| /* |
| * 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 |
