1 | /* |
2 | * Copyright 2018 Google Inc. |
3 | * |
4 | * Use of this source code is governed by a BSD-style license that can be |
5 | * found in the LICENSE file. |
6 | */ |
7 | |
8 | #ifndef SkCoverageMode_DEFINED |
9 | #define SkCoverageMode_DEFINED |
10 | |
11 | #include "include/core/SkTypes.h" |
12 | |
13 | /** |
14 | * Describes geometric operations (ala SkRegion::Op) that can be applied to coverage bytes. |
15 | * These can be thought of as variants of porter-duff (SkBlendMode) modes, but only applied |
16 | * to the alpha channel. |
17 | * |
18 | * See SkMaskFilter for ways to use these when combining two different masks. |
19 | */ |
20 | enum class SkCoverageMode { |
21 | kUnion, // A ∪ B A+B-A*B |
22 | kIntersect, // A ∩ B A*B |
23 | kDifference, // A - B A*(1-B) |
24 | kReverseDifference, // B - A B*(1-A) |
25 | kXor, // A ⊕ B A+B-2*A*B |
26 | |
27 | kLast = kXor, |
28 | }; |
29 | |
30 | #endif |
31 | |