merge extensions classes

Author: tocsoft

src/ImageSharp.Drawing/Processing/DrawingOptionsDefaultsExtensions.cs

@@ -1,6 +1,7 @@
 // Copyright (c) Six Labors.
 // Licensed under the Apache License, Version 2.0.
 
+using System.Numerics;
 using SixLabors.ImageSharp.Processing;
 
 namespace SixLabors.ImageSharp.Drawing.Processing
@@ -10,12 +11,70 @@ namespace SixLabors.ImageSharp.Drawing.Processing
     /// </summary>
     public static class DrawingOptionsDefaultsExtensions
     {
+        private const string DrawingTransformMatrixKey = "DrawingTransformMatrix3x2";
+
         /// <summary>
         /// Gets the default shape processing options against the image processing context.
         /// </summary>
         /// <param name="context">The image processing context to retrieve defaults from.</param>
-        /// <returns>The globaly configured default options.</returns>
+        /// <returns>The globally configured default options.</returns>
         public static DrawingOptions GetDrawingOptions(this IImageProcessingContext context)
             => new DrawingOptions(context.GetGraphicsOptions(), context.GetShapeOptions(), context.GetTextOptions(), context.GetDrawingTransform());
+
+        /// <summary>
+        /// Sets the 2D transformation matrix to be used during rasterization when drawing shapes or text.
+        /// </summary>
+        /// <param name="context">The image processing context to store default against.</param>
+        /// <param name="matrix">The matrix to use.</param>
+        /// <returns>The passed in <paramref name="context"/> to allow chaining.</returns>
+        public static IImageProcessingContext SetDrawingTransform(this IImageProcessingContext context, Matrix3x2 matrix)
+        {
+            context.Properties[DrawingTransformMatrixKey] = matrix;
+            return context;
+        }
+
+        /// <summary>
+        /// Sets the default 2D transformation matrix to be used during rasterization when drawing shapes or text.
+        /// </summary>
+        /// <param name="configuration">The configuration to store default against.</param>
+        /// <param name="matrix">The default matrix to use.</param>
+        public static void SetDrawingTransform(this Configuration configuration, Matrix3x2 matrix)
+        {
+            configuration.Properties[DrawingTransformMatrixKey] = matrix;
+        }
+
+        /// <summary>
+        /// Gets the default 2D transformation matrix to be used during rasterization when drawing shapes or text.
+        /// </summary>
+        /// <param name="context">The image processing context to retrieve defaults from.</param>
+        /// <returns>The matrix.</returns>
+        public static Matrix3x2 GetDrawingTransform(this IImageProcessingContext context)
+        {
+            if (context.Properties.TryGetValue(DrawingTransformMatrixKey, out var options) && options is Matrix3x2 go)
+            {
+                return go;
+            }
+
+            var matrix = context.Configuration.GetDrawingTransform();
+
+            // do not cache the fall back to config into the processing context
+            // in case someone want to change the value on the config and expects it re-flow thru.
+            return matrix;
+        }
+
+        /// <summary>
+        /// Gets the default 2D transformation matrix to be used during rasterization when drawing shapes or text.
+        /// </summary>
+        /// <param name="configuration">The configuration to retrieve defaults from.</param>
+        /// <returns>The globally configured default matrix.</returns>
+        public static Matrix3x2 GetDrawingTransform(this Configuration configuration)
+        {
+            if (configuration.Properties.TryGetValue(DrawingTransformMatrixKey, out var options) && options is Matrix3x2 go)
+            {
+                return go;
+            }
+
+            return Matrix3x2.Identity;
+        }
     }
 }