'Clear()' image operation

src/ImageSharp.Drawing/Processing/Extensions/ClearExtensions.cs

@@ -0,0 +1,72 @@
+// Copyright (c) Six Labors and contributors.
+// Licensed under the Apache License, Version 2.0.
+
+using SixLabors.ImageSharp.Drawing.Processing.Processors.Drawing;
+using SixLabors.ImageSharp.Processing;
+
+namespace SixLabors.ImageSharp.Drawing.Processing
+{
+    /// <summary>
+    /// Adds extensions that allow the clearing of regions with various brushes to the <see cref="Image{TPixel}"/> type.
+    /// </summary>
+    public static class ClearExtensions
+    {
+        /// <summary>
+        /// Clones the graphicoptions and applies changes required to force clearing.
+        /// </summary>
+        /// <param name="options">The optinos to clone</param>
+        /// <returns>A clone of option with ColorBlendingMode, AlphaCompositionMode, and BlendPercentage set</returns>
+        internal static GraphicsOptions CloneForClearOperation(this GraphicsOptions options)
+        {
+            options = options.DeepClone();
+            options.ColorBlendingMode = PixelFormats.PixelColorBlendingMode.Normal;
+            options.AlphaCompositionMode = PixelFormats.PixelAlphaCompositionMode.Src;
+            options.BlendPercentage = 1;
+            return options;
+        }
+
+        /// <summary>
+        /// Flood fills the image with the specified brush without any blending.
+        /// </summary>
+        /// <param name="source">The image this method extends.</param>
+        /// <param name="options">The graphics options.</param>
+        /// <param name="brush">The details how to fill the region of interest.</param>
+        /// <returns>The <see cref="Image{TPixel}"/>.</returns>
+        public static IImageProcessingContext Clear(
+            this IImageProcessingContext source,
+            GraphicsOptions options,
+            IBrush brush)
+            => source.Fill(options.CloneForClearOperation(), brush);
+
+        /// <summary>
+        /// Flood fills the image with the specified brush without any blending.
+        /// </summary>
+        /// <param name="source">The image this method extends.</param>
+        /// <param name="brush">The details how to fill the region of interest.</param>
+        /// <returns>The <see cref="Image{TPixel}"/>.</returns>
+        public static IImageProcessingContext Clear(this IImageProcessingContext source, IBrush brush) =>
+            source.Clear(source.GetGraphicsOptions(), brush);
+
+        /// <summary>
+        /// Flood fills the image with the specified color without any blending.
+        /// </summary>
+        /// <param name="source">The image this method extends.</param>
+        /// <param name="options">The graphics options.</param>
+        /// <param name="color">The color.</param>
+        /// <returns>The <see cref="Image{TPixel}"/>.</returns>
+        public static IImageProcessingContext Clear(
+            this IImageProcessingContext source,
+            GraphicsOptions options,
+            Color color) =>
+            source.Clear(options, new SolidBrush(color));
+
+        /// <summary>
+        /// Flood fills the image with the specified color without any blending.
+        /// </summary>
+        /// <param name="source">The image this method extends.</param>
+        /// <param name="color">The color.</param>
+        /// <returns>The <see cref="Image{TPixel}"/>.</returns>
+        public static IImageProcessingContext Clear(this IImageProcessingContext source, Color color) =>
+            source.Clear(new SolidBrush(color));
+    }
+}

src/ImageSharp.Drawing/Processing/Extensions/ClearPathExtensions.cs

@@ -0,0 +1,78 @@
+// Copyright (c) Six Labors and contributors.
+// Licensed under the Apache License, Version 2.0.
+
+using SixLabors.ImageSharp.Drawing.Processing.Processors.Drawing;
+using SixLabors.ImageSharp.Processing;
+
+namespace SixLabors.ImageSharp.Drawing.Processing
+{
+    /// <summary>
+    /// Adds extensions that allow the filling of polygon outlines to the <see cref="Image{TPixel}"/> type.
+    /// </summary>
+    public static class ClearPathExtensions
+    {/// <summary>
+     /// Clones the graphicoptions and applies changes required to force clearing.
+     /// </summary>
+     /// <param name="shapeOptions">The optinos to clone</param>
+     /// <returns>A clone of shapeOptions with ColorBlendingMode, AlphaCompositionMode, and BlendPercentage set</returns>
+        internal static ShapeGraphicsOptions CloneForClearOperation(this ShapeGraphicsOptions shapeOptions)
+        {
+            var options = shapeOptions.GraphicsOptions.DeepClone();
+            options.ColorBlendingMode = PixelFormats.PixelColorBlendingMode.Normal;
+            options.AlphaCompositionMode = PixelFormats.PixelAlphaCompositionMode.Src;
+            options.BlendPercentage = 1;
+
+            return new ShapeGraphicsOptions(options, shapeOptions.ShapeOptions);
+        }
+
+        /// <summary>
+        /// Flood fills the image in the shape of the provided polygon with the specified brush without any blending.
+        /// </summary>
+        /// <param name="source">The image this method extends.</param>
+        /// <param name="options">The graphics options.</param>
+        /// <param name="brush">The brush.</param>
+        /// <param name="path">The shape.</param>
+        /// <returns>The <see cref="Image{TPixel}"/>.</returns>
+        public static IImageProcessingContext Clear(
+            this IImageProcessingContext source,
+            ShapeGraphicsOptions options,
+            IBrush brush,
+            IPath path) =>
+            source.Fill(options.CloneForClearOperation(), brush, path);
+
+        /// <summary>
+        /// Flood fills the image in the shape of the provided polygon with the specified brush without any blending.
+        /// </summary>
+        /// <param name="source">The image this method extends.</param>
+        /// <param name="brush">The brush.</param>
+        /// <param name="path">The path.</param>
+        /// <returns>The <see cref="Image{TPixel}"/>.</returns>
+        public static IImageProcessingContext Clear(this IImageProcessingContext source, IBrush brush, IPath path) =>
+            source.Clear(source.GetShapeGraphicsOptions(), brush, path);
+
+        /// <summary>
+        /// Flood fills the image in the shape of the provided polygon with the specified brush without any blending.
+        /// </summary>
+        /// <param name="source">The image this method extends.</param>
+        /// <param name="options">The options.</param>
+        /// <param name="color">The color.</param>
+        /// <param name="path">The path.</param>
+        /// <returns>The <see cref="Image{TPixel}"/>.</returns>
+        public static IImageProcessingContext Clear(
+            this IImageProcessingContext source,
+            ShapeGraphicsOptions options,
+            Color color,
+            IPath path) =>
+            source.Clear(options, new SolidBrush(color), path);
+
+        /// <summary>
+        /// Flood fills the image in the shape of the provided polygon with the specified brush without any blending.
+        /// </summary>
+        /// <param name="source">The image this method extends.</param>
+        /// <param name="color">The color.</param>
+        /// <param name="path">The path.</param>
+        /// <returns>The <see cref="Image{TPixel}"/>.</returns>
+        public static IImageProcessingContext Clear(this IImageProcessingContext source, Color color, IPath path) =>
+            source.Clear(new SolidBrush(color), path);
+    }
+}

src/ImageSharp.Drawing/Processing/Extensions/ClearRectangleExtensions.cs

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+// Copyright (c) Six Labors and contributors.
+// Licensed under the Apache License, Version 2.0.
+
+using SixLabors.ImageSharp.Processing;
+
+namespace SixLabors.ImageSharp.Drawing.Processing
+{
+    /// <summary>
+    /// Adds extensions that allow the filling of rectangles to the <see cref="Image{TPixel}"/> type.
+    /// </summary>
+    public static class ClearRectangleExtensions
+    {
+        /// <summary>
+        /// Flood fills the image in the shape of the provided rectangle with the specified brush without any blending.
+        /// </summary>
+        /// <param name="source">The image this method extends.</param>
+        /// <param name="options">The options.</param>
+        /// <param name="brush">The brush.</param>
+        /// <param name="shape">The shape.</param>
+        /// <returns>The <see cref="Image{TPixel}"/>.</returns>
+        public static IImageProcessingContext Clear(
+            this IImageProcessingContext source,
+            ShapeGraphicsOptions options,
+            IBrush brush,
+            RectangleF shape) =>
+            source.Clear(options, brush, new RectangularPolygon(shape.X, shape.Y, shape.Width, shape.Height));
+
+        /// <summary>
+        /// Flood fills the image in the shape of the provided rectangle with the specified brush without any blending.
+        /// </summary>
+        /// <param name="source">The image this method extends.</param>
+        /// <param name="brush">The brush.</param>
+        /// <param name="shape">The shape.</param>
+        /// <returns>The <see cref="Image{TPixel}"/>.</returns>
+        public static IImageProcessingContext Clear(this IImageProcessingContext source, IBrush brush, RectangleF shape) =>
+            source.Clear(brush, new RectangularPolygon(shape.X, shape.Y, shape.Width, shape.Height));
+
+        /// <summary>
+        /// Flood fills the image in the shape of the provided rectangle with the specified brush without any blending.
+        /// </summary>
+        /// <param name="source">The image this method extends.</param>
+        /// <param name="options">The options.</param>
+        /// <param name="color">The color.</param>
+        /// <param name="shape">The shape.</param>
+        /// <returns>The <see cref="Image{TPixel}"/>.</returns>
+        public static IImageProcessingContext Clear(
+            this IImageProcessingContext source,
+            ShapeGraphicsOptions options,
+            Color color,
+            RectangleF shape) =>
+            source.Clear(options, new SolidBrush(color), shape);
+
+        /// <summary>
+        /// Flood fills the image in the shape of the provided rectangle with the specified brush without any blending.
+        /// </summary>
+        /// <param name="source">The image this method extends.</param>
+        /// <param name="color">The color.</param>
+        /// <param name="shape">The shape.</param>
+        /// <returns>The <see cref="Image{TPixel}"/>.</returns>
+        public static IImageProcessingContext Clear(this IImageProcessingContext source, Color color, RectangleF shape) =>
+            source.Clear(new SolidBrush(color), shape);
+    }
+}

src/ImageSharp.Drawing/Processing/Extensions/ClearRegionExtensions.cs

@@ -0,0 +1,64 @@
+// Copyright (c) Six Labors and contributors.
+// Licensed under the Apache License, Version 2.0.
+
+using SixLabors.ImageSharp.Drawing.Processing.Processors.Drawing;
+using SixLabors.ImageSharp.Processing;
+
+namespace SixLabors.ImageSharp.Drawing.Processing
+{
+    /// <summary>
+    /// Adds extensions that allow the filling of regions with various brushes to the <see cref="Image{TPixel}"/> type.
+    /// </summary>
+    public static class ClearRegionExtensions
+    {
+        /// <summary>
+        /// Flood fills the image with in the region with the specified brush without any blending.
+        /// </summary>
+        /// <param name="source">The image this method extends.</param>
+        /// <param name="brush">The brush.</param>
+        /// <param name="region">The region.</param>
+        /// <returns>The <see cref="Image{TPixel}"/>.</returns>
+        public static IImageProcessingContext Clear(this IImageProcessingContext source, IBrush brush, Region region) =>
+            source.Clear(source.GetShapeGraphicsOptions(), brush, region);
+
+        /// <summary>
+        /// Flood fills the image with in the region with the specified brush without any blending.
+        /// </summary>
+        /// <param name="source">The image this method extends.</param>
+        /// <param name="options">The graphics options.</param>
+        /// <param name="brush">The brush.</param>
+        /// <param name="region">The region.</param>
+        /// <returns>The <see cref="Image{TPixel}"/>.</returns>
+        public static IImageProcessingContext Clear(
+            this IImageProcessingContext source,
+            ShapeGraphicsOptions options,
+            IBrush brush,
+            Region region) =>
+            source.Fill(options.CloneForClearOperation(), brush, region);
+
+        /// <summary>
+        /// Flood fills the image with in the region with the specified color without any blending.
+        /// </summary>
+        /// <param name="source">The image this method extends.</param>
+        /// <param name="options">The options.</param>
+        /// <param name="color">The color.</param>
+        /// <param name="region">The region.</param>
+        /// <returns>The <see cref="Image{TPixel}"/>.</returns>
+        public static IImageProcessingContext Clear(
+            this IImageProcessingContext source,
+            ShapeGraphicsOptions options,
+            Color color,
+            Region region) =>
+            source.Clear(options, new SolidBrush(color), region);
+
+        /// <summary>
+        /// Flood fills the image with in the region with the specified color without any blending.
+        /// </summary>
+        /// <param name="source">The image this method extends.</param>
+        /// <param name="color">The color.</param>
+        /// <param name="region">The region.</param>
+        /// <returns>The <see cref="Image{TPixel}"/>.</returns>
+        public static IImageProcessingContext Clear(this IImageProcessingContext source, Color color, Region region) =>
+            source.Clear(new SolidBrush(color), region);
+    }
+}