vc++2008 绘制透明位图

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/*函数名:绘制透明位图*/void Cs1Dlg::drawTransparent(CBitmap & bmp, int x, int y, int cx, int cy, int srcx, int srcy, CDC * pDC, COLORREF TransparentColor){//定义源，掩码，透明绘制环境CDC SrcDC,MaskDC,TransDC;//定义掩码，透明位图CBitmap MaskBmp,TransBmp;BITMAP bm;//创建源，掩码，透明绘制环境SrcDC.CreateCompatibleDC(pDC);MaskDC.CreateCompatibleDC(pDC);TransDC.CreateCompatibleDC(pDC);//得到位图结构bmp.GetBitmap (&bm);//创建透明位图TransBmp.CreateCompatibleBitmap (pDC,cx,cy);//创建掩码位图MaskBmp.CreateBitmap(cx,cy,1,1,NULL);//将透明位图对象选入到透明绘图环境CBitmap *pTransBmp=TransDC.SelectObject(&TransBmp);TransDC.BitBlt (x,y,cx,cy,pDC,srcx,srcy,SRCCOPY);CBitmap *pSrcBmp=SrcDC.SelectObject (&bmp);SrcDC.SetBkMode (TRANSPARENT);if(TransparentColor){SrcDC.SetBkColor(TransparentColor);}else{COLORREF col =SrcDC.GetPixel (0,bm.bmHeight -1);SrcDC.SetBkColor(col);}CBitmap *pMaskBmp=MaskDC.SelectObject(&MaskBmp);MaskDC.BitBlt(x,y,cx,cy,&SrcDC,0,0,SRCCOPY);TransDC.BitBlt (x,x,cx,cy,&SrcDC,0,0,SRCINVERT);TransDC.BitBlt (x,x,cx,cy,&SrcDC,0,0,SRCAND);TransDC.BitBlt (x,x,cx,cy,&SrcDC,0,0,SRCINVERT);BOOL bRet=pDC->BitBlt (x,y,cx,cy,&TransDC,srcx,srcy,SRCCOPY);SrcDC.SelectObject(pSrcBmp);SrcDC.DeleteDC();TransDC.SelectObject(pTransBmp);TransBmp.DeleteObject ();TransDC.DeleteDC ();MaskDC.SelectObject (pMaskBmp);MaskDC.DeleteDC ();MaskBmp.DeleteObject ();}

调用

CClientDC dc(this);
CBitmap bmp;
bmp.LoadBitmap(IDB_BITMAP1);/* IDB_BITMAP1 */
BITMAP bm;
bmp.GetBitmap (&bm);
drawTransparent (bmp,0,0,bm.bmWidth ,bm.bmHeight ,0,0,&dc,NULL);
bmp.DeleteObject ();