TransparentBlt的使用

TransparentBlt的使用

  //自定义绘制
  CDC* cdc = GetDC();     //前台DC
  CDC bufferDC;           //后台DC
  CDC tempDC;    //临时DC
  CBitmap bufferBMP;  //后台DC位图
  //DC关联
  bufferDC.CreateCompatibleDC(cdc);
  tempDC.CreateCompatibleDC(cdc);
  //后台DC位图关联       
  bufferBMP.CreateCompatibleBitmap(cdc,278,127);       
  bufferDC.SelectObject(bufferBMP);
  tempDC.SelectObject(m_bmp);
  bufferDC.TransparentBlt(0,0,278,127,&tempDC,0,0,278,127,RGB(255,255,255));
  //绘制到前台DC
  cdc->BitBlt(0,0,278,127,&bufferDC,0,0,SRCCOPY);
  //释放资源
  bufferBMP.DeleteObject();
  tempDC.DeleteDC();
  bufferDC.DeleteDC();
  this->ReleaseDC(cdc);