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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 Sk1DPathEffect_DEFINED
      9 #define Sk1DPathEffect_DEFINED
     10 
     11 #include "SkPathEffect.h"
     12 #include "SkPath.h"
     13 
     14 class SkPathMeasure;
     15 
     16 // This class is not exported to java.
     17 class SK_API Sk1DPathEffect : public SkPathEffect {
     18 public:
     19     virtual bool filterPath(SkPath* dst, const SkPath& src,
     20                             SkStrokeRec*, const SkRect*) const override;
     21 
     22 protected:
     23     /** Called at the start of each contour, returns the initial offset
     24         into that contour.
     25     */
     26     virtual SkScalar begin(SkScalar contourLength) const = 0;
     27     /** Called with the current distance along the path, with the current matrix
     28         for the point/tangent at the specified distance.
     29         Return the distance to travel for the next call. If return <= 0, then that
     30         contour is done.
     31     */
     32     virtual SkScalar next(SkPath* dst, SkScalar dist, SkPathMeasure&) const = 0;
     33 
     34 #ifdef SK_BUILD_FOR_ANDROID_FRAMEWORK
     35     bool exposedInAndroidJavaAPI() const override { return true; }
     36 #endif
     37 
     38 private:
     39     typedef SkPathEffect INHERITED;
     40 };
     41 
     42 class SK_API SkPath1DPathEffect : public Sk1DPathEffect {
     43 public:
     44     enum Style {
     45         kTranslate_Style,   // translate the shape to each position
     46         kRotate_Style,      // rotate the shape about its center
     47         kMorph_Style,       // transform each point, and turn lines into curves
     48 
     49         kLastEnum_Style = kMorph_Style,
     50     };
     51 
     52     /** Dash by replicating the specified path.
     53         @param path The path to replicate (dash)
     54         @param advance The space between instances of path
     55         @param phase distance (mod advance) along path for its initial position
     56         @param style how to transform path at each point (based on the current
     57                      position and tangent)
     58     */
     59     static SkPathEffect* Create(const SkPath& path, SkScalar advance, SkScalar phase, Style);
     60 
     61     virtual bool filterPath(SkPath*, const SkPath&,
     62                             SkStrokeRec*, const SkRect*) const override;
     63 
     64     SK_TO_STRING_OVERRIDE()
     65     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkPath1DPathEffect)
     66 
     67 protected:
     68     SkPath1DPathEffect(const SkPath& path, SkScalar advance, SkScalar phase, Style);
     69     void flatten(SkWriteBuffer&) const override;
     70 
     71     // overrides from Sk1DPathEffect
     72     SkScalar begin(SkScalar contourLength) const override;
     73     SkScalar next(SkPath*, SkScalar, SkPathMeasure&) const override;
     74 
     75 private:
     76     SkPath      fPath;          // copied from constructor
     77     SkScalar    fAdvance;       // copied from constructor
     78     SkScalar    fInitialOffset; // computed from phase
     79     Style       fStyle;         // copied from constructor
     80 
     81     typedef Sk1DPathEffect INHERITED;
     82 };
     83 
     84 #endif
     85