1 /* 2 * Copyright 2006 The Android Open Source Project 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #ifndef SkDiscretePathEffect_DEFINED 9 #define SkDiscretePathEffect_DEFINED 10 11 #include "SkPathEffect.h" 12 13 /** \class SkDiscretePathEffect 14 15 This path effect chops a path into discrete segments, and randomly displaces them. 16 */ 17 class SK_API SkDiscretePathEffect : public SkPathEffect { 18 public: 19 /** Break the path into segments of segLength length, and randomly move the endpoints 20 away from the original path by a maximum of deviation. 21 Note: works on filled or framed paths 22 23 @param seedAssist This is a caller-supplied seedAssist that modifies 24 the seed value that is used to randomize the path 25 segments' endpoints. If not supplied it defaults to 0, 26 in which case filtering a path multiple times will 27 result in the same set of segments (this is useful for 28 testing). If a caller does not want this behaviour 29 they can pass in a different seedAssist to get a 30 different set of path segments. 31 */ 32 static SkDiscretePathEffect* Create(SkScalar segLength, 33 SkScalar deviation, 34 uint32_t seedAssist=0) { 35 return SkNEW_ARGS(SkDiscretePathEffect, 36 (segLength, deviation, seedAssist)); 37 } 38 39 virtual bool filterPath(SkPath* dst, const SkPath& src, 40 SkStrokeRec*, const SkRect*) const SK_OVERRIDE; 41 42 SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkDiscretePathEffect) 43 44 protected: 45 SkDiscretePathEffect(SkScalar segLength, 46 SkScalar deviation, 47 uint32_t seedAssist); 48 explicit SkDiscretePathEffect(SkReadBuffer&); 49 virtual void flatten(SkWriteBuffer&) const SK_OVERRIDE; 50 51 private: 52 SkScalar fSegLength, fPerterb; 53 54 /* Caller-supplied 32 bit seed assist */ 55 uint32_t fSeedAssist; 56 57 typedef SkPathEffect INHERITED; 58 }; 59 60 #endif 61