basic Color methods

src/ImageSharp/Color.cs

@@ -7,9 +7,9 @@ using SixLabors.ImageSharp.PixelFormats;
 
 namespace SixLabors.ImageSharp
 {
-    public struct Color
+    public readonly struct Color
     {
-        private Rgba64 data;
+        private readonly Rgba64 data;
 
         public Color(Rgba64 pixel)
         {
@@ -21,12 +21,55 @@ namespace SixLabors.ImageSharp
             this.data = new Rgba64(pixel);
         }
 
+        public Color(Argb32 pixel)
+        {
+            this.data = new Rgba64(pixel);
+        }
+
+        public Color(Bgra32 pixel)
+        {
+            this.data = new Rgba64(pixel);
+        }
+
+        public Color(Rgb24 pixel)
+        {
+            this.data = new Rgba64(pixel);
+        }
+
+        public Color(Bgr24 pixel)
+        {
+            this.data = new Rgba64(pixel);
+        }
+
         public Color(Vector4 vector)
         {
-            this.data = default;
-            this.data.FromVector4(vector);
+            this.data = new Rgba64(vector);
         }
 
+        public static implicit operator Color(Rgba64 source) => new Color(source);
+
+        public static implicit operator Color(Rgba32 source) => new Color(source);
+
+        public static implicit operator Color(Bgra32 source) => new Color(source);
+
+        public static implicit operator Color(Argb32 source) => new Color(source);
+
+        public static implicit operator Color(Rgb24 source) => new Color(source);
+
+        public static implicit operator Color(Bgr24 source) => new Color(source);
+
+        public static implicit operator Rgba64(Color color) => color.data;
+
+        public static implicit operator Rgba32(Color color) => color.data.ToRgba32();
+
+        public static implicit operator Bgra32(Color color) => color.data.ToBgra32();
+
+        public static implicit operator Argb32(Color color) => color.data.ToArgb32();
+
+        public static implicit operator Rgb24(Color color) => color.data.ToRgb24();
+
+        public static implicit operator Bgr24(Color color) => color.data.ToBgr24();
+
         public static Color FromRgba(byte r, byte g, byte b, byte a) => new Color(new Rgba32(r, g, b, a));
 
         public TPixel ToPixel<TPixel>()

tests/ImageSharp.Tests/ColorTests.cs

@@ -1,10 +1,255 @@
 // Copyright (c) Six Labors and contributors.
 // Licensed under the Apache License, Version 2.0.
 
+using SixLabors.ImageSharp.PixelFormats;
+
+using Xunit;
+
 namespace SixLabors.ImageSharp.Tests
 {
     public class ColorTests
     {
+        public class ConstructFrom
+        {
+            [Fact]
+            public void Rgba64()
+            {
+                Rgba64 source = new Rgba64(100, 2222, 3333, 4444);
+                
+                // Act:
+                Color color = new Color(source);
+
+                // Assert:
+                Rgba64 data = color.ToPixel<Rgba64>();
+                Assert.Equal(source, data);
+            }
+            
+            [Fact]
+            public void Rgba32()
+            {
+                Rgba32 source = new Rgba32(1, 22, 33, 231);
+                
+                // Act:
+                Color color = new Color(source);
+
+                // Assert:
+                Rgba32 data = color.ToPixel<Rgba32>();
+                Assert.Equal(source, data);
+            }
+            
+            [Fact]
+            public void Argb32()
+            {
+                Argb32 source = new Argb32(1, 22, 33, 231);
+                
+                // Act:
+                Color color = new Color(source);
+
+                // Assert:
+                Argb32 data = color.ToPixel<Argb32>();
+                Assert.Equal(source, data);
+            }
+            
+            [Fact]
+            public void Bgra32()
+            {
+                Bgra32 source = new Bgra32(1, 22, 33, 231);
+                
+                // Act:
+                Color color = new Color(source);
+
+                // Assert:
+                Bgra32 data = color.ToPixel<Bgra32>();
+                Assert.Equal(source, data);
+            }
+            
+            [Fact]
+            public void Rgb24()
+            {
+                Rgb24 source = new Rgb24(1, 22,  231);
+                
+                // Act:
+                Color color = new Color(source);
+
+                // Assert:
+                Rgb24 data = color.ToPixel<Rgb24>();
+                Assert.Equal(source, data);
+            }
+            
+            [Fact]
+            public void Bgr24()
+            {
+                Bgr24 source = new Bgr24(1, 22,  231);
+                
+                // Act:
+                Color color = new Color(source);
+
+                // Assert:
+                Bgr24 data = color.ToPixel<Bgr24>();
+                Assert.Equal(source, data);
+            }
+        }
         
+        public class Cast
+        {
+            [Fact]
+            public void Rgba64()
+            {
+                Rgba64 source = new Rgba64(100, 2222, 3333, 4444);
+                
+                // Act:
+                Color color = source;
+
+                // Assert:
+                Rgba64 data = color.ToPixel<Rgba64>();
+                Assert.Equal(source, data);
+            }
+            
+            [Fact]
+            public void Rgba32()
+            {
+                Rgba32 source = new Rgba32(1, 22, 33, 231);
+                
+                // Act:
+                Color color = source;
+
+                // Assert:
+                Rgba32 data = color.ToPixel<Rgba32>();
+                Assert.Equal(source, data);
+            }
+            
+            [Fact]
+            public void Argb32()
+            {
+                Argb32 source = new Argb32(1, 22, 33, 231);
+                
+                // Act:
+                Color color = source;
+
+                // Assert:
+                Argb32 data = color.ToPixel<Argb32>();
+                Assert.Equal(source, data);
+            }
+            
+            [Fact]
+            public void Bgra32()
+            {
+                Bgra32 source = new Bgra32(1, 22, 33, 231);
+                
+                // Act:
+                Color color = source;
+
+                // Assert:
+                Bgra32 data = color.ToPixel<Bgra32>();
+                Assert.Equal(source, data);
+            }
+            
+            [Fact]
+            public void Rgb24()
+            {
+                Rgb24 source = new Rgb24(1, 22,  231);
+                
+                // Act:
+                Color color = source;
+
+                // Assert:
+                Rgb24 data = color.ToPixel<Rgb24>();
+                Assert.Equal(source, data);
+            }
+            
+            [Fact]
+            public void Bgr24()
+            {
+                Bgr24 source = new Bgr24(1, 22,  231);
+                
+                // Act:
+                Color color = source;
+
+                // Assert:
+                Bgr24 data = color.ToPixel<Bgr24>();
+                Assert.Equal(source, data);
+            }
+        }
+        
+        public class CastTo
+        {
+            [Fact]
+            public void Rgba64()
+            {
+                Rgba64 source = new Rgba64(100, 2222, 3333, 4444);
+                
+                // Act:
+                Color color = new Color(source);
+
+                // Assert:
+                Rgba64 data = color;
+                Assert.Equal(source, data);
+            }
+            
+            [Fact]
+            public void Rgba32()
+            {
+                Rgba32 source = new Rgba32(1, 22, 33, 231);
+                
+                // Act:
+                Color color = new Color(source);
+
+                // Assert:
+                Rgba32 data = color;
+                Assert.Equal(source, data);
+            }
+            
+            [Fact]
+            public void Argb32()
+            {
+                Argb32 source = new Argb32(1, 22, 33, 231);
+                
+                // Act:
+                Color color = new Color(source);
+
+                // Assert:
+                Argb32 data = color;
+                Assert.Equal(source, data);
+            }
+            
+            [Fact]
+            public void Bgra32()
+            {
+                Bgra32 source = new Bgra32(1, 22, 33, 231);
+                
+                // Act:
+                Color color = new Color(source);
+
+                // Assert:
+                Bgra32 data = color;
+                Assert.Equal(source, data);
+            }
+            
+            [Fact]
+            public void Rgb24()
+            {
+                Rgb24 source = new Rgb24(1, 22,  231);
+                
+                // Act:
+                Color color = new Color(source);
+
+                // Assert:
+                Rgb24 data = color;
+                Assert.Equal(source, data);
+            }
+            
+            [Fact]
+            public void Bgr24()
+            {
+                Bgr24 source = new Bgr24(1, 22,  231);
+                
+                // Act:
+                Color color = new Color(source);
+
+                // Assert:
+                Bgr24 data = color;
+                Assert.Equal(source, data);
+            }
+        }
     }
 }