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third_party
skia
include
core
SkCoverageMode.h
Go to the documentation of this file.
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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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/**
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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
SkCoverageMode
SkCoverageMode
Definition
SkCoverageMode.h:18
SkCoverageMode::kReverseDifference
@ kReverseDifference
SkCoverageMode::kUnion
@ kUnion
SkCoverageMode::kLast
@ kLast
SkCoverageMode::kXor
@ kXor
SkCoverageMode::kIntersect
@ kIntersect
SkCoverageMode::kDifference
@ kDifference
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