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/*
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* Copyright 2018 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 SkCoverageMode_DEFINED
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#define SkCoverageMode_DEFINED
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#include "SkTypes.h"
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/**
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* Describes geometric operations (ala SkRegion::Op) that can be applied to coverage bytes.
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* These can be thought of as variants of porter-duff (SkBlendMode) modes, but only applied
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* to the alpha channel.
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*
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* See SkMaskFilter for ways to use these when combining two different masks.
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*/
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enum class SkCoverageMode {
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kUnion, // A ∪ B A+B-A*B
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kIntersect, // A ∩ B A*B
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kDifference, // A - B A*(1-B)
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kReverseDifference, // B - A B*(1-A)
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kXor, // A ⊕ B A+B-2*A*B
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kLast = kXor,
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};
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#endif
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