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// basic-imgstream.hh -- the mother of all image streams
// 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_basic_imgstream_hh_included
#define iscan_basic_imgstream_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"
#ifndef LT_MODULE_EXT
#define LT_MODULE_EXT LTDL_SHLIB_EXT
#endif
#ifndef LT_MODULE_PATH_VAR
#define LT_MODULE_PATH_VAR LTDL_SHLIBPATH_VAR
#endif
#ifndef LT_DLSEARCH_PATH
#define LT_DLSEARCH_PATH LTDL_SYSSEARCHPATH
#endif
#endif
#include <dirent.h>
#include <ltdl.h>
#include <stdexcept>
namespace iscan
{
using std::runtime_error;
enum colour_space
{
NONE,
monochrome,
mono = monochrome,
grayscale,
greyscale = grayscale,
gray = grayscale,
grey = grayscale,
RGB,
RGB_alpha
};
class basic_imgstream
{
public:
typedef char byte_type;
typedef size_t size_type;
virtual ~basic_imgstream (void);
virtual basic_imgstream& write (const byte_type *line, size_type n) = 0;
virtual basic_imgstream& flush (void);
virtual basic_imgstream& size (size_type h_sz, size_type v_sz);
virtual basic_imgstream& resolution (size_type hres, size_type vres);
virtual basic_imgstream& depth (size_type bits);
virtual basic_imgstream& colour (colour_space space);
virtual void rotate_180 (bool yes) {};
protected:
basic_imgstream (void);
size_type _h_sz;
size_type _v_sz;
size_type _hres;
size_type _vres;
size_type _bits;
colour_space _cspc;
private: // undefined to prevent copying
basic_imgstream (const basic_imgstream&);
basic_imgstream& operator= (const basic_imgstream&);
// API to deal with external image format libraries
protected:
typedef lt_dlhandle dl_handle;
typedef lt_ptr dl_ptr;
static dl_handle dlopen (const char *libname,
bool (*validate) (dl_handle) = NULL);
static dl_ptr dlsym (dl_handle lib, const char *funcname);
static int dlclose (dl_handle lib);
private:
static dl_handle find_dlopen (const char *libname,
bool (*validate) (dl_handle));
static const char *_libname;
friend int selector (const dirent *);
#ifdef __GNUC__
#define fundecl(returntype,funcname,arglist...) \
typedef returntype (*funcname##_f) (arglist); \
funcname##_f funcname;
#else
#error "Your compiler is not known to support macros with a variable"
#error "number of arguments. In case it does, please report this to"
#error "the library maintainers and include a suitable preprocessor"
#error "check for them to add. A patch will be most appreciated."
#endif
};
} // namespace iscan
#endif /* !defined (iscan_basic_imgstream_hh_included) */
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