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      1 /*
      2  * Copyright (C) 2006 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #ifndef Sk2DPathEffect_DEFINED
     18 #define Sk2DPathEffect_DEFINED
     19 
     20 #include "SkPathEffect.h"
     21 #include "SkMatrix.h"
     22 
     23 //  This class is not exported to java.
     24 class Sk2DPathEffect : public SkPathEffect {
     25 public:
     26     Sk2DPathEffect(const SkMatrix& mat);
     27 
     28     // overrides
     29     //  This method is not exported to java.
     30     virtual bool    filterPath(SkPath* dst, const SkPath& src, SkScalar* width);
     31 
     32     // overrides from SkFlattenable
     33     //  This method is not exported to java.
     34     virtual void    flatten(SkFlattenableWriteBuffer&);
     35 
     36     //  This method is not exported to java.
     37        virtual Factory getFactory();
     38 
     39 protected:
     40     /** New virtual, to be overridden by subclasses.
     41         This is called once from filterPath, and provides the
     42         uv parameter bounds for the path. Subsequent calls to
     43         next() will receive u and v values within these bounds,
     44         and then a call to end() will signal the end of processing.
     45     */
     46     virtual void begin(const SkIRect& uvBounds, SkPath* dst);
     47     virtual void next(const SkPoint& loc, int u, int v, SkPath* dst);
     48     virtual void end(SkPath* dst);
     49 
     50     /** Low-level virtual called per span of locations in the u-direction.
     51         The default implementation calls next() repeatedly with each
     52         location.
     53     */
     54     virtual void nextSpan(int u, int v, int ucount, SkPath* dst);
     55 
     56     const SkMatrix& getMatrix() const { return fMatrix; }
     57 
     58     // protected so that subclasses can call this during unflattening
     59     Sk2DPathEffect(SkFlattenableReadBuffer&);
     60 
     61 private:
     62     SkMatrix    fMatrix, fInverse;
     63     // illegal
     64     Sk2DPathEffect(const Sk2DPathEffect&);
     65     Sk2DPathEffect& operator=(const Sk2DPathEffect&);
     66 
     67     static SkFlattenable* CreateProc(SkFlattenableReadBuffer&);
     68 
     69     friend class Sk2DPathEffectBlitter;
     70     typedef SkPathEffect INHERITED;
     71 };
     72 
     73 #endif
     74