插补算法的速度,C++和C++的协同工作

我需要快速实现流行的插值算法。我发现C在这样简单的算法中会比C++慢得多,所以我想编写一些本地代码并将其应用到我的C语言GUI中。

首先,我运行一些测试和一些操作 1024x1024x3 矩阵在C中使用了32毫秒,在C++中使用了4ms,这就是我所需要的。

但插值不是一个好词,因为我只需要他们缩小规模。但问题是:它是否会比Drawing2D中的C方法更快?

Image outputImage = new Bitmap(destWidth, destHeight, PixelFormat.Format24bppRgb);
Graphics grPhoto = Graphics.FromImage(outputImage);

grPhoto.InterpolationMode = InterpolationMode.*; //all of them

grPhoto.DrawImage(bmp, new Rectangle(0, 0, destWidth, destHeight),
Rectangle(0, 0, sourceWidth, sourceHeight), GraphicsUnit.Pixel);

grPhoto.Dispose();

这些方法有的在20毫秒内完成,有的在80毫秒内完成。有没有办法更快的完成?

编辑1:

首先,我在这个应用程序中使用xna,但是似乎没有办法选择不同的插值方法。当然它工作得很快。

理想的方法是在图形卡上实现这些方法。

编辑2:

以下是我的整个方法:

private unsafe Texture2D Scale(GraphicsDevice gd, Texture2D texture, float scale)
    {

        int sourceWidth = texture.Width;
        int sourceHeight = texture.Height;

        int destWidth = (int)(sourceWidth * scale);
        int destHeight = (int)(sourceHeight * scale);

        StopwatchEx sw = new StopwatchEx();
        sw.IntervalStart();
        //convert texture into bitmap
        byte[] textureData = new byte[4 * sourceWidth * sourceHeight];
        texture.GetData<byte>(textureData);

        System.Drawing.Bitmap bmp = new System.Drawing.Bitmap(sourceWidth, sourceHeight, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
        System.Drawing.Imaging.BitmapData bmpData = bmp.LockBits(new System.Drawing.Rectangle(0, 0, sourceWidth, sourceHeight), System.Drawing.Imaging.ImageLockMode.WriteOnly,
                       System.Drawing.Imaging.PixelFormat.Format32bppArgb);

        IntPtr safePtr = bmpData.Scan0;
        System.Runtime.InteropServices.Marshal.Copy(textureData, 0, safePtr, textureData.Length);
        bmp.UnlockBits(bmpData);


        //output bitmap
        System.Drawing.Image outputImage = new System.Drawing.Bitmap(destWidth, destHeight, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
        System.Drawing.Graphics grPhoto = System.Drawing.Graphics.FromImage(outputImage);

        grPhoto.InterpolationMode = (System.Drawing.Drawing2D.InterpolationMode)(interpolationMode);
        grPhoto.SmoothingMode = (System.Drawing.Drawing2D.SmoothingMode)smoothingMode;
        grPhoto.PixelOffsetMode = (System.Drawing.Drawing2D.PixelOffsetMode)pixelOffsetMode;

        grPhoto.DrawImage((System.Drawing.Image)bmp, new System.Drawing.Rectangle(0, 0, destWidth, destHeight),
            new System.Drawing.Rectangle(0, 0, sourceWidth, sourceHeight), System.Drawing.GraphicsUnit.Pixel);

        grPhoto.Dispose();

        textureData = new byte[4 * sourceWidth * sourceHeight];

        MemoryStream ms = new MemoryStream();
        ((System.Drawing.Bitmap)outputImage).Save(ms, System.Drawing.Imaging.ImageFormat.Bmp);

        ms.Seek(0, SeekOrigin.Begin);
        Texture2D result = Texture2D.FromFile(gd, ms);
        ms.Dispose();
        sw.IntervalStop();
        sw.AppendResults("MEGS.txt");    

        return result;
    }

有趣的是高质量双三次比双三次快得多。(40毫秒对100毫秒)