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// tiffstream.cc -- image streams producing TIFF files
// Copyright (C) 2008, 2009 SEIKO EPSON CORPORATION
//
// This file is part of the 'iscan' program.
//
// The 'iscan' program is free-ish software.
// You can redistribute it and/or modify it under the terms of the GNU
// General Public License as published by the Free Software Foundation;
// either version 2 of the License or at your option any later version.
//
// This program is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of FITNESS
// FOR A PARTICULAR PURPOSE or MERCHANTABILITY.
// See the GNU General Public License for more details.
//
// You should have received a verbatim copy of the GNU General Public
// License along with this program; if not, write to:
//
// Free Software Foundation, Inc.
// 59 Temple Place, Suite 330
// Boston, MA 02111-1307 USA
//
// As a special exception, the copyright holders give permission
// to link the code of this program with the esmod library and
// distribute linked combinations including the two. You must obey
// the GNU General Public License in all respects for all of the
// code used other than esmod.
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "tiffstream.hh"
#include <cstdlib>
#include <ios>
#include <stdexcept>
namespace iscan
{
// Forward declaration of handlers and support functions.
static void handle_error (const char *module, const char *fmt, va_list ap);
static void handle_warning (const char *module, const char *fmt, va_list ap);
tiffstream::tiffstream (FILE *fp, const string& name)
: _stream (fp)
{
if (!_stream) throw std::invalid_argument ("invalid file handle");
init (name); // handles HAVE_TIFFIO_H only stuff
}
tiffstream::~tiffstream (void)
{
#if HAVE_TIFFIO_H
lib->Close (_tiff);
#endif
fflush (_stream);
}
imgstream&
tiffstream::write (const byte_type *line, size_type n)
{
if (!line || 0 == n) return *this;
if (0 == _page)
{
set_tags ();
}
#if HAVE_TIFFIO_H
if (1 != lib->WriteScanline (_tiff, const_cast<char *> (line), _row, 1))
{
throw std::ios_base::failure ("failure writing TIFF scanline");
}
++_row;
#endif /* HAVE_TIFFIO_H */
return *this;
}
void
tiffstream::next (void)
{
#if HAVE_TIFFIO_H
if (0 == _row) return;
#endif
if (0 < _page)
{
#if HAVE_TIFFIO_H
if (1 != lib->WriteDirectory (_tiff))
{
throw std::runtime_error ("failure writing TIFF directory");
}
#endif
}
set_tags ();
}
bool
tiffstream::is_usable (void)
{
if (lib)
{
return lib->is_usable;
}
lib = new (std::nothrow) tiff_lib_handle ();
if (!lib)
{
return false;
}
lib->is_usable = false;
lib->message = string ();
lib->lib = NULL;
#if HAVE_TIFFIO_H
try
{
imgstream::dlopen ("libtiff", validate);
}
catch (std::runtime_error& e)
{
lib->message = e.what ();
return lib->is_usable;
}
#endif /* HAVE_TIFFIO_H */
return lib->is_usable;
}
#if HAVE_TIFFIO_H
#define funcsym(name) \
lib->name = ((tiffstream::tiff_lib_handle::name##_f) \
imgstream::dlsym (lib->lib, "TIFF"#name));
#endif
bool
tiffstream::validate (lt_dlhandle h)
{
if (!h) return false;
#if HAVE_TIFFIO_H
lib->lib = h;
funcsym (Open);
funcsym (FdOpen);
funcsym (Close);
funcsym (WriteDirectory);
funcsym (WriteScanline);
funcsym (Flush);
funcsym (SetField);
funcsym (SetErrorHandler);
funcsym (SetWarningHandler);
lib->is_usable = (lib->Open
&& lib->FdOpen
&& lib->Close
&& lib->WriteDirectory
&& lib->WriteScanline
&& lib->Flush
&& lib->SetField
&& lib->SetErrorHandler
&& lib->SetWarningHandler);
if (lib->is_usable)
{
lib->SetErrorHandler (handle_error);
lib->SetWarningHandler (handle_warning);
}
#endif /* HAVE_TIFFIO_H */
return lib->is_usable;
}
#if HAVE_TIFFIO_H
#undef funcsym
#endif
void
tiffstream::set_tags (void)
{
check_consistency ();
#if HAVE_TIFFIO_H
lib->SetField (_tiff, TIFFTAG_SAMPLESPERPIXEL, (RGB == _cspc ? 3 : 1));
uint16 pm;
if (mono == _cspc) pm = PHOTOMETRIC_MINISWHITE;
if (grey == _cspc) pm = PHOTOMETRIC_MINISBLACK;
if (RGB == _cspc) pm = PHOTOMETRIC_RGB;
lib->SetField (_tiff, TIFFTAG_PHOTOMETRIC, pm);
if (RGB == _cspc)
lib->SetField (_tiff, TIFFTAG_PLANARCONFIG, PLANARCONFIG_CONTIG);
lib->SetField (_tiff, TIFFTAG_BITSPERSAMPLE, _bits);
lib->SetField (_tiff, TIFFTAG_IMAGEWIDTH , _h_sz);
lib->SetField (_tiff, TIFFTAG_IMAGELENGTH, _v_sz);
lib->SetField (_tiff, TIFFTAG_ROWSPERSTRIP, 1);
if (0 != _hres && 0 != _vres)
{
lib->SetField (_tiff, TIFFTAG_XRESOLUTION, float (_hres));
lib->SetField (_tiff, TIFFTAG_YRESOLUTION, float (_vres));
lib->SetField (_tiff, TIFFTAG_RESOLUTIONUNIT, RESUNIT_INCH);
}
lib->SetField (_tiff, TIFFTAG_COMPRESSION, COMPRESSION_NONE);
_row = 0;
#endif /* HAVE_TIFFIO_H */
++_page;
return;
}
void
tiffstream::check_consistency (void) const
{
if (!(mono == _cspc || grey == _cspc || RGB == _cspc))
{
throw std::logic_error ("unsupported colour space");
}
if (!(1 == _bits || 8 == _bits))
{
throw std::logic_error ("unsupported bit depth");
}
}
void
tiffstream::init (const string& name)
{
if (!is_usable ())
{
throw std::runtime_error (lib->message);
}
#if HAVE_TIFFIO_H
_row = 0;
// libtiff uses 'b' to signal big-endian, not binary as fopen()!
_tiff = lib->Open (name.c_str (), "w");
if (!_tiff) throw std::bad_alloc ();
#endif
}
tiffstream::tiff_lib_handle *tiffstream::lib = NULL;
// Definition of handlers and support functions.
/*! \todo Implement when debugging framework has been worked out
*/
static void
handle_error (const char *module, const char *fmt, va_list ap)
{
}
/*! \todo Implement when debugging framework has been worked out
*/
static void
handle_warning (const char *module, const char *fmt, va_list ap)
{
}
} // namespace iscan
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