Add Color.Transparent

Former-commit-id: d18d0ef6b152c19270e54157e1026490040a6cab
Former-commit-id: 1d1d7bda80c783f9cb1e8c8b1ebfeca2de750d53
Former-commit-id: 421d0caa589e3609c75e01d21b48e15c54fe7aae

README.md

@@ -58,7 +58,7 @@ git clone https://github.com/JimBobSquarePants/ImageProcessor
  - [x] Rectangle
  - [x] Size
  - [x] Point
- - [ ] Ellipse
+ - [x] Ellipse
 - Resampling algorithms. (Performance improvements?)
  - [x] Box
  - [x] Bicubic
@@ -78,8 +78,8 @@ git clone https://github.com/JimBobSquarePants/ImageProcessor
  - [ ] Elliptical Crop
  - [x] Entropy Crop
 - Rotation
- - [x] Flip (90, 270, FlipType etc. Need help)
- - [ ] Rotate by angle (Need help with Paeth approach) [#258](https://github.com/JimBobSquarePants/ImageProcessor/issues/258)
+ - [x] Flip (90, 270, FlipType etc)
+ - [x] Rotate by angle
 - ColorMatrix operations (Uses Matrix4x4)
  - [x] BlackWhite
  - [x] Greyscale BT709
@@ -113,6 +113,8 @@ git clone https://github.com/JimBobSquarePants/ImageProcessor
  - [x] Hue
  - [x] Blend
  - [ ] Mask
+ - [x] Vignette
+ - [x] Glow
 - Effects
  - [ ] Path brush (Need help) [#264](https://github.com/JimBobSquarePants/ImageProcessor/issues/264)
  - [ ] Pattern brush (Need help) [#264](https://github.com/JimBobSquarePants/ImageProcessor/issues/264)

src/ImageProcessor/Colors/ColorDefinitions.cs

@@ -719,5 +719,10 @@ namespace ImageProcessor
         /// Represents a <see cref="Color"/> matching the W3C definition that has a hex triplet value of #9ACD32.
         /// </summary>
         public static readonly Color YellowGreen = new Color(154 / 255f, 205 / 255f, 50 / 255f);
+
+        /// <summary>
+        /// Represents a system-defined <see cref="Color"/> that has an ARGB value of #00FFFFFF.
+        /// </summary>
+        public static readonly Color Transparent = new Color(1, 1, 1, 0);
     }
 }

tests/ImageProcessor.Tests/Processors/ProcessorTestBase.cs

@@ -19,11 +19,11 @@ namespace ImageProcessor.Tests
         /// </summary>
         public static readonly List<string> Files = new List<string>
         {
-            "TestImages/Formats/Jpg/Floorplan.jpeg",
+            //"TestImages/Formats/Jpg/Floorplan.jpeg", //Perf: Enable for local testing only
             "TestImages/Formats/Jpg/Calliphora.jpg",
             //"TestImages/Formats/Jpg/gamma_dalai_lama_gray.jpg", //Perf: Enable for local testing only
             "TestImages/Formats/Bmp/Car.bmp",
-            "TestImages/Formats/Png/blur.png", //Perf: Enable for local testing only
+            //"TestImages/Formats/Png/blur.png", //Perf: Enable for local testing only
             "TestImages/Formats/Png/splash.png",
             "TestImages/Formats/Gif/rings.gif",
             //"TestImages/Formats/Gif/giphy.gif" //Perf: Enable for local testing only

tests/ImageProcessor.Tests/Processors/Samplers/SamplerTests.cs

@@ -15,18 +15,18 @@
             {
                 { "Bicubic", new BicubicResampler() },
                 { "Triangle", new TriangleResampler() },
-                { "Box", new BoxResampler() },
-                { "Lanczos3", new Lanczos3Resampler() },
-                { "Lanczos5", new Lanczos5Resampler() },
-                { "Lanczos8", new Lanczos8Resampler() },
-                { "MitchellNetravali", new MitchellNetravaliResampler() },
-                { "NearestNeighbor", new NearestNeighborResampler() },
-                { "Hermite", new HermiteResampler() },
-                { "Spline", new SplineResampler() },
-                { "Robidoux", new RobidouxResampler() },
-                { "RobidouxSharp", new RobidouxSharpResampler() },
-                { "RobidouxSoft", new RobidouxSoftResampler() },
-                { "Welch", new WelchResampler() }
+                //{ "Box", new BoxResampler() },
+                //{ "Lanczos3", new Lanczos3Resampler() },
+                //{ "Lanczos5", new Lanczos5Resampler() },
+                //{ "Lanczos8", new Lanczos8Resampler() },
+                //{ "MitchellNetravali", new MitchellNetravaliResampler() },
+                //{ "NearestNeighbor", new NearestNeighborResampler() },
+                //{ "Hermite", new HermiteResampler() },
+                //{ "Spline", new SplineResampler() },
+                //{ "Robidoux", new RobidouxResampler() },
+                //{ "RobidouxSharp", new RobidouxSharpResampler() },
+                //{ "RobidouxSoft", new RobidouxSoftResampler() },
+                //{ "Welch", new WelchResampler() }
             };
 
         public static readonly TheoryData<RotateType, FlipType> RotateFlips = new TheoryData<RotateType, FlipType>
@@ -167,7 +167,7 @@
                     using (FileStream output = File.OpenWrite($"TestOutput/Rotate/{filename}"))
                     {
                         image.Rotate(45, sampler)
-                             .BackgroundColor(Color.Aqua)
+                             //.BackgroundColor(Color.Aqua)
                              .Save(output);
                     }