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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
*/
/**
* \file bitmap_writer.cpp
* \brief Implementation of the claw::graphic::bitmap::writer class.
* \author Julien Jorge
*/
#include <claw/bitmap.hpp>
#include <algorithm>
/*----------------------------------------------------------------------------*/
/**
* \brief Constructor.
* \param img The image to save.
*/
claw::graphic::bitmap::writer::writer( const image& img )
: m_image(img)
{
} // bitmap::writer::writer()
/*----------------------------------------------------------------------------*/
/**
* \brief Constructor.
* \param img The image to save.
* \param f The file in which we save the data.
*/
claw::graphic::bitmap::writer::writer( const image& img, std::ostream& f )
: m_image(img)
{
save(f);
} // bitmap::writer::writer()
/*----------------------------------------------------------------------------*/
/**
* \brief Save the bitmap in a file.
* \param f Destination file.
*/
void claw::graphic::bitmap::writer::save( std::ostream& f ) const
{
header h;
init_header(h);
f.write( reinterpret_cast<char*>(&h), sizeof(header) );
save_data( f );
} // bitmap::writer::save()
/*----------------------------------------------------------------------------*/
/**
* \brief Saves a 24 bpp bitmap file.
* \param f Bitmap file.
*/
void claw::graphic::bitmap::writer::save_data( std::ostream& f ) const
{
unsigned int line;
unsigned int buffer_size = m_image.width() * 3;
// lines are 4-bytes aligned, so adjust buffer's size.
if (buffer_size % 4 != 0)
buffer_size += 4 - buffer_size % 4;
char* buffer = new char[buffer_size];
for (line = m_image.height(); line>0; )
{
--line;
pixel32_to_pixel24( buffer, m_image[line] );
f.write(buffer, buffer_size);
}
delete[] buffer;
} // bitmap::writer::save_data()
/*----------------------------------------------------------------------------*/
/**
* \brief Converts a pixel32 scanline to a BGR array.
* \param dest (out) Filled array.
* \param src Scanline to convert.
*/
void claw::graphic::bitmap::writer::pixel32_to_pixel24
( char* dest, const scanline& src ) const
{
unsigned int i24 = 0;
scanline::const_iterator first( src.begin() );
scanline::const_iterator last( src.end() );
for ( ; first!=last; ++first )
{
dest[i24++] = first->components.blue;
dest[i24++] = first->components.green;
dest[i24++] = first->components.red;
}
} // bitmap::writer::pixel32_to_pixel24()
/*----------------------------------------------------------------------------*/
/**
* \brief Initialize header's data, for saving.
* \param h Header to initialize.
*/
void claw::graphic::bitmap::writer::init_header( header& h ) const
{
unsigned int adjusted_line = m_image.width() * 3;
if (m_image.width() % 4 != 0)
adjusted_line += 4 - m_image.width() % 4;
// for a 24 bpp bitmap.
h.id[0] = 'B';
h.id[1] = 'M';
h.file_size = adjusted_line * m_image.height() + sizeof(h);
h.nop = 0;
// there is no color pallet, so data is just after the h
h.data_offset = sizeof(h);
// default value for Windows' bitmaps.
h.header_size = 0x28;
h.width = m_image.width();
h.height = m_image.height();
h.layers = 1;
h.bpp = 24;
h.compression = BMP_COMPRESSION_RGB;
h.image_size = adjusted_line * m_image.height();
h.ppm_x = 0x2E23; // 11811
h.ppm_y = 0x2E23;
h.colors_count = 0;
h.importants_colors = 0;
} // bitmap::writer::init_header()
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