modules/skottie/src/SkottieAdapter.h

/*
 * Copyright 2018 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#ifndef SkottieAdapter_DEFINED
#define SkottieAdapter_DEFINED

#include "SkPoint.h"
#include "SkRefCnt.h"
#include "SkSize.h"
#include "SkottieValue.h"

namespace sksg {

class Color;
class Draw;
class Gradient;
class Group;
class LinearGradient;
class Matrix;
class Path;
class RadialGradient;
class RRect;
class Text;
class TrimEffect;

};

namespace skottie {

#define ADAPTER_PROPERTY(p_name, p_type, p_default) \
    const p_type& get##p_name() const {             \
        return f##p_name;                           \
    }                                               \
    void set##p_name(const p_type& p) {             \
        if (p == f##p_name) return;                 \
        f##p_name = p;                              \
        this->apply();                              \
    }                                               \
  private:                                          \
    p_type f##p_name = p_default;                   \
  public:

class RRectAdapter final : public SkRefCnt {
public:
    explicit RRectAdapter(sk_sp<sksg::RRect>);

    ADAPTER_PROPERTY(Position, SkPoint , SkPoint::Make(0, 0))
    ADAPTER_PROPERTY(Size    , SkSize  ,  SkSize::Make(0, 0))
    ADAPTER_PROPERTY(Radius  , SkSize  ,  SkSize::Make(0, 0))

private:
    void apply();

    sk_sp<sksg::RRect> fRRectNode;

    using INHERITED = SkRefCnt;
};

class PolyStarAdapter final : public SkRefCnt {
public:
    enum class Type {
        kStar, kPoly,
    };

    PolyStarAdapter(sk_sp<sksg::Path>, Type);

    ADAPTER_PROPERTY(Position      , SkPoint , SkPoint::Make(0, 0))
    ADAPTER_PROPERTY(PointCount    , SkScalar, 0)
    ADAPTER_PROPERTY(InnerRadius   , SkScalar, 0)
    ADAPTER_PROPERTY(OuterRadius   , SkScalar, 0)
    ADAPTER_PROPERTY(InnerRoundness, SkScalar, 0)
    ADAPTER_PROPERTY(OuterRoundness, SkScalar, 0)
    ADAPTER_PROPERTY(Rotation      , SkScalar, 0)

private:
    void apply();

    sk_sp<sksg::Path> fPathNode;
    Type              fType;

    using INHERITED = SkRefCnt;
};

class TransformAdapter final : public SkRefCnt {
public:
    explicit TransformAdapter(sk_sp<sksg::Matrix>);

    ADAPTER_PROPERTY(AnchorPoint, SkPoint , SkPoint::Make(0, 0))
    ADAPTER_PROPERTY(Position   , SkPoint , SkPoint::Make(0, 0))
    ADAPTER_PROPERTY(Scale      , SkVector, SkPoint::Make(100, 100))
    ADAPTER_PROPERTY(Rotation   , SkScalar, 0)
    ADAPTER_PROPERTY(Skew       , SkScalar, 0)
    ADAPTER_PROPERTY(SkewAxis   , SkScalar, 0)

    SkMatrix totalMatrix() const;

private:
    void apply();

    sk_sp<sksg::Matrix> fMatrixNode;

    using INHERITED = SkRefCnt;
};

class GradientAdapter : public SkRefCnt {
public:
    ADAPTER_PROPERTY(StartPoint, SkPoint        , SkPoint::Make(0, 0)   )
    ADAPTER_PROPERTY(EndPoint  , SkPoint        , SkPoint::Make(0, 0)   )
    ADAPTER_PROPERTY(ColorStops, VectorValue    , VectorValue()         )

protected:
    GradientAdapter(sk_sp<sksg::Gradient>, size_t stopCount);

    const SkPoint& startPoint() const { return fStartPoint; }
    const SkPoint& endPoint()   const { return fEndPoint;   }

    sk_sp<sksg::Gradient> fGradient;
    size_t                fStopCount;

    virtual void onApply() = 0;

private:
    void apply();

    using INHERITED = SkRefCnt;
};

class LinearGradientAdapter final : public GradientAdapter {
public:
    LinearGradientAdapter(sk_sp<sksg::LinearGradient>, size_t stopCount);

private:
    void onApply() override;

    using INHERITED = GradientAdapter;
};

class RadialGradientAdapter final : public GradientAdapter {
public:
    RadialGradientAdapter(sk_sp<sksg::RadialGradient>, size_t stopCount);

private:
    void onApply() override;

    using INHERITED = GradientAdapter;
};

class TrimEffectAdapter final : public SkRefCnt {
public:
    explicit TrimEffectAdapter(sk_sp<sksg::TrimEffect>);

    ADAPTER_PROPERTY(Start , SkScalar,   0)
    ADAPTER_PROPERTY(End   , SkScalar, 100)
    ADAPTER_PROPERTY(Offset, SkScalar,   0)

private:
    void apply();

    sk_sp<sksg::TrimEffect> fTrimEffect;

    using INHERITED = SkRefCnt;
};

class TextAdapter final : public SkRefCnt {
public:
    explicit TextAdapter(sk_sp<sksg::Group> root);

    ADAPTER_PROPERTY(Text, TextValue, TextValue())

    const sk_sp<sksg::Group>& root() const { return fRoot; }

private:
    void apply();

    sk_sp<sksg::Group> fRoot;
    sk_sp<sksg::Text>  fTextNode;
    sk_sp<sksg::Color> fFillColor,
                       fStrokeColor;
    sk_sp<sksg::Draw>  fFillNode,
                       fStrokeNode;

    bool               fHadFill   : 1, //  - state cached from the prev apply()
                       fHadStroke : 1; //  /

    using INHERITED = SkRefCnt;
};

#undef ADAPTER_PROPERTY

} // namespace skottie

#endif // SkottieAdapter_DEFINED