src/common/imagtiff.cpp

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

#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
#pragma implementation "imagtiff.h"
#endif

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

#ifdef __BORLANDC__
#pragma hdrstop
#endif

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

#ifndef TIFFLINKAGEMODE
  #define TIFFLINKAGEMODE LINKAGEMODE
#endif

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

IMPLEMENT_DYNAMIC_CLASS(wxTIFFHandler,wxImageHandler)

#if wxUSE_STREAMS

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 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 stream->LastWrite();
}

toff_t TIFFLINKAGEMODE
_tiffSeekIProc(thandle_t handle, toff_t off, int whence)
{
    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 );
}

toff_t TIFFLINKAGEMODE
_tiffSeekOProc(thandle_t handle, toff_t off, int whence)
{
    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( (off_t)off, mode );
}

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* fmt, va_list ap)
{
    if (module != NULL)
            wxLogWarning(_("tiff module: %s"), module);
    wxLogWarning((wxChar *) fmt, ap);
}

static void
TIFFwxErrorHandler(const char* module, const char* fmt, va_list ap)
{
    if (module != NULL)
            wxLogError(_("tiff module: %s"), module);
    wxVLogError((wxChar *) fmt, ap);
}

} // 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_IMAGEWIDTH,  (uint32)image->GetWidth());
    TIFFSetField(tif, TIFFTAG_IMAGELENGTH, (uint32)image->GetHeight());
    TIFFSetField(tif, TIFFTAG_ORIENTATION, ORIENTATION_TOPLEFT);
    TIFFSetField(tif, TIFFTAG_SAMPLESPERPIXEL, 3);
    TIFFSetField(tif, TIFFTAG_BITSPERSAMPLE, 8);
    TIFFSetField(tif, TIFFTAG_PLANARCONFIG, PLANARCONFIG_CONTIG);
    TIFFSetField(tif, TIFFTAG_PHOTOMETRIC, PHOTOMETRIC_RGB);
    TIFFSetField(tif, TIFFTAG_COMPRESSION, COMPRESSION_LZW);

    tsize_t linebytes = (tsize_t)image->GetWidth() * 3;
    unsigned char *buf;

    if (TIFFScanlineSize(tif) > linebytes)
    {
        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)
            memcpy(buf, ptr, image->GetWidth());

        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, 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: 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	#if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
	11	#pragma implementation "imagtiff.h"
	12	#endif
	13
	14	// For compilers that support precompilation, includes "wx.h".
	15	#include "wx/wxprec.h"
	16
	17	#ifdef __BORLANDC__
	18	#pragma hdrstop
	19	#endif
	20
	21	#include "wx/defs.h"
	22
	23	#if wxUSE_IMAGE && wxUSE_LIBTIFF
	24
	25	#include "wx/imagtiff.h"
	26	#include "wx/bitmap.h"
	27	#include "wx/debug.h"
	28	#include "wx/log.h"
	29	#include "wx/app.h"
	30	extern "C"
	31	{
	32	#include "tiff.h"
	33	#include "tiffio.h"
	34	}
	35	#include "wx/filefn.h"
	36	#include "wx/wfstream.h"
	37	#include "wx/intl.h"
	38	#include "wx/module.h"
	39
	40	#ifndef TIFFLINKAGEMODE
	41	#define TIFFLINKAGEMODE LINKAGEMODE
	42	#endif
	43
	44	//-----------------------------------------------------------------------------
	45	// wxTIFFHandler
	46	//-----------------------------------------------------------------------------
	47
	48	IMPLEMENT_DYNAMIC_CLASS(wxTIFFHandler,wxImageHandler)
	49
	50	#if wxUSE_STREAMS
	51
	52	extern "C"
	53	{
	54
	55	tsize_t TIFFLINKAGEMODE
	56	_tiffNullProc(thandle_t WXUNUSED(handle),
	57	tdata_t WXUNUSED(buf),
	58	tsize_t WXUNUSED(size))
	59	{
	60	return (tsize_t) -1;
	61	}
	62
	63	tsize_t TIFFLINKAGEMODE
	64	_tiffReadProc(thandle_t handle, tdata_t buf, tsize_t size)
	65	{
	66	wxInputStream stream = (wxInputStream) handle;
	67	stream->Read( (void*) buf, (size_t) size );
	68	return stream->LastRead();
	69	}
	70
	71	tsize_t TIFFLINKAGEMODE
	72	_tiffWriteProc(thandle_t handle, tdata_t buf, tsize_t size)
	73	{
	74	wxOutputStream stream = (wxOutputStream) handle;
	75	stream->Write( (void*) buf, (size_t) size );
	76	return stream->LastWrite();
	77	}
	78
	79	toff_t TIFFLINKAGEMODE
	80	_tiffSeekIProc(thandle_t handle, toff_t off, int whence)
	81	{
	82	wxInputStream stream = (wxInputStream) handle;
	83	wxSeekMode mode;
	84	switch (whence)
	85	{
	86	case SEEK_SET: mode = wxFromStart; break;
	87	case SEEK_CUR: mode = wxFromCurrent; break;
	88	case SEEK_END: mode = wxFromEnd; break;
	89	default: mode = wxFromCurrent; break;
	90	}
	91
	92	return (toff_t)stream->SeekI( (off_t)off, mode );
	93	}
	94
	95	toff_t TIFFLINKAGEMODE
	96	_tiffSeekOProc(thandle_t handle, toff_t off, int whence)
	97	{
	98	wxOutputStream stream = (wxOutputStream) handle;
	99	wxSeekMode mode;
	100	switch (whence)
	101	{
	102	case SEEK_SET: mode = wxFromStart; break;
	103	case SEEK_CUR: mode = wxFromCurrent; break;
	104	case SEEK_END: mode = wxFromEnd; break;
	105	default: mode = wxFromCurrent; break;
	106	}
	107
	108	return (toff_t)stream->SeekO( (off_t)off, mode );
	109	}
	110
	111	int TIFFLINKAGEMODE
	112	_tiffCloseProc(thandle_t WXUNUSED(handle))
	113	{
	114	return 0; // ?
	115	}
	116
	117	toff_t TIFFLINKAGEMODE
	118	_tiffSizeProc(thandle_t handle)
	119	{
	120	wxStreamBase stream = (wxStreamBase) handle;
	121	return (toff_t) stream->GetSize();
	122	}
	123
	124	int TIFFLINKAGEMODE
	125	_tiffMapProc(thandle_t WXUNUSED(handle),
	126	tdata_t* WXUNUSED(pbase),
	127	toff_t* WXUNUSED(psize))
	128	{
	129	return 0;
	130	}
	131
	132	void TIFFLINKAGEMODE
	133	_tiffUnmapProc(thandle_t WXUNUSED(handle),
	134	tdata_t WXUNUSED(base),
	135	toff_t WXUNUSED(size))
	136	{
	137	}
	138
	139	static void
	140	TIFFwxWarningHandler(const char* module, const char* fmt, va_list ap)
	141	{
	142	if (module != NULL)
	143	wxLogWarning(_("tiff module: %s"), module);
	144	wxLogWarning((wxChar *) fmt, ap);
	145	}
	146
	147	static void
	148	TIFFwxErrorHandler(const char* module, const char* fmt, va_list ap)
	149	{
	150	if (module != NULL)
	151	wxLogError(_("tiff module: %s"), module);
	152	wxVLogError((wxChar *) fmt, ap);
	153	}
	154
	155	} // extern "C"
	156
	157	TIFF*
	158	TIFFwxOpen(wxInputStream &stream, const char* name, const char* mode)
	159	{
	160	TIFF* tif = TIFFClientOpen(name, mode,
	161	(thandle_t) &stream,
	162	_tiffReadProc, _tiffNullProc,
	163	_tiffSeekIProc, _tiffCloseProc, _tiffSizeProc,
	164	_tiffMapProc, _tiffUnmapProc);
	165
	166	return tif;
	167	}
	168
	169	TIFF*
	170	TIFFwxOpen(wxOutputStream &stream, const char* name, const char* mode)
	171	{
	172	TIFF* tif = TIFFClientOpen(name, mode,
	173	(thandle_t) &stream,
	174	_tiffNullProc, _tiffWriteProc,
	175	_tiffSeekOProc, _tiffCloseProc, _tiffSizeProc,
	176	_tiffMapProc, _tiffUnmapProc);
	177
	178	return tif;
	179	}
	180
	181	wxTIFFHandler::wxTIFFHandler()
	182	{
	183	m_name = wxT("TIFF file");
	184	m_extension = wxT("tif");
	185	m_type = wxBITMAP_TYPE_TIF;
	186	m_mime = wxT("image/tiff");
	187	TIFFSetWarningHandler((TIFFErrorHandler) TIFFwxWarningHandler);
	188	TIFFSetErrorHandler((TIFFErrorHandler) TIFFwxErrorHandler);
	189	}
	190
	191	bool wxTIFFHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbose, int index )
	192	{
	193	if (index == -1)
	194	index = 0;
	195
	196	image->Destroy();
	197
	198	TIFF *tif = TIFFwxOpen( stream, "image", "r" );
	199
	200	if (!tif)
	201	{
	202	if (verbose)
	203	wxLogError( _("TIFF: Error loading image.") );
	204
	205	return false;
	206	}
	207
	208	if (!TIFFSetDirectory( tif, (tdir_t)index ))
	209	{
	210	if (verbose)
	211	wxLogError( _("Invalid TIFF image index.") );
	212
	213	TIFFClose( tif );
	214
	215	return false;
	216	}
	217
	218	uint32 w, h;
	219	uint32 npixels;
	220	uint32 *raster;
	221
	222	TIFFGetField( tif, TIFFTAG_IMAGEWIDTH, &w );
	223	TIFFGetField( tif, TIFFTAG_IMAGELENGTH, &h );
	224
	225	npixels = w * h;
	226
	227	raster = (uint32) _TIFFmalloc( npixels sizeof(uint32) );
	228
	229	if (!raster)
	230	{
	231	if (verbose)
	232	wxLogError( _("TIFF: Couldn't allocate memory.") );
	233
	234	TIFFClose( tif );
	235
	236	return false;
	237	}
	238
	239	image->Create( (int)w, (int)h );
	240	if (!image->Ok())
	241	{
	242	if (verbose)
	243	wxLogError( _("TIFF: Couldn't allocate memory.") );
	244
	245	_TIFFfree( raster );
	246	TIFFClose( tif );
	247
	248	return false;
	249	}
	250
	251	if (!TIFFReadRGBAImage( tif, w, h, raster, 0 ))
	252	{
	253	if (verbose)
	254	wxLogError( _("TIFF: Error reading image.") );
	255
	256	_TIFFfree( raster );
	257	image->Destroy();
	258	TIFFClose( tif );
	259
	260	return false;
	261	}
	262
	263	bool hasmask = false;
	264
	265	unsigned char *ptr = image->GetData();
	266	ptr += w3(h-1);
	267	uint32 pos = 0;
	268
	269	for (uint32 i = 0; i < h; i++)
	270	{
	271	for (uint32 j = 0; j < w; j++)
	272	{
	273	unsigned char alpha = (unsigned char)TIFFGetA(raster[pos]);
	274	if (alpha < 127)
	275	{
	276	hasmask = true;
	277	ptr[0] = image->GetMaskRed();
	278	ptr++;
	279	ptr[0] = image->GetMaskGreen();
	280	ptr++;
	281	ptr[0] = image->GetMaskBlue();
	282	ptr++;
	283	}
	284	else
	285	{
	286	ptr[0] = (unsigned char)TIFFGetR(raster[pos]);
	287	ptr++;
	288	ptr[0] = (unsigned char)TIFFGetG(raster[pos]);
	289	ptr++;
	290	ptr[0] = (unsigned char)TIFFGetB(raster[pos]);
	291	ptr++;
	292	}
	293	pos++;
	294	}
	295	ptr -= 2w3; // subtract line we just added plus one line
	296	}
	297
	298	_TIFFfree( raster );
	299
	300	TIFFClose( tif );
	301
	302	image->SetMask( hasmask );
	303
	304	return true;
	305	}
	306
	307	int wxTIFFHandler::GetImageCount( wxInputStream& stream )
	308	{
	309	TIFF *tif = TIFFwxOpen( stream, "image", "r" );
	310
	311	if (!tif)
	312	return 0;
	313
	314	int dircount = 0; // according to the libtiff docs, dircount should be set to 1 here???
	315	do {
	316	dircount++;
	317	} while (TIFFReadDirectory(tif));
	318
	319	TIFFClose( tif );
	320
	321	return dircount;
	322	}
	323
	324	bool wxTIFFHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbose )
	325	{
	326	TIFF *tif = TIFFwxOpen( stream, "image", "w" );
	327
	328	if (!tif)
	329	{
	330	if (verbose)
	331	wxLogError( _("TIFF: Error saving image.") );
	332
	333	return false;
	334	}
	335
	336	TIFFSetField(tif, TIFFTAG_IMAGEWIDTH, (uint32)image->GetWidth());
	337	TIFFSetField(tif, TIFFTAG_IMAGELENGTH, (uint32)image->GetHeight());
	338	TIFFSetField(tif, TIFFTAG_ORIENTATION, ORIENTATION_TOPLEFT);
	339	TIFFSetField(tif, TIFFTAG_SAMPLESPERPIXEL, 3);
	340	TIFFSetField(tif, TIFFTAG_BITSPERSAMPLE, 8);
	341	TIFFSetField(tif, TIFFTAG_PLANARCONFIG, PLANARCONFIG_CONTIG);
	342	TIFFSetField(tif, TIFFTAG_PHOTOMETRIC, PHOTOMETRIC_RGB);
	343	TIFFSetField(tif, TIFFTAG_COMPRESSION, COMPRESSION_LZW);
	344
	345	tsize_t linebytes = (tsize_t)image->GetWidth() * 3;
	346	unsigned char *buf;
	347
	348	if (TIFFScanlineSize(tif) > linebytes)
	349	{
	350	buf = (unsigned char *)_TIFFmalloc(TIFFScanlineSize(tif));
	351	if (!buf)
	352	{
	353	if (verbose)
	354	wxLogError( _("TIFF: Couldn't allocate memory.") );
	355
	356	TIFFClose( tif );
	357
	358	return false;
	359	}
	360	}
	361	else
	362	{
	363	buf = NULL;
	364	}
	365
	366	TIFFSetField(tif, TIFFTAG_ROWSPERSTRIP,
	367	TIFFDefaultStripSize(tif, (uint32) -1));
	368
	369	unsigned char *ptr = image->GetData();
	370	for (int row = 0; row < image->GetHeight(); row++)
	371	{
	372	if (buf)
	373	memcpy(buf, ptr, image->GetWidth());
	374
	375	if (TIFFWriteScanline(tif, buf ? buf : ptr, (uint32)row, 0) < 0)
	376	{
	377	if (verbose)
	378	wxLogError( _("TIFF: Error writing image.") );
	379
	380	TIFFClose( tif );
	381	if (buf)
	382	_TIFFfree(buf);
	383
	384	return false;
	385	}
	386	ptr += image->GetWidth()*3;
	387	}
	388
	389	(void) TIFFClose(tif);
	390
	391	if (buf)
	392	_TIFFfree(buf);
	393
	394	return true;
	395	}
	396
	397	bool wxTIFFHandler::DoCanRead( wxInputStream& stream )
	398	{
	399	unsigned char hdr[2];
	400
	401	if ( !stream.Read(&hdr, WXSIZEOF(hdr)) )
	402	return false;
	403
	404	return (hdr[0] == 'I' && hdr[1] == 'I') \|\|
	405	(hdr[0] == 'M' && hdr[1] == 'M');
	406	}
	407
	408	#endif // wxUSE_STREAMS
	409
	410	#endif // wxUSE_LIBTIFF
	411