michael@0: 
michael@0: /*
michael@0:  * Copyright 2008 The Android Open Source Project
michael@0:  *
michael@0:  * Use of this source code is governed by a BSD-style license that can be
michael@0:  * found in the LICENSE file.
michael@0:  */
michael@0: 
michael@0: 
michael@0: #ifndef SkUnitMappers_DEFINED
michael@0: #define SkUnitMappers_DEFINED
michael@0: 
michael@0: #include "SkUnitMapper.h"
michael@0: 
michael@0: /** This discretizes the range [0...1) into N discret values.
michael@0: */
michael@0: class SkDiscreteMapper : public SkUnitMapper {
michael@0: public:
michael@0:     SkDiscreteMapper(int segments);
michael@0:     // override from SkUnitMapper
michael@0:     virtual uint16_t mapUnit16(uint16_t x);
michael@0: 
michael@0:     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkDiscreteMapper)
michael@0: 
michael@0: protected:
michael@0:     SkDiscreteMapper(SkReadBuffer& );
michael@0:     virtual void flatten(SkWriteBuffer&) const SK_OVERRIDE;
michael@0: 
michael@0: private:
michael@0:     int     fSegments;
michael@0:     int32_t fScale;    // computed from fSegments
michael@0: 
michael@0:     typedef SkUnitMapper INHERITED;
michael@0: };
michael@0: 
michael@0: /** This returns cos(x), to simulate lighting a sphere, where 0 maps to the
michael@0:     center of the sphere, and 1 maps to the edge.
michael@0: */
michael@0: class SkCosineMapper : public SkUnitMapper {
michael@0: public:
michael@0:     SkCosineMapper() {}
michael@0:     // override from SkUnitMapper
michael@0:     virtual uint16_t mapUnit16(uint16_t x);
michael@0: 
michael@0:     SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkCosineMapper)
michael@0: 
michael@0: protected:
michael@0:     SkCosineMapper(SkReadBuffer&);
michael@0: 
michael@0: private:
michael@0: 
michael@0:     typedef SkUnitMapper INHERITED;
michael@0: };
michael@0: 
michael@0: #endif