Filter SDK/Two-Five Invert

The full source of the example plugin is presented below.

#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 unsigned char* srcpY = src->GetReadPtr(PLANAR_Y);
    const unsigned char* srcpV = src->GetReadPtr(PLANAR_V);    
    const unsigned char* srcpU = src->GetReadPtr(PLANAR_U);
                    
    unsigned char* dstpY = dst->GetWritePtr(PLANAR_Y);
    unsigned char* dstpV = dst->GetWritePtr(PLANAR_V);    
    unsigned char* dstpU = dst->GetWritePtr(PLANAR_U);
                       
    const int src_pitchY = src->GetPitch(PLANAR_Y);
    const int src_pitchUV = src->GetPitch(PLANAR_V);
    const int dst_pitchY = dst->GetPitch(PLANAR_Y);
    const int dst_pitchUV = dst->GetPitch(PLANAR_U);
                          
    const int row_sizeY = dst->GetRowSize(PLANAR_Y); 
    // Could also be PLANAR_Y_ALIGNED which would return a mod16 rowsize    
    const int row_sizeUV = dst->GetRowSize(PLANAR_U); 
    // Could also be PLANAR_U_ALIGNED which would return a mod8 rowsize    
                        
    const int heightY = dst->GetHeight(PLANAR_Y);
    const int heightUV = dst->GetHeight(PLANAR_U);
                           
    for (int y = 0; y < heightY; y++) {
        for (int x = 0; x < row_sizeY; x++)
            dstpY[x] = srcpY[x] ^ 255;
        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] ^ 255;
            dstpV[x] = srcpV[x] ^ 255;
        }
        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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