diff options
-rw-r--r-- | src/core/SkXfermode.cpp | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/src/core/SkXfermode.cpp b/src/core/SkXfermode.cpp index 92743c2fdd..d78dcd8d49 100644 --- a/src/core/SkXfermode.cpp +++ b/src/core/SkXfermode.cpp @@ -1201,6 +1201,13 @@ static Sk4f clamp_0_255(const Sk4f& value) { return Sk4f::Max(Sk4f(0), Sk4f::Min(Sk4f(255), value)); } +// return a swizzle of a | rgb +static Sk4f set_a_rgb(const Sk4f& a, const Sk4f& rgb) { + SkPMFloat pma = a; + SkPMFloat pmc = rgb; + return SkPMFloat(pma.a(), pmc.r(), pmc.g(), pmc.b()); +} + /** * Some modes can, due to very slight numerical error, generate "invalid" pmcolors... * @@ -1311,6 +1318,34 @@ struct Multiply4f { static const SkXfermode::Mode kMode = SkXfermode::kMultiply_Mode; }; +struct Difference4f { + static SkPMFloat Xfer(const SkPMFloat& src, const SkPMFloat& dst) { + const Sk4f inv255(gInv255); + Sk4f sa = Sk4f(src.a()); + Sk4f da = Sk4f(dst.a()); + Sk4f sc = src; + Sk4f dc = dst; + Sk4f min = Sk4f::Min(sc * da, dc * sa) * inv255; + Sk4f ra = sc + dc - min; + return check_as_pmfloat(set_a_rgb(ra, ra - min)); + } + static const bool kFoldCoverageIntoSrcAlpha = false; + static const SkXfermode::Mode kMode = SkXfermode::kDifference_Mode; +}; + +struct Exclusion4f { + static SkPMFloat Xfer(const SkPMFloat& src, const SkPMFloat& dst) { + const Sk4f inv255(gInv255); + Sk4f sc = src; + Sk4f dc = dst; + Sk4f prod = sc * dc * inv255; + Sk4f ra = sc + dc - prod; + return check_as_pmfloat(set_a_rgb(ra, ra - prod)); + } + static const bool kFoldCoverageIntoSrcAlpha = false; + static const SkXfermode::Mode kMode = SkXfermode::kExclusion_Mode; +}; + template <typename ProcType> class SkT4fXfermode : public SkProcCoeffXfermode { public: @@ -1445,6 +1480,12 @@ SkXfermode* create_mode(int iMode) { case SkXfermode::kMultiply_Mode: xfer = SkT4fXfermode<Multiply4f>::Create(rec); break; + case SkXfermode::kDifference_Mode: + xfer = SkT4fXfermode<Difference4f>::Create(rec); + break; + case SkXfermode::kExclusion_Mode: + xfer = SkT4fXfermode<Exclusion4f>::Create(rec); + break; default: break; } |