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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
- #include "include/core/SkTypes.h"
- /**
- * 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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