src/common/imagtiff.cpp

/////////////////////////////////////////////////////////////////////////////
// Name:        src/common/imagtiff.cpp
// Purpose:     wxImage TIFF handler
// Author:      Robert Roebling
// RCS-ID:      $Id$
// Copyright:   (c) Robert Roebling
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

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

#ifdef __BORLANDC__
    #pragma hdrstop
#endif

#if wxUSE_IMAGE && wxUSE_LIBTIFF

#include "wx/imagtiff.h"

#ifndef WX_PRECOMP
    #include "wx/log.h"
    #include "wx/app.h"
    #include "wx/intl.h"
#endif

#include "wx/bitmap.h"

extern "C"
{
    #include "tiff.h"
    #include "tiffio.h"
}
#include "wx/filefn.h"
#include "wx/wfstream.h"
#include "wx/module.h"

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

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

IMPLEMENT_DYNAMIC_CLASS(wxTIFFHandler,wxImageHandler)

#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
_tiffNullProc(thandle_t WXUNUSED(handle),
          tdata_t WXUNUSED(buf),
          tsize_t WXUNUSED(size))
{
    return (tsize_t) -1;
}

tsize_t TIFFLINKAGEMODE
_tiffReadProc(thandle_t handle, tdata_t buf, tsize_t size)
{
    wxInputStream *stream = (wxInputStream*) handle;
    stream->Read( (void*) buf, (size_t) size );
    return wx_truncate_cast(tsize_t, stream->LastRead());
}

tsize_t TIFFLINKAGEMODE
_tiffWriteProc(thandle_t handle, tdata_t buf, tsize_t size)
{
    wxOutputStream *stream = (wxOutputStream*) handle;
    stream->Write( (void*) buf, (size_t) size );
    return wx_truncate_cast(tsize_t, stream->LastWrite());
}

toff_t TIFFLINKAGEMODE
_tiffSeekIProc(thandle_t handle, toff_t off, int whence)
{
    wxInputStream *stream = (wxInputStream*) handle;

    return wxFileOffsetToTIFF(stream->SeekI((wxFileOffset)off,
                                            wxSeekModeFromTIFF(whence)));
}

toff_t TIFFLINKAGEMODE
_tiffSeekOProc(thandle_t handle, toff_t off, int whence)
{
    wxOutputStream *stream = (wxOutputStream*) handle;

    return wxFileOffsetToTIFF(stream->SeekO((wxFileOffset)off,
                                            wxSeekModeFromTIFF(whence)));
}

int TIFFLINKAGEMODE
_tiffCloseProc(thandle_t WXUNUSED(handle))
{
    return 0;  // ?
}

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

int TIFFLINKAGEMODE
_tiffMapProc(thandle_t WXUNUSED(handle),
             tdata_t* WXUNUSED(pbase),
             toff_t* WXUNUSED(psize))
{
    return 0;
}

void TIFFLINKAGEMODE
_tiffUnmapProc(thandle_t WXUNUSED(handle),
               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*
TIFFwxOpen(wxInputStream &stream, const char* name, const char* mode)
{
    TIFF* tif = TIFFClientOpen(name, mode,
        (thandle_t) &stream,
        _tiffReadProc, _tiffNullProc,
        _tiffSeekIProc, _tiffCloseProc, _tiffSizeProc,
        _tiffMapProc, _tiffUnmapProc);

    return tif;
}

TIFF*
TIFFwxOpen(wxOutputStream &stream, const char* name, const char* mode)
{
    TIFF* tif = TIFFClientOpen(name, mode,
        (thandle_t) &stream,
        _tiffNullProc, _tiffWriteProc,
        _tiffSeekOProc, _tiffCloseProc, _tiffSizeProc,
        _tiffMapProc, _tiffUnmapProc);

    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)
        index = 0;

    image->Destroy();

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

    if (!tif)
    {
        if (verbose)
            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 npixels;
    uint32 *raster;

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

    npixels = w * h;

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

    if (!raster)
    {
        if (verbose)
            wxLogError( _("TIFF: Couldn't allocate memory.") );

        TIFFClose( tif );

        return false;
    }

    image->Create( (int)w, (int)h );
    if (!image->Ok())
    {
        if (verbose)
            wxLogError( _("TIFF: Couldn't allocate memory.") );

        _TIFFfree( raster );
        TIFFClose( tif );

        return false;
    }

    if (!TIFFReadRGBAImage( tif, w, h, raster, 0 ))
    {
        if (verbose)
            wxLogError( _("TIFF: Error reading image.") );

        _TIFFfree( raster );
        image->Destroy();
        TIFFClose( tif );

        return false;
    }

    bool hasmask = false;

    unsigned char *ptr = image->GetData();
    ptr += w*3*(h-1);
    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++;
            }
            pos++;
        }
        ptr -= 2*w*3; // subtract line we just added plus one line
    }

    _TIFFfree( raster );

    TIFFClose( tif );

    image->SetMask( hasmask );

    return true;
}

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

    if (!tif)
        return 0;

    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::SaveFile( wxImage *image, wxOutputStream& stream, bool verbose )
{
    TIFF *tif = TIFFwxOpen( stream, "image", "w" );

    if (!tif)
    {
        if (verbose)
            wxLogError( _("TIFF: Error saving image.") );

        return false;
    }

    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);

    if ( image->HasOption(wxIMAGE_OPTION_RESOLUTIONX) &&
            image->HasOption(wxIMAGE_OPTION_RESOLUTIONY) )
    {
        TIFFSetField(tif, TIFFTAG_XRESOLUTION,
                        (float)image->GetOptionInt(wxIMAGE_OPTION_RESOLUTIONX));
        TIFFSetField(tif, TIFFTAG_YRESOLUTION,
                        (float)image->GetOptionInt(wxIMAGE_OPTION_RESOLUTIONY));
    }

    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
Commit	Line	Data
	1	/////////////////////////////////////////////////////////////////////////////
	2	// Name: src/common/imagtiff.cpp
	3	// Purpose: wxImage TIFF handler
	4	// Author: Robert Roebling
	5	// RCS-ID: $Id$
	6	// Copyright: (c) Robert Roebling
	7	// Licence: wxWindows licence
	8	/////////////////////////////////////////////////////////////////////////////
	9
	10	// For compilers that support precompilation, includes "wx.h".
	11	#include "wx/wxprec.h"
	12
	13	#ifdef __BORLANDC__
	14	#pragma hdrstop
	15	#endif
	16
	17	#if wxUSE_IMAGE && wxUSE_LIBTIFF
	18
	19	#include "wx/imagtiff.h"
	20
	21	#ifndef WX_PRECOMP
	22	#include "wx/log.h"
	23	#include "wx/app.h"
	24	#include "wx/intl.h"
	25	#endif
	26
	27	#include "wx/bitmap.h"
	28
	29	extern "C"
	30	{
	31	#include "tiff.h"
	32	#include "tiffio.h"
	33	}
	34	#include "wx/filefn.h"
	35	#include "wx/wfstream.h"
	36	#include "wx/module.h"
	37
	38	#ifndef TIFFLINKAGEMODE
	39	#if defined(__WATCOMC__) && defined(__WXMGL__)
	40	#define TIFFLINKAGEMODE cdecl
	41	#else
	42	#define TIFFLINKAGEMODE LINKAGEMODE
	43	#endif
	44	#endif
	45
	46	//-----------------------------------------------------------------------------
	47	// wxTIFFHandler
	48	//-----------------------------------------------------------------------------
	49
	50	IMPLEMENT_DYNAMIC_CLASS(wxTIFFHandler,wxImageHandler)
	51
	52	#if wxUSE_STREAMS
	53
	54	// helper to translate our, possibly 64 bit, wxFileOffset to TIFF, always 32
	55	// bit, toff_t
	56	static toff_t wxFileOffsetToTIFF(wxFileOffset ofs)
	57	{
	58	if ( ofs == wxInvalidOffset )
	59	return (toff_t)-1;
	60
	61	toff_t tofs = wx_truncate_cast(toff_t, ofs);
	62	wxCHECK_MSG( (wxFileOffset)tofs == ofs, (toff_t)-1,
	63	_T("TIFF library doesn't support large files") );
	64
	65	return tofs;
	66	}
	67
	68	// another helper to convert standard seek mode to our
	69	static wxSeekMode wxSeekModeFromTIFF(int whence)
	70	{
	71	switch ( whence )
	72	{
	73	case SEEK_SET:
	74	return wxFromStart;
	75
	76	case SEEK_CUR:
	77	return wxFromCurrent;
	78
	79	case SEEK_END:
	80	return wxFromEnd;
	81
	82	default:
	83	return wxFromCurrent;
	84	}
	85	}
	86
	87	extern "C"
	88	{
	89
	90	tsize_t TIFFLINKAGEMODE
	91	_tiffNullProc(thandle_t WXUNUSED(handle),
	92	tdata_t WXUNUSED(buf),
	93	tsize_t WXUNUSED(size))
	94	{
	95	return (tsize_t) -1;
	96	}
	97
	98	tsize_t TIFFLINKAGEMODE
	99	_tiffReadProc(thandle_t handle, tdata_t buf, tsize_t size)
	100	{
	101	wxInputStream stream = (wxInputStream) handle;
	102	stream->Read( (void*) buf, (size_t) size );
	103	return wx_truncate_cast(tsize_t, stream->LastRead());
	104	}
	105
	106	tsize_t TIFFLINKAGEMODE
	107	_tiffWriteProc(thandle_t handle, tdata_t buf, tsize_t size)
	108	{
	109	wxOutputStream stream = (wxOutputStream) handle;
	110	stream->Write( (void*) buf, (size_t) size );
	111	return wx_truncate_cast(tsize_t, stream->LastWrite());
	112	}
	113
	114	toff_t TIFFLINKAGEMODE
	115	_tiffSeekIProc(thandle_t handle, toff_t off, int whence)
	116	{
	117	wxInputStream stream = (wxInputStream) handle;
	118
	119	return wxFileOffsetToTIFF(stream->SeekI((wxFileOffset)off,
	120	wxSeekModeFromTIFF(whence)));
	121	}
	122
	123	toff_t TIFFLINKAGEMODE
	124	_tiffSeekOProc(thandle_t handle, toff_t off, int whence)
	125	{
	126	wxOutputStream stream = (wxOutputStream) handle;
	127
	128	return wxFileOffsetToTIFF(stream->SeekO((wxFileOffset)off,
	129	wxSeekModeFromTIFF(whence)));
	130	}
	131
	132	int TIFFLINKAGEMODE
	133	_tiffCloseProc(thandle_t WXUNUSED(handle))
	134	{
	135	return 0; // ?
	136	}
	137
	138	toff_t TIFFLINKAGEMODE
	139	_tiffSizeProc(thandle_t handle)
	140	{
	141	wxStreamBase stream = (wxStreamBase) handle;
	142	return (toff_t) stream->GetSize();
	143	}
	144
	145	int TIFFLINKAGEMODE
	146	_tiffMapProc(thandle_t WXUNUSED(handle),
	147	tdata_t* WXUNUSED(pbase),
	148	toff_t* WXUNUSED(psize))
	149	{
	150	return 0;
	151	}
	152
	153	void TIFFLINKAGEMODE
	154	_tiffUnmapProc(thandle_t WXUNUSED(handle),
	155	tdata_t WXUNUSED(base),
	156	toff_t WXUNUSED(size))
	157	{
	158	}
	159
	160	static void
	161	TIFFwxWarningHandler(const char* module,
	162	const char* WXUNUSED_IN_UNICODE(fmt),
	163	va_list WXUNUSED_IN_UNICODE(ap))
	164	{
	165	if (module != NULL)
	166	wxLogWarning(_("tiff module: %s"), wxString::FromAscii(module).c_str());
	167
	168	// FIXME: this is not terrible informative but better than crashing!
	169	#if wxUSE_UNICODE
	170	wxLogWarning(_("TIFF library warning."));
	171	#else
	172	wxVLogWarning(fmt, ap);
	173	#endif
	174	}
	175
	176	static void
	177	TIFFwxErrorHandler(const char* module,
	178	const char* WXUNUSED_IN_UNICODE(fmt),
	179	va_list WXUNUSED_IN_UNICODE(ap))
	180	{
	181	if (module != NULL)
	182	wxLogError(_("tiff module: %s"), wxString::FromAscii(module).c_str());
	183
	184	// FIXME: as above
	185	#if wxUSE_UNICODE
	186	wxLogError(_("TIFF library error."));
	187	#else
	188	wxVLogError(fmt, ap);
	189	#endif
	190	}
	191
	192	} // extern "C"
	193
	194	TIFF*
	195	TIFFwxOpen(wxInputStream &stream, const char* name, const char* mode)
	196	{
	197	TIFF* tif = TIFFClientOpen(name, mode,
	198	(thandle_t) &stream,
	199	_tiffReadProc, _tiffNullProc,
	200	_tiffSeekIProc, _tiffCloseProc, _tiffSizeProc,
	201	_tiffMapProc, _tiffUnmapProc);
	202
	203	return tif;
	204	}
	205
	206	TIFF*
	207	TIFFwxOpen(wxOutputStream &stream, const char* name, const char* mode)
	208	{
	209	TIFF* tif = TIFFClientOpen(name, mode,
	210	(thandle_t) &stream,
	211	_tiffNullProc, _tiffWriteProc,
	212	_tiffSeekOProc, _tiffCloseProc, _tiffSizeProc,
	213	_tiffMapProc, _tiffUnmapProc);
	214
	215	return tif;
	216	}
	217
	218	wxTIFFHandler::wxTIFFHandler()
	219	{
	220	m_name = wxT("TIFF file");
	221	m_extension = wxT("tif");
	222	m_type = wxBITMAP_TYPE_TIF;
	223	m_mime = wxT("image/tiff");
	224	TIFFSetWarningHandler((TIFFErrorHandler) TIFFwxWarningHandler);
	225	TIFFSetErrorHandler((TIFFErrorHandler) TIFFwxErrorHandler);
	226	}
	227
	228	bool wxTIFFHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbose, int index )
	229	{
	230	if (index == -1)
	231	index = 0;
	232
	233	image->Destroy();
	234
	235	TIFF *tif = TIFFwxOpen( stream, "image", "r" );
	236
	237	if (!tif)
	238	{
	239	if (verbose)
	240	wxLogError( _("TIFF: Error loading image.") );
	241
	242	return false;
	243	}
	244
	245	if (!TIFFSetDirectory( tif, (tdir_t)index ))
	246	{
	247	if (verbose)
	248	wxLogError( _("Invalid TIFF image index.") );
	249
	250	TIFFClose( tif );
	251
	252	return false;
	253	}
	254
	255	uint32 w, h;
	256	uint32 npixels;
	257	uint32 *raster;
	258
	259	TIFFGetField( tif, TIFFTAG_IMAGEWIDTH, &w );
	260	TIFFGetField( tif, TIFFTAG_IMAGELENGTH, &h );
	261
	262	npixels = w * h;
	263
	264	raster = (uint32) _TIFFmalloc( npixels sizeof(uint32) );
	265
	266	if (!raster)
	267	{
	268	if (verbose)
	269	wxLogError( _("TIFF: Couldn't allocate memory.") );
	270
	271	TIFFClose( tif );
	272
	273	return false;
	274	}
	275
	276	image->Create( (int)w, (int)h );
	277	if (!image->Ok())
	278	{
	279	if (verbose)
	280	wxLogError( _("TIFF: Couldn't allocate memory.") );
	281
	282	_TIFFfree( raster );
	283	TIFFClose( tif );
	284
	285	return false;
	286	}
	287
	288	if (!TIFFReadRGBAImage( tif, w, h, raster, 0 ))
	289	{
	290	if (verbose)
	291	wxLogError( _("TIFF: Error reading image.") );
	292
	293	_TIFFfree( raster );
	294	image->Destroy();
	295	TIFFClose( tif );
	296
	297	return false;
	298	}
	299
	300	bool hasmask = false;
	301
	302	unsigned char *ptr = image->GetData();
	303	ptr += w3(h-1);
	304	uint32 pos = 0;
	305
	306	for (uint32 i = 0; i < h; i++)
	307	{
	308	for (uint32 j = 0; j < w; j++)
	309	{
	310	unsigned char alpha = (unsigned char)TIFFGetA(raster[pos]);
	311	if (alpha < 127)
	312	{
	313	hasmask = true;
	314	ptr[0] = image->GetMaskRed();
	315	ptr++;
	316	ptr[0] = image->GetMaskGreen();
	317	ptr++;
	318	ptr[0] = image->GetMaskBlue();
	319	ptr++;
	320	}
	321	else
	322	{
	323	ptr[0] = (unsigned char)TIFFGetR(raster[pos]);
	324	ptr++;
	325	ptr[0] = (unsigned char)TIFFGetG(raster[pos]);
	326	ptr++;
	327	ptr[0] = (unsigned char)TIFFGetB(raster[pos]);
	328	ptr++;
	329	}
	330	pos++;
	331	}
	332	ptr -= 2w3; // subtract line we just added plus one line
	333	}
	334
	335	_TIFFfree( raster );
	336
	337	TIFFClose( tif );
	338
	339	image->SetMask( hasmask );
	340
	341	return true;
	342	}
	343
	344	int wxTIFFHandler::GetImageCount( wxInputStream& stream )
	345	{
	346	TIFF *tif = TIFFwxOpen( stream, "image", "r" );
	347
	348	if (!tif)
	349	return 0;
	350
	351	int dircount = 0; // according to the libtiff docs, dircount should be set to 1 here???
	352	do {
	353	dircount++;
	354	} while (TIFFReadDirectory(tif));
	355
	356	TIFFClose( tif );
	357
	358	return dircount;
	359	}
	360
	361	bool wxTIFFHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbose )
	362	{
	363	TIFF *tif = TIFFwxOpen( stream, "image", "w" );
	364
	365	if (!tif)
	366	{
	367	if (verbose)
	368	wxLogError( _("TIFF: Error saving image.") );
	369
	370	return false;
	371	}
	372
	373	TIFFSetField(tif, TIFFTAG_ORIENTATION, ORIENTATION_TOPLEFT);
	374	TIFFSetField(tif, TIFFTAG_IMAGEWIDTH, (uint32)image->GetWidth());
	375	TIFFSetField(tif, TIFFTAG_IMAGELENGTH, (uint32)image->GetHeight());
	376	TIFFSetField(tif, TIFFTAG_ORIENTATION, ORIENTATION_TOPLEFT);
	377	TIFFSetField(tif, TIFFTAG_PLANARCONFIG, PLANARCONFIG_CONTIG);
	378
	379	if ( image->HasOption(wxIMAGE_OPTION_RESOLUTIONX) &&
	380	image->HasOption(wxIMAGE_OPTION_RESOLUTIONY) )
	381	{
	382	TIFFSetField(tif, TIFFTAG_XRESOLUTION,
	383	(float)image->GetOptionInt(wxIMAGE_OPTION_RESOLUTIONX));
	384	TIFFSetField(tif, TIFFTAG_YRESOLUTION,
	385	(float)image->GetOptionInt(wxIMAGE_OPTION_RESOLUTIONY));
	386	}
	387
	388	int spp = image->GetOptionInt(wxIMAGE_OPTION_SAMPLESPERPIXEL);
	389	if ( !spp )
	390	spp = 3;
	391
	392	int bpp = image->GetOptionInt(wxIMAGE_OPTION_BITSPERSAMPLE);
	393	if ( !bpp )
	394	bpp=8;
	395
	396	int compression = image->GetOptionInt(wxIMAGE_OPTION_COMPRESSION);
	397	if ( !compression )
	398	{
	399	// we can't use COMPRESSION_LZW because current version of libtiff
	400	// doesn't implement it ("no longer implemented due to Unisys patent
	401	// enforcement") and other compression methods are lossy so we
	402	// shouldn't use them by default -- and the only remaining one is none
	403	compression = COMPRESSION_NONE;
	404	}
	405
	406	TIFFSetField(tif, TIFFTAG_SAMPLESPERPIXEL, spp);
	407	TIFFSetField(tif, TIFFTAG_BITSPERSAMPLE, bpp);
	408	TIFFSetField(tif, TIFFTAG_PHOTOMETRIC, spp*bpp == 1 ? PHOTOMETRIC_MINISBLACK
	409	: PHOTOMETRIC_RGB);
	410	TIFFSetField(tif, TIFFTAG_COMPRESSION, compression);
	411
	412	// scanlinesize if determined by spp and bpp
	413	tsize_t linebytes = (tsize_t)image->GetWidth() * spp * bpp / 8;
	414
	415	if ( (image->GetWidth() % 8 > 0) && (spp * bpp < 8) )
	416	linebytes+=1;
	417
	418	unsigned char *buf;
	419
	420	if (TIFFScanlineSize(tif) > linebytes \|\| (spp * bpp < 24))
	421	{
	422	buf = (unsigned char *)_TIFFmalloc(TIFFScanlineSize(tif));
	423	if (!buf)
	424	{
	425	if (verbose)
	426	wxLogError( _("TIFF: Couldn't allocate memory.") );
	427
	428	TIFFClose( tif );
	429
	430	return false;
	431	}
	432	}
	433	else
	434	{
	435	buf = NULL;
	436	}
	437
	438	TIFFSetField(tif, TIFFTAG_ROWSPERSTRIP,TIFFDefaultStripSize(tif, (uint32) -1));
	439
	440	unsigned char *ptr = image->GetData();
	441	for ( int row = 0; row < image->GetHeight(); row++ )
	442	{
	443	if ( buf )
	444	{
	445	if ( spp * bpp > 1 )
	446	{
	447	// color image
	448	memcpy(buf, ptr, image->GetWidth());
	449	}
	450	else // black and white image
	451	{
	452	for ( int column = 0; column < linebytes; column++ )
	453	{
	454	uint8 reverse = 0;
	455	for ( int bp = 0; bp < 8; bp++ )
	456	{
	457	if ( ptr[column24 + bp3] > 0 )
	458	{
	459	// check only red as this is sufficient
	460	reverse = (uint8)(reverse \| 128 >> bp);
	461	}
	462	}
	463
	464	buf[column] = reverse;
	465	}
	466	}
	467	}
	468
	469	if ( TIFFWriteScanline(tif, buf ? buf : ptr, (uint32)row, 0) < 0 )
	470	{
	471	if (verbose)
	472	wxLogError( _("TIFF: Error writing image.") );
	473
	474	TIFFClose( tif );
	475	if (buf)
	476	_TIFFfree(buf);
	477
	478	return false;
	479	}
	480
	481	ptr += image->GetWidth()*3;
	482	}
	483
	484	(void) TIFFClose(tif);
	485
	486	if (buf)
	487	_TIFFfree(buf);
	488
	489	return true;
	490	}
	491
	492	bool wxTIFFHandler::DoCanRead( wxInputStream& stream )
	493	{
	494	unsigned char hdr[2];
	495
	496	if ( !stream.Read(&hdr[0], WXSIZEOF(hdr)) )
	497	return false;
	498
	499	return (hdr[0] == 'I' && hdr[1] == 'I') \|\|
	500	(hdr[0] == 'M' && hdr[1] == 'M');
	501	}
	502
	503	#endif // wxUSE_STREAMS
	504
	505	#endif // wxUSE_LIBTIFF