bitblt 拉伸_bitblt_bitblt 性能(2)

g.FillRectangle(sb,rect);

Pointpt=newPoint((rect.Width-img.Width)/2,(rect.Height-img.Height)/2);

RectanglerectScreen=System.Windows.Forms.Screen.PrimaryScreen.Bounds;

if(img.Width<=rectScreen.Width&&img.Height<=rectScreen.Height)

pt=newPoint(rectScreen.Left+(rectScreen.Width-img.Width)/2,rectScreen.Top+(rectScreen.Height-img.Height)/2);

g.DrawImage(img,pt);

}

}

}

hBmp=Win32.SelectObject(hMemDc,hOldBmp);//获取刚才选入的位图

Win32.DeleteDC(hDc);//删除桌面dc

Win32.DeleteDC(hMemDc);//删除内存dc

Win32.DeleteObject(hOldBmp);//删除位图句柄

returnImage.FromHbitmap(hBmp);//返回位图

}

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