By default, align renderers as column header under GTK+, too.

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

diff --git a/src/common/imagtiff.cpp b/src/common/imagtiff.cpp
index 30865e12bdc6ed8624e3bac34abcfb5d4957ef6d..3a5e63fb5e93e11a228052b065599cff03c6bfd6 100644 (file)
--- a/src/common/imagtiff.cpp
+++ b/src/common/imagtiff.cpp
@@ -1,5 +1,5 @@
 /////////////////////////////////////////////////////////////////////////////
 /////////////////////////////////////////////////////////////////////////////

-// Name:        imagtiff.cpp
+// Name:        src/common/imagtiff.cpp

 // Purpose:     wxImage TIFF handler
 // Author:      Robert Roebling
 // RCS-ID:      $Id$
 // Purpose:     wxImage TIFF handler
 // Author:      Robert Roebling
 // RCS-ID:      $Id$


@@ -7,53 +7,153 @@
 // Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 
 // Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 

-#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
-#pragma implementation "imagtiff.h"
-#endif
+// ============================================================================
+// 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_IMAGE && wxUSE_LIBTIFF
 
 #include "wx/imagtiff.h"

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

 extern "C"
 {
 extern "C"
 {

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

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

-#include "wx/intl.h"
-#include "wx/module.h"

 
 #ifndef TIFFLINKAGEMODE
 
 #ifndef TIFFLINKAGEMODE

-  #define TIFFLINKAGEMODE LINKAGEMODE
+    #if defined(__WATCOMC__) && defined(__WXMGL__)
+        #define TIFFLINKAGEMODE cdecl
+    #else
+        #define TIFFLINKAGEMODE LINKAGEMODE
+    #endif

 #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
 //-----------------------------------------------------------------------------
 
 IMPLEMENT_DYNAMIC_CLASS(wxTIFFHandler,wxImageHandler)
 
 //-----------------------------------------------------------------------------
 // wxTIFFHandler
 //-----------------------------------------------------------------------------
 
 IMPLEMENT_DYNAMIC_CLASS(wxTIFFHandler,wxImageHandler)
 

+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
 
 #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
 extern "C"
 {
 
 tsize_t TIFFLINKAGEMODE

-_tiffNullProc(thandle_t WXUNUSED(handle),
+wxTIFFNullProc(thandle_t WXUNUSED(handle),

           tdata_t WXUNUSED(buf),
           tsize_t WXUNUSED(size))
 {
           tdata_t WXUNUSED(buf),
           tsize_t WXUNUSED(size))
 {


@@ -61,68 +161,63 @@ _tiffNullProc(thandle_t WXUNUSED(handle),
 }
 
 tsize_t TIFFLINKAGEMODE
 }
 
 tsize_t TIFFLINKAGEMODE

-_tiffReadProc(thandle_t handle, tdata_t buf, tsize_t size)
+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());

 }
 
 tsize_t TIFFLINKAGEMODE
 }
 
 tsize_t TIFFLINKAGEMODE

-_tiffWriteProc(thandle_t handle, tdata_t buf, tsize_t size)
+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());

 }
 
 toff_t TIFFLINKAGEMODE
 }
 
 toff_t TIFFLINKAGEMODE

-_tiffSeekIProc(thandle_t handle, toff_t off, int whence)
+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( (wxFileOffset)off, mode );
+    return wxFileOffsetToTIFF(stream->SeekI((wxFileOffset)off,
+                                            wxSeekModeFromTIFF(whence)));

 }
 
 toff_t TIFFLINKAGEMODE
 }
 
 toff_t TIFFLINKAGEMODE

-_tiffSeekOProc(thandle_t handle, toff_t off, int whence)
+wxTIFFSeekOProc(thandle_t handle, toff_t off, int whence)

 {
     wxOutputStream *stream = (wxOutputStream*) handle;
 {
     wxOutputStream *stream = (wxOutputStream*) 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->SeekO( (wxFileOffset)off, mode );
+    return wxFileOffsetToTIFF(stream->SeekO((wxFileOffset)off,
+                                            wxSeekModeFromTIFF(whence)));
+}
+
+int TIFFLINKAGEMODE
+wxTIFFCloseIProc(thandle_t WXUNUSED(handle))
+{
+    // there is no need to close the input stream
+    return 0;

 }
 
 int TIFFLINKAGEMODE
 }
 
 int TIFFLINKAGEMODE

-_tiffCloseProc(thandle_t WXUNUSED(handle))
+wxTIFFCloseOProc(thandle_t handle)

 {
 {

-    return 0;  // ?
+    wxOutputStream *stream = (wxOutputStream*) handle;
+
+    return stream->Close() ? 0 : -1;

 }
 
 toff_t TIFFLINKAGEMODE
 }
 
 toff_t TIFFLINKAGEMODE

-_tiffSizeProc(thandle_t handle)
+wxTIFFSizeProc(thandle_t handle)

 {
     wxStreamBase *stream = (wxStreamBase*) handle;
     return (toff_t) stream->GetSize();
 }
 
 int TIFFLINKAGEMODE
 {
     wxStreamBase *stream = (wxStreamBase*) handle;
     return (toff_t) stream->GetSize();
 }
 
 int TIFFLINKAGEMODE

-_tiffMapProc(thandle_t WXUNUSED(handle),
+wxTIFFMapProc(thandle_t WXUNUSED(handle),

              tdata_t* WXUNUSED(pbase),
              toff_t* WXUNUSED(psize))
 {
              tdata_t* WXUNUSED(pbase),
              toff_t* WXUNUSED(psize))
 {


@@ -130,44 +225,12 @@ _tiffMapProc(thandle_t WXUNUSED(handle),
 }
 
 void TIFFLINKAGEMODE
 }
 
 void TIFFLINKAGEMODE

-_tiffUnmapProc(thandle_t WXUNUSED(handle),
+wxTIFFUnmapProc(thandle_t WXUNUSED(handle),

                tdata_t WXUNUSED(base),
                toff_t WXUNUSED(size))
 {
 }
 
                tdata_t WXUNUSED(base),
                toff_t WXUNUSED(size))
 {
 }
 

-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"
 
 TIFF*
 } // extern "C"
 
 TIFF*


@@ -175,9 +238,9 @@ TIFFwxOpen(wxInputStream &stream, const char* name, const char* mode)
 {
     TIFF* tif = TIFFClientOpen(name, mode,
         (thandle_t) &stream,
 {
     TIFF* tif = TIFFClientOpen(name, mode,
         (thandle_t) &stream,

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

 
     return tif;
 }
 
     return tif;
 }


@@ -187,23 +250,13 @@ TIFFwxOpen(wxOutputStream &stream, const char* name, const char* mode)
 {
     TIFF* tif = TIFFClientOpen(name, mode,
         (thandle_t) &stream,
 {
     TIFF* tif = TIFFClientOpen(name, mode,
         (thandle_t) &stream,

-        _tiffNullProc, _tiffWriteProc,
-        _tiffSeekOProc, _tiffCloseProc, _tiffSizeProc,
-        _tiffMapProc, _tiffUnmapProc);
+        wxTIFFNullProc, wxTIFFWriteProc,
+        wxTIFFSeekOProc, wxTIFFCloseOProc, wxTIFFSizeProc,
+        wxTIFFMapProc, wxTIFFUnmapProc);

 
     return tif;
 }
 
 
     return tif;
 }
 

-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);
-}
-

 bool wxTIFFHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbose, int index )
 {
     if (index == -1)
 bool wxTIFFHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbose, int index )
 {
     if (index == -1)


@@ -238,6 +291,14 @@ bool wxTIFFHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbos
     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;
 
     raster = (uint32*) _TIFFmalloc( npixels * sizeof(uint32) );
     npixels = w * h;
 
     raster = (uint32*) _TIFFmalloc( npixels * sizeof(uint32) );


@@ -264,6 +325,9 @@ bool wxTIFFHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbos
         return false;
     }
 
         return false;
     }
 

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

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


@@ -276,47 +340,75 @@ bool wxTIFFHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbos
         return false;
     }
 
         return false;
     }
 

-    bool hasmask = false;
-

     unsigned char *ptr = image->GetData();
     ptr += w*3*(h-1);
     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;
 
     for (uint32 i = 0; i < h; i++)
     {
         for (uint32 j = 0; j < w; j++)
         {
     uint32 pos = 0;
 
     for (uint32 i = 0; i < h; i++)
     {
         for (uint32 j = 0; j < w; j++)
         {

-            unsigned char alpha = (unsigned char)TIFFGetA(raster[pos]);
-            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)TIFFGetR(raster[pos]);
-                ptr++;
-                ptr[0] = (unsigned char)TIFFGetG(raster[pos]);
-                ptr++;
-                ptr[0] = (unsigned char)TIFFGetB(raster[pos]);
-                ptr++;
-            }
+            *(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++;
         }
             pos++;
         }

-        ptr -= 2*w*3; // subtract line we just added plus one line
+
+        // 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 );
 
     TIFFClose( tif );
 
     _TIFFfree( raster );
 
     TIFFClose( tif );
 

-    image->SetMask( hasmask );
-

     return true;
 }
 
     return true;
 }
 


@@ -355,26 +447,54 @@ bool wxTIFFHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbo
     TIFFSetField(tif, TIFFTAG_ORIENTATION, ORIENTATION_TOPLEFT);
     TIFFSetField(tif, TIFFTAG_PLANARCONFIG, PLANARCONFIG_CONTIG);
 
     TIFFSetField(tif, TIFFTAG_ORIENTATION, ORIENTATION_TOPLEFT);
     TIFFSetField(tif, TIFFTAG_PLANARCONFIG, PLANARCONFIG_CONTIG);
 

-    if ( image->HasOption(wxIMAGE_OPTION_RESOLUTIONX) &&
-            image->HasOption(wxIMAGE_OPTION_RESOLUTIONY) )
+    // save the image resolution if we have it
+    int xres, yres;
+    const wxImageResolution res = GetResolutionFromOptions(*image, &xres, &yres);
+    uint16 tiffRes;
+    switch ( res )

     {
     {

-        TIFFSetField(tif, TIFFTAG_XRESOLUTION,
-                        (float)image->GetOptionInt(wxIMAGE_OPTION_RESOLUTIONX));
-        TIFFSetField(tif, TIFFTAG_YRESOLUTION,
-                        (float)image->GetOptionInt(wxIMAGE_OPTION_RESOLUTIONY));
+        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 )
     int spp = image->GetOptionInt(wxIMAGE_OPTION_SAMPLESPERPIXEL);
     if ( !spp )
         spp = 3;
 
     int bpp = image->GetOptionInt(wxIMAGE_OPTION_BITSPERSAMPLE);
     if ( !bpp )

-        bpp=8;
+        bpp = 8;

 
     int compression = image->GetOptionInt(wxIMAGE_OPTION_COMPRESSION);
     if ( !compression )
 
     int compression = image->GetOptionInt(wxIMAGE_OPTION_COMPRESSION);
     if ( !compression )

-        compression=COMPRESSION_LZW;
+    {
+        // 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_SAMPLESPERPIXEL, spp);
     TIFFSetField(tif, TIFFTAG_BITSPERSAMPLE, bpp);


@@ -430,7 +550,7 @@ bool wxTIFFHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbo
                         if ( ptr[column*24 + bp*3] > 0 )
                         {
                             // check only red as this is sufficient
                         if ( ptr[column*24 + bp*3] > 0 )
                         {
                             // check only red as this is sufficient

-                            reverse = reverse | 128 >> bp;
+                            reverse = (uint8)(reverse | 128 >> bp);

                         }
                     }
 
                         }
                     }
 


@@ -476,4 +596,3 @@ bool wxTIFFHandler::DoCanRead( wxInputStream& stream )
 #endif  // wxUSE_STREAMS
 
 #endif  // wxUSE_LIBTIFF
 #endif  // wxUSE_STREAMS
 
 #endif  // wxUSE_LIBTIFF

-