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
/////////////////////////////////////////////////////////////////////////////

// ============================================================================
// declarations
// ============================================================================

// ----------------------------------------------------------------------------
// headers
// ----------------------------------------------------------------------------

// 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"
    #include "wx/module.h"
    #include "wx/wxcrtvararg.h"
#endif

extern "C"
{
#ifdef __DMC__
    #include "tif_config.h"
#endif
    #include "tiff.h"
    #include "tiffio.h"
}
#include "wx/filefn.h"
#include "wx/wfstream.h"

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

// ============================================================================
// implementation
// ============================================================================

// ----------------------------------------------------------------------------
// TIFF library error/warning handlers
// ----------------------------------------------------------------------------

static wxString
FormatTiffMessage(const char *module, const char *fmt, va_list ap)
{
    char buf[512];
    if ( wxCRT_VsnprintfA(buf, WXSIZEOF(buf), fmt, ap) <= 0 )
    {
        // this isn't supposed to happen, but if it does, it's better
        // than nothing
        strcpy(buf, "Incorrectly formatted TIFF message");
    }
    buf[WXSIZEOF(buf)-1] = 0; // make sure it is always NULL-terminated

    wxString msg(buf);
    if ( module )
        msg += wxString::Format(_(" (in module \"%s\")"), module);

    return msg;
}

extern "C"
{

static void
TIFFwxWarningHandler(const char* module, const char *fmt, va_list ap)
{
    wxLogWarning("%s", FormatTiffMessage(module, fmt, ap));
}

static void
TIFFwxErrorHandler(const char* module, const char *fmt, va_list ap)
{
    wxLogError("%s", FormatTiffMessage(module, fmt, ap));
}

} // extern "C"

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

IMPLEMENT_DYNAMIC_CLASS(wxTIFFHandler,wxImageHandler)

wxTIFFHandler::wxTIFFHandler()
{
    m_name = wxT("TIFF file");
    m_extension = wxT("tif");
    m_altExtensions.Add(wxT("tiff"));
    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 );
    return wx_truncate_cast(tsize_t, stream->LastRead());
}

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

    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)));
}

int TIFFLINKAGEMODE
wxTIFFCloseIProc(thandle_t WXUNUSED(handle))
{
    // there is no need to close the input stream
    return 0;
}

int TIFFLINKAGEMODE
wxTIFFCloseOProc(thandle_t 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();
}

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

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,
        wxTIFFReadProc, wxTIFFNullProc,
        wxTIFFSeekIProc, wxTIFFCloseIProc, wxTIFFSizeProc,
        wxTIFFMapProc, wxTIFFUnmapProc);

    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, 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 *raster;

    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));

    // guard against integer overflow during multiplication which could result
    // in allocating a too small buffer and then overflowing it
    const double bytesNeeded = (double)w * (double)h * sizeof(uint32);
    if ( bytesNeeded >= wxUINT32_MAX )
    {
        if ( verbose )
            wxLogError( _("TIFF: Image size is abnormally big.") );

        TIFFClose(tif);

        return false;
    }

    raster = (uint32*) _TIFFmalloc( bytesNeeded );

    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 ( hasAlpha )
        image->SetAlpha();

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

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

        return false;
    }

    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++)
        {
            *(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 );

    TIFFClose( tif );

    return true;
}

int wxTIFFHandler::DoGetImageCount( 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 );

    // NOTE: this function modifies the current stream position but it's ok
    //       (see wxImageHandler::GetImageCount)

    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);

    // 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)) )     // it's ok to modify the stream position here
        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	// ============================================================================
	11	// declarations
	12	// ============================================================================
	13
	14	// ----------------------------------------------------------------------------
	15	// headers
	16	// ----------------------------------------------------------------------------
	17
	18	// For compilers that support precompilation, includes "wx.h".
	19	#include "wx/wxprec.h"
	20
	21	#ifdef __BORLANDC__
	22	#pragma hdrstop
	23	#endif
	24
	25	#if wxUSE_IMAGE && wxUSE_LIBTIFF
	26
	27	#include "wx/imagtiff.h"
	28
	29	#ifndef WX_PRECOMP
	30	#include "wx/log.h"
	31	#include "wx/app.h"
	32	#include "wx/intl.h"
	33	#include "wx/bitmap.h"
	34	#include "wx/module.h"
	35	#include "wx/wxcrtvararg.h"
	36	#endif
	37
	38	extern "C"
	39	{
	40	#ifdef __DMC__
	41	#include "tif_config.h"
	42	#endif
	43	#include "tiff.h"
	44	#include "tiffio.h"
	45	}
	46	#include "wx/filefn.h"
	47	#include "wx/wfstream.h"
	48
	49	#ifndef TIFFLINKAGEMODE
	50	#if defined(__WATCOMC__) && defined(__WXMGL__)
	51	#define TIFFLINKAGEMODE cdecl
	52	#else
	53	#define TIFFLINKAGEMODE LINKAGEMODE
	54	#endif
	55	#endif
	56
	57	// ============================================================================
	58	// implementation
	59	// ============================================================================
	60
	61	// ----------------------------------------------------------------------------
	62	// TIFF library error/warning handlers
	63	// ----------------------------------------------------------------------------
	64
	65	static wxString
	66	FormatTiffMessage(const char module, const char fmt, va_list ap)
	67	{
	68	char buf[512];
	69	if ( wxCRT_VsnprintfA(buf, WXSIZEOF(buf), fmt, ap) <= 0 )
	70	{
	71	// this isn't supposed to happen, but if it does, it's better
	72	// than nothing
	73	strcpy(buf, "Incorrectly formatted TIFF message");
	74	}
	75	buf[WXSIZEOF(buf)-1] = 0; // make sure it is always NULL-terminated
	76
	77	wxString msg(buf);
	78	if ( module )
	79	msg += wxString::Format(_(" (in module \"%s\")"), module);
	80
	81	return msg;
	82	}
	83
	84	extern "C"
	85	{
	86
	87	static void
	88	TIFFwxWarningHandler(const char* module, const char *fmt, va_list ap)
	89	{
	90	wxLogWarning("%s", FormatTiffMessage(module, fmt, ap));
	91	}
	92
	93	static void
	94	TIFFwxErrorHandler(const char* module, const char *fmt, va_list ap)
	95	{
	96	wxLogError("%s", FormatTiffMessage(module, fmt, ap));
	97	}
	98
	99	} // extern "C"
	100
	101	//-----------------------------------------------------------------------------
	102	// wxTIFFHandler
	103	//-----------------------------------------------------------------------------
	104
	105	IMPLEMENT_DYNAMIC_CLASS(wxTIFFHandler,wxImageHandler)
	106
	107	wxTIFFHandler::wxTIFFHandler()
	108	{
	109	m_name = wxT("TIFF file");
	110	m_extension = wxT("tif");
	111	m_altExtensions.Add(wxT("tiff"));
	112	m_type = wxBITMAP_TYPE_TIF;
	113	m_mime = wxT("image/tiff");
	114	TIFFSetWarningHandler((TIFFErrorHandler) TIFFwxWarningHandler);
	115	TIFFSetErrorHandler((TIFFErrorHandler) TIFFwxErrorHandler);
	116	}
	117
	118	#if wxUSE_STREAMS
	119
	120	// helper to translate our, possibly 64 bit, wxFileOffset to TIFF, always 32
	121	// bit, toff_t
	122	static toff_t wxFileOffsetToTIFF(wxFileOffset ofs)
	123	{
	124	if ( ofs == wxInvalidOffset )
	125	return (toff_t)-1;
	126
	127	toff_t tofs = wx_truncate_cast(toff_t, ofs);
	128	wxCHECK_MSG( (wxFileOffset)tofs == ofs, (toff_t)-1,
	129	_T("TIFF library doesn't support large files") );
	130
	131	return tofs;
	132	}
	133
	134	// another helper to convert standard seek mode to our
	135	static wxSeekMode wxSeekModeFromTIFF(int whence)
	136	{
	137	switch ( whence )
	138	{
	139	case SEEK_SET:
	140	return wxFromStart;
	141
	142	case SEEK_CUR:
	143	return wxFromCurrent;
	144
	145	case SEEK_END:
	146	return wxFromEnd;
	147
	148	default:
	149	return wxFromCurrent;
	150	}
	151	}
	152
	153	extern "C"
	154	{
	155
	156	tsize_t TIFFLINKAGEMODE
	157	wxTIFFNullProc(thandle_t WXUNUSED(handle),
	158	tdata_t WXUNUSED(buf),
	159	tsize_t WXUNUSED(size))
	160	{
	161	return (tsize_t) -1;
	162	}
	163
	164	tsize_t TIFFLINKAGEMODE
	165	wxTIFFReadProc(thandle_t handle, tdata_t buf, tsize_t size)
	166	{
	167	wxInputStream stream = (wxInputStream) handle;
	168	stream->Read( (void*) buf, (size_t) size );
	169	return wx_truncate_cast(tsize_t, stream->LastRead());
	170	}
	171
	172	tsize_t TIFFLINKAGEMODE
	173	wxTIFFWriteProc(thandle_t handle, tdata_t buf, tsize_t size)
	174	{
	175	wxOutputStream stream = (wxOutputStream) handle;
	176	stream->Write( (void*) buf, (size_t) size );
	177	return wx_truncate_cast(tsize_t, stream->LastWrite());
	178	}
	179
	180	toff_t TIFFLINKAGEMODE
	181	wxTIFFSeekIProc(thandle_t handle, toff_t off, int whence)
	182	{
	183	wxInputStream stream = (wxInputStream) handle;
	184
	185	return wxFileOffsetToTIFF(stream->SeekI((wxFileOffset)off,
	186	wxSeekModeFromTIFF(whence)));
	187	}
	188
	189	toff_t TIFFLINKAGEMODE
	190	wxTIFFSeekOProc(thandle_t handle, toff_t off, int whence)
	191	{
	192	wxOutputStream stream = (wxOutputStream) handle;
	193
	194	return wxFileOffsetToTIFF(stream->SeekO((wxFileOffset)off,
	195	wxSeekModeFromTIFF(whence)));
	196	}
	197
	198	int TIFFLINKAGEMODE
	199	wxTIFFCloseIProc(thandle_t WXUNUSED(handle))
	200	{
	201	// there is no need to close the input stream
	202	return 0;
	203	}
	204
	205	int TIFFLINKAGEMODE
	206	wxTIFFCloseOProc(thandle_t handle)
	207	{
	208	wxOutputStream stream = (wxOutputStream) handle;
	209
	210	return stream->Close() ? 0 : -1;
	211	}
	212
	213	toff_t TIFFLINKAGEMODE
	214	wxTIFFSizeProc(thandle_t handle)
	215	{
	216	wxStreamBase stream = (wxStreamBase) handle;
	217	return (toff_t) stream->GetSize();
	218	}
	219
	220	int TIFFLINKAGEMODE
	221	wxTIFFMapProc(thandle_t WXUNUSED(handle),
	222	tdata_t* WXUNUSED(pbase),
	223	toff_t* WXUNUSED(psize))
	224	{
	225	return 0;
	226	}
	227
	228	void TIFFLINKAGEMODE
	229	wxTIFFUnmapProc(thandle_t WXUNUSED(handle),
	230	tdata_t WXUNUSED(base),
	231	toff_t WXUNUSED(size))
	232	{
	233	}
	234
	235	} // extern "C"
	236
	237	TIFF*
	238	TIFFwxOpen(wxInputStream &stream, const char* name, const char* mode)
	239	{
	240	TIFF* tif = TIFFClientOpen(name, mode,
	241	(thandle_t) &stream,
	242	wxTIFFReadProc, wxTIFFNullProc,
	243	wxTIFFSeekIProc, wxTIFFCloseIProc, wxTIFFSizeProc,
	244	wxTIFFMapProc, wxTIFFUnmapProc);
	245
	246	return tif;
	247	}
	248
	249	TIFF*
	250	TIFFwxOpen(wxOutputStream &stream, const char* name, const char* mode)
	251	{
	252	TIFF* tif = TIFFClientOpen(name, mode,
	253	(thandle_t) &stream,
	254	wxTIFFNullProc, wxTIFFWriteProc,
	255	wxTIFFSeekOProc, wxTIFFCloseOProc, wxTIFFSizeProc,
	256	wxTIFFMapProc, wxTIFFUnmapProc);
	257
	258	return tif;
	259	}
	260
	261	bool wxTIFFHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbose, int index )
	262	{
	263	if (index == -1)
	264	index = 0;
	265
	266	image->Destroy();
	267
	268	TIFF *tif = TIFFwxOpen( stream, "image", "r" );
	269
	270	if (!tif)
	271	{
	272	if (verbose)
	273	wxLogError( _("TIFF: Error loading image.") );
	274
	275	return false;
	276	}
	277
	278	if (!TIFFSetDirectory( tif, (tdir_t)index ))
	279	{
	280	if (verbose)
	281	wxLogError( _("Invalid TIFF image index.") );
	282
	283	TIFFClose( tif );
	284
	285	return false;
	286	}
	287
	288	uint32 w, h;
	289	uint32 *raster;
	290
	291	TIFFGetField( tif, TIFFTAG_IMAGEWIDTH, &w );
	292	TIFFGetField( tif, TIFFTAG_IMAGELENGTH, &h );
	293
	294	uint16 extraSamples;
	295	uint16* samplesInfo;
	296	TIFFGetFieldDefaulted(tif, TIFFTAG_EXTRASAMPLES,
	297	&extraSamples, &samplesInfo);
	298	const bool hasAlpha = (extraSamples == 1 &&
	299	(samplesInfo[0] == EXTRASAMPLE_ASSOCALPHA \|\|
	300	samplesInfo[0] == EXTRASAMPLE_UNASSALPHA));
	301
	302	// guard against integer overflow during multiplication which could result
	303	// in allocating a too small buffer and then overflowing it
	304	const double bytesNeeded = (double)w * (double)h * sizeof(uint32);
	305	if ( bytesNeeded >= wxUINT32_MAX )
	306	{
	307	if ( verbose )
	308	wxLogError( _("TIFF: Image size is abnormally big.") );
	309
	310	TIFFClose(tif);
	311
	312	return false;
	313	}
	314
	315	raster = (uint32*) _TIFFmalloc( bytesNeeded );
	316
	317	if (!raster)
	318	{
	319	if (verbose)
	320	wxLogError( _("TIFF: Couldn't allocate memory.") );
	321
	322	TIFFClose( tif );
	323
	324	return false;
	325	}
	326
	327	image->Create( (int)w, (int)h );
	328	if (!image->Ok())
	329	{
	330	if (verbose)
	331	wxLogError( _("TIFF: Couldn't allocate memory.") );
	332
	333	_TIFFfree( raster );
	334	TIFFClose( tif );
	335
	336	return false;
	337	}
	338
	339	if ( hasAlpha )
	340	image->SetAlpha();
	341
	342	if (!TIFFReadRGBAImage( tif, w, h, raster, 0 ))
	343	{
	344	if (verbose)
	345	wxLogError( _("TIFF: Error reading image.") );
	346
	347	_TIFFfree( raster );
	348	image->Destroy();
	349	TIFFClose( tif );
	350
	351	return false;
	352	}
	353
	354	unsigned char *ptr = image->GetData();
	355	ptr += w3(h-1);
	356
	357	unsigned char *alpha = hasAlpha ? image->GetAlpha() : NULL;
	358	if ( hasAlpha )
	359	alpha += w*(h-1);
	360
	361	uint32 pos = 0;
	362
	363	for (uint32 i = 0; i < h; i++)
	364	{
	365	for (uint32 j = 0; j < w; j++)
	366	{
	367	*(ptr++) = (unsigned char)TIFFGetR(raster[pos]);
	368	*(ptr++) = (unsigned char)TIFFGetG(raster[pos]);
	369	*(ptr++) = (unsigned char)TIFFGetB(raster[pos]);
	370	if ( hasAlpha )
	371	*(alpha++) = (unsigned char)TIFFGetA(raster[pos]);
	372
	373	pos++;
	374	}
	375
	376	// subtract line we just added plus one line:
	377	ptr -= 2w3;
	378	if ( hasAlpha )
	379	alpha -= 2*w;
	380	}
	381
	382	// set the image resolution if it's available
	383	uint16 tiffRes;
	384	if ( TIFFGetField(tif, TIFFTAG_RESOLUTIONUNIT, &tiffRes) )
	385	{
	386	wxImageResolution res;
	387	switch ( tiffRes )
	388	{
	389	default:
	390	wxLogWarning(_("Unknown TIFF resolution unit %d ignored"),
	391	tiffRes);
	392	// fall through
	393
	394	case RESUNIT_NONE:
	395	res = wxIMAGE_RESOLUTION_NONE;
	396	break;
	397
	398	case RESUNIT_INCH:
	399	res = wxIMAGE_RESOLUTION_INCHES;
	400	break;
	401
	402	case RESUNIT_CENTIMETER:
	403	res = wxIMAGE_RESOLUTION_CM;
	404	break;
	405	}
	406
	407	if ( res != wxIMAGE_RESOLUTION_NONE )
	408	{
	409	float xres, yres;
	410	if ( TIFFGetField(tif, TIFFTAG_XRESOLUTION, &xres) )
	411	image->SetOption(wxIMAGE_OPTION_RESOLUTIONX, wxRound(xres));
	412
	413	if ( TIFFGetField(tif, TIFFTAG_YRESOLUTION, &yres) )
	414	image->SetOption(wxIMAGE_OPTION_RESOLUTIONY, wxRound(yres));
	415	}
	416	}
	417
	418
	419	_TIFFfree( raster );
	420
	421	TIFFClose( tif );
	422
	423	return true;
	424	}
	425
	426	int wxTIFFHandler::DoGetImageCount( wxInputStream& stream )
	427	{
	428	TIFF *tif = TIFFwxOpen( stream, "image", "r" );
	429
	430	if (!tif)
	431	return 0;
	432
	433	int dircount = 0; // according to the libtiff docs, dircount should be set to 1 here???
	434	do {
	435	dircount++;
	436	} while (TIFFReadDirectory(tif));
	437
	438	TIFFClose( tif );
	439
	440	// NOTE: this function modifies the current stream position but it's ok
	441	// (see wxImageHandler::GetImageCount)
	442
	443	return dircount;
	444	}
	445
	446	bool wxTIFFHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbose )
	447	{
	448	TIFF *tif = TIFFwxOpen( stream, "image", "w" );
	449
	450	if (!tif)
	451	{
	452	if (verbose)
	453	wxLogError( _("TIFF: Error saving image.") );
	454
	455	return false;
	456	}
	457
	458	TIFFSetField(tif, TIFFTAG_ORIENTATION, ORIENTATION_TOPLEFT);
	459	TIFFSetField(tif, TIFFTAG_IMAGEWIDTH, (uint32)image->GetWidth());
	460	TIFFSetField(tif, TIFFTAG_IMAGELENGTH, (uint32)image->GetHeight());
	461	TIFFSetField(tif, TIFFTAG_ORIENTATION, ORIENTATION_TOPLEFT);
	462	TIFFSetField(tif, TIFFTAG_PLANARCONFIG, PLANARCONFIG_CONTIG);
	463
	464	// save the image resolution if we have it
	465	int xres, yres;
	466	const wxImageResolution res = GetResolutionFromOptions(*image, &xres, &yres);
	467	uint16 tiffRes;
	468	switch ( res )
	469	{
	470	default:
	471	wxFAIL_MSG( _T("unknown image resolution units") );
	472	// fall through
	473
	474	case wxIMAGE_RESOLUTION_NONE:
	475	tiffRes = RESUNIT_NONE;
	476	break;
	477
	478	case wxIMAGE_RESOLUTION_INCHES:
	479	tiffRes = RESUNIT_INCH;
	480	break;
	481
	482	case wxIMAGE_RESOLUTION_CM:
	483	tiffRes = RESUNIT_CENTIMETER;
	484	break;
	485	}
	486
	487	if ( tiffRes != RESUNIT_NONE )
	488	{
	489	TIFFSetField(tif, TIFFTAG_RESOLUTIONUNIT, tiffRes);
	490	TIFFSetField(tif, TIFFTAG_XRESOLUTION, (float)xres);
	491	TIFFSetField(tif, TIFFTAG_YRESOLUTION, (float)yres);
	492	}
	493
	494
	495	int spp = image->GetOptionInt(wxIMAGE_OPTION_SAMPLESPERPIXEL);
	496	if ( !spp )
	497	spp = 3;
	498
	499	int bpp = image->GetOptionInt(wxIMAGE_OPTION_BITSPERSAMPLE);
	500	if ( !bpp )
	501	bpp = 8;
	502
	503	int compression = image->GetOptionInt(wxIMAGE_OPTION_COMPRESSION);
	504	if ( !compression )
	505	{
	506	// we can't use COMPRESSION_LZW because current version of libtiff
	507	// doesn't implement it ("no longer implemented due to Unisys patent
	508	// enforcement") and other compression methods are lossy so we
	509	// shouldn't use them by default -- and the only remaining one is none
	510	compression = COMPRESSION_NONE;
	511	}
	512
	513	TIFFSetField(tif, TIFFTAG_SAMPLESPERPIXEL, spp);
	514	TIFFSetField(tif, TIFFTAG_BITSPERSAMPLE, bpp);
	515	TIFFSetField(tif, TIFFTAG_PHOTOMETRIC, spp*bpp == 1 ? PHOTOMETRIC_MINISBLACK
	516	: PHOTOMETRIC_RGB);
	517	TIFFSetField(tif, TIFFTAG_COMPRESSION, compression);
	518
	519	// scanlinesize if determined by spp and bpp
	520	tsize_t linebytes = (tsize_t)image->GetWidth() * spp * bpp / 8;
	521
	522	if ( (image->GetWidth() % 8 > 0) && (spp * bpp < 8) )
	523	linebytes+=1;
	524
	525	unsigned char *buf;
	526
	527	if (TIFFScanlineSize(tif) > linebytes \|\| (spp * bpp < 24))
	528	{
	529	buf = (unsigned char *)_TIFFmalloc(TIFFScanlineSize(tif));
	530	if (!buf)
	531	{
	532	if (verbose)
	533	wxLogError( _("TIFF: Couldn't allocate memory.") );
	534
	535	TIFFClose( tif );
	536
	537	return false;
	538	}
	539	}
	540	else
	541	{
	542	buf = NULL;
	543	}
	544
	545	TIFFSetField(tif, TIFFTAG_ROWSPERSTRIP,TIFFDefaultStripSize(tif, (uint32) -1));
	546
	547	unsigned char *ptr = image->GetData();
	548	for ( int row = 0; row < image->GetHeight(); row++ )
	549	{
	550	if ( buf )
	551	{
	552	if ( spp * bpp > 1 )
	553	{
	554	// color image
	555	memcpy(buf, ptr, image->GetWidth());
	556	}
	557	else // black and white image
	558	{
	559	for ( int column = 0; column < linebytes; column++ )
	560	{
	561	uint8 reverse = 0;
	562	for ( int bp = 0; bp < 8; bp++ )
	563	{
	564	if ( ptr[column24 + bp3] > 0 )
	565	{
	566	// check only red as this is sufficient
	567	reverse = (uint8)(reverse \| 128 >> bp);
	568	}
	569	}
	570
	571	buf[column] = reverse;
	572	}
	573	}
	574	}
	575
	576	if ( TIFFWriteScanline(tif, buf ? buf : ptr, (uint32)row, 0) < 0 )
	577	{
	578	if (verbose)
	579	wxLogError( _("TIFF: Error writing image.") );
	580
	581	TIFFClose( tif );
	582	if (buf)
	583	_TIFFfree(buf);
	584
	585	return false;
	586	}
	587
	588	ptr += image->GetWidth()*3;
	589	}
	590
	591	(void) TIFFClose(tif);
	592
	593	if (buf)
	594	_TIFFfree(buf);
	595
	596	return true;
	597	}
	598
	599	bool wxTIFFHandler::DoCanRead( wxInputStream& stream )
	600	{
	601	unsigned char hdr[2];
	602
	603	if ( !stream.Read(&hdr[0], WXSIZEOF(hdr)) ) // it's ok to modify the stream position here
	604	return false;
	605
	606	return (hdr[0] == 'I' && hdr[1] == 'I') \|\|
	607	(hdr[0] == 'M' && hdr[1] == 'M');
	608	}
	609
	610	#endif // wxUSE_STREAMS
	611
	612	#endif // wxUSE_LIBTIFF