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