SkiaSharp

[HttpGet]
[NonUnify]
public IActionResult AvatarTest()
{
    // info 为你的画布大小 例如 with=750 hight=1024
    var info = new SKImageInfo(750, 1024);
    // create the surface using the information
    var surface = SKSurface.Create(info);
    //载入底图
    var bmp = SKBitmap.Decode("C:\\Users\\Administrator\\source\\repos\\FurionProject\\FurionProject.Web.Entry\\img\\mb.jpg");
    //初始化画布
    var canvas = surface.Canvas;
    // create a paint object so that drawing can happen at a higher resolution
    //创建一个绘制对象，以便绘制可以以更高的分辨率进行
    using (var paint = new SKPaint())
    {
        paint.IsAntialias = true;
        paint.FilterQuality = SKFilterQuality.High;
        canvas.DrawBitmap(bmp, info.Rect, paint);
    }
    canvas.Save();

    using (var avatarImage = SKImage.FromBitmap(SKBitmap.Decode("C:\\Users\\Administrator\\source\\repos\\FurionProject\\FurionProject.Web.Entry\\img\\gz.png")))
    {
        // 35,50是你图片的坐标 注意：不要超出画布的大小，否则无法显示 300 300是图片的大小
        var rect = SKRect.Create(35, 50, 300, 300);
        canvas.DrawImage(avatarImage, rect);
    }
    //恢复画布状态为全图绘制状态，在画布上绘制后填写
    canvas.Restore();


    //最后把你画的图片保存到本地
    var image = surface.Snapshot();
    // encode the image as a PNG+
    var data = image.Encode(SKEncodedImageFormat.Png, 100);

    //string filname = "ss.png";
    //using (var stream = File.OpenWrite(filname))
    //{
    //    data.SaveTo(stream);
    //}

    var arrByte= data.ToArray();
    

    return new FileContentResult(arrByte, "image/jpeg");
}

转：.NET Core使用canvas的常用方法 SKPath SKPaint SKRect等-蒲公英云 (dandelioncloud.cn)