在c#中使用bitblt顯示圖片

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使用bitblt比DrawImage有更好的效能

using AForge.Video.DirectShow;using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Drawing.Imaging;using System.Linq;using System.Runtime.InteropServices;using System.Text;using System.Windows.Forms;namespace HongYing.Test{    public partial class BitBltTester : Form    {        private VideoCaptureDevice videoSource;        public BitBltTester()        {            InitializeComponent();#if GDIPlus            SetStyle(ControlStyles.OptimizedDoubleBuffer, true); //預設啟動雙緩衝            SetStyle(ControlStyles.DoubleBuffer, true);            SetStyle(ControlStyles.UserPaint, true);            SetStyle(ControlStyles.ResizeRedraw, true);            SetStyle(ControlStyles.AllPaintingInWmPaint, true); // 禁止擦除背景.#endif            var videoDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice);            videoSource = new VideoCaptureDevice(videoDevices[1].MonikerString);            videoSource.NewFrame += _videoSource_NewFrame;            videoSource.Start();        }        protected override void OnPaint(PaintEventArgs e)        {            base.OnPaint(e);#if GDIPlus            if (frame != null)            {                e.Graphics.DrawImage(frame, ClientRectangle);            }#else#endif        }        public enum TernaryRasterOperations : uint        {            SRCCOPY = 0x00CC0020,            SRCPAINT = 0x00EE0086,            SRCAND = 0x008800C6,            SRCINVERT = 0x00660046,            SRCERASE = 0x00440328,            NOTSRCCOPY = 0x00330008,            NOTSRCERASE = 0x001100A6,            MERGECOPY = 0x00C000CA,            MERGEPAINT = 0x00BB0226,            PATCOPY = 0x00F00021,            PATPAINT = 0x00FB0A09,            PATINVERT = 0x005A0049,            DSTINVERT = 0x00550009,            BLACKNESS = 0x00000042,            WHITENESS = 0x00FF0062,            CAPTUREBLT = 0x40000000 //only if WinVer >= 5.0.0 (see wingdi.h)        }        Bitmap frame;        private const int SRCCOPY = 0xCC0020;         void _videoSource_NewFrame(object sender, AForge.Video.NewFrameEventArgs eventArgs)        {             frame = (Bitmap)eventArgs.Frame.Clone();#if GDIPlus            Invalidate();#else             Bitmap sourceBitmap = frame;             Graphics sourceGraphics = Graphics.FromImage(frame);             Graphics destGraphics = CreateGraphics();             IntPtr destDC = destGraphics.GetHdc();             IntPtr destCDC = CreateCompatibleDC(destDC);             IntPtr oldDest = SelectObject(destCDC, IntPtr.Zero);             IntPtr sourceDC = sourceGraphics.GetHdc();             IntPtr sourceCDC = CreateCompatibleDC(sourceDC);             IntPtr sourceHB = sourceBitmap.GetHbitmap();             IntPtr oldSource = SelectObject(sourceCDC, sourceHB);             int success = StretchBlt(destDC, 0, 0, Width, Height, sourceCDC, 0, 0, sourceBitmap.Width, sourceBitmap.Height, (int)TernaryRasterOperations.SRCCOPY);             SelectObject(destCDC, oldDest);             SelectObject(sourceCDC, oldSource);             DeleteObject(destCDC);             DeleteObject(sourceCDC);             DeleteObject(sourceHB);             destGraphics.ReleaseHdc();             sourceGraphics.ReleaseHdc();#endif            eventArgs.Frame.Dispose();        }        [System.Runtime.InteropServices.DllImportAttribute("gdi32.dll")]        public static extern IntPtr CreateCompatibleDC(IntPtr hdc);        [System.Runtime.InteropServices.DllImport("gdi32.dll")]        private static extern int BitBlt(        IntPtr hdcDest,     // handle to destination DC (device context)        int nXDest,         // x-coord of destination upper-left corner        int nYDest,         // y-coord of destination upper-left corner        int nWidth,         // width of destination rectangle        int nHeight,        // height of destination rectangle        IntPtr hdcSrc,      // handle to source DC        int nXSrc,          // x-coordinate of source upper-left corner        int nYSrc,          // y-coordinate of source upper-left corner        System.Int32 dwRop  // raster operation code        );        [System.Runtime.InteropServices.DllImportAttribute("gdi32.dll")]        public static extern IntPtr SelectObject(IntPtr hdc, IntPtr obj);        [System.Runtime.InteropServices.DllImportAttribute("gdi32.dll")]        public static extern void DeleteObject(IntPtr obj);        [DllImport("gdi32", EntryPoint = "StretchBlt")]        public static extern int StretchBlt(                IntPtr hdc,                int x,                int y,                int nWidth,                int nHeight,                IntPtr hSrcDC,                int xSrc,                int ySrc,                int nSrcWidth,                int nSrcHeight,                int dwRop        );    }}

參考:experts-exchange.com

在c#中使用bitblt顯示圖片