Xfermode: SSE2 implementation of multiply_modeproc

src/opts/SkXfermode_opts_SSE2.h

+#ifndef SkXfermode_opts_SSE2_DEFINED
+#define SkXfermode_opts_SSE2_DEFINED
+
+#include "SkXfermode_proccoeff.h"
+
+class SkSSE2ProcCoeffXfermode : public SkProcCoeffXfermode {
+public:
+    SkSSE2ProcCoeffXfermode(const ProcCoeff& rec, SkXfermode::Mode mode,
+                            void* procSIMD)
+        : INHERITED(rec, mode), fProcSIMD(procSIMD) {}
+
+    virtual void xfer32(SkPMColor dst[], const SkPMColor src[], int count,
+                        const SkAlpha aa[]) const SK_OVERRIDE;
+    virtual void xfer16(uint16_t dst[], const SkPMColor src[],
+                        int count, const SkAlpha aa[]) const SK_OVERRIDE;
+
+    SK_TO_STRING_OVERRIDE()
+    SK_DECLARE_PUBLIC_FLATTENABLE_DESERIALIZATION_PROCS(SkSSE2ProcCoeffXfermode)
+
+private:
+    SkSSE2ProcCoeffXfermode(SkReadBuffer& buffer);
+
+    void* fProcSIMD;
+    typedef SkProcCoeffXfermode INHERITED;
+};
+
+SkProcCoeffXfermode* SkPlatformXfermodeFactory_impl_SSE2(const ProcCoeff& rec,
+                                                         SkXfermode::Mode mode);
+
+#endif // SkXfermode_opts_SSE2_DEFINED