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#pragma once
#include <list>
#include <mbgl/geometry/feature_index.hpp>
#include <mbgl/layout/layout.hpp>
#include <mbgl/renderer/bucket_parameters.hpp>
#include <mbgl/renderer/render_layer.hpp>
#include <mbgl/style/expression/image.hpp>
#include <mbgl/style/layer_properties.hpp>
namespace mbgl {
class PatternDependency {
public:
std::string min;
std::string mid;
std::string max;
};
using PatternLayerMap = std::map<std::string, PatternDependency>;
class PatternFeature {
public:
PatternFeature(std::size_t i_,
std::unique_ptr<GeometryTileFeature> feature_,
PatternLayerMap patterns_,
double sortKey_ = 0.0f)
: i(i_), feature(std::move(feature_)), patterns(std::move(patterns_)), sortKey(sortKey_) {}
friend bool operator<(const PatternFeature& lhs, const PatternFeature& rhs) { return lhs.sortKey < rhs.sortKey; }
std::size_t i;
std::unique_ptr<GeometryTileFeature> feature;
PatternLayerMap patterns;
double sortKey;
};
template <typename SortKeyPropertyType>
struct PatternFeatureInserter;
template <>
struct PatternFeatureInserter<void> {
template <typename PropertiesType>
static void insert(std::vector<PatternFeature>& features,
std::size_t index,
std::unique_ptr<GeometryTileFeature> feature,
PatternLayerMap patternDependencyMap,
float /*zoom*/,
const PropertiesType&) {
features.emplace_back(index, std::move(feature), std::move(patternDependencyMap));
}
};
template <class SortKeyPropertyType>
struct PatternFeatureInserter {
template <typename PropertiesType>
static void insert(std::vector<PatternFeature>& features,
std::size_t index,
std::unique_ptr<GeometryTileFeature> feature,
PatternLayerMap patternDependencyMap,
float zoom,
const PropertiesType& properties) {
const auto& sortKeyProperty = properties.template get<SortKeyPropertyType>();
double sortKey = sortKeyProperty.evaluate(*feature, zoom, SortKeyPropertyType::defaultValue());
PatternFeature patternFeature{index, std::move(feature), std::move(patternDependencyMap), sortKey};
const auto lowerBound = std::lower_bound(features.cbegin(), features.cend(), patternFeature);
features.insert(lowerBound, std::move(patternFeature));
}
};
template <class BucketType,
class LayerPropertiesType,
class PatternPropertyType,
class LayoutPropertiesType = typename style::Properties<>,
class SortKeyPropertyType = void>
class PatternLayout : public Layout {
public:
PatternLayout(const BucketParameters& parameters,
const std::vector<Immutable<style::LayerProperties>>& group,
std::unique_ptr<GeometryTileLayer> sourceLayer_,
const LayoutParameters& layoutParameters)
: sourceLayer(std::move(sourceLayer_)),
zoom(parameters.tileID.overscaledZ),
overscaling(parameters.tileID.overscaleFactor()),
hasPattern(false) {
assert(!group.empty());
auto leaderLayerProperties = staticImmutableCast<LayerPropertiesType>(group.front());
layout = leaderLayerProperties->layerImpl().layout.evaluate(PropertyEvaluationParameters(zoom));
sourceLayerID = leaderLayerProperties->layerImpl().sourceLayer;
bucketLeaderID = leaderLayerProperties->layerImpl().id;
for (const auto& layerProperties : group) {
const std::string& layerId = layerProperties->baseImpl->id;
const auto& evaluated = style::getEvaluated<LayerPropertiesType>(layerProperties);
const auto patternProperty = evaluated.template get<PatternPropertyType>();
const auto constantPattern = patternProperty.constantOr(Faded<style::expression::Image>{"", ""});
// determine if layer group has any layers that use *-pattern property and add
// constant pattern dependencies.
if (!patternProperty.isConstant()) {
hasPattern = true;
} else if (!constantPattern.to.id().empty()) {
hasPattern = true;
layoutParameters.imageDependencies.emplace(constantPattern.to.id(), ImageType::Pattern);
layoutParameters.imageDependencies.emplace(constantPattern.from.id(), ImageType::Pattern);
}
layerPropertiesMap.emplace(layerId, layerProperties);
}
const size_t featureCount = sourceLayer->featureCount();
for (size_t i = 0; i < featureCount; ++i) {
auto feature = sourceLayer->getFeature(i);
if (!leaderLayerProperties->layerImpl().filter(style::expression::EvaluationContext { this->zoom, feature.get() }))
continue;
PatternLayerMap patternDependencyMap;
if (hasPattern) {
for (const auto& layerProperties : group) {
const std::string& layerId = layerProperties->baseImpl->id;
const auto it = layerPropertiesMap.find(layerId);
if (it != layerPropertiesMap.end()) {
const auto paint = static_cast<const LayerPropertiesType&>(*it->second).evaluated;
const auto patternProperty = paint.template get<PatternPropertyType>();
if (!patternProperty.isConstant()) {
// For layers with non-data-constant pattern properties, evaluate their expression and add
// the patterns to the dependency vector
const auto min = patternProperty.evaluate(*feature,
zoom - 1,
layoutParameters.availableImages,
PatternPropertyType::defaultValue());
const auto mid = patternProperty.evaluate(
*feature, zoom, layoutParameters.availableImages, PatternPropertyType::defaultValue());
const auto max = patternProperty.evaluate(*feature,
zoom + 1,
layoutParameters.availableImages,
PatternPropertyType::defaultValue());
layoutParameters.imageDependencies.emplace(min.to.id(), ImageType::Pattern);
layoutParameters.imageDependencies.emplace(mid.to.id(), ImageType::Pattern);
layoutParameters.imageDependencies.emplace(max.to.id(), ImageType::Pattern);
patternDependencyMap.emplace(layerId,
PatternDependency{min.to.id(), mid.to.id(), max.to.id()});
}
}
}
}
PatternFeatureInserter<SortKeyPropertyType>::insert(
features, i, std::move(feature), std::move(patternDependencyMap), zoom, layout);
}
};
bool hasDependencies() const override {
return hasPattern;
}
void createBucket(const ImagePositions& patternPositions, std::unique_ptr<FeatureIndex>& featureIndex, std::unordered_map<std::string, LayerRenderData>& renderData, const bool, const bool) override {
auto bucket = std::make_shared<BucketType>(layout, layerPropertiesMap, zoom, overscaling);
for (auto & patternFeature : features) {
const auto i = patternFeature.i;
std::unique_ptr<GeometryTileFeature> feature = std::move(patternFeature.feature);
const PatternLayerMap& patterns = patternFeature.patterns;
const GeometryCollection& geometries = feature->getGeometries();
bucket->addFeature(*feature, geometries, patternPositions, patterns, i);
featureIndex->insert(geometries, i, sourceLayerID, bucketLeaderID);
}
if (bucket->hasData()) {
for (const auto& pair : layerPropertiesMap) {
renderData.emplace(pair.first, LayerRenderData {bucket, pair.second});
}
}
};
protected:
std::map<std::string, Immutable<style::LayerProperties>> layerPropertiesMap;
std::string bucketLeaderID;
const std::unique_ptr<GeometryTileLayer> sourceLayer;
std::vector<PatternFeature> features;
typename LayoutPropertiesType::PossiblyEvaluated layout;
const float zoom;
const uint32_t overscaling;
std::string sourceLayerID;
bool hasPattern;
};
} // namespace mbgl
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