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| 1 /* |
| 2 * Copyright 2006 The Android Open Source Project |
| 3 * |
| 4 * Use of this source code is governed by a BSD-style license that can be |
| 5 * found in the LICENSE file. |
| 6 */ |
| 7 |
| 8 #ifndef SkTableMaskFilter_DEFINED |
| 9 #define SkTableMaskFilter_DEFINED |
| 10 |
| 11 #include "SkMaskFilter.h" |
| 12 #include "SkScalar.h" |
| 13 |
| 14 /** \class SkTableMaskFilter |
| 15 |
| 16 Applies a table lookup on each of the alpha values in the mask. |
| 17 Helper methods create some common tables (e.g. gamma, clipping) |
| 18 */ |
| 19 class SK_API SkTableMaskFilter : public SkMaskFilter { |
| 20 public: |
| 21 /** Utility that sets the gamma table |
| 22 */ |
| 23 static void MakeGammaTable(uint8_t table[256], SkScalar gamma); |
| 24 |
| 25 /** Utility that creates a clipping table: clamps values below min to 0 |
| 26 and above max to 255, and rescales the remaining into 0..255 |
| 27 */ |
| 28 static void MakeClipTable(uint8_t table[256], uint8_t min, uint8_t max); |
| 29 |
| 30 static SkMaskFilter* Create(const uint8_t table[256]) { |
| 31 return new SkTableMaskFilter(table); |
| 32 } |
| 33 |
| 34 static SkMaskFilter* CreateGamma(SkScalar gamma) { |
| 35 uint8_t table[256]; |
| 36 MakeGammaTable(table, gamma); |
| 37 return new SkTableMaskFilter(table); |
| 38 } |
| 39 |
| 40 static SkMaskFilter* CreateClip(uint8_t min, uint8_t max) { |
| 41 uint8_t table[256]; |
| 42 MakeClipTable(table, min, max); |
| 43 return new SkTableMaskFilter(table); |
| 44 } |
| 45 |
| 46 SkMask::Format getFormat() const override; |
| 47 bool filterMask(SkMask*, const SkMask&, const SkMatrix&, SkIPoint*) const ov
erride; |
| 48 |
| 49 SK_TO_STRING_OVERRIDE() |
| 50 SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkTableMaskFilter) |
| 51 |
| 52 protected: |
| 53 virtual ~SkTableMaskFilter(); |
| 54 |
| 55 void flatten(SkWriteBuffer&) const override; |
| 56 |
| 57 private: |
| 58 SkTableMaskFilter(); |
| 59 explicit SkTableMaskFilter(const uint8_t table[256]); |
| 60 |
| 61 uint8_t fTable[256]; |
| 62 |
| 63 typedef SkMaskFilter INHERITED; |
| 64 }; |
| 65 |
| 66 #endif |
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