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/*
Copyright 2012 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_JPEG_DETAIL_WRITER_BACKEND_HPP
#define BOOST_GIL_EXTENSION_IO_JPEG_DETAIL_WRITER_BACKEND_HPP
////////////////////////////////////////////////////////////////////////////////////////
/// \file
/// \brief
/// \author Christian Henning \n
///
/// \date 2012 \n
///
////////////////////////////////////////////////////////////////////////////////////////
#include <boost/gil/extension/io/jpeg/tags.hpp>
#include <boost/gil/extension/io/jpeg/detail/base.hpp>
#include <memory>
namespace boost { namespace gil {
#if BOOST_WORKAROUND(BOOST_MSVC, >= 1400)
#pragma warning(push)
#pragma warning(disable:4512) //assignment operator could not be generated
#pragma warning(disable:4611) //interaction between '_setjmp' and C++ object destruction is non-portable
#endif
namespace detail {
///
/// Wrapper for libjpeg's compress object. Implements value semantics.
///
struct jpeg_compress_wrapper
{
protected:
using jpeg_compress_ptr_t = std::shared_ptr<jpeg_compress_struct>;
protected:
///
/// Default Constructor
///
jpeg_compress_wrapper()
: _jpeg_compress_ptr( new jpeg_compress_struct()
, jpeg_compress_deleter
)
{}
jpeg_compress_struct* get() { return _jpeg_compress_ptr.get(); }
const jpeg_compress_struct* get() const { return _jpeg_compress_ptr.get(); }
private:
static void jpeg_compress_deleter( jpeg_compress_struct* jpeg_compress_ptr )
{
if( jpeg_compress_ptr )
{
jpeg_destroy_compress( jpeg_compress_ptr );
delete jpeg_compress_ptr;
jpeg_compress_ptr = NULL;
}
}
private:
jpeg_compress_ptr_t _jpeg_compress_ptr;
};
} // namespace detail
///
/// JPEG Writer Backend
///
template< typename Device >
struct writer_backend< Device
, jpeg_tag
>
: public jpeg_io_base
, public detail::jpeg_compress_wrapper
{
public:
typedef jpeg_tag format_tag_t;
public:
///
/// Constructor
///
writer_backend( const Device& io_dev
, const image_write_info< jpeg_tag >& info
)
: _io_dev( io_dev )
, _info( info )
{
get()->err = jpeg_std_error( &_jerr );
get()->client_data = this;
// Error exit handler: does not return to caller.
_jerr.error_exit = &writer< Device, jpeg_tag >::error_exit;
// Fire exception in case of error.
if( setjmp( _mark )) { raise_error(); }
_dest._jdest.free_in_buffer = sizeof( buffer );
_dest._jdest.next_output_byte = buffer;
_dest._jdest.init_destination = reinterpret_cast< void(*) ( j_compress_ptr ) >( &writer< Device, jpeg_tag >::init_device );
_dest._jdest.empty_output_buffer = reinterpret_cast< boolean(*)( j_compress_ptr ) >( &writer< Device, jpeg_tag >::empty_buffer );
_dest._jdest.term_destination = reinterpret_cast< void(*) ( j_compress_ptr ) >( &writer< Device, jpeg_tag >::close_device );
_dest._this = this;
jpeg_create_compress( get() );
get()->dest = &_dest._jdest;
}
~writer_backend()
{
jpeg_finish_compress ( get() );
jpeg_destroy_compress( get() );
}
protected:
struct gil_jpeg_destination_mgr
{
jpeg_destination_mgr _jdest;
writer_backend< Device
, jpeg_tag
>* _this;
};
static void init_device( jpeg_compress_struct* cinfo )
{
gil_jpeg_destination_mgr* dest = reinterpret_cast< gil_jpeg_destination_mgr* >( cinfo->dest );
dest->_jdest.free_in_buffer = sizeof( dest->_this->buffer );
dest->_jdest.next_output_byte = dest->_this->buffer;
}
static boolean empty_buffer( jpeg_compress_struct* cinfo )
{
gil_jpeg_destination_mgr* dest = reinterpret_cast< gil_jpeg_destination_mgr* >( cinfo->dest );
dest->_this->_io_dev.write( dest->_this->buffer
, buffer_size
);
writer<Device,jpeg_tag>::init_device( cinfo );
return static_cast<boolean>(TRUE);
}
static void close_device( jpeg_compress_struct* cinfo )
{
writer_backend< Device
, jpeg_tag
>::empty_buffer( cinfo );
gil_jpeg_destination_mgr* dest = reinterpret_cast< gil_jpeg_destination_mgr* >( cinfo->dest );
dest->_this->_io_dev.flush();
}
void raise_error()
{
io_error( "Cannot write jpeg file." );
}
static void error_exit( j_common_ptr cinfo )
{
writer< Device, jpeg_tag >* mgr = reinterpret_cast< writer< Device, jpeg_tag >* >( cinfo->client_data );
longjmp( mgr->_mark, 1 );
}
public:
Device _io_dev;
image_write_info< jpeg_tag > _info;
gil_jpeg_destination_mgr _dest;
static const unsigned int buffer_size = 1024;
JOCTET buffer[buffer_size];
};
#if BOOST_WORKAROUND(BOOST_MSVC, >= 1400)
#pragma warning(pop)
#endif
} // namespace gil
} // namespace boost
#endif
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