118 lines
2.9 KiB
C++
118 lines
2.9 KiB
C++
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#pragma once
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#include "Vector2.h"
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#include "SignedDistance.h"
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#include "edge-segments.h"
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namespace msdfgen {
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struct MultiDistance {
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double r, g, b;
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};
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struct MultiAndTrueDistance : MultiDistance {
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double a;
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};
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/// Selects the nearest edge by its true distance.
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class TrueDistanceSelector {
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public:
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typedef double DistanceType;
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struct EdgeCache {
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Point2 point;
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double absDistance;
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EdgeCache();
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};
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void reset(const Point2 &p);
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void addEdge(EdgeCache &cache, const EdgeSegment *prevEdge, const EdgeSegment *edge, const EdgeSegment *nextEdge);
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void merge(const TrueDistanceSelector &other);
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DistanceType distance() const;
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private:
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Point2 p;
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SignedDistance minDistance;
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};
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class PseudoDistanceSelectorBase {
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public:
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struct EdgeCache {
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Point2 point;
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double absDistance;
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double aDomainDistance, bDomainDistance;
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double aPseudoDistance, bPseudoDistance;
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EdgeCache();
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};
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static bool getPseudoDistance(double &distance, const Vector2 &ep, const Vector2 &edgeDir);
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PseudoDistanceSelectorBase();
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void reset(double delta);
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bool isEdgeRelevant(const EdgeCache &cache, const EdgeSegment *edge, const Point2 &p) const;
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void addEdgeTrueDistance(const EdgeSegment *edge, const SignedDistance &distance, double param);
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void addEdgePseudoDistance(double distance);
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void merge(const PseudoDistanceSelectorBase &other);
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double computeDistance(const Point2 &p) const;
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SignedDistance trueDistance() const;
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private:
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SignedDistance minTrueDistance;
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double minNegativePseudoDistance;
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double minPositivePseudoDistance;
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const EdgeSegment *nearEdge;
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double nearEdgeParam;
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};
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/// Selects the nearest edge by its pseudo-distance.
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class PseudoDistanceSelector : public PseudoDistanceSelectorBase {
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public:
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typedef double DistanceType;
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void reset(const Point2 &p);
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void addEdge(EdgeCache &cache, const EdgeSegment *prevEdge, const EdgeSegment *edge, const EdgeSegment *nextEdge);
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DistanceType distance() const;
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private:
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Point2 p;
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};
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/// Selects the nearest edge for each of the three channels by its pseudo-distance.
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class MultiDistanceSelector {
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public:
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typedef MultiDistance DistanceType;
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typedef PseudoDistanceSelectorBase::EdgeCache EdgeCache;
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void reset(const Point2 &p);
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void addEdge(EdgeCache &cache, const EdgeSegment *prevEdge, const EdgeSegment *edge, const EdgeSegment *nextEdge);
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void merge(const MultiDistanceSelector &other);
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DistanceType distance() const;
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SignedDistance trueDistance() const;
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private:
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Point2 p;
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PseudoDistanceSelectorBase r, g, b;
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};
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/// Selects the nearest edge for each of the three color channels by its pseudo-distance and by true distance for the alpha channel.
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class MultiAndTrueDistanceSelector : public MultiDistanceSelector {
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public:
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typedef MultiAndTrueDistance DistanceType;
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DistanceType distance() const;
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};
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}
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