1/*
2 * Copyright (C) 2008 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 SkUnitMappers_DEFINED
18#define SkUnitMappers_DEFINED
19
20#include "SkUnitMapper.h"
21
22/** This discretizes the range [0...1) into N discret values.
23*/
24class SkDiscreteMapper : public SkUnitMapper {
25public:
26    SkDiscreteMapper(int segments);
27    // override from SkUnitMapper
28    virtual uint16_t mapUnit16(uint16_t x);
29
30protected:
31    SkDiscreteMapper(SkFlattenableReadBuffer& );
32    // overrides from SkFlattenable
33    virtual void flatten(SkFlattenableWriteBuffer& );
34    virtual Factory getFactory();
35private:
36    int     fSegments;
37    SkFract fScale;    // computed from fSegments
38
39    static SkFlattenable* Create(SkFlattenableReadBuffer& buffer);
40
41    typedef SkUnitMapper INHERITED;
42};
43
44/** This returns cos(x), to simulate lighting a sphere, where 0 maps to the
45    center of the sphere, and 1 maps to the edge.
46*/
47class SkCosineMapper : public SkUnitMapper {
48public:
49    SkCosineMapper() {}
50    // override from SkUnitMapper
51    virtual uint16_t mapUnit16(uint16_t x);
52
53protected:
54    SkCosineMapper(SkFlattenableReadBuffer&);
55    // overrides from SkFlattenable
56    virtual Factory getFactory();
57
58private:
59    static SkFlattenable* Create(SkFlattenableReadBuffer&);
60
61    typedef SkUnitMapper INHERITED;
62};
63
64#endif
65
66