bitmap_reader.tpp

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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
*/
#include <cassert>
#include <algorithm>
#include <claw/exception.hpp>

/*----------------------------------------------------------------------------*/
template< bool Coded4Bits >
claw::graphic::bitmap::reader::
rle_bitmap_output_buffer<Coded4Bits>::rle_bitmap_output_buffer
( const color_palette_type& palette, image& img )
  : m_palette(palette), m_image(img), m_x(0), m_y(m_image.height() - 1)
{

} // bitmap::reader::rle_bitmap_output_buffer::rle_bitmap_output_buffer()

/*----------------------------------------------------------------------------*/
template< bool Coded4Bits >
void claw::graphic::bitmap::reader::
rle_bitmap_output_buffer<Coded4Bits>::next_line()
{
  assert( m_y > 0 );

  m_x = 0;
  --m_y;
} // bitmap::reader::rle_bitmap_output_buffer::next_line()

/*----------------------------------------------------------------------------*/
template< bool Coded4Bits >
void claw::graphic::bitmap::reader::
rle_bitmap_output_buffer<Coded4Bits>::delta_move
(unsigned char x, unsigned char y)
{
  assert( m_x + x < m_image.width() );
  assert( m_y + y < m_image.height() );

  m_x += x;
  m_y += y;
} // bitmap::reader::rle_bitmap_output_buffer::delta_move()


//******************************************************************************


/*----------------------------------------------------------------------------*/
template< typename OutputBuffer >
void claw::graphic::bitmap::reader::rle_bitmap_decoder<OutputBuffer>::read_mode
( file_input_buffer& input, output_buffer_type& output)
{
  this->m_mode = this->stop;
  bool ok = true;

  if ( input.remaining() < 2)
    ok = input.read_more(2);

  if (ok)
    {
      unsigned char key, pattern;
      
      key = input.get_next();
      pattern = input.get_next();
      
      // compressed data, next byte is the pattern
      if (key > 0)
        {
          this->m_mode = this->compressed;
          this->m_count = key;
          this->m_pattern = pattern;
        }
      else switch( pattern )
        {
          // end of line
        case 0 : output.next_line(); read_mode(input, output); break;
          // end of file
        case 1 : this->m_mode = this->stop; break;
          // delta move
        case 2 :
          {
            if ( input.remaining() < 1 )
              ok = input.read_more(1);

            if (ok)
              {
                unsigned char x, y;
                x = pattern;
                y = input.get_next();
                output.delta_move(x, y);
                read_mode(input, output);
                break;
              }
          }
          // raw data
        default: this->m_mode = this->raw; this->m_count = pattern; break;
        }
    }
} // bitmap::reader::rle_bitmap_decoder::read_mode()


/*----------------------------------------------------------------------------*/
template<typename Convert>
void claw::graphic::bitmap::reader::load_rgb_data
( std::istream& f, unsigned int buffer_size, const color_palette_type& palette,
  const Convert& pixel_convert )
{
  unsigned int line;

  // lines are 4-bytes aligned, so adjust buffer's size.
  if (buffer_size % 4 != 0) 
    buffer_size += 4 - buffer_size % 4;

  char* buffer = new char[buffer_size];

  for (line = m_image.height(); (line>0) && !f.eof(); )
    {
      --line;
      f.read(buffer, buffer_size);
      pixel_convert( m_image[line], buffer, palette );
    }

  delete[] buffer;

  if ( f.rdstate() != std::ios_base::goodbit )
    throw claw::bad_format("bitmap::reader::load_data");
} // bitmap::reader::load_data()