361 lines
11 KiB
C++
361 lines
11 KiB
C++
/*****************************************************************************
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*
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* This file is part of Mapnik (c++ mapping toolkit)
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*
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* Copyright (C) 2014 Artem Pavlenko
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*****************************************************************************/
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// mapnik
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#include <mapnik/image_copy.hpp>
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#include <mapnik/image.hpp>
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#include <mapnik/image_any.hpp>
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// boost
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#include <boost/numeric/conversion/cast.hpp>
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using boost::numeric_cast;
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using boost::numeric::positive_overflow;
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using boost::numeric::negative_overflow;
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namespace mapnik
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{
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namespace detail
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{
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template <typename T0>
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struct visitor_image_copy
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{
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using dst_type = typename T0::pixel_type;
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T0 operator() (image_null const&)
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{
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throw std::runtime_error("Can not cast a null image");
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}
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T0 operator() (T0 const& src)
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{
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return T0(src);
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}
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template <typename T1>
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T0 operator() (T1 const& src)
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{
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T0 dst(src.width(), src.height(), false);
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for (unsigned y = 0; y < dst.height(); ++y)
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{
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for (unsigned x = 0; x < dst.width(); ++x)
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{
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try
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{
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dst(x,y) = numeric_cast<dst_type>(src(x,y));
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}
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catch(negative_overflow&)
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{
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dst(x,y) = std::numeric_limits<dst_type>::min();
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}
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catch(positive_overflow&)
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{
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dst(x,y) = std::numeric_limits<dst_type>::max();
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}
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}
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}
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return T0(std::move(dst));
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}
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};
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template <typename T0>
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struct visitor_image_copy_so
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{
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using dst_type = typename T0::pixel_type;
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visitor_image_copy_so(double offset, double scaling)
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: offset_(offset), scaling_(scaling) {}
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T0 operator() (image_null const&)
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{
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throw std::runtime_error("Can not cast a null image");
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}
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T0 operator() (T0 const& src)
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{
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if (offset_ == src.get_offset() && scaling_ == src.get_scaling())
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{
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return T0(src);
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}
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else
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{
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T0 dst(src);
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dst.set_scaling(scaling_);
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dst.set_offset(offset_);
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return T0(std::move(dst));
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}
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}
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template <typename T1>
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T0 operator() (T1 const& src)
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{
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double src_offset = src.get_offset();
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double src_scaling = src.get_scaling();
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T0 dst(src.width(), src.height(), false);
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dst.set_scaling(scaling_);
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dst.set_offset(offset_);
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for (unsigned y = 0; y < dst.height(); ++y)
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{
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for (unsigned x = 0; x < dst.width(); ++x)
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{
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double scaled_src_val = (numeric_cast<double>(src(x,y)) * src_scaling) + src_offset;
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double dst_val = (scaled_src_val - offset_) / scaling_;
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try
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{
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dst(x,y) = numeric_cast<dst_type>(dst_val);
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}
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catch(negative_overflow&)
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{
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dst(x,y) = std::numeric_limits<dst_type>::min();
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}
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catch(positive_overflow&)
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{
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dst(x,y) = std::numeric_limits<dst_type>::max();
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}
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}
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}
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return T0(std::move(dst));
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}
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private:
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double offset_;
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double scaling_;
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};
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} // end detail ns
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template <typename T>
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MAPNIK_DECL T image_copy(image_any const& data, double offset, double scaling)
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{
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if (offset == 0.0 && scaling == 1.0 && data.get_offset() == 0.0 && data.get_scaling() == 1.0)
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{
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return util::apply_visitor(detail::visitor_image_copy<T>(), data);
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}
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else
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{
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return util::apply_visitor(detail::visitor_image_copy_so<T>(offset, scaling), data);
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}
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}
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template <typename T>
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MAPNIK_DECL T image_copy(image_rgba8 const& data, double offset, double scaling)
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{
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if (offset == 0.0 && scaling == 1.0 && data.get_offset() == 0.0 && data.get_scaling() == 1.0)
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{
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detail::visitor_image_copy<T> visit;
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return visit(data);
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}
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else
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{
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detail::visitor_image_copy_so<T> visit(offset, scaling);
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return visit(data);
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}
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}
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template <typename T>
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MAPNIK_DECL T image_copy(image_gray8 const& data, double offset, double scaling)
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{
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if (offset == 0.0 && scaling == 1.0 && data.get_offset() == 0.0 && data.get_scaling() == 1.0)
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{
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detail::visitor_image_copy<T> visit;
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return visit(data);
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}
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else
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{
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detail::visitor_image_copy_so<T> visit(offset, scaling);
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return visit(data);
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}
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}
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template <typename T>
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MAPNIK_DECL T image_copy(image_gray8s const& data, double offset, double scaling)
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{
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if (offset == 0.0 && scaling == 1.0 && data.get_offset() == 0.0 && data.get_scaling() == 1.0)
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{
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detail::visitor_image_copy<T> visit;
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return visit(data);
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}
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else
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{
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detail::visitor_image_copy_so<T> visit(offset, scaling);
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return visit(data);
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}
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}
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template <typename T>
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MAPNIK_DECL T image_copy(image_gray16 const& data, double offset, double scaling)
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{
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if (offset == 0.0 && scaling == 1.0 && data.get_offset() == 0.0 && data.get_scaling() == 1.0)
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{
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detail::visitor_image_copy<T> visit;
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return visit(data);
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}
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else
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{
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detail::visitor_image_copy_so<T> visit(offset, scaling);
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return visit(data);
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}
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}
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template <typename T>
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MAPNIK_DECL T image_copy(image_gray16s const& data, double offset, double scaling)
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{
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if (offset == 0.0 && scaling == 1.0 && data.get_offset() == 0.0 && data.get_scaling() == 1.0)
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{
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detail::visitor_image_copy<T> visit;
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return visit(data);
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}
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else
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{
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detail::visitor_image_copy_so<T> visit(offset, scaling);
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return visit(data);
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}
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}
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template <typename T>
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MAPNIK_DECL T image_copy(image_gray32 const& data, double offset, double scaling)
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{
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if (offset == 0.0 && scaling == 1.0 && data.get_offset() == 0.0 && data.get_scaling() == 1.0)
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{
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detail::visitor_image_copy<T> visit;
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return visit(data);
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}
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else
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{
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detail::visitor_image_copy_so<T> visit(offset, scaling);
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return visit(data);
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}
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}
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template <typename T>
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MAPNIK_DECL T image_copy(image_gray32s const& data, double offset, double scaling)
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{
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if (offset == 0.0 && scaling == 1.0 && data.get_offset() == 0.0 && data.get_scaling() == 1.0)
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{
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detail::visitor_image_copy<T> visit;
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return visit(data);
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}
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else
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{
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detail::visitor_image_copy_so<T> visit(offset, scaling);
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return visit(data);
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}
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}
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template <typename T>
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MAPNIK_DECL T image_copy(image_gray32f const& data, double offset, double scaling)
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{
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if (offset == 0.0 && scaling == 1.0 && data.get_offset() == 0.0 && data.get_scaling() == 1.0)
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{
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detail::visitor_image_copy<T> visit;
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return visit(data);
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}
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else
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{
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detail::visitor_image_copy_so<T> visit(offset, scaling);
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return visit(data);
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}
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}
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template <typename T>
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MAPNIK_DECL T image_copy(image_gray64 const& data, double offset, double scaling)
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{
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if (offset == 0.0 && scaling == 1.0 && data.get_offset() == 0.0 && data.get_scaling() == 1.0)
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{
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detail::visitor_image_copy<T> visit;
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return visit(data);
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}
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else
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{
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detail::visitor_image_copy_so<T> visit(offset, scaling);
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return visit(data);
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}
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}
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template <typename T>
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MAPNIK_DECL T image_copy(image_gray64s const& data, double offset, double scaling)
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{
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if (offset == 0.0 && scaling == 1.0 && data.get_offset() == 0.0 && data.get_scaling() == 1.0)
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{
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detail::visitor_image_copy<T> visit;
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return visit(data);
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}
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else
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{
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detail::visitor_image_copy_so<T> visit(offset, scaling);
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return visit(data);
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}
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}
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template <typename T>
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MAPNIK_DECL T image_copy(image_gray64f const& data, double offset, double scaling)
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{
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if (offset == 0.0 && scaling == 1.0 && data.get_offset() == 0.0 && data.get_scaling() == 1.0)
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{
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detail::visitor_image_copy<T> visit;
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return visit(data);
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}
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else
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{
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detail::visitor_image_copy_so<T> visit(offset, scaling);
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return visit(data);
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}
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}
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MAPNIK_DECL image_any image_copy(image_any const& data, image_dtype type, double offset, double scaling)
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{
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switch (type)
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{
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case image_dtype_rgba8:
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return image_any(std::move(image_copy<image_rgba8>(data, offset, scaling)));
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case image_dtype_gray8:
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return image_any(std::move(image_copy<image_gray8>(data, offset, scaling)));
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case image_dtype_gray8s:
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return image_any(std::move(image_copy<image_gray8s>(data, offset, scaling)));
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case image_dtype_gray16:
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return image_any(std::move(image_copy<image_gray16>(data, offset, scaling)));
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case image_dtype_gray16s:
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return image_any(std::move(image_copy<image_gray16s>(data, offset, scaling)));
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case image_dtype_gray32:
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return image_any(std::move(image_copy<image_gray32>(data, offset, scaling)));
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case image_dtype_gray32s:
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return image_any(std::move(image_copy<image_gray32s>(data, offset, scaling)));
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case image_dtype_gray32f:
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return image_any(std::move(image_copy<image_gray32f>(data, offset, scaling)));
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case image_dtype_gray64:
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return image_any(std::move(image_copy<image_gray64>(data, offset, scaling)));
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case image_dtype_gray64s:
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return image_any(std::move(image_copy<image_gray64s>(data, offset, scaling)));
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case image_dtype_gray64f:
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return image_any(std::move(image_copy<image_gray64f>(data, offset, scaling)));
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case image_dtype_null:
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throw std::runtime_error("Can not cast a null image");
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case IMAGE_DTYPE_MAX:
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default:
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throw std::runtime_error("Can not cast unknown type");
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}
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throw std::runtime_error("Unknown image type passed");
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}
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} // end mapnik ns
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