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"
    #include "wx/bitmap.h"
#endif

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