bitmap.cpp

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                *destination++ = ((*data++) * a + 127) / 255 ;
#else
                *destination++ = *data++ ;
                *destination++ = *data++ ;
                *destination++ = *data++ ;
#endif
            }
            else
            {
                *destination++ = 0xFF ;
                *destination++ = *data++ ;
                *destination++ = *data++ ;
                *destination++ = *data++ ;
            }
        }
    }

    EndRawAccess() ;
    if ( image.HasMask() )
        SetMask( new wxMask( *this , wxColour( image.GetMaskRed() , image.GetMaskGreen() , image.GetMaskBlue() ) ) ) ;
}

wxImage wxBitmap::ConvertToImage() const
{
    wxImage image;

    wxCHECK_MSG( Ok(), wxNullImage, wxT("invalid bitmap") );

    // create an wxImage object
    int width = GetWidth();
    int height = GetHeight();
    image.Create( width, height );

    unsigned char *data = image.GetData();
    wxCHECK_MSG( data, wxNullImage, wxT("Could not allocate data for image") );

    unsigned char* source = (unsigned char*) GetRawAccess() ;

    bool hasAlpha = false ;
    bool hasMask = false ;
    int maskBytesPerRow = 0 ;
    unsigned char *alpha = NULL ;
    unsigned char *mask = NULL ;

    if ( HasAlpha() )
        hasAlpha = true ;

    if ( GetMask() )
    {
        hasMask = true ;
        mask = (unsigned char*) GetMask()->GetRawAccess() ;
        maskBytesPerRow = GetMask()->GetBytesPerRow() ;
    }

    if ( hasAlpha )
    {
        image.SetAlpha() ;
        alpha = image.GetAlpha() ;
    }

    int index = 0;

    // The following masking algorithm is the same as well in msw/gtk:
    // the colour used as transparent one in wxImage and the one it is
    // replaced with when it actually occurs in the bitmap
    static const int MASK_RED = 1;
    static const int MASK_GREEN = 2;
    static const int MASK_BLUE = 3;
    static const int MASK_BLUE_REPLACEMENT = 2;

    for (int yy = 0; yy < height; yy++ , mask += maskBytesPerRow )
    {
        unsigned char * maskp = mask ;
        unsigned char a, r, g, b;
        long color;

        for (int xx = 0; xx < width; xx++)
        {
            color = *((long*) source) ;
#ifdef WORDS_BIGENDIAN
            a = ((color&0xFF000000) >> 24) ;
            r = ((color&0x00FF0000) >> 16) ;
            g = ((color&0x0000FF00) >> 8) ;
            b = (color&0x000000FF);
#else
            b = ((color&0xFF000000) >> 24) ;
            g = ((color&0x00FF0000) >> 16) ;
            r = ((color&0x0000FF00) >> 8) ;
            a = (color&0x000000FF);
#endif
            if ( hasMask )
            {
                if ( *maskp++ == 0xFF )
                {
                    r = MASK_RED ;
                    g = MASK_GREEN ;
                    b = MASK_BLUE ;
                }
                else if ( r == MASK_RED && g == MASK_GREEN && b == MASK_BLUE )
                    b = MASK_BLUE_REPLACEMENT ;

                maskp++ ;
                maskp++ ;
                maskp++ ;
            }
            else if ( hasAlpha )
                *alpha++ = a ;

            data[index    ] = r ;
            data[index + 1] = g ;
            data[index + 2] = b ;

            index += 3;
            source += 4 ;
        }
    }

    if ( hasMask )
        image.SetMaskColour( MASK_RED, MASK_GREEN, MASK_BLUE );

    return image;
}

#endif //wxUSE_IMAGE

bool wxBitmap::SaveFile( const wxString& filename,
    wxBitmapType type, const wxPalette *palette ) const
{
    bool success = false;
    wxBitmapHandler *handler = FindHandler(type);

    if ( handler )
    {
        success = handler->SaveFile(this, filename, type, palette);
    }
    else
    {
#if wxUSE_IMAGE
        wxImage image = ConvertToImage();
        success = image.SaveFile(filename, type);
#else
        wxLogWarning(wxT("no bitmap handler for type %d defined."), type);
#endif
    }

    return success;
}

bool wxBitmap::IsOk() const
{
   return (M_BITMAPDATA && M_BITMAPDATA->Ok());
}

int wxBitmap::GetHeight() const
{
   wxCHECK_MSG( Ok(), -1, wxT("invalid bitmap") );

   return M_BITMAPDATA->GetHeight();
}

int wxBitmap::GetWidth() const
{
   wxCHECK_MSG( Ok(), -1, wxT("invalid bitmap") );

   return M_BITMAPDATA->GetWidth() ;
}

int wxBitmap::GetDepth() const
{
   wxCHECK_MSG( Ok(), -1, wxT("invalid bitmap") );

   return M_BITMAPDATA->GetDepth();
}

#if WXWIN_COMPATIBILITY_2_4
int wxBitmap::GetQuality() const
{
    return 0;
}

void wxBitmap::SetQuality(int WXUNUSED(quality))
{
}
#endif

wxMask *wxBitmap::GetMask() const
{
   wxCHECK_MSG( Ok(), (wxMask *) NULL, wxT("invalid bitmap") );

   return M_BITMAPDATA->m_bitmapMask;
}

bool wxBitmap::HasAlpha() const
{
   wxCHECK_MSG( Ok(), false , wxT("invalid bitmap") );

   return M_BITMAPDATA->HasAlpha() ;
}

void wxBitmap::SetWidth(int w)
{
    AllocExclusive();
    M_BITMAPDATA->SetWidth(w);
}

void wxBitmap::SetHeight(int h)
{
    AllocExclusive();
    M_BITMAPDATA->SetHeight(h);
}

void wxBitmap::SetDepth(int d)
{
    AllocExclusive();
    M_BITMAPDATA->SetDepth(d);
}

void wxBitmap::SetOk(bool isOk)
{
    AllocExclusive();
    M_BITMAPDATA->SetOk(isOk);
}

#if wxUSE_PALETTE
wxPalette *wxBitmap::GetPalette() const
{
   wxCHECK_MSG( Ok(), NULL, wxT("Invalid bitmap  GetPalette()") );

   return &M_BITMAPDATA->m_bitmapPalette;
}

void wxBitmap::SetPalette(const wxPalette& palette)
{
    AllocExclusive();
    M_BITMAPDATA->m_bitmapPalette = palette ;
}
#endif // wxUSE_PALETTE

void wxBitmap::SetMask(wxMask *mask)
{
    AllocExclusive();
    // Remove existing mask if there is one.
    delete M_BITMAPDATA->m_bitmapMask;

    M_BITMAPDATA->m_bitmapMask = mask ;
}

WXHBITMAP wxBitmap::GetHBITMAP(WXHBITMAP* mask) const
{
    return WXHBITMAP(M_BITMAPDATA->GetHBITMAP((GWorldPtr*)mask));
}

// ----------------------------------------------------------------------------
// wxMask
// ----------------------------------------------------------------------------

wxMask::wxMask()
{
    Init() ;
}

wxMask::wxMask(const wxMask &tocopy)
{
    Init();

    m_bytesPerRow = tocopy.m_bytesPerRow;
    m_width = tocopy.m_width;
    m_height = tocopy.m_height;

    size_t size = m_bytesPerRow * m_height;
    unsigned char* dest = (unsigned char*)m_memBuf.GetWriteBuf( size );
    unsigned char* source = (unsigned char*)tocopy.m_memBuf.GetData();
    for (size_t i=0; i<size; i++)
    {
        *dest++ = *source++;
    }

    m_memBuf.UngetWriteBuf( size ) ;
    RealizeNative() ;
}

// Construct a mask from a bitmap and a colour indicating
// the transparent area
wxMask::wxMask( const wxBitmap& bitmap, const wxColour& colour )
{
    Init() ;
    Create( bitmap, colour );
}

// Construct a mask from a mono bitmap (copies the bitmap).
wxMask::wxMask( const wxBitmap& bitmap )
{
    Init() ;
    Create( bitmap );
}

// Construct a mask from a mono bitmap (copies the bitmap).

wxMask::wxMask( const wxMemoryBuffer& data, int width , int height , int bytesPerRow )
{
    Init() ;
    Create( data, width , height , bytesPerRow );
}

wxMask::~wxMask()
{
#ifndef __LP64__
    if ( m_maskBitmap )
    {
        DisposeGWorld( (GWorldPtr)m_maskBitmap ) ;
        m_maskBitmap = NULL ;
    }
#endif
}

void wxMask::Init()
{
    m_width = m_height = m_bytesPerRow = 0 ;
    m_maskBitmap = NULL ;
}

void *wxMask::GetRawAccess() const
{
    return m_memBuf.GetData() ;
}

// The default ColorTable for k8IndexedGrayPixelFormat in Intel appears to be broken, so we'll use an non-indexed
// bitmap mask instead; in order to keep the code simple, the change applies to PowerPC implementations as well

void wxMask::RealizeNative()
{
#ifndef __LP64__
    if ( m_maskBitmap )
    {
       DisposeGWorld( (GWorldPtr)m_maskBitmap ) ;
       m_maskBitmap = NULL ;
    }

    Rect rect = { 0 , 0 , m_height , m_width } ;

    OSStatus err = NewGWorldFromPtr(
        (GWorldPtr*) &m_maskBitmap , k32ARGBPixelFormat , &rect , NULL , NULL , 0 ,
        (char*) m_memBuf.GetData() , m_bytesPerRow ) ;
    verify_noerr( err ) ;
#endif
}

// Create a mask from a mono bitmap (copies the bitmap).

bool wxMask::Create(const wxMemoryBuffer& data,int width , int height , int bytesPerRow)
{
    m_memBuf = data ;
    m_width = width ;
    m_height = height ;
    m_bytesPerRow = bytesPerRow ;

    wxASSERT( data.GetDataLen() == (size_t)(height * bytesPerRow) ) ;

    RealizeNative() ;

    return true ;
}

// Create a mask from a mono bitmap (copies the bitmap).
bool wxMask::Create(const wxBitmap& bitmap)
{
    m_width = bitmap.GetWidth() ;
    m_height = bitmap.GetHeight() ;
    m_bytesPerRow = ( m_width * 4 + 3 ) & 0xFFFFFFC ;

    size_t size = m_bytesPerRow * m_height ;
    unsigned char * destdatabase = (unsigned char*) m_memBuf.GetWriteBuf( size ) ;
    wxASSERT( destdatabase != NULL ) ;

    memset( destdatabase , 0 , size ) ;
    unsigned char * srcdata = (unsigned char*) bitmap.GetRawAccess() ;

    for ( int y = 0 ; y < m_height ; ++y , destdatabase += m_bytesPerRow )
    {
        unsigned char *destdata = destdatabase ;
        unsigned char r, g, b;

        for ( int x = 0 ; x < m_width ; ++x )
        {
            srcdata++ ;
            r = *srcdata++ ;
            g = *srcdata++ ;
            b = *srcdata++ ;

            if ( ( r + g + b ) > 0x10 )
            {
                *destdata++ = 0xFF ;
                *destdata++ = 0xFF ;
                *destdata++ = 0xFF ;
                *destdata++ = 0xFF ;
            }
            else
            {
                *destdata++ = 0x00 ;
                *destdata++ = 0x00 ;
                *destdata++ = 0x00 ;
                *destdata++ = 0x00 ;
            }
        }
    }

    m_memBuf.UngetWriteBuf( size ) ;
    RealizeNative() ;

    return true;
}

// Create a mask from a bitmap and a colour indicating
// the transparent area
bool wxMask::Create(const wxBitmap& bitmap, const wxColour& colour)
{
    m_width = bitmap.GetWidth() ;
    m_height = bitmap.GetHeight() ;
    m_bytesPerRow = ( m_width * 4 + 3 ) & 0xFFFFFFC ;

    size_t size = m_bytesPerRow * m_height ;
    unsigned char * destdatabase = (unsigned char*) m_memBuf.GetWriteBuf( size ) ;
    wxASSERT( destdatabase != NULL ) ;

    memset( destdatabase , 0 , size ) ;
    unsigned char * srcdata = (unsigned char*) bitmap.GetRawAccess() ;

    for ( int y = 0 ; y < m_height ; ++y , destdatabase += m_bytesPerRow)
    {
        unsigned char *destdata = destdatabase ;
        unsigned char r, g, b;

        for ( int x = 0 ; x < m_width ; ++x )
        {
            srcdata++ ;
            r = *srcdata++ ;
            g = *srcdata++ ;
            b = *srcdata++ ;

            if ( colour == wxColour( r , g , b ) )
            {
                *destdata++ = 0xFF ;
                *destdata++ = 0xFF ;
                *destdata++ = 0xFF ;
                *destdata++ = 0xFF ;
            }
            else
            {
                *destdata++ = 0x00 ;
                *destdata++ = 0x00 ;
                *destdata++ = 0x00 ;
                *destdata++ = 0x00 ;
            }
        }
    }

    m_memBuf.UngetWriteBuf( size ) ;
    RealizeNative() ;

    return true;
}

WXHBITMAP wxMask::GetHBITMAP() const
{
    return m_maskBitmap ;
}

// ----------------------------------------------------------------------------
// wxBitmapHandler
// ----------------------------------------------------------------------------

IMPLEMENT_ABSTRACT_CLASS(wxBitmapHandler, wxBitmapHandlerBase)

// ----------------------------------------------------------------------------
// Standard Handlers
// ----------------------------------------------------------------------------

class WXDLLEXPORT wxPICTResourceHandler: public wxBitmapHandler
{
    DECLARE_DYNAMIC_CLASS(wxPICTResourceHandler)

public:
    inline wxPICTResourceHandler()
    {
        SetName(wxT("Macintosh Pict resource"));
        SetExtension(wxEmptyString);
        SetType(wxBITMAP_TYPE_PICT_RESOURCE);
    };

    virtual bool LoadFile(wxBitmap *bitmap, const wxString& name, long flags,
          int desiredWidth, int desiredHeight);
};

IMPLEMENT_DYNAMIC_CLASS(wxPICTResourceHandler, wxBitmapHandler)


bool wxPICTResourceHandler::LoadFile(wxBitmap *bitmap, const wxString& name, long flags,
          int desiredWidth, int desiredHeight)
{
#if wxUSE_METAFILE
    Str255 theName ;
    wxMacStringToPascal( name , theName ) ;

    PicHandle thePict = (PicHandle ) GetNamedResource( 'PICT' , theName ) ;
    if ( thePict )
    {
        wxMetafile mf ;

        mf.SetHMETAFILE( (WXHMETAFILE) thePict ) ;
        bitmap->Create( mf.GetWidth() , mf.GetHeight() ) ;
        wxMemoryDC dc ;
        dc.SelectObject( *bitmap ) ;
        mf.Play( &dc ) ;
        dc.SelectObject( wxNullBitmap ) ;

        return true ;
    }
#endif

    return false ;
}

void wxBitmap::InitStandardHandlers()
{
    AddHandler( new wxPICTResourceHandler ) ;
    AddHandler( new wxICONResourceHandler ) ;
}

// ----------------------------------------------------------------------------
// raw bitmap access support
// ----------------------------------------------------------------------------

void *wxBitmap::GetRawData(wxPixelDataBase& data, int bpp)
{
    if ( !Ok() )
        // no bitmap, no data (raw or otherwise)
        return NULL;

    data.m_width = GetWidth() ;
    data.m_height = GetHeight() ;
    data.m_stride = GetWidth() * 4 ;

    return BeginRawAccess() ;
}

void wxBitmap::UngetRawData(wxPixelDataBase& dataBase)
{
    EndRawAccess() ;
}

void wxBitmap::UseAlpha()
{
    // remember that we are using alpha channel:
    // we'll need to create a proper mask in UngetRawData()
    M_BITMAPDATA->UseAlpha( true );
}