josephjoeljo · November 1, 2019 19:35 · Nov 1, 2019 · Nov 1, 2019 · Nov 1, 2019 · Nov 1, 2019
diff --git a/blackandwhite b/blackandwhite
@@ -28,6 +28,7 @@ guard let monoFormat = vImage_CGImageFormat(
 }
 
 let result = try? destinationBuffer.createCGImage(format: monoFormat)
+
 if let result = result {
     imageView.image = UIImage(cgImage: result)
 }
diff --git a/Swift → blackandwhite b/Swift → blackandwhite
diff --git a/Swift b/Swift
@@ -1,3 +1,5 @@
+// vim: syntax=Swift
+
 Swift Color matrix
 
 let redCoefficient: Float = 0.2126

diff --git a/Swift b/Swift
@@ -1 +1,31 @@
-Swift Color matrix
+Swift Color matrix
+
+let redCoefficient: Float = 0.2126
+let greenCoefficient: Float = 0.7152
+let blueCoefficient: Float = 0.0722
+
+let divisor: Int32 = 0x1000
+let fDivisor = Float(divisor)
+
+var coefficientsMatrix = [
+    Int16(redCoefficient * fDivisor),
+    Int16(greenCoefficient * fDivisor),
+    Int16(blueCoefficient * fDivisor)
+]
+
+let preBias: [Int16] = [0, 0, 0, 0]
+let postBias: Int32 = 0
+
+guard let monoFormat = vImage_CGImageFormat(
+    bitsPerComponent: 8,
+    bitsPerPixel: 8,
+    colorSpace: CGColorSpaceCreateDeviceGray(),
+    bitmapInfo: CGBitmapInfo(rawValue: CGImageAlphaInfo.none.rawValue),
+    renderingIntent: .defaultIntent) else {
+        return
+}
+
+let result = try? destinationBuffer.createCGImage(format: monoFormat)
+if let result = result {
+    imageView.image = UIImage(cgImage: result)
+}
diff --git a/Swift b/Swift
@@ -0,0 +1 @@
+Swift Color matrix