202 lines
8.7 KiB
C++
202 lines
8.7 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) 2015 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.hpp>
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#include <mapnik/image_scaling.hpp>
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#include <mapnik/image_scaling_traits.hpp>
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#pragma GCC diagnostic push
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#include <mapnik/warning_ignore.hpp>
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#include <boost/assign/list_of.hpp>
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#include <boost/bimap.hpp>
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#pragma GCC diagnostic pop
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#pragma GCC diagnostic push
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#include <mapnik/warning_ignore_agg.hpp>
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#include "agg_image_accessors.h"
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#include "agg_pixfmt_rgba.h"
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#include "agg_pixfmt_gray.h"
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#include "agg_color_rgba.h"
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#include "agg_rasterizer_scanline_aa.h"
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#include "agg_renderer_scanline.h"
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#include "agg_rendering_buffer.h"
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#include "agg_scanline_u.h"
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#include "agg_span_allocator.h"
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#include "agg_span_image_filter_gray.h"
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#include "agg_span_image_filter_rgba.h"
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#include "agg_span_interpolator_linear.h"
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#include "agg_trans_affine.h"
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#include "agg_image_filters.h"
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#pragma GCC diagnostic pop
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namespace mapnik
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{
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using scaling_method_lookup_type = boost::bimap<scaling_method_e, std::string>;
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static const scaling_method_lookup_type scaling_lookup = boost::assign::list_of<scaling_method_lookup_type::relation>
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(SCALING_NEAR,"near")
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(SCALING_BILINEAR,"bilinear")
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(SCALING_BICUBIC,"bicubic")
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(SCALING_SPLINE16,"spline16")
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(SCALING_SPLINE36,"spline36")
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(SCALING_HANNING,"hanning")
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(SCALING_HAMMING,"hamming")
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(SCALING_HERMITE,"hermite")
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(SCALING_KAISER,"kaiser")
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(SCALING_QUADRIC,"quadric")
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(SCALING_CATROM,"catrom")
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(SCALING_GAUSSIAN,"gaussian")
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(SCALING_BESSEL,"bessel")
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(SCALING_MITCHELL,"mitchell")
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(SCALING_SINC,"sinc")
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(SCALING_LANCZOS,"lanczos")
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(SCALING_BLACKMAN,"blackman")
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;
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boost::optional<scaling_method_e> scaling_method_from_string(std::string const& name)
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{
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boost::optional<scaling_method_e> mode;
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scaling_method_lookup_type::right_const_iterator right_iter = scaling_lookup.right.find(name);
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if (right_iter != scaling_lookup.right.end())
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{
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mode.reset(right_iter->second);
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}
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return mode;
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}
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boost::optional<std::string> scaling_method_to_string(scaling_method_e scaling_method)
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{
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boost::optional<std::string> mode;
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scaling_method_lookup_type::left_const_iterator left_iter = scaling_lookup.left.find(scaling_method);
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if (left_iter != scaling_lookup.left.end())
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{
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mode.reset(left_iter->second);
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}
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return mode;
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}
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template <typename T>
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void scale_image_agg(T & target, T const& source, scaling_method_e scaling_method,
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double image_ratio_x, double image_ratio_y, double x_off_f, double y_off_f,
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double filter_factor, boost::optional<double> const & nodata_value)
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{
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// "the image filters should work namely in the premultiplied color space"
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// http://old.nabble.com/Re:--AGG--Basic-image-transformations-p1110665.html
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// "Yes, you need to use premultiplied images only. Only in this case the simple weighted averaging works correctly in the image fitering."
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// http://permalink.gmane.org/gmane.comp.graphics.agg/3443
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using image_type = T;
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using pixel_type = typename image_type::pixel_type;
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using pixfmt_pre = typename detail::agg_scaling_traits<image_type>::pixfmt_pre;
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using color_type = typename detail::agg_scaling_traits<image_type>::color_type;
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using img_src_type = typename detail::agg_scaling_traits<image_type>::img_src_type;
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using interpolator_type = typename detail::agg_scaling_traits<image_type>::interpolator_type;
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using renderer_base_pre = agg::renderer_base<pixfmt_pre>;
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constexpr std::size_t pixel_size = sizeof(pixel_type);
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// define some stuff we'll use soon
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agg::rasterizer_scanline_aa<> ras;
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agg::scanline_u8 sl;
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agg::span_allocator<color_type> sa;
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// initialize source AGG buffer
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agg::rendering_buffer rbuf_src(const_cast<unsigned char*>(source.bytes()),
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source.width(), source.height(), source.width() * pixel_size);
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pixfmt_pre pixf_src(rbuf_src);
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img_src_type img_src(pixf_src);
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// initialize destination AGG buffer (with transparency)
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agg::rendering_buffer rbuf_dst(target.bytes(), target.width(), target.height(), target.width() * pixel_size);
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pixfmt_pre pixf_dst(rbuf_dst);
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renderer_base_pre rb_dst_pre(pixf_dst);
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// create a scaling matrix
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agg::trans_affine img_mtx;
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img_mtx /= agg::trans_affine_scaling(image_ratio_x, image_ratio_y);
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// create a linear interpolator for our scaling matrix
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interpolator_type interpolator(img_mtx);
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// draw an anticlockwise polygon to render our image into
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double scaled_width = target.width();
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double scaled_height = target.height();
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ras.reset();
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ras.move_to_d(x_off_f, y_off_f);
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ras.line_to_d(x_off_f + scaled_width, y_off_f);
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ras.line_to_d(x_off_f + scaled_width, y_off_f + scaled_height);
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ras.line_to_d(x_off_f, y_off_f + scaled_height);
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if (scaling_method == SCALING_NEAR)
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{
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using span_gen_type = typename detail::agg_scaling_traits<image_type>::span_image_filter;
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span_gen_type sg(img_src, interpolator);
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agg::render_scanlines_aa(ras, sl, rb_dst_pre, sa, sg);
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}
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else
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{
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using span_gen_type = typename detail::agg_scaling_traits<image_type>::span_image_resample_affine;
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agg::image_filter_lut filter;
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detail::set_scaling_method(filter, scaling_method, filter_factor);
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boost::optional<typename span_gen_type::value_type> nodata;
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if (nodata_value)
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{
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nodata = nodata_value;
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}
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span_gen_type sg(img_src, interpolator, filter, nodata);
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agg::render_scanlines_aa(ras, sl, rb_dst_pre, sa, sg);
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}
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}
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template MAPNIK_DECL void scale_image_agg(image_rgba8 &, image_rgba8 const&, scaling_method_e,
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double, double , double, double , double, boost::optional<double> const &);
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template MAPNIK_DECL void scale_image_agg(image_gray8 &, image_gray8 const&, scaling_method_e,
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double, double , double, double , double, boost::optional<double> const &);
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template MAPNIK_DECL void scale_image_agg(image_gray8s &, image_gray8s const&, scaling_method_e,
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double, double , double, double , double, boost::optional<double> const &);
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template MAPNIK_DECL void scale_image_agg(image_gray16 &, image_gray16 const&, scaling_method_e,
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double, double , double, double , double, boost::optional<double> const &);
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template MAPNIK_DECL void scale_image_agg(image_gray16s &, image_gray16s const&, scaling_method_e,
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double, double , double, double , double, boost::optional<double> const &);
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template MAPNIK_DECL void scale_image_agg(image_gray32 &, image_gray32 const&, scaling_method_e,
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double, double , double, double , double, boost::optional<double> const &);
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template MAPNIK_DECL void scale_image_agg(image_gray32s &, image_gray32s const&, scaling_method_e,
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double, double , double, double , double, boost::optional<double> const &);
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template MAPNIK_DECL void scale_image_agg(image_gray32f &, image_gray32f const&, scaling_method_e,
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double, double , double, double , double, boost::optional<double> const &);
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template MAPNIK_DECL void scale_image_agg(image_gray64 &, image_gray64 const&, scaling_method_e,
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double, double , double, double , double, boost::optional<double> const &);
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template MAPNIK_DECL void scale_image_agg(image_gray64s &, image_gray64s const&, scaling_method_e,
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double, double , double, double , double, boost::optional<double> const &);
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template MAPNIK_DECL void scale_image_agg(image_gray64f &, image_gray64f const&, scaling_method_e,
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double, double , double, double , double, boost::optional<double> const &);
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}
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