Draw transparent background bitmap

// when blitting from a monochrome DC to a color DC, // the color black in the source turns into the destination's text color, // and the color white in the source turns into the destination's background color. // If you blit from a color DC to a monochrome DC, // then all pixels in the source that are equal to the background color will turn white, and all other pixels will turn black. // In other words, GDI considers a monochrome bitmap to be black pixels on a white background. static void DrawTransBmp( HDC hDst, HBITMAP hImg, COLORREF clrTran ){    COLORREF colorOldFront;    COLORREF colorOldBg;    BITMAP bmp;    GetObject( hImg, sizeof( bmp ), &bmp );    HDC hForeDC = ::CreateCompatibleDC( hDst );::SelectObject ( hForeDC, hImg );    //prepare mask dc    HDC hDCMask = CreateCompatibleDC ( hDst );    // MSDN:    When a memory device context is created, it initially has a 1-by-1 monochrome bitmap selected into it.    //          If this memory device context is used in CreateCompatibleBitmap, the bitmap that is created is a monochrome bitmap.     HBITMAP hBmpMask = CreateCompatibleBitmap( hDCMask, bmp.bmWidth, bmp.bmHeight );::SelectObject ( hDCMask, hBmpMask );    ::SetBkColor( hForeDC, clrTran );                                                //Set clrTran as blackground color    ::BitBlt( hDCMask, 0, 0, bmp.bmWidth, bmp.bmHeight, hForeDC, 0, 0, SRCCOPY );    //monochrome, background color is white    //mask the foreground     ::SetBkColor( hForeDC, RGB(0,0,0) );    ::SetTextColor( hForeDC, RGB(255,255,255) );::BitBlt( hForeDC, 0, 0, bmp.bmWidth, bmp.bmHeight, hDCMask, 0, 0, SRCAND );    //mask the background    colorOldBg = ::SetBkColor( hDst, RGB(255,255,255) );    colorOldFront = ::SetTextColor( hDst, RGB(0,0,0) );::BitBlt( hDst, 0, 0, bmp.bmWidth, bmp.bmHeight, hDCMask, 0, 0, SRCAND );     //or foreground and background::BitBlt( hDst, 0, 0, bmp.bmWidth, bmp.bmHeight, hForeDC, 0, 0, SRCPAINT );    //recover hDst color of background and foreground    ::SetBkColor( hDst, colorOldBg );    ::SetTextColor( hDst, colorOldFront );    //release object    ::DeleteDC( hDCMask );    ::DeleteDC( hForeDC );    ::DeleteObject( hBmpMask );}