void write_half_exr( const boost::filesystem::path& p, Imf::Header& header,
const image::const_image_view_t& view, bool write_alpha)
{
boost::gil::rgba16f_image_t img( view.width(), view.height());
boost::gil::copy_and_convert_pixels( view, boost::gil::view( img));
header.channels().insert( "R", Imf::HALF);
header.channels().insert( "G", Imf::HALF);
header.channels().insert( "B", Imf::HALF);
if( write_alpha)
header.channels().insert( "A", Imf::HALF);
Imf::FrameBuffer frameBuffer;
char *ptr = (char *) boost::gil::interleaved_view_get_raw_data( boost::gil::view( img));
std::size_t xstride = 4 * sizeof(half);
std::size_t ystride = xstride * img.width();
frameBuffer.insert( "R", Imf::Slice( Imf::HALF, ptr, xstride, ystride)); ptr += sizeof(half);
frameBuffer.insert( "G", Imf::Slice( Imf::HALF, ptr, xstride, ystride)); ptr += sizeof(half);
frameBuffer.insert( "B", Imf::Slice( Imf::HALF, ptr, xstride, ystride)); ptr += sizeof(half);
if( write_alpha)
frameBuffer.insert( "A", Imf::Slice( Imf::HALF, ptr, xstride, ystride));
Imf::OutputFile out_file( p.external_file_string().c_str(), header);
out_file.setFrameBuffer( frameBuffer);
out_file.writePixels( img.height());
}
boost::filesystem::path readlink(const boost::filesystem::path&
#ifndef BOOST_WINDOWS_API
path
#endif
)
{
#ifdef BOOST_WINDOWS_API
throw std::runtime_error("readlink() not implemented on Windows");
#else
string link(path.external_file_string());
vector<char> buf(512);
for (;;)
{
const ssize_t len = readlink(link.c_str(), &buf[0], buf.size());
if (len == -1)
{
if (errno == ENAMETOOLONG)
{
buf.resize(2 * buf.size());
continue;
}
throw system_error(error_code(errno, get_system_category()));
}
return path.parent_path() / string(&buf[0], len);
}
#endif
}
static void stream_do_open(Fstream& s,
const fs::path& path,
const std::ios_base::openmode mode,
typename boost::enable_if<is_std_fstream<Fstream> >::type* = 0)
{
string file(path.external_file_string());
s.open(file.c_str(), mode);
}
void png_writer_t::do_write_image( const boost::filesystem::path& p,
const image::const_image_view_t& view,
const adobe::dictionary_t& params) const
{
int channels = adobe::get_value( params, adobe::name_t( "channels")).cast<int>();
std::auto_ptr<OpenImageIO::ImageOutput> out( OpenImageIO::ImageOutput::create( p.external_file_string()));
if( !out.get())
throw std::runtime_error( "Write PNG: Can't open output file");
if( channels)
channels = 3;
else
channels = 4;
OpenImageIO::ImageSpec spec( view.width(), view.height(), channels, TypeDesc::UINT8);
spec.quant_dither = 0.0f;
if( !out->open( p.external_file_string(), spec))
throw( std::runtime_error( "Can't open output file"));
std::vector<image::pixel_t> scanline( view.width());
for( int y = 0; y < view.height(); ++y)
{
std::copy( view.row_begin( y), view.row_end( y), scanline.begin());
apply_gamma( 1.0f / 2.2f, scanline.begin(), scanline.end());
clamp( scanline.begin(), scanline.end());
if( !out->write_scanline( y, 0, TypeDesc::FLOAT, (void *) &( *scanline.begin()), sizeof( image::pixel_t)))
throw( std::runtime_error( "Write image: Can't write pixels"));
}
if( !out->close())
throw std::runtime_error( "Write image: Can't close file");
}