// Copyright (c) Six Labors.
// Licensed under the Six Labors Split License.

using SixLabors.ImageSharp.PixelFormats;
using SixLabors.ImageSharp.Processing;
using System.Numerics;

namespace SixLabors.ImageSharp.Drawing.Processing {
  /// <summary>
  /// Adds extensions that help working with <see cref="DrawingOptions" />.
  /// </summary>
  public static class DrawingOptionsDefaultsExtensions
  {
      /// <summary>
      /// Gets the default drawing options against the source image processing context.
      /// </summary>
      /// <param name="context">The image processing context to retrieve defaults from.</param>
      /// <returns>The globally configured default options.</returns>
      public static DrawingOptions GetDrawingOptions(this IImageProcessingContext context)
          => new(context.GetGraphicsOptions(), new ShapeOptions(), Matrix4x4.Identity);

      /// <summary>
      /// Clones the path graphic options and applies changes required to force clearing.
      /// </summary>
      /// <param name="drawingOptions">The drawing options to clone</param>
      /// <returns>A clone of shapeOptions with ColorBlendingMode, AlphaCompositionMode, and BlendPercentage set</returns>
      internal static DrawingOptions CloneForClearOperation(this DrawingOptions drawingOptions)
      {
          GraphicsOptions options = drawingOptions.GraphicsOptions.DeepClone();
          options.ColorBlendingMode = PixelColorBlendingMode.Normal;
          options.AlphaCompositionMode = PixelAlphaCompositionMode.Src;
          options.BlendPercentage = 1F;

          return new DrawingOptions(options, drawingOptions.ShapeOptions, drawingOptions.Transform);
      }
  }
}