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/*
* Copyright (C) 2006 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#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 SkTableMaskFilter : public SkMaskFilter {
public:
SkTableMaskFilter();
SkTableMaskFilter(const uint8_t table[256]);
virtual ~SkTableMaskFilter();
void setTable(const uint8_t table[256]);
/** 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));
}
// overrides from SkMaskFilter
virtual SkMask::Format getFormat();
virtual bool filterMask(SkMask*, const SkMask&, const SkMatrix&, SkIPoint*);
// overrides from SkFlattenable
virtual void flatten(SkFlattenableWriteBuffer& wb);
virtual Factory getFactory();
protected:
SkTableMaskFilter(SkFlattenableReadBuffer& rb);
static SkFlattenable* Factory(SkFlattenableReadBuffer&);
private:
uint8_t fTable[256];
typedef SkMaskFilter INHERITED;
};
#endif
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