netcore SkiaSharp Compress Resize Add Image Watermark

1.cs

static void Resize(string filepath, int quality = 75, string watermarkpath = @"C:\Users\ddd\Desktop\123\water.png")
{

    using (var water = File.OpenRead(watermarkpath))
    {
        SKBitmap waterBitmap = SKBitmap.Decode(water);
        using (var file = File.OpenRead(filepath))
        {
            var rawLength = file.Length;
            if (filepath.EndsWith("gif"))
            {
                return;
            }
            SKBitmap bitmap = SKBitmap.Decode(file);
            SKBitmap resizeBitmap = bitmap.Resize(new SKImageInfo(bitmap.Width, bitmap.Height), SKFilterQuality.High);

            using (var surface = SKSurface.Create(resizeBitmap.Info))
            {
                SKCanvas canvas = surface.Canvas;
                canvas.Clear(SKColors.White);

                canvas.DrawBitmap(bitmap, 0, 0);
                if (bitmap.Width < waterBitmap.Width || bitmap.Height < waterBitmap.Height)
                {
                    Console.WriteLine("水印大于图片,跳过此图片.");
                }
                else
                {
                    canvas.DrawBitmap(waterBitmap, bitmap.Width - waterBitmap.Width, bitmap.Height - waterBitmap.Height);
                }
                using (SKImage img = surface.Snapshot())
                {
                    SKData data = img.Encode(SKEncodedImageFormat.Jpeg, quality);
                    var result = ((rawLength - data.ToArray().Length) * 100 / rawLength);
                    Console.WriteLine($"{file.Name} resized size:{data.ToArray().Length} raw size:{rawLength} change:{result}%");

                    File.WriteAllBytes(filepath, data.ToArray());
                }
            }
        }
    }
}