xref: /external/skia/include/effects/SkLayerDrawLooper.h

#ifndef SkLayerDrawLooper_DEFINED
#define SkLayerDrawLooper_DEFINED

#include "SkDrawLooper.h"

struct SkPoint;

class SkLayerDrawLooper : public SkDrawLooper {
public:
            SkLayerDrawLooper();
    virtual ~SkLayerDrawLooper();

    /** Call for each layer you want to add (from top to bottom).
        This returns a paint you can modify, but that ptr is only valid until
        the next call made to this object.
     */
    SkPaint* addLayer(SkScalar dx, SkScalar dy);

    /** Helper for addLayer() which passes (0, 0) for the offset parameters
     */
    SkPaint* addLayer() {
        return this->addLayer(0, 0);
    }

    // overrides from SkDrawLooper
    virtual void init(SkCanvas*, SkPaint*);
    virtual bool next();
    virtual void restore();

    // must be public for Registrar :(
    static SkFlattenable* CreateProc(SkFlattenableReadBuffer& buffer) {
        return SkNEW_ARGS(SkLayerDrawLooper, (buffer));
    }

protected:
    SkLayerDrawLooper(SkFlattenableReadBuffer&);

    // overrides from SkFlattenable
    virtual void flatten(SkFlattenableWriteBuffer& );
    virtual Factory getFactory() { return CreateProc; }

private:
    struct Rec {
        Rec*    fNext;
        SkPaint fPaint;
        SkPoint fOffset;

        static Rec* Reverse(Rec*);
    };
    Rec*    fRecs;
    int     fCount;

    struct Iter {
        SkPaint     fSavedPaint;
        SkPaint*    fPaint;
        SkCanvas*   fCanvas;
        Rec*        fRec;
    };
    Iter    fIter;

    class MyRegistrar : public SkFlattenable::Registrar {
    public:
        MyRegistrar();
    };

    typedef SkDrawLooper INHERITED;
};


#endif