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      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 Sk2DPathEffect_DEFINED
      9 #define Sk2DPathEffect_DEFINED
     10 
     11 #include "SkPath.h"
     12 #include "SkPathEffect.h"
     13 #include "SkMatrix.h"
     14 
     15 class SK_API Sk2DPathEffect : public SkPathEffect {
     16 public:
     17     Sk2DPathEffect(const SkMatrix& mat);
     18 
     19     virtual bool filterPath(SkPath*, const SkPath&,
     20                             SkStrokeRec*, const SkRect*) const SK_OVERRIDE;
     21 
     22     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(Sk2DPathEffect)
     23 
     24 protected:
     25     /** New virtual, to be overridden by subclasses.
     26         This is called once from filterPath, and provides the
     27         uv parameter bounds for the path. Subsequent calls to
     28         next() will receive u and v values within these bounds,
     29         and then a call to end() will signal the end of processing.
     30     */
     31     virtual void begin(const SkIRect& uvBounds, SkPath* dst) const;
     32     virtual void next(const SkPoint& loc, int u, int v, SkPath* dst) const;
     33     virtual void end(SkPath* dst) const;
     34 
     35     /** Low-level virtual called per span of locations in the u-direction.
     36         The default implementation calls next() repeatedly with each
     37         location.
     38     */
     39     virtual void nextSpan(int u, int v, int ucount, SkPath* dst) const;
     40 
     41     const SkMatrix& getMatrix() const { return fMatrix; }
     42 
     43     // protected so that subclasses can call this during unflattening
     44     Sk2DPathEffect(SkFlattenableReadBuffer&);
     45     virtual void flatten(SkFlattenableWriteBuffer&) const SK_OVERRIDE;
     46 
     47 private:
     48     SkMatrix    fMatrix, fInverse;
     49     bool        fMatrixIsInvertible;
     50 
     51     // illegal
     52     Sk2DPathEffect(const Sk2DPathEffect&);
     53     Sk2DPathEffect& operator=(const Sk2DPathEffect&);
     54 
     55     friend class Sk2DPathEffectBlitter;
     56     typedef SkPathEffect INHERITED;
     57 };
     58 
     59 class SK_API SkLine2DPathEffect : public Sk2DPathEffect {
     60 public:
     61     SkLine2DPathEffect(SkScalar width, const SkMatrix& matrix)
     62     : Sk2DPathEffect(matrix), fWidth(width) {}
     63 
     64     virtual bool filterPath(SkPath* dst, const SkPath& src,
     65                             SkStrokeRec*, const SkRect*) const SK_OVERRIDE;
     66 
     67     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkLine2DPathEffect)
     68 
     69 protected:
     70     virtual void nextSpan(int u, int v, int ucount, SkPath*) const SK_OVERRIDE;
     71 
     72     SkLine2DPathEffect(SkFlattenableReadBuffer&);
     73 
     74     virtual void flatten(SkFlattenableWriteBuffer&) const SK_OVERRIDE;
     75 
     76 private:
     77     SkScalar fWidth;
     78 
     79     typedef Sk2DPathEffect INHERITED;
     80 };
     81 
     82 class SK_API SkPath2DPathEffect : public Sk2DPathEffect {
     83 public:
     84     /**
     85      *  Stamp the specified path to fill the shape, using the matrix to define
     86      *  the latice.
     87      */
     88     SkPath2DPathEffect(const SkMatrix&, const SkPath&);
     89 
     90     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkPath2DPathEffect)
     91 
     92 protected:
     93     SkPath2DPathEffect(SkFlattenableReadBuffer& buffer);
     94     virtual void flatten(SkFlattenableWriteBuffer&) const SK_OVERRIDE;
     95 
     96     virtual void next(const SkPoint&, int u, int v, SkPath*) const SK_OVERRIDE;
     97 
     98 private:
     99     SkPath  fPath;
    100 
    101     typedef Sk2DPathEffect INHERITED;
    102 };
    103 
    104 #endif
    105