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#pragma once
#include <mbgl/style/layer.hpp>
#include <mbgl/style/types.hpp>
#include <mbgl/style/filter.hpp>
#include <mbgl/style/layer_observer.hpp>
#include <mbgl/renderer/render_pass.hpp>
#include <mbgl/util/noncopyable.hpp>
#include <mbgl/tile/geometry_tile_data.hpp>
#include <rapidjson/writer.h>
#include <rapidjson/stringbuffer.h>
#include <memory>
#include <string>
#include <limits>
namespace mbgl {
class Bucket;
namespace style {
class CascadeParameters;
class PropertyEvaluationParameters;
class BucketParameters;
/**
* `Layer::Impl` contains the internal implementation of `Layer`: the details that need to be accessible to other parts
* of the code, but hidden from the public API. Like `Layer`, it is an abstract base class, with derived classes for
* each layer type.
*
* Members that are public in `Layer` are part of the public API for all layers.
* Members that are public in `FooLayer` are part of the public API for "foo" layers.
* Members that are public in `Layer::Impl` are part of the internal API for all layers.
* Members that are public in `FooLayer::Impl` are part of the internal API for "foo" layers.
* Members that are private in `FooLayer::Impl` are internal to "foo" layers.
*/
class Layer::Impl {
public:
virtual ~Impl() = default;
// Create a new layer with the specified `id` and `sourceID`. All other properties
// are copied from this layer.
std::unique_ptr<Layer> copy(const std::string& id,
const std::string& sourceID) const;
// Create an identical copy of this layer.
virtual std::unique_ptr<Layer> clone() const = 0;
// Create a layer, copying all properties except id and paint properties from this layer.
virtual std::unique_ptr<Layer> cloneRef(const std::string& id) const = 0;
// Utility function for automatic layer grouping.
virtual void stringifyLayout(rapidjson::Writer<rapidjson::StringBuffer>&) const = 0;
// Partially evaluate paint properties based on a set of classes.
virtual void cascade(const CascadeParameters&) = 0;
// Fully evaluate cascaded paint properties based on a zoom level.
// Returns true if any paint properties have active transitions.
virtual bool evaluate(const PropertyEvaluationParameters&) = 0;
virtual std::unique_ptr<Bucket> createBucket(BucketParameters&, const GeometryTileLayer&) const = 0;
// Checks whether this layer needs to be rendered in the given render pass.
bool hasRenderPass(RenderPass) const;
// Checks whether this layer can be rendered.
bool needsRendering(float zoom) const;
virtual float getQueryRadius() const { return 0; }
virtual bool queryIntersectsGeometry(
const GeometryCoordinates&,
const GeometryCollection&,
const float,
const float) const { return false; };
void setObserver(LayerObserver*);
public:
std::string id;
std::string source;
std::string sourceLayer;
Filter filter;
float minZoom = -std::numeric_limits<float>::infinity();
float maxZoom = std::numeric_limits<float>::infinity();
VisibilityType visibility = VisibilityType::Visible;
LayerObserver nullObserver;
LayerObserver* observer = &nullObserver;
protected:
Impl() = default;
Impl(const Impl&) = default;
Impl& operator=(const Impl&) = delete;
// Stores what render passes this layer is currently enabled for. This depends on the
// evaluated StyleProperties object and is updated accordingly.
RenderPass passes = RenderPass::None;
};
} // namespace style
} // namespace mbgl
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