reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame^] | 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 | */ |
| 24 | class SkDiscreteMapper : public SkUnitMapper { |
| 25 | public: |
| 26 | SkDiscreteMapper(int segments); |
| 27 | // override from SkUnitMapper |
| 28 | virtual uint16_t mapUnit16(uint16_t x); |
| 29 | |
| 30 | protected: |
| 31 | SkDiscreteMapper(SkFlattenableReadBuffer& ); |
| 32 | // overrides from SkFlattenable |
| 33 | virtual void flatten(SkFlattenableWriteBuffer& ); |
| 34 | virtual Factory getFactory(); |
| 35 | private: |
| 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 | */ |
| 47 | class SkCosineMapper : public SkUnitMapper { |
| 48 | public: |
| 49 | SkCosineMapper() {} |
| 50 | // override from SkUnitMapper |
| 51 | virtual uint16_t mapUnit16(uint16_t x); |
| 52 | |
| 53 | protected: |
| 54 | SkCosineMapper(SkFlattenableReadBuffer&); |
| 55 | // overrides from SkFlattenable |
| 56 | virtual Factory getFactory(); |
| 57 | |
| 58 | private: |
| 59 | static SkFlattenable* Create(SkFlattenableReadBuffer&); |
| 60 | |
| 61 | typedef SkUnitMapper INHERITED; |
| 62 | }; |
| 63 | |
| 64 | #endif |
| 65 | |