用MASK方法传送不规则位图

用MASK方法传送不规则位图

e FORE_ROP3(ROP4) (0x00FFFFFF&(ROP4))

#define BACK_ROP3(ROP4) (ROP3FromIndex(SwapROP3_SrcDst(BYTE((ROP4)>>24))))

#define DSTCOPY 0x00AA0029

#define DSTERASE 0x00220326 // dest = dest & (~src) : DSna

BOOL WINAPI MyMaskBlt(HDC hdcDest, int nXDest, int nYDest, int nWidth, int nHeight,

HDC hdcSrc, int nXSrc, int nYSrc,

HBITMAP hbmMask, int xMask, int yMask,

DWORD dwRop

)

{

if ( hbmMask == NULL )

return BitBlt(hdcDest, nXDest, nYDest, nWidth, nHeight, hdcSrc,

nXSrc, nYSrc, FORE_ROP3(dwRop));

// 1. make mask bitmap´s dc

HDC hDCMask = ::CreateCompatibleDC(hdcDest);

HBITMAP hOldMaskBitmap = (HBITMAP)::SelectObject(hDCMask, hbmMask);

ASSERT ( hOldMaskBitmap );

// 2. make masked Background bitmap

// 2.1 make bitmap