199 lines
7.8 KiB
C++
199 lines
7.8 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) 2011 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_data.hpp>
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#include <mapnik/image_util.hpp>
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#include <mapnik/box2d.hpp>
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#include <mapnik/ctrans.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_u.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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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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CoordTransform ts(source.data_.width(), source.data_.height(),
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source.ext_);
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CoordTransform tt(target.data_.width(), target.data_.height(),
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target.ext_, offset_x, offset_y);
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unsigned mesh_nx = std::ceil(source.data_.width()/double(mesh_size) + 1);
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unsigned mesh_ny = std::ceil(source.data_.height()/double(mesh_size) + 1);
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ImageData<double> xs(mesh_nx, mesh_ny);
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ImageData<double> ys(mesh_nx, mesh_ny);
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// Precalculate reprojected mesh
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for(unsigned j=0; j<mesh_ny; ++j)
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{
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for (unsigned i=0; i<mesh_nx; ++i)
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{
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xs(i,j) = std::min(i*mesh_size,source.data_.width());
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ys(i,j) = std::min(j*mesh_size,source.data_.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.getData(), ys.getData(), nullptr, mesh_nx*mesh_ny);
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// Initialize AGG objects
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using pixfmt = agg::pixfmt_rgba32_pre;
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using color_type = pixfmt::color_type;
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using renderer_base = agg::renderer_base<pixfmt>;
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agg::rasterizer_scanline_aa<> rasterizer;
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agg::scanline_u8 scanline;
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agg::rendering_buffer buf((unsigned char*)target.data_.getData(),
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target.data_.width(),
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target.data_.height(),
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target.data_.width()*4);
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pixfmt pixf(buf);
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renderer_base rb(pixf);
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rasterizer.clip_box(0, 0, target.data_.width(), target.data_.height());
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agg::rendering_buffer buf_tile(
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(unsigned char*)source.data_.getData(),
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source.data_.width(),
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source.data_.height(),
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source.data_.width() * 4);
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pixfmt pixf_tile(buf_tile);
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using img_accessor_type = agg::image_accessor_clone<pixfmt>;
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img_accessor_type ia(pixf_tile);
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agg::span_allocator<color_type> sa;
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// Initialize filter
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agg::image_filter_lut filter;
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switch(scaling_method)
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{
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case SCALING_NEAR: break;
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case SCALING_BILINEAR8: // TODO - impl this or remove?
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case SCALING_BILINEAR:
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filter.calculate(agg::image_filter_bilinear(), true); break;
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case SCALING_BICUBIC:
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filter.calculate(agg::image_filter_bicubic(), true); break;
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case SCALING_SPLINE16:
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filter.calculate(agg::image_filter_spline16(), true); break;
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case SCALING_SPLINE36:
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filter.calculate(agg::image_filter_spline36(), true); break;
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case SCALING_HANNING:
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filter.calculate(agg::image_filter_hanning(), true); break;
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case SCALING_HAMMING:
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filter.calculate(agg::image_filter_hamming(), true); break;
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case SCALING_HERMITE:
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filter.calculate(agg::image_filter_hermite(), true); break;
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case SCALING_KAISER:
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filter.calculate(agg::image_filter_kaiser(), true); break;
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case SCALING_QUADRIC:
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filter.calculate(agg::image_filter_quadric(), true); break;
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case SCALING_CATROM:
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filter.calculate(agg::image_filter_catrom(), true); break;
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case SCALING_GAUSSIAN:
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filter.calculate(agg::image_filter_gaussian(), true); break;
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case SCALING_BESSEL:
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filter.calculate(agg::image_filter_bessel(), true); break;
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case SCALING_MITCHELL:
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filter.calculate(agg::image_filter_mitchell(), true); break;
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case SCALING_SINC:
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filter.calculate(agg::image_filter_sinc(source.get_filter_factor()), true); break;
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case SCALING_LANCZOS:
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filter.calculate(agg::image_filter_lanczos(source.get_filter_factor()), true); break;
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case SCALING_BLACKMAN:
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filter.calculate(agg::image_filter_blackman(source.get_filter_factor()), true); break;
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}
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// Project mesh cells into target interpolating raster inside each one
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for(unsigned j=0; j<mesh_ny-1; ++j)
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{
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for (unsigned 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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unsigned x0 = i * mesh_size;
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unsigned y0 = j * mesh_size;
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unsigned x1 = (i+1) * mesh_size;
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unsigned y1 = (j+1) * mesh_size;
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x1 = std::min(x1, source.data_.width());
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y1 = std::min(y1, source.data_.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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using interpolator_type = agg::span_interpolator_linear<agg::trans_affine>;
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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 = agg::span_image_filter_rgba_nn
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<img_accessor_type, interpolator_type>;
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span_gen_type sg(ia, interpolator);
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agg::render_scanlines_aa(rasterizer, scanline, rb,
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sa, sg);
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}
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else
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{
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using span_gen_type = agg::span_image_resample_rgba_affine
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<img_accessor_type>;
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span_gen_type sg(ia, interpolator, filter);
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agg::render_scanlines_aa(rasterizer, scanline, rb,
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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 mapnik
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