void skip_interlaced_rows(reader< istream >& rd, size_t pass_count)
{
typedef std::vector< pixel > row;
typedef row_traits< row > row_traits_type;
row dummy_row(this->get_info().get_width());
for (size_t pass = 1; pass < pass_count; ++pass)
{
rd.read_row(reinterpret_cast< byte* >
(row_traits_type::get_data(dummy_row)));
}
}
void read_rows(reader< istream >& rd, size_t pass_count,
pixcon* pixel_con)
{
for (size_t pass = 0; pass < pass_count; ++pass)
{
pixel_con->reset(pass);
for (size_t pos = 0; pos < this->get_info().get_height(); ++pos)
{
rd.read_row(pixel_con->get_next_row(pos));
}
}
}