/*
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* Copyright 2006 The Android Open Source Project
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#ifndef SkTableMaskFilter_DEFINED
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#define SkTableMaskFilter_DEFINED
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#include "SkMaskFilter.h"
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#include "SkScalar.h"
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/** \class SkTableMaskFilter
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Applies a table lookup on each of the alpha values in the mask.
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Helper methods create some common tables (e.g. gamma, clipping)
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*/
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class SK_API SkTableMaskFilter {
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public:
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/** Utility that sets the gamma table
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*/
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static void MakeGammaTable(uint8_t table[256], SkScalar gamma);
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/** Utility that creates a clipping table: clamps values below min to 0
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and above max to 255, and rescales the remaining into 0..255
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*/
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static void MakeClipTable(uint8_t table[256], uint8_t min, uint8_t max);
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static SkMaskFilter* Create(const uint8_t table[256]);
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static SkMaskFilter* CreateGamma(SkScalar gamma);
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static SkMaskFilter* CreateClip(uint8_t min, uint8_t max);
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SkTableMaskFilter() = delete;
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};
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#endif
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