134 lines
5.1 KiB
C++
134 lines
5.1 KiB
C++
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#include "contour-combiners.h"
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#include <cfloat>
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#include "arithmetics.hpp"
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namespace msdfgen {
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static void initDistance(double &distance) {
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distance = -DBL_MAX;
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}
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static void initDistance(MultiDistance &distance) {
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distance.r = -DBL_MAX;
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distance.g = -DBL_MAX;
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distance.b = -DBL_MAX;
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}
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static double resolveDistance(double distance) {
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return distance;
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}
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static double resolveDistance(const MultiDistance &distance) {
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return median(distance.r, distance.g, distance.b);
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}
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template <class EdgeSelector>
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SimpleContourCombiner<EdgeSelector>::SimpleContourCombiner(const Shape &shape) { }
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template <class EdgeSelector>
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void SimpleContourCombiner<EdgeSelector>::reset(const Point2 &p) {
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shapeEdgeSelector.reset(p);
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}
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template <class EdgeSelector>
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EdgeSelector &SimpleContourCombiner<EdgeSelector>::edgeSelector(int) {
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return shapeEdgeSelector;
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}
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template <class EdgeSelector>
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typename SimpleContourCombiner<EdgeSelector>::DistanceType SimpleContourCombiner<EdgeSelector>::distance() const {
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return shapeEdgeSelector.distance();
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}
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template class SimpleContourCombiner<TrueDistanceSelector>;
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template class SimpleContourCombiner<PseudoDistanceSelector>;
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template class SimpleContourCombiner<MultiDistanceSelector>;
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template class SimpleContourCombiner<MultiAndTrueDistanceSelector>;
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template <class EdgeSelector>
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OverlappingContourCombiner<EdgeSelector>::OverlappingContourCombiner(const Shape &shape) {
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windings.reserve(shape.contours.size());
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for (std::vector<Contour>::const_iterator contour = shape.contours.begin(); contour != shape.contours.end(); ++contour)
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windings.push_back(contour->winding());
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edgeSelectors.resize(shape.contours.size());
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}
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template <class EdgeSelector>
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void OverlappingContourCombiner<EdgeSelector>::reset(const Point2 &p) {
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this->p = p;
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for (typename std::vector<EdgeSelector>::iterator contourEdgeSelector = edgeSelectors.begin(); contourEdgeSelector != edgeSelectors.end(); ++contourEdgeSelector)
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contourEdgeSelector->reset(p);
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}
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template <class EdgeSelector>
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EdgeSelector &OverlappingContourCombiner<EdgeSelector>::edgeSelector(int i) {
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return edgeSelectors[i];
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}
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template <class EdgeSelector>
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typename OverlappingContourCombiner<EdgeSelector>::DistanceType OverlappingContourCombiner<EdgeSelector>::distance() const {
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int contourCount = (int) edgeSelectors.size();
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EdgeSelector shapeEdgeSelector;
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EdgeSelector innerEdgeSelector;
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EdgeSelector outerEdgeSelector;
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shapeEdgeSelector.reset(p);
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innerEdgeSelector.reset(p);
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outerEdgeSelector.reset(p);
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for (int i = 0; i < contourCount; ++i) {
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DistanceType edgeDistance = edgeSelectors[i].distance();
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shapeEdgeSelector.merge(edgeSelectors[i]);
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if (windings[i] > 0 && resolveDistance(edgeDistance) >= 0)
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innerEdgeSelector.merge(edgeSelectors[i]);
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if (windings[i] < 0 && resolveDistance(edgeDistance) <= 0)
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outerEdgeSelector.merge(edgeSelectors[i]);
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}
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DistanceType shapeDistance = shapeEdgeSelector.distance();
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DistanceType innerDistance = innerEdgeSelector.distance();
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DistanceType outerDistance = outerEdgeSelector.distance();
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double innerScalarDistance = resolveDistance(innerDistance);
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double outerScalarDistance = resolveDistance(outerDistance);
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DistanceType distance;
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initDistance(distance);
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int winding = 0;
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if (innerScalarDistance >= 0 && fabs(innerScalarDistance) <= fabs(outerScalarDistance)) {
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distance = innerDistance;
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winding = 1;
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for (int i = 0; i < contourCount; ++i)
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if (windings[i] > 0) {
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DistanceType contourDistance = edgeSelectors[i].distance();
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if (fabs(resolveDistance(contourDistance)) < fabs(outerScalarDistance) && resolveDistance(contourDistance) > resolveDistance(distance))
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distance = contourDistance;
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}
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} else if (outerScalarDistance <= 0 && fabs(outerScalarDistance) < fabs(innerScalarDistance)) {
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distance = outerDistance;
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winding = -1;
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for (int i = 0; i < contourCount; ++i)
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if (windings[i] < 0) {
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DistanceType contourDistance = edgeSelectors[i].distance();
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if (fabs(resolveDistance(contourDistance)) < fabs(innerScalarDistance) && resolveDistance(contourDistance) < resolveDistance(distance))
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distance = contourDistance;
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}
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} else
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return shapeDistance;
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for (int i = 0; i < contourCount; ++i)
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if (windings[i] != winding) {
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DistanceType contourDistance = edgeSelectors[i].distance();
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if (resolveDistance(contourDistance)*resolveDistance(distance) >= 0 && fabs(resolveDistance(contourDistance)) < fabs(resolveDistance(distance)))
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distance = contourDistance;
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}
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if (resolveDistance(distance) == resolveDistance(shapeDistance))
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distance = shapeDistance;
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return distance;
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}
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template class OverlappingContourCombiner<TrueDistanceSelector>;
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template class OverlappingContourCombiner<PseudoDistanceSelector>;
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template class OverlappingContourCombiner<MultiDistanceSelector>;
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template class OverlappingContourCombiner<MultiAndTrueDistanceSelector>;
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}
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