="128"/>
+                                    <rect key="frame" x="0.0" y="0.0" width="61.5" height="128"/>
+                                    <state key="normal" title="Negative"/>
+                                    <connections>
+                                        <action selector="onNegativeFilter:" destination="BYZ-38-t0r" eventType="touchUpInside" id="3xN-0o-a3z"/>
+                                    </connections>
+                                </button>
+                                <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="oHl-o3-elH">
+                                    <rect key="frame" x="61.5" y="0.0" width="61.5" height="128"/>
                                     <state key="normal" title="Red"/>
+                                    <connections>
+                                        <action selector="onRedFilter:" destination="BYZ-38-t0r" eventType="touchUpInside" id="0ST-wc-kdP"/>
+                                    </connections>
                                 </button>
                                 <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="3OM-BX-YIl">
-                                    <rect key="frame" x="48" y="0.0" width="48" height="128"/>
+                                    <rect key="frame" x="123" y="0.0" width="61" height="128"/>
                                     <state key="normal" title="Blue"/>
+                                    <connections>
+                                        <action selector="onBlueFilter:" destination="BYZ-38-t0r" eventType="touchUpInside" id="F87-nJ-Kba"/>
+                                    </connections>
                                 </button>
                                 <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="Hjs-OE-0AZ">
-                                    <rect key="frame" x="96" y="0.0" width="48" height="128"/>
+                                    <rect key="frame" x="184" y="0.0" width="61.5" height="128"/>
                                     <state key="normal" title="Green"/>
+                                    <connections>
+                                        <action selector="onGreenFilter:" destination="BYZ-38-t0r" eventType="touchUpInside" id="HPM-pR-dhm"/>
+                                    </connections>
                                 </button>
                                 <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="71X-c0-do5">
-                                    <rect key="frame" x="144" y="0.0" width="48" height="128"/>
-                                    <state key="normal" title="Yellow"/>
-                                </button>
-                                <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="oHl-o3-elH">
-                                    <rect key="frame" x="192" y="0.0" width="48" height="128"/>
-                                    <state key="normal" title="Purple"/>
+                                    <rect key="frame" x="245.5" y="0.0" width="61.5" height="128"/>
+                                    <state key="normal" title="Alpha"/>
+                                    <connections>
+                                        <action selector="onAlphaFilter:" destination="BYZ-38-t0r" eventType="touchUpInside" id="feG-aG-kEM"/>
+                                    </connections>
                                 </button>
                             </subviews>
                         </stackView>
diff --git a/ImageFilter/ViewController.swift b/ImageFilter/ViewController.swift
index 597d318..a726ef9 100644
--- a/ImageFilter/ViewController.swift
+++ b/ImageFilter/ViewController.swift
@@ -10,6 +10,7 @@ import UIKit
 
 class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
     
+    var image: UIImage?
     var filteredImage: UIImage?
     
     // Interface Builer Outlet
@@ -25,8 +26,9 @@ class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavig
         // Do any additional setup after loading the view, typically from a nib.
         
         secondaryMenu.backgroundColor = UIColor.white.withAlphaComponent(0.5)
-    
         secondaryMenu.translatesAutoresizingMaskIntoConstraints = false
+        
+        image = imageView.image
 
     }
 
@@ -35,6 +37,71 @@ class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavig
         // Dispose of any resources that can be recreated.
     }
     
+    @IBAction func onNegativeFilter(_ sender: UIButton) {
+        if(sender.isSelected) {
+            imageView.image = image
+            sender.isSelected = false
+        } else {
+            let imageProcessor = ImageProcessor(imageRGBA: RGBAImage(image: self.image!)!)
+            filteredImage = imageProcessor?.applyFilter("negative").toUIImage()
+            imageView.image = filteredImage
+
+            sender.isSelected = true
+        }
+    }
+    
+    @IBAction func onRedFilter(_ sender: UIButton) {
+        if(sender.isSelected) {
+            imageView.image = image
+            sender.isSelected = false
+        } else {
+            let imageProcessor = ImageProcessor(imageRGBA: RGBAImage(image: self.image!)!)
+            filteredImage = imageProcessor?.applyFilter("redFilter").toUIImage()
+            imageView.image = filteredImage
+            
+            sender.isSelected = true
+        }
+    }
+    
+    @IBAction func onBlueFilter(_ sender: UIButton) {
+        if(sender.isSelected) {
+            imageView.image = image
+            sender.isSelected = false
+        } else {
+            let imageProcessor = ImageProcessor(imageRGBA: RGBAImage(image: self.image!)!)
+            filteredImage = imageProcessor?.applyFilter("blueFilter").toUIImage()
+            imageView.image = filteredImage
+            
+            sender.isSelected = true
+        }
+    }
+    
+    @IBAction func onGreenFilter(_ sender: UIButton) {
+        if(sender.isSelected) {
+            imageView.image = image
+            sender.isSelected = false
+        } else {
+            let imageProcessor = ImageProcessor(imageRGBA: RGBAImage(image: self.image!)!)
+            filteredImage = imageProcessor?.applyFilter("greenFilter").toUIImage()
+            imageView.image = filteredImage
+            
+            sender.isSelected = true
+        }
+    }
+
+    @IBAction func onAlphaFilter(_ sender: UIButton) {
+        if(sender.isSelected) {
+            imageView.image = image
+            sender.isSelected = false
+        } else {
+            let imageProcessor = ImageProcessor(imageRGBA: RGBAImage(image: self.image!)!)
+            filteredImage = imageProcessor?.applyFilter("alphaFilter").toUIImage()
+            imageView.image = filteredImage
+            
+            sender.isSelected = true
+        }
+    }
+    
     @IBAction func onShare(_ sender: Any) {
         let activityController = UIActivityViewController(activityItems: [imageView.image!], applicationActivities: nil)
         present(activityController, animated: true, completion: nil)
@@ -77,6 +144,7 @@ class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavig
         dismiss(animated: true, completion: nil)
         if let image = info[UIImagePickerControllerOriginalImage] as? UIImage{
             imageView.image = image
+            self.image = image
         }
     }
     

From 179c7b7a1b5f8b51e734c33c5718528f86914a53 Mon Sep 17 00:00:00 2001
From: Jackson Isaac <jacksonisaac2008@gmail.com>
Date: Fri, 11 Nov 2016 15:51:22 +0530
Subject: [PATCH 16/18] Add Image Toggle on touch and overlay.

[WIP] Add Overlay saying original while showing the original image.
---
 ImageFilter/Base.lproj/Main.storyboard | 32 ++++++++++++++++++---
 ImageFilter/ViewController.swift       | 39 ++++++++++++++++++++++++--
 2 files changed, 65 insertions(+), 6 deletions(-)

diff --git a/ImageFilter/Base.lproj/Main.storyboard b/ImageFilter/Base.lproj/Main.storyboard
index c4ecc80..a2b3d3e 100644
--- a/ImageFilter/Base.lproj/Main.storyboard
+++ b/ImageFilter/Base.lproj/Main.storyboard
@@ -24,9 +24,10 @@
                             <stackView opaque="NO" contentMode="scaleToFill" axis="vertical" translatesAutoresizingMaskIntoConstraints="NO" id="pl3-jK-3lH">
                                 <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
                                 <subviews>
-                                    <imageView userInteractionEnabled="NO" contentMode="scaleAspectFit" horizontalHuggingPriority="251" verticalHuggingPriority="251" image="sample" translatesAutoresizingMaskIntoConstraints="NO" id="jvM-47-h1h">
+                                    <imageView contentMode="scaleAspectFit" horizontalHuggingPriority="251" verticalHuggingPriority="251" image="sample" translatesAutoresizingMaskIntoConstraints="NO" id="jvM-47-h1h">
                                         <rect key="frame" x="0.0" y="0.0" width="375" height="623"/>
                                         <color key="backgroundColor" red="0.0" green="0.0" blue="0.0" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+                                        <gestureRecognizers/>
                                     </imageView>
                                     <view contentMode="scaleToFill" translatesAutoresizingMaskIntoConstraints="NO" id="pnf-Z3-dkZ">
                                         <rect key="frame" x="0.0" y="623" width="375" height="44"/>
@@ -40,7 +41,6 @@
                                                             <constraint firstAttribute="height" constant="44" id="5ex-Ny-P4F"/>
                                                         </constraints>
                                                         <state key="normal" title="New Photo"/>
-                                                        <state key="selected" title="Show Before Image"/>
                                                         <connections>
                                                             <action selector="onNewPhoto:" destination="BYZ-38-t0r" eventType="touchUpInside" id="6qJ-GN-s0H"/>
                                                         </connections>
@@ -61,7 +61,9 @@
                                                             <constraint firstAttribute="height" constant="44" id="TUS-KC-l22"/>
                                                         </constraints>
                                                         <state key="normal" title="Compare"/>
-                                                        <state key="selected" title="Show Before Image"/>
+                                                        <connections>
+                                                            <action selector="onCompare:" destination="BYZ-38-t0r" eventType="touchUpInside" id="UMw-ia-0Fh"/>
+                                                        </connections>
                                                     </button>
                                                     <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="bdT-n9-wpu">
                                                         <rect key="frame" x="281.5" y="0.0" width="93.5" height="44"/>
@@ -69,7 +71,6 @@
                                                             <constraint firstAttribute="height" constant="44" id="Hfe-jo-DIR"/>
                                                         </constraints>
                                                         <state key="normal" title="Share"/>
-                                                        <state key="selected" title="Show Before Image"/>
                                                         <connections>
                                                             <action selector="onShare:" destination="BYZ-38-t0r" eventType="touchUpInside" id="EzE-To-j8A"/>
                                                         </connections>
@@ -100,6 +101,7 @@
                         <outlet property="bottomMenu" destination="pnf-Z3-dkZ" id="JcW-ZN-8lB"/>
                         <outlet property="filterButton" destination="nja-km-Ll8" id="NTh-z9-BGC"/>
                         <outlet property="imageView" destination="jvM-47-h1h" id="kUf-7f-KsO"/>
+                        <outlet property="originalOverlay" destination="hum-em-5Zh" id="dy9-he-Qhn"/>
                         <outlet property="secondaryMenu" destination="qsX-8E-MwU" id="iEw-yJ-4pA"/>
                     </connections>
                 </viewController>
@@ -157,6 +159,28 @@
                         <constraint firstItem="uVz-YS-v3x" firstAttribute="leading" secondItem="qsX-8E-MwU" secondAttribute="leading" id="uRE-aO-Gzf"/>
                     </constraints>
                 </view>
+                <view contentMode="scaleToFill" id="hum-em-5Zh" userLabel="Original Image overlay">
+                    <rect key="frame" x="0.0" y="0.0" width="240" height="128"/>
+                    <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
+                    <subviews>
+                        <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Original" textAlignment="center" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="z8r-vm-ktn">
+                            <rect key="frame" x="0.0" y="0.0" width="240" height="44"/>
+                            <constraints>
+                                <constraint firstAttribute="height" constant="44" id="Mh4-Dw-H4p"/>
+                            </constraints>
+                            <fontDescription key="fontDescription" type="system" pointSize="17"/>
+                            <nil key="textColor"/>
+                            <nil key="highlightedColor"/>
+                        </label>
+                    </subviews>
+                    <color key="backgroundColor" white="1" alpha="1" colorSpace="calibratedWhite"/>
+                    <constraints>
+                        <constraint firstAttribute="trailing" secondItem="z8r-vm-ktn" secondAttribute="trailing" id="GMC-qX-V9k"/>
+                        <constraint firstItem="z8r-vm-ktn" firstAttribute="top" secondItem="hum-em-5Zh" secondAttribute="top" id="Ht0-hN-Eq6"/>
+                        <constraint firstAttribute="bottom" secondItem="z8r-vm-ktn" secondAttribute="bottom" id="c9t-SI-KFb"/>
+                        <constraint firstItem="z8r-vm-ktn" firstAttribute="leading" secondItem="hum-em-5Zh" secondAttribute="leading" id="dMk-zq-hot"/>
+                    </constraints>
+                </view>
             </objects>
             <point key="canvasLocation" x="216.80000000000001" y="-4.0479760119940034"/>
         </scene>
diff --git a/ImageFilter/ViewController.swift b/ImageFilter/ViewController.swift
index a726ef9..dacf624 100644
--- a/ImageFilter/ViewController.swift
+++ b/ImageFilter/ViewController.swift
@@ -11,7 +11,11 @@ import UIKit
 class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
     
     var image: UIImage?
+    var interImage: UIImage?
     var filteredImage: UIImage?
+    var imageProcessor: ImageProcessor?
+    
+    @IBOutlet var originalOverlay: UIView!
     
     // Interface Builer Outlet
     @IBOutlet weak var imageView: UIImageView!
@@ -29,7 +33,7 @@ class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavig
         secondaryMenu.translatesAutoresizingMaskIntoConstraints = false
         
         image = imageView.image
-
+        
     }
 
     override func didReceiveMemoryWarning() {
@@ -37,12 +41,43 @@ class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavig
         // Dispose of any resources that can be recreated.
     }
     
+    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
+        view.addSubview(originalOverlay)
+        imageView.image = image
+//        print("Image Touched in touchesBegan")
+    }
+    
+    override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
+        self.originalOverlay.removeFromSuperview()
+        if (filteredImage != nil) {
+            imageView.image = filteredImage
+        }
+    }
+    
+    @IBAction func onCompare(_ sender: UIButton) {
+        if(sender.isSelected) {
+            if (filteredImage != nil) {
+                imageView.image = filteredImage
+            }
+            self.originalOverlay.removeFromSuperview()
+            sender.isSelected = false
+        } else {
+            view.addSubview(originalOverlay)
+            imageView.image = image
+            sender.isSelected = true
+        }
+    }
+    
     @IBAction func onNegativeFilter(_ sender: UIButton) {
         if(sender.isSelected) {
             imageView.image = image
             sender.isSelected = false
         } else {
-            let imageProcessor = ImageProcessor(imageRGBA: RGBAImage(image: self.image!)!)
+            if (filteredImage != nil) {
+                imageProcessor = ImageProcessor(imageRGBA: RGBAImage(image: self.filteredImage!)!)
+            } else {
+                imageProcessor = ImageProcessor(imageRGBA: RGBAImage(image: self.image!)!)
+            }
             filteredImage = imageProcessor?.applyFilter("negative").toUIImage()
             imageView.image = filteredImage
 

From bf20cc117a72c0c2b4a0ad592b0d6da8111b692f Mon Sep 17 00:00:00 2001
From: Jackson Isaac <jacksonisaac2008@gmail.com>
Date: Sat, 12 Nov 2016 15:19:29 +0530
Subject: [PATCH 17/18] [Done] Add overlay label showing "Original" when
 initial image is displayed.

Enable compare button only when a filter is applied.
---
 ImageFilter/Base.lproj/Main.storyboard |  8 +--
 ImageFilter/ViewController.swift       | 82 ++++++++++++++++++++------
 2 files changed, 67 insertions(+), 23 deletions(-)

diff --git a/ImageFilter/Base.lproj/Main.storyboard b/ImageFilter/Base.lproj/Main.storyboard
index a2b3d3e..892d1f0 100644
--- a/ImageFilter/Base.lproj/Main.storyboard
+++ b/ImageFilter/Base.lproj/Main.storyboard
@@ -99,6 +99,7 @@
                     </view>
                     <connections>
                         <outlet property="bottomMenu" destination="pnf-Z3-dkZ" id="JcW-ZN-8lB"/>
+                        <outlet property="compareButton" destination="0m3-SR-OMo" id="GBo-d6-O5I"/>
                         <outlet property="filterButton" destination="nja-km-Ll8" id="NTh-z9-BGC"/>
                         <outlet property="imageView" destination="jvM-47-h1h" id="kUf-7f-KsO"/>
                         <outlet property="originalOverlay" destination="hum-em-5Zh" id="dy9-he-Qhn"/>
@@ -175,10 +176,9 @@
                     </subviews>
                     <color key="backgroundColor" white="1" alpha="1" colorSpace="calibratedWhite"/>
                     <constraints>
-                        <constraint firstAttribute="trailing" secondItem="z8r-vm-ktn" secondAttribute="trailing" id="GMC-qX-V9k"/>
-                        <constraint firstItem="z8r-vm-ktn" firstAttribute="top" secondItem="hum-em-5Zh" secondAttribute="top" id="Ht0-hN-Eq6"/>
-                        <constraint firstAttribute="bottom" secondItem="z8r-vm-ktn" secondAttribute="bottom" id="c9t-SI-KFb"/>
-                        <constraint firstItem="z8r-vm-ktn" firstAttribute="leading" secondItem="hum-em-5Zh" secondAttribute="leading" id="dMk-zq-hot"/>
+                        <constraint firstAttribute="trailing" secondItem="z8r-vm-ktn" secondAttribute="trailing" id="8aF-2m-Nw3"/>
+                        <constraint firstItem="z8r-vm-ktn" firstAttribute="top" secondItem="hum-em-5Zh" secondAttribute="top" id="GmJ-bN-oAv"/>
+                        <constraint firstItem="z8r-vm-ktn" firstAttribute="leading" secondItem="hum-em-5Zh" secondAttribute="leading" id="b3X-BS-2RB"/>
                     </constraints>
                 </view>
             </objects>
diff --git a/ImageFilter/ViewController.swift b/ImageFilter/ViewController.swift
index dacf624..3ca8822 100644
--- a/ImageFilter/ViewController.swift
+++ b/ImageFilter/ViewController.swift
@@ -11,10 +11,11 @@ import UIKit
 class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
     
     var image: UIImage?
-    var interImage: UIImage?
     var filteredImage: UIImage?
     var imageProcessor: ImageProcessor?
     
+    @IBOutlet var compareButton: UIButton!
+    
     @IBOutlet var originalOverlay: UIView!
     
     // Interface Builer Outlet
@@ -31,9 +32,11 @@ class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavig
         
         secondaryMenu.backgroundColor = UIColor.white.withAlphaComponent(0.5)
         secondaryMenu.translatesAutoresizingMaskIntoConstraints = false
+        originalOverlay.translatesAutoresizingMaskIntoConstraints = false
         
         image = imageView.image
-        
+//        filteredImage = image
+        compareButton.isEnabled = false
     }
 
     override func didReceiveMemoryWarning() {
@@ -42,33 +45,25 @@ class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavig
     }
     
     override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
-        view.addSubview(originalOverlay)
-        imageView.image = image
-//        print("Image Touched in touchesBegan")
+        showOverlayOriginalImage()
     }
     
     override func touchesEnded(_ touches: Set<UITouch>, with event: UIEvent?) {
-        self.originalOverlay.removeFromSuperview()
-        if (filteredImage != nil) {
-            imageView.image = filteredImage
-        }
+        hideOverlayOriginalImage()
     }
     
     @IBAction func onCompare(_ sender: UIButton) {
         if(sender.isSelected) {
-            if (filteredImage != nil) {
-                imageView.image = filteredImage
-            }
-            self.originalOverlay.removeFromSuperview()
+            hideOverlayOriginalImage()
             sender.isSelected = false
         } else {
-            view.addSubview(originalOverlay)
-            imageView.image = image
+            showOverlayOriginalImage()
             sender.isSelected = true
         }
     }
     
     @IBAction func onNegativeFilter(_ sender: UIButton) {
+        enableCompareButton()
         if(sender.isSelected) {
             imageView.image = image
             sender.isSelected = false
@@ -86,11 +81,16 @@ class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavig
     }
     
     @IBAction func onRedFilter(_ sender: UIButton) {
+        enableCompareButton()
         if(sender.isSelected) {
             imageView.image = image
             sender.isSelected = false
         } else {
-            let imageProcessor = ImageProcessor(imageRGBA: RGBAImage(image: self.image!)!)
+            if (filteredImage != nil) {
+                imageProcessor = ImageProcessor(imageRGBA: RGBAImage(image: self.filteredImage!)!)
+            } else {
+                imageProcessor = ImageProcessor(imageRGBA: RGBAImage(image: self.image!)!)
+            }
             filteredImage = imageProcessor?.applyFilter("redFilter").toUIImage()
             imageView.image = filteredImage
             
@@ -99,11 +99,16 @@ class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavig
     }
     
     @IBAction func onBlueFilter(_ sender: UIButton) {
+        enableCompareButton()
         if(sender.isSelected) {
             imageView.image = image
             sender.isSelected = false
         } else {
-            let imageProcessor = ImageProcessor(imageRGBA: RGBAImage(image: self.image!)!)
+            if (filteredImage != nil) {
+                imageProcessor = ImageProcessor(imageRGBA: RGBAImage(image: self.filteredImage!)!)
+            } else {
+                imageProcessor = ImageProcessor(imageRGBA: RGBAImage(image: self.image!)!)
+            }
             filteredImage = imageProcessor?.applyFilter("blueFilter").toUIImage()
             imageView.image = filteredImage
             
@@ -112,11 +117,16 @@ class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavig
     }
     
     @IBAction func onGreenFilter(_ sender: UIButton) {
+        enableCompareButton()
         if(sender.isSelected) {
             imageView.image = image
             sender.isSelected = false
         } else {
-            let imageProcessor = ImageProcessor(imageRGBA: RGBAImage(image: self.image!)!)
+            if (filteredImage != nil) {
+                imageProcessor = ImageProcessor(imageRGBA: RGBAImage(image: self.filteredImage!)!)
+            } else {
+                imageProcessor = ImageProcessor(imageRGBA: RGBAImage(image: self.image!)!)
+            }
             filteredImage = imageProcessor?.applyFilter("greenFilter").toUIImage()
             imageView.image = filteredImage
             
@@ -125,11 +135,16 @@ class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavig
     }
 
     @IBAction func onAlphaFilter(_ sender: UIButton) {
+        enableCompareButton()
         if(sender.isSelected) {
             imageView.image = image
             sender.isSelected = false
         } else {
-            let imageProcessor = ImageProcessor(imageRGBA: RGBAImage(image: self.image!)!)
+            if (filteredImage != nil) {
+                imageProcessor = ImageProcessor(imageRGBA: RGBAImage(image: self.filteredImage!)!)
+            } else {
+                imageProcessor = ImageProcessor(imageRGBA: RGBAImage(image: self.image!)!)
+            }
             filteredImage = imageProcessor?.applyFilter("alphaFilter").toUIImage()
             imageView.image = filteredImage
             
@@ -159,6 +174,12 @@ class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavig
         self.present(actionSheet, animated: true, completion: nil)
     }
     
+    func enableCompareButton() {
+        if compareButton.isEnabled == false {
+            compareButton.isEnabled = true
+        }
+    }
+    
     func showCamera() {
         let cameraPicker = UIImagePickerController()
         cameraPicker.delegate = self
@@ -227,6 +248,29 @@ class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavig
             }
         })
     }
+    
+    func showOverlayOriginalImage() {
+        view.addSubview(originalOverlay)
+        
+        let topConstraint = originalOverlay.topAnchor.constraint(equalTo: view.topAnchor)
+        let leftConstraint = originalOverlay.leftAnchor.constraint(equalTo: view.leftAnchor)
+        let rightConstraint = originalOverlay.rightAnchor.constraint(equalTo: view.rightAnchor)
+
+        let heightConstraint = originalOverlay.heightAnchor.constraint(equalToConstant: 44)
+
+        NSLayoutConstraint.activate([topConstraint, leftConstraint, rightConstraint, heightConstraint])
+
+        view.layoutIfNeeded()
+        
+        imageView.image = image
+    }
+    
+    func hideOverlayOriginalImage() {
+        self.originalOverlay.removeFromSuperview()
+        if (filteredImage != nil) {
+            imageView.image = filteredImage
+        }
+    }
 
 }
 

From 5c14bc5f3f42cd3e3f596d69c5f108fa32a270d6 Mon Sep 17 00:00:00 2001
From: Jackson Isaac <jacksonisaac2008@gmail.com>
Date: Sat, 12 Nov 2016 15:36:47 +0530
Subject: [PATCH 18/18] Add second UIImageView. Cross fade images.

---
 ImageFilter/Base.lproj/Main.storyboard |  7 +++++
 ImageFilter/ViewController.swift       | 42 ++++++++++++++++++++------
 2 files changed, 40 insertions(+), 9 deletions(-)

diff --git a/ImageFilter/Base.lproj/Main.storyboard b/ImageFilter/Base.lproj/Main.storyboard
index 892d1f0..cbc1c0e 100644
--- a/ImageFilter/Base.lproj/Main.storyboard
+++ b/ImageFilter/Base.lproj/Main.storyboard
@@ -21,6 +21,12 @@
                         <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
                         <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                         <subviews>
+                            <imageView contentMode="scaleAspectFit" horizontalHuggingPriority="251" verticalHuggingPriority="251" fixedFrame="YES" image="sample" translatesAutoresizingMaskIntoConstraints="NO" id="fvR-d2-Fs6">
+                                <rect key="frame" x="0.0" y="22" width="375" height="623"/>
+                                <autoresizingMask key="autoresizingMask" flexibleMaxX="YES" flexibleMaxY="YES"/>
+                                <color key="backgroundColor" red="0.0" green="0.0" blue="0.0" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+                                <gestureRecognizers/>
+                            </imageView>
                             <stackView opaque="NO" contentMode="scaleToFill" axis="vertical" translatesAutoresizingMaskIntoConstraints="NO" id="pl3-jK-3lH">
                                 <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
                                 <subviews>
@@ -101,6 +107,7 @@
                         <outlet property="bottomMenu" destination="pnf-Z3-dkZ" id="JcW-ZN-8lB"/>
                         <outlet property="compareButton" destination="0m3-SR-OMo" id="GBo-d6-O5I"/>
                         <outlet property="filterButton" destination="nja-km-Ll8" id="NTh-z9-BGC"/>
+                        <outlet property="filteredImageView" destination="fvR-d2-Fs6" id="O7s-79-bfN"/>
                         <outlet property="imageView" destination="jvM-47-h1h" id="kUf-7f-KsO"/>
                         <outlet property="originalOverlay" destination="hum-em-5Zh" id="dy9-he-Qhn"/>
                         <outlet property="secondaryMenu" destination="qsX-8E-MwU" id="iEw-yJ-4pA"/>
diff --git a/ImageFilter/ViewController.swift b/ImageFilter/ViewController.swift
index 3ca8822..6ebc6e0 100644
--- a/ImageFilter/ViewController.swift
+++ b/ImageFilter/ViewController.swift
@@ -20,6 +20,7 @@ class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavig
     
     // Interface Builer Outlet
     @IBOutlet weak var imageView: UIImageView!
+    @IBOutlet var filteredImageView: UIImageView!
     
     @IBOutlet var secondaryMenu: UIView!
     @IBOutlet var bottomMenu: UIView!
@@ -35,7 +36,6 @@ class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavig
         originalOverlay.translatesAutoresizingMaskIntoConstraints = false
         
         image = imageView.image
-//        filteredImage = image
         compareButton.isEnabled = false
     }
 
@@ -74,8 +74,8 @@ class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavig
                 imageProcessor = ImageProcessor(imageRGBA: RGBAImage(image: self.image!)!)
             }
             filteredImage = imageProcessor?.applyFilter("negative").toUIImage()
-            imageView.image = filteredImage
-
+            showFilteredImage(filteredImage: filteredImage!)
+            
             sender.isSelected = true
         }
     }
@@ -92,7 +92,7 @@ class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavig
                 imageProcessor = ImageProcessor(imageRGBA: RGBAImage(image: self.image!)!)
             }
             filteredImage = imageProcessor?.applyFilter("redFilter").toUIImage()
-            imageView.image = filteredImage
+            showFilteredImage(filteredImage: filteredImage!)
             
             sender.isSelected = true
         }
@@ -110,7 +110,7 @@ class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavig
                 imageProcessor = ImageProcessor(imageRGBA: RGBAImage(image: self.image!)!)
             }
             filteredImage = imageProcessor?.applyFilter("blueFilter").toUIImage()
-            imageView.image = filteredImage
+            showFilteredImage(filteredImage: filteredImage!)
             
             sender.isSelected = true
         }
@@ -128,7 +128,7 @@ class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavig
                 imageProcessor = ImageProcessor(imageRGBA: RGBAImage(image: self.image!)!)
             }
             filteredImage = imageProcessor?.applyFilter("greenFilter").toUIImage()
-            imageView.image = filteredImage
+            showFilteredImage(filteredImage: filteredImage!)
             
             sender.isSelected = true
         }
@@ -146,7 +146,7 @@ class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavig
                 imageProcessor = ImageProcessor(imageRGBA: RGBAImage(image: self.image!)!)
             }
             filteredImage = imageProcessor?.applyFilter("alphaFilter").toUIImage()
-            imageView.image = filteredImage
+            showFilteredImage(filteredImage: filteredImage!)
             
             sender.isSelected = true
         }
@@ -174,6 +174,30 @@ class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavig
         self.present(actionSheet, animated: true, completion: nil)
     }
     
+    func showFilteredImage(filteredImage: UIImage) {
+        imageView.alpha = 1
+        filteredImageView.alpha = 0
+        
+        filteredImageView.image = filteredImage
+        
+        UIView.animate(withDuration: 0.4) {
+            self.filteredImageView.alpha = 1.0
+            self.imageView.alpha = 0
+        }
+    }
+    
+    func showOriginalImage() {
+        imageView.alpha = 0
+        filteredImageView.alpha = 1
+        
+        filteredImageView.image = filteredImage
+        
+        UIView.animate(withDuration: 0.4) {
+            self.filteredImageView.alpha = 0
+            self.imageView.alpha = 1
+        }
+    }
+    
     func enableCompareButton() {
         if compareButton.isEnabled == false {
             compareButton.isEnabled = true
@@ -262,13 +286,13 @@ class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavig
 
         view.layoutIfNeeded()
         
-        imageView.image = image
+        showOriginalImage()
     }
     
     func hideOverlayOriginalImage() {
         self.originalOverlay.removeFromSuperview()
         if (filteredImage != nil) {
-            imageView.image = filteredImage
+            showFilteredImage(filteredImage: filteredImage!)
         }
     }