targa_file_structure.cpp

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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 */
00030 #include <claw/targa.hpp>
00031 
00032 
00033 //************************ targa::file_structure::header ***********************
00034 
00035 
00036 
00037 /*----------------------------------------------------------------------------*/
00041 claw::graphic::targa::file_structure::header::header()
00042 {
00043 
00044 } // targa::file_structure::header::header()
00045 
00046 /*----------------------------------------------------------------------------*/
00052 claw::graphic::targa::file_structure::header::header
00053 ( unsigned int w, unsigned int h )
00054 {
00055   id_length = 0;
00056   color_map = 0;
00057 
00058   image_type = true_color;
00059 
00060   color_map_specification.first_entry_index = 0;
00061   color_map_specification.length = 0;
00062   color_map_specification.entry_size = 0;
00063 
00064   image_specification.x_origin = 0;
00065   image_specification.y_origin = 0;
00066   image_specification.width = w;
00067   image_specification.height = h;
00068 
00069   image_specification.bpp = 32; // pixel32
00070 
00071   image_specification.descriptor = 8; // unsigned char
00072   image_specification.descriptor |= 0x20; // origin is top-left
00073 } // targa::file_structure::header::header()
00074 
00075 
00076 
00077 
00078 //************** targa::file_structure::header::specification ******************
00079 
00080 
00081 
00082 
00083 /*----------------------------------------------------------------------------*/
00087 bool
00088 claw::graphic::targa::file_structure::header::specification::
00089 up_down_oriented() const
00090 {
00091   return descriptor & 0x20;
00092 } // targa::file_structure::header::specification::up_down_oriented()
00093 
00094 /*----------------------------------------------------------------------------*/
00098 bool
00099 claw::graphic::targa::file_structure::header::specification::
00100 left_right_oriented() const
00101 {
00102   return !(descriptor & 0x10);
00103 } // targa::file_structure::header::specification::left_right_oriented()
00104 
00105 /*----------------------------------------------------------------------------*/
00109 unsigned char
00110 claw::graphic::targa::file_structure::header::specification::alpha() const
00111 {
00112   return descriptor & 0x0F;
00113 } // targa::file_structure::header::specification::alpha()
00114 
00115 
00116 
00117 
00118 //********************* targa::file_structure::footer **************************
00119 
00120 
00121 
00122 
00123 /*----------------------------------------------------------------------------*/
00124 const std::string
00125 claw::graphic::targa::file_structure::footer::s_signature("TRUEVISION-XFILE.");
00126 
00127 /*----------------------------------------------------------------------------*/
00131 claw::graphic::targa::file_structure::footer::footer()
00132   : extension_offset(0), developer_offset(0)
00133 {
00134   std::copy( s_signature.begin(), s_signature.end(), signature );
00135   signature[s_signature.length()] = '\0';
00136 } // targa::file_structure::footer::footer()
00137 
00138 /*----------------------------------------------------------------------------*/
00142 bool claw::graphic::targa::file_structure::footer::is_valid() const
00143 {
00144   return std::equal( s_signature.begin(), s_signature.end(), signature )
00145     && signature[s_signature.length()] == '\0';
00146 } // targa::file_structure::footer::is_valid()

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