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vector_tile_processor.ipp
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vector_tile_processor.ipp
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// mapnik-vector-tile
#include "vector_tile_geometry_clipper.hpp"
#include "vector_tile_geometry_feature.hpp"
#include "vector_tile_geometry_simplifier.hpp"
#include "vector_tile_raster_clipper.hpp"
#include "vector_tile_strategy.hpp"
#include "vector_tile_tile.hpp"
#include "vector_tile_layer.hpp"
// mapnik
#include <mapnik/geometry/box2d.hpp>
#include <mapnik/datasource.hpp>
#include <mapnik/feature.hpp>
#include <mapnik/image_scaling.hpp>
#include <mapnik/layer.hpp>
#include <mapnik/map.hpp>
#include <mapnik/version.hpp>
#include <mapnik/attribute.hpp>
#if MAPNIK_VERSION >= 300100
#include <mapnik/geometry/transform.hpp>
#else
#include <mapnik/geometry_transform.hpp>
#endif
// boost
#include <boost/optional.hpp>
// std
#include <future>
namespace mapnik
{
namespace vector_tile_impl
{
namespace detail
{
inline void create_geom_layer(tile_layer & layer,
double simplify_distance,
double area_threshold,
polygon_fill_type fill_type,
bool strictly_simple,
bool multi_polygon_union,
bool process_all_rings)
{
layer_builder_pbf builder(layer.name(), layer.layer_extent(), layer.get_data());
// query for the features
mapnik::featureset_ptr features = layer.get_features();
if (!features)
{
return;
}
mapnik::feature_ptr feature = features->next();
if (!feature)
{
return;
}
using encoding_process = mapnik::vector_tile_impl::geometry_to_feature_pbf_visitor;
using clipping_process = mapnik::vector_tile_impl::geometry_clipper<encoding_process>;
mapnik::vector_tile_impl::vector_tile_strategy vs(layer.get_view_transform());
mapnik::box2d<double> const& buffered_extent = layer.get_target_buffered_extent();
const mapbox::geometry::point<double> p1_min(buffered_extent.minx(), buffered_extent.miny());
const mapbox::geometry::point<double> p1_max(buffered_extent.maxx(), buffered_extent.maxy());
const mapbox::geometry::point<std::int64_t> p2_min = mapnik::geometry::transform<std::int64_t>(p1_min, vs);
const mapbox::geometry::point<std::int64_t> p2_max = mapnik::geometry::transform<std::int64_t>(p1_max, vs);
const double minx = std::min(p2_min.x, p2_max.x);
const double maxx = std::max(p2_min.x, p2_max.x);
const double miny = std::min(p2_min.y, p2_max.y);
const double maxy = std::max(p2_min.y, p2_max.y);
const mapbox::geometry::box<std::int64_t> tile_clipping_extent(mapbox::geometry::point<std::int64_t>(minx, miny),
mapbox::geometry::point<std::int64_t>(maxx, maxy));
if (simplify_distance > 0)
{
using simplifier_process = mapnik::vector_tile_impl::geometry_simplifier<clipping_process>;
if (layer.get_proj_transform().equal())
{
using strategy_type = mapnik::vector_tile_impl::vector_tile_strategy;
using transform_type = mapnik::vector_tile_impl::transform_visitor<strategy_type, simplifier_process>;
while (feature)
{
mapnik::geometry::geometry<double> const& geom = feature->get_geometry();
encoding_process encoder(*feature, builder);
clipping_process clipper(tile_clipping_extent,
area_threshold,
strictly_simple,
multi_polygon_union,
fill_type,
process_all_rings,
encoder);
simplifier_process simplifier(simplify_distance, clipper);
transform_type transformer(vs, buffered_extent, simplifier);
mapnik::util::apply_visitor(transformer, geom);
feature = features->next();
}
}
else
{
using strategy_type = mapnik::vector_tile_impl::vector_tile_strategy_proj;
using transform_type = mapnik::vector_tile_impl::transform_visitor<strategy_type, simplifier_process>;
strategy_type vs2(layer.get_proj_transform(), layer.get_view_transform());
mapnik::box2d<double> const& trans_buffered_extent = layer.get_source_buffered_extent();
while (feature)
{
mapnik::geometry::geometry<double> const& geom = feature->get_geometry();
encoding_process encoder(*feature, builder);
clipping_process clipper(tile_clipping_extent,
area_threshold,
strictly_simple,
multi_polygon_union,
fill_type,
process_all_rings,
encoder);
simplifier_process simplifier(simplify_distance, clipper);
transform_type transformer(vs2, trans_buffered_extent, simplifier);
mapnik::util::apply_visitor(transformer, geom);
feature = features->next();
}
}
}
else
{
if (layer.get_proj_transform().equal())
{
using strategy_type = mapnik::vector_tile_impl::vector_tile_strategy;
using transform_type = mapnik::vector_tile_impl::transform_visitor<strategy_type, clipping_process>;
while (feature)
{
mapnik::geometry::geometry<double> const& geom = feature->get_geometry();
encoding_process encoder(*feature, builder);
clipping_process clipper(tile_clipping_extent,
area_threshold,
strictly_simple,
multi_polygon_union,
fill_type,
process_all_rings,
encoder);
transform_type transformer(vs, buffered_extent, clipper);
mapnik::util::apply_visitor(transformer, geom);
feature = features->next();
}
}
else
{
using strategy_type = mapnik::vector_tile_impl::vector_tile_strategy_proj;
using transform_type = mapnik::vector_tile_impl::transform_visitor<strategy_type, clipping_process>;
strategy_type vs2(layer.get_proj_transform(), layer.get_view_transform());
mapnik::box2d<double> const& trans_buffered_extent = layer.get_source_buffered_extent();
while (feature)
{
mapnik::geometry::geometry<double> const& geom = feature->get_geometry();
encoding_process encoder(*feature, builder);
clipping_process clipper(tile_clipping_extent,
area_threshold,
strictly_simple,
multi_polygon_union,
fill_type,
process_all_rings,
encoder);
transform_type transformer(vs2, trans_buffered_extent, clipper);
mapnik::util::apply_visitor(transformer, geom);
feature = features->next();
}
}
}
layer.build(builder);
return;
}
inline void create_raster_layer(tile_layer & layer,
std::string const& image_format,
scaling_method_e scaling_method)
{
layer_builder_pbf builder(layer.name(), layer.layer_extent(), layer.get_data());
// query for the features
mapnik::featureset_ptr features = layer.get_features();
if (!features)
{
return;
}
mapnik::feature_ptr feature = features->next();
if (!feature)
{
return;
}
mapnik::raster_ptr const& source = feature->get_raster();
if (!source)
{
return;
}
mapnik::box2d<double> target_ext = box2d<double>(source->ext_);
layer.get_proj_transform().backward(target_ext, PROJ_ENVELOPE_POINTS);
mapnik::box2d<double> ext = layer.get_view_transform().forward(target_ext);
int start_x = static_cast<int>(std::floor(ext.minx()+.5));
int start_y = static_cast<int>(std::floor(ext.miny()+.5));
int end_x = static_cast<int>(std::floor(ext.maxx()+.5));
int end_y = static_cast<int>(std::floor(ext.maxy()+.5));
int raster_width = end_x - start_x;
int raster_height = end_y - start_y;
if (raster_width > 0 && raster_height > 0)
{
builder.make_painted();
raster_clipper visit(*source,
target_ext,
ext,
layer.get_proj_transform(),
image_format,
scaling_method,
layer.layer_extent(),
layer.layer_extent(),
raster_width,
raster_height,
start_x,
start_y);
std::string buffer = mapnik::util::apply_visitor(visit, source->data_);
raster_to_feature(buffer, *feature, builder);
}
layer.build(builder);
return;
}
} // end ns detail
MAPNIK_VECTOR_INLINE void processor::update_tile(tile & t,
double scale_denom,
int offset_x,
int offset_y)
{
// Futures
std::vector<tile_layer> tile_layers;
for (mapnik::layer const& lay : m_.layers())
{
if (t.has_layer(lay.name()))
{
continue;
}
tile_layers.emplace_back(m_,
lay,
t.extent(),
t.tile_size(),
t.buffer_size(),
scale_factor_,
scale_denom,
offset_x,
offset_y,
vars_);
if (!tile_layers.back().is_valid())
{
t.add_empty_layer(lay.name());
tile_layers.pop_back();
continue;
}
}
if (threading_mode_ == std::launch::deferred)
{
for (auto & layer_ref : tile_layers)
{
if (layer_ref.get_ds()->type() == datasource::Vector)
{
detail::create_geom_layer(layer_ref,
simplify_distance_,
area_threshold_,
fill_type_,
strictly_simple_,
multi_polygon_union_,
process_all_rings_
);
}
else // Raster
{
detail::create_raster_layer(layer_ref,
image_format_,
scaling_method_
);
}
}
}
else
{
std::vector<std::future<void> > future_layers;
future_layers.reserve(tile_layers.size());
for (auto & layer_ref : tile_layers)
{
if (layer_ref.get_ds()->type() == datasource::Vector)
{
future_layers.push_back(std::async(
threading_mode_,
detail::create_geom_layer,
std::ref(layer_ref),
simplify_distance_,
area_threshold_,
fill_type_,
strictly_simple_,
multi_polygon_union_,
process_all_rings_
));
}
else // Raster
{
future_layers.push_back(std::async(
threading_mode_,
detail::create_raster_layer,
std::ref(layer_ref),
image_format_,
scaling_method_
));
}
}
for (auto && lay_future : future_layers)
{
if (!lay_future.valid())
{
throw std::runtime_error("unexpected invalid async return");
}
lay_future.get();
}
}
for (auto & layer_ref : tile_layers)
{
t.add_layer(layer_ref);
}
}
} // end ns vector_tile_impl
} // end ns mapnik