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#ifdef _DEBUG
#define new DEBUG_NEW #undef THIS_FILE static char THIS_FILE[] = __FILE__ ; #endif CTransparentImage::CTransparentImage() {} CTransparentImage::~CTransparentImage() {} BEGIN_MESSAGE_MAP( CTransparentImage, CStatic ) //{{AFX_MSG_MAP( CTransparentImage ) ON_WM_PAINT() //}}AFX_MSG_MAP END_MESSAGE_MAP() void CTransparentImage::OnPaint() { HBITMAP l_hbmpBitmap = GetBitmap() ; if( l_hbmpBitmap == NULL ) { Default() ; return ; } CPaintDC l_PaintDC( this ) ; // Prepare everything for drawing CRect l_rcClient ; GetClientRect( &l_rcClient ) ; //Buffer CDC l_BufferDC ; l_BufferDC.CreateCompatibleDC( &l_PaintDC ) ; CBitmap l_BufferBitmap ; l_BufferBitmap.CreateCompatibleBitmap(&l_PaintDC,l_rcClient.Width(), l_rcClient.Height() ) ; CBitmap* l_pOldBufferBitmap = l_BufferDC.SelectObject( &l_BufferBitmap ) ; //Mask CDC l_MaskDC ; l_MaskDC.CreateCompatibleDC( &l_PaintDC ) ; CBitmap l_MaskBitmap ; l_MaskBitmap.CreateBitmap( l_rcClient.Width(), l_rcClient.Height(), 1, 1, NULL ) ; CBitmap* l_pOldMaskBitmap = l_MaskDC.SelectObject( &l_MaskBitmap ) ; #define SRCMASK 0x00220326 // Fill with transparent color l_BufferDC.FillSolidRect( &l_rcClient, RGB( 255, 0, 255 ) ) ; // Blit the bitmap to the buffer CDC l_MemoryDC ; l_MemoryDC.CreateCompatibleDC( &l_PaintDC ) ; CBitmap* l_pOldMemoryBitmap = l_MemoryDC.SelectObject( CBitmap::FromHandle( l_hbmpBitmap ) ) ; l_BufferDC.BitBlt( 0, 0, l_rcClient.Width(), l_rcClient.Height(), &l_MemoryDC,0, 0, SRCCOPY ) ; l_MemoryDC.SelectObject( l_pOldMemoryBitmap ) ; // Create the mask. COLORREF l_crOldBack = l_BufferDC.SetBkColor( RGB( 255, 0, 255 ) ) ; l_MaskDC.BitBlt( 0, 0, l_rcClient.Width(), l_rcClient.Height(), &l_BufferDC,0, 0, SRCCOPY ) ; l_BufferDC.SetBkColor( l_crOldBack ) ; // Draw the bitmap transparently now； if( ! l_PaintDC.MaskBlt( 0, 0, l_rcClient.Width(), l_rcClient.Height(),&l_BufferDC, 0, 0, l_MaskBitmap, 0, 0,ROP4_TRANSPARENTBLIT ) ) { CDC l_CopyDC ; l_CopyDC.CreateCompatibleDC( &l_PaintDC ) ; CBitmap l_CopyBitmap ; l_CopyBitmap.CreateCompatibleBitmap( &l_PaintDC, l_rcClient.Width(),l_rcClient.Height() ) ; CBitmap* l_pOldCopyBitmap = l_CopyDC.SelectObject( &l_CopyBitmap ) ; l_CopyDC.BitBlt( 0, 0, l_rcClient.Width(), l_rcClient.Height(), &l_PaintDC,0, 0, SRCCOPY ) ; l_CopyDC.BitBlt( 0, 0, l_rcClient.Width(), l_rcClient.Height(), &l_MaskDC,0, 0, SRCAND ) ; l_BufferDC.BitBlt( 0, 0, l_rcClient.Width(), l_rcClient.Height(), &l_MaskDC,0, 0, SRCINVERT ) ; l_CopyDC.BitBlt( 0, 0, l_rcClient.Width(), l_rcClient.Height(), &l_BufferDC,0, 0, SRCPAINT ) ; l_PaintDC.BitBlt( 0, 0, l_rcClient.Width(), l_rcClient.Height(), &l_CopyDC,0, 0, SRCCOPY ) ; l_CopyDC.SelectObject( l_pOldCopyBitmap ) ; } // Clean up. l_MaskDC.SelectObject( l_pOldMaskBitmap ) ; l_BufferDC.SelectObject( l_pOldBufferBitmap ) ; } |
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