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 "include/core/SkFlattenable.h"
12#include "include/core/SkPathEffect.h"
13
14/** \class SkDiscretePathEffect
15
16 This path effect chops a path into discrete segments, and randomly displaces them.
17*/
18class SK_API SkDiscretePathEffect : public SkPathEffect {
19public:
20 /** Break the path into segments of segLength length, and randomly move the endpoints
21 away from the original path by a maximum of deviation.
22 Note: works on filled or framed paths
23
24 @param seedAssist This is a caller-supplied seedAssist that modifies
25 the seed value that is used to randomize the path
26 segments' endpoints. If not supplied it defaults to 0,
27 in which case filtering a path multiple times will
28 result in the same set of segments (this is useful for
29 testing). If a caller does not want this behaviour
30 they can pass in a different seedAssist to get a
31 different set of path segments.
32 */
33 static sk_sp<SkPathEffect> Make(SkScalar segLength, SkScalar dev, uint32_t seedAssist = 0);
34
35protected:
36 SkDiscretePathEffect(SkScalar segLength,
37 SkScalar deviation,
38 uint32_t seedAssist);
39 void flatten(SkWriteBuffer&) const override;
40 bool onFilterPath(SkPath* dst, const SkPath& src, SkStrokeRec*, const SkRect*) const override;
41
42private:
43 SK_FLATTENABLE_HOOKS(SkDiscretePathEffect)
44
45 SkScalar fSegLength, fPerterb;
46
47 /* Caller-supplied 32 bit seed assist */
48 uint32_t fSeedAssist;
49
50 typedef SkPathEffect INHERITED;
51};
52
53#endif
54