Gamma Init

app/WindowsDisplayAPI/DisplayGammaRamp.cs

@@ -0,0 +1,91 @@
+using System;
+using System.Diagnostics;
+using WindowsDisplayAPI.Native.DeviceContext.Structures;
+
+namespace WindowsDisplayAPI
+{
+    public class DisplayGammaRamp
+    {
+        public DisplayGammaRamp(ushort[] red, ushort[] green, ushort[] blue)
+        {
+            if (red?.Length != GammaRamp.DataPoints)
+            {
+                throw new ArgumentOutOfRangeException(nameof(red));
+            }
+
+            if (green?.Length != GammaRamp.DataPoints)
+            {
+                throw new ArgumentOutOfRangeException(nameof(green));
+            }
+
+            if (blue?.Length != GammaRamp.DataPoints)
+            {
+                throw new ArgumentOutOfRangeException(nameof(blue));
+            }
+
+            Red = red;
+            Green = green;
+            Blue = blue;
+        }
+
+        public DisplayGammaRamp(double brightness = 0.5, double contrast = 0.5, double gamma = 1)
+            : this(
+                CalculateLUT(brightness, contrast, gamma),
+                CalculateLUT(brightness, contrast, gamma),
+                CalculateLUT(brightness, contrast, gamma)
+            )
+        {
+        }
+
+        public DisplayGammaRamp(
+            double redBrightness,
+            double redContrast,
+            double redGamma,
+            double greenBrightness,
+            double greenContrast,
+            double greenGamma,
+            double blueBrightness,
+            double blueContrast,
+            double blueGamma
+        )
+            : this(
+                CalculateLUT(redBrightness, redContrast, redGamma),
+                CalculateLUT(greenBrightness, greenContrast, greenGamma),
+                CalculateLUT(blueBrightness, blueContrast, blueGamma)
+            )
+        {
+        }
+
+        internal DisplayGammaRamp(GammaRamp ramp) :
+            this(ramp.Red, ramp.Green, ramp.Blue)
+        {
+        }
+
+        public ushort[] Blue { get; }
+        public ushort[] Green { get; }
+        public ushort[] Red { get; }
+        private static ushort[] CalculateLUT(double brightness, double contrast, double gamma)
+        {
+
+            // Fill the gamma curve
+            var result = new ushort[GammaRamp.DataPoints];
+            string bits = "";
+
+            for (var i = 0; i < result.Length; i++)
+            {
+                result[i] = (ushort)((0.5 + brightness / 2)  * ushort.MaxValue * i / (float)(result.Length - 1));
+                bits += result[i].ToString() + " ";
+            }
+
+            Debug.WriteLine(bits);
+
+            return result;
+        }
+
+
+        internal GammaRamp AsRamp()
+        {
+            return new GammaRamp(Red, Green, Blue);
+        }
+    }
+}