SkDiscretePathEffectImpl Class Reference

Inheritance diagram for SkDiscretePathEffectImpl:

Public Member Functions
	SkDiscretePathEffectImpl (SkScalar segLength, SkScalar deviation, uint32_t seedAssist)
bool	onFilterPath (SkPath *dst, const SkPath &src, SkStrokeRec *rec, const SkRect *, const SkMatrix &) const override
bool	computeFastBounds (SkRect *bounds) const override
void	flatten (SkWriteBuffer &buffer) const override
Factory	getFactory () const override
const char *	getTypeName () const override
Public Member Functions inherited from SkPathEffectBase
	SkPathEffectBase ()
bool	asPoints (PointData *results, const SkPath &src, const SkStrokeRec &, const SkMatrix &, const SkRect *cullR) const
SkFlattenable::Type	getFlattenableType () const override
virtual bool	onNeedsCTM () const
virtual bool	onAsPoints (PointData *, const SkPath &, const SkStrokeRec &, const SkMatrix &, const SkRect *) const
virtual DashType	onAsADash (DashInfo *) const
Public Member Functions inherited from SkPathEffect
DashType	asADash (DashInfo *info) const
bool	filterPath (SkPath *dst, const SkPath &src, SkStrokeRec *, const SkRect *cullR) const
bool	filterPath (SkPath *dst, const SkPath &src, SkStrokeRec *, const SkRect *cullR, const SkMatrix &ctm) const
bool	needsCTM () const
Public Member Functions inherited from SkFlattenable
	SkFlattenable ()
sk_sp< SkData >	serialize (const SkSerialProcs *=nullptr) const
size_t	serialize (void *memory, size_t memory_size, const SkSerialProcs *=nullptr) const
Public Member Functions inherited from SkRefCntBase
	SkRefCntBase ()
virtual	~SkRefCntBase ()
bool	unique () const
void	ref () const
void	unref () const

Static Public Member Functions
static sk_sp< SkFlattenable >	CreateProc (SkReadBuffer &buffer)
Static Public Member Functions inherited from SkPathEffectBase
static sk_sp< SkPathEffect >	Deserialize (const void *data, size_t size, const SkDeserialProcs *procs=nullptr)
static void	RegisterFlattenables ()
Static Public Member Functions inherited from SkPathEffect
static sk_sp< SkPathEffect >	MakeSum (sk_sp< SkPathEffect > first, sk_sp< SkPathEffect > second)
static sk_sp< SkPathEffect >	MakeCompose (sk_sp< SkPathEffect > outer, sk_sp< SkPathEffect > inner)
static SkFlattenable::Type	GetFlattenableType ()
static sk_sp< SkPathEffect >	Deserialize (const void *data, size_t size, const SkDeserialProcs *procs=nullptr)
Static Public Member Functions inherited from SkFlattenable
static Factory	NameToFactory (const char name[])
static const char *	FactoryToName (Factory)
static void	Register (const char name[], Factory)
static sk_sp< SkFlattenable >	Deserialize (Type, const void *data, size_t length, const SkDeserialProcs *procs=nullptr)

Additional Inherited Members
Public Types inherited from SkPathEffect
enum	DashType { kNone_DashType , kDash_DashType }
Public Types inherited from SkFlattenable
enum	Type {   kSkColorFilter_Type , kSkBlender_Type , kSkDrawable_Type , kSkDrawLooper_Type ,   kSkImageFilter_Type , kSkMaskFilter_Type , kSkPathEffect_Type , kSkShader_Type }
typedef sk_sp< SkFlattenable >(*	Factory) (SkReadBuffer &)

Detailed Description

Definition at line 79 of file SkDiscretePathEffect.cpp.

Constructor & Destructor Documentation

SkDiscretePathEffectImpl()

SkDiscretePathEffectImpl::SkDiscretePathEffectImpl ( SkScalar  segLength, SkScalar  deviation, uint32_t  seedAssist  )

inline

Definition at line 81 of file SkDiscretePathEffect.cpp.

        : fSegLength(segLength), fPerterb(deviation), fSeedAssist(seedAssist)
    {
        SkASSERT(SkIsFinite(segLength));
        SkASSERT(SkIsFinite(deviation));
        SkASSERT(segLength > SK_ScalarNearlyZero);
    }

Member Function Documentation

computeFastBounds()

bool SkDiscretePathEffectImpl::computeFastBounds ( SkRect *  bounds ) const

inlineoverridevirtual

Implements SkPathEffectBase.

Definition at line 144 of file SkDiscretePathEffect.cpp.

                                                          {
        if (bounds) {
            SkScalar maxOutset = SkScalarAbs(fPerterb);
            bounds->outset(maxOutset, maxOutset);
        }
        return true;
    }

CreateProc()

static sk_sp< SkFlattenable > SkDiscretePathEffectImpl::CreateProc ( SkReadBuffer &  buffer )

inlinestatic

Definition at line 152 of file SkDiscretePathEffect.cpp.

                                                                 {
        SkScalar segLength = buffer.readScalar();
        SkScalar perterb = buffer.readScalar();
        uint32_t seed = buffer.readUInt();
        return SkDiscretePathEffect::Make(segLength, perterb, seed);
    }

flatten()

void SkDiscretePathEffectImpl::flatten ( SkWriteBuffer &  ) const

inlineoverridevirtual

Override this if your subclass needs to record data that it will need to recreate itself from its CreateProc (returned by getFactory()).

DEPRECATED public : will move to protected ... use serialize() instead

Reimplemented from SkFlattenable.

Definition at line 159 of file SkDiscretePathEffect.cpp.

                                                       {
        buffer.writeScalar(fSegLength);
        buffer.writeScalar(fPerterb);
        buffer.writeUInt(fSeedAssist);
    }

getFactory()

Factory SkDiscretePathEffectImpl::getFactory ( ) const

inlineoverridevirtual

Implement this to return a factory function pointer that can be called to recreate your class given a buffer (previously written to by your override of flatten().

Implements SkFlattenable.

Definition at line 165 of file SkDiscretePathEffect.cpp.

{ return CreateProc; }

getTypeName()

const char * SkDiscretePathEffectImpl::getTypeName ( ) const

inlineoverridevirtual

Returns the name of the object's class.

Implements SkFlattenable.

Definition at line 166 of file SkDiscretePathEffect.cpp.

{ return "SkDiscretePathEffect"; }

onFilterPath()

bool SkDiscretePathEffectImpl::onFilterPath ( SkPath *  , const SkPath &  , SkStrokeRec *  , const SkRect *  , const SkMatrix &    ) const

inlineoverridevirtual

Filter the input path.

The CTM parameter is provided for path effects that can use the information. The output of path effects must always be in the original (input) coordinate system, regardless of whether the path effect uses the CTM or not.

Implements SkPathEffectBase.

Definition at line 89 of file SkDiscretePathEffect.cpp.

                                                                     {
        bool doFill = rec->isFillStyle();
 
        SkPathMeasure   meas(src, doFill);
 
        /* Caller may supply their own seed assist, which by default is 0 */
        uint32_t seed = fSeedAssist ^ SkScalarRoundToInt(meas.getLength());
 
        LCGRandom   rand(seed ^ ((seed << 16) | (seed >> 16)));
        SkScalar    scale = fPerterb;
        SkPoint     p;
        SkVector    v;
 
        do {
            SkScalar    length = meas.getLength();
    #if defined(SK_BUILD_FOR_FUZZER)
            if (length > 1000) {
                return false;
            }
    #endif
 
            if (fSegLength * (2 + doFill) > length) {
                meas.getSegment(0, length, dst, true);  // to short for us to mangle
            } else {
                int         n = SkScalarRoundToInt(length / fSegLength);
                constexpr int kMaxReasonableIterations = 100000;
                n = std::min(n, kMaxReasonableIterations);
                SkScalar    delta = length / n;
                SkScalar    distance = 0;
 
                if (meas.isClosed()) {
                    n -= 1;
                    distance += delta/2;
                }
 
                if (meas.getPosTan(distance, &p, &v)) {
                    Perterb(&p, v, rand.nextSScalar1() * scale);
                    dst->moveTo(p);
                }
                while (--n >= 0) {
                    distance += delta;
                    if (meas.getPosTan(distance, &p, &v)) {
                        Perterb(&p, v, rand.nextSScalar1() * scale);
                        dst->lineTo(p);
                    }
                }
                if (meas.isClosed()) {
                    dst->close();
                }
            }
        } while (meas.nextContour());
        return true;
    }

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The documentation for this class was generated from the following file:

• third_party/skia/src/effects/SkDiscretePathEffect.cpp