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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 SkCoverageModePriv_DEFINED
- #define SkCoverageModePriv_DEFINED
- #include "include/core/SkBlendMode.h"
- #include "include/core/SkCoverageMode.h"
- SkBlendMode SkUncorrelatedCoverageModeToBlendMode(SkCoverageMode);
- #if 0
- // Experimental idea to extend to overlap types
- Master calculation = X(S,D) + Y(S,D) + Z(S,D)
- enum class SkCoverageOverlap {
- // X Y Z
- kUncorrelated, // S*D S*(1-D) D*(1-S)
- kConjoint, // min(S,D) max(S-D,0) max(D-S,0)
- kDisjoint, // max(S+D-1,0) min(S,1-D) min(D,1-S)
- kLast = kDisjoint
- };
- // The coverage modes each have a set of coefficients to be applied to the general equation (above)
- //
- // e.g.
- // kXor+conjoint = max(S-D,0) + max(D-S,0) ==> abs(D-S)
- //
- kUnion, // 1,1,1
- kIntersect, // 1,0,0
- kDifference, // 0,1,0
- kReverseDifference, // 0,0,1
- kXor, // 0,1,1
- #endif
- #endif
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