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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 "include/private/SkNx.h"
- #include "src/core/Sk4px.h"
- #include "src/core/SkMSAN.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 <> 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 unitialized 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 <> void mark_dst_initialized_if_safe<Src>(void* dst, void* end) {
- sk_msan_mark_initialized(dst, end, "Src doesn't read dst.");
- }
- template <> 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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