在做绘图相关工作，由于对显示绘制结果实时性有要求，筛选了GDI ， 与GDI+ 贴图性能。

这里假设在内存中已绘制完成一张图片，现需求显示在控件上，同时，总是更新全部区域。

GDI+ 实现

private void PainDraw(Bitmap bitmap) {            pictureBox1.Invalidate();            //只调用Invalidate() 并非实时更新， 它会合并多个无效区，且延时显示， Update（） 强制更新             pictureBox1.Update();        }    private void pictureBox1_Paint(object sender, PaintEventArgs e)        {            i++;            if (i > 500)            {                i = 0;            }           e.Graphics.DrawImage(bitmap, new Rectangle(i, 0, bitmap.Width, bitmap.Height));        }

 

调用1000次，测帧速

private void button2_Click(object sender, EventArgs e)        {            System.Diagnostics.Stopwatch stopWatch = new System.Diagnostics.Stopwatch();            path = @"C:\Users\zhoupeng\Pictures\BackgroundDefault.bmp";            if (bitmap == null)                bitmap = new Bitmap(path);            stopWatch.Start();            for (int i = 0; i < 1000; i++)            {                PainDraw(bitmap);            }            stopWatch.Stop();            Console.WriteLine("帧率:{0}", 1000 / (stopWatch.ElapsedMilliseconds / 1000f));        }

 

结果：

帧率:88.81783

帧率:91.14108

帧率:92.28497

帧率:83.167

 

GDI 实现

int i = 0;        private void SnapShot(PictureBox c, Bitmap bitmapsrc, IntPtr dc1)        {            IntPtr dc2 = GetWindowDC(c.Handle);            i++;            if (i > 500) {                i = 0;            }            BitBlt(dc2, i, 0, bitmapsrc.Width, bitmapsrc.Height, dc1, 0, 0, TernaryRasterOperations.SRCCOPY);            DeleteDC(dc2);        }    private void button3_Click(object sender, EventArgs e)        {            System.Diagnostics.Stopwatch stopWatch = new System.Diagnostics.Stopwatch();            path = @"C:\Users\zhoupeng\Pictures\BackgroundDefault.bmp";            if (bitmap == null)                bitmap = new Bitmap(path);            stopWatch.Start();            Graphics g = Graphics.FromImage( bitmap);            IntPtr dc1 = CreateCompatibleDC(g.GetHdc());            IntPtr dcbitmap;            IntPtr pOrig = SelectObject(dc1, dcbitmap = bitmap.GetHbitmap());            for (int i = 0; i < 1000; i++)            {                SnapShot(pictureBox1, bitmap, dc1);            }            DeleteDC(dc1);            DeleteObject(dcbitmap);            g.ReleaseHdc(dc1);            g.Dispose();            stopWatch.Stop();            Console.WriteLine("帧率:{0}", 1000 / (stopWatch.ElapsedMilliseconds / 1000f));        }

 

 

结果：

帧率:4651.163

帧率:4385.965

帧率:7812.5

帧率:5208.333