skia2/include/utils/SkUnitMappers.h

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/*
* Copyright (C) 2008 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef SkUnitMappers_DEFINED
#define SkUnitMappers_DEFINED
#include "SkUnitMapper.h"
/** This discretizes the range [0...1) into N discret values.
*/
class SkDiscreteMapper : public SkUnitMapper {
public:
SkDiscreteMapper(int segments);
// override from SkUnitMapper
virtual uint16_t mapUnit16(uint16_t x);
protected:
SkDiscreteMapper(SkFlattenableReadBuffer& );
// overrides from SkFlattenable
virtual void flatten(SkFlattenableWriteBuffer& );
virtual Factory getFactory();
private:
int fSegments;
SkFract fScale; // computed from fSegments
static SkFlattenable* Create(SkFlattenableReadBuffer& buffer);
typedef SkUnitMapper INHERITED;
};
/** This returns cos(x), to simulate lighting a sphere, where 0 maps to the
center of the sphere, and 1 maps to the edge.
*/
class SkCosineMapper : public SkUnitMapper {
public:
SkCosineMapper() {}
// override from SkUnitMapper
virtual uint16_t mapUnit16(uint16_t x);
protected:
SkCosineMapper(SkFlattenableReadBuffer&);
// overrides from SkFlattenable
virtual Factory getFactory();
private:
static SkFlattenable* Create(SkFlattenableReadBuffer&);
typedef SkUnitMapper INHERITED;
};
#endif