Question

我正在尝试使用以下代码将字节数组转换为Bitmap图像：

            using (Graphics g = Graphics.FromImage(tilePage))
                g.Clear(Color.Black);

            for (int i = 0; i + offset < ROM.Length && i < tilePage.Height; i++)
            {
                int I = i * tilePage.Width + offset; //+Offset;
                for (int j = 0; j < tilePage.Width; j++)
                {
                    if (I + j >= ROM.Length)
                        goto finishRender;
                    tilePage.SetPixel(j, i, RPallete.getColor(ROM[I + j]));
                }
            }

        finishRender:
            picTileView.Image = tilePage;

但渲染速度太慢（256 * 512分辨率为2-3秒）。如何使它更快，例如在TileLayer中？

P.S。：抱歉英语不好......

Answer 1

您可以使用指针。我最近用过这段代码。您可以随意改进

添加名为pctResim
检查允许项目属性不安全

试试这个：

byte siyah=0;  
    int dizisayisi;    
    IntPtr baslangic;  
    byte[] rgbdeger;  
    Bitmap resim;   
    Rectangle rct;  
    BitmapData bmData;   
    resim = new Bitmap(@"C:\YazilimGrubu.jpg");
    rct = new Rectangle(0, 0, resim.Width, resim.Height);
    bmData = resim.LockBits(rct, ImageLockMode.ReadWrite, resim.PixelFormat);
    baslangic = bmData.Scan0;
    dizisayisi = bmData.Stride * resim.Height;   
    rgbdeger = new byte[dizisayisi];   
    Marshal.Copy(baslangic, rgbdeger, 0, dizisayisi);
    for (int i = 2; i < rgbdeger.Length; i += 3)
    {
    siyah = (Byte)Math.Abs((Byte.Parse(rgbdeger[i - 2].ToString()) + Byte.Parse(rgbdeger[i - 1].ToString()) + Byte.Parse(rgbdeger[i].ToString())) / 3);
    rgbdeger[i - 2] = siyah;
    rgbdeger[i - 1] = siyah;
    rgbdeger[i] = siyah;
    }
    Marshal.Copy(rgbdeger, 0, baslangic, dizisayisi);
    resim.UnlockBits(bmData);
    pctResim.Image = resim;

使位图渲染更快

1 个答案: