SkLayerDrawLooper.h revision 8a1c16ff38322f0210116fa7293eb8817c7e477e 
1#ifndef SkLayerDrawLooper_DEFINED
2#define SkLayerDrawLooper_DEFINED
3
4#include "SkDrawLooper.h"
5
6struct SkPoint;
7
8class SkLayerDrawLooper : public SkDrawLooper {
9public:
10            SkLayerDrawLooper();
11    virtual ~SkLayerDrawLooper();
12
13    /** Call for each layer you want to add (from top to bottom).
14        This returns a paint you can modify, but that ptr is only valid until
15        the next call made to this object.
16     */
17    SkPaint* addLayer(SkScalar dx, SkScalar dy);
18
19    /** Helper for addLayer() which passes (0, 0) for the offset parameters
20     */
21    SkPaint* addLayer() {
22        return this->addLayer(0, 0);
23    }
24
25    // overrides from SkDrawLooper
26    virtual void init(SkCanvas*, SkPaint*);
27    virtual bool next();
28    virtual void restore();
29
30    // must be public for Registrar :(
31    static SkFlattenable* CreateProc(SkFlattenableReadBuffer& buffer) {
32        return SkNEW_ARGS(SkLayerDrawLooper, (buffer));
33    }
34
35protected:
36    SkLayerDrawLooper(SkFlattenableReadBuffer&);
37
38    // overrides from SkFlattenable
39    virtual void flatten(SkFlattenableWriteBuffer& );
40    virtual Factory getFactory() { return CreateProc; }
41
42private:
43    struct Rec {
44        Rec*    fNext;
45        SkPaint fPaint;
46        SkPoint fOffset;
47
48        static Rec* Reverse(Rec*);
49    };
50    Rec*    fRecs;
51    int     fCount;
52
53    struct Iter {
54        SkPaint     fSavedPaint;
55        SkPaint*    fPaint;
56        SkCanvas*   fCanvas;
57        Rec*        fRec;
58    };
59    Iter    fIter;
60
61    class MyRegistrar : public SkFlattenable::Registrar {
62    public:
63        MyRegistrar();
64    };
65
66    typedef SkDrawLooper INHERITED;
67};
68
69
70#endif
71