AddUserSecrets, RenameByDateTaken and BlurHash

BlurHash.Core/MathUtils.cs

@@ -0,0 +1,38 @@
+namespace BlurHash;
+
+/// <summary>
+/// Utility methods for mathematical calculations
+/// </summary>
+public static class MathUtils
+{
+    /// <summary>
+    /// Calculates <c>Math.Pow(base, exponent)</c> but retains the sign of <c>base</c> in the result.
+    /// </summary>
+    /// <param name="base">The base of the power. The sign of this value will be the sign of the result</param>
+    /// <param name="exponent">The exponent of the power</param>
+    public static double SignPow(double @base, double exponent) => Math.Sign(@base) * Math.Pow(Math.Abs(@base), exponent);
+
+    /// <summary>
+    /// Converts an sRGB input value (0 to 255) into a linear double value
+    /// </summary>
+    public static double SRgbToLinear(int value)
+    {
+        double v = value / 255.0;
+        if (v <= 0.04045)
+            return v / 12.92;
+        else
+            return Math.Pow((v + 0.055) / 1.055, 2.4);
+    }
+
+    /// <summary>
+    /// Converts a linear double value into an sRGB input value (0 to 255)
+    /// </summary>
+    public static int LinearTosRgb(double value)
+    {
+        double v = Math.Max(0.0, Math.Min(1.0, value));
+        if (v <= 0.0031308)
+            return (int)(v * 12.92 * 255 + 0.5);
+        else
+            return (int)((1.055 * Math.Pow(v, 1 / 2.4) - 0.055) * 255 + 0.5);
+    }
+}