226 lines
9.1 KiB
C++
226 lines
9.1 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/warp.hpp>
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#include <mapnik/config.hpp>
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#include <mapnik/image.hpp>
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#include <mapnik/image_scaling_traits.hpp>
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#include <mapnik/image_util.hpp>
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#include <mapnik/box2d.hpp>
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#include <mapnik/view_transform.hpp>
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#include <mapnik/raster.hpp>
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#include <mapnik/proj_transform.hpp>
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// agg
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#include "agg_image_filters.h"
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#include "agg_trans_bilinear.h"
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#include "agg_span_interpolator_linear.h"
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#include "agg_span_image_filter_rgba.h"
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#include "agg_rendering_buffer.h"
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#include "agg_pixfmt_rgba.h"
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#include "agg_rasterizer_scanline_aa.h"
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#include "agg_basics.h"
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#include "agg_scanline_bin.h"
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#include "agg_renderer_scanline.h"
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#include "agg_span_allocator.h"
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#include "agg_image_accessors.h"
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#include "agg_renderer_scanline.h"
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namespace mapnik {
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template <typename T>
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MAPNIK_DECL void warp_image (T & target, T const& source, proj_transform const& prj_trans,
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box2d<double> const& target_ext, box2d<double> const& source_ext,
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double offset_x, double offset_y, unsigned mesh_size, scaling_method_e scaling_method, double filter_factor)
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{
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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 renderer_base = agg::renderer_base<pixfmt_pre>;
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using interpolator_type = typename detail::agg_scaling_traits<image_type>::interpolator_type;
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constexpr std::size_t pixel_size = sizeof(pixel_type);
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view_transform ts(source.width(), source.height(),
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source_ext);
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view_transform tt(target.width(), target.height(),
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target_ext, offset_x, offset_y);
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std::size_t mesh_nx = std::ceil(source.width()/double(mesh_size) + 1);
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std::size_t mesh_ny = std::ceil(source.height()/double(mesh_size) + 1);
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image_gray64f xs(mesh_nx, mesh_ny, false);
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image_gray64f ys(mesh_nx, mesh_ny, false);
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// Precalculate reprojected mesh
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for(std::size_t j = 0; j < mesh_ny; ++j)
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{
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for (std::size_t i=0; i<mesh_nx; ++i)
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{
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xs(i,j) = std::min(i*mesh_size,source.width());
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ys(i,j) = std::min(j*mesh_size,source.height());
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ts.backward(&xs(i,j), &ys(i,j));
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}
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}
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prj_trans.backward(xs.data(), ys.data(), nullptr, mesh_nx*mesh_ny);
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agg::rasterizer_scanline_aa<> rasterizer;
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agg::scanline_bin scanline;
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agg::rendering_buffer buf(target.bytes(),
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target.width(),
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target.height(),
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target.width() * pixel_size);
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pixfmt_pre pixf(buf);
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renderer_base rb(pixf);
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rasterizer.clip_box(0, 0, target.width(), target.height());
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agg::rendering_buffer buf_tile(
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const_cast<unsigned char*>(source.bytes()),
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source.width(),
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source.height(),
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source.width() * pixel_size);
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pixfmt_pre pixf_tile(buf_tile);
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using img_accessor_type = agg::image_accessor_clone<pixfmt_pre>;
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img_accessor_type ia(pixf_tile);
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agg::span_allocator<color_type> sa;
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// Project mesh cells into target interpolating raster inside each one
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for (std::size_t j = 0; j < mesh_ny - 1; ++j)
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{
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for (std::size_t i = 0; i < mesh_nx - 1; ++i)
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{
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double polygon[8] = {xs(i,j), ys(i,j),
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xs(i+1,j), ys(i+1,j),
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xs(i+1,j+1), ys(i+1,j+1),
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xs(i,j+1), ys(i,j+1)};
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tt.forward(polygon+0, polygon+1);
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tt.forward(polygon+2, polygon+3);
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tt.forward(polygon+4, polygon+5);
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tt.forward(polygon+6, polygon+7);
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rasterizer.reset();
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rasterizer.move_to_d(std::floor(polygon[0]), std::floor(polygon[1]));
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rasterizer.line_to_d(std::floor(polygon[2]), std::floor(polygon[3]));
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rasterizer.line_to_d(std::floor(polygon[4]), std::floor(polygon[5]));
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rasterizer.line_to_d(std::floor(polygon[6]), std::floor(polygon[7]));
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std::size_t x0 = i * mesh_size;
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std::size_t y0 = j * mesh_size;
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std::size_t x1 = (i+1) * mesh_size;
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std::size_t y1 = (j+1) * mesh_size;
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x1 = std::min(x1, source.width());
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y1 = std::min(y1, source.height());
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agg::trans_affine tr(polygon, x0, y0, x1, y1);
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if (tr.is_valid())
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{
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interpolator_type interpolator(tr);
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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(ia, interpolator);
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agg::render_scanlines_bin(rasterizer, scanline, rb, 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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span_gen_type sg(ia, interpolator, filter);
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agg::render_scanlines_bin(rasterizer, scanline, rb, sa, sg);
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}
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}
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}
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}
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}
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namespace detail {
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struct warp_image_visitor
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{
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warp_image_visitor (raster & target_raster, proj_transform const& prj_trans, box2d<double> const& source_ext,
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double offset_x, double offset_y, unsigned mesh_size,
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scaling_method_e scaling_method, double filter_factor)
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: target_raster_(target_raster),
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prj_trans_(prj_trans),
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source_ext_(source_ext),
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offset_x_(offset_x),
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offset_y_(offset_y),
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mesh_size_(mesh_size),
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scaling_method_(scaling_method),
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filter_factor_(filter_factor) {}
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void operator() (image_null const&) {}
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template <typename T>
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void operator() (T const& source)
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{
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using image_type = T;
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//source and target image data types must match
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if (target_raster_.data_.template is<image_type>())
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{
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image_type & target = util::get<image_type>(target_raster_.data_);
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warp_image (target, source, prj_trans_, target_raster_.ext_, source_ext_,
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offset_x_, offset_y_, mesh_size_, scaling_method_, filter_factor_);
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}
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}
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raster & target_raster_;
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proj_transform const& prj_trans_;
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box2d<double> const& source_ext_;
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double offset_x_;
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double offset_y_;
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unsigned mesh_size_;
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scaling_method_e scaling_method_;
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double filter_factor_;
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};
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}
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void reproject_and_scale_raster(raster & target, raster const& source,
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proj_transform const& prj_trans,
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double offset_x, double offset_y,
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unsigned mesh_size,
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scaling_method_e scaling_method)
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{
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detail::warp_image_visitor warper(target, prj_trans, source.ext_, offset_x, offset_y, mesh_size,
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scaling_method, source.get_filter_factor());
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util::apply_visitor(warper, source.data_);
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}
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template MAPNIK_DECL void warp_image (image_rgba8&, image_rgba8 const&, proj_transform const&,
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box2d<double> const&, box2d<double> const&, double, double, unsigned, scaling_method_e, double);
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template MAPNIK_DECL void warp_image (image_gray8&, image_gray8 const&, proj_transform const&,
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box2d<double> const&, box2d<double> const&, double, double, unsigned, scaling_method_e, double);
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template MAPNIK_DECL void warp_image (image_gray16&, image_gray16 const&, proj_transform const&,
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box2d<double> const&, box2d<double> const&, double, double, unsigned, scaling_method_e, double);
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template MAPNIK_DECL void warp_image (image_gray32f&, image_gray32f const&, proj_transform const&,
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box2d<double> const&, box2d<double> const&, double, double, unsigned, scaling_method_e, double);
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}// namespace mapnik
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