SkCoverageMode.h File Reference

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Enumerations
enum class	SkCoverageMode {   kUnion , kIntersect , kDifference , kReverseDifference ,   kXor , kLast = kXor }

Enumeration Type Documentation

SkCoverageMode

enum class SkCoverageMode

strong

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.

Enumerator
kUnion
kIntersect
kDifference
kReverseDifference
kXor
kLast

Definition at line 18 of file SkCoverageMode.h.

                          {
    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,
};