Skia
2DGraphicsLibrary
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This path effect chops a path into discrete segments, and randomly displaces them. More...
#include <SkDiscretePathEffect.h>
Public Member Functions | |
virtual bool | filterPath (SkPath *dst, const SkPath &src, SkStrokeRec *, const SkRect *) const override |
Given a src path (input) and a stroke-rec (input and output), apply this effect to the src path, returning the new path in dst, and return true. More... | |
Public Member Functions inherited from SkPathEffect | |
virtual void | computeFastBounds (SkRect *dst, const SkRect &src) const |
Compute a conservative bounds for its effect, given the src bounds. More... | |
virtual bool | asPoints (PointData *results, const SkPath &src, const SkStrokeRec &, const SkMatrix &, const SkRect *cullR) const |
Does applying this path effect to 'src' yield a set of points? If so, optionally return the points in 'results'. | |
virtual DashType | asADash (DashInfo *info) const |
Public Member Functions inherited from SkFlattenable | |
virtual Factory | getFactory () const =0 |
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(). | |
virtual const char * | getTypeName () const |
Returns the name of the object's class. More... | |
Public Member Functions inherited from SkRefCntBase | |
SkRefCntBase () | |
Default construct, initializing the reference count to 1. | |
virtual | ~SkRefCntBase () |
Destruct, asserting that the reference count is 1. | |
int32_t | getRefCnt () const |
Return the reference count. More... | |
void | validate () const |
bool | unique () const |
May return true if the caller is the only owner. More... | |
void | ref () const |
Increment the reference count. More... | |
void | unref () const |
Decrement the reference count. More... | |
Static Public Member Functions | |
static sk_sp< SkPathEffect > | Make (SkScalar segLength, SkScalar dev, uint32_t seedAssist=0) |
Break the path into segments of segLength length, and randomly move the endpoints away from the original path by a maximum of deviation. More... | |
Static Public Member Functions inherited from SkPathEffect | |
static sk_sp< SkPathEffect > | MakeSum (sk_sp< SkPathEffect > first, sk_sp< SkPathEffect > second) |
Returns a patheffect that apples each effect (first and second) to the original path, and returns a path with the sum of these. More... | |
static sk_sp< SkPathEffect > | MakeCompose (sk_sp< SkPathEffect > outer, sk_sp< SkPathEffect > inner) |
Returns a patheffect that applies the inner effect to the path, and then applies the outer effect to the result of the inner's. More... | |
Static Public Member Functions inherited from SkFlattenable | |
static Factory | NameToFactory (const char name[]) |
static const char * | FactoryToName (Factory) |
static bool | NameToType (const char name[], Type *type) |
static void | Register (const char name[], Factory, Type) |
Protected Member Functions | |
SkDiscretePathEffect (SkScalar segLength, SkScalar deviation, uint32_t seedAssist) | |
void | flatten (SkWriteBuffer &) const override |
Override this if your subclass needs to record data that it will need to recreate itself from its CreateProc (returned by getFactory()). | |
Protected Member Functions inherited from SkRefCntBase | |
void | internal_dispose_restore_refcnt_to_1 () const |
Allow subclasses to call this if they've overridden internal_dispose so they can reset fRefCnt before the destructor is called or if they choose not to call the destructor (e.g. More... | |
Private Types | |
typedef SkPathEffect | INHERITED |
Private Attributes | |
SkScalar | fSegLength |
SkScalar | fPerterb |
uint32_t | fSeedAssist |
Additional Inherited Members | |
Public Types inherited from SkPathEffect | |
enum | DashType { kNone_DashType, kDash_DashType } |
If the PathEffect can be represented as a dash pattern, asADash will return kDash_DashType and None otherwise. More... | |
Public Types inherited from SkFlattenable | |
enum | Type { kSkColorFilter_Type, kSkDrawable_Type, kSkDrawLooper_Type, kSkImageFilter_Type, kSkMaskFilter_Type, kSkPathEffect_Type, kSkPixelRef_Type, kSkRasterizer_Type, kSkShaderBase_Type, kSkUnused_Type, kSkUnused_Xfermode_Type, kSkNormalSource_Type } |
typedef sk_sp< SkFlattenable >(* | Factory )(SkReadBuffer &) |
This path effect chops a path into discrete segments, and randomly displaces them.
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overridevirtual |
Given a src path (input) and a stroke-rec (input and output), apply this effect to the src path, returning the new path in dst, and return true.
If this effect cannot be applied, return false and ignore dst and stroke-rec.
The stroke-rec specifies the initial request for stroking (if any). The effect can treat this as input only, or it can choose to change the rec as well. For example, the effect can decide to change the stroke's width or join, or the effect can change the rec from stroke to fill (or fill to stroke) in addition to returning a new (dst) path.
If this method returns true, the caller will apply (as needed) the resulting stroke-rec to dst and then draw.
Implements SkPathEffect.
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static |
Break the path into segments of segLength length, and randomly move the endpoints away from the original path by a maximum of deviation.
Note: works on filled or framed paths
seedAssist | This is a caller-supplied seedAssist that modifies the seed value that is used to randomize the path segments' endpoints. If not supplied it defaults to 0, in which case filtering a path multiple times will result in the same set of segments (this is useful for testing). If a caller does not want this behaviour they can pass in a different seedAssist to get a different set of path segments. |