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/*
* Copyright 2017 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkMaskBlurFilter_DEFINED
#define SkMaskBlurFilter_DEFINED
#include <algorithm>
#include <memory>
#include <tuple>
#include "SkMask.h"
#include "SkTypes.h"
// Implement a single channel Gaussian blur. The specifics for implementation are taken from:
// https://drafts.fxtf.org/filters/#feGaussianBlurElement
class SkMaskBlurFilter {
public:
// Create an object suitable for filtering an SkMask using a filter with width sigmaW and
// height sigmaH.
SkMaskBlurFilter(double sigmaW, double sigmaH);
// returns true iff the sigmas will result in an identity mask (no blurring)
bool hasNoBlur() const;
// Given a src SkMask, generate dst SkMask returning the border width and height.
SkIPoint blur(const SkMask& src, SkMask* dst) const;
private:
const double fSigmaW;
const double fSigmaH;
};
#endif // SkBlurMaskFilter_DEFINED
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