]> git.saurik.com Git - wxWidgets.git/blobdiff - src/os2/bitmap.cpp
Don't create a bitmap with dimensions <= 0...
[wxWidgets.git] / src / os2 / bitmap.cpp
index 5ffef72a4bf0fa759aee962173723f42d98a379a..eb52b51de1fdc61911bc55e8d99cc3d81f239e4b 100644 (file)
@@ -57,7 +57,8 @@ wxBitmapRefData::wxBitmapRefData()
     m_pSelectedInto = NULL;
     m_nNumColors    = 0;
     m_pBitmapMask   = NULL;
-}
+    m_hBitmap = (WXHBITMAP) NULL;
+} // end of wxBitmapRefData::wxBitmapRefData
 
 void wxBitmapRefData::Free()
 {
@@ -74,7 +75,7 @@ void wxBitmapRefData::Free()
 
     delete m_pBitmapMask;
     m_pBitmapMask = NULL;
-}
+} // end of wxBitmapRefData::Free
 
 // ----------------------------------------------------------------------------
 // wxBitmap creation
@@ -87,29 +88,38 @@ void wxBitmap::Init()
 
     if (wxTheBitmapList)
         wxTheBitmapList->AddBitmap(this);
-}
+} // end of wxBitmap::Init
 
 bool wxBitmap::CopyFromIconOrCursor(
   const wxGDIImage&                 rIcon
 )
 {
+    HPOINTER                        hIcon = (HPOINTER)rIcon.GetHandle();
+    POINTERINFO                     SIconInfo;
+
+    if (!::WinQueryPointerInfo(hIcon, &SIconInfo))
+    {
+        wxLogLastError(wxT("WinQueryPointerInfo"));
+        return FALSE;
+    }
     wxBitmapRefData*                pRefData = new wxBitmapRefData;
 
     m_refData = pRefData;
 
-    pRefData->m_nWidth = rIcon.GetWidth();
-    pRefData->m_nHeight = rIcon.GetHeight();
-    pRefData->m_nDepth = wxDisplayDepth();
+    int                             nWidth = rIcon.GetWidth();
+    int                             nHeight = rIcon.GetHeight();
 
-    pRefData->m_hBitmap = (WXHBITMAP)rIcon.GetHandle();
-    // no mask???
-    pRefData->m_pBitmapMask = new wxMask();
+    pRefData->m_nWidth  = nWidth;
+    pRefData->m_nHeight = nHeight;
+    pRefData->m_nDepth  = wxDisplayDepth();
 
-#if WXWIN_COMPATIBILITY_2
-    pRefData->m_bOk = TRUE;
-#endif // WXWIN_COMPATIBILITY_2
+    pRefData->m_hBitmap = (WXHBITMAP)SIconInfo.hbmColor;
+
+    //
+    // No mask in the Info struct in OS/2
+    //
     return(TRUE);
-}
+} // end of wxBitmap::CopyFromIconOrCursor
 
 bool wxBitmap::CopyFromCursor(
   const wxCursor&                   rCursor
@@ -120,7 +130,7 @@ bool wxBitmap::CopyFromCursor(
     if (!rCursor.Ok())
         return(FALSE);
     return(CopyFromIconOrCursor(rCursor));
-}
+} // end of wxBitmap::CopyFromCursor
 
 bool wxBitmap::CopyFromIcon(
   const wxIcon&                     rIcon
@@ -131,18 +141,14 @@ bool wxBitmap::CopyFromIcon(
     if (!rIcon.Ok())
         return(FALSE);
 
-#if WXWIN_COMPATIBILITY_2
-    refData->m_ok = TRUE;
-#endif // WXWIN_COMPATIBILITY_2
-
     return CopyFromIconOrCursor(rIcon);
-}
+} // end of wxBitmap::CopyFromIcon
 
 wxBitmap::~wxBitmap()
 {
     if (wxTheBitmapList)
         wxTheBitmapList->DeleteObject(this);
-}
+} // end of wxBitmap::~wxBitmap
 
 wxBitmap::wxBitmap(
   const char                        zBits[]
@@ -203,12 +209,14 @@ wxBitmap::wxBitmap(
         wxLogLastError("CreateBitmap");
     }
     SetHBITMAP((WXHBITMAP)hBmp);
-}
+} // end of wxBitmap::wxBitmap
 
+//
 // Create from XPM data
+//
 wxBitmap::wxBitmap(
   char**                            ppData
-, wxControl*                        WXUNUSED(pAnItem))
+)
 {
     Init();
 
@@ -218,7 +226,21 @@ wxBitmap::wxBitmap(
                  ,0
                  ,0
                 );
-}
+} // end of wxBitmap::wxBitmap
+
+wxBitmap::wxBitmap(
+  const char**                      ppData
+)
+{
+    Init();
+
+    (void)Create( (void *)ppData
+                 ,wxBITMAP_TYPE_XPM_DATA
+                 ,0
+                 ,0
+                 ,0
+                );
+} // end of wxBitmap::wxBitmap
 
 wxBitmap::wxBitmap(
   int                               nW
@@ -232,7 +254,7 @@ wxBitmap::wxBitmap(
                  ,nH
                  ,nD
                 );
-}
+} // end of wxBitmap::wxBitmap
 
 wxBitmap::wxBitmap(
   void*                             pData
@@ -250,7 +272,7 @@ wxBitmap::wxBitmap(
                  ,nHeight
                  ,nDepth
                 );
-}
+} // end of wxBitmap::wxBitmap
 
 wxBitmap::wxBitmap(
   const wxString&                   rFilename
@@ -262,7 +284,7 @@ wxBitmap::wxBitmap(
     LoadFile( rFilename
              ,(int)lType
             );
-}
+} // end of wxBitmap::wxBitmap
 
 bool wxBitmap::Create(
   int                               nW
@@ -272,63 +294,63 @@ bool wxBitmap::Create(
 {
     HBITMAP                         hBmp;
     BITMAPINFOHEADER2               vHeader;
-    BITMAPINFO2                     vInfo;
-    HPS                             hpsScreen;
-    HDC                             hdcScreen;
-    DEVOPENSTRUC                    vDop = { NULL, "DISPLAY", NULL, NULL, NULL, NULL, NULL, NULL, NULL };
-    SIZEL                           vSize = {0, 0};
-    LONG                            lBitCount;
 
     wxASSERT(vHabmain != NULL);
-
-    hpsScreen = ::WinGetScreenPS(HWND_DESKTOP);
-    hdcScreen = ::GpiQueryDevice(hpsScreen);
-    ::DevQueryCaps(hdcScreen, CAPS_COLOR_BITCOUNT, 1L, &lBitCount);
-
-    vHeader.cbFix           = sizeof(vHeader);
-    vHeader.cx              = (USHORT)nW;
-    vHeader.cy              = (USHORT)nH;
-    vHeader.cPlanes         = (USHORT)nD;
-    vHeader.cBitCount       = lBitCount;
-    vHeader.ulCompression   = BCA_UNCOMP;
-    vHeader.cxResolution    = 0;
-    vHeader.cyResolution    = 0;
-    vHeader.cclrUsed        = 0;
-    vHeader.cclrImportant   = 0;
-    vHeader.usUnits         = BRU_METRIC;
-    vHeader.usRecording     = BRA_BOTTOMUP;
-    vHeader.usRendering     = BRH_NOTHALFTONED;
-    vHeader.cSize1          = 0;
-    vHeader.cSize2          = 0;
-    vHeader.ulColorEncoding = 0;
-    vHeader.ulIdentifier    = 0;
-
     UnRef();
     m_refData = new wxBitmapRefData;
-
     GetBitmapData()->m_nWidth = nW;
     GetBitmapData()->m_nHeight = nH;
     GetBitmapData()->m_nDepth = nD;
 
     if (nD > 0)
     {
-        hBmp = ::GpiCreateBitmap(hpsScreen, &vHeader, 0L, NULL, &vInfo);
-        if (!hBmp)
-        {
-            wxLogLastError("CreateBitmap");
-        }
+        DEVOPENSTRUC                vDop  = {0L, "DISPLAY", NULL, 0L, 0L, 0L, 0L, 0L, 0L};
+        SIZEL                       vSize = {0, 0};
+        HDC                         hDC   = ::DevOpenDC(vHabmain, OD_MEMORY, "*", 5L, (PDEVOPENDATA)&vDop, NULLHANDLE);
+        HPS                         hPS   = ::GpiCreatePS(vHabmain, hDC, &vSize, PU_PELS | GPIA_ASSOC);
+
+        memset(&vHeader, '\0', sizeof(BITMAPINFOHEADER2));
+        vHeader.cbFix     =  sizeof(BITMAPINFOHEADER2);
+        vHeader.cx        = nW;
+        vHeader.cy        = nH;
+        vHeader.cPlanes   = 1;
+        vHeader.cBitCount = nD;
+
+        hBmp = ::GpiCreateBitmap( hPS
+                                 ,&vHeader
+                                 ,0L
+                                 ,NULL
+                                 ,NULL
+                                );
+        ::GpiDestroyPS(hPS);
+        ::DevCloseDC(hDC);
     }
     else
     {
-        LONG                            lPlanes;
+        HPS                             hPSScreen;
+        HDC                             hDCScreen;
+        LONG                            lBitCount;
+
+        hPSScreen = ::WinGetScreenPS(HWND_DESKTOP);
+        hDCScreen = ::GpiQueryDevice(hPSScreen);
+        ::DevQueryCaps(hDCScreen, CAPS_COLOR_BITCOUNT, 1L, &lBitCount);
+
+        memset(&vHeader, '\0', sizeof(BITMAPINFOHEADER2));
+        vHeader.cbFix     =  sizeof(BITMAPINFOHEADER2);
+        vHeader.cx        = nW;
+        vHeader.cy        = nH;
+        vHeader.cPlanes   = 1;
+        vHeader.cBitCount = lBitCount;
+
+        hBmp = ::GpiCreateBitmap( hPSScreen
+                                 ,&vHeader
+                                 ,0L
+                                 ,NULL
+                                 ,NULL
+                                );
 
-        ::DevQueryCaps(hdcScreen, CAPS_COLOR_PLANES, 1L, &lPlanes);
-        hBmp = ::GpiCreateBitmap(hpsScreen, &vHeader, 0L, NULL, &vInfo);
-        if (!hBmp)
-        {
-            wxLogLastError("CreateBitmap");
-        }
         GetBitmapData()->m_nDepth = wxDisplayDepth();
+        ::WinReleasePS(hPSScreen);
     }
     SetHBITMAP((WXHBITMAP)hBmp);
 
@@ -337,7 +359,7 @@ bool wxBitmap::Create(
 #endif // WXWIN_COMPATIBILITY_2
 
     return Ok();
-}
+} // end of wxBitmap::Create
 
 bool wxBitmap::LoadFile(
   const wxString&                   rFilename
@@ -375,7 +397,7 @@ bool wxBitmap::LoadFile(
 
         return(TRUE);
     }
-}
+} // end of wxBitmap::LoadFile
 
 bool wxBitmap::Create(
   void*                             pData
@@ -408,7 +430,7 @@ bool wxBitmap::Create(
                             ,nHeight
                             ,nDepth
                            ));
-}
+} // end of wxBitmap::Create
 
 bool wxBitmap::SaveFile(
   const wxString&                   rFilename
@@ -440,8 +462,435 @@ bool wxBitmap::SaveFile(
                                ,lType
                               ));
     }
+} // end of wxBitmap::SaveFile
+
+
+// ----------------------------------------------------------------------------
+// wxImage-wxBitmap convertion
+// ----------------------------------------------------------------------------
+
+bool wxBitmap::CreateFromImage( const wxImage& image, int depth )
+{
+    wxCHECK_MSG( image.Ok(), FALSE, wxT("invalid image") )
+
+// TODO:
+/*
+    int sizeLimit = 1024*768*3;
+
+    // width and height of the device-dependent bitmap
+    int width = GetWidth();
+    int bmpHeight = GetHeight();
+
+    // calc the number of bytes per scanline and padding
+    int bytePerLine = width*3;
+    int sizeDWORD = sizeof( DWORD );
+    int lineBoundary = bytePerLine % sizeDWORD;
+    int padding = 0;
+    if( lineBoundary > 0 )
+    {
+        padding = sizeDWORD - lineBoundary;
+        bytePerLine += padding;
+    }
+    // calc the number of DIBs and heights of DIBs
+    int numDIB = 1;
+    int hRemain = 0;
+    int height = sizeLimit/bytePerLine;
+    if( height >= bmpHeight )
+        height = bmpHeight;
+    else
+    {
+        numDIB =  bmpHeight / height;
+        hRemain = bmpHeight % height;
+        if( hRemain >0 )  numDIB++;
+    }
+
+    // set bitmap parameters
+    wxBitmap bitmap;
+    wxCHECK_MSG( Ok(), bitmap, wxT("invalid image") );
+    bitmap.SetWidth( width );
+    bitmap.SetHeight( bmpHeight );
+    bitmap.SetDepth( wxDisplayDepth() );
+
+    // create a DIB header
+    int headersize = sizeof(BITMAPINFOHEADER);
+    LPBITMAPINFO lpDIBh = (BITMAPINFO *) malloc( headersize );
+    wxCHECK_MSG( lpDIBh, bitmap, wxT("could not allocate memory for DIB header") );
+    // Fill in the DIB header
+    lpDIBh->bmiHeader.biSize = headersize;
+    lpDIBh->bmiHeader.biWidth = (DWORD)width;
+    lpDIBh->bmiHeader.biHeight = (DWORD)(-height);
+    lpDIBh->bmiHeader.biSizeImage = bytePerLine*height;
+    //   the general formula for biSizeImage:
+    //      ( ( ( ((DWORD)width*24) +31 ) & ~31 ) >> 3 ) * height;
+    lpDIBh->bmiHeader.biPlanes = 1;
+    lpDIBh->bmiHeader.biBitCount = 24;
+    lpDIBh->bmiHeader.biCompression = BI_RGB;
+    lpDIBh->bmiHeader.biClrUsed = 0;
+    // These seem not really needed for our purpose here.
+    lpDIBh->bmiHeader.biClrImportant = 0;
+    lpDIBh->bmiHeader.biXPelsPerMeter = 0;
+    lpDIBh->bmiHeader.biYPelsPerMeter = 0;
+    // memory for DIB data
+    unsigned char *lpBits;
+    lpBits = (unsigned char *)malloc( lpDIBh->bmiHeader.biSizeImage );
+    if( !lpBits )
+    {
+        wxFAIL_MSG( wxT("could not allocate memory for DIB") );
+        free( lpDIBh );
+        return bitmap;
+    }
+
+    // create and set the device-dependent bitmap
+    HDC hdc = ::GetDC(NULL);
+    HDC memdc = ::CreateCompatibleDC( hdc );
+    HBITMAP hbitmap;
+    hbitmap = ::CreateCompatibleBitmap( hdc, width, bmpHeight );
+    ::SelectObject( memdc, hbitmap);
+
+    // copy image data into DIB data and then into DDB (in a loop)
+    unsigned char *data = GetData();
+    int i, j, n;
+    int origin = 0;
+    unsigned char *ptdata = data;
+    unsigned char *ptbits;
+
+    for( n=0; n<numDIB; n++ )
+    {
+        if( numDIB > 1 && n == numDIB-1 && hRemain > 0 )
+        {
+            // redefine height and size of the (possibly) last smaller DIB
+            // memory is not reallocated
+            height = hRemain;
+            lpDIBh->bmiHeader.biHeight = (DWORD)(-height);
+            lpDIBh->bmiHeader.biSizeImage = bytePerLine*height;
+        }
+        ptbits = lpBits;
+
+        for( j=0; j<height; j++ )
+        {
+            for( i=0; i<width; i++ )
+            {
+                *(ptbits++) = *(ptdata+2);
+                *(ptbits++) = *(ptdata+1);
+                *(ptbits++) = *(ptdata  );
+                ptdata += 3;
+            }
+            for( i=0; i< padding; i++ )   *(ptbits++) = 0;
+        }
+        ::StretchDIBits( memdc, 0, origin, width, height,\
+            0, 0, width, height, lpBits, lpDIBh, DIB_RGB_COLORS, SRCCOPY);
+        origin += height;
+        // if numDIB = 1,  lines below can also be used
+        //    hbitmap = CreateDIBitmap( hdc, &(lpDIBh->bmiHeader), CBM_INIT, lpBits, lpDIBh, DIB_RGB_COLORS );
+        // The above line is equivalent to the following two lines.
+        //    hbitmap = ::CreateCompatibleBitmap( hdc, width, height );
+        //    ::SetDIBits( hdc, hbitmap, 0, height, lpBits, lpDIBh, DIB_RGB_COLORS);
+        // or the following lines
+        //    hbitmap = ::CreateCompatibleBitmap( hdc, width, height );
+        //    HDC memdc = ::CreateCompatibleDC( hdc );
+        //    ::SelectObject( memdc, hbitmap);
+        //    ::SetDIBitsToDevice( memdc, 0, 0, width, height,
+        //            0, 0, 0, height, (void *)lpBits, lpDIBh, DIB_RGB_COLORS);
+        //    ::SelectObject( memdc, 0 );
+        //    ::DeleteDC( memdc );
+    }
+    bitmap.SetHBITMAP( (WXHBITMAP) hbitmap );
+
+    // similarly, created an mono-bitmap for the possible mask
+    if( HasMask() )
+    {
+        hbitmap = ::CreateBitmap( (WORD)width, (WORD)bmpHeight, 1, 1, NULL );
+        ::SelectObject( memdc, hbitmap);
+        if( numDIB == 1 )   height = bmpHeight;
+        else                height = sizeLimit/bytePerLine;
+        lpDIBh->bmiHeader.biHeight = (DWORD)(-height);
+        lpDIBh->bmiHeader.biSizeImage = bytePerLine*height;
+        origin = 0;
+        unsigned char r = GetMaskRed();
+        unsigned char g = GetMaskGreen();
+        unsigned char b = GetMaskBlue();
+        unsigned char zero = 0, one = 255;
+        ptdata = data;
+        for( n=0; n<numDIB; n++ )
+        {
+            if( numDIB > 1 && n == numDIB - 1 && hRemain > 0 )
+            {
+                // redefine height and size of the (possibly) last smaller DIB
+                // memory is not reallocated
+                height = hRemain;
+                lpDIBh->bmiHeader.biHeight = (DWORD)(-height);
+                lpDIBh->bmiHeader.biSizeImage = bytePerLine*height;
+            }
+            ptbits = lpBits;
+            for( int j=0; j<height; j++ )
+            {
+                for(i=0; i<width; i++ )
+                {
+                    if( (*(ptdata++)!=r) | (*(ptdata++)!=g) | (*(ptdata++)!=b) )
+                    {
+                        *(ptbits++) = one;
+                        *(ptbits++) = one;
+                        *(ptbits++) = one;
+                    }
+                    else
+                    {
+                        *(ptbits++) = zero;
+                        *(ptbits++) = zero;
+                        *(ptbits++) = zero;
+                    }
+                }
+                for( i=0; i< padding; i++ )   *(ptbits++) = zero;
+            }
+            ::StretchDIBits( memdc, 0, origin, width, height,\
+                0, 0, width, height, lpBits, lpDIBh, DIB_RGB_COLORS, SRCCOPY);
+            origin += height;
+        }
+        // create a wxMask object
+        wxMask *mask = new wxMask();
+        mask->SetMaskBitmap( (WXHBITMAP) hbitmap );
+        bitmap.SetMask( mask );
+    }
+
+    // free allocated resources
+    ::SelectObject( memdc, 0 );
+    ::DeleteDC( memdc );
+    ::ReleaseDC(NULL, hdc);
+    free(lpDIBh);
+    free(lpBits);
+
+    // check the wxBitmap object
+    if( bitmap.GetHBITMAP() )
+        bitmap.SetOk( TRUE );
+    else
+        bitmap.SetOk( FALSE );
+*/
+
+    return TRUE;
 }
 
+wxImage wxBitmap::ConvertToImage() const
+{
+    wxImage image;
+    
+    wxCHECK_MSG( Ok(), wxNullImage, wxT("invalid bitmap") );
+
+    // create an wxImage object
+    int width = GetWidth();
+    int height = GetHeight();
+    image.Create( width, height );
+    unsigned char *data = image.GetData();
+    if( !data )
+    {
+        wxFAIL_MSG( wxT("could not allocate data for image") );
+        return wxNullImage;
+    }
+
+    // calc the number of bytes per scanline and padding in the DIB
+    int bytePerLine = width*3;
+    int sizeDWORD = sizeof( DWORD );
+    int lineBoundary =  bytePerLine % sizeDWORD;
+    int padding = 0;
+    if( lineBoundary > 0 )
+    {
+        padding = sizeDWORD - lineBoundary;
+        bytePerLine += padding;
+    }
+// TODO:
+/*
+    // create a DIB header
+    int headersize = sizeof(BITMAPINFOHEADER);
+    LPBITMAPINFO lpDIBh = (BITMAPINFO *) malloc( headersize );
+    if( !lpDIBh )
+    {
+        wxFAIL_MSG( wxT("could not allocate data for DIB header") );
+        free( data );
+        return;
+    }
+    // Fill in the DIB header
+    lpDIBh->bmiHeader.biSize = headersize;
+    lpDIBh->bmiHeader.biWidth = width;
+    lpDIBh->bmiHeader.biHeight = -height;
+    lpDIBh->bmiHeader.biSizeImage = bytePerLine * height;
+    lpDIBh->bmiHeader.biPlanes = 1;
+    lpDIBh->bmiHeader.biBitCount = 24;
+    lpDIBh->bmiHeader.biCompression = BI_RGB;
+    lpDIBh->bmiHeader.biClrUsed = 0;
+    // These seem not really needed for our purpose here.
+    lpDIBh->bmiHeader.biClrImportant = 0;
+    lpDIBh->bmiHeader.biXPelsPerMeter = 0;
+    lpDIBh->bmiHeader.biYPelsPerMeter = 0;
+    // memory for DIB data
+    unsigned char *lpBits;
+    lpBits = (unsigned char *) malloc( lpDIBh->bmiHeader.biSizeImage );
+    if( !lpBits )
+    {
+        wxFAIL_MSG( wxT("could not allocate data for DIB") );
+        free( data );
+        free( lpDIBh );
+        return;
+    }
+
+    // copy data from the device-dependent bitmap to the DIB
+    HDC hdc = ::GetDC(NULL);
+    HBITMAP hbitmap;
+    hbitmap = (HBITMAP) bitmap.GetHBITMAP();
+    ::GetDIBits( hdc, hbitmap, 0, height, lpBits, lpDIBh, DIB_RGB_COLORS );
+
+    // copy DIB data into the wxImage object
+    int i, j;
+    unsigned char *ptdata = data;
+    unsigned char *ptbits = lpBits;
+    for( i=0; i<height; i++ )
+    {
+        for( j=0; j<width; j++ )
+        {
+            *(ptdata++) = *(ptbits+2);
+            *(ptdata++) = *(ptbits+1);
+            *(ptdata++) = *(ptbits  );
+            ptbits += 3;
+        }
+        ptbits += padding;
+    }
+
+    // similarly, set data according to the possible mask bitmap
+    if( bitmap.GetMask() && bitmap.GetMask()->GetMaskBitmap() )
+    {
+        hbitmap = (HBITMAP) bitmap.GetMask()->GetMaskBitmap();
+        // memory DC created, color set, data copied, and memory DC deleted
+        HDC memdc = ::CreateCompatibleDC( hdc );
+        ::SetTextColor( memdc, RGB( 0, 0, 0 ) );
+        ::SetBkColor( memdc, RGB( 255, 255, 255 ) );
+        ::GetDIBits( memdc, hbitmap, 0, height, lpBits, lpDIBh, DIB_RGB_COLORS );
+        ::DeleteDC( memdc );
+        // background color set to RGB(16,16,16) in consistent with wxGTK
+        unsigned char r=16, g=16, b=16;
+        ptdata = data;
+        ptbits = lpBits;
+        for( i=0; i<height; i++ )
+        {
+            for( j=0; j<width; j++ )
+            {
+                if( *ptbits != 0 )
+                    ptdata += 3;
+                else
+                {
+                    *(ptdata++)  = r;
+                    *(ptdata++)  = g;
+                    *(ptdata++)  = b;
+                }
+                ptbits += 3;
+            }
+            ptbits += padding;
+        }
+        SetMaskColour( r, g, b );
+        SetMask( TRUE );
+    }
+    else
+    {
+        SetMask( FALSE );
+    }
+    // free allocated resources
+    ::ReleaseDC(NULL, hdc);
+    free(lpDIBh);
+    free(lpBits);
+*/
+
+    return image;
+}
+
+
+// ----------------------------------------------------------------------------
+// sub bitmap extraction
+// ----------------------------------------------------------------------------
+
+wxBitmap wxBitmap::GetSubBitmap(
+  const wxRect&                     rRect
+) const
+{
+    wxCHECK_MSG( Ok() &&
+                 (rRect.x >= 0) && (rRect.y >= 0) &&
+                 (rRect.x + rRect.width <= GetWidth()) &&
+                 (rRect.y + rRect.height <= GetHeight()),
+                 wxNullBitmap, wxT("Invalid bitmap or bitmap region") );
+
+    wxBitmap                        vRet( rRect.width
+                                         ,rRect.height
+                                         ,GetDepth()
+                                        );
+    wxASSERT_MSG( vRet.Ok(), wxT("GetSubBitmap error") );
+
+
+    //
+    // Copy bitmap data
+    //
+    SIZEL                           vSize = {0, 0};
+    DEVOPENSTRUC                    vDop = {0L, "DISPLAY", NULL, 0L, 0L, 0L, 0L, 0L, 0L};
+    HDC                             hDCSrc = ::DevOpenDC(vHabmain, OD_MEMORY, "*", 5L, (PDEVOPENDATA)&vDop, NULLHANDLE);
+    HDC                             hDCDst = ::DevOpenDC(vHabmain, OD_MEMORY, "*", 5L, (PDEVOPENDATA)&vDop, NULLHANDLE);
+    HPS                             hPSSrc = ::GpiCreatePS(vHabmain, hDCSrc, &vSize, PU_PELS | GPIA_ASSOC);
+    HPS                             hPSDst = ::GpiCreatePS(vHabmain, hDCDst, &vSize, PU_PELS | GPIA_ASSOC);
+    POINTL                          vPoint[4] = { rRect.x, rRect.y,
+                                                  rRect.x + rRect.width, rRect.y + rRect.height,
+                                                  0, 0, GetWidth(), GetHeight()
+                                                };
+
+    ::GpiSetBitmap(hPSSrc, (HBITMAP) GetHBITMAP());
+    ::GpiSetBitmap(hPSDst, (HBITMAP) vRet.GetHBITMAP());
+    ::GpiBitBlt( hPSDst
+                ,hPSSrc
+                ,4L
+                ,vPoint
+                ,ROP_SRCCOPY
+                ,BBO_IGNORE
+               );
+
+    //
+    // Copy mask if there is one
+    //
+    if (GetMask())
+    {
+        BITMAPINFOHEADER2           vBmih;
+
+        memset(&vBmih, '\0', sizeof(BITMAPINFOHEADER2));
+        vBmih.cbFix     = sizeof(BITMAPINFOHEADER2);
+        vBmih.cx        = rRect.width;
+        vBmih.cy        = rRect.height;
+        vBmih.cPlanes   = 1;
+        vBmih.cBitCount = 1;
+
+        HBITMAP                     hBmpMask = ::GpiCreateBitmap( hPSDst
+                                                                 ,&vBmih
+                                                                 ,0L
+                                                                 ,NULL
+                                                                 ,NULL
+                                                                );
+
+        ::GpiSetBitmap(hPSSrc, (HBITMAP) GetHBITMAP());
+        ::GpiSetBitmap(hPSDst, (HBITMAP) vRet.GetHBITMAP());
+
+        ::GpiSetBitmap(hPSSrc, (HBITMAP) GetMask()->GetMaskBitmap());
+        ::GpiSetBitmap(hPSDst, (HBITMAP) hBmpMask);
+        ::GpiBitBlt( hPSDst
+                    ,hPSSrc
+                    ,4L
+                    ,vPoint
+                    ,ROP_SRCCOPY
+                    ,BBO_IGNORE
+                   );
+
+        wxMask*                     pMask = new wxMask((WXHBITMAP)hBmpMask);
+        vRet.SetMask(pMask);
+    }
+
+    ::GpiSetBitmap(hPSSrc, NULL);
+    ::GpiSetBitmap(hPSDst, NULL);
+    ::GpiDestroyPS(hPSSrc);
+    ::GpiDestroyPS(hPSDst);
+    ::DevCloseDC(hDCSrc);
+    ::DevCloseDC(hDCDst);
+    return vRet;
+} // end of wxBitmap::GetSubBitmap
+
 // ----------------------------------------------------------------------------
 // wxBitmap accessors
 // ----------------------------------------------------------------------------
@@ -453,7 +902,7 @@ void wxBitmap::SetQuality(
     EnsureHasData();
 
     GetBitmapData()->m_nQuality = nQ;
-}
+} // end of wxBitmap::SetQuality
 
 #if WXWIN_COMPATIBILITY_2
 void wxBitmap::SetOk(
@@ -463,7 +912,7 @@ void wxBitmap::SetOk(
     EnsureHasData();
 
     GetBitmapData()->m_bOk = bOk;
-}
+} // end of wxBitmap::SetOk
 #endif // WXWIN_COMPATIBILITY_2
 
 void wxBitmap::SetPalette(
@@ -473,7 +922,7 @@ void wxBitmap::SetPalette(
     EnsureHasData();
 
     GetBitmapData()->m_vBitmapPalette = rPalette;
-}
+} // end of wxBitmap::SetPalette
 
 void wxBitmap::SetMask(
   wxMask*                           pMask
@@ -482,10 +931,12 @@ void wxBitmap::SetMask(
     EnsureHasData();
 
     GetBitmapData()->m_pBitmapMask = pMask;
-}
+} // end of wxBitmap::SetMask
 
+//
 // Will try something for OS/2 but not really sure how close
 // to the msw intent this is.
+//
 wxBitmap wxBitmap::GetBitmapForDC(
   wxDC&                             rDc
 ) const
@@ -510,7 +961,7 @@ wxBitmap wxBitmap::GetBitmapForDC(
     ::GpiBitBlt(hPs, hMemoryPS, 4L, vPoint, ROP_SRCCOPY, BBO_IGNORE);
 
     return(vTmpBitmap);
-}
+} // end of wxBitmap::GetBitmapForDC
 
 // ----------------------------------------------------------------------------
 // wxMask
@@ -519,7 +970,7 @@ wxBitmap wxBitmap::GetBitmapForDC(
 wxMask::wxMask()
 {
     m_hMaskBitmap = 0;
-}
+} // end of wxMask::wxMask
 
 // Construct a mask from a bitmap and a colour indicating
 // the transparent area
@@ -532,7 +983,7 @@ wxMask::wxMask(
     Create( rBitmap
            ,rColour
           );
-}
+} // end of wxMask::wxMask
 
 // Construct a mask from a bitmap and a palette index indicating
 // the transparent area
@@ -545,7 +996,7 @@ wxMask::wxMask(
     Create( rBitmap
            ,nPaletteIndex
           );
-}
+} // end of wxMask::wxMask
 
 // Construct a mask from a mono bitmap (copies the bitmap).
 wxMask::wxMask(
@@ -554,23 +1005,29 @@ wxMask::wxMask(
 {
     m_hMaskBitmap = 0;
     Create(rBitmap);
-}
+} // end of wxMask::wxMask
 
 wxMask::~wxMask()
 {
     if (m_hMaskBitmap)
         ::GpiDeleteBitmap((HBITMAP)m_hMaskBitmap);
-}
+} // end of wxMask::~wxMask
 
 // Create a mask from a mono bitmap (copies the bitmap).
 bool wxMask::Create(
   const wxBitmap&                   rBitmap
 )
 {
-    BITMAPINFOHEADER2               vHeader;
-    DEVOPENSTRUC                    vDop = { NULL, "DISPLAY", NULL, NULL, NULL, NULL, NULL, NULL, NULL };
+    BITMAPINFOHEADER2               vBmih;
     SIZEL                           vSize = {0, 0};
-    POINTL                          vPoint[4];
+    DEVOPENSTRUC                    vDop = {0L, "DISPLAY", NULL, 0L, 0L, 0L, 0L, 0L, 0L};
+    HDC                             hDCSrc = ::DevOpenDC(vHabmain, OD_MEMORY, "*", 5L, (PDEVOPENDATA)&vDop, NULLHANDLE);
+    HDC                             hDCDst = ::DevOpenDC(vHabmain, OD_MEMORY, "*", 5L, (PDEVOPENDATA)&vDop, NULLHANDLE);
+    HPS                             hPSSrc = ::GpiCreatePS(vHabmain, hDCSrc, &vSize, PU_PELS | GPIA_ASSOC);
+    HPS                             hPSDst = ::GpiCreatePS(vHabmain, hDCDst, &vSize, PU_PELS | GPIA_ASSOC);
+    POINTL                          vPoint[4] = { 0 ,0, rBitmap.GetWidth(), rBitmap.GetHeight(),
+                                                  0, 0, rBitmap.GetWidth(), rBitmap.GetHeight()
+                                                };
 
     if (m_hMaskBitmap)
     {
@@ -581,30 +1038,37 @@ bool wxMask::Create(
     {
         return(FALSE);
     }
-    vHeader.cbFix           = sizeof(vHeader);
-    vHeader.cx              = (USHORT)rBitmap.GetWidth();
-    vHeader.cy              = (USHORT)rBitmap.GetHeight();
-    vHeader.cPlanes         = 1;
-    vHeader.cBitCount       = 1;
-
-    m_hMaskBitmap = (WXHBITMAP) ::GpiCreateBitmap( m_hPs
-                                                  ,&vHeader
-                                                  ,0L
-                                                  ,NULL
-                                                  ,NULL
-                                                 );
-
-    HPS srcPS = ::GpiCreatePS(vHabmain, m_hDc, &vSize, PU_PELS | GPIT_MICRO | GPIA_ASSOC);
-    ::GpiSetBitmap(srcPS, (HBITMAP)rBitmap.GetHBITMAP());
-    HPS destPS = ::GpiCreatePS(vHabmain, m_hDc, &vSize, PU_PELS | GPIT_MICRO | GPIA_ASSOC);
-    ::GpiSetBitmap(srcPS, (HBITMAP)m_hMaskBitmap);
-    // TODO: Set the point array
-    ::GpiBitBlt(destPS, srcPS, 4L, vPoint, ROP_SRCCOPY , BBO_IGNORE);
-
-    ::GpiDestroyPS(srcPS);
-    ::GpiDestroyPS(destPS);
+
+    memset(&vBmih, '\0', sizeof(BITMAPINFOHEADER2));
+    vBmih.cbFix     =  sizeof(BITMAPINFOHEADER2);
+    vBmih.cx        = rBitmap.GetWidth();
+    vBmih.cy        = rBitmap.GetHeight();
+    vBmih.cPlanes   = 1;
+    vBmih.cBitCount = 1;
+
+    m_hMaskBitmap = ::GpiCreateBitmap( hPSDst
+                                      ,&vBmih
+                                      ,0L
+                                      ,NULL
+                                      ,NULL
+                                     );
+
+    ::GpiSetBitmap(hPSSrc, (HBITMAP) rBitmap.GetHBITMAP());
+    ::GpiSetBitmap(hPSDst, (HBITMAP) m_hMaskBitmap);
+    ::GpiBitBlt( hPSDst
+                ,hPSSrc
+                ,4L
+                ,vPoint
+                ,ROP_SRCCOPY
+                ,BBO_IGNORE
+               );
+
+    ::GpiDestroyPS(hPSSrc);
+    ::GpiDestroyPS(hPSDst);
+    ::DevCloseDC(hDCSrc);
+    ::DevCloseDC(hDCDst);
     return(TRUE);
-}
+} // end of wxMask::Create
 
 // Create a mask from a bitmap and a palette index indicating
 // the transparent area
@@ -641,7 +1105,7 @@ bool wxMask::Create(
         }
     }
     return(FALSE);
-}
+} // end of wxMask::Create
 
 // Create a mask from a bitmap and a colour indicating
 // the transparent area
@@ -650,10 +1114,21 @@ bool wxMask::Create(
 , const wxColour&                   rColour
 )
 {
-    BITMAPINFOHEADER2               vHeader;
-    DEVOPENSTRUC                    vDop = { NULL, "DISPLAY", NULL, NULL, NULL, NULL, NULL, NULL, NULL };
+    bool                            bOk = TRUE;
+    COLORREF                        vMaskColour = OS2RGB( rColour.Red()
+                                                         ,rColour.Green()
+                                                         ,rColour.Blue()
+                                                        );
+    BITMAPINFOHEADER2               vBmih;
     SIZEL                           vSize = {0, 0};
-    POINTL                          vPoint[4];
+    DEVOPENSTRUC                    vDop = { NULL, "DISPLAY", NULL, NULL, NULL, NULL, NULL, NULL, NULL };
+    HDC                             hDCSrc = ::DevOpenDC(vHabmain, OD_MEMORY, "*", 5L, (PDEVOPENDATA)&vDop, NULLHANDLE);
+    HDC                             hDCDst = ::DevOpenDC(vHabmain, OD_MEMORY, "*", 5L, (PDEVOPENDATA)&vDop, NULLHANDLE);
+    HPS                             hPSSrc = ::GpiCreatePS(vHabmain, hDCSrc, &vSize, PU_PELS | GPIA_ASSOC);
+    HPS                             hPSDst = ::GpiCreatePS(vHabmain, hDCDst, &vSize, PU_PELS | GPIA_ASSOC);
+    POINTL                          vPoint[4] = { 0 ,0, rBitmap.GetWidth(), rBitmap.GetHeight(),
+                                                  0, 0, rBitmap.GetWidth(), rBitmap.GetHeight()
+                                                };
 
     if (m_hMaskBitmap)
     {
@@ -665,58 +1140,68 @@ bool wxMask::Create(
         return(FALSE);
     }
 
-    // scan the bitmap for the transparent colour and set
+    //
+    // Scan the bitmap for the transparent colour and set
     // the corresponding pixels in the mask to BLACK and
     // the rest to WHITE
-    COLORREF                        vMaskColour = OS2RGB(rColour.Red(), rColour.Green(), rColour.Blue());
-
-    vHeader.cbFix           = sizeof(vHeader);
-    vHeader.cx              = (USHORT)rBitmap.GetWidth();
-    vHeader.cy              = (USHORT)rBitmap.GetHeight();
-    vHeader.cPlanes         = 1;
-    vHeader.cBitCount       = 1;
-
-    m_hMaskBitmap = (WXHBITMAP) ::GpiCreateBitmap( m_hPs
-                                                  ,&vHeader
-                                                  ,0L
-                                                  ,NULL
-                                                  ,NULL
-                                                 );
-
-    HPS srcPS = ::GpiCreatePS(vHabmain, m_hDc, &vSize, PU_PELS | GPIT_MICRO | GPIA_ASSOC);
-    ::GpiSetBitmap(srcPS, (HBITMAP)rBitmap.GetHBITMAP());
-    HPS destPS = ::GpiCreatePS(vHabmain, m_hDc, &vSize, PU_PELS | GPIT_MICRO | GPIA_ASSOC);
-    ::GpiSetBitmap(srcPS, (HBITMAP)m_hMaskBitmap);
-
-    // this is not very efficient, but I can't think
+    //
+
+    memset(&vBmih, '\0', sizeof(BITMAPINFOHEADER2));
+    vBmih.cbFix     =  sizeof(BITMAPINFOHEADER2);
+    vBmih.cx        = rBitmap.GetWidth();
+    vBmih.cy        = rBitmap.GetHeight();
+    vBmih.cPlanes   = 1;
+    vBmih.cBitCount = 1;
+
+    m_hMaskBitmap = ::GpiCreateBitmap( hPSDst
+                                      ,&vBmih
+                                      ,0L
+                                      ,NULL
+                                      ,NULL
+                                     );
+
+    ::GpiSetBitmap(hPSSrc, (HBITMAP) rBitmap.GetHBITMAP());
+    ::GpiSetBitmap(hPSDst, (HBITMAP) m_hMaskBitmap);
+
+    //
+    // This is not very efficient, but I can't think
     // of a better way of doing it
+    //
     for (int w = 0; w < rBitmap.GetWidth(); w++)
     {
         for (int h = 0; h < rBitmap.GetHeight(); h++)
         {
-            POINTL                  vPoint;
-
-            vPoint.x = w;
-            vPoint.y = h;
-
-            COLORREF                col = ::GpiQueryPel(srcPS, &vPoint);
+            POINTL                  vPt = {w, h};
+            COLORREF                vCol = (COLORREF)::GpiQueryPel(hPSSrc, &vPt);
+            if (vCol == (COLORREF)CLR_NOINDEX)
+            {
+                //
+                // Doesn't make sense to continue
+                //
+                bOk = FALSE;
+                break;
+            }
 
-            if (col == vMaskColour)
+            if (vCol == vMaskColour)
             {
-                ::GpiSetColor(destPS, CLR_WHITE);
-                ::GpiSetPel(destPS, &vPoint);
+                ::GpiSetColor(hPSDst, OS2RGB(0, 0, 0));
+                ::GpiSetPel(hPSDst, &vPt);
             }
             else
             {
-                ::GpiSetColor(destPS, CLR_BLACK);
-                ::GpiSetPel(destPS, &vPoint);
+                ::GpiSetColor(hPSDst, OS2RGB(255, 255, 255));
+                ::GpiSetPel(hPSDst, &vPt);
             }
         }
     }
-    ::GpiDestroyPS(srcPS);
-    ::GpiDestroyPS(destPS);
+    ::GpiSetBitmap(hPSSrc, NULL);
+    ::GpiSetBitmap(hPSDst, NULL);
+    ::GpiDestroyPS(hPSSrc);
+    ::GpiDestroyPS(hPSDst);
+    ::DevCloseDC(hDCSrc);
+    ::DevCloseDC(hDCDst);
     return(TRUE);
-}
+} // end of wxMask::Create
 
 // ----------------------------------------------------------------------------
 // wxBitmapHandler
@@ -815,3 +1300,73 @@ bool wxBitmapHandler::SaveFile(
     return(FALSE);
 }
 
+// ----------------------------------------------------------------------------
+// Utility functions
+// ----------------------------------------------------------------------------
+HBITMAP wxInvertMask(
+  HBITMAP                           hBmpMask
+, int                               nWidth
+, int                               nHeight
+)
+{
+    HBITMAP                         hBmpInvMask = 0;
+
+    wxCHECK_MSG( hBmpMask, 0, _T("invalid bitmap in wxInvertMask") );
+
+    //
+    // Get width/height from the bitmap if not given
+    //
+    if (!nWidth || !nHeight)
+    {
+        BITMAPINFOHEADER2           vBmhdr;
+
+        ::GpiQueryBitmapInfoHeader( hBmpMask
+                                   ,&vBmhdr
+                                  );
+        nWidth  = (int)vBmhdr.cx;
+        nHeight = (int)vBmhdr.cy;
+    }
+
+    BITMAPINFOHEADER2               vBmih;
+    SIZEL                           vSize = {0, 0};
+    DEVOPENSTRUC                    vDop = {0L, "DISPLAY", NULL, 0L, 0L, 0L, 0L, 0L, 0L};
+    HDC                             hDCSrc = ::DevOpenDC(vHabmain, OD_MEMORY, "*", 5L, (PDEVOPENDATA)&vDop, NULLHANDLE);
+    HDC                             hDCDst = ::DevOpenDC(vHabmain, OD_MEMORY, "*", 5L, (PDEVOPENDATA)&vDop, NULLHANDLE);
+    HPS                             hPSSrc = ::GpiCreatePS(vHabmain, hDCSrc, &vSize, PU_PELS | GPIA_ASSOC);
+    HPS                             hPSDst = ::GpiCreatePS(vHabmain, hDCDst, &vSize, PU_PELS | GPIA_ASSOC);
+    POINTL                          vPoint[4] = { 0 ,0, nWidth, nHeight,
+                                                  0, 0, nWidth, nHeight
+                                                };
+
+    memset(&vBmih, '\0', sizeof(BITMAPINFOHEADER2));
+    vBmih.cbFix     =  sizeof(BITMAPINFOHEADER2);
+    vBmih.cx        = nWidth;
+    vBmih.cy        = nHeight;
+    vBmih.cPlanes   = 1;
+    vBmih.cBitCount = 1;
+
+    hBmpInvMask = ::GpiCreateBitmap( hPSDst
+                                    ,&vBmih
+                                    ,0L
+                                    ,NULL
+                                    ,NULL
+                                   );
+
+    ::GpiSetBitmap(hPSSrc, (HBITMAP) hBmpMask);
+    ::GpiSetBitmap(hPSDst, (HBITMAP) hBmpInvMask);
+
+    ::GpiBitBlt( hPSDst
+                ,hPSSrc
+                ,4L
+                ,vPoint
+                ,ROP_SRCINVERT
+                ,BBO_IGNORE
+               );
+
+    ::GpiDestroyPS(hPSSrc);
+    ::GpiDestroyPS(hPSDst);
+    ::DevCloseDC(hDCSrc);
+    ::DevCloseDC(hDCDst);
+
+    return hBmpInvMask;
+} // end of WxWinGdi_InvertMask