| /* |
| * 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 "include/core/SkScalar.h" |
| #include "include/core/SkTypes.h" |
| |
| #include <cstdint> |
| |
| class SkMaskFilter; |
| |
| /** \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: |
| /** 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 SkMaskFilter* Create(const uint8_t table[256]); |
| static SkMaskFilter* CreateGamma(SkScalar gamma); |
| static SkMaskFilter* CreateClip(uint8_t min, uint8_t max); |
| |
| SkTableMaskFilter() = delete; |
| }; |
| |
| #endif |