1/*
2 * Copyright (C) 2006 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef SkLayerRasterizer_DEFINED
18#define SkLayerRasterizer_DEFINED
19
20#include "SkRasterizer.h"
21#include "SkDeque.h"
22#include "SkScalar.h"
23
24class SkPaint;
25
26class SkLayerRasterizer : public SkRasterizer {
27public:
28            SkLayerRasterizer();
29    virtual ~SkLayerRasterizer();
30
31    void addLayer(const SkPaint& paint)
32    {
33        this->addLayer(paint, 0, 0);
34    }
35
36	/**	Add a new layer (above any previous layers) to the rasterizer.
37		The layer will extract those fields that affect the mask from
38		the specified paint, but will not retain a reference to the paint
39		object itself, so it may be reused without danger of side-effects.
40	*/
41    void addLayer(const SkPaint& paint, SkScalar dx, SkScalar dy);
42
43    // overrides from SkFlattenable
44    virtual Factory getFactory();
45    virtual void    flatten(SkFlattenableWriteBuffer&);
46
47protected:
48    SkLayerRasterizer(SkFlattenableReadBuffer&);
49
50    // override from SkRasterizer
51    virtual bool onRasterize(const SkPath& path, const SkMatrix& matrix,
52                             const SkIRect* clipBounds,
53                             SkMask* mask, SkMask::CreateMode mode);
54
55private:
56    SkDeque fLayers;
57
58    static SkFlattenable* CreateProc(SkFlattenableReadBuffer&);
59
60    typedef SkRasterizer INHERITED;
61};
62
63#endif
64