cleanup - reformatting; simplified OnPaint

[wxWidgets.git] / src / msw / bitmap.cpp

diff --git a/src/msw/bitmap.cpp b/src/msw/bitmap.cpp
index 8eba1311e536c396c4b1e7069cd6767056e976ec..2f96e67b5ef3b13a39af8b77033eaba1c60da76a 100644 (file)
--- a/src/msw/bitmap.cpp
+++ b/src/msw/bitmap.cpp
@@ -1,12 +1,12 @@
-/////////////////////////////////////////////////////////////////////////////
+////////////////////////////////////////////////////////////////////////////

 // Name:        bitmap.cpp
 // Purpose:     wxBitmap
 // Author:      Julian Smart
 // Modified by:
 // Created:     04/01/98
 // RCS-ID:      $Id$
 // Name:        bitmap.cpp
 // Purpose:     wxBitmap
 // Author:      Julian Smart
 // Modified by:
 // Created:     04/01/98
 // RCS-ID:      $Id$

-// Copyright:   (c) Julian Smart and Markus Holzem
-// Licence:     wxWindows license
+// Copyright:   (c) Julian Smart
+// Licence:     wxWindows licence

 /////////////////////////////////////////////////////////////////////////////
 
 // ============================================================================
 /////////////////////////////////////////////////////////////////////////////
 
 // ============================================================================


@@ -17,10 +17,6 @@
 // headers
 // ----------------------------------------------------------------------------
 
 // headers
 // ----------------------------------------------------------------------------
 

-#ifdef __GNUG__
-    #pragma implementation "bitmap.h"
-#endif
-

 // For compilers that support precompilation, includes "wx.h".
 #include "wx/wxprec.h"
 
 // For compilers that support precompilation, includes "wx.h".
 #include "wx/wxprec.h"
 


@@ -43,33 +39,181 @@
 #include "wx/msw/private.h"
 #include "wx/log.h"
 
 #include "wx/msw/private.h"
 #include "wx/log.h"
 

+#if wxUSE_WXDIB

 #include "wx/msw/dib.h"
 #include "wx/msw/dib.h"

+#endif
+

 #include "wx/image.h"
 #include "wx/image.h"

+#include "wx/xpmdecod.h"
+
+#ifdef wxHAVE_RAW_BITMAP
+#include "wx/rawbmp.h"
+#endif
+
+// missing from mingw32 header
+#ifndef CLR_INVALID
+    #define CLR_INVALID ((COLORREF)-1)
+#endif // no CLR_INVALID
+
+// ----------------------------------------------------------------------------
+// Bitmap data
+// ----------------------------------------------------------------------------
+
+class WXDLLEXPORT wxBitmapRefData : public wxGDIImageRefData
+{
+public:
+    wxBitmapRefData();
+    wxBitmapRefData(const wxBitmapRefData& data);
+    virtual ~wxBitmapRefData() { Free(); }
+
+    virtual void Free();
+
+    // set the mask object to use as the mask, we take ownership of it
+    void SetMask(wxMask *mask)
+    {
+        delete m_bitmapMask;
+        m_bitmapMask = mask;
+    }
+
+    // set the HBITMAP to use as the mask
+    void SetMask(HBITMAP hbmpMask)
+    {
+        SetMask(new wxMask((WXHBITMAP)hbmpMask));
+    }
+
+    // return the mask
+    wxMask *GetMask() const { return m_bitmapMask; }
+
+public:
+#if wxUSE_PALETTE
+    wxPalette     m_bitmapPalette;
+#endif // wxUSE_PALETTE
+
+    // MSW-specific
+    // ------------
+
+#ifdef __WXDEBUG__
+    // this field is solely for error checking: we detect selecting a bitmap
+    // into more than one DC at once or deleting a bitmap still selected into a
+    // DC (both are serious programming errors under Windows)
+    wxDC         *m_selectedInto;
+#endif // __WXDEBUG__
+
+#if wxUSE_WXDIB
+    // when GetRawData() is called for a DDB we need to convert it to a DIB
+    // first to be able to provide direct access to it and we cache that DIB
+    // here and convert it back to DDB when UngetRawData() is called
+    wxDIB *m_dib;
+#endif
+
+    // true if we have alpha transparency info and can be drawn using
+    // AlphaBlend()
+    bool m_hasAlpha;
+
+    // true if our HBITMAP is a DIB section, false if it is a DDB
+    bool m_isDIB;
+
+private:
+    // optional mask for transparent drawing
+    wxMask       *m_bitmapMask;
+
+
+    // not implemented
+    wxBitmapRefData& operator=(const wxBitmapRefData&);
+};

 
 // ----------------------------------------------------------------------------
 // macros
 // ----------------------------------------------------------------------------
 
 
 // ----------------------------------------------------------------------------
 // macros
 // ----------------------------------------------------------------------------
 

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

 
 

-    IMPLEMENT_DYNAMIC_CLASS(wxBitmapHandler, wxObject)
+IMPLEMENT_DYNAMIC_CLASS(wxBitmapHandler, wxObject)

 
 // ============================================================================
 // implementation
 // ============================================================================
 
 
 // ============================================================================
 // implementation
 // ============================================================================
 

+// ----------------------------------------------------------------------------
+// helper functions
+// ----------------------------------------------------------------------------
+
+// decide whether we should create a DIB or a DDB for the given parameters
+//
+// NB: we always use DIBs under Windows CE as this is much simpler (even if
+//     also less efficient...) and we obviously can't use them if there is no
+//     DIB support compiled in at all
+#ifdef __WXWINCE__
+    static inline bool wxShouldCreateDIB(int, int, int, WXHDC) { return true; }
+
+    #define ALWAYS_USE_DIB
+#elif !wxUSE_WXDIB
+    // no sense in defining wxShouldCreateDIB() as we can't compile code
+    // executed if it is true, so we have to use #if's anyhow
+    #define NEVER_USE_DIB
+#else // wxUSE_WXDIB && !__WXWINCE__
+    static inline bool wxShouldCreateDIB(int w, int h, int d, WXHDC hdc)
+    {
+        // here is the logic:
+        //
+        //  (a) if hdc is specified, the caller explicitly wants DDB
+        //  (b) otherwise, create a DIB if depth >= 24 (we don't support 16bpp
+        //      or less DIBs anyhow)
+        //  (c) finally, create DIBs under Win9x even if the depth hasn't been
+        //      explicitly specified but the current display depth is 24 or
+        //      more and the image is "big", i.e. > 16Mb which is the
+        //      theoretical limit for DDBs under Win9x
+        //
+        // consequences (all of which seem to make sense):
+        //
+        //  (i)     by default, DDBs are created (depth == -1 usually)
+        //  (ii)    DIBs can be created by explicitly specifying the depth
+        //  (iii)   using a DC always forces creating a DDB
+        return !hdc &&
+                (d >= 24 ||
+                    (d == -1 &&
+                        wxDIB::GetLineSize(w, wxDisplayDepth())*h > 16*1024*1024));
+    }
+
+    #define SOMETIMES_USE_DIB
+#endif // different DIB usage scenarious
+

 // ----------------------------------------------------------------------------
 // wxBitmapRefData
 // ----------------------------------------------------------------------------
 
 wxBitmapRefData::wxBitmapRefData()
 {
 // ----------------------------------------------------------------------------
 // wxBitmapRefData
 // ----------------------------------------------------------------------------
 
 wxBitmapRefData::wxBitmapRefData()
 {

-    m_quality = 0;
+#ifdef __WXDEBUG__

     m_selectedInto = NULL;
     m_selectedInto = NULL;

-    m_numColors = 0;
+#endif

     m_bitmapMask = NULL;
     m_bitmapMask = NULL;

+

     m_hBitmap = (WXHBITMAP) NULL;
     m_hBitmap = (WXHBITMAP) NULL;

+#if wxUSE_WXDIB
+    m_dib = NULL;
+#endif
+
+    m_isDIB =
+    m_hasAlpha = false;
+}
+
+wxBitmapRefData::wxBitmapRefData(const wxBitmapRefData& data)
+               : wxGDIImageRefData(data)
+{
+#ifdef __WXDEBUG__
+    m_selectedInto = NULL;
+#endif
+
+    // can't copy the mask as the other bitmap destroys it
+    m_bitmapMask = NULL;
+
+    wxASSERT_MSG( !data.m_isDIB,
+                    _T("can't copy bitmap locked for raw access!") );
+    m_isDIB = false;
+
+    m_hasAlpha = data.m_hasAlpha;

 }
 
 void wxBitmapRefData::Free()
 }
 
 void wxBitmapRefData::Free()


@@ -77,11 +221,15 @@ void wxBitmapRefData::Free()
     wxASSERT_MSG( !m_selectedInto,
                   wxT("deleting bitmap still selected into wxMemoryDC") );
 
     wxASSERT_MSG( !m_selectedInto,
                   wxT("deleting bitmap still selected into wxMemoryDC") );
 

+#if wxUSE_WXDIB
+    wxASSERT_MSG( !m_dib, _T("forgot to call wxBitmap::UngetRawData()!") );
+#endif
+

     if ( m_hBitmap)
     {
         if ( !::DeleteObject((HBITMAP)m_hBitmap) )
         {
     if ( m_hBitmap)
     {
         if ( !::DeleteObject((HBITMAP)m_hBitmap) )
         {

-            wxLogLastError("DeleteObject(hbitmap)");
+            wxLogLastError(wxT("DeleteObject(hbitmap)"));

         }
     }
 
         }
     }
 


@@ -93,28 +241,51 @@ void wxBitmapRefData::Free()
 // wxBitmap creation
 // ----------------------------------------------------------------------------
 
 // wxBitmap creation
 // ----------------------------------------------------------------------------
 

-// this function should be called from all wxBitmap ctors
-void wxBitmap::Init()
+wxGDIImageRefData *wxBitmap::CreateData() const
+{
+    return new wxBitmapRefData;
+}
+
+wxObjectRefData *wxBitmap::CloneRefData(const wxObjectRefData *dataOrig) const

 {
 {

-    // m_refData = NULL; done in the base class ctor
+    const wxBitmapRefData *
+        data = wx_static_cast(const wxBitmapRefData *, dataOrig);
+    if ( !data )
+        return NULL;
+
+    wxBitmap *self = wx_const_cast(wxBitmap *, this);

 
 

-    if ( wxTheBitmapList )
-        wxTheBitmapList->AddBitmap(this);
+#if wxUSE_WXDIB
+    // copy the other bitmap
+    if ( data->m_hBitmap )
+    {
+        wxDIB dib((HBITMAP)(data->m_hBitmap));
+        self->CopyFromDIB(dib);
+    }
+    else
+#endif // wxUSE_WXDIB
+    {
+        // don't copy the bitmap data, but do copy the size, depth, ...
+        self->m_refData = new wxBitmapRefData(*data);
+    }
+
+    return m_refData;

 }
 
 #ifdef __WIN32__
 
 bool wxBitmap::CopyFromIconOrCursor(const wxGDIImage& icon)
 {
 }
 
 #ifdef __WIN32__
 
 bool wxBitmap::CopyFromIconOrCursor(const wxGDIImage& icon)
 {

+#if !defined(__WXMICROWIN__) && !defined(__WXWINCE__)

     // it may be either HICON or HCURSOR
     HICON hicon = (HICON)icon.GetHandle();
 
     ICONINFO iconInfo;
     if ( !::GetIconInfo(hicon, &iconInfo) )
     {
     // it may be either HICON or HCURSOR
     HICON hicon = (HICON)icon.GetHandle();
 
     ICONINFO iconInfo;
     if ( !::GetIconInfo(hicon, &iconInfo) )
     {

-        wxLogLastError("GetIconInfo");
+        wxLogLastError(wxT("GetIconInfo"));

 
 

-        return FALSE;
+        return false;

     }
 
     wxBitmapRefData *refData = new wxBitmapRefData;
     }
 
     wxBitmapRefData *refData = new wxBitmapRefData;


@@ -129,34 +300,46 @@ bool wxBitmap::CopyFromIconOrCursor(const wxGDIImage& icon)
 
     refData->m_hBitmap = (WXHBITMAP)iconInfo.hbmColor;
 
 
     refData->m_hBitmap = (WXHBITMAP)iconInfo.hbmColor;
 

-    // the mask returned by GetIconInfo() is inversed compared to the usual
-    // wxWin convention
-    HBITMAP hbmpMask = ::CreateBitmap(w, h, 1, 1, 0);
-
-    // the icons mask is opposite to the usual wxWin convention
-    HDC dcSrc = ::CreateCompatibleDC(NULL);
-    HDC dcDst = ::CreateCompatibleDC(NULL);
-    (void)SelectObject(dcSrc, iconInfo.hbmMask);
-    (void)SelectObject(dcDst, hbmpMask);
-
-    HBRUSH brush = ::CreateSolidBrush(RGB(255, 255, 255));
-    RECT rect = { 0, 0, w, h };
-    FillRect(dcDst, &rect, brush);
-
-    BitBlt(dcDst, 0, 0, w, h, dcSrc, 0, 0, SRCINVERT);
-
-    SelectObject(dcDst, NULL);
-    SelectObject(dcSrc, NULL);
-    DeleteDC(dcDst);
-    DeleteDC(dcSrc);
-
-    refData->m_bitmapMask = new wxMask((WXHBITMAP)hbmpMask);
+#if wxUSE_WXDIB
+    // If the icon is 32 bits per pixel then it may have alpha channel data,
+    // although there are some icons that are 32 bpp but have no alpha... So
+    // convert to a DIB and manually check the 4th byte for each pixel.
+    BITMAP bm;
+    if ( ::GetObject(iconInfo.hbmColor, sizeof(BITMAP), (LPVOID)&bm)
+         && bm.bmBitsPixel == 32)
+    {
+        wxDIB dib(iconInfo.hbmColor);
+        if (dib.IsOk())
+        {
+            unsigned char* pixels = dib.GetData();
+            for (int idx=0; idx<w*h*4; idx+=4)
+            {
+                if (pixels[idx+3] != 0)
+                {
+                    // If there is an alpha byte that is non-zero then set the
+                    // alpha flag and bail out of the loop.
+                    refData->m_hasAlpha = true;
+                    break;
+                }
+            }
+        }
+    }
+#endif
+    if ( !refData->m_hasAlpha )
+    {
+        // the mask returned by GetIconInfo() is inverted compared to the usual
+        // wxWin convention
+        refData->SetMask(wxInvertMask(iconInfo.hbmMask, w, h));
+    }

 
 

-#if WXWIN_COMPATIBILITY_2
-    refData->m_ok = TRUE;
-#endif // WXWIN_COMPATIBILITY_2
+    // delete the old one now as we don't need it any more
+    ::DeleteObject(iconInfo.hbmMask);

 
 

-    return TRUE;
+    return true;
+#else
+    wxUnusedVar(icon);
+    return false;
+#endif

 }
 
 #endif // Win32
 }
 
 #endif // Win32


@@ -166,15 +349,9 @@ bool wxBitmap::CopyFromCursor(const wxCursor& cursor)
     UnRef();
 
     if ( !cursor.Ok() )
     UnRef();
 
     if ( !cursor.Ok() )

-        return FALSE;
-
-#ifdef __WIN16__
-    wxFAIL_MSG( _T("don't know how to convert cursor to bitmap") );
+        return false;

 
 

-    return FALSE;
-#else

     return CopyFromIconOrCursor(cursor);
     return CopyFromIconOrCursor(cursor);

-#endif // Win16

 }
 
 bool wxBitmap::CopyFromIcon(const wxIcon& icon)
 }
 
 bool wxBitmap::CopyFromIcon(const wxIcon& icon)


@@ -182,89 +359,96 @@ bool wxBitmap::CopyFromIcon(const wxIcon& icon)
     UnRef();
 
     if ( !icon.Ok() )
     UnRef();
 
     if ( !icon.Ok() )

-        return FALSE;
+        return false;

 
 

-    // GetIconInfo() doesn't exist under Win16 and I don't know any other way
-    // to create a bitmap from icon there - but using this way we won't have
-    // the mask (FIXME)
-#ifdef __WIN16__
-    int width = icon.GetWidth(),
-        height = icon.GetHeight();
+    return CopyFromIconOrCursor(icon);
+}
+
+#ifndef NEVER_USE_DIB

 
 

-    // copy the icon to the bitmap
-    ScreenHDC hdcScreen;
-    HDC hdc = ::CreateCompatibleDC(hdcScreen);
-    HBITMAP hbitmap = ::CreateCompatibleBitmap(hdcScreen, width, height);
-    HBITMAP hbmpOld = (HBITMAP)::SelectObject(hdc, hbitmap);
+bool wxBitmap::CopyFromDIB(const wxDIB& dib)
+{
+    wxCHECK_MSG( dib.IsOk(), false, _T("invalid DIB in CopyFromDIB") );

 
 

-    ::DrawIcon(hdc, 0, 0, GetHiconOf(icon));
+#ifdef SOMETIMES_USE_DIB
+    HBITMAP hbitmap = dib.CreateDDB();
+    if ( !hbitmap )
+        return false;
+#else // ALWAYS_USE_DIB
+    HBITMAP hbitmap = ((wxDIB &)dib).Detach();  // const_cast
+#endif // SOMETIMES_USE_DIB/ALWAYS_USE_DIB

 
 

-    ::SelectObject(hdc, hbmpOld);
-    ::DeleteDC(hdc);
+    UnRef();

 
     wxBitmapRefData *refData = new wxBitmapRefData;
     m_refData = refData;
 
 
     wxBitmapRefData *refData = new wxBitmapRefData;
     m_refData = refData;
 

-    refData->m_width = width;
-    refData->m_height = height;
-    refData->m_depth = wxDisplayDepth();
+    refData->m_width = dib.GetWidth();
+    refData->m_height = dib.GetHeight();
+    refData->m_depth = dib.GetDepth();

 
     refData->m_hBitmap = (WXHBITMAP)hbitmap;
 
 
     refData->m_hBitmap = (WXHBITMAP)hbitmap;
 

-#if WXWIN_COMPATIBILITY_2
-    refData->m_ok = TRUE;
-#endif // WXWIN_COMPATIBILITY_2
+#if wxUSE_PALETTE
+    wxPalette *palette = dib.CreatePalette();
+    if ( palette )
+    {
+        refData->m_bitmapPalette = *palette;
+    }

 
 

-    return TRUE;
-#else // Win32
-    return CopyFromIconOrCursor(icon);
-#endif // Win16/Win32
+    delete palette;
+#endif // wxUSE_PALETTE
+
+    return true;

 }
 
 }
 

+#endif // NEVER_USE_DIB
+

 wxBitmap::~wxBitmap()
 {
 wxBitmap::~wxBitmap()
 {

-    if (wxTheBitmapList)
-        wxTheBitmapList->DeleteObject(this);

 }
 
 wxBitmap::wxBitmap(const char bits[], int width, int height, int depth)
 {
 }
 
 wxBitmap::wxBitmap(const char bits[], int width, int height, int depth)
 {

-    Init();
-
+#ifndef __WXMICROWIN__

     wxBitmapRefData *refData = new wxBitmapRefData;
     m_refData = refData;
 
     refData->m_width = width;
     refData->m_height = height;
     refData->m_depth = depth;
     wxBitmapRefData *refData = new wxBitmapRefData;
     m_refData = refData;
 
     refData->m_width = width;
     refData->m_height = height;
     refData->m_depth = depth;

-    refData->m_numColors = 0;
-    refData->m_selectedInto = NULL;

 
     char *data;
     if ( depth == 1 )
     {
         // we assume that it is in XBM format which is not quite the same as
         // the format CreateBitmap() wants because the order of bytes in the
 
     char *data;
     if ( depth == 1 )
     {
         // we assume that it is in XBM format which is not quite the same as
         // the format CreateBitmap() wants because the order of bytes in the

-        // line is inversed!
-        static const size_t bytesPerLine = (width + 7) / 8;
-        static const size_t padding = bytesPerLine % 2;
-        static const size_t len = height * ( padding + bytesPerLine );
+        // line is reversed!
+        const size_t bytesPerLine = (width + 7) / 8;
+        const size_t padding = bytesPerLine % 2;
+        const size_t len = height * ( padding + bytesPerLine );

         data = (char *)malloc(len);
         const char *src = bits;
         char *dst = data;
 
         for ( int rows = 0; rows < height; rows++ )
         {
         data = (char *)malloc(len);
         const char *src = bits;
         char *dst = data;
 
         for ( int rows = 0; rows < height; rows++ )
         {

-            // note that offset cannot be size_t due to >= 0 test!
-            for ( int offset = bytesPerLine - 1; offset >= 0; offset-- )
+            for ( size_t cols = 0; cols < bytesPerLine; cols++ )

             {
             {

-                *dst++ = *(src + offset);
+                unsigned char val = *src++;
+                unsigned char reversed = 0;
+
+                for ( int bits = 0; bits < 8; bits++)
+                {
+                    reversed <<= 1;
+                    reversed |= (unsigned char)(val & 0x01);
+                    val >>= 1;
+                }
+                *dst++ = reversed;

             }
 
             if ( padding )
                 *dst++ = 0;
             }
 
             if ( padding )
                 *dst++ = 0;

-
-            src += bytesPerLine;

         }
     }
     else
         }
     }
     else


@@ -276,7 +460,7 @@ wxBitmap::wxBitmap(const char bits[], int width, int height, int depth)
     HBITMAP hbmp = ::CreateBitmap(width, height, 1, depth, data);
     if ( !hbmp )
     {
     HBITMAP hbmp = ::CreateBitmap(width, height, 1, depth, data);
     if ( !hbmp )
     {

-        wxLogLastError("CreateBitmap");
+        wxLogLastError(wxT("CreateBitmap"));

     }
 
     if ( data != bits )
     }
 
     if ( data != bits )


@@ -285,118 +469,518 @@ wxBitmap::wxBitmap(const char bits[], int width, int height, int depth)
     }
 
     SetHBITMAP((WXHBITMAP)hbmp);
     }
 
     SetHBITMAP((WXHBITMAP)hbmp);

+#endif

 }
 
 }
 

-// GRG, Dic/99
-wxBitmap wxBitmap::GetSubBitmap( const wxRect& rect) const
+// Create from XPM data
+bool wxBitmap::CreateFromXpm(const char **data)

 {
 {

-    wxCHECK_MSG( Ok() &&
-                 (rect.x >= 0) && (rect.y >= 0) &&
-                 (rect.x+rect.width <= GetWidth()) &&
-                 (rect.y+rect.height <= GetHeight()),
-                 wxNullBitmap, wxT("Invalid bitmap or bitmap region") );
+#if wxUSE_IMAGE && wxUSE_XPM && wxUSE_WXDIB
+    wxCHECK_MSG( data != NULL, false, wxT("invalid bitmap data") )

 
 

-    wxBitmap ret( rect.width, rect.height, GetDepth() );
-    wxASSERT_MSG( ret.Ok(), wxT("GetSubBitmap error") );
+    wxXPMDecoder decoder;
+    wxImage img = decoder.ReadData(data);
+    wxCHECK_MSG( img.Ok(), false, wxT("invalid bitmap data") )

 
 

-    // copy bitmap data
-    HDC dcSrc = ::CreateCompatibleDC(NULL);
-    HDC dcDst = ::CreateCompatibleDC(NULL);
-    SelectObject(dcSrc, (HBITMAP) GetHBITMAP());
-    SelectObject(dcDst, (HBITMAP) ret.GetHBITMAP());
-    BitBlt(dcDst, 0, 0, rect.width, rect.height, dcSrc, rect.x, rect.y, SRCCOPY);
+    *this = wxBitmap(img);
+    return true;
+#else
+    wxUnusedVar(data);
+    return false;
+#endif
+}

 
 

-    // copy mask if there is one
-    if (GetMask())
+wxBitmap::wxBitmap(int w, int h, int d)
+{
+    (void)Create(w, h, d);
+}
+
+wxBitmap::wxBitmap(int w, int h, const wxDC& dc)
+{
+    (void)Create(w, h, dc);
+}
+
+wxBitmap::wxBitmap(void *data, long type, int width, int height, int depth)
+{
+    (void)Create(data, type, width, height, depth);
+}
+
+wxBitmap::wxBitmap(const wxString& filename, wxBitmapType type)
+{
+    LoadFile(filename, (int)type);
+}
+
+bool wxBitmap::Create(int width, int height, int depth)
+{
+    return DoCreate(width, height, depth, 0);
+}
+
+bool wxBitmap::Create(int width, int height, const wxDC& dc)
+{
+    wxCHECK_MSG( dc.Ok(), false, _T("invalid HDC in wxBitmap::Create()") );
+
+    return DoCreate(width, height, -1, dc.GetHDC());
+}
+
+bool wxBitmap::DoCreate(int w, int h, int d, WXHDC hdc)
+{
+    UnRef();
+
+    m_refData = new wxBitmapRefData;
+
+    GetBitmapData()->m_width = w;
+    GetBitmapData()->m_height = h;
+
+    HBITMAP hbmp    wxDUMMY_INITIALIZE(0);
+
+#ifndef NEVER_USE_DIB
+    if ( wxShouldCreateDIB(w, h, d, hdc) )

     {
     {

-        HBITMAP hbmpMask = ::CreateBitmap(rect.width, rect.height, 1, 1, 0);
+        if ( d == -1 )
+        {
+            // create DIBs without alpha channel by default
+            d = 24;
+        }

 
 

-        SelectObject(dcSrc, (HBITMAP) GetMask()->GetMaskBitmap());
-        SelectObject(dcDst, (HBITMAP) hbmpMask);
-        BitBlt(dcDst, 0, 0, rect.width, rect.height, dcSrc, rect.x, rect.y, SRCCOPY);
+        wxDIB dib(w, h, d);
+        if ( !dib.IsOk() )
+           return false;

 
 

-        wxMask *mask = new wxMask((WXHBITMAP) hbmpMask);
-        ret.SetMask(mask);
+        // don't delete the DIB section in dib object dtor
+        hbmp = dib.Detach();
+
+        GetBitmapData()->m_isDIB = true;
+        GetBitmapData()->m_depth = d;

     }
     }

+    else // create a DDB
+#endif // NEVER_USE_DIB
+    {
+#ifndef ALWAYS_USE_DIB
+#ifndef __WXMICROWIN__
+        if ( d > 0 )
+        {
+            hbmp = ::CreateBitmap(w, h, 1, d, NULL);
+            if ( !hbmp )
+            {
+                wxLogLastError(wxT("CreateBitmap"));
+            }

 
 

-    SelectObject(dcDst, NULL);
-    SelectObject(dcSrc, NULL);
-    DeleteDC(dcDst);
-    DeleteDC(dcSrc);
+            GetBitmapData()->m_depth = d;
+        }
+        else // d == 0, create bitmap compatible with the screen
+#endif // !__WXMICROWIN__
+        {
+            ScreenHDC dc;
+            hbmp = ::CreateCompatibleBitmap(dc, w, h);
+            if ( !hbmp )
+            {
+                wxLogLastError(wxT("CreateCompatibleBitmap"));
+            }

 
 

-    return ret;
+            GetBitmapData()->m_depth = wxDisplayDepth();
+        }
+#endif // !ALWAYS_USE_DIB
+    }
+
+    SetHBITMAP((WXHBITMAP)hbmp);
+
+    return Ok();

 }
 
 }
 

-// Create from XPM data
-wxBitmap::wxBitmap(char **data, wxControl *WXUNUSED(anItem))
+#if wxUSE_IMAGE
+
+// ----------------------------------------------------------------------------
+// wxImage to/from conversions for Microwin
+// ----------------------------------------------------------------------------
+
+// Microwin versions are so different from normal ones that it really doesn't
+// make sense to use #ifdefs inside the function bodies
+#ifdef __WXMICROWIN__
+
+bool wxBitmap::CreateFromImage(const wxImage& image, int depth, const wxDC& dc)

 {
 {

-    Init();
+    // Set this to 1 to experiment with mask code,
+    // which currently doesn't work
+    #define USE_MASKS 0
+
+    m_refData = new wxBitmapRefData();
+
+    // Initial attempt at a simple-minded implementation.
+    // The bitmap will always be created at the screen depth,
+    // so the 'depth' argument is ignored.
+
+    HDC hScreenDC = ::GetDC(NULL);
+    int screenDepth = ::GetDeviceCaps(hScreenDC, BITSPIXEL);
+
+    HBITMAP hBitmap = ::CreateCompatibleBitmap(hScreenDC, image.GetWidth(), image.GetHeight());
+    HBITMAP hMaskBitmap = NULL;
+    HBITMAP hOldMaskBitmap = NULL;
+    HDC hMaskDC = NULL;
+    unsigned char maskR = 0;
+    unsigned char maskG = 0;
+    unsigned char maskB = 0;

 
 

-    (void)Create((void *)data, wxBITMAP_TYPE_XPM_DATA, 0, 0, 0);
+    //    printf("Created bitmap %d\n", (int) hBitmap);
+    if (hBitmap == NULL)
+    {
+        ::ReleaseDC(NULL, hScreenDC);
+        return false;
+    }
+    HDC hMemDC = ::CreateCompatibleDC(hScreenDC);
+
+    HBITMAP hOldBitmap = ::SelectObject(hMemDC, hBitmap);
+    ::ReleaseDC(NULL, hScreenDC);
+
+    // created an mono-bitmap for the possible mask
+    bool hasMask = image.HasMask();
+
+    if ( hasMask )
+    {
+#if USE_MASKS
+        // FIXME: we should be able to pass bpp = 1, but
+        // GdBlit can't handle a different depth
+#if 0
+        hMaskBitmap = ::CreateBitmap( (WORD)image.GetWidth(), (WORD)image.GetHeight(), 1, 1, NULL );
+#else
+        hMaskBitmap = ::CreateCompatibleBitmap( hMemDC, (WORD)image.GetWidth(), (WORD)image.GetHeight());
+#endif
+        maskR = image.GetMaskRed();
+        maskG = image.GetMaskGreen();
+        maskB = image.GetMaskBlue();
+
+        if (!hMaskBitmap)
+        {
+            hasMask = false;
+        }
+        else
+        {
+            hScreenDC = ::GetDC(NULL);
+            hMaskDC = ::CreateCompatibleDC(hScreenDC);
+           ::ReleaseDC(NULL, hScreenDC);
+
+            hOldMaskBitmap = ::SelectObject( hMaskDC, hMaskBitmap);
+        }
+#else
+        hasMask = false;
+#endif
+    }
+
+    int i, j;
+    for (i = 0; i < image.GetWidth(); i++)
+    {
+        for (j = 0; j < image.GetHeight(); j++)
+        {
+            unsigned char red = image.GetRed(i, j);
+            unsigned char green = image.GetGreen(i, j);
+            unsigned char blue = image.GetBlue(i, j);
+
+            ::SetPixel(hMemDC, i, j, PALETTERGB(red, green, blue));
+
+            if (hasMask)
+            {
+                // scan the bitmap for the transparent colour and set the corresponding
+                // pixels in the mask to BLACK and the rest to WHITE
+                if (maskR == red && maskG == green && maskB == blue)
+                    ::SetPixel(hMaskDC, i, j, PALETTERGB(0, 0, 0));
+                else
+                    ::SetPixel(hMaskDC, i, j, PALETTERGB(255, 255, 255));
+            }
+        }
+    }
+
+    ::SelectObject(hMemDC, hOldBitmap);
+    ::DeleteDC(hMemDC);
+    if (hasMask)
+    {
+        ::SelectObject(hMaskDC, hOldMaskBitmap);
+        ::DeleteDC(hMaskDC);
+
+        ((wxBitmapRefData*)m_refData)->SetMask(hMaskBitmap);
+    }
+
+    SetWidth(image.GetWidth());
+    SetHeight(image.GetHeight());
+    SetDepth(screenDepth);
+    SetHBITMAP( (WXHBITMAP) hBitmap );
+
+#if wxUSE_PALETTE
+    // Copy the palette from the source image
+    SetPalette(image.GetPalette());
+#endif // wxUSE_PALETTE
+
+    return true;

 }
 
 }
 

-wxBitmap::wxBitmap(int w, int h, int d)
+wxImage wxBitmap::ConvertToImage() const

 {
 {

-    Init();
+    // Initial attempt at a simple-minded implementation.
+    // The bitmap will always be created at the screen depth,
+    // so the 'depth' argument is ignored.
+    // TODO: transparency (create a mask image)

 
 

-    (void)Create(w, h, d);
+    if (!Ok())
+    {
+        wxFAIL_MSG( wxT("bitmap is invalid") );
+        return wxNullImage;
+    }
+
+    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();
+    if( !data )
+    {
+        wxFAIL_MSG( wxT("could not allocate data for image") );
+        return wxNullImage;
+    }
+
+    HDC hScreenDC = ::GetDC(NULL);
+
+    HDC hMemDC = ::CreateCompatibleDC(hScreenDC);
+    ::ReleaseDC(NULL, hScreenDC);
+
+    HBITMAP hBitmap = (HBITMAP) GetHBITMAP();
+
+    HBITMAP hOldBitmap = ::SelectObject(hMemDC, hBitmap);
+
+    int i, j;
+    for (i = 0; i < GetWidth(); i++)
+    {
+        for (j = 0; j < GetHeight(); j++)
+        {
+            COLORREF color = ::GetPixel(hMemDC, i, j);
+            unsigned char red = GetRValue(color);
+            unsigned char green = GetGValue(color);
+            unsigned char blue = GetBValue(color);
+
+            image.SetRGB(i, j, red, green, blue);
+        }
+    }
+
+    ::SelectObject(hMemDC, hOldBitmap);
+    ::DeleteDC(hMemDC);
+
+#if wxUSE_PALETTE
+    // Copy the palette from the source image
+    if (GetPalette())
+        image.SetPalette(* GetPalette());
+#endif // wxUSE_PALETTE
+
+    return image;

 }
 
 }
 

-wxBitmap::wxBitmap(void *data, long type, int width, int height, int depth)
-{
-    Init();
+#endif // __WXMICROWIN__

 
 

-    (void)Create(data, type, width, height, depth);
+// ----------------------------------------------------------------------------
+// wxImage to/from conversions
+// ----------------------------------------------------------------------------
+
+#if wxUSE_WXDIB
+
+bool wxBitmap::CreateFromImage(const wxImage& image, int depth)
+{
+    return CreateFromImage(image, depth, 0);

 }
 
 }
 

-wxBitmap::wxBitmap(const wxString& filename, long type)
+bool wxBitmap::CreateFromImage(const wxImage& image, const wxDC& dc)

 {
 {

-    Init();
+    wxCHECK_MSG( dc.Ok(), false,
+                    _T("invalid HDC in wxBitmap::CreateFromImage()") );

 
 

-    LoadFile(filename, (int)type);
+    return CreateFromImage(image, -1, dc.GetHDC());

 }
 
 }
 

-bool wxBitmap::Create(int w, int h, int d)
+bool wxBitmap::CreateFromImage(const wxImage& image, int depth, WXHDC hdc)

 {
 {

+    wxCHECK_MSG( image.Ok(), false, wxT("invalid image") );
+

     UnRef();
 
     UnRef();
 

-    m_refData = new wxBitmapRefData;
+    // first convert the image to DIB
+    const int h = image.GetHeight();
+    const int w = image.GetWidth();

 
 

-    GetBitmapData()->m_width = w;
-    GetBitmapData()->m_height = h;
-    GetBitmapData()->m_depth = d;
+    wxDIB dib(image);
+    if ( !dib.IsOk() )
+        return false;
+       if (depth == -1)
+               depth = dib.GetDepth(); // Get depth from image if none specified

 
 

-    HBITMAP hbmp;
+    // store the bitmap parameters
+    wxBitmapRefData *refData = new wxBitmapRefData;
+    refData->m_width = w;
+    refData->m_height = h;
+    refData->m_hasAlpha = image.HasAlpha();
+
+    m_refData = refData;

 
 

-    if ( d > 0 )
+
+    // next either store DIB as is or create a DDB from it
+    HBITMAP hbitmap     wxDUMMY_INITIALIZE(0);
+
+    // are we going to use DIB?
+    //
+    // NB: DDBs don't support alpha so if we have alpha channel we must use DIB
+    if ( image.HasAlpha() || wxShouldCreateDIB(w, h, depth, hdc) )

     {
     {

-        hbmp = ::CreateBitmap(w, h, 1, d, NULL);
-        if ( !hbmp )
-        {
-            wxLogLastError("CreateBitmap");
-        }
+        // don't delete the DIB section in dib object dtor
+        hbitmap = dib.Detach();
+
+        refData->m_isDIB = true;
+        refData->m_depth = depth;

     }
     }

-    else
+#ifndef ALWAYS_USE_DIB
+    else // we need to convert DIB to DDB
+    {
+        hbitmap = dib.CreateDDB((HDC)hdc);
+
+        refData->m_depth = depth;
+    }
+#endif // !ALWAYS_USE_DIB
+
+    // validate this object
+    SetHBITMAP((WXHBITMAP)hbitmap);
+
+    // finally also set the mask if we have one
+    if ( image.HasMask() )

     {
     {

-        ScreenHDC dc;
-        hbmp = ::CreateCompatibleBitmap(dc, w, h);
-        if ( !hbmp )
+        const size_t len  = 2*((w+15)/16);
+        BYTE *src  = image.GetData();
+        BYTE *data = new BYTE[h*len];
+        memset(data, 0, h*len);
+        BYTE r = image.GetMaskRed(),
+             g = image.GetMaskGreen(),
+             b = image.GetMaskBlue();
+        BYTE *dst = data;
+        for ( int y = 0; y < h; y++, dst += len )

         {
         {

-            wxLogLastError("CreateCompatibleBitmap");
+            BYTE *dstLine = dst;
+            BYTE mask = 0x80;
+            for ( int x = 0; x < w; x++, src += 3 )
+            {
+                if (src[0] != r || src[1] != g || src[2] != b)
+                    *dstLine |= mask;
+
+                if ( (mask >>= 1) == 0 )
+                {
+                    dstLine++;
+                    mask = 0x80;
+                }
+            }
+        }
+
+        hbitmap = ::CreateBitmap(w, h, 1, 1, data);
+        if ( !hbitmap )
+        {
+            wxLogLastError(_T("CreateBitmap(mask)"));
+        }
+        else
+        {
+            SetMask(new wxMask((WXHBITMAP)hbitmap));

         }
 
         }
 

-        GetBitmapData()->m_depth = wxDisplayDepth();
+        delete[] data;

     }
 
     }
 

-    SetHBITMAP((WXHBITMAP)hbmp);
+    return true;
+}

 
 

-#if WXWIN_COMPATIBILITY_2
-    GetBitmapData()->m_ok = hbmp != 0;
-#endif // WXWIN_COMPATIBILITY_2
+wxImage wxBitmap::ConvertToImage() const
+{
+    // convert DDB to DIB
+    wxDIB dib(*this);

 
 

-    return Ok();
+    if ( !dib.IsOk() )
+    {
+        return wxNullImage;
+    }
+
+    // and then DIB to our wxImage
+    wxImage image = dib.ConvertToImage();
+    if ( !image.Ok() )
+    {
+        return wxNullImage;
+    }
+
+    // now do the same for the mask, if we have any
+    HBITMAP hbmpMask = GetMask() ? (HBITMAP) GetMask()->GetMaskBitmap() : NULL;
+    if ( hbmpMask )
+    {
+        wxDIB dibMask(hbmpMask);
+        if ( dibMask.IsOk() )
+        {
+            // TODO: use wxRawBitmap to iterate over DIB
+
+            // we hard code the mask colour for now but we could also make an
+            // effort (and waste time) to choose a colour not present in the
+            // image already to avoid having to fudge the pixels below --
+            // whether it's worth to do it is unclear however
+            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;
+
+            const int h = dibMask.GetHeight();
+            const int w = dibMask.GetWidth();
+            const int bpp = dibMask.GetDepth();
+            const int maskBytesPerPixel = bpp >> 3;
+            const int maskBytesPerLine = wxDIB::GetLineSize(w, bpp);
+            unsigned char *data = image.GetData();
+
+            // remember that DIBs are stored in bottom to top order
+            unsigned char *
+                maskLineStart = dibMask.GetData() + ((h - 1) * maskBytesPerLine);
+
+            for ( int y = 0; y < h; y++, maskLineStart -= maskBytesPerLine )
+            {
+                // traverse one mask DIB line
+                unsigned char *mask = maskLineStart;
+                for ( int x = 0; x < w; x++, mask += maskBytesPerPixel )
+                {
+                    // should this pixel be transparent?
+                    if ( *mask )
+                    {
+                        // no, check that it isn't transparent by accident
+                        if ( (data[0] == MASK_RED) &&
+                                (data[1] == MASK_GREEN) &&
+                                    (data[2] == MASK_BLUE) )
+                        {
+                            // we have to fudge the colour a bit to prevent
+                            // this pixel from appearing transparent
+                            data[2] = MASK_BLUE_REPLACEMENT;
+                        }
+
+                        data += 3;
+                    }
+                    else // yes, transparent pixel
+                    {
+                        *data++ = MASK_RED;
+                        *data++ = MASK_GREEN;
+                        *data++ = MASK_BLUE;
+                    }
+                }
+            }
+
+            image.SetMaskColour(MASK_RED, MASK_GREEN, MASK_BLUE);
+        }
+    }
+
+    return image;

 }
 
 }
 

+#endif // wxUSE_WXDIB
+
+#endif // wxUSE_IMAGE
+
+// ----------------------------------------------------------------------------
+// loading and saving bitmaps
+// ----------------------------------------------------------------------------
+

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


@@ -409,16 +993,20 @@ bool wxBitmap::LoadFile(const wxString& filename, long type)
 
         return handler->LoadFile(this, filename, type, -1, -1);
     }
 
         return handler->LoadFile(this, filename, type, -1, -1);
     }

-    else
+#if wxUSE_IMAGE && wxUSE_WXDIB
+    else // no bitmap handler found

     {
         wxImage image;
     {
         wxImage image;

-        if ( !image.LoadFile( filename, type ) || !image.Ok() )
-            return FALSE;
-
-        *this = image.ConvertToBitmap();
+        if ( image.LoadFile( filename, type ) && image.Ok() )
+        {
+            *this = wxBitmap(image);

 
 

-        return TRUE;
+            return true;
+        }

     }
     }

+#endif // wxUSE_IMAGE
+
+    return false;

 }
 
 bool wxBitmap::Create(void *data, long type, int width, int height, int depth)
 }
 
 bool wxBitmap::Create(void *data, long type, int width, int height, int depth)


@@ -429,10 +1017,9 @@ bool wxBitmap::Create(void *data, long type, int width, int height, int depth)
 
     if ( !handler )
     {
 
     if ( !handler )
     {

-        wxLogDebug(wxT("Failed to create bitmap: no bitmap handler for "
-                       "type %d defined."), type);
+        wxLogDebug(wxT("Failed to create bitmap: no bitmap handler for type %ld defined."), type);

 
 

-        return FALSE;
+        return false;

     }
 
     m_refData = new wxBitmapRefData;
     }
 
     m_refData = new wxBitmapRefData;


@@ -440,7 +1027,9 @@ bool wxBitmap::Create(void *data, long type, int width, int height, int depth)
     return handler->Create(this, data, type, width, height, depth);
 }
 
     return handler->Create(this, data, type, width, height, depth);
 }
 

-bool wxBitmap::SaveFile(const wxString& filename, int type, const wxPalette *palette)
+bool wxBitmap::SaveFile(const wxString& filename,
+                        int type,
+                        const wxPalette *palette)

 {
     wxBitmapHandler *handler = wxDynamicCast(FindHandler(type), wxBitmapHandler);
 
 {
     wxBitmapHandler *handler = wxDynamicCast(FindHandler(type), wxBitmapHandler);
 


@@ -448,103 +1037,290 @@ bool wxBitmap::SaveFile(const wxString& filename, int type, const wxPalette *pal
     {
         return handler->SaveFile(this, filename, type, palette);
     }
     {
         return handler->SaveFile(this, filename, type, palette);
     }

-    else
+#if wxUSE_IMAGE && wxUSE_WXDIB
+    else // no bitmap handler found

     {
         // FIXME what about palette? shouldn't we use it?
     {
         // FIXME what about palette? shouldn't we use it?

-        wxImage image( *this );
-        if (!image.Ok())
-            return FALSE;
+        wxImage image = ConvertToImage();
+        if ( image.Ok() )
+        {
+            return image.SaveFile(filename, type);
+        }
+    }
+#endif // wxUSE_IMAGE

 
 

-        return image.SaveFile( filename, type );
+    return false;
+}
+
+// ----------------------------------------------------------------------------
+// sub bitmap extraction
+// ----------------------------------------------------------------------------
+
+wxBitmap wxBitmap::GetSubBitmap( const wxRect& rect) const
+{
+    wxCHECK_MSG( Ok() &&
+                 (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.Ok(), wxT("GetSubBitmap error") );
+
+#ifndef __WXMICROWIN__
+    // handle alpha channel, if any
+    if (HasAlpha())
+        ret.UseAlpha();
+
+    // copy bitmap data
+    MemoryHDC dcSrc,
+              dcDst;
+
+    {
+        SelectInHDC selectSrc(dcSrc, GetHbitmap()),
+                    selectDst(dcDst, GetHbitmapOf(ret));
+
+        if ( !selectSrc || !selectDst )
+        {
+            wxLogLastError(_T("SelectObjct(hBitmap)"));
+        }
+
+        if ( !::BitBlt(dcDst, 0, 0, rect.width, rect.height,
+                       dcSrc, rect.x, rect.y, SRCCOPY) )
+        {
+            wxLogLastError(_T("BitBlt"));
+        }

     }
     }

+
+    // copy mask if there is one
+    if ( GetMask() )
+    {
+        HBITMAP hbmpMask = ::CreateBitmap(rect.width, rect.height, 1, 1, 0);
+
+        SelectInHDC selectSrc(dcSrc, (HBITMAP) GetMask()->GetMaskBitmap()),
+                    selectDst(dcDst, hbmpMask);
+
+        if ( !::BitBlt(dcDst, 0, 0, rect.width, rect.height,
+                       dcSrc, rect.x, rect.y, SRCCOPY) )
+        {
+            wxLogLastError(_T("BitBlt"));
+        }
+
+        wxMask *mask = new wxMask((WXHBITMAP) hbmpMask);
+        ret.SetMask(mask);
+    }
+#endif // !__WXMICROWIN__
+
+    return ret;

 }
 
 // ----------------------------------------------------------------------------
 // wxBitmap accessors
 // ----------------------------------------------------------------------------
 
 }
 
 // ----------------------------------------------------------------------------
 // wxBitmap accessors
 // ----------------------------------------------------------------------------
 

-void wxBitmap::SetQuality(int q)
+#if wxUSE_PALETTE
+wxPalette* wxBitmap::GetPalette() const

 {
 {

-    EnsureHasData();
+    return GetBitmapData() ? &GetBitmapData()->m_bitmapPalette
+                           : (wxPalette *) NULL;
+}
+#endif

 
 

-    GetBitmapData()->m_quality = q;
+wxMask *wxBitmap::GetMask() const
+{
+    return GetBitmapData() ? GetBitmapData()->GetMask() : (wxMask *) NULL;

 }
 
 }
 

-#if WXWIN_COMPATIBILITY_2
-void wxBitmap::SetOk(bool isOk)
+wxBitmap wxBitmap::GetMaskBitmap() const

 {
 {

-    EnsureHasData();
+    wxBitmap bmp;
+    wxMask *mask = GetMask();
+    if ( mask )
+        bmp.SetHBITMAP(mask->GetMaskBitmap());
+    return bmp;
+}
+
+#ifdef __WXDEBUG__

 
 

-    GetBitmapData()->m_ok = isOk;
+wxDC *wxBitmap::GetSelectedInto() const
+{
+    return GetBitmapData() ? GetBitmapData()->m_selectedInto : (wxDC *) NULL;

 }
 }

-#endif // WXWIN_COMPATIBILITY_2
+
+#endif
+
+#if WXWIN_COMPATIBILITY_2_4
+
+int wxBitmap::GetQuality() const
+{
+    return 0;
+}
+
+#endif // WXWIN_COMPATIBILITY_2_4
+
+void wxBitmap::UseAlpha()
+{
+    if ( GetBitmapData() )
+        GetBitmapData()->m_hasAlpha = true;
+}
+
+bool wxBitmap::HasAlpha() const
+{
+    return GetBitmapData() && GetBitmapData()->m_hasAlpha;
+}
+
+// ----------------------------------------------------------------------------
+// wxBitmap setters
+// ----------------------------------------------------------------------------
+
+#ifdef __WXDEBUG__
+
+void wxBitmap::SetSelectedInto(wxDC *dc)
+{
+    if ( GetBitmapData() )
+        GetBitmapData()->m_selectedInto = dc;
+}
+
+#endif
+
+#if wxUSE_PALETTE

 
 void wxBitmap::SetPalette(const wxPalette& palette)
 {
 
 void wxBitmap::SetPalette(const wxPalette& palette)
 {

-    EnsureHasData();
+    AllocExclusive();

 
     GetBitmapData()->m_bitmapPalette = palette;
 }
 
 
     GetBitmapData()->m_bitmapPalette = palette;
 }
 

+#endif // wxUSE_PALETTE
+

 void wxBitmap::SetMask(wxMask *mask)
 {
 void wxBitmap::SetMask(wxMask *mask)
 {

-    EnsureHasData();
+    AllocExclusive();

 
 

-    GetBitmapData()->m_bitmapMask = mask;
+    GetBitmapData()->SetMask(mask);

 }
 
 }
 

-// Creates a bitmap that matches the device context, from
-// an arbitray bitmap. At present, the original bitmap must have an
-// associated palette. TODO: use a default palette if no palette exists.
-// Contributed by Frederic Villeneuve <frederic.villeneuve@natinst.com>
-wxBitmap wxBitmap::GetBitmapForDC(wxDC& dc) const
+#if WXWIN_COMPATIBILITY_2_4
+
+void wxBitmap::SetQuality(int WXUNUSED(quality))
+{
+}
+
+#endif // WXWIN_COMPATIBILITY_2_4
+
+// ----------------------------------------------------------------------------
+// raw bitmap access support
+// ----------------------------------------------------------------------------
+
+#ifdef wxHAVE_RAW_BITMAP
+void *wxBitmap::GetRawData(wxPixelDataBase& data, int bpp)

 {
 {

-    wxMemoryDC      memDC;
-    wxBitmap        tmpBitmap(this->GetWidth(), this->GetHeight(), dc.GetDepth());
-    HPALETTE        hPal = (HPALETTE) NULL;
-    LPBITMAPINFO    lpDib;
-    void            *lpBits = (void*) NULL;
+#if wxUSE_WXDIB
+    if ( !Ok() )
+    {
+        // no bitmap, no data (raw or otherwise)
+        return NULL;
+    }

 
 

-    if( GetPalette() && GetPalette()->Ok() )
+    // if we're already a DIB we can access our data directly, but if not we
+    // need to convert this DDB to a DIB section and use it for raw access and
+    // then convert it back
+    HBITMAP hDIB;
+    if ( !GetBitmapData()->m_isDIB )

     {
     {

-        tmpBitmap.SetPalette(*GetPalette());
-        memDC.SelectObject(tmpBitmap);
-        memDC.SetPalette(*GetPalette());
-        hPal = (HPALETTE)GetPalette()->GetHPALETTE();
+        wxCHECK_MSG( !GetBitmapData()->m_dib, NULL,
+                        _T("GetRawData() may be called only once") );
+
+        wxDIB *dib = new wxDIB(*this);
+        if ( !dib->IsOk() )
+        {
+            delete dib;
+
+            return NULL;
+        }
+
+        // we'll free it in UngetRawData()
+        GetBitmapData()->m_dib = dib;
+
+        hDIB = dib->GetHandle();

     }
     }

-    else
+    else // we're a DIB

     {
     {

-        hPal = (HPALETTE) ::GetStockObject(DEFAULT_PALETTE);
-        wxPalette palette;
-        palette.SetHPALETTE( (WXHPALETTE)hPal );
-        tmpBitmap.SetPalette( palette );
-        memDC.SelectObject(tmpBitmap);
-        memDC.SetPalette( palette );
+        hDIB = GetHbitmap();

     }
 
     }
 

-    // set the height negative because in a DIB the order of the lines is
-    // reversed
-    if ( !wxCreateDIB(GetWidth(), -GetHeight(), GetDepth(), hPal, &lpDib) )
+    DIBSECTION ds;
+    if ( ::GetObject(hDIB, sizeof(ds), &ds) != sizeof(DIBSECTION) )

     {
     {

-        return wxNullBitmap;
+        wxFAIL_MSG( _T("failed to get DIBSECTION from a DIB?") );
+
+        return NULL;

     }
 
     }
 

-    lpBits = malloc(lpDib->bmiHeader.biSizeImage);
+    // check that the bitmap is in correct format
+    if ( ds.dsBm.bmBitsPixel != bpp )
+    {
+        wxFAIL_MSG( _T("incorrect bitmap type in wxBitmap::GetRawData()") );

 
 

-    ::GetBitmapBits(GetHbitmap(), lpDib->bmiHeader.biSizeImage, lpBits);
+        return NULL;
+    }

 
 

-    ::SetDIBitsToDevice(GetHdcOf(memDC), 0, 0,
-                        GetWidth(), GetHeight(),
-                        0, 0, 0, GetHeight(),
-                        lpBits, lpDib, DIB_RGB_COLORS);
+    // ok, store the relevant info in wxPixelDataBase
+    const LONG h = ds.dsBm.bmHeight;

 
 

-    free(lpBits);
+    data.m_width = ds.dsBm.bmWidth;
+    data.m_height = h;

 
 

-    wxFreeDIB(lpDib);
+    // remember that DIBs are stored in top to bottom order!
+    // (We can't just use ds.dsBm.bmWidthBytes here, because it isn't always a
+    // multiple of 2, as required by the documentation.  So we use the official
+    // formula, which we already use elsewhere.)
+    const LONG bytesPerRow =
+        wxDIB::GetLineSize(ds.dsBm.bmWidth, ds.dsBm.bmBitsPixel);
+    data.m_stride = -bytesPerRow;

 
 

-    return tmpBitmap;
+    char *bits = (char *)ds.dsBm.bmBits;
+    if ( h > 1 )
+    {
+        bits += (h - 1)*bytesPerRow;
+    }
+
+    return bits;
+#else
+    return NULL;
+#endif

 }
 
 }
 

+void wxBitmap::UngetRawData(wxPixelDataBase& dataBase)
+{
+#if wxUSE_WXDIB
+    if ( !Ok() )
+        return;
+
+    if ( !&dataBase )
+    {
+        // invalid data, don't crash -- but don't assert neither as we're
+        // called automatically from wxPixelDataBase dtor and so there is no
+        // way to prevent this from happening
+        return;
+    }
+
+    // if we're a DDB we need to convert DIB back to DDB now to make the
+    // changes made via raw bitmap access effective
+    if ( !GetBitmapData()->m_isDIB )
+    {
+        wxDIB *dib = GetBitmapData()->m_dib;
+        GetBitmapData()->m_dib = NULL;
+
+        // TODO: convert
+
+        delete dib;
+    }
+#endif // wxUSE_WXDIB
+}
+#endif // #ifdef wxHAVE_RAW_BITMAP
+

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


@@ -586,15 +1362,16 @@ wxMask::~wxMask()
 // Create a mask from a mono bitmap (copies the bitmap).
 bool wxMask::Create(const wxBitmap& bitmap)
 {
 // Create a mask from a mono bitmap (copies the bitmap).
 bool wxMask::Create(const wxBitmap& bitmap)
 {

+#ifndef __WXMICROWIN__
+    wxCHECK_MSG( bitmap.Ok() && bitmap.GetDepth() == 1, false,
+                 _T("can't create mask from invalid or not monochrome bitmap") );
+

     if ( m_maskBitmap )
     {
         ::DeleteObject((HBITMAP) m_maskBitmap);
         m_maskBitmap = 0;
     }
     if ( m_maskBitmap )
     {
         ::DeleteObject((HBITMAP) m_maskBitmap);
         m_maskBitmap = 0;
     }

-    if (!bitmap.Ok() || bitmap.GetDepth() != 1)
-    {
-        return FALSE;
-    }
+

     m_maskBitmap = (WXHBITMAP) CreateBitmap(
                                             bitmap.GetWidth(),
                                             bitmap.GetHeight(),
     m_maskBitmap = (WXHBITMAP) CreateBitmap(
                                             bitmap.GetWidth(),
                                             bitmap.GetHeight(),


@@ -609,7 +1386,11 @@ bool wxMask::Create(const wxBitmap& bitmap)
     DeleteDC(srcDC);
     SelectObject(destDC, 0);
     DeleteDC(destDC);
     DeleteDC(srcDC);
     SelectObject(destDC, 0);
     DeleteDC(destDC);

-    return TRUE;
+    return true;
+#else
+    wxUnusedVar(bitmap);
+    return false;
+#endif

 }
 
 // Create a mask from a bitmap and a palette index indicating
 }
 
 // Create a mask from a bitmap and a palette index indicating


@@ -621,6 +1402,8 @@ bool wxMask::Create(const wxBitmap& bitmap, int paletteIndex)
         ::DeleteObject((HBITMAP) m_maskBitmap);
         m_maskBitmap = 0;
     }
         ::DeleteObject((HBITMAP) m_maskBitmap);
         m_maskBitmap = 0;
     }

+
+#if wxUSE_PALETTE

     if (bitmap.Ok() && bitmap.GetPalette()->Ok())
     {
         unsigned char red, green, blue;
     if (bitmap.Ok() && bitmap.GetPalette()->Ok())
     {
         unsigned char red, green, blue;


@@ -630,59 +1413,81 @@ bool wxMask::Create(const wxBitmap& bitmap, int paletteIndex)
             return Create(bitmap, transparentColour);
         }
     }
             return Create(bitmap, transparentColour);
         }
     }

-    return FALSE;
+#endif // wxUSE_PALETTE
+
+    return false;

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

+#ifndef __WXMICROWIN__
+    wxCHECK_MSG( bitmap.Ok(), false, _T("invalid bitmap in wxMask::Create") );
+

     if ( m_maskBitmap )
     {
         ::DeleteObject((HBITMAP) m_maskBitmap);
         m_maskBitmap = 0;
     }
     if ( m_maskBitmap )
     {
         ::DeleteObject((HBITMAP) m_maskBitmap);
         m_maskBitmap = 0;
     }

-    if (!bitmap.Ok())
+
+    int width = bitmap.GetWidth(),
+        height = bitmap.GetHeight();
+
+    // scan the bitmap for the transparent colour and set the corresponding
+    // pixels in the mask to BLACK and the rest to WHITE
+    COLORREF maskColour = wxColourToPalRGB(colour);
+    m_maskBitmap = (WXHBITMAP)::CreateBitmap(width, height, 1, 1, 0);
+
+    HDC srcDC = ::CreateCompatibleDC(NULL);
+    HDC destDC = ::CreateCompatibleDC(NULL);
+    if ( !srcDC || !destDC )

     {
     {

-        return FALSE;
+        wxLogLastError(wxT("CreateCompatibleDC"));

     }
 
     }
 

-    // scan the bitmap for the transparent colour and set
-    // the corresponding pixels in the mask to BLACK and
-    // the rest to WHITE
-    COLORREF maskColour = RGB(colour.Red(), colour.Green(), colour.Blue());
-    m_maskBitmap = (WXHBITMAP) ::CreateBitmap(
-            bitmap.GetWidth(),
-            bitmap.GetHeight(),
-            1, 1, 0
-                                             );
-    HDC srcDC = ::CreateCompatibleDC(0);
-    ::SelectObject(srcDC, (HBITMAP) bitmap.GetHBITMAP());
-    HDC destDC = ::CreateCompatibleDC(0);
-    ::SelectObject(destDC, (HBITMAP) m_maskBitmap);
+    bool ok = true;
+
+    // SelectObject() will fail
+    wxASSERT_MSG( !bitmap.GetSelectedInto(),
+                  _T("bitmap can't be selected in another DC") );

 
 

-    // this is not very efficient, but I can't think
-    // of a better way of doing it
-    for (int w = 0; w < bitmap.GetWidth(); w++)
+    HGDIOBJ hbmpSrcOld = ::SelectObject(srcDC, GetHbitmapOf(bitmap));
+    if ( !hbmpSrcOld )

     {
     {

-        for (int h = 0; h < bitmap.GetHeight(); h++)
-        {
-            COLORREF col = GetPixel(srcDC, w, h);
-            if (col == maskColour)
-            {
-                ::SetPixel(destDC, w, h, RGB(0, 0, 0));
-            }
-            else
-            {
-                ::SetPixel(destDC, w, h, RGB(255, 255, 255));
-            }
-        }
+        wxLogLastError(wxT("SelectObject"));
+
+        ok = false;
+    }
+
+    HGDIOBJ hbmpDstOld = ::SelectObject(destDC, (HBITMAP)m_maskBitmap);
+    if ( !hbmpDstOld )
+    {
+        wxLogLastError(wxT("SelectObject"));
+
+        ok = false;

     }
     }

-    ::SelectObject(srcDC, 0);
+
+    if ( ok )
+    {
+        // this will create a monochrome bitmap with 0 points for the pixels
+        // which have the same value as the background colour and 1 for the
+        // others
+        ::SetBkColor(srcDC, maskColour);
+        ::BitBlt(destDC, 0, 0, width, height, srcDC, 0, 0, NOTSRCCOPY);
+    }
+
+    ::SelectObject(srcDC, hbmpSrcOld);

     ::DeleteDC(srcDC);
     ::DeleteDC(srcDC);

-    ::SelectObject(destDC, 0);
+    ::SelectObject(destDC, hbmpDstOld);

     ::DeleteDC(destDC);
     ::DeleteDC(destDC);

-    return TRUE;
+
+    return ok;
+#else // __WXMICROWIN__
+    wxUnusedVar(bitmap);
+    wxUnusedVar(colour);
+    return false;
+#endif // __WXMICROWIN__/!__WXMICROWIN__

 }
 
 // ----------------------------------------------------------------------------
 }
 
 // ----------------------------------------------------------------------------


@@ -696,7 +1501,7 @@ bool wxBitmapHandler::Create(wxGDIImage *image,
 {
     wxBitmap *bitmap = wxDynamicCast(image, wxBitmap);
 
 {
     wxBitmap *bitmap = wxDynamicCast(image, wxBitmap);
 

-    return bitmap ? Create(bitmap, data, width, height, depth) : FALSE;
+    return bitmap ? Create(bitmap, data, flags, width, height, depth) : false;

 }
 
 bool wxBitmapHandler::Load(wxGDIImage *image,
 }
 
 bool wxBitmapHandler::Load(wxGDIImage *image,


@@ -706,7 +1511,7 @@ bool wxBitmapHandler::Load(wxGDIImage *image,
 {
     wxBitmap *bitmap = wxDynamicCast(image, wxBitmap);
 
 {
     wxBitmap *bitmap = wxDynamicCast(image, wxBitmap);
 

-    return bitmap ? LoadFile(bitmap, name, flags, width, height) : FALSE;
+    return bitmap ? LoadFile(bitmap, name, flags, width, height) : false;

 }
 
 bool wxBitmapHandler::Save(wxGDIImage *image,
 }
 
 bool wxBitmapHandler::Save(wxGDIImage *image,


@@ -715,7 +1520,7 @@ bool wxBitmapHandler::Save(wxGDIImage *image,
 {
     wxBitmap *bitmap = wxDynamicCast(image, wxBitmap);
 
 {
     wxBitmap *bitmap = wxDynamicCast(image, wxBitmap);
 

-    return bitmap ? SaveFile(bitmap, name, type) : FALSE;
+    return bitmap ? SaveFile(bitmap, name, type) : false;

 }
 
 bool wxBitmapHandler::Create(wxBitmap *WXUNUSED(bitmap),
 }
 
 bool wxBitmapHandler::Create(wxBitmap *WXUNUSED(bitmap),


@@ -725,7 +1530,7 @@ bool wxBitmapHandler::Create(wxBitmap *WXUNUSED(bitmap),
                              int WXUNUSED(height),
                              int WXUNUSED(depth))
 {
                              int WXUNUSED(height),
                              int WXUNUSED(depth))
 {

-    return FALSE;
+    return false;

 }
 
 bool wxBitmapHandler::LoadFile(wxBitmap *WXUNUSED(bitmap),
 }
 
 bool wxBitmapHandler::LoadFile(wxBitmap *WXUNUSED(bitmap),


@@ -734,7 +1539,7 @@ bool wxBitmapHandler::LoadFile(wxBitmap *WXUNUSED(bitmap),
                                int WXUNUSED(desiredWidth),
                                int WXUNUSED(desiredHeight))
 {
                                int WXUNUSED(desiredWidth),
                                int WXUNUSED(desiredHeight))
 {

-    return FALSE;
+    return false;

 }
 
 bool wxBitmapHandler::SaveFile(wxBitmap *WXUNUSED(bitmap),
 }
 
 bool wxBitmapHandler::SaveFile(wxBitmap *WXUNUSED(bitmap),


@@ -742,25 +1547,23 @@ bool wxBitmapHandler::SaveFile(wxBitmap *WXUNUSED(bitmap),
                                int WXUNUSED(type),
                                const wxPalette *WXUNUSED(palette))
 {
                                int WXUNUSED(type),
                                const wxPalette *WXUNUSED(palette))
 {

-    return FALSE;
+    return false;

 }
 
 // ----------------------------------------------------------------------------
 // DIB functions
 // ----------------------------------------------------------------------------
 
 }
 
 // ----------------------------------------------------------------------------
 // DIB functions
 // ----------------------------------------------------------------------------
 

+#ifndef __WXMICROWIN__

 bool wxCreateDIB(long xSize, long ySize, long bitsPerPixel,
                  HPALETTE hPal, LPBITMAPINFO* lpDIBHeader)
 {
    unsigned long   i, headerSize;
 bool wxCreateDIB(long xSize, long ySize, long bitsPerPixel,
                  HPALETTE hPal, LPBITMAPINFO* lpDIBHeader)
 {
    unsigned long   i, headerSize;

-   LPBITMAPINFO    lpDIBheader = NULL;
-   LPPALETTEENTRY  lpPe = NULL;
-

 
    // Allocate space for a DIB header
    headerSize = (sizeof(BITMAPINFOHEADER) + (256 * sizeof(PALETTEENTRY)));
 
    // Allocate space for a DIB header
    headerSize = (sizeof(BITMAPINFOHEADER) + (256 * sizeof(PALETTEENTRY)));

-   lpDIBheader = (BITMAPINFO *) malloc(headerSize);
-   lpPe = (PALETTEENTRY *)((BYTE*)lpDIBheader + sizeof(BITMAPINFOHEADER));
+   LPBITMAPINFO lpDIBheader = (BITMAPINFO *) malloc(headerSize);
+   LPPALETTEENTRY lpPe = (PALETTEENTRY *)((BYTE*)lpDIBheader + sizeof(BITMAPINFOHEADER));

 
    GetPaletteEntries(hPal, 0, 256, lpPe);
 
 
    GetPaletteEntries(hPal, 0, 256, lpPe);
 


@@ -775,7 +1578,7 @@ bool wxCreateDIB(long xSize, long ySize, long bitsPerPixel,
    // this value must be 1, 4, 8 or 24 so PixelDepth can only be
    lpDIBheader->bmiHeader.biBitCount = (WORD)(bitsPerPixel);
    lpDIBheader->bmiHeader.biCompression = BI_RGB;
    // this value must be 1, 4, 8 or 24 so PixelDepth can only be
    lpDIBheader->bmiHeader.biBitCount = (WORD)(bitsPerPixel);
    lpDIBheader->bmiHeader.biCompression = BI_RGB;

-   lpDIBheader->bmiHeader.biSizeImage = xSize * abs(ySize) * bitsPerPixel >> 3;
+   lpDIBheader->bmiHeader.biSizeImage = (xSize * abs(ySize) * bitsPerPixel) >> 3;

    lpDIBheader->bmiHeader.biClrUsed = 256;
 
 
    lpDIBheader->bmiHeader.biClrUsed = 256;
 
 


@@ -789,12 +1592,162 @@ bool wxCreateDIB(long xSize, long ySize, long bitsPerPixel,
 
    *lpDIBHeader = lpDIBheader;
 
 
    *lpDIBHeader = lpDIBheader;
 

-   return TRUE;
+   return true;

 }
 
 void wxFreeDIB(LPBITMAPINFO lpDIBHeader)
 {
     free(lpDIBHeader);
 }
 }
 
 void wxFreeDIB(LPBITMAPINFO lpDIBHeader)
 {
     free(lpDIBHeader);
 }

+#endif

 
 

+// ----------------------------------------------------------------------------
+// global helper functions implemented here
+// ----------------------------------------------------------------------------
+
+// helper of wxBitmapToHICON/HCURSOR
+static
+HICON wxBitmapToIconOrCursor(const wxBitmap& bmp,
+                             bool iconWanted,
+                             int hotSpotX,
+                             int hotSpotY)
+{
+    if ( !bmp.Ok() )
+    {
+        // we can't create an icon/cursor form nothing
+        return 0;
+    }
+
+    if ( bmp.HasAlpha() )
+    {
+        // Create an empty mask bitmap.
+        // it doesn't seem to work if we mess with the mask at all.
+        HBITMAP hMonoBitmap = CreateBitmap(bmp.GetWidth(),bmp.GetHeight(),1,1,NULL);
+
+        ICONINFO iconInfo;
+        wxZeroMemory(iconInfo);
+        iconInfo.fIcon = iconWanted;  // do we want an icon or a cursor?
+        if ( !iconWanted )
+        {
+            iconInfo.xHotspot = hotSpotX;
+            iconInfo.yHotspot = hotSpotY;
+        }
+
+        iconInfo.hbmMask = hMonoBitmap;
+        iconInfo.hbmColor = GetHbitmapOf(bmp);
+
+        HICON hicon = ::CreateIconIndirect(&iconInfo);
+
+        ::DeleteObject(hMonoBitmap);

 
 

+        return hicon;
+    }
+
+    wxMask* mask = bmp.GetMask();
+
+    if ( !mask )
+    {
+        // we must have a mask for an icon, so even if it's probably incorrect,
+        // do create it (grey is the "standard" transparent colour)
+        mask = new wxMask(bmp, *wxLIGHT_GREY);
+    }
+
+    ICONINFO iconInfo;
+    wxZeroMemory(iconInfo);
+    iconInfo.fIcon = iconWanted;  // do we want an icon or a cursor?
+    if ( !iconWanted )
+    {
+        iconInfo.xHotspot = hotSpotX;
+        iconInfo.yHotspot = hotSpotY;
+    }
+
+    iconInfo.hbmMask = wxInvertMask((HBITMAP)mask->GetMaskBitmap());
+    iconInfo.hbmColor = GetHbitmapOf(bmp);
+
+    // black out the transparent area to preserve background colour, because
+    // Windows blits the original bitmap using SRCINVERT (XOR) after applying
+    // the mask to the dest rect.
+    {
+        MemoryHDC dcSrc, dcDst;
+        SelectInHDC selectMask(dcSrc, (HBITMAP)mask->GetMaskBitmap()),
+                    selectBitmap(dcDst, iconInfo.hbmColor);
+
+        if ( !::BitBlt(dcDst, 0, 0, bmp.GetWidth(), bmp.GetHeight(),
+                       dcSrc, 0, 0, SRCAND) )
+        {
+            wxLogLastError(_T("BitBlt"));
+        }
+    }
+
+    HICON hicon = ::CreateIconIndirect(&iconInfo);
+
+    if ( !bmp.GetMask() && !bmp.HasAlpha() )
+    {
+        // we created the mask, now delete it
+        delete mask;
+    }
+
+    // delete the inverted mask bitmap we created as well
+    ::DeleteObject(iconInfo.hbmMask);
+
+    return hicon;
+}
+
+HICON wxBitmapToHICON(const wxBitmap& bmp)
+{
+    return wxBitmapToIconOrCursor(bmp, true, 0, 0);
+}
+
+HCURSOR wxBitmapToHCURSOR(const wxBitmap& bmp, int hotSpotX, int hotSpotY)
+{
+    return (HCURSOR)wxBitmapToIconOrCursor(bmp, false, hotSpotX, hotSpotY);
+}
+
+HBITMAP wxInvertMask(HBITMAP hbmpMask, int w, int h)
+{
+#ifndef __WXMICROWIN__
+    wxCHECK_MSG( hbmpMask, 0, _T("invalid bitmap in wxInvertMask") );
+
+    // get width/height from the bitmap if not given
+    if ( !w || !h )
+    {
+        BITMAP bm;
+        ::GetObject(hbmpMask, sizeof(BITMAP), (LPVOID)&bm);
+        w = bm.bmWidth;
+        h = bm.bmHeight;
+    }
+
+    HDC hdcSrc = ::CreateCompatibleDC(NULL);
+    HDC hdcDst = ::CreateCompatibleDC(NULL);
+    if ( !hdcSrc || !hdcDst )
+    {
+        wxLogLastError(wxT("CreateCompatibleDC"));
+    }
+
+    HBITMAP hbmpInvMask = ::CreateBitmap(w, h, 1, 1, 0);
+    if ( !hbmpInvMask )
+    {
+        wxLogLastError(wxT("CreateBitmap"));
+    }
+
+    HGDIOBJ srcTmp = ::SelectObject(hdcSrc, hbmpMask);
+    HGDIOBJ dstTmp = ::SelectObject(hdcDst, hbmpInvMask);
+    if ( !::BitBlt(hdcDst, 0, 0, w, h,
+                   hdcSrc, 0, 0,
+                   NOTSRCCOPY) )
+    {
+        wxLogLastError(wxT("BitBlt"));
+    }
+
+    // Deselect objects
+    SelectObject(hdcSrc,srcTmp);
+    SelectObject(hdcDst,dstTmp);
+
+    ::DeleteDC(hdcSrc);
+    ::DeleteDC(hdcDst);
+
+    return hbmpInvMask;
+#else
+    return 0;
+#endif
+}