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      1 
      2 /*
      3  * Copyright 2011 The Android Open Source Project
      4  *
      5  * Use of this source code is governed by a BSD-style license that can be
      6  * found in the LICENSE file.
      7  */
      8 
      9 
     10 #ifndef SkDrawFilter_DEFINED
     11 #define SkDrawFilter_DEFINED
     12 
     13 #include "SkRefCnt.h"
     14 
     15 class SkCanvas;
     16 class SkPaint;
     17 
     18 /**
     19  *  Right before something is being draw, filter() is called with the
     20  *  paint. The filter may modify the paint as it wishes, which will then be
     21  *  used for the actual drawing. Note: this modification only lasts for the
     22  *  current draw, as a temporary copy of the paint is used.
     23  */
     24 class SK_API SkDrawFilter : public SkRefCnt {
     25 public:
     26     SK_DECLARE_INST_COUNT(SkDrawFilter)
     27 
     28     enum Type {
     29         kPaint_Type,
     30         kPoint_Type,
     31         kLine_Type,
     32         kBitmap_Type,
     33         kRect_Type,
     34         kRRect_Type,
     35         kOval_Type,
     36         kPath_Type,
     37         kText_Type,
     38     };
     39 
     40     enum {
     41         kTypeCount = kText_Type + 1
     42     };
     43 
     44     /**
     45      *  Called with the paint that will be used to draw the specified type.
     46      *  The implementation may modify the paint as they wish. If filter()
     47      *  returns false, the draw will be skipped.
     48      */
     49     virtual bool filter(SkPaint*, Type) = 0;
     50 
     51 private:
     52     typedef SkRefCnt INHERITED;
     53 };
     54 
     55 #endif
     56