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/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef Sk4pxXfermode_DEFINED
#define Sk4pxXfermode_DEFINED
#include "src/base/SkMSAN.h"
#include "src/core/Sk4px.h"
#include "src/core/SkXfermodePriv.h"
#ifdef SK_FORCE_RASTER_PIPELINE_BLITTER
namespace SK_OPTS_NS {
/*not static*/ inline SkXfermode* create_xfermode(SkBlendMode) { return nullptr; }
}
#else
namespace { // NOLINT(google-build-namespaces)
// Most xfermodes can be done most efficiently 4 pixels at a time in 8 or 16-bit fixed point.
#define XFERMODE(Xfermode) \
struct Xfermode { Sk4px operator()(const Sk4px&, const Sk4px&) const; }; \
inline Sk4px Xfermode::operator()(const Sk4px& d, const Sk4px& s) const
XFERMODE(Clear) { return Sk4px::DupPMColor(0); }
XFERMODE(Src) { return s; }
XFERMODE(Dst) { return d; }
XFERMODE(SrcIn) { return s.approxMulDiv255(d.alphas() ); }
XFERMODE(SrcOut) { return s.approxMulDiv255(d.alphas().inv()); }
XFERMODE(SrcOver) { return s + d.approxMulDiv255(s.alphas().inv()); }
XFERMODE(DstIn) { return SrcIn ()(s,d); }
XFERMODE(DstOut) { return SrcOut ()(s,d); }
XFERMODE(DstOver) { return SrcOver()(s,d); }
// [ S * Da + (1 - Sa) * D]
XFERMODE(SrcATop) { return (s * d.alphas() + d * s.alphas().inv()).div255(); }
XFERMODE(DstATop) { return SrcATop()(s,d); }
//[ S * (1 - Da) + (1 - Sa) * D ]
XFERMODE(Xor) { return (s * d.alphas().inv() + d * s.alphas().inv()).div255(); }
// [S + D ]
XFERMODE(Plus) { return s.saturatedAdd(d); }
// [S * D ]
XFERMODE(Modulate) { return s.approxMulDiv255(d); }
// [S + D - S * D]
XFERMODE(Screen) {
// Doing the math as S + (1-S)*D or S + (D - S*D) means the add and subtract can be done
// in 8-bit space without overflow. S + (1-S)*D is a touch faster because inv() is cheap.
return s + d.approxMulDiv255(s.inv());
}
#undef XFERMODE
// A reasonable fallback mode for doing AA is to simply apply the transfermode first,
// then linearly interpolate the AA.
template <typename Xfermode>
static Sk4px xfer_aa(const Sk4px& d, const Sk4px& s, const Sk4px& aa) {
Sk4px bw = Xfermode()(d, s);
return (bw * aa + d * aa.inv()).div255();
}
// For some transfermodes we specialize AA, either for correctness or performance.
#define XFERMODE_AA(Xfermode) \
template <> inline Sk4px xfer_aa<Xfermode>(const Sk4px& d, const Sk4px& s, const Sk4px& aa)
// Plus' clamp needs to happen after AA. skia:3852
XFERMODE_AA(Plus) { // [ clamp( (1-AA)D + (AA)(S+D) ) == clamp(D + AA*S) ]
return d.saturatedAdd(s.approxMulDiv255(aa));
}
#undef XFERMODE_AA
// Src and Clear modes are safe to use with uninitialized dst buffers,
// even if the implementation branches based on bytes from dst (e.g. asserts in Debug mode).
// For those modes, just lie to MSAN that dst is always intialized.
template <typename Xfermode> static void mark_dst_initialized_if_safe(void*, void*) {}
template <> inline void mark_dst_initialized_if_safe<Src>(void* dst, void* end) {
sk_msan_mark_initialized(dst, end, "Src doesn't read dst.");
}
template <> inline void mark_dst_initialized_if_safe<Clear>(void* dst, void* end) {
sk_msan_mark_initialized(dst, end, "Clear doesn't read dst.");
}
template <typename Xfermode>
class Sk4pxXfermode : public SkXfermode {
public:
Sk4pxXfermode() {}
void xfer32(SkPMColor dst[], const SkPMColor src[], int n, const SkAlpha aa[]) const override {
mark_dst_initialized_if_safe<Xfermode>(dst, dst+n);
if (nullptr == aa) {
Sk4px::MapDstSrc(n, dst, src, Xfermode());
} else {
Sk4px::MapDstSrcAlpha(n, dst, src, aa, xfer_aa<Xfermode>);
}
}
};
} // namespace
namespace SK_OPTS_NS {
/*not static*/ inline SkXfermode* create_xfermode(SkBlendMode mode) {
switch (mode) {
#define CASE(Xfermode) \
case SkBlendMode::k##Xfermode: return new Sk4pxXfermode<Xfermode>()
CASE(Clear);
CASE(Src);
CASE(Dst);
CASE(SrcOver);
CASE(DstOver);
CASE(SrcIn);
CASE(DstIn);
CASE(SrcOut);
CASE(DstOut);
CASE(SrcATop);
CASE(DstATop);
CASE(Xor);
CASE(Plus);
CASE(Modulate);
CASE(Screen);
#undef CASE
default: break;
}
return nullptr;
}
} // namespace SK_OPTS_NS
#endif // #ifdef SK_FORCE_RASTER_PIPELINE_BLITTER
#endif//Sk4pxXfermode_DEFINED
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