simplified and cleaned up wxGTK's focus handling

[wxWidgets.git] / src / common / imagtiff.cpp

diff --git a/src/common/imagtiff.cpp b/src/common/imagtiff.cpp
index 1ca0a0d0f788e5d95d650ab92c87a5f78c6c64ca..3a5e63fb5e93e11a228052b065599cff03c6bfd6 100644 (file)
--- a/src/common/imagtiff.cpp
+++ b/src/common/imagtiff.cpp
@@ -1,245 +1,598 @@
 /////////////////////////////////////////////////////////////////////////////
 /////////////////////////////////////////////////////////////////////////////

-// Name:        imagjpeg.cpp
-// Purpose:     wxImage JPEG handler
-// Author:      Vaclav Slavik
+// Name:        src/common/imagtiff.cpp
+// Purpose:     wxImage TIFF handler
+// Author:      Robert Roebling

 // RCS-ID:      $Id$
 // RCS-ID:      $Id$

-// Copyright:   (c) Vaclav Slavik
+// Copyright:   (c) Robert Roebling

 // Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 
 // Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 

-/*
-   We don't put pragma implement in this file because it is already present in
-   src/common/image.cpp
-*/
+// ============================================================================
+// declarations
+// ============================================================================
+
+// ----------------------------------------------------------------------------
+// headers
+// ----------------------------------------------------------------------------

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

-#pragma hdrstop
+    #pragma hdrstop

 #endif
 
 #endif
 

-#include "wx/defs.h"
+#if wxUSE_IMAGE && wxUSE_LIBTIFF
+
+#include "wx/imagtiff.h"

 
 

-#if wxUSE_LIBTIFF
+#ifndef WX_PRECOMP
+    #include "wx/log.h"
+    #include "wx/app.h"
+    #include "wx/intl.h"
+    #include "wx/bitmap.h"
+    #include "wx/module.h"
+#endif

 
 

-#include "wx/image.h"
-#include "wx/bitmap.h"
-#include "wx/debug.h"
-#include "wx/log.h"
-#include "wx/app.h"

 extern "C"
 {
 extern "C"
 {

+#ifdef __DMC__
+    #include "tif_config.h"
+#endif

     #include "tiff.h"
     #include "tiffio.h"
     #include "tiff.h"
     #include "tiffio.h"

-    #include "tiffiop.h"

 }
 #include "wx/filefn.h"
 #include "wx/wfstream.h"
 }
 #include "wx/filefn.h"
 #include "wx/wfstream.h"

-#include "wx/intl.h"
-#include "wx/module.h"
+
+#ifndef TIFFLINKAGEMODE
+    #if defined(__WATCOMC__) && defined(__WXMGL__)
+        #define TIFFLINKAGEMODE cdecl
+    #else
+        #define TIFFLINKAGEMODE LINKAGEMODE
+    #endif
+#endif
+
+// ============================================================================
+// implementation
+// ============================================================================
+
+// ----------------------------------------------------------------------------
+// TIFF library error/warning handlers
+// ----------------------------------------------------------------------------
+
+extern "C"
+{
+
+static void
+TIFFwxWarningHandler(const char* module,
+                     const char* WXUNUSED_IN_UNICODE(fmt),
+                     va_list WXUNUSED_IN_UNICODE(ap))
+{
+    if (module != NULL)
+        wxLogWarning(_("tiff module: %s"), wxString::FromAscii(module).c_str());
+
+    // FIXME: this is not terrible informative but better than crashing!
+#if wxUSE_UNICODE
+    wxLogWarning(_("TIFF library warning."));
+#else
+    wxVLogWarning(fmt, ap);
+#endif
+}
+
+static void
+TIFFwxErrorHandler(const char* module,
+                   const char* WXUNUSED_IN_UNICODE(fmt),
+                   va_list WXUNUSED_IN_UNICODE(ap))
+{
+    if (module != NULL)
+        wxLogError(_("tiff module: %s"), wxString::FromAscii(module).c_str());
+
+    // FIXME: as above
+#if wxUSE_UNICODE
+    wxLogError(_("TIFF library error."));
+#else
+    wxVLogError(fmt, ap);
+#endif
+}
+
+} // extern "C"

 
 //-----------------------------------------------------------------------------
 // wxTIFFHandler
 //-----------------------------------------------------------------------------
 
 
 //-----------------------------------------------------------------------------
 // wxTIFFHandler
 //-----------------------------------------------------------------------------
 

-#if !USE_SHARED_LIBRARIES

 IMPLEMENT_DYNAMIC_CLASS(wxTIFFHandler,wxImageHandler)
 IMPLEMENT_DYNAMIC_CLASS(wxTIFFHandler,wxImageHandler)

-#endif

 
 

-static tsize_t
-_tiffReadProc(thandle_t handle, tdata_t buf, tsize_t size)
+wxTIFFHandler::wxTIFFHandler()
+{
+    m_name = wxT("TIFF file");
+    m_extension = wxT("tif");
+    m_type = wxBITMAP_TYPE_TIF;
+    m_mime = wxT("image/tiff");
+    TIFFSetWarningHandler((TIFFErrorHandler) TIFFwxWarningHandler);
+    TIFFSetErrorHandler((TIFFErrorHandler) TIFFwxErrorHandler);
+}
+
+#if wxUSE_STREAMS
+
+// helper to translate our, possibly 64 bit, wxFileOffset to TIFF, always 32
+// bit, toff_t
+static toff_t wxFileOffsetToTIFF(wxFileOffset ofs)
+{
+    if ( ofs == wxInvalidOffset )
+        return (toff_t)-1;
+
+    toff_t tofs = wx_truncate_cast(toff_t, ofs);
+    wxCHECK_MSG( (wxFileOffset)tofs == ofs, (toff_t)-1,
+                    _T("TIFF library doesn't support large files") );
+
+    return tofs;
+}
+
+// another helper to convert standard seek mode to our
+static wxSeekMode wxSeekModeFromTIFF(int whence)
+{
+    switch ( whence )
+    {
+        case SEEK_SET:
+            return wxFromStart;
+
+        case SEEK_CUR:
+            return wxFromCurrent;
+
+        case SEEK_END:
+            return wxFromEnd;
+
+        default:
+            return wxFromCurrent;
+    }
+}
+
+extern "C"
+{
+
+tsize_t TIFFLINKAGEMODE
+wxTIFFNullProc(thandle_t WXUNUSED(handle),
+          tdata_t WXUNUSED(buf),
+          tsize_t WXUNUSED(size))
+{
+    return (tsize_t) -1;
+}
+
+tsize_t TIFFLINKAGEMODE
+wxTIFFReadProc(thandle_t handle, tdata_t buf, tsize_t size)

 {
     wxInputStream *stream = (wxInputStream*) handle;
     stream->Read( (void*) buf, (size_t) size );
 {
     wxInputStream *stream = (wxInputStream*) handle;
     stream->Read( (void*) buf, (size_t) size );

-    return stream->LastRead();
+    return wx_truncate_cast(tsize_t, stream->LastRead());

 }
 
 }
 

-static tsize_t
-_tiffWriteProc(thandle_t handle, tdata_t buf, tsize_t size)
+tsize_t TIFFLINKAGEMODE
+wxTIFFWriteProc(thandle_t handle, tdata_t buf, tsize_t size)

 {
     wxOutputStream *stream = (wxOutputStream*) handle;
     stream->Write( (void*) buf, (size_t) size );
 {
     wxOutputStream *stream = (wxOutputStream*) handle;
     stream->Write( (void*) buf, (size_t) size );

-    return stream->LastWrite();
+    return wx_truncate_cast(tsize_t, stream->LastWrite());

 }
 
 }
 

-static toff_t
-_tiffSeekProc(thandle_t handle, toff_t off, int whence)
+toff_t TIFFLINKAGEMODE
+wxTIFFSeekIProc(thandle_t handle, toff_t off, int whence)

 {
     wxInputStream *stream = (wxInputStream*) handle;
 {
     wxInputStream *stream = (wxInputStream*) handle;

-    wxSeekMode mode;
-    switch (whence)
-    {
-        case SEEK_SET: mode = wxFromStart; break;
-        case SEEK_CUR: mode = wxFromCurrent; break;
-        case SEEK_END: mode = wxFromEnd; break;
-        default:       mode = wxFromCurrent; break;
-    }
-    
-    return (toff_t)stream->SeekI( (off_t)off, mode );
+
+    return wxFileOffsetToTIFF(stream->SeekI((wxFileOffset)off,
+                                            wxSeekModeFromTIFF(whence)));
+}
+
+toff_t TIFFLINKAGEMODE
+wxTIFFSeekOProc(thandle_t handle, toff_t off, int whence)
+{
+    wxOutputStream *stream = (wxOutputStream*) handle;
+
+    return wxFileOffsetToTIFF(stream->SeekO((wxFileOffset)off,
+                                            wxSeekModeFromTIFF(whence)));

 }
 
 }
 

-static int
-_tiffCloseProc(thandle_t WXUNUSED(handle))
+int TIFFLINKAGEMODE
+wxTIFFCloseIProc(thandle_t WXUNUSED(handle))

 {
 {

-    return 0;  // ?
+    // there is no need to close the input stream
+    return 0;

 }
 
 }
 

-static toff_t
-_tiffSizeProc(thandle_t handle)
+int TIFFLINKAGEMODE
+wxTIFFCloseOProc(thandle_t handle)

 {
 {

-    wxInputStream *stream = (wxInputStream*) handle;
+    wxOutputStream *stream = (wxOutputStream*) handle;
+
+    return stream->Close() ? 0 : -1;
+}
+
+toff_t TIFFLINKAGEMODE
+wxTIFFSizeProc(thandle_t handle)
+{
+    wxStreamBase *stream = (wxStreamBase*) handle;

     return (toff_t) stream->GetSize();
 }
 
     return (toff_t) stream->GetSize();
 }
 

-static int
-_tiffMapProc(thandle_t WXUNUSED(handle), tdata_t* pbase, toff_t* psize)
+int TIFFLINKAGEMODE
+wxTIFFMapProc(thandle_t WXUNUSED(handle),
+             tdata_t* WXUNUSED(pbase),
+             toff_t* WXUNUSED(psize))

 {
     return 0;
 }
 
 {
     return 0;
 }
 

-static void
-_tiffUnmapProc(thandle_t WXUNUSED(handle), tdata_t base, toff_t size)
+void TIFFLINKAGEMODE
+wxTIFFUnmapProc(thandle_t WXUNUSED(handle),
+               tdata_t WXUNUSED(base),
+               toff_t WXUNUSED(size))

 {
 }
 
 {
 }
 

+} // extern "C"
+

 TIFF*
 TIFFwxOpen(wxInputStream &stream, const char* name, const char* mode)
 {
     TIFF* tif = TIFFClientOpen(name, mode,
         (thandle_t) &stream,
 TIFF*
 TIFFwxOpen(wxInputStream &stream, const char* name, const char* mode)
 {
     TIFF* tif = TIFFClientOpen(name, mode,
         (thandle_t) &stream,

-        _tiffReadProc, _tiffWriteProc,
-        _tiffSeekProc, _tiffCloseProc, _tiffSizeProc,
-        _tiffMapProc, _tiffUnmapProc);
+        wxTIFFReadProc, wxTIFFNullProc,
+        wxTIFFSeekIProc, wxTIFFCloseIProc, wxTIFFSizeProc,
+        wxTIFFMapProc, wxTIFFUnmapProc);

 
 

-    if (tif)
-        tif->tif_fd = (int) &stream;
-       

     return tif;
 }
 
     return tif;
 }
 

+TIFF*
+TIFFwxOpen(wxOutputStream &stream, const char* name, const char* mode)
+{
+    TIFF* tif = TIFFClientOpen(name, mode,
+        (thandle_t) &stream,
+        wxTIFFNullProc, wxTIFFWriteProc,
+        wxTIFFSeekOProc, wxTIFFCloseOProc, wxTIFFSizeProc,
+        wxTIFFMapProc, wxTIFFUnmapProc);
+
+    return tif;
+}

 
 

-bool wxTIFFHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbose )
+bool wxTIFFHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbose, int index )

 {
 {

+    if (index == -1)
+        index = 0;
+

     image->Destroy();
     image->Destroy();

-    
+

     TIFF *tif = TIFFwxOpen( stream, "image", "r" );
     TIFF *tif = TIFFwxOpen( stream, "image", "r" );

-    
+

     if (!tif)
     {
         if (verbose)
     if (!tif)
     {
         if (verbose)

-            wxLogError( _("Error loading TIFF image.") );
-           
-       return FALSE;
+            wxLogError( _("TIFF: Error loading image.") );
+
+        return false;
+    }
+
+    if (!TIFFSetDirectory( tif, (tdir_t)index ))
+    {
+        if (verbose)
+            wxLogError( _("Invalid TIFF image index.") );
+
+        TIFFClose( tif );
+
+        return false;

     }
 
     uint32 w, h;
     }
 
     uint32 w, h;

-    size_t npixels;
+    uint32 npixels;

     uint32 *raster;
     uint32 *raster;

-    
+

     TIFFGetField( tif, TIFFTAG_IMAGEWIDTH, &w );
     TIFFGetField( tif, TIFFTAG_IMAGELENGTH, &h );
     TIFFGetField( tif, TIFFTAG_IMAGEWIDTH, &w );
     TIFFGetField( tif, TIFFTAG_IMAGELENGTH, &h );

-    
+
+    uint16 extraSamples;
+    uint16* samplesInfo;
+    TIFFGetFieldDefaulted(tif, TIFFTAG_EXTRASAMPLES,
+                          &extraSamples, &samplesInfo);
+    const bool hasAlpha = (extraSamples == 1 &&
+                           (samplesInfo[0] == EXTRASAMPLE_ASSOCALPHA ||
+                            samplesInfo[0] == EXTRASAMPLE_UNASSALPHA));
+

     npixels = w * h;
     npixels = w * h;

-    
+

     raster = (uint32*) _TIFFmalloc( npixels * sizeof(uint32) );
     raster = (uint32*) _TIFFmalloc( npixels * sizeof(uint32) );

-    
+

     if (!raster)
     {
         if (verbose)
     if (!raster)
     {
         if (verbose)

-            wxLogError( _("Not enough memory for loading TIFF image.") );
-           
-       return FALSE;
+            wxLogError( _("TIFF: Couldn't allocate memory.") );
+
+        TIFFClose( tif );
+
+        return false;

     }
 
     }
 

-    image->Create( w, h );
-    if (!image->Ok()) 
+    image->Create( (int)w, (int)h );
+    if (!image->Ok())

     {
         if (verbose)
     {
         if (verbose)

-            wxLogError( _("Not enough memory for loading TIFF image.") );
-           
-       _TIFFfree( raster );
-       
-        return FALSE;
+            wxLogError( _("TIFF: Couldn't allocate memory.") );
+
+        _TIFFfree( raster );
+        TIFFClose( tif );
+
+        return false;

     }
     }

-    
+
+    if ( hasAlpha )
+        image->SetAlpha();
+

     if (!TIFFReadRGBAImage( tif, w, h, raster, 0 ))
     {
         if (verbose)
     if (!TIFFReadRGBAImage( tif, w, h, raster, 0 ))
     {
         if (verbose)

-            wxLogError( _("Error reading TIFF image.") );
-           
-       _TIFFfree( raster );
-       image->Destroy();
-       
-       return FALSE;
+            wxLogError( _("TIFF: Error reading image.") );
+
+        _TIFFfree( raster );
+        image->Destroy();
+        TIFFClose( tif );
+
+        return false;

     }
     }

-    
-    bool hasmask = FALSE;
-    
+

     unsigned char *ptr = image->GetData();
     unsigned char *ptr = image->GetData();

+    ptr += w*3*(h-1);
+
+    unsigned char *alpha = hasAlpha ? image->GetAlpha() : NULL;
+    if ( hasAlpha )
+        alpha += w*(h-1);
+

     uint32 pos = 0;
     uint32 pos = 0;

-    
+

     for (uint32 i = 0; i < h; i++)
     {
     for (uint32 i = 0; i < h; i++)
     {

-        for (uint32 j = 0; w < h; j++)
-       {
-           unsigned char alpha = (unsigned char)(raster[pos] >> 24);
-           if (alpha < 127)
-           {
-               hasmask = TRUE;
-               ptr[0] = image->GetMaskRed();
-               ptr++;
-               ptr[0] = image->GetMaskGreen();
-               ptr++;
-               ptr[0] = image->GetMaskBlue();
-               ptr++;
-           }
-           else
-           {
-               ptr[0] = (unsigned char)(raster[pos] >> 16);
-               ptr++;
-               ptr[0] = (unsigned char)(raster[pos] >> 8);
-               ptr++;
-               ptr[0] = (unsigned char)(raster[pos]);
-               ptr++;
-           }
-           pos++;
-       }
+        for (uint32 j = 0; j < w; j++)
+        {
+            *(ptr++) = (unsigned char)TIFFGetR(raster[pos]);
+            *(ptr++) = (unsigned char)TIFFGetG(raster[pos]);
+            *(ptr++) = (unsigned char)TIFFGetB(raster[pos]);
+            if ( hasAlpha )
+                *(alpha++) = (unsigned char)TIFFGetA(raster[pos]);
+
+            pos++;
+        }
+
+        // subtract line we just added plus one line:
+        ptr -= 2*w*3;
+        if ( hasAlpha )
+            alpha -= 2*w;
+    }
+
+    // set the image resolution if it's available
+    uint16 tiffRes;
+    if ( TIFFGetField(tif, TIFFTAG_RESOLUTIONUNIT, &tiffRes) )
+    {
+        wxImageResolution res;
+        switch ( tiffRes )
+        {
+            default:
+                wxLogWarning(_("Unknown TIFF resolution unit %d ignored"),
+                             tiffRes);
+                // fall through
+
+            case RESUNIT_NONE:
+                res = wxIMAGE_RESOLUTION_NONE;
+                break;
+
+            case RESUNIT_INCH:
+                res = wxIMAGE_RESOLUTION_INCHES;
+                break;
+
+            case RESUNIT_CENTIMETER:
+                res = wxIMAGE_RESOLUTION_CM;
+                break;
+        }
+
+        if ( res != wxIMAGE_RESOLUTION_NONE )
+        {
+            float xres, yres;
+            if ( TIFFGetField(tif, TIFFTAG_XRESOLUTION, &xres) )
+                image->SetOption(wxIMAGE_OPTION_RESOLUTIONX, wxRound(xres));
+
+            if ( TIFFGetField(tif, TIFFTAG_YRESOLUTION, &yres) )
+                image->SetOption(wxIMAGE_OPTION_RESOLUTIONY, wxRound(yres));
+        }

     }
     }

-    
+
+

     _TIFFfree( raster );
     _TIFFfree( raster );

-    
+

     TIFFClose( tif );
     TIFFClose( tif );

-       
-    image->SetMask( hasmask );
-    
-    return TRUE;
+
+    return true;

 }
 
 }
 

+int wxTIFFHandler::GetImageCount( wxInputStream& stream )
+{
+    TIFF *tif = TIFFwxOpen( stream, "image", "r" );

 
 

+    if (!tif)
+        return 0;

 
 

-bool wxTIFFHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbose )
-{
-    return FALSE;
+    int dircount = 0;  // according to the libtiff docs, dircount should be set to 1 here???
+    do {
+        dircount++;
+    } while (TIFFReadDirectory(tif));
+
+    TIFFClose( tif );
+
+    return dircount;

 }
 
 }
 

-bool wxTIFFHandler::DoCanRead( wxInputStream& stream )
+bool wxTIFFHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbose )

 {
 {

-    unsigned char hdr[2];
+    TIFF *tif = TIFFwxOpen( stream, "image", "w" );

 
 

-    stream.Read(&hdr, 2);
-    stream.SeekI(-2, wxFromCurrent);
-    
-    return ((hdr[0] == 0x49 && hdr[1] == 0x49) ||
-            (hdr[0] == 0x4D && hdr[1] == 0x4D));
-}
+    if (!tif)
+    {
+        if (verbose)
+            wxLogError( _("TIFF: Error saving image.") );

 
 

+        return false;
+    }

 
 

-#endif
-   // wxUSE_LIBTIFF
+    TIFFSetField(tif, TIFFTAG_ORIENTATION, ORIENTATION_TOPLEFT);
+    TIFFSetField(tif, TIFFTAG_IMAGEWIDTH,  (uint32)image->GetWidth());
+    TIFFSetField(tif, TIFFTAG_IMAGELENGTH, (uint32)image->GetHeight());
+    TIFFSetField(tif, TIFFTAG_ORIENTATION, ORIENTATION_TOPLEFT);
+    TIFFSetField(tif, TIFFTAG_PLANARCONFIG, PLANARCONFIG_CONTIG);
+
+    // save the image resolution if we have it
+    int xres, yres;
+    const wxImageResolution res = GetResolutionFromOptions(*image, &xres, &yres);
+    uint16 tiffRes;
+    switch ( res )
+    {
+        default:
+            wxFAIL_MSG( _T("unknown image resolution units") );
+            // fall through
+
+        case wxIMAGE_RESOLUTION_NONE:
+            tiffRes = RESUNIT_NONE;
+            break;
+
+        case wxIMAGE_RESOLUTION_INCHES:
+            tiffRes = RESUNIT_INCH;
+            break;
+
+        case wxIMAGE_RESOLUTION_CM:
+            tiffRes = RESUNIT_CENTIMETER;
+            break;
+    }
+
+    if ( tiffRes != RESUNIT_NONE )
+    {
+        TIFFSetField(tif, TIFFTAG_RESOLUTIONUNIT, tiffRes);
+        TIFFSetField(tif, TIFFTAG_XRESOLUTION, (float)xres);
+        TIFFSetField(tif, TIFFTAG_YRESOLUTION, (float)yres);
+    }

 
 
 
 

+    int spp = image->GetOptionInt(wxIMAGE_OPTION_SAMPLESPERPIXEL);
+    if ( !spp )
+        spp = 3;
+
+    int bpp = image->GetOptionInt(wxIMAGE_OPTION_BITSPERSAMPLE);
+    if ( !bpp )
+        bpp = 8;
+
+    int compression = image->GetOptionInt(wxIMAGE_OPTION_COMPRESSION);
+    if ( !compression )
+    {
+        // we can't use COMPRESSION_LZW because current version of libtiff
+        // doesn't implement it ("no longer implemented due to Unisys patent
+        // enforcement") and other compression methods are lossy so we
+        // shouldn't use them by default -- and the only remaining one is none
+        compression = COMPRESSION_NONE;
+    }
+
+    TIFFSetField(tif, TIFFTAG_SAMPLESPERPIXEL, spp);
+    TIFFSetField(tif, TIFFTAG_BITSPERSAMPLE, bpp);
+    TIFFSetField(tif, TIFFTAG_PHOTOMETRIC, spp*bpp == 1 ? PHOTOMETRIC_MINISBLACK
+                                                        : PHOTOMETRIC_RGB);
+    TIFFSetField(tif, TIFFTAG_COMPRESSION, compression);
+
+    // scanlinesize if determined by spp and bpp
+    tsize_t linebytes = (tsize_t)image->GetWidth() * spp * bpp / 8;
+
+    if ( (image->GetWidth() % 8 > 0) && (spp * bpp < 8) )
+        linebytes+=1;
+
+    unsigned char *buf;
+
+    if (TIFFScanlineSize(tif) > linebytes || (spp * bpp < 24))
+    {
+        buf = (unsigned char *)_TIFFmalloc(TIFFScanlineSize(tif));
+        if (!buf)
+        {
+            if (verbose)
+                wxLogError( _("TIFF: Couldn't allocate memory.") );

 
 

+            TIFFClose( tif );

 
 

+            return false;
+        }
+    }
+    else
+    {
+        buf = NULL;
+    }
+
+    TIFFSetField(tif, TIFFTAG_ROWSPERSTRIP,TIFFDefaultStripSize(tif, (uint32) -1));
+
+    unsigned char *ptr = image->GetData();
+    for ( int row = 0; row < image->GetHeight(); row++ )
+    {
+        if ( buf )
+        {
+            if ( spp * bpp > 1 )
+            {
+                // color image
+                memcpy(buf, ptr, image->GetWidth());
+            }
+            else // black and white image
+            {
+                for ( int column = 0; column < linebytes; column++ )
+                {
+                    uint8 reverse = 0;
+                    for ( int bp = 0; bp < 8; bp++ )
+                    {
+                        if ( ptr[column*24 + bp*3] > 0 )
+                        {
+                            // check only red as this is sufficient
+                            reverse = (uint8)(reverse | 128 >> bp);
+                        }
+                    }
+
+                    buf[column] = reverse;
+                }
+            }
+        }
+
+        if ( TIFFWriteScanline(tif, buf ? buf : ptr, (uint32)row, 0) < 0 )
+        {
+            if (verbose)
+                wxLogError( _("TIFF: Error writing image.") );
+
+            TIFFClose( tif );
+            if (buf)
+                _TIFFfree(buf);
+
+            return false;
+        }
+
+        ptr += image->GetWidth()*3;
+    }
+
+    (void) TIFFClose(tif);
+
+    if (buf)
+        _TIFFfree(buf);
+
+    return true;
+}
+
+bool wxTIFFHandler::DoCanRead( wxInputStream& stream )
+{
+    unsigned char hdr[2];
+
+    if ( !stream.Read(&hdr[0], WXSIZEOF(hdr)) )
+        return false;
+
+    return (hdr[0] == 'I' && hdr[1] == 'I') ||
+           (hdr[0] == 'M' && hdr[1] == 'M');
+}

 
 

+#endif  // wxUSE_STREAMS

 
 

+#endif  // wxUSE_LIBTIFF