[wxWidgets.git] / src / osx / core / bitmap.cpp

/////////////////////////////////////////////////////////////////////////////
// Name:        src/osx/core/bitmap.cpp
// Purpose:     wxBitmap
// Author:      Stefan Csomor
// Modified by:
// Created:     1998-01-01
// RCS-ID:      $Id$
// Copyright:   (c) Stefan Csomor
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

#include "wx/wxprec.h"

#include "wx/bitmap.h"

#ifndef WX_PRECOMP
    #include "wx/log.h"
    #include "wx/dcmemory.h"
    #include "wx/icon.h"
    #include "wx/image.h"
#endif

#include "wx/metafile.h"
#include "wx/xpmdecod.h"

#include "wx/rawbmp.h"

IMPLEMENT_DYNAMIC_CLASS(wxBitmap, wxGDIObject)
IMPLEMENT_DYNAMIC_CLASS(wxMask, wxObject)

#if wxOSX_USE_CARBON
#include "wx/osx/uma.h"
#else
#include "wx/osx/private.h"
#endif

#ifndef __WXOSX_IPHONE__
#include <QuickTime/QuickTime.h>
#endif

CGColorSpaceRef wxMacGetGenericRGBColorSpace();
CGDataProviderRef wxMacCGDataProviderCreateWithMemoryBuffer( const wxMemoryBuffer& buf );

// Implementation Notes
// --------------------
//
// we are always working with a 32 bit deep pixel buffer
// under QuickDraw its alpha parts are going to be ignored in the GWorld,
// therefore we have a separate GWorld there for blitting the mask in

// under Quartz then content is transformed into a CGImageRef representing the same data
// which can be transferred to the GPU by the OS for fast rendering

class WXDLLEXPORT wxBitmapRefData: public wxGDIRefData
{
    friend class WXDLLIMPEXP_FWD_CORE wxIcon;
    friend class WXDLLIMPEXP_FWD_CORE wxCursor;
public:
    wxBitmapRefData(int width , int height , int depth);
    wxBitmapRefData(CGImageRef image);
    wxBitmapRefData();
    wxBitmapRefData(const wxBitmapRefData &tocopy);

    virtual ~wxBitmapRefData();

    virtual bool IsOk() const { return m_ok; }

    void Free();
    void SetOk( bool isOk) { m_ok = isOk; }

    void SetWidth( int width ) { m_width = width; }
    void SetHeight( int height ) { m_height = height; }
    void SetDepth( int depth ) { m_depth = depth; }

    int GetWidth() const { return m_width; }
    int GetHeight() const { return m_height; }
    int GetDepth() const { return m_depth; }

    void *GetRawAccess() const;
    void *BeginRawAccess();
    void EndRawAccess();

    bool HasAlpha() const { return m_hasAlpha; }
    void UseAlpha( bool useAlpha );

public:
#if wxUSE_PALETTE
    wxPalette     m_bitmapPalette;
#endif // wxUSE_PALETTE

    wxMask *      m_bitmapMask; // Optional mask
    CGImageRef    CreateCGImage() const;

    // returns true if the bitmap has a size that
    // can be natively transferred into a true icon
    // if no is returned GetIconRef will still produce
    // an icon but it will be generated via a PICT and
    // rescaled to 16 x 16
    bool          HasNativeSize();

    // caller should increase ref count if needed longer
    // than the bitmap exists
    IconRef       GetIconRef();

#ifndef __WXOSX_IPHONE__
    // returns a Pict from the bitmap content
    PicHandle     GetPictHandle();
#endif

    CGContextRef  GetBitmapContext() const;

    int           GetBytesPerRow() const { return m_bytesPerRow; }
    private :
    bool Create(int width , int height , int depth);
    bool Create( CGImageRef image );
    void Init();

    int           m_width;
    int           m_height;
    int           m_bytesPerRow;
    int           m_depth;
    bool          m_hasAlpha;
    wxMemoryBuffer m_memBuf;
    int           m_rawAccessCount;
    bool          m_ok;
    mutable CGImageRef    m_cgImageRef;

    IconRef       m_iconRef;
#ifndef __WXOSX_IPHONE__
    PicHandle     m_pictHandle;
#endif
    CGContextRef  m_hBitmap;
};


#define wxOSX_USE_PREMULTIPLIED_ALPHA 1
static const int kBestByteAlignement = 16;
static const int kMaskBytesPerPixel = 1;

static int GetBestBytesPerRow( int rawBytes )
{
    return (((rawBytes)+kBestByteAlignement-1) & ~(kBestByteAlignement-1) );
}

#if wxUSE_GUI && !defined(__WXOSX_IPHONE__)

// this is used for more controls than just the wxBitmap button, also for notebooks etc

void wxMacCreateBitmapButton( ControlButtonContentInfo*info , const wxBitmap& bitmap , int forceType )
{
    memset( info , 0 , sizeof(ControlButtonContentInfo) ) ;
    if ( bitmap.IsOk() )
    {
        wxBitmapRefData * bmap = bitmap.GetBitmapData() ;
        if ( bmap == NULL )
            return ;

        if ( forceType == 0  )
        {
            forceType = kControlContentCGImageRef;
        }

        if ( forceType == kControlContentIconRef )
        {
            wxBitmap scaleBmp ;
            wxBitmapRefData* bmp = bmap ;

            if ( !bmap->HasNativeSize() )
            {
                // as PICT conversion will only result in a 16x16 icon, let's attempt
                // a few scales for better results

                int w = bitmap.GetWidth() ;
                int h = bitmap.GetHeight() ;
                int sz = wxMax( w , h ) ;
                if ( sz == 24 || sz == 64 )
                {
                    scaleBmp = wxBitmap( bitmap.ConvertToImage().Scale( w * 2 , h * 2 ) ) ;
                    bmp = scaleBmp.GetBitmapData() ;
                }
            }

            info->contentType = kControlContentIconRef ;
            info->u.iconRef = bmp->GetIconRef() ;
            AcquireIconRef( info->u.iconRef ) ;
        }
        else if ( forceType == kControlContentCGImageRef )
        {
            info->contentType = kControlContentCGImageRef ;
            info->u.imageRef = (CGImageRef) bmap->CreateCGImage() ;
        }
        else
        {
#ifndef __LP64__
            info->contentType = kControlContentPictHandle ;
            info->u.picture = bmap->GetPictHandle() ;
#endif
        }
    }
}

CGImageRef wxMacCreateCGImageFromBitmap( const wxBitmap& bitmap )
{
    wxBitmapRefData * bmap = bitmap.GetBitmapData() ;
    if ( bmap == NULL )
        return NULL ;
    return (CGImageRef) bmap->CreateCGImage();
}

void wxMacReleaseBitmapButton( ControlButtonContentInfo*info )
{
    if ( info->contentType == kControlContentIconRef )
    {
        ReleaseIconRef( info->u.iconRef ) ;
    }
    else if ( info->contentType == kControlNoContent )
    {
        // there's no bitmap at all, fall through silently
    }
    else if ( info->contentType == kControlContentPictHandle )
    {
        // owned by the bitmap, no release here
    }
    else if ( info->contentType == kControlContentCGImageRef )
    {
        CGImageRelease( info->u.imageRef ) ;
    }
    else
    {
        wxFAIL_MSG(wxT("Unexpected bitmap type") ) ;
    }
}

#endif //wxUSE_BMPBUTTON

#define M_BITMAPDATA ((wxBitmapRefData *)m_refData)

void wxBitmapRefData::Init()
{
    m_width = 0 ;
    m_height = 0 ;
    m_depth = 0 ;
    m_bytesPerRow = 0;
    m_ok = false ;
    m_bitmapMask = NULL ;
    m_cgImageRef = NULL ;

#ifndef __WXOSX_IPHONE__
    m_iconRef = NULL ;
    m_pictHandle = NULL ;
#endif
    m_hBitmap = NULL ;

    m_rawAccessCount = 0 ;
    m_hasAlpha = false;
}

wxBitmapRefData::wxBitmapRefData(const wxBitmapRefData &tocopy) : wxGDIRefData()
{
    Init();
    Create(tocopy.m_width, tocopy.m_height, tocopy.m_depth);

    if (tocopy.m_bitmapMask)
        m_bitmapMask = new wxMask(*tocopy.m_bitmapMask);
    else if (tocopy.m_hasAlpha)
        UseAlpha(true);

    unsigned char* dest = (unsigned char*)GetRawAccess();
    unsigned char* source = (unsigned char*)tocopy.GetRawAccess();
    size_t numbytes = m_bytesPerRow * m_height;
    memcpy( dest, source, numbytes );
}

wxBitmapRefData::wxBitmapRefData()
{
    Init() ;
}

wxBitmapRefData::wxBitmapRefData( int w , int h , int d )
{
    Init() ;
    Create( w , h , d ) ;
}

wxBitmapRefData::wxBitmapRefData(CGImageRef image)
{
    Init();
    Create( image );
}    
// code from Technical Q&A QA1509

bool wxBitmapRefData::Create(CGImageRef image)
{
    if ( image != NULL )
    {
        m_width = CGImageGetWidth(image);
        m_height = CGImageGetHeight(image);
        m_depth = 32;
        m_hBitmap = NULL;
        
        m_bytesPerRow = GetBestBytesPerRow( m_width * 4 ) ;
        size_t size = m_bytesPerRow * m_height ;
        void* data = m_memBuf.GetWriteBuf( size ) ;
        if ( data != NULL )
        {
            memset( data , 0 , size ) ;
            m_memBuf.UngetWriteBuf( size ) ;
            CGImageAlphaInfo alpha = CGImageGetAlphaInfo(image);
            if ( alpha == kCGImageAlphaNone || alpha == kCGImageAlphaNoneSkipLast || alpha == kCGImageAlphaNoneSkipLast )
            {
                m_hBitmap = CGBitmapContextCreate((char*) data, m_width, m_height, 8, m_bytesPerRow, wxMacGetGenericRGBColorSpace(), kCGImageAlphaNoneSkipFirst );
            }
            else 
            {
                m_hasAlpha = true;
                m_hBitmap = CGBitmapContextCreate((char*) data, m_width, m_height, 8, m_bytesPerRow, wxMacGetGenericRGBColorSpace(), kCGImageAlphaPremultipliedFirst );
            }
            CGRect rect = {{0,0},{m_width,m_height}}; 
            CGContextDrawImage(m_hBitmap, rect, image);
            
            wxASSERT_MSG( m_hBitmap , wxT("Unable to create CGBitmapContext context") ) ;
            CGContextTranslateCTM( m_hBitmap, 0,  m_height );
            CGContextScaleCTM( m_hBitmap, 1, -1 );
        } /* data != NULL */
    }
    m_ok = ( m_hBitmap != NULL ) ;
    
    return m_ok ;
    
}

bool wxBitmapRefData::Create( int w , int h , int d )
{
    m_width = wxMax(1, w);
    m_height = wxMax(1, h);
    m_depth = d ;
    m_hBitmap = NULL ;

    m_bytesPerRow = GetBestBytesPerRow( m_width * 4 ) ;
    size_t size = m_bytesPerRow * m_height ;
    void* data = m_memBuf.GetWriteBuf( size ) ;
    if ( data != NULL )
    {
        memset( data , 0 , size ) ;
        m_memBuf.UngetWriteBuf( size ) ;

        m_hBitmap = CGBitmapContextCreate((char*) data, m_width, m_height, 8, m_bytesPerRow, wxMacGetGenericRGBColorSpace(), kCGImageAlphaNoneSkipFirst );
        wxASSERT_MSG( m_hBitmap , wxT("Unable to create CGBitmapContext context") ) ;
        CGContextTranslateCTM( m_hBitmap, 0,  m_height );
        CGContextScaleCTM( m_hBitmap, 1, -1 );
    } /* data != NULL */
    m_ok = ( m_hBitmap != NULL ) ;

    return m_ok ;
}

void wxBitmapRefData::UseAlpha( bool use )
{
    if ( m_hasAlpha == use )
        return ;

    m_hasAlpha = use ;

    CGContextRelease( m_hBitmap );
    m_hBitmap = CGBitmapContextCreate((char*) m_memBuf.GetData(), m_width, m_height, 8, m_bytesPerRow, wxMacGetGenericRGBColorSpace(), m_hasAlpha ? kCGImageAlphaPremultipliedFirst : kCGImageAlphaNoneSkipFirst );
    wxASSERT_MSG( m_hBitmap , wxT("Unable to create CGBitmapContext context") ) ;
    CGContextTranslateCTM( m_hBitmap, 0,  m_height );
    CGContextScaleCTM( m_hBitmap, 1, -1 );
}

void *wxBitmapRefData::GetRawAccess() const
{
    wxCHECK_MSG( IsOk(), NULL , wxT("invalid bitmap") ) ;
    return m_memBuf.GetData() ;
}

void *wxBitmapRefData::BeginRawAccess()
{
    wxCHECK_MSG( IsOk(), NULL, wxT("invalid bitmap") ) ;
    wxASSERT( m_rawAccessCount == 0 ) ;
#ifndef __WXOSX_IPHONE__
    wxASSERT_MSG( m_pictHandle == NULL && m_iconRef == NULL ,
        wxT("Currently, modifing bitmaps that are used in controls already is not supported") ) ;
#endif
    ++m_rawAccessCount ;

    // we must destroy an existing cached image, as
    // the bitmap data may change now
    if ( m_cgImageRef )
    {
        CGImageRelease( m_cgImageRef ) ;
        m_cgImageRef = NULL ;
    }

    return m_memBuf.GetData() ;
}

void wxBitmapRefData::EndRawAccess()
{
    wxCHECK_RET( IsOk() , wxT("invalid bitmap") ) ;
    wxASSERT( m_rawAccessCount == 1 ) ;

    --m_rawAccessCount ;
}

bool wxBitmapRefData::HasNativeSize()
{
    int w = GetWidth() ;
    int h = GetHeight() ;
    int sz = wxMax( w , h ) ;

    return ( sz == 128 || sz == 48 || sz == 32 || sz == 16 );
}

#ifndef __WXOSX_IPHONE__
IconRef wxBitmapRefData::GetIconRef()
{
    if ( m_iconRef == NULL )
    {
        // Create Icon Family Handle

        IconFamilyHandle iconFamily = (IconFamilyHandle) NewHandle( 0 );

        int w = GetWidth() ;
        int h = GetHeight() ;
        int sz = wxMax( w , h ) ;

        OSType dataType = 0 ;
        OSType maskType = 0 ;

        switch (sz)
        {
            case 128:
#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5
                if ( UMAGetSystemVersion() >= 0x1050 )
                {
                    dataType = kIconServices128PixelDataARGB ;
                }
                else
#endif
                {
                    dataType = kThumbnail32BitData ;
                    maskType = kThumbnail8BitMask ;
                }
                break;

            case 48:
#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5
                if ( UMAGetSystemVersion() >= 0x1050 )
                {
                    dataType = kIconServices48PixelDataARGB ;
                }
                else
#endif
                {
                    dataType = kHuge32BitData ;
                    maskType = kHuge8BitMask ;
                }
                break;

            case 32:
#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5
                if ( UMAGetSystemVersion() >= 0x1050 )
                {
                    dataType = kIconServices32PixelDataARGB ;
                }
                else
#endif
                {
                    dataType = kLarge32BitData ;
                    maskType = kLarge8BitMask ;
                }
                break;

            case 16:
#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5
                if ( UMAGetSystemVersion() >= 0x1050 )
                {
                    dataType = kIconServices16PixelDataARGB ;
                }
                else
#endif
                {
                    dataType = kSmall32BitData ;
                    maskType = kSmall8BitMask ;
                }
                break;

            default:
                break;
        }

        if ( dataType != 0 )
        {
#if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5
            if (  maskType == 0 && UMAGetSystemVersion() >= 0x1050 )
            {
                size_t datasize = sz * sz * 4 ;
                Handle data = NewHandle( datasize ) ;
                HLock( data ) ;
                unsigned char* ptr = (unsigned char*) *data ;
                memset( ptr, 0, datasize );
                bool hasAlpha = HasAlpha() ;
                wxMask *mask = m_bitmapMask ;
                unsigned char * sourcePtr = (unsigned char*) GetRawAccess() ;
                unsigned char * masksourcePtr = mask ? (unsigned char*) mask->GetRawAccess() : NULL ;

                for ( int y = 0 ; y < h ; ++y, sourcePtr += m_bytesPerRow , masksourcePtr += mask ? mask->GetBytesPerRow() : 0 )
                {
                    unsigned char * source = sourcePtr;
                    unsigned char * masksource = masksourcePtr;
                    unsigned char * dest = ptr + y * sz * 4 ;
                    unsigned char a, r, g, b;

                    for ( int x = 0 ; x < w ; ++x )
                    {
                        a = *source ++ ;
                        r = *source ++ ;
                        g = *source ++ ;
                        b = *source ++ ;

                        if ( mask )
                        {
                            a = 0xFF - *masksource++ ;
                        }
                        else if ( !hasAlpha )
                            a = 0xFF ;
                        else
                        {
#if wxOSX_USE_PREMULTIPLIED_ALPHA
                            // this must be non-premultiplied data
                            if ( a != 0xFF && a!= 0 )
                            {
                                r = r * 255 / a;
                                g = g * 255 / a;
                                b = b * 255 / a;
                            }
#endif
                        }
                        *dest++ = a ;
                        *dest++ = r ;
                        *dest++ = g ;
                        *dest++ = b ;

                     }
                }
                HUnlock( data );

                OSStatus err = SetIconFamilyData( iconFamily, dataType , data );
                if ( err != noErr )
                {
                    wxFAIL_MSG("Error when adding bitmap");
                }

                DisposeHandle( data );
            }
            else
#endif
            {
                // setup the header properly

                Handle data = NULL ;
                Handle maskdata = NULL ;
                unsigned char * maskptr = NULL ;
                unsigned char * ptr = NULL ;
                size_t datasize, masksize ;

                datasize = sz * sz * 4 ;
                data = NewHandle( datasize ) ;
                HLock( data ) ;
                ptr = (unsigned char*) *data ;
                memset( ptr , 0, datasize ) ;

                masksize = sz * sz ;
                maskdata = NewHandle( masksize ) ;
                HLock( maskdata ) ;
                maskptr = (unsigned char*) *maskdata ;
                memset( maskptr , 0 , masksize ) ;

                bool hasAlpha = HasAlpha() ;
                wxMask *mask = m_bitmapMask ;
                unsigned char * sourcePtr = (unsigned char*) GetRawAccess() ;
                unsigned char * masksourcePtr = mask ? (unsigned char*) mask->GetRawAccess() : NULL ;

                for ( int y = 0 ; y < h ; ++y, sourcePtr += m_bytesPerRow , masksourcePtr += mask ? mask->GetBytesPerRow() : 0 )
                {
                    unsigned char * source = sourcePtr;
                    unsigned char * masksource = masksourcePtr;
                    unsigned char * dest = ptr + y * sz * 4 ;
                    unsigned char * maskdest = maskptr + y * sz ;
                    unsigned char a, r, g, b;

                    for ( int x = 0 ; x < w ; ++x )
                    {
                        a = *source ++ ;
                        r = *source ++ ;
                        g = *source ++ ;
                        b = *source ++ ;

                        *dest++ = 0 ;
                        *dest++ = r ;
                        *dest++ = g ;
                        *dest++ = b ;

                        if ( mask )
                            *maskdest++ = 0xFF - *masksource++ ;
                        else if ( hasAlpha )
                            *maskdest++ = a ;
                        else
                            *maskdest++ = 0xFF ;
                    }
                }

                OSStatus err = SetIconFamilyData( iconFamily, dataType , data ) ;
                wxASSERT_MSG( err == noErr , wxT("Error when adding bitmap") ) ;

                err = SetIconFamilyData( iconFamily, maskType , maskdata ) ;
                wxASSERT_MSG( err == noErr , wxT("Error when adding mask") ) ;

                HUnlock( data ) ;
                HUnlock( maskdata ) ;
                DisposeHandle( data ) ;
                DisposeHandle( maskdata ) ;
            }
        }
        else
        {
            PicHandle pic = GetPictHandle() ;
            SetIconFamilyData( iconFamily, 'PICT' , (Handle) pic ) ;
        }
        // transform into IconRef

        // cleaner version existing from 10.3 upwards
        HLock((Handle) iconFamily);
        OSStatus err = GetIconRefFromIconFamilyPtr( *iconFamily, GetHandleSize((Handle) iconFamily), &m_iconRef );
        HUnlock((Handle) iconFamily);
        DisposeHandle( (Handle) iconFamily ) ;

        wxCHECK_MSG( err == noErr, NULL, wxT("Error when constructing icon ref") );
    }

    return m_iconRef ;
}

PicHandle wxBitmapRefData::GetPictHandle()
{
    if ( m_pictHandle == NULL )
    {
#ifndef __LP64__
        GraphicsExportComponent exporter = 0;
        OSStatus err = OpenADefaultComponent(GraphicsExporterComponentType, kQTFileTypePicture, &exporter);
        if (noErr == err)
        {
            m_pictHandle = (PicHandle) NewHandle(0);
            if ( m_pictHandle )
            {
                // QT does not correctly export the mask
                // TODO if we get around to it create a synthetic PICT with the CopyBits and Mask commands
                CGImageRef imageRef = CreateCGImage();
                err = GraphicsExportSetInputCGImage( exporter, imageRef );
                err = GraphicsExportSetOutputHandle(exporter, (Handle)m_pictHandle);
                err = GraphicsExportDoExport(exporter, NULL);
                CGImageRelease( imageRef );

                size_t handleSize = GetHandleSize( (Handle) m_pictHandle );
                // the 512 bytes header is only needed for pict files, but not in memory
                if ( handleSize >= 512 )
                {
                    memmove( *m_pictHandle , (char*)(*m_pictHandle)+512, handleSize - 512 );
                    SetHandleSize( (Handle) m_pictHandle, handleSize - 512 );
                }
            }
            CloseComponent( exporter );
        }
#endif
    }

    return m_pictHandle ;
}
#endif

CGImageRef wxBitmapRefData::CreateCGImage() const
{
    wxASSERT( m_ok ) ;
    wxASSERT( m_rawAccessCount >= 0 ) ;
    CGImageRef image ;
    if ( m_rawAccessCount > 0 || m_cgImageRef == NULL )
    {
        if ( m_depth != 1 && m_bitmapMask == NULL )
        {
#if 0
            // in order for this code to work properly, wxMask would have to invert black and white
            // in the native bitmap
            if ( m_bitmapMask )
            {
                CGImageRef tempImage = CGBitmapContextCreateImage( m_hBitmap );
                CGImageRef tempMask = CGBitmapContextCreateImage((CGContextRef) m_bitmapMask->GetHBITMAP() );
                image = CGImageCreateWithMask( tempImage, tempMask );
                CGImageRelease(tempMask);
                CGImageRelease(tempImage);
            }
            else
#endif
                image = CGBitmapContextCreateImage( m_hBitmap );
        }
        else
        {
            size_t imageSize = m_height * m_bytesPerRow ;
            void * dataBuffer = m_memBuf.GetData() ;
            int w = m_width ;
            int h = m_height ;
            CGImageAlphaInfo alphaInfo = kCGImageAlphaNoneSkipFirst ;
            wxMemoryBuffer membuf;

            if ( m_bitmapMask )
            {
                alphaInfo = kCGImageAlphaFirst ;
                unsigned char *destalphastart = (unsigned char*) membuf.GetWriteBuf( imageSize ) ;
                memcpy( destalphastart , dataBuffer , imageSize ) ;
                unsigned char *sourcemaskstart = (unsigned char *) m_bitmapMask->GetRawAccess() ;
                int maskrowbytes = m_bitmapMask->GetBytesPerRow() ;
                for ( int y = 0 ; y < h ; ++y , destalphastart += m_bytesPerRow, sourcemaskstart += maskrowbytes)
                {
                    unsigned char *sourcemask = sourcemaskstart ;
                    unsigned char *destalpha = destalphastart ;
                    for ( int x = 0 ; x < w ; ++x , sourcemask += kMaskBytesPerPixel , destalpha += 4 )
                    {
                        *destalpha = 0xFF - *sourcemask ;
                    }
                }
                membuf.UngetWriteBuf( imageSize );
            }
            else
            {
                if ( m_hasAlpha )
                {
#if wxOSX_USE_PREMULTIPLIED_ALPHA
                    alphaInfo = kCGImageAlphaPremultipliedFirst ;
#else
                    alphaInfo = kCGImageAlphaFirst ;
#endif
                }

                membuf = m_memBuf;
            }

            CGDataProviderRef dataProvider = NULL ;
            if ( m_depth == 1 )
            {
                // TODO CHECK ALIGNMENT
                wxMemoryBuffer maskBuf;
                unsigned char * maskBufData = (unsigned char*) maskBuf.GetWriteBuf( m_width * m_height );
                unsigned char * bufData = (unsigned char *) membuf.GetData() ;
                // copy one color component
                size_t i = 0;
                for( int y = 0 ; y < m_height ; bufData+= m_bytesPerRow, ++y )
                {
                    unsigned char *bufDataIter = bufData+3;
                    for ( int x = 0 ; x < m_width ; bufDataIter += 4, ++x, ++i )
                    {
                        maskBufData[i] = *bufDataIter;
                    }
                }
                maskBuf.UngetWriteBuf( m_width * m_height );

                dataProvider =
                    wxMacCGDataProviderCreateWithMemoryBuffer( maskBuf );

                image = ::CGImageMaskCreate( w, h, 8, 8, m_width , dataProvider, NULL, false );
            }
            else
            {
                CGColorSpaceRef colorSpace = wxMacGetGenericRGBColorSpace();
                dataProvider = wxMacCGDataProviderCreateWithMemoryBuffer( membuf );
                image =
                    ::CGImageCreate(
                                    w, h, 8 , 32 , m_bytesPerRow , colorSpace, alphaInfo ,
                                    dataProvider, NULL , false , kCGRenderingIntentDefault );
            }
            CGDataProviderRelease( dataProvider);
        }
    }
    else
    {
        image = m_cgImageRef ;
        CGImageRetain( image ) ;
    }

    if ( m_rawAccessCount == 0 && m_cgImageRef == NULL)
    {
        // we keep it for later use
        m_cgImageRef = image ;
        CGImageRetain( image ) ;
    }

    return image ;
}

CGContextRef wxBitmapRefData::GetBitmapContext() const
{
    return m_hBitmap;
}

void wxBitmapRefData::Free()
{
    wxASSERT_MSG( m_rawAccessCount == 0 , wxT("Bitmap still selected when destroyed") ) ;

    if ( m_cgImageRef )
    {
        CGImageRelease( m_cgImageRef ) ;
        m_cgImageRef = NULL ;
    }
#ifndef __WXOSX_IPHONE__
    if ( m_iconRef )
    {
        ReleaseIconRef( m_iconRef ) ;
        m_iconRef = NULL ;
    }

#ifndef __LP64__
    if ( m_pictHandle )
    {
        KillPicture( m_pictHandle ) ;
        m_pictHandle = NULL ;
    }
#endif
#endif
    if ( m_hBitmap )
    {
        CGContextRelease(m_hBitmap);
        m_hBitmap = NULL ;
    }

    wxDELETE(m_bitmapMask);
}

wxBitmapRefData::~wxBitmapRefData()
{
    Free() ;
}


// ----------------------------------------------------------------------------
// wxBitmap
// ----------------------------------------------------------------------------

bool wxBitmap::CopyFromIcon(const wxIcon& icon)
{
    bool created = false ;
    int w = icon.GetWidth() ;
    int h = icon.GetHeight() ;

    Create( w , h ) ;
#ifdef __WXOSX_CARBON__
    if ( w == h && ( w == 16 || w == 32 || w == 48 || w == 128 ) )
    {
        IconFamilyHandle iconFamily = NULL ;
        Handle imagehandle = NewHandle( 0 ) ;
        Handle maskhandle = NewHandle( 0 ) ;

        OSType maskType = 0;
        OSType dataType = 0;
        IconSelectorValue selector = 0 ;

        switch (w)
        {
            case 128:
                dataType = kThumbnail32BitData ;
                maskType = kThumbnail8BitMask ;
                selector = kSelectorAllAvailableData ;
                break;

            case 48:
                dataType = kHuge32BitData ;
                maskType = kHuge8BitMask ;
                selector = kSelectorHuge32Bit | kSelectorHuge8BitMask ;
                break;

            case 32:
                dataType = kLarge32BitData ;
                maskType = kLarge8BitMask ;
                selector = kSelectorLarge32Bit | kSelectorLarge8BitMask ;
                break;

            case 16:
                dataType = kSmall32BitData ;
                maskType = kSmall8BitMask ;
                selector = kSelectorSmall32Bit | kSelectorSmall8BitMask ;
                break;

            default:
                break;
        }

        OSStatus err = IconRefToIconFamily( MAC_WXHICON(icon.GetHICON()) , selector , &iconFamily ) ;

        err = GetIconFamilyData( iconFamily , dataType , imagehandle ) ;
        err = GetIconFamilyData( iconFamily , maskType , maskhandle ) ;
        size_t imagehandlesize = GetHandleSize( imagehandle ) ;
        size_t maskhandlesize = GetHandleSize( maskhandle ) ;

        if ( imagehandlesize != 0 && maskhandlesize != 0 )
        {
            wxASSERT( GetHandleSize( imagehandle ) == w * 4 * h ) ;
            wxASSERT( GetHandleSize( maskhandle ) == w * h ) ;

            UseAlpha() ;

            unsigned char *source = (unsigned char *) *imagehandle ;
            unsigned char *sourcemask = (unsigned char *) *maskhandle ;
            unsigned char* destination = (unsigned char*) BeginRawAccess() ;

            for ( int y = 0 ; y < h ; ++y )
            {
                for ( int x = 0 ; x < w ; ++x )
                {
                    unsigned char a = *sourcemask++;
                    *destination++ = a;
                    source++ ;
#if wxOSX_USE_PREMULTIPLIED_ALPHA
                    *destination++ = ( (*source++) * a + 127 ) / 255;
                    *destination++ = ( (*source++) * a + 127 ) / 255;
                    *destination++ = ( (*source++) * a + 127 ) / 255;
#else
                    *destination++ = *source++ ;
                    *destination++ = *source++ ;
                    *destination++ = *source++ ;
#endif
                }
            }

            EndRawAccess() ;
            DisposeHandle( imagehandle ) ;
            DisposeHandle( maskhandle ) ;
            created = true ;
        }

        DisposeHandle( (Handle) iconFamily ) ;
    }
#endif
    if ( !created )
    {
        wxMemoryDC dc ;
        dc.SelectObject( *this ) ;
        dc.DrawIcon( icon , 0 , 0 ) ;
        dc.SelectObject( wxNullBitmap ) ;
    }

    return true;
}

wxBitmap::wxBitmap(const char bits[], int the_width, int the_height, int no_bits)
{
    wxBitmapRefData* bitmapRefData;

    m_refData = bitmapRefData = new wxBitmapRefData( the_width , the_height , no_bits ) ;

    if (bitmapRefData->IsOk())
    {
        if ( no_bits == 1 )
        {
            int linesize = ( the_width / (sizeof(unsigned char) * 8)) ;
            if ( the_width % (sizeof(unsigned char) * 8) )
                linesize += sizeof(unsigned char);

            unsigned char* linestart = (unsigned char*) bits ;
            unsigned char* destptr = (unsigned char*) BeginRawAccess() ;

            for ( int y = 0 ; y < the_height ; ++y , linestart += linesize, destptr += M_BITMAPDATA->GetBytesPerRow() )
            {
                unsigned char* destination = destptr;
                int index, bit, mask;

                for ( int x = 0 ; x < the_width ; ++x )
                {
                    index = x / 8 ;
                    bit = x % 8 ;
                    mask = 1 << bit ;

                    if ( linestart[index] & mask )
                    {
                        *destination++ = 0xFF ;
                        *destination++ = 0 ;
                        *destination++ = 0 ;
                        *destination++ = 0 ;
                    }
                    else
                    {
                        *destination++ = 0xFF ;
                        *destination++ = 0xFF ;
                        *destination++ = 0xFF ;
                        *destination++ = 0xFF ;
                    }
                }
            }

            EndRawAccess() ;
        }
        else
        {
            wxFAIL_MSG(wxT("multicolor BITMAPs not yet implemented"));
        }
    } /* bitmapRefData->IsOk() */
}

wxBitmap::wxBitmap(const void* data, wxBitmapType type, int width, int height, int depth)
{
    (void) Create(data, type, width, height, depth);
}

wxBitmap::wxBitmap(const wxString& filename, wxBitmapType type)
{
    LoadFile(filename, type);
}

wxBitmap::wxBitmap(CGImageRef image)
{
    (void) Create(image);
}

wxGDIRefData* wxBitmap::CreateGDIRefData() const
{
    return new wxBitmapRefData;
}

wxGDIRefData* wxBitmap::CloneGDIRefData(const wxGDIRefData* data) const
{
    return new wxBitmapRefData(*static_cast<const wxBitmapRefData *>(data));
}

void * wxBitmap::GetRawAccess() const
{
    wxCHECK_MSG( IsOk() , NULL , wxT("invalid bitmap") ) ;

    return M_BITMAPDATA->GetRawAccess() ;
}

void * wxBitmap::BeginRawAccess()
{
    wxCHECK_MSG( IsOk() , NULL , wxT("invalid bitmap") ) ;

    return M_BITMAPDATA->BeginRawAccess() ;
}

void wxBitmap::EndRawAccess()
{
    wxCHECK_RET( IsOk() , wxT("invalid bitmap") ) ;

    M_BITMAPDATA->EndRawAccess() ;
}

CGImageRef wxBitmap::CreateCGImage() const
{
    wxCHECK_MSG( IsOk(), NULL , wxT("invalid bitmap") ) ;

    return M_BITMAPDATA->CreateCGImage() ;
}

#ifndef  __WXOSX_IPHONE__
IconRef wxBitmap::GetIconRef() const
{
    wxCHECK_MSG( IsOk(), NULL , wxT("invalid bitmap") ) ;

    return M_BITMAPDATA->GetIconRef() ;
}

IconRef wxBitmap::CreateIconRef() const
{
    IconRef icon = GetIconRef();
    verify_noerr( AcquireIconRef(icon) );
    return icon;
}
#endif

#if wxOSX_USE_COCOA

WX_NSImage wxBitmap::GetNSImage() const
{
    wxCFRef< CGImageRef > cgimage(CreateCGImage());
    return wxOSXGetNSImageFromCGImage( cgimage );
}

#endif

#if wxOSX_USE_IPHONE

WX_UIImage wxBitmap::GetUIImage() const
{
    wxCFRef< CGImageRef > cgimage(CreateCGImage());
    return wxOSXGetUIImageFromCGImage( cgimage );
}

#endif
wxBitmap wxBitmap::GetSubBitmap(const wxRect &rect) const
{
    wxCHECK_MSG( IsOk() &&
                (rect.x >= 0) && (rect.y >= 0) &&
                (rect.x+rect.width <= GetWidth()) &&
                (rect.y+rect.height <= GetHeight()),
                wxNullBitmap, wxT("invalid bitmap or bitmap region") );

    wxBitmap ret( rect.width, rect.height, GetDepth() );
    wxASSERT_MSG( ret.IsOk(), wxT("GetSubBitmap error") );

    int destwidth = rect.width ;
    int destheight = rect.height ;

    {
        unsigned char *sourcedata = (unsigned char*) GetRawAccess() ;
        unsigned char *destdata = (unsigned char*) ret.BeginRawAccess() ;
        wxASSERT( (sourcedata != NULL) && (destdata != NULL) ) ;

        int sourcelinesize = GetBitmapData()->GetBytesPerRow() ;
        int destlinesize = ret.GetBitmapData()->GetBytesPerRow() ;
        unsigned char *source = sourcedata + rect.x * 4 + rect.y * sourcelinesize ;
        unsigned char *dest = destdata ;

        for (int yy = 0; yy < destheight; ++yy, source += sourcelinesize , dest += destlinesize)
        {
            memcpy( dest , source , destlinesize ) ;
        }
    }

    ret.EndRawAccess() ;

    if ( M_BITMAPDATA->m_bitmapMask )
    {
        wxMemoryBuffer maskbuf ;
        int rowBytes = GetBestBytesPerRow( destwidth * kMaskBytesPerPixel );
        size_t maskbufsize = rowBytes * destheight ;

        int sourcelinesize = M_BITMAPDATA->m_bitmapMask->GetBytesPerRow() ;
        int destlinesize = rowBytes ;

        unsigned char *source = (unsigned char *) M_BITMAPDATA->m_bitmapMask->GetRawAccess() ;
        unsigned char *destdata = (unsigned char * ) maskbuf.GetWriteBuf( maskbufsize ) ;
        wxASSERT( (source != NULL) && (destdata != NULL) ) ;

        source += rect.x * kMaskBytesPerPixel + rect.y * sourcelinesize ;
        unsigned char *dest = destdata ;

        for (int yy = 0; yy < destheight; ++yy, source += sourcelinesize , dest += destlinesize)
        {
            memcpy( dest , source , destlinesize ) ;
        }

        maskbuf.UngetWriteBuf( maskbufsize ) ;
        ret.SetMask( new wxMask( maskbuf , destwidth , destheight , rowBytes ) ) ;
    }
    else if ( HasAlpha() )
        ret.UseAlpha() ;

    return ret;
}

bool wxBitmap::Create(int w, int h, int d)
{
    UnRef();

    if ( d < 0 )
        d = wxDisplayDepth() ;

    m_refData = new wxBitmapRefData( w , h , d );

    return M_BITMAPDATA->IsOk() ;
}


bool wxBitmap::Create(CGImageRef image)
{
    UnRef();
    
    m_refData = new wxBitmapRefData( image );
    
    return M_BITMAPDATA->IsOk() ;
}

bool wxBitmap::LoadFile(const wxString& filename, wxBitmapType type)
{
    UnRef();

    wxBitmapHandler *handler = FindHandler(type);

    if ( handler )
    {
        m_refData = new wxBitmapRefData;

        return handler->LoadFile(this, filename, type, -1, -1);
    }
    else
    {
#if wxUSE_IMAGE
        wxImage loadimage(filename, type);
        if (loadimage.IsOk())
        {
            *this = loadimage;

            return true;
        }
#endif
    }

    wxLogWarning(wxT("no bitmap handler for type %d defined."), type);

    return false;
}

bool wxBitmap::Create(const void* data, wxBitmapType type, int width, int height, int depth)
{
    UnRef();

    m_refData = new wxBitmapRefData;

    wxBitmapHandler *handler = FindHandler(type);

    if ( handler == NULL )
    {
        wxLogWarning(wxT("no bitmap handler for type %d defined."), type);

        return false;
    }

    return handler->Create(this, data, type, width, height, depth);
}

#if wxUSE_IMAGE

wxBitmap::wxBitmap(const wxImage& image, int depth)
{
    wxCHECK_RET( image.IsOk(), wxT("invalid image") );

    // width and height of the device-dependent bitmap
    int width = image.GetWidth();
    int height = image.GetHeight();

    wxBitmapRefData* bitmapRefData;

    m_refData = bitmapRefData = new wxBitmapRefData( width , height , depth ) ;

    if ( bitmapRefData->IsOk())
    {
        // Create picture

        bool hasAlpha = false ;

        if ( image.HasMask() )
        {
            // takes precedence, don't mix with alpha info
        }
        else
        {
            hasAlpha = image.HasAlpha() ;
        }

        if ( hasAlpha )
            UseAlpha() ;

        unsigned char* destinationstart = (unsigned char*) BeginRawAccess() ;
        register unsigned char* data = image.GetData();
        if ( destinationstart != NULL && data != NULL )
        {
            const unsigned char *alpha = hasAlpha ? image.GetAlpha() : NULL ;
            for (int y = 0; y < height; destinationstart += M_BITMAPDATA->GetBytesPerRow(), y++)
            {
                unsigned char * destination = destinationstart;
                for (int x = 0; x < width; x++)
                {
                    if ( hasAlpha )
                    {
                        const unsigned char a = *alpha++;
                        *destination++ = a ;

    #if wxOSX_USE_PREMULTIPLIED_ALPHA
                        *destination++ = ((*data++) * a + 127) / 255 ;
                        *destination++ = ((*data++) * a + 127) / 255 ;
                        *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() ) ) ) ;
    } /* bitmapRefData->IsOk() */
}

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

    wxCHECK_MSG( IsOk(), 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* sourcestart = (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++ , sourcestart += M_BITMAPDATA->GetBytesPerRow() , mask += maskBytesPerRow )
    {
        unsigned char * maskp = mask ;
        unsigned char * source = sourcestart;
        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 ;
            }
            else if ( hasAlpha )
            {
                *alpha++ = a ;
#if wxOSX_USE_PREMULTIPLIED_ALPHA
                // this must be non-premultiplied data
                if ( a != 0xFF && a!= 0 )
                {
                    r = r * 255 / a;
                    g = g * 255 / a;
                    b = b * 255 / a;
                }
#endif
            }

            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;
}

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

   return M_BITMAPDATA->GetHeight();
}

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

   return M_BITMAPDATA->GetWidth() ;
}

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

   return M_BITMAPDATA->GetDepth();
}

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

   return M_BITMAPDATA->m_bitmapMask;
}

bool wxBitmap::HasAlpha() const
{
   wxCHECK_MSG( IsOk(), 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( IsOk(), 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
{
    wxUnusedVar(mask);

    return WXHBITMAP(M_BITMAPDATA->GetBitmapContext());
}

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

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

wxMask::wxMask(const wxMask &tocopy) : wxObject()
{
    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();
    memcpy( dest, source, size );
    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()
{
    if ( m_maskBitmap )
    {
        CGContextRelease( (CGContextRef) m_maskBitmap );
        m_maskBitmap = NULL ;
    }
}

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()
{
    if ( m_maskBitmap )
    {
        CGContextRelease( (CGContextRef) m_maskBitmap );
       m_maskBitmap = NULL ;
    }

    CGColorSpaceRef colorspace = CGColorSpaceCreateDeviceGray();
    // from MouseTracking sample :
    // Ironically, due to a bug in CGImageCreateWithMask, you cannot use
    // CGColorSpaceCreateWithName(kCGColorSpaceGenericGray) at this point!

    m_maskBitmap = CGBitmapContextCreate((char*) m_memBuf.GetData(), m_width, m_height, 8, m_bytesPerRow, colorspace,
        kCGImageAlphaNone );
    CGColorSpaceRelease( colorspace );
    wxASSERT_MSG( m_maskBitmap , wxT("Unable to create CGBitmapContext context") ) ;
}

// 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 = GetBestBytesPerRow( m_width * kMaskBytesPerPixel ) ;

    size_t size = m_bytesPerRow * m_height ;
    unsigned char * destdatabase = (unsigned char*) m_memBuf.GetWriteBuf( size ) ;
    wxASSERT( destdatabase != NULL ) ;
    
    if ( destdatabase )
    {
        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 ;
                else
                    *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 = GetBestBytesPerRow( m_width * kMaskBytesPerPixel ) ;

    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 * srcdatabase = (unsigned char*) bitmap.GetRawAccess() ;
    size_t sourceBytesRow = bitmap.GetBitmapData()->GetBytesPerRow();

    for ( int y = 0 ; y < m_height ; ++y , srcdatabase+= sourceBytesRow, destdatabase += m_bytesPerRow)
    {
        unsigned char *srcdata = srcdatabase ;
        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 ;
            else
                *destdata++ = 0x00 ;
        }
    }

    m_memBuf.UngetWriteBuf( size ) ;
    RealizeNative() ;

    return true;
}

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

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

class WXDLLEXPORT wxBundleResourceHandler: public wxBitmapHandler
{
    DECLARE_ABSTRACT_CLASS(wxPNGResourceHandler)
    
public:
    inline wxBundleResourceHandler()
    {
    };
    
    virtual bool LoadFile(wxBitmap *bitmap,
                          const wxString& name,
                          wxBitmapType type,
                          int desiredWidth,
                          int desiredHeight);
};

IMPLEMENT_ABSTRACT_CLASS(wxBundleResourceHandler, wxBitmapHandler);

class WXDLLEXPORT wxPNGResourceHandler: public wxBundleResourceHandler
{
    DECLARE_DYNAMIC_CLASS(wxPNGResourceHandler)
    
public:
    inline wxPNGResourceHandler()
    {
        SetName(wxT("PNG resource"));
        SetExtension("PNG");
        SetType(wxBITMAP_TYPE_PNG_RESOURCE);
    };
};

IMPLEMENT_DYNAMIC_CLASS(wxPNGResourceHandler, wxBundleResourceHandler)

class WXDLLEXPORT wxJPEGResourceHandler: public wxBundleResourceHandler
{
    DECLARE_DYNAMIC_CLASS(wxPNGResourceHandler)
    
public:
    inline wxJPEGResourceHandler()
    {
        SetName(wxT("JPEG resource"));
        SetExtension("JPEG");
        SetType(wxBITMAP_TYPE_JPEG_RESOURCE);
    };
};

IMPLEMENT_DYNAMIC_CLASS(wxJPEGResourceHandler, wxBundleResourceHandler)

bool wxBundleResourceHandler::LoadFile(wxBitmap *bitmap,
                                     const wxString& name,
                                     wxBitmapType WXUNUSED(type),
                                     int WXUNUSED(desiredWidth),
                                     int WXUNUSED(desiredHeight))
{
    wxString ext = GetExtension().Lower();
    wxCFStringRef resname(name);
    wxCFStringRef restype(ext);
    
    wxCFRef<CFURLRef> imageURL(CFBundleCopyResourceURL(CFBundleGetMainBundle(), resname, restype, NULL));
    
    if ( imageURL.get() != NULL )
    {
        // Create the data provider object
        wxCFRef<CGDataProviderRef> provider(CGDataProviderCreateWithURL (imageURL) );
        CGImageRef image = NULL;
        
        if ( ext == "jpeg" )
            image = CGImageCreateWithJPEGDataProvider (provider, NULL, true,
                                                   kCGRenderingIntentDefault);
        else if ( ext == "png" )
            image = CGImageCreateWithPNGDataProvider (provider, NULL, true,
                                                       kCGRenderingIntentDefault);
        if ( image != NULL )
        {
            bitmap->Create(image);
            CGImageRelease(image);
        }
    }
        
    return false ;
}

#if !defined( __LP64__ ) && !defined(__WXOSX_IPHONE__)

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,
                          wxBitmapType type,
                          int desiredWidth,
                          int desiredHeight);
};

IMPLEMENT_DYNAMIC_CLASS(wxPICTResourceHandler, wxBitmapHandler)


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

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

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

        return true ;
    }
#endif

    return false ;
}
#endif

void wxBitmap::InitStandardHandlers()
{
#if !defined( __LP64__ ) && !defined(__WXOSX_IPHONE__)
    AddHandler( new wxPICTResourceHandler ) ;
#endif
#if wxOSX_USE_COCOA_OR_CARBON
    AddHandler( new wxICONResourceHandler ) ;
#endif
    AddHandler( new wxPNGResourceHandler );
    AddHandler( new wxJPEGResourceHandler );
}

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

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

    data.m_width = GetWidth() ;
    data.m_height = GetHeight() ;
    data.m_stride = GetBitmapData()->GetBytesPerRow() ;

    return BeginRawAccess() ;
}

void wxBitmap::UngetRawData(wxPixelDataBase& WXUNUSED(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 );
}