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_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 npixels;
    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));

    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 ( 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::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);

    // 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)) )
        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_type = wxBITMAP_TYPE_TIF;
	112	m_mime = wxT("image/tiff");
	113	TIFFSetWarningHandler((TIFFErrorHandler) TIFFwxWarningHandler);
	114	TIFFSetErrorHandler((TIFFErrorHandler) TIFFwxErrorHandler);
	115	}
	116
	117	#if wxUSE_STREAMS
	118
	119	// helper to translate our, possibly 64 bit, wxFileOffset to TIFF, always 32
	120	// bit, toff_t
	121	static toff_t wxFileOffsetToTIFF(wxFileOffset ofs)
	122	{
	123	if ( ofs == wxInvalidOffset )
	124	return (toff_t)-1;
	125
	126	toff_t tofs = wx_truncate_cast(toff_t, ofs);
	127	wxCHECK_MSG( (wxFileOffset)tofs == ofs, (toff_t)-1,
	128	_T("TIFF library doesn't support large files") );
	129
	130	return tofs;
	131	}
	132
	133	// another helper to convert standard seek mode to our
	134	static wxSeekMode wxSeekModeFromTIFF(int whence)
	135	{
	136	switch ( whence )
	137	{
	138	case SEEK_SET:
	139	return wxFromStart;
	140
	141	case SEEK_CUR:
	142	return wxFromCurrent;
	143
	144	case SEEK_END:
	145	return wxFromEnd;
	146
	147	default:
	148	return wxFromCurrent;
	149	}
	150	}
	151
	152	extern "C"
	153	{
	154
	155	tsize_t TIFFLINKAGEMODE
	156	wxTIFFNullProc(thandle_t WXUNUSED(handle),
	157	tdata_t WXUNUSED(buf),
	158	tsize_t WXUNUSED(size))
	159	{
	160	return (tsize_t) -1;
	161	}
	162
	163	tsize_t TIFFLINKAGEMODE
	164	wxTIFFReadProc(thandle_t handle, tdata_t buf, tsize_t size)
	165	{
	166	wxInputStream stream = (wxInputStream) handle;
	167	stream->Read( (void*) buf, (size_t) size );
	168	return wx_truncate_cast(tsize_t, stream->LastRead());
	169	}
	170
	171	tsize_t TIFFLINKAGEMODE
	172	wxTIFFWriteProc(thandle_t handle, tdata_t buf, tsize_t size)
	173	{
	174	wxOutputStream stream = (wxOutputStream) handle;
	175	stream->Write( (void*) buf, (size_t) size );
	176	return wx_truncate_cast(tsize_t, stream->LastWrite());
	177	}
	178
	179	toff_t TIFFLINKAGEMODE
	180	wxTIFFSeekIProc(thandle_t handle, toff_t off, int whence)
	181	{
	182	wxInputStream stream = (wxInputStream) handle;
	183
	184	return wxFileOffsetToTIFF(stream->SeekI((wxFileOffset)off,
	185	wxSeekModeFromTIFF(whence)));
	186	}
	187
	188	toff_t TIFFLINKAGEMODE
	189	wxTIFFSeekOProc(thandle_t handle, toff_t off, int whence)
	190	{
	191	wxOutputStream stream = (wxOutputStream) handle;
	192
	193	return wxFileOffsetToTIFF(stream->SeekO((wxFileOffset)off,
	194	wxSeekModeFromTIFF(whence)));
	195	}
	196
	197	int TIFFLINKAGEMODE
	198	wxTIFFCloseIProc(thandle_t WXUNUSED(handle))
	199	{
	200	// there is no need to close the input stream
	201	return 0;
	202	}
	203
	204	int TIFFLINKAGEMODE
	205	wxTIFFCloseOProc(thandle_t handle)
	206	{
	207	wxOutputStream stream = (wxOutputStream) handle;
	208
	209	return stream->Close() ? 0 : -1;
	210	}
	211
	212	toff_t TIFFLINKAGEMODE
	213	wxTIFFSizeProc(thandle_t handle)
	214	{
	215	wxStreamBase stream = (wxStreamBase) handle;
	216	return (toff_t) stream->GetSize();
	217	}
	218
	219	int TIFFLINKAGEMODE
	220	wxTIFFMapProc(thandle_t WXUNUSED(handle),
	221	tdata_t* WXUNUSED(pbase),
	222	toff_t* WXUNUSED(psize))
	223	{
	224	return 0;
	225	}
	226
	227	void TIFFLINKAGEMODE
	228	wxTIFFUnmapProc(thandle_t WXUNUSED(handle),
	229	tdata_t WXUNUSED(base),
	230	toff_t WXUNUSED(size))
	231	{
	232	}
	233
	234	} // extern "C"
	235
	236	TIFF*
	237	TIFFwxOpen(wxInputStream &stream, const char* name, const char* mode)
	238	{
	239	TIFF* tif = TIFFClientOpen(name, mode,
	240	(thandle_t) &stream,
	241	wxTIFFReadProc, wxTIFFNullProc,
	242	wxTIFFSeekIProc, wxTIFFCloseIProc, wxTIFFSizeProc,
	243	wxTIFFMapProc, wxTIFFUnmapProc);
	244
	245	return tif;
	246	}
	247
	248	TIFF*
	249	TIFFwxOpen(wxOutputStream &stream, const char* name, const char* mode)
	250	{
	251	TIFF* tif = TIFFClientOpen(name, mode,
	252	(thandle_t) &stream,
	253	wxTIFFNullProc, wxTIFFWriteProc,
	254	wxTIFFSeekOProc, wxTIFFCloseOProc, wxTIFFSizeProc,
	255	wxTIFFMapProc, wxTIFFUnmapProc);
	256
	257	return tif;
	258	}
	259
	260	bool wxTIFFHandler::LoadFile( wxImage *image, wxInputStream& stream, bool verbose, int index )
	261	{
	262	if (index == -1)
	263	index = 0;
	264
	265	image->Destroy();
	266
	267	TIFF *tif = TIFFwxOpen( stream, "image", "r" );
	268
	269	if (!tif)
	270	{
	271	if (verbose)
	272	wxLogError( _("TIFF: Error loading image.") );
	273
	274	return false;
	275	}
	276
	277	if (!TIFFSetDirectory( tif, (tdir_t)index ))
	278	{
	279	if (verbose)
	280	wxLogError( _("Invalid TIFF image index.") );
	281
	282	TIFFClose( tif );
	283
	284	return false;
	285	}
	286
	287	uint32 w, h;
	288	uint32 npixels;
	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	npixels = w * h;
	303
	304	raster = (uint32) _TIFFmalloc( npixels sizeof(uint32) );
	305
	306	if (!raster)
	307	{
	308	if (verbose)
	309	wxLogError( _("TIFF: Couldn't allocate memory.") );
	310
	311	TIFFClose( tif );
	312
	313	return false;
	314	}
	315
	316	image->Create( (int)w, (int)h );
	317	if (!image->Ok())
	318	{
	319	if (verbose)
	320	wxLogError( _("TIFF: Couldn't allocate memory.") );
	321
	322	_TIFFfree( raster );
	323	TIFFClose( tif );
	324
	325	return false;
	326	}
	327
	328	if ( hasAlpha )
	329	image->SetAlpha();
	330
	331	if (!TIFFReadRGBAImage( tif, w, h, raster, 0 ))
	332	{
	333	if (verbose)
	334	wxLogError( _("TIFF: Error reading image.") );
	335
	336	_TIFFfree( raster );
	337	image->Destroy();
	338	TIFFClose( tif );
	339
	340	return false;
	341	}
	342
	343	unsigned char *ptr = image->GetData();
	344	ptr += w3(h-1);
	345
	346	unsigned char *alpha = hasAlpha ? image->GetAlpha() : NULL;
	347	if ( hasAlpha )
	348	alpha += w*(h-1);
	349
	350	uint32 pos = 0;
	351
	352	for (uint32 i = 0; i < h; i++)
	353	{
	354	for (uint32 j = 0; j < w; j++)
	355	{
	356	*(ptr++) = (unsigned char)TIFFGetR(raster[pos]);
	357	*(ptr++) = (unsigned char)TIFFGetG(raster[pos]);
	358	*(ptr++) = (unsigned char)TIFFGetB(raster[pos]);
	359	if ( hasAlpha )
	360	*(alpha++) = (unsigned char)TIFFGetA(raster[pos]);
	361
	362	pos++;
	363	}
	364
	365	// subtract line we just added plus one line:
	366	ptr -= 2w3;
	367	if ( hasAlpha )
	368	alpha -= 2*w;
	369	}
	370
	371	// set the image resolution if it's available
	372	uint16 tiffRes;
	373	if ( TIFFGetField(tif, TIFFTAG_RESOLUTIONUNIT, &tiffRes) )
	374	{
	375	wxImageResolution res;
	376	switch ( tiffRes )
	377	{
	378	default:
	379	wxLogWarning(_("Unknown TIFF resolution unit %d ignored"),
	380	tiffRes);
	381	// fall through
	382
	383	case RESUNIT_NONE:
	384	res = wxIMAGE_RESOLUTION_NONE;
	385	break;
	386
	387	case RESUNIT_INCH:
	388	res = wxIMAGE_RESOLUTION_INCHES;
	389	break;
	390
	391	case RESUNIT_CENTIMETER:
	392	res = wxIMAGE_RESOLUTION_CM;
	393	break;
	394	}
	395
	396	if ( res != wxIMAGE_RESOLUTION_NONE )
	397	{
	398	float xres, yres;
	399	if ( TIFFGetField(tif, TIFFTAG_XRESOLUTION, &xres) )
	400	image->SetOption(wxIMAGE_OPTION_RESOLUTIONX, wxRound(xres));
	401
	402	if ( TIFFGetField(tif, TIFFTAG_YRESOLUTION, &yres) )
	403	image->SetOption(wxIMAGE_OPTION_RESOLUTIONY, wxRound(yres));
	404	}
	405	}
	406
	407
	408	_TIFFfree( raster );
	409
	410	TIFFClose( tif );
	411
	412	return true;
	413	}
	414
	415	int wxTIFFHandler::GetImageCount( wxInputStream& stream )
	416	{
	417	TIFF *tif = TIFFwxOpen( stream, "image", "r" );
	418
	419	if (!tif)
	420	return 0;
	421
	422	int dircount = 0; // according to the libtiff docs, dircount should be set to 1 here???
	423	do {
	424	dircount++;
	425	} while (TIFFReadDirectory(tif));
	426
	427	TIFFClose( tif );
	428
	429	return dircount;
	430	}
	431
	432	bool wxTIFFHandler::SaveFile( wxImage *image, wxOutputStream& stream, bool verbose )
	433	{
	434	TIFF *tif = TIFFwxOpen( stream, "image", "w" );
	435
	436	if (!tif)
	437	{
	438	if (verbose)
	439	wxLogError( _("TIFF: Error saving image.") );
	440
	441	return false;
	442	}
	443
	444	TIFFSetField(tif, TIFFTAG_ORIENTATION, ORIENTATION_TOPLEFT);
	445	TIFFSetField(tif, TIFFTAG_IMAGEWIDTH, (uint32)image->GetWidth());
	446	TIFFSetField(tif, TIFFTAG_IMAGELENGTH, (uint32)image->GetHeight());
	447	TIFFSetField(tif, TIFFTAG_ORIENTATION, ORIENTATION_TOPLEFT);
	448	TIFFSetField(tif, TIFFTAG_PLANARCONFIG, PLANARCONFIG_CONTIG);
	449
	450	// save the image resolution if we have it
	451	int xres, yres;
	452	const wxImageResolution res = GetResolutionFromOptions(*image, &xres, &yres);
	453	uint16 tiffRes;
	454	switch ( res )
	455	{
	456	default:
	457	wxFAIL_MSG( _T("unknown image resolution units") );
	458	// fall through
	459
	460	case wxIMAGE_RESOLUTION_NONE:
	461	tiffRes = RESUNIT_NONE;
	462	break;
	463
	464	case wxIMAGE_RESOLUTION_INCHES:
	465	tiffRes = RESUNIT_INCH;
	466	break;
	467
	468	case wxIMAGE_RESOLUTION_CM:
	469	tiffRes = RESUNIT_CENTIMETER;
	470	break;
	471	}
	472
	473	if ( tiffRes != RESUNIT_NONE )
	474	{
	475	TIFFSetField(tif, TIFFTAG_RESOLUTIONUNIT, tiffRes);
	476	TIFFSetField(tif, TIFFTAG_XRESOLUTION, (float)xres);
	477	TIFFSetField(tif, TIFFTAG_YRESOLUTION, (float)yres);
	478	}
	479
	480
	481	int spp = image->GetOptionInt(wxIMAGE_OPTION_SAMPLESPERPIXEL);
	482	if ( !spp )
	483	spp = 3;
	484
	485	int bpp = image->GetOptionInt(wxIMAGE_OPTION_BITSPERSAMPLE);
	486	if ( !bpp )
	487	bpp = 8;
	488
	489	int compression = image->GetOptionInt(wxIMAGE_OPTION_COMPRESSION);
	490	if ( !compression )
	491	{
	492	// we can't use COMPRESSION_LZW because current version of libtiff
	493	// doesn't implement it ("no longer implemented due to Unisys patent
	494	// enforcement") and other compression methods are lossy so we
	495	// shouldn't use them by default -- and the only remaining one is none
	496	compression = COMPRESSION_NONE;
	497	}
	498
	499	TIFFSetField(tif, TIFFTAG_SAMPLESPERPIXEL, spp);
	500	TIFFSetField(tif, TIFFTAG_BITSPERSAMPLE, bpp);
	501	TIFFSetField(tif, TIFFTAG_PHOTOMETRIC, spp*bpp == 1 ? PHOTOMETRIC_MINISBLACK
	502	: PHOTOMETRIC_RGB);
	503	TIFFSetField(tif, TIFFTAG_COMPRESSION, compression);
	504
	505	// scanlinesize if determined by spp and bpp
	506	tsize_t linebytes = (tsize_t)image->GetWidth() * spp * bpp / 8;
	507
	508	if ( (image->GetWidth() % 8 > 0) && (spp * bpp < 8) )
	509	linebytes+=1;
	510
	511	unsigned char *buf;
	512
	513	if (TIFFScanlineSize(tif) > linebytes \|\| (spp * bpp < 24))
	514	{
	515	buf = (unsigned char *)_TIFFmalloc(TIFFScanlineSize(tif));
	516	if (!buf)
	517	{
	518	if (verbose)
	519	wxLogError( _("TIFF: Couldn't allocate memory.") );
	520
	521	TIFFClose( tif );
	522
	523	return false;
	524	}
	525	}
	526	else
	527	{
	528	buf = NULL;
	529	}
	530
	531	TIFFSetField(tif, TIFFTAG_ROWSPERSTRIP,TIFFDefaultStripSize(tif, (uint32) -1));
	532
	533	unsigned char *ptr = image->GetData();
	534	for ( int row = 0; row < image->GetHeight(); row++ )
	535	{
	536	if ( buf )
	537	{
	538	if ( spp * bpp > 1 )
	539	{
	540	// color image
	541	memcpy(buf, ptr, image->GetWidth());
	542	}
	543	else // black and white image
	544	{
	545	for ( int column = 0; column < linebytes; column++ )
	546	{
	547	uint8 reverse = 0;
	548	for ( int bp = 0; bp < 8; bp++ )
	549	{
	550	if ( ptr[column24 + bp3] > 0 )
	551	{
	552	// check only red as this is sufficient
	553	reverse = (uint8)(reverse \| 128 >> bp);
	554	}
	555	}
	556
	557	buf[column] = reverse;
	558	}
	559	}
	560	}
	561
	562	if ( TIFFWriteScanline(tif, buf ? buf : ptr, (uint32)row, 0) < 0 )
	563	{
	564	if (verbose)
	565	wxLogError( _("TIFF: Error writing image.") );
	566
	567	TIFFClose( tif );
	568	if (buf)
	569	_TIFFfree(buf);
	570
	571	return false;
	572	}
	573
	574	ptr += image->GetWidth()*3;
	575	}
	576
	577	(void) TIFFClose(tif);
	578
	579	if (buf)
	580	_TIFFfree(buf);
	581
	582	return true;
	583	}
	584
	585	bool wxTIFFHandler::DoCanRead( wxInputStream& stream )
	586	{
	587	unsigned char hdr[2];
	588
	589	if ( !stream.Read(&hdr[0], WXSIZEOF(hdr)) )
	590	return false;
	591
	592	return (hdr[0] == 'I' && hdr[1] == 'I') \|\|
	593	(hdr[0] == 'M' && hdr[1] == 'M');
	594	}
	595
	596	#endif // wxUSE_STREAMS
	597
	598	#endif // wxUSE_LIBTIFF