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/*
* Copyright 2025 Google LLC.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkPathIter_DEFINED
#define SkPathIter_DEFINED
#include "include/core/SkPathTypes.h"
#include "include/core/SkPoint.h"
#include "include/core/SkSpan.h"
#include <array>
#include <cstddef>
#include <optional>
class SK_API SkPathIter {
public:
struct Rec {
SkSpan<const SkPoint> fPoints;
float fConicWeight;
SkPathVerb fVerb;
float conicWeight() const {
SkASSERT(fVerb == SkPathVerb::kConic);
return fConicWeight;
}
};
SkPathIter(SkSpan<const SkPoint> pts, SkSpan<const SkPathVerb> vbs, SkSpan<const float> cns)
: pIndex(0), vIndex(0), cIndex(0)
, fPoints(pts), fVerbs(vbs), fConics(cns)
{
// For compat older iterators, we trim off a trailing Move.
// SkPathData is defined to never create this pattern, so perhaps in the future
// this check can be removed (or replaced by an assert)
if (!vbs.empty() && vbs.back() == SkPathVerb::kMove) {
fVerbs = vbs.first(vbs.size() - 1);
}
}
/* Holds the current verb, and its associated points
* move: pts[0]
* line: pts[0..1]
* quad: pts[0..2]
* conic: pts[0..2] fConicWeight
* cubic: pts[0..3]
* close: pts[0..1] ... as if close were a line from pts[0] to pts[1]
*/
std::optional<Rec> next();
std::optional<SkPathVerb> peekNextVerb() const {
if (vIndex < fVerbs.size()) {
return fVerbs[vIndex];
}
return {};
}
private:
size_t pIndex, vIndex, cIndex;
SkSpan<const SkPoint> fPoints;
SkSpan<const SkPathVerb> fVerbs;
SkSpan<const float> fConics;
std::array<SkPoint, 2> fClosePointStorage;
};
class SkPathContourIter {
public:
struct Rec {
SkSpan<const SkPoint> fPoints;
SkSpan<const SkPathVerb> fVerbs;
SkSpan<const float> fConics;
};
SkPathContourIter(SkSpan<const SkPoint> pts, SkSpan<const SkPathVerb> vbs,
SkSpan<const float> cns)
: fPoints(pts), fVerbs(vbs), fConics(cns)
{}
std::optional<Rec> next();
private:
SkSpan<const SkPoint> fPoints;
SkSpan<const SkPathVerb> fVerbs;
SkSpan<const float> fConics;
};
#endif
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