| /* |
| * 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 |