include/effects/SkKernel33MaskFilter.h

/*
 * Copyright (C) 2008 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 SkKernel33MaskFilter_DEFINED
#define SkKernel33MaskFilter_DEFINED

#include "SkMaskFilter.h"

class SkKernel33ProcMaskFilter : public SkMaskFilter {
public:
    SkKernel33ProcMaskFilter(unsigned percent256 = 256)
        : fPercent256(percent256) {}

    virtual uint8_t computeValue(uint8_t* const* srcRows) = 0;
    
    // overrides from SkMaskFilter
    virtual SkMask::Format getFormat();
    virtual bool filterMask(SkMask*, const SkMask&, const SkMatrix&, SkIPoint*);

    // overrides from SkFlattenable
    virtual void flatten(SkFlattenableWriteBuffer& wb);

protected:
    SkKernel33ProcMaskFilter(SkFlattenableReadBuffer& rb);

private:
    int fPercent256;
    
    typedef SkMaskFilter INHERITED;
};

///////////////////////////////////////////////////////////////////////////////

class SkKernel33MaskFilter : public SkKernel33ProcMaskFilter {
public:
    SkKernel33MaskFilter(const int coeff[3][3], int shift, int percent256 = 256)
        : SkKernel33ProcMaskFilter(percent256)
    {
        memcpy(fKernel, coeff, 9 * sizeof(int));
        fShift = shift;
    }
    
    // override from SkKernel33ProcMaskFilter
    virtual uint8_t computeValue(uint8_t* const* srcRows);
    
    // overrides from SkFlattenable
    virtual void flatten(SkFlattenableWriteBuffer& wb);
    virtual Factory getFactory();
    
private:
    int fKernel[3][3];
    int fShift;

    SkKernel33MaskFilter(SkFlattenableReadBuffer& rb);
    static SkFlattenable* Create(SkFlattenableReadBuffer& rb);
    
    typedef SkKernel33ProcMaskFilter INHERITED;
};

#endif