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- /*
- * 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/SkMaskFilter.h"
- #include "include/core/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:
- /** 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
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