//
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// Copyright 2007-2008 Christian Henning
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//
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// Distributed under the Boost Software License, Version 1.0
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// See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt
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//
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#ifndef BOOST_GIL_IO_READER_BASE_HPP
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#define BOOST_GIL_IO_READER_BASE_HPP
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#include <boost/gil/io/base.hpp>
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#include <boost/assert.hpp>
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namespace boost { namespace gil {
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/// Reader Base Class
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///
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/// It provides some basic functionality which is shared for all readers.
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/// For instance, it recreates images when necessary. It checks whether
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/// user supplied coordinates are valid.
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///
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/// @tparam FormatTag A format tag, like jpeg_tag.
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/// @tparam ConversionPolicy Conversion policy, see coversion_policies.hpp.
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template< typename FormatTag
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, typename ConversionPolicy
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>
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struct reader_base
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{
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public:
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///
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/// Default Constructor
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///
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reader_base()
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:_cc_policy()
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{}
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///
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/// Constructor
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///
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reader_base( const ConversionPolicy& cc )
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:_cc_policy( cc )
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{}
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/// Initializes an image. But also does some check ups.
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///
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/// @tparam Image Image which implements boost::gil's ImageConcept.
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///
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/// @param img The image.
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/// @param info The image read info.
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template< typename Image >
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void init_image( Image& img
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, const image_read_settings< FormatTag >& settings
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)
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{
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//setup( backend._settings._dim );
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BOOST_ASSERT(settings._dim.x && settings._dim.y);
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img.recreate( settings._dim.x
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, settings._dim.y
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);
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}
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template< typename View >
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void init_view( const View& view
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, const image_read_settings< FormatTag >&
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)
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{
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setup( view.dimensions() );
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}
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private:
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void setup( const point_t& /* dim */ )
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{
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//check_coordinates( dim );
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//if( dim == point_t( 0, 0 ))
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//{
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// _settings._dim.x = _info._width;
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// _settings._dim.y = _info._height;
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//}
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//else
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//{
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// _settings._dim = dim;
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//}
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}
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void check_coordinates( const point_t& /* dim */ )
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{
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//using int_t = point_t::value_type;
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//int_t width = static_cast< int_t >( _info._width );
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//int_t height = static_cast< int_t >( _info._height );
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//io_error_if( ( _settings._top_left.x < 0
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// || _settings._top_left.y < 0
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// || dim.x < 0
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// || dim.y < 0
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// )
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// , "User provided view has incorrect size." );
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//io_error_if( ( ( width ) < _settings._top_left.x
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// && ( width ) <= dim.x
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// && ( height ) < _settings._top_left.y
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// && ( height ) <= dim.y )
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// , "User provided view has incorrect size." );
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//io_error_if( ( ( _settings._top_left.x + dim.x ) > width
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// || ( _settings._top_left.y + dim.y ) > height
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// )
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// , "User provided view has incorrect size." );
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}
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protected:
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ConversionPolicy _cc_policy;
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};
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} // namespace gil
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} // namespace boost
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#endif
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