Filter SDK/Two-Five fast Invert

Please not that the code below may not actually be faster than the Two-Five Invert sample, because the compiler doesn't handle 64 bit intergers very well. However this is not the case when using MMX or Integer SSE.

#include "avisynth.h"

class Invert : public GenericVideoFilter {
    public:
        Invert(PClip _child) : GenericVideoFilter(_child) {}
        PVideoFrame __stdcall GetFrame(int n, IScriptEnvironment* env);
    };

PVideoFrame __stdcall Invert::GetFrame(int n, IScriptEnvironment* env) {

    PVideoFrame src = child->GetFrame(n, env);
    PVideoFrame dst = env->NewVideoFrame(vi);

    const __int64* srcpY = (__int64*)src->GetReadPtr(PLANAR_Y);
    const __int64* srcpV = (__int64*)src->GetReadPtr(PLANAR_V);
    const __int64* srcpU = (__int64*)src->GetReadPtr(PLANAR_U);

    __int64* dstpY = (__int64*)dst->GetWritePtr(PLANAR_Y);
    __int64* dstpV = (__int64*)dst->GetWritePtr(PLANAR_V);
    __int64* dstpU = (__int64*)dst->GetWritePtr(PLANAR_U);
    
    const int src_pitchY = src->GetPitch(PLANAR_Y)/8;     // 8 bytes per loop
    const int src_pitchUV = src->GetPitch(PLANAR_V)/8;
    const int dst_pitchY = dst->GetPitch(PLANAR_Y)/8;
    const int dst_pitchUV = dst->GetPitch(PLANAR_U)/8;
    
    const int row_sizeY = dst->GetRowSize(PLANAR_Y_ALIGNED)/8;       // Mod 16 size
    const int row_sizeUV = dst->GetRowSize(PLANAR_U_ALIGNED)/8;      // Mod 8 size
    
    const int heightY = dst->GetHeight(PLANAR_Y);
    const int heightUV = dst->GetHeight(PLANAR_U);
    
    __int64 inv = 0xffffffffffffffff;
    
    for (int y = 0; y < heightY; y++) {
        for (int x = 0; x < row_sizeY; x++)
            dstpY[x] = srcpY[x] ^ inv;
        srcpY += src_pitchY;
        dstpY += dst_pitchY;
    }
    
    for (int y = 0; y < heightUV; y++) {
        for (int x = 0; x < row_sizeUV; x++) {
            dstpU[x] = srcpU[x]  ^ inv;
            dstpV[x] = srcpV[x]  ^ inv;
        }
        srcpU += src_pitchUV;
        dstpU += dst_pitchUV;
        srcpV += src_pitchUV;
        dstpV += dst_pitchUV;
    }
    return dst;
}

AVSValue __cdecl Create_Invert(AVSValue args, void* user_data, IScriptEnvironment* env) {
    return new Invert(args[0].AsClip());```}}
}

extern "C" __declspec(dllexport) const char* __stdcall AvisynthPluginInit2(IScriptEnvironment* env) {
    env->AddFunction("Invert", "c", Create_Invert, 0);
    return "`Invert' sample plugin";
}

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