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/*
CLAW - a C++ Library Absolutely Wonderful
CLAW is a free library without any particular aim but being useful to
anyone.
Copyright (C) 2005-2011 Julien Jorge
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
contact: julien.jorge@gamned.org
*/
/**
* \file gif.cpp
* \brief Implementation of the claw::graphic::gif class.
* \author Julien Jorge
*/
#include "claw/gif.hpp"
#include <algorithm>
#include <claw/functional.hpp>
/*----------------------------------------------------------------------------*/
/**
* \brief Tell if the file contains a global palette.
*/
bool claw::graphic::gif::screen_descriptor::has_global_color_table() const
{
return (packed & 0x80) != 0;
} // gif::screen_descriptor::has_global_color_table()
/*----------------------------------------------------------------------------*/
/**
* \brief Get the size of the palette, if any.
*/
unsigned int claw::graphic::gif::screen_descriptor::color_palette_size() const
{
if ( !has_global_color_table() )
return 0;
else
return 1 << ((packed & 0x07) + 1);
} // gif::screen_descriptor::color_palette_size()
/*----------------------------------------------------------------------------*/
/**
* \brief Get the disposal method of the frame.
*/
claw::graphic::gif::graphic_control_extension::disposal_method
claw::graphic::gif::graphic_control_extension::get_disposal_method() const
{
switch( (packed & 0x1C) >> 2 )
{
case 0: return dispose_none;
case 1: return dispose_do_not_dispose;
case 2: return dispose_background;
case 3: return dispose_previous;
default:
return dispose_previous;
}
} // gif::graphic_control_extension::get_disposal_method()
/*----------------------------------------------------------------------------*/
/**
* \brief Tell if the palette contains a transparent color.
*/
bool
claw::graphic::gif::graphic_control_extension::has_transparent_color() const
{
return (packed & 0x01) != 0;
} // gif::graphic_control_extension::has_transparent_color()
/*----------------------------------------------------------------------------*/
/**
* \brief Tell if the file contains a global palette.
*/
bool claw::graphic::gif::image_descriptor::has_color_table() const
{
return (packed & 0x80) != 0;
} // gif::image_descriptor::has_color_table()
/*----------------------------------------------------------------------------*/
/**
* \brief Tell if the data is interlaced.
*/
bool claw::graphic::gif::image_descriptor::is_interlaced() const
{
return (packed & 0x40) != 0;
} // gif::image_descriptor::is_interlaced()
/*----------------------------------------------------------------------------*/
/**
* \brief Get the size of the palette, if any.
*/
unsigned int claw::graphic::gif::image_descriptor::color_palette_size() const
{
if ( !has_color_table() )
return 0;
else
return 1 << ((packed & 0x07) + 1);
} // gif::image_descriptor::color_palette_size()
/*----------------------------------------------------------------------------*/
/**
* \brief Constructor.
*/
claw::graphic::gif::gif()
{
} // gif::gif() [copy constructor]
/*----------------------------------------------------------------------------*/
/**
* \brief Copy constructor.
* \param that Image to copy from.
*/
claw::graphic::gif::gif( const gif& that )
: image(that)
{
frame_list::const_iterator it;
for (it=that.m_frame.begin(); it!=that.m_frame.end(); ++it)
m_frame.push_back( new frame(**it) );
} // gif::gif() [copy constructor]
/*----------------------------------------------------------------------------*/
/**
* \brief Constructor. Load an image from a gif file.
* \param f Gif file.
*/
claw::graphic::gif::gif( std::istream& f )
{
reader(*this, m_frame, f);
} // gif::gif() [constructor, from file]
/*----------------------------------------------------------------------------*/
/**
* \brief Destructor.
*/
claw::graphic::gif::~gif()
{
std::for_each
( m_frame.begin(), m_frame.end(), claw::delete_function<frame*>() );
m_frame.clear();
} // gif::~gif()
/*----------------------------------------------------------------------------*/
/**
* \brief Assignment.
* \param that The gif to copy from.
*/
claw::graphic::gif& claw::graphic::gif::operator=( const gif& that )
{
gif tmp(that);
std::swap(tmp, *this);
return *this;
} // gif::operator=()
/*----------------------------------------------------------------------------*/
/**
* \brief Swap the content of two gifs.
* \param that The gif to swap with.
*/
void claw::graphic::gif::swap( gif& that )
{
super::swap(that);
std::swap(m_frame, that.m_frame);
} // gif::swap()
/*----------------------------------------------------------------------------*/
/**
* \brief Get an iterator on the beginning of the frame sequence.
*/
claw::graphic::gif::frame_iterator claw::graphic::gif::frame_begin()
{
return frame_iterator(m_frame.begin());
} // gif::begin()
/*----------------------------------------------------------------------------*/
/**
* \brief Get an iterator on the end of the frame sequence.
*/
claw::graphic::gif::frame_iterator claw::graphic::gif::frame_end()
{
return frame_iterator(m_frame.end());
} // gif::end()
/*----------------------------------------------------------------------------*/
/**
* \brief Get an iterator on the beginning of the frame sequence.
*/
claw::graphic::gif::const_frame_iterator claw::graphic::gif::frame_begin() const
{
return const_frame_iterator(m_frame.begin());
} // gif::begin()
/*----------------------------------------------------------------------------*/
/**
* \brief Get an iterator on the beginning of the frame sequence.
*/
claw::graphic::gif::const_frame_iterator claw::graphic::gif::frame_end() const
{
return const_frame_iterator(m_frame.end());
} // gif::end()
/*----------------------------------------------------------------------------*/
/**
* \brief Swap the content of two gifs.
* \param a The gif to swap with \a b.
* \param b The gif to swap with \a a.
*/
void std::swap( claw::graphic::gif& a, claw::graphic::gif& b )
{
a.swap(b);
} // swap()
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