| /* |
| * Copyright 2006 The Android Open Source Project |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #ifndef SkTableMaskFilter_DEFINED |
| #define SkTableMaskFilter_DEFINED |
| |
| #include "SkMaskFilter.h" |
| #include "SkScalar.h" |
| |
| /** \class SkTableMaskFilter |
| |
| Applies a table lookup on each of the alpha values in the mask. |
| Helper methods create some common tables (e.g. gamma, clipping) |
| */ |
| class SK_API SkTableMaskFilter : public SkMaskFilter { |
| public: |
| SkTableMaskFilter(); |
| SkTableMaskFilter(const uint8_t table[256]); |
| virtual ~SkTableMaskFilter(); |
| |
| /** Utility that sets the gamma table |
| */ |
| static void MakeGammaTable(uint8_t table[256], SkScalar gamma); |
| |
| /** Utility that creates a clipping table: clamps values below min to 0 |
| and above max to 255, and rescales the remaining into 0..255 |
| */ |
| static void MakeClipTable(uint8_t table[256], uint8_t min, uint8_t max); |
| |
| static SkTableMaskFilter* CreateGamma(SkScalar gamma) { |
| uint8_t table[256]; |
| MakeGammaTable(table, gamma); |
| return SkNEW_ARGS(SkTableMaskFilter, (table)); |
| } |
| |
| static SkTableMaskFilter* CreateClip(uint8_t min, uint8_t max) { |
| uint8_t table[256]; |
| MakeClipTable(table, min, max); |
| return SkNEW_ARGS(SkTableMaskFilter, (table)); |
| } |
| |
| virtual SkMask::Format getFormat() const SK_OVERRIDE; |
| virtual bool filterMask(SkMask*, const SkMask&, const SkMatrix&, |
| SkIPoint*) const SK_OVERRIDE; |
| |
| SkDEVCODE(virtual void toString(SkString* str) const SK_OVERRIDE;) |
| SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkTableMaskFilter) |
| |
| protected: |
| SkTableMaskFilter(SkFlattenableReadBuffer& rb); |
| virtual void flatten(SkFlattenableWriteBuffer&) const SK_OVERRIDE; |
| |
| private: |
| uint8_t fTable[256]; |
| |
| typedef SkMaskFilter INHERITED; |
| }; |
| |
| #endif |