还用了其他方法：
1.利用BitBlt合成图片
public void SetImage()
{
DateTime dt = DateTime.Now;
if (this.Body != null)
{
this.s_image = new Bitmap(this.Body.Width, this.Body.Height);
using (Graphics g = Graphics.FromImage(this.s_image))
{
IntPtr hdc = g.GetHdc();
DateTime dt4 = DateTime.Now;
IntPtr memdc = Win32Support.CreateCompatibleDC(hdc);
Console.WriteLine("创建层：" + (DateTime.Now - dt4));
for (int i = 0; i < elements.Length; ++i)
{
if (elements[i] != null)
{
DateTime dt3 = DateTime.Now;
Win32Support.SelectObject(memdc, elements[i].GetHbitmap());
Console.WriteLine("创建第" + i + "层：" + (DateTime.Now - dt3));
using (Graphics memDc = Graphics.FromHdc(memdc))
{
IntPtr shdc = memDc.GetHdc();
if (i != 4)
{
DateTime dt1 = DateTime.Now;
Win32Support.BitBlt(hdc, p_list.PointArray[i].X, p_list.PointArray[i].Y, this.Body.Width, this.Body.Height,
shdc, 0, 0, Win32Support.TernaryRasterOperations.SRCCOPY);
Console.WriteLine("绘制第" + i + "层：" + (DateTime.Now - dt1));
}
else
{
if (has_glassses)
{
DateTime dt1 = DateTime.Now;
Win32Support.BitBlt(hdc, p_list.PointArray[i].X, p_list.PointArray[i].Y, this.Body.Width, this.Body.Height,
shdc, 0, 0, Win32Support.TernaryRasterOperations.SRCCOPY);
Console.WriteLine("绘制第" + i + "层：" + (DateTime.Now - dt1));
}
}
memDc.ReleaseHdc(shdc);
}
}
}
g.ReleaseHdc(hdc);
}
}
Console.WriteLine("总共：" + (DateTime.Now - dt));
}
速度没有提高，并只显示最后一层，透明处全部成黑色
2.利用BitmapData合成图片
public void SetImage(){
DateTime dt = DateTime.Now;
if (this.Body != null)
{
int w = Convert.ToInt32(this.Body.Width * _scale);
int h = Convert.ToInt32(this.Body.Height * _scale);
this.s_image = new Bitmap(w, h);
BitmapData dataOut = this.s_image.LockBits(new Rectangle(0, 0, w, h), ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);
for (int i = 0; i < elements.Length; ++i)
{
if (elements[i] != null)
{
if (i != 4)
{
try
{
DateTime dt1 = DateTime.Now;
Rectangle rect = new Rectangle(0, 0, w, h);
DrawImage(ref dataOut, elements[i], rect);
Console.WriteLine("绘制第" + i + "层：" + (DateTime.Now - dt1));
}
catch (Exception ex)
{
Console.WriteLine(ex.StackTrace);
}
}
else
{
if (has_glassses)
{
DateTime dt1 = DateTime.Now;
Rectangle rect = new Rectangle(0, 0, w, h);
DrawImage(ref dataOut, elements[i], rect);
Console.WriteLine("绘制第" + i + "层：" + (DateTime.Now - dt1));
}
}
}
}
this.s_image.UnlockBits(dataOut);
}
Console.WriteLine("共用时间：" + (DateTime.Now - dt));
}
private void DrawImage(ref BitmapData dataOut, Bitmap btpIn, Rectangle rect)
{
BitmapData dataIn = btpIn.LockBits(rect, ImageLockMode.ReadOnly, PixelFormat.Format24bppRgb);
unsafe
{
byte* pIn = (byte*)(dataIn.Scan0.ToPointer());
byte* pOut = (byte*)(dataOut.Scan0.ToPointer());
for (int y = 0; y < dataIn.Height; y++)
{
for (int x = 0; x < dataIn.Width; x++)
{
if ((int)pIn[4] != 0)
{
pOut[0] = pIn[0];
pOut[1] = pIn[1];
pOut[2] = pIn[2];
pOut[4] = pIn[4];
}
pIn += 3;
pOut += 3;
}
pIn += dataIn.Stride - dataIn.Width * 3;
pOut += dataOut.Stride - dataOut.Width * 3;
}
}
btpIn.UnlockBits(dataIn);
}
速度没有提高，也是显示最后一层，透明处全部成白色
还没有其他方法！现在项目一运行就的等待10多秒钟！慢死了
