claw 1.9.0
 
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bitmap_writer.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*/
31
32#include <algorithm>
33
39 : m_image(img)
40{}
41
47claw::graphic::bitmap::writer::writer(const image& img, std::ostream& f)
48 : m_image(img)
49{
50 save(f);
51}
52
57void claw::graphic::bitmap::writer::save(std::ostream& f) const
58{
59 header h;
60
61 init_header(h);
62
63 f.write(reinterpret_cast<char*>(&h), sizeof(header));
64
65 save_data(f);
66}
67
72void claw::graphic::bitmap::writer::save_data(std::ostream& f) const
73{
74 unsigned int line;
75 unsigned int buffer_size = m_image.width() * 3;
76
77 // lines are 4-bytes aligned, so adjust buffer's size.
78 if(buffer_size % 4 != 0)
79 buffer_size += 4 - buffer_size % 4;
80
81 char* buffer = new char[buffer_size];
82
83 for(line = m_image.height(); line > 0;)
84 {
85 --line;
86 pixel32_to_pixel24(buffer, m_image[line]);
87 f.write(buffer, buffer_size);
88 }
89
90 delete[] buffer;
91}
92
98void claw::graphic::bitmap::writer::pixel32_to_pixel24(
99 char* dest, const scanline& src) const
100{
101 unsigned int i24 = 0;
102 scanline::const_iterator first(src.begin());
103 scanline::const_iterator last(src.end());
104
105 for(; first != last; ++first)
106 {
107 dest[i24++] = first->components.blue;
108 dest[i24++] = first->components.green;
109 dest[i24++] = first->components.red;
110 }
111}
112
117void claw::graphic::bitmap::writer::init_header(header& h) const
118{
119 unsigned int adjusted_line = m_image.width() * 3;
120
121 if(m_image.width() % 4 != 0)
122 adjusted_line += 4 - m_image.width() % 4;
123
124 // for a 24 bpp bitmap.
125 h.id[0] = 'B';
126 h.id[1] = 'M';
127 h.file_size = adjusted_line * m_image.height() + sizeof(h);
128 h.nop = 0;
129
130 // there is no color pallet, so data is just after the h
131 h.data_offset = sizeof(h);
132 // default value for Windows' bitmaps.
133 h.header_size = 0x28;
134
135 h.width = m_image.width();
136 h.height = m_image.height();
137 h.layers = 1;
138 h.bpp = 24;
139 h.compression = BMP_COMPRESSION_RGB;
140 h.image_size = adjusted_line * m_image.height();
141 h.ppm_x = 0x2E23; // 11811
142 h.ppm_y = 0x2E23;
143 h.colors_count = 0;
144 h.importants_colors = 0;
145}
A class for bitmap pictures.
Fuction object to get the first element of a std::pair.
writer(const image &img)
Constructor.
void save(std::ostream &f) const
Save the bitmap in a file.
image()
Constructor. Creates an image without datas.
Definition image.cpp:95