Added FromHex and ToHex to color.

Former-commit-id: 60166c603ecbab8d22260406a54e0df01f88fa4d
Former-commit-id: 15b01cc24864cba066426996a85710645f274afd
Former-commit-id: 1221f66d47521eaebe09ff5ad4e0ebd78abc1554

src/ImageProcessorCore/Colors/Color.cs

@@ -201,6 +201,27 @@ namespace ImageProcessorCore
             return left.packedValue != right.packedValue;
         }
 
+        /// <summary>
+        /// Creates a new instance of the <see cref="Color"/> struct.
+        /// </summary>
+        /// <param name="hex">
+        /// The hexadecimal representation of the combined color components arranged
+        /// in rgb, rgba, rrggbb, or rrggbbaa format to match web syntax.
+        /// </param>
+        public static Color FromHex(string hex)
+        {
+            return new Color(hex);
+        }
+
+        /// <summary>
+        /// Converts the value of this instance to a hexadecimal string.
+        /// </summary>
+        /// <returns>A hexadecimal string representation of the value.</returns>
+        public string ToHex()
+        {
+            return this.PackedValue.ToString("X8");
+        }
+
         /// <inheritdoc/>
         public void PackFromVector4(Vector4 vector)
         {
@@ -309,4 +330,4 @@ namespace ImageProcessorCore
             return red + red + green + green + blue + blue + alpha + alpha;
         }
     }
-}
+}

tests/ImageProcessorCore.Tests/Colors/ColorTests.cs

@@ -91,15 +91,31 @@ namespace ImageProcessorCore.Tests
         }
 
         /// <summary>
-        /// Tests to see that in the input hex matches that of the output.
+        /// Tests whether FromHex and ToHex work correctly.
         /// </summary>
         [Fact]
-        public void ConvertHex()
+        public void FromAndToHex()
         {
-            const string First = "000000FF";
+            Color color = Color.FromHex("#AABBCCDD");
-            Color color = Color.Black;
+            Assert.Equal(170, color.R);
-            string second = color.PackedValue.ToString("X8");
+            Assert.Equal(187, color.G);
-            Assert.Equal(First, second);
+            Assert.Equal(204, color.B);
+            Assert.Equal(221, color.A);
+
+            color.A = 170;
+            color.B = 187;
+            color.G = 204;
+            color.R = 221;
+
+            Assert.Equal("DDCCBBAA", color.ToHex());
+
+            color.R = 0;
+
+            Assert.Equal("00CCBBAA", color.ToHex());
+
+            color.A = 255;
+
+            Assert.Equal("00CCBBFF", color.ToHex());
         }
     }
 }