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// imgstream.cc -- provides an interface to write multiple images
// Copyright (C) 2008 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 "imgstream.hh"
#include "jpegstream.hh"
#include "pcxstream.hh"
#include "pngstream.hh"
#include "pnmstream.hh"
#include "pdfstream.hh"
#include "tiffstream.hh"
namespace iscan
{
imgstream::imgstream (file_opener& opener, file_format format,
bool match_direction)
: _page (0), _match_direction (match_direction),
_opener (&opener), _format (format), _configured (false)
{
_stream = create_stream ();
}
imgstream::imgstream (void)
: _page (0), _match_direction (false), _opener (NULL), _format (NO_FORMAT),
_stream (NULL), _configured (false)
{
}
imgstream::~imgstream (void)
{
delete _stream;
}
imgstream&
imgstream::write (const byte_type *data, size_type n)
{
if (!_stream) return *this;
if (!_configured)
{
_stream->size (_h_sz, _v_sz);
_stream->resolution (_hres, _vres);
_stream->colour (_cspc);
_stream->depth (_bits);
_configured = true;
}
_stream->write (data, n);
return *this;
}
imgstream&
imgstream::flush (void)
{
if (_stream) _stream->flush ();
return *this;
}
void
imgstream::next (void)
{
if (!_configured) return;
delete _stream;
_configured = false;
++_page;
++(*_opener);
_stream = create_stream ();
if (_match_direction) _stream->rotate_180 (is_back (_page));
}
bool
imgstream::is_back (unsigned long page)
{
return 0 == (page+1)%2;
}
bool
imgstream::is_usable (void)
{
return true;
}
basic_imgstream *
imgstream::create_stream (void)
{
if (PCX == _format) return new pcxstream (*_opener);
if (PNM == _format) return new pnmstream (*_opener);
if (PNG == _format) return new pngstream (*_opener);
if (JPG == _format) return new jpegstream (*_opener);
if (PDF == _format) return new pdfstream (*_opener);
if (TIF == _format) return new tiffstream (*_opener, _opener->temp ());
throw std::invalid_argument ("unsupported file format");
}
imgstream *
create_imgstream (file_opener& opener, file_format format,
bool match_direction)
{
if (opener.is_collating ())
{
if (PDF == format) return new pdfstream (opener, match_direction);
if (TIF == format) return new tiffstream (opener, opener.name ());
}
return new imgstream (opener, format, match_direction);
}
} // namespace iscan
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