完成从 Gdi 拷贝的功能

Author: lindexi

src/MediaConverters/MediaConverters.Lib/Imaging/Effect/BitmapEffectExtension.cs

@@ -0,0 +1,145 @@
+using DotNetCampus.MediaConverters.Imaging.Effect.Color;
+
+using SixLabors.ImageSharp;
+using SixLabors.ImageSharp.PixelFormats;
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using DotNetCampus.MediaConverters.Imaging.Effect.Extensions;
+
+namespace DotNetCampus.MediaConverters.Imaging.Effect;
+
+/// <summary>
+/// 为<see cref="Image{T}"/>提供效果拓展
+/// </summary>
+public static class BitmapEffectExtension
+{
+    /// <summary>
+    ///     将图片<paramref name="bitmap"/>上指定的颜色<paramref name="sourceColor"/>替换为颜色<paramref name="targetColor"/>
+    /// </summary>
+    /// <param name="bitmap">图片</param>
+    /// <param name="sourceColor">原始颜色</param>
+    /// <param name="targetColor">目标颜色</param>
+    public static void ReplaceColor(this Image<Rgba32> bitmap, ColorMetadata sourceColor, ColorMetadata targetColor)
+    {
+        bitmap.PerPixelProcess(color =>
+            color.IsNearlyEquals(sourceColor) ? targetColor : color);
+    }
+
+    /// <summary>
+    ///     将图片<paramref name="bitmap"/>上指定的一部分颜色替换为指定的对应颜色
+    /// </summary>
+    /// <param name="bitmap">图片</param>
+    /// <param name="colorInfos">存储替换信息的颜色组</param>
+    public static void ReplaceColor(this Image<Rgba32> bitmap, Dictionary<ColorMetadata, ColorMetadata> colorInfos)
+    {
+        bitmap.PerPixelProcess(color =>
+        {
+            foreach (var colorInfo in colorInfos)
+            {
+                if (color.IsNearlyEquals(colorInfo.Key))
+                {
+                    return colorInfo.Value;
+                }
+            }
+
+            return color;
+        });
+    }
+
+    /// <summary>
+    ///     对图片<paramref name="bitmap"/>设置(DuotoneEffect)双色调效果
+    /// </summary>
+    /// <param name="bitmap"></param>
+    /// <param name="color1"></param>
+    /// <param name="color2"></param>
+    public static void SetDuotoneEffect(this Image<Rgba32> bitmap, ColorMetadata color1, ColorMetadata color2)
+    {
+        bitmap.PerPixelProcess(color => color.GetDuotoneColor(color1, color2));
+    }
+
+    /// <summary>
+    ///     设置黑白图效果
+    /// </summary>
+    /// <param name="bitmap"></param>
+    /// <param name="threshold">像素灰度大于该阈值设为白色，否则为黑色。范围 0-1</param>
+    public static void SetBlackWhiteEffect(this Image<Rgba32> bitmap, float threshold)
+    {
+        bitmap.PerPixelProcess(color =>
+        {
+            var v = color.GetGrayScale() >= threshold ? 1 : 0;
+            return new ColorMetadata(v, v, v, color.ARGB.Item4);
+        });
+    }
+
+    /// <summary>
+    ///     更改当前图像的亮度。
+    /// </summary>
+    /// <param name="bitmap">图片</param>
+    /// <param name="percentage">转化比例，必须大于或等于 0。
+    /// <remarks>
+    /// 值为 0 将创建一个完全黑色的图像。值为 1 时输入保持不变。
+    /// 其他值是效果的线性乘数。允许超过 1 的值，从而提供更明亮的结果。
+    /// </remarks>
+    /// </param>
+    public static void SetBrightness(this Image<Rgba32> bitmap, float percentage)
+    {
+        var colorMatrix = ColorMatrices.CreateBrightnessFilter(percentage);
+        bitmap.PerPixelProcess(color => color.ApplyMatrix(colorMatrix));
+    }
+
+    /// <summary>
+    ///     更改当前图像的对比度。
+    /// </summary>
+    /// <param name="bitmap">图片</param>
+    /// <param name="percentage">转化比例，必须大于或等于 0。
+    /// <remarks>
+    /// 值为 0 将创建一个完全灰色的图像。值为 1 时输入保持不变。
+    /// 其他值是效果的线性乘数。允许超过 1 的值，从而提供具有更高对比度的结果。
+    /// </remarks>
+    /// </param>
+    public static void SetContrast(this Image<Rgba32> bitmap, float percentage)
+    {
+        var colorMatrix = ColorMatrices.CreateContrastFilter(percentage);
+        bitmap.PerPixelProcess(color => color.ApplyMatrix(colorMatrix));
+    }
+
+    /// <summary>
+    ///     设置灰度图效果。
+    /// </summary>
+    /// <param name="bitmap">图片</param>
+    public static void SetGrayScaleEffect(this Image<Rgba32> bitmap)
+    {
+        var colorMatrix = ColorMatrices.CreateGrayScaleFilter(1);
+        bitmap.PerPixelProcess(color => color.ApplyMatrix(colorMatrix));
+    }
+
+    /// <summary>
+    ///     设置冲蚀效果。
+    /// </summary>
+    /// <param name="bitmap">图片</param>
+    public static void SetLuminanceEffect(this Image<Rgba32> bitmap)
+    {
+        bitmap.SetContrast(0.2f);
+        bitmap.SetBrightness(1.9f);
+    }
+
+    /// <summary>
+    ///     设置柔化边缘效果
+    /// </summary>
+    /// <param name="bitmap"></param>
+    /// <param name="radius"></param>
+    public static void SetSoftEdgeEffect(this Image<Rgba32> bitmap, float radius)
+    {
+        //var pixelFormat = bitmap.PixelFormat;
+        //if (pixelFormat != PixelFormat.Format32bppArgb)
+        //{
+        //    throw new NotSupportedException($"Only {PixelFormat.Format32bppArgb} image pixel format is supported.");
+        //}
+
+        SoftEdgeHelper.SetSoftEdgeMask(bitmap, radius);
+    }
+}

src/MediaConverters/MediaConverters.Lib/Imaging/Effect/Extensions/BitmapExtension.cs

@@ -14,7 +14,7 @@ namespace DotNetCampus.MediaConverters.Imaging.Effect.Extensions;
 /// <summary>
 /// <see cref="Image{Rgba32}"/>拓展
 /// </summary>
-public static class BitmapExtension
+internal static class BitmapExtension
 {
     #region 逐像素处理
 

src/MediaConverters/MediaConverters.Lib/Imaging/Effect/Extensions/ColorExtension.cs

@@ -16,7 +16,7 @@ namespace DotNetCampus.MediaConverters.Imaging.Effect.Extensions;
 /// <summary>
 /// 颜色拓展方法
 /// </summary>
-public static class ColorExtension
+internal static class ColorExtension
 {
     /// <summary>
     /// 在图像上执行颜色矩阵的应用。