用MASK方法传送不规则位图

发布: 2007-7-01 20:40 | 作者: admin | 来源: | 查看: 36次 | 进入软件测试论坛讨论

#define    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
    HDC hDC1 = ::CreateCompatibleDC(hdcDest);
    ASSERT ( hDC1 );
    HBITMAP hBitmap2 = ::CreateCompatibleBitmap(hdcDest, nWidth, nHeight);
    HBITMAP hOldBitmap2 = (HBITMAP)::SelectObject(hDC1, hBitmap2);
    ASSERT ( hOldBitmap2 );

    // 2.2 draw dest bitmap and mask
    DWORD dwRop3 = BACK_ROP3(dwRop);
    ::BitBlt(hDC1, 0, 0, nWidth, nHeight, hdcSrc, nXSrc, nYSrc, SRCCOPY);
    ::BitBlt(hDC1, 0, 0, nWidth, nHeight, hdcDest, nXDest, nYDest, dwRop3);
    ::BitBlt(hDC1, 0, 0, nWidth, nHeight, hDCMask, xMask, yMask, DSTERASE);

    // 3. make masked Foreground bitmap

    // 3.1 make bitmap
    HDC hDC2 = ::CreateCompatibleDC(hdcDest);
    ASSERT ( hDC2 );
    HBITMAP hBitmap3 = ::CreateCompatibleBitmap(hdcDest, nWidth, nHeight);
    HBITMAP hOldBitmap3 = (HBITMAP)::SelectObject(hDC2, hBitmap3);
    ASSERT ( hOldBitmap3 );

    // 3.2 draw src bitmap and mask
    dwRop3 = FORE_ROP3(dwRop);
    ::BitBlt(hDC2, 0, 0, nWidth, nHeight, hdcDest, nXDest, nYDest, SRCCOPY);
    ::BitBlt(hDC2, 0, 0, nWidth, nHeight, hdcSrc, nXSrc, nYSrc, dwRop3);
    ::BitBlt(hDC2, 0, 0, nWidth, nHeight, hDCMask, xMask, yMask, SRCAND);

    // 4. combine two bitmap and copy it to hdcDest
    ::BitBlt(hDC1, 0, 0, nWidth, nHeight, hDC2, 0, 0, SRCPAINT);
    ::BitBlt(hdcDest, nXDest, nYDest, nWidth, nHeight, hDC1, 0, 0, SRCCOPY);

    // 5. restore all object
    ::SelectObject(hDCMask, hOldMaskBitmap);
    ::SelectObject(hDC1, hOldBitmap2);
    ::SelectObject(hDC2, hOldBitmap3);

    // 6. delete all temp object
    DeleteObject(hBitmap2);
    DeleteObject(hBitmap3);

    DeleteDC(hDC1);
    DeleteDC(hDC2);
    DeleteDC(hDCMask);

    return TRUE;
}