targa_writer.tpp

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00001 /*
00002   CLAW - a C++ Library Absolutely Wonderful
00003 
00004   CLAW is a free library without any particular aim but being useful to 
00005   anyone.
00006 
00007   Copyright (C) 2005-2008 Julien Jorge
00008 
00009   This library is free software; you can redistribute it and/or
00010   modify it under the terms of the GNU Lesser General Public
00011   License as published by the Free Software Foundation; either
00012   version 2.1 of the License, or (at your option) any later version.
00013 
00014   This library is distributed in the hope that it will be useful,
00015   but WITHOUT ANY WARRANTY; without even the implied warranty of
00016   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00017   Lesser General Public License for more details.
00018 
00019   You should have received a copy of the GNU Lesser General Public
00020   License along with this library; if not, write to the Free Software
00021   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
00022 
00023   contact: julien_jorge@yahoo.fr
00024 */
00031 #include <limits>
00032 #include <iterator>
00033 
00034 
00035 //********************* targa::writer::file_output_buffer **********************
00036 
00037 
00038 
00039 
00040   /*----------------------------------------------------------------------------*/
00045 template<typename Pixel>
00046 claw::graphic::targa::writer::file_output_buffer<Pixel>::file_output_buffer
00047 ( std::ostream& os )
00048   : m_stream(os)
00049 {
00050 
00051 } // targa::writer::file_output_buffer::file_output_buffer()
00052 
00053 /*----------------------------------------------------------------------------*/
00059 template<typename Pixel>
00060 void claw::graphic::targa::writer::file_output_buffer<Pixel>::encode
00061 ( unsigned int n, pattern_type pattern )
00062 {
00063   assert( n <= max_encodable() );
00064   assert( n >= min_interesting() );
00065 
00066   unsigned char key = (n-1) | 0x80;
00067 
00068   m_stream << key;
00069   order_pixel_bytes( pattern );
00070 } // targa::writer::file_output_buffer::encode()
00071 
00072 /*----------------------------------------------------------------------------*/
00078 template<typename Pixel>
00079 template<typename Iterator>
00080 void claw::graphic::targa::writer::file_output_buffer<Pixel>::raw
00081 ( Iterator first, Iterator last )
00082 {
00083   unsigned int n = std::distance(first, last);
00084 
00085   unsigned int full = n / max_encodable();
00086   unsigned int remaining = n % max_encodable();
00087 
00088   unsigned char key = max_encodable() - 1;
00089 
00090   for (unsigned int i=0; i!=full; ++i)
00091     {
00092       m_stream << key;
00093 
00094       for (unsigned int j=0; j!=max_encodable(); ++j, ++first)
00095         order_pixel_bytes( *first );
00096     }
00097 
00098   if (remaining)
00099     {
00100       key = remaining - 1;
00101       m_stream << key;
00102       
00103       for (unsigned int j=0; j!=remaining; ++j, ++first)
00104         order_pixel_bytes( *first );
00105     }
00106 
00107 } // targa::writer::file_output_buffer::raw()
00108 
00109 /*----------------------------------------------------------------------------*/
00113 template<typename Pixel>
00114 unsigned int
00115 claw::graphic::targa::writer::file_output_buffer<Pixel>::min_interesting() const
00116 {
00117   return 2;
00118 } // targa::writer::file_output_buffer::min_interesting()
00119 
00120 /*----------------------------------------------------------------------------*/
00124 template<typename Pixel>
00125 unsigned int
00126 claw::graphic::targa::writer::file_output_buffer<Pixel>::max_encodable() const
00127 {
00128   return 0x80;
00129 } // targa::writer::file_output_buffer::max_encodable()

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