ddutil.cpp

VC游戏编程基础

    if( FAILED( hr = (*ppSurface)->DrawText( hFont, strText, 0, 0, 
                                             crBackground, crForeground ) ) )
        return hr;

    return S_OK;
}




//-----------------------------------------------------------------------------
// Name: 
// Desc: 
//-----------------------------------------------------------------------------
HRESULT CDisplay::Present()
{
    HRESULT hr;

    if( NULL == m_pddsFrontBuffer && NULL == m_pddsBackBuffer )
        return E_POINTER;

    while( 1 )
    {
        if( m_bWindowed )
            hr = m_pddsFrontBuffer->Blt( &m_rcWindow, m_pddsBackBuffer,
                                         NULL, DDBLT_WAIT, NULL );
        else
            hr = m_pddsFrontBuffer->Flip( NULL, 0 );

        if( hr == DDERR_SURFACELOST )
        {
            m_pddsFrontBuffer->Restore();
            m_pddsBackBuffer->Restore();
        }

        if( hr != DDERR_WASSTILLDRAWING )
            return hr;
    }
}




//-----------------------------------------------------------------------------
// Name: 
// Desc: 
//-----------------------------------------------------------------------------
HRESULT CDisplay::ShowBitmap( HBITMAP hbm, LPDIRECTDRAWPALETTE pPalette )
{
    if( NULL == m_pddsFrontBuffer ||  NULL == m_pddsBackBuffer )
        return E_POINTER;

    // Set the palette before loading the bitmap
    if( pPalette )
        m_pddsFrontBuffer->SetPalette( pPalette );

    CSurface backBuffer;
    backBuffer.Create( m_pddsBackBuffer );

    if( FAILED( backBuffer.DrawBitmap( hbm, 0, 0, 0, 0 ) ) )
        return E_FAIL;

    return Present();
}




//-----------------------------------------------------------------------------
// Name: 
// Desc: 
//-----------------------------------------------------------------------------
HRESULT CDisplay::ColorKeyBlt( DWORD x, DWORD y, LPDIRECTDRAWSURFACE7 pdds,
                               RECT* prc )
{
    if( NULL == m_pddsBackBuffer )
        return E_POINTER;

    return m_pddsBackBuffer->BltFast( x, y, pdds, prc, DDBLTFAST_SRCCOLORKEY );
}




//-----------------------------------------------------------------------------
// Name: 
// Desc: 
//-----------------------------------------------------------------------------
HRESULT CDisplay::Blt( DWORD x, DWORD y, LPDIRECTDRAWSURFACE7 pdds, RECT* prc,
                       DWORD dwFlags )
{
    if( NULL == m_pddsBackBuffer )
        return E_POINTER;

    return m_pddsBackBuffer->BltFast( x, y, pdds, prc, dwFlags );
}




//-----------------------------------------------------------------------------
// Name: 
// Desc: 
//-----------------------------------------------------------------------------
HRESULT CDisplay::Blt( DWORD x, DWORD y, CSurface* pSurface, RECT* prc )
{
    if( NULL == pSurface )
        return E_INVALIDARG;

    if( pSurface->IsColorKeyed() )
        return Blt( x, y, pSurface->GetDDrawSurface(), prc, DDBLTFAST_SRCCOLORKEY );
    else
        return Blt( x, y, pSurface->GetDDrawSurface(), prc, 0L );
}




//-----------------------------------------------------------------------------
// Name: 
// Desc: 
//-----------------------------------------------------------------------------
HRESULT CDisplay::Clear( DWORD dwColor )
{
    if( NULL == m_pddsBackBuffer )
        return E_POINTER;

    // Erase the background
    DDBLTFX ddbltfx;
    ZeroMemory( &ddbltfx, sizeof(ddbltfx) );
    ddbltfx.dwSize      = sizeof(ddbltfx);
    ddbltfx.dwFillColor = dwColor;

    return m_pddsBackBuffer->Blt( NULL, NULL, NULL, DDBLT_COLORFILL, &ddbltfx );
}




//-----------------------------------------------------------------------------
// Name: 
// Desc: 
//-----------------------------------------------------------------------------
HRESULT CDisplay::SetPalette( LPDIRECTDRAWPALETTE pPalette )
{
    if( NULL == m_pddsFrontBuffer )
        return E_POINTER;

    return m_pddsFrontBuffer->SetPalette( pPalette );
}




//-----------------------------------------------------------------------------
// Name: 
// Desc: 
//-----------------------------------------------------------------------------
HRESULT CDisplay::CreatePaletteFromBitmap( LPDIRECTDRAWPALETTE* ppPalette,
                                           const TCHAR* strBMP )
{
    HRSRC             hResource      = NULL;
    RGBQUAD*          pRGB           = NULL;
    BITMAPINFOHEADER* pbi = NULL;
    PALETTEENTRY      aPalette[256];
    HANDLE            hFile = NULL;
    DWORD             iColor;
    DWORD             dwColors;
    BITMAPFILEHEADER  bf;
    BITMAPINFOHEADER  bi;
    DWORD             dwBytesRead;

    if( m_pDD == NULL || strBMP == NULL || ppPalette == NULL )
        return E_INVALIDARG;

    *ppPalette = NULL;

    //  Try to load the bitmap as a resource, if that fails, try it as a file
    hResource = FindResource( NULL, strBMP, RT_BITMAP );
    if( hResource )
    {
        pbi = (LPBITMAPINFOHEADER) LockResource( LoadResource( NULL, hResource ) );       
        if( NULL == pbi )
            return E_FAIL;

        pRGB = (RGBQUAD*) ( (BYTE*) pbi + pbi->biSize );

        // Figure out how many colors there are
        if( pbi == NULL || pbi->biSize < sizeof(BITMAPINFOHEADER) )
            dwColors = 0;
        else if( pbi->biBitCount > 8 )
            dwColors = 0;
        else if( pbi->biClrUsed == 0 )
            dwColors = 1 << pbi->biBitCount;
        else
            dwColors = pbi->biClrUsed;

        //  A DIB color table has its colors stored BGR not RGB
        //  so flip them around.
        for( iColor = 0; iColor < dwColors; iColor++ )
        {
            aPalette[iColor].peRed   = pRGB[iColor].rgbRed;
            aPalette[iColor].peGreen = pRGB[iColor].rgbGreen;
            aPalette[iColor].peBlue  = pRGB[iColor].rgbBlue;
            aPalette[iColor].peFlags = 0;
        }

        return m_pDD->CreatePalette( DDPCAPS_8BIT, aPalette, ppPalette, NULL );
    }

    // Attempt to load bitmap as a file
    hFile = CreateFile( strBMP, GENERIC_READ, 0, NULL, OPEN_EXISTING, 0, NULL );
    if( NULL == hFile )
        return E_FAIL;

    // Read the BITMAPFILEHEADER
    ReadFile( hFile, &bf, sizeof(bf), &dwBytesRead, NULL );
    if( dwBytesRead != sizeof(bf) )
    {
        CloseHandle( hFile );
        return E_FAIL;
    }

    // Read the BITMAPINFOHEADER
    ReadFile( hFile, &bi, sizeof(bi), &dwBytesRead, NULL );
    if( dwBytesRead != sizeof(bi) )
    {
        CloseHandle( hFile );
        return E_FAIL;
    }

    // Read the PALETTEENTRY 
    ReadFile( hFile, aPalette, sizeof(aPalette), &dwBytesRead, NULL );
    if( dwBytesRead != sizeof(aPalette) )
    {
        CloseHandle( hFile );
        return E_FAIL;
    }

    CloseHandle( hFile );

    // Figure out how many colors there are
    if( bi.biSize != sizeof(BITMAPINFOHEADER) )
        dwColors = 0;
    else if (bi.biBitCount > 8)
        dwColors = 0;
    else if (bi.biClrUsed == 0)
        dwColors = 1 << bi.biBitCount;
    else
        dwColors = bi.biClrUsed;

    //  A DIB color table has its colors stored BGR not RGB
    //  so flip them around since DirectDraw uses RGB
    for( iColor = 0; iColor < dwColors; iColor++ )
    {
        BYTE r = aPalette[iColor].peRed;
        aPalette[iColor].peRed  = aPalette[iColor].peBlue;
        aPalette[iColor].peBlue = r;
    }

    return m_pDD->CreatePalette( DDPCAPS_8BIT, aPalette, ppPalette, NULL );
}




//-----------------------------------------------------------------------------
// Name: 
// Desc: 
//-----------------------------------------------------------------------------
HRESULT CDisplay::UpdateBounds()
{
    if( m_bWindowed )
    {
        GetClientRect( m_hWnd, &m_rcWindow );
        ClientToScreen( m_hWnd, (POINT*)&m_rcWindow );
        ClientToScreen( m_hWnd, (POINT*)&m_rcWindow+1 );
    }
    else
    {
        SetRect( &m_rcWindow, 0, 0, GetSystemMetrics(SM_CXSCREEN),
                 GetSystemMetrics(SM_CYSCREEN) );
    }

    return S_OK;
}





//-----------------------------------------------------------------------------
// Name: CDisplay::InitClipper
// Desc: 
//-----------------------------------------------------------------------------
HRESULT CDisplay::InitClipper()
{
    LPDIRECTDRAWCLIPPER pClipper;
    HRESULT hr;

    // Create a clipper when using GDI to draw on the primary surface 
    if( FAILED( hr = m_pDD->CreateClipper( 0, &pClipper, NULL ) ) )
        return hr;

    pClipper->SetHWnd( 0, m_hWnd );

    if( FAILED( hr = m_pddsFrontBuffer->SetClipper( pClipper ) ) )
        return hr;

    // We can release the clipper now since g_pDDSPrimary 
    // now maintains a ref count on the clipper
    SAFE_RELEASE( pClipper );

    return S_OK;
}





//-----------------------------------------------------------------------------
// Name: 
// Desc: 
//-----------------------------------------------------------------------------
CSurface::CSurface()
{
    m_pdds = NULL;
    m_bColorKeyed = NULL;
}




//-----------------------------------------------------------------------------
// Name: 
// Desc: 
//-----------------------------------------------------------------------------
CSurface::~CSurface()
{
    SAFE_RELEASE( m_pdds );
}




//-----------------------------------------------------------------------------
// Name: 
// Desc: 
//-----------------------------------------------------------------------------
HRESULT CSurface::Create( LPDIRECTDRAWSURFACE7 pdds )
{
    m_pdds = pdds;

    if( m_pdds )
    {
        m_pdds->AddRef();

        // Get the DDSURFACEDESC structure for this surface
        m_ddsd.dwSize = sizeof(m_ddsd);
        m_pdds->GetSurfaceDesc( &m_ddsd );
    }

    return S_OK;
}




//-----------------------------------------------------------------------------
// Name: 
// Desc: 
//-----------------------------------------------------------------------------
HRESULT CSurface::Create( LPDIRECTDRAW7 pDD, DDSURFACEDESC2* pddsd )