SkLayerRasterizer.h revision 6806fe87e0b39e283291c1a1c7d1d864230aa2aa 
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 SK_API 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    SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkLayerRasterizer)
36
37protected:
38    SkLayerRasterizer(SkFlattenableReadBuffer&);
39    virtual void flatten(SkFlattenableWriteBuffer&) const SK_OVERRIDE;
40
41    // override from SkRasterizer
42    virtual bool onRasterize(const SkPath& path, const SkMatrix& matrix,
43                             const SkIRect* clipBounds,
44                             SkMask* mask, SkMask::CreateMode mode);
45
46private:
47    SkDeque fLayers;
48
49    typedef SkRasterizer INHERITED;
50};
51
52#endif
53