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/*
* Copyright 2018 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkCoverageMode_DEFINED
#define SkCoverageMode_DEFINED
/**
* Describes geometric operations (ala SkRegion::Op) that can be applied to coverage bytes.
* These can be thought of as variants of porter-duff (SkBlendMode) modes, but only applied
* to the alpha channel.
*
* See SkMaskFilter for ways to use these when combining two different masks.
*/
enum class SkCoverageMode {
kUnion, // A ∪ B A+B-A*B
kIntersect, // A ∩ B A*B
kDifference, // A - B A*(1-B)
kReverseDifference, // B - A B*(1-A)
kXor, // A ⊕ B A+B-2*A*B
kLast = kXor,
};
#endif
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