claw  1.9.0
targa_file_structure.cpp
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1 /*
2  CLAW - a C++ Library Absolutely Wonderful
3 
4  CLAW is a free library without any particular aim but being useful to
5  anyone.
6 
7  Copyright (C) 2005-2011 Julien Jorge
8 
9  This library is free software; you can redistribute it and/or
10  modify it under the terms of the GNU Lesser General Public
11  License as published by the Free Software Foundation; either
12  version 2.1 of the License, or (at your option) any later version.
13 
14  This library is distributed in the hope that it will be useful,
15  but WITHOUT ANY WARRANTY; without even the implied warranty of
16  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17  Lesser General Public License for more details.
18 
19  You should have received a copy of the GNU Lesser General Public
20  License along with this library; if not, write to the Free Software
21  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
22 
23  contact: julien.jorge@stuff-o-matic.com
24 */
30 #include <claw/graphic/targa.hpp>
31 
32 //************************ targa::file_structure::header
33 //***********************
34 
39 {}
40 
47  unsigned int h)
48 {
49  id_length = 0;
50  color_map = 0;
51 
52  image_type = true_color;
53 
54  color_map_specification.first_entry_index = 0;
55  color_map_specification.length = 0;
56  color_map_specification.entry_size = 0;
57 
58  image_specification.x_origin = 0;
59  image_specification.y_origin = 0;
60  image_specification.width = w;
61  image_specification.height = h;
62 
63  image_specification.bpp = 32; // pixel32
64 
65  image_specification.descriptor = 8; // unsigned char
66  image_specification.descriptor |= 0x20; // origin is top-left
67 }
68 
69 //************** targa::file_structure::header::specification
70 //******************
71 
77 {
78  return descriptor & 0x20;
79 }
80 
86 {
87  return !(descriptor & 0x10);
88 }
89 
93 unsigned char
95 {
96  return descriptor & 0x0F;
97 }
98 
99 //********************* targa::file_structure::footer
100 //**************************
101 
102 const std::string claw::graphic::targa::file_structure::footer::s_signature(
103  "TRUEVISION-XFILE.");
104 
109  : extension_offset(0)
110  , developer_offset(0)
111 {
112  std::copy(s_signature.begin(), s_signature.end(), signature);
113  signature[s_signature.length()] = '\0';
114 }
115 
120 {
121  return std::equal(s_signature.begin(), s_signature.end(), signature)
122  && signature[s_signature.length()] == '\0';
123 }
char signature[18]
Footer identier. Must be as long as std::string("TRUEVISION-XFILE.") + 1 (for the last &#39;\0&#39;)...
Definition: targa.hpp:165
bool is_valid() const
Tell if the data of this footer is valid.
unsigned char alpha() const
Number of bits per pixel assigned to alpha chanel.
A class for targa pictures.
bool up_down_oriented() const
Is image stored up to down ?
bool left_right_oriented() const
Is image stored left to right ?