SkLayerRasterizer.h revision 43e9f20f4b5eecb2335e26461b5c4c84f2e3bcd2 
1
2/*
3 * Copyright 2006 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 SkLayerRasterizer_DEFINED
11#define SkLayerRasterizer_DEFINED
12
13#include "SkRasterizer.h"
14#include "SkDeque.h"
15#include "SkScalar.h"
16
17class SkPaint;
18
19class SkLayerRasterizer : public SkRasterizer {
20public:
21            SkLayerRasterizer();
22    virtual ~SkLayerRasterizer();
23
24    void addLayer(const SkPaint& paint) {
25        this->addLayer(paint, 0, 0);
26    }
27
28	/**	Add a new layer (above any previous layers) to the rasterizer.
29		The layer will extract those fields that affect the mask from
30		the specified paint, but will not retain a reference to the paint
31		object itself, so it may be reused without danger of side-effects.
32	*/
33    void addLayer(const SkPaint& paint, SkScalar dx, SkScalar dy);
34
35    // overrides from SkFlattenable
36    virtual Factory getFactory();
37    virtual void    flatten(SkFlattenableWriteBuffer&);
38
39    static SkFlattenable* CreateProc(SkFlattenableReadBuffer&);
40
41protected:
42    SkLayerRasterizer(SkFlattenableReadBuffer&);
43
44    // override from SkRasterizer
45    virtual bool onRasterize(const SkPath& path, const SkMatrix& matrix,
46                             const SkIRect* clipBounds,
47                             SkMask* mask, SkMask::CreateMode mode);
48
49private:
50    SkDeque fLayers;
51
52    typedef SkRasterizer INHERITED;
53};
54
55#endif
56