1
2/*
3 * Copyright 2008 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 SkUnitMappers_DEFINED
11#define SkUnitMappers_DEFINED
12
13#include "SkUnitMapper.h"
14
15/** This discretizes the range [0...1) into N discret values.
16*/
17class SkDiscreteMapper : public SkUnitMapper {
18public:
19    SkDiscreteMapper(int segments);
20    // override from SkUnitMapper
21    virtual uint16_t mapUnit16(uint16_t x);
22
23protected:
24    SkDiscreteMapper(SkFlattenableReadBuffer& );
25    // overrides from SkFlattenable
26    virtual void flatten(SkFlattenableWriteBuffer& );
27    virtual Factory getFactory();
28private:
29    int     fSegments;
30    SkFract fScale;    // computed from fSegments
31
32    static SkFlattenable* Create(SkFlattenableReadBuffer& buffer);
33
34    typedef SkUnitMapper INHERITED;
35};
36
37/** This returns cos(x), to simulate lighting a sphere, where 0 maps to the
38    center of the sphere, and 1 maps to the edge.
39*/
40class SkCosineMapper : public SkUnitMapper {
41public:
42    SkCosineMapper() {}
43    // override from SkUnitMapper
44    virtual uint16_t mapUnit16(uint16_t x);
45
46protected:
47    SkCosineMapper(SkFlattenableReadBuffer&);
48    // overrides from SkFlattenable
49    virtual Factory getFactory();
50
51private:
52    static SkFlattenable* Create(SkFlattenableReadBuffer&);
53
54    typedef SkUnitMapper INHERITED;
55};
56
57#endif
58
59