1 /*
2  * Copyright 2017 Google Inc.
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 SkClipStackDevice_DEFINED
9 #define SkClipStackDevice_DEFINED
10 
11 #include "SkClipStack.h"
12 #include "SkDevice.h"
13 
14 class SkClipStackDevice : public SkBaseDevice {
15 public:
SkClipStackDevice(const SkImageInfo & info,const SkSurfaceProps & props)16     SkClipStackDevice(const SkImageInfo& info, const SkSurfaceProps& props)
17         : SkBaseDevice(info, props)
18         , fClipStack(fStorage, sizeof(fStorage))
19     {}
20 
cs()21     SkClipStack& cs() { return fClipStack; }
cs()22     const SkClipStack& cs() const { return fClipStack; }
23 
24     SkIRect devClipBounds() const;
25 
26 protected:
27     void onSave() override;
28     void onRestore() override;
29     void onClipRect(const SkRect& rect, SkClipOp, bool aa) override;
30     void onClipRRect(const SkRRect& rrect, SkClipOp, bool aa) override;
31     void onClipPath(const SkPath& path, SkClipOp, bool aa) override;
32     void onClipRegion(const SkRegion& deviceRgn, SkClipOp) override;
33     void onSetDeviceClipRestriction(SkIRect* mutableClipRestriction) override;
34     bool onClipIsAA() const override;
35     void onAsRgnClip(SkRegion*) const override;
36     ClipType onGetClipType() const override;
37 
38 private:
39     enum {
40         kPreallocCount = 16 // empirically determined, adjust as needed to reduce mallocs
41     };
42     intptr_t fStorage[kPreallocCount * sizeof(SkClipStack::Element) / sizeof(intptr_t)];
43     SkClipStack fClipStack;
44 
45     typedef SkBaseDevice INHERITED;
46 };
47 
48 #endif
49