/usr/include/synfig-1.0/synfig/rendering/resource.h is in libsynfig-dev 1.2.1-0ubuntu4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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/*! \file synfig/rendering/resource.h
** \brief Resource Header
**
** $Id$
**
** \legal
** ......... ... 2015 Ivan Mahonin
**
** This package is free 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 package is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
** General Public License for more details.
** \endlegal
*/
/* ========================================================================= */
/* === S T A R T =========================================================== */
#ifndef __SYNFIG_RENDERING_RESOURCE_H
#define __SYNFIG_RENDERING_RESOURCE_H
/* === H E A D E R S ======================================================= */
#include <vector>
#include <ETL/handle>
#include <ETL/mutex>
/* === M A C R O S ========================================================= */
/* === T Y P E D E F S ===================================================== */
/* === C L A S S E S & S T R U C T S ======================================= */
namespace synfig
{
namespace rendering
{
// TODO: move to ::synfig or to ::etl
class Resource: public etl::shared_object
{
public:
typedef unsigned long long Id;
private:
static Id last_id;
public:
typedef etl::handle<Resource> Handle;
typedef std::vector<Handle> List;
class Storage: public etl::virtual_shared_object
{
public:
typedef etl::handle<Storage> Handle;
private:
mutable int refcount;
#ifdef ETL_LOCK_REFCOUNTS
mutable etl::mutex mtx;
#endif
friend class Resource;
List resources;
static const List blank;
public:
Storage();
~Storage();
virtual void ref() const;
virtual bool unref_inactive() const;
virtual bool unref() const;
virtual int count() const;
};
private:
const Id id;
mutable Storage::Handle alternatives;
mutable etl::mutex get_alternative_mtx;
public:
Resource(): id(++last_id) { }
Id get_id() const { return id; }
const List& get_alternatives() const
{ return alternatives ? alternatives->resources : Storage::blank; }
void set_alternative(Handle other) const;
void unset_alternative() const;
template<typename T>
etl::handle<T> find_alternative() const
{
const List &resources = get_alternatives();
for(List::const_iterator i = resources.begin(); i != resources.end(); ++i)
if (etl::handle<T> alternative = etl::handle<T>::cast_dynamic(*i))
return alternative;
return etl::handle<T>();
}
template<typename T>
etl::handle<T> get_alternative() const
{
etl::mutex::lock lock(get_alternative_mtx);
etl::handle<T> alternative = find_alternative<T>();
if (!alternative)
{
alternative = new T(*this);
set_alterntive(alternative);
}
return alternative;
}
};
} /* end namespace rendering */
} /* end namespace synfig */
/* -- E N D ----------------------------------------------------------------- */
#endif
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