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#ifndef MBGL_STYLE_STYLE_LAYER
#define MBGL_STYLE_STYLE_LAYER
#include <mbgl/style/types.hpp>
#include <mbgl/style/filter_expression.hpp>
#include <mbgl/renderer/render_pass.hpp>
#include <mbgl/util/noncopyable.hpp>
#include <mbgl/util/rapidjson.hpp>
#include <memory>
#include <string>
#include <limits>
namespace mbgl {
class StyleCascadeParameters;
class StyleCalculationParameters;
class StyleBucketParameters;
class Bucket;
class StyleLayer {
public:
virtual ~StyleLayer() = default;
// Check whether this layer is of the given subtype.
template <class T> bool is() const { return dynamic_cast<const T*>(this); }
// Dynamically cast this layer to the given subtype.
template <class T> T* as() { return dynamic_cast< T*>(this); }
template <class T> const T* as() const { return dynamic_cast<const T*>(this); }
// Create a copy of this layer.
virtual std::unique_ptr<StyleLayer> clone() const = 0;
virtual void parseLayout(const JSValue& value) = 0;
virtual void parsePaints(const JSValue& value) = 0;
// If the layer has a ref, the ref. Otherwise, the id.
const std::string& bucketName() const;
// Partially evaluate paint properties based on a set of classes.
virtual void cascade(const StyleCascadeParameters&) = 0;
// Fully evaluate cascaded paint properties based on a zoom level.
// Returns true if any paint properties have active transitions.
virtual bool recalculate(const StyleCalculationParameters&) = 0;
virtual std::unique_ptr<Bucket> createBucket(StyleBucketParameters&) 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() const;
public:
std::string id;
std::string ref;
std::string source;
std::string sourceLayer;
FilterExpression filter;
float minZoom = -std::numeric_limits<float>::infinity();
float maxZoom = std::numeric_limits<float>::infinity();
VisibilityType visibility = VisibilityType::Visible;
protected:
StyleLayer() = default;
StyleLayer(const StyleLayer&) = default;
StyleLayer& operator=(const StyleLayer&) = 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 mbgl
#endif
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