SkSGMerge.h

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/*
 * Copyright 2017 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
 
#ifndef SkSGMerge_DEFINED
#define SkSGMerge_DEFINED
 
#include "include/core/SkPath.h"
#include "include/core/SkRect.h"
#include "include/core/SkRefCnt.h"
#include "modules/sksg/include/SkSGGeometryNode.h"
 
#include <utility>
#include <vector>
 
class SkCanvas;
class SkMatrix;
class SkPaint;
struct SkPoint;
 
namespace sksg {
class InvalidationController;
 
/**
 * Concrete Geometry node, combining other geometries based on Mode.
 */
class Merge final : public GeometryNode {
public:
    enum class Mode {
        // Append path mode.
        kMerge,
 
        // SkPathOp ops.
        kUnion,
        kIntersect,
        kDifference,
        kReverseDifference,
        kXOR,
    };
 
    struct Rec {
        sk_sp<GeometryNode> fGeo;
        Mode                fMode;
    };
 
    static sk_sp<Merge> Make(std::vector<Rec>&& recs) {
        return sk_sp<Merge>(new Merge(std::move(recs)));
    }
 
    ~Merge() override;
 
protected:
    void onClip(SkCanvas*, bool antiAlias) const override;
    void onDraw(SkCanvas*, const SkPaint&) const override;
    bool onContains(const SkPoint&)        const override;
 
    SkRect onRevalidate(InvalidationController*, const SkMatrix&) override;
    SkPath onAsPath() const override;
 
private:
    Merge(std::vector<Rec>&& recs);
 
    const std::vector<Rec> fRecs;
    SkPath                 fMerged;
 
    using INHERITED = GeometryNode;
};
 
} // namespace sksg
 
#endif // SkSGMerge_DEFINED