targa_writer.cpp

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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@stuff-o-matic.com
*/
#include <claw/graphic/targa.hpp>
 
#include <claw/exception.hpp>
 
//********************** targa::writer::file_output_buffer
//*********************
 
namespace claw
{
  namespace graphic
  {
    template <>
    void targa::writer::file_output_buffer<
        claw::graphic::rgba_pixel_8>::order_pixel_bytes(const pixel_type& p)
    {
      m_stream << p.components.blue << p.components.green << p.components.red
               << p.components.alpha;
    }
  }
}
 
//************************** targa::writer::writer
//*****************************

claw::graphic::targa::writer::writer(const image& img)
  : m_image(img)
{}

claw::graphic::targa::writer::writer(const image& img, std::ostream& f,
                                     bool rle)
  : m_image(img)
{
  save(f, rle);
}

void claw::graphic::targa::writer::save(std::ostream& os, bool rle) const
{
  header h(m_image.width(), m_image.height());
 
  if(rle)
    h.image_type = rle_true_color;
  else
    h.image_type = true_color;
 
  os.write(reinterpret_cast<char*>(&h), sizeof(header));
 
  if(rle)
    save_rle_true_color(os);
  else
    save_true_color(os);
 
  footer f;
  os.write(reinterpret_cast<char*>(&f), sizeof(footer));
}

void claw::graphic::targa::writer::save_true_color(std::ostream& os) const
{
  file_output_buffer<rgba_pixel_8> output_buffer(os);
 
  for(const_iterator it = m_image.begin(); it != m_image.end(); ++it)
    output_buffer.order_pixel_bytes(*it);
}

void claw::graphic::targa::writer::save_rle_true_color(std::ostream& os) const
{
  rle32_encoder encoder;
  rle32_encoder::output_buffer_type output_buffer(os);
 
  for(unsigned int y = 0; y != m_image.height(); ++y)
    encoder.encode(m_image[y].begin(), m_image[y].end(), output_buffer);
}