在c#中使用bitblt顯示圖片
阿新 • • 發佈：2018-01-27
dso key order dex 性能 tco ret += windows
使用bitblt比DrawImage有更好的性能,實際使用中，毛邊現象比較嚴重。
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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;
namespaceHongYing.Test
{
public partial class BitBltTester : Form
{
private VideoCaptureDevice videoSource;
public BitBltTester()
{
InitializeComponent();
#if GDIPlus
SetStyle(ControlStyles.OptimizedDoubleBuffer, true); //默認啟動雙緩沖
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
);
}
}
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在c#中使用bitblt顯示圖片