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/*
Copyright 2010-2012 Kenneth Riddile, Christian Henning
Use, modification and distribution are subject to the Boost Software License,
Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
http://www.boost.org/LICENSE_1_0.txt).
*/
/*************************************************************************************************/
#ifndef BOOST_GIL_EXTENSION_IO_TARGA_DETAIL_WRITE_HPP
#define BOOST_GIL_EXTENSION_IO_TARGA_DETAIL_WRITE_HPP
////////////////////////////////////////////////////////////////////////////////////////
/// \file
/// \brief
/// \author Kenneth Riddile, Christian Henning \n
///
/// \date 2010-2012 \n
///
////////////////////////////////////////////////////////////////////////////////////////
#include <vector>
#include <boost/gil/io/base.hpp>
#include <boost/gil/io/device.hpp>
#include <boost/gil/extension/io/targa/tags.hpp>
#include <boost/gil/extension/io/targa/detail/writer_backend.hpp>
namespace boost { namespace gil {
#if BOOST_WORKAROUND(BOOST_MSVC, >= 1400)
#pragma warning(push)
#pragma warning(disable:4512) //assignment operator could not be generated
#endif
namespace detail {
template < int N > struct get_targa_view_type {};
template <> struct get_targa_view_type< 3 > { typedef bgr8_view_t type; };
template <> struct get_targa_view_type< 4 > { typedef bgra8_view_t type; };
struct targa_write_is_supported
{
template< typename View >
struct apply
: public is_write_supported< typename get_pixel_type< View >::type
, targa_tag
>
{};
};
} // detail
///
/// TARGA Writer
///
template< typename Device >
class writer< Device
, targa_tag
>
: public writer_backend< Device
, targa_tag
>
{
private:
typedef writer_backend< Device, targa_tag > backend_t;
public:
writer( const Device& io_dev
, const image_write_info< targa_tag >& info
)
: backend_t( io_dev
, info
)
{}
template<typename View>
void apply( const View& view )
{
write( view );
}
private:
template< typename View >
void write( const View& view )
{
uint8_t bit_depth = static_cast<uint8_t>( num_channels<View>::value * 8 );
// write the TGA header
this->_io_dev.write_uint8( 0 ); // offset
this->_io_dev.write_uint8( targa_color_map_type::_rgb );
this->_io_dev.write_uint8( targa_image_type::_rgb );
this->_io_dev.write_uint16( 0 ); // color map start
this->_io_dev.write_uint16( 0 ); // color map length
this->_io_dev.write_uint8( 0 ); // color map depth
this->_io_dev.write_uint16( 0 ); // x origin
this->_io_dev.write_uint16( 0 ); // y origin
this->_io_dev.write_uint16( static_cast<uint16_t>( view.width() ) ); // width in pixels
this->_io_dev.write_uint16( static_cast<uint16_t>( view.height() ) ); // height in pixels
this->_io_dev.write_uint8( bit_depth );
if( 32 == bit_depth )
{
this->_io_dev.write_uint8( 8 ); // 8-bit alpha channel descriptor
}
else
{
this->_io_dev.write_uint8( 0 );
}
write_image< View
, typename detail::get_targa_view_type< num_channels< View >::value >::type
>( view );
}
template< typename View
, typename TGA_View
>
void write_image( const View& view )
{
size_t row_size = view.width() * num_channels<View>::value;
byte_vector_t buffer( row_size );
std::fill( buffer.begin(), buffer.end(), 0 );
TGA_View row = interleaved_view( view.width()
, 1
, reinterpret_cast<typename TGA_View::value_type*>( &buffer.front() )
, row_size
);
for( typename View::y_coord_t y = view.height() - 1; y > -1; --y )
{
copy_pixels( subimage_view( view
, 0
, static_cast<int>( y )
, static_cast<int>( view.width() )
, 1
)
, row
);
this->_io_dev.write( &buffer.front(), row_size );
}
}
};
///
/// TARGA Dynamic Image Writer
///
template< typename Device >
class dynamic_image_writer< Device
, targa_tag
>
: public writer< Device
, targa_tag
>
{
typedef writer< Device
, targa_tag
> parent_t;
public:
dynamic_image_writer( const Device& io_dev
, const image_write_info< targa_tag >& info
)
: parent_t( io_dev
, info
)
{}
template< typename Views >
void apply( const any_image_view< Views >& views )
{
detail::dynamic_io_fnobj< detail::targa_write_is_supported
, parent_t
> op( this );
apply_operation( views, op );
}
};
#if BOOST_WORKAROUND(BOOST_MSVC, >= 1400)
#pragma warning(pop)
#endif
} // gil
} // boost
#endif
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