targa_file_structure.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@gamned.org
*/
#include <claw/targa.hpp>
 
 
//************************ targa::file_structure::header ***********************
 
 
 
/*----------------------------------------------------------------------------*/
claw::graphic::targa::file_structure::header::header()
{
 
} // targa::file_structure::header::header()
 
/*----------------------------------------------------------------------------*/
claw::graphic::targa::file_structure::header::header
( unsigned int w, unsigned int h )
{
  id_length = 0;
  color_map = 0;
 
  image_type = true_color;
 
  color_map_specification.first_entry_index = 0;
  color_map_specification.length = 0;
  color_map_specification.entry_size = 0;
 
  image_specification.x_origin = 0;
  image_specification.y_origin = 0;
  image_specification.width = w;
  image_specification.height = h;
 
  image_specification.bpp = 32; // pixel32
 
  image_specification.descriptor = 8; // unsigned char
  image_specification.descriptor |= 0x20; // origin is top-left
} // targa::file_structure::header::header()
 
 
 
 
//************** targa::file_structure::header::specification ******************
 
 
 
 
/*----------------------------------------------------------------------------*/
bool
claw::graphic::targa::file_structure::header::specification::
up_down_oriented() const
{
  return descriptor & 0x20;
} // targa::file_structure::header::specification::up_down_oriented()
 
/*----------------------------------------------------------------------------*/
bool
claw::graphic::targa::file_structure::header::specification::
left_right_oriented() const
{
  return !(descriptor & 0x10);
} // targa::file_structure::header::specification::left_right_oriented()
 
/*----------------------------------------------------------------------------*/
unsigned char
claw::graphic::targa::file_structure::header::specification::alpha() const
{
  return descriptor & 0x0F;
} // targa::file_structure::header::specification::alpha()
 
 
 
 
//********************* targa::file_structure::footer **************************
 
 
 
 
/*----------------------------------------------------------------------------*/
const std::string
claw::graphic::targa::file_structure::footer::s_signature("TRUEVISION-XFILE.");
 
/*----------------------------------------------------------------------------*/
claw::graphic::targa::file_structure::footer::footer()
  : extension_offset(0), developer_offset(0)
{
  std::copy( s_signature.begin(), s_signature.end(), signature );
  signature[s_signature.length()] = '\0';
} // targa::file_structure::footer::footer()
 
/*----------------------------------------------------------------------------*/
bool claw::graphic::targa::file_structure::footer::is_valid() const
{
  return std::equal( s_signature.begin(), s_signature.end(), signature )
    && signature[s_signature.length()] == '\0';
} // targa::file_structure::footer::is_valid()