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// jpegstream.hh -- image streams producing JPEG 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 then esmod.
#ifndef iscan_jpegstream_hh_included
#define iscan_jpegstream_hh_included
#ifndef __cplusplus
#error "This is a C++ header file; use a C++ compiler to compile it."
#endif
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "basic-imgstream.hh"
#include <cstdio>
#include <string>
#if HAVE_JPEGLIB_H
#include <jpeglib.h>
#endif
namespace iscan
{
using std::string;
class jpegstream : public basic_imgstream
{
public:
typedef basic_imgstream::byte_type byte_type;
typedef basic_imgstream::size_type size_type;
explicit jpegstream (FILE *fp, const string& pathname = string ());
virtual ~jpegstream (void);
virtual basic_imgstream& write (const byte_type *line, size_type n);
static bool is_usable (void);
private:
basic_imgstream& write_header (void);
void check_consistency (void) const;
void init (void);
FILE *_stream;
bool _header;
byte_type *_scanline;
static bool validate (lt_dlhandle h);
struct jpeg_lib_handle
{
bool is_usable;
string message;
lt_dlhandle lib;
#if HAVE_JPEGLIB_H
# ifndef jpeg_create_compress
fundecl (void, create_compress, jpeg_compress_struct *);
# else
fundecl (void, CreateCompress, jpeg_compress_struct *, int, size_t);
# endif
fundecl (void, finish_compress, jpeg_compress_struct *);
fundecl (void, destroy_compress, jpeg_compress_struct *);
fundecl (void, destroy, jpeg_common_struct *);
fundecl (void, stdio_dest, jpeg_compress_struct *, FILE *);
fundecl (struct jpeg_error_mgr *, std_error, jpeg_error_mgr *);
fundecl (void, write_scanlines, jpeg_compress_struct *, JSAMPLE **, int);
fundecl (void, set_defaults, jpeg_compress_struct *);
fundecl (void, start_compress, jpeg_compress_struct *, bool);
// only used for version detection purposes; available since libjpeg 7.0
fundecl (void, default_qtables, jpeg_compress_struct *, bool);
#endif /* HAVE_JPEGLIB_H */
};
static jpeg_lib_handle *lib;
#if HAVE_JPEGLIB_H
static void error_exit (j_common_ptr info);
struct jpeg_compress_struct _info;
struct jpeg_error_mgr _err;
#endif
};
} // namespace iscan
#endif /* !defined (iscan_jpegstream_hh_included) */
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