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*/ 17class SK_API SkDiscretePathEffect : public SkPathEffect { 18public: 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 44protected: 45 SkDiscretePathEffect(SkScalar segLength, 46 SkScalar deviation, 47 uint32_t seedAssist); 48#ifdef SK_SUPPORT_LEGACY_DEEPFLATTENING 49 explicit SkDiscretePathEffect(SkReadBuffer&); 50#endif 51 virtual void flatten(SkWriteBuffer&) const SK_OVERRIDE; 52 53private: 54 SkScalar fSegLength, fPerterb; 55 56 /* Caller-supplied 32 bit seed assist */ 57 uint32_t fSeedAssist; 58 59 typedef SkPathEffect INHERITED; 60}; 61 62#endif 63