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{
        PIXEL_TYPE* aDestPixels = &aBits[aY0*STRIDE + aX0];
        ulong anErrAcc = (ulong)(fabs(theStartX - aX0)*fabs(theStartY - aY0) * 0x10000);
        if (dx >= dy) // mostly horizontal
        { 
                //ulong anErrAdj = (((ulong)dy << 16) / (ulong)dx);
                ulong anErrAdj = (ulong)(dyd / dxd * 0x10000);

                uchar aWeight = 255 - (uchar)(anErrAcc >> 8);
                uchar aWeight2 = (aWeight ^ 0xFF);

                int a = CALC_WEIGHT_A(aWeight);
                int oma = 256 - a;
                PIXEL_TYPE dest = *aDestPixels;
                BLEND_PIXEL(aDestPixels);
                while (--dx)
                {
                        anErrAcc += anErrAdj;
                        if (anErrAcc >= 0x10000)
                        {
                                anErrAcc &= 0xFFFF;
                                aDestPixels += STRIDE;
                                aY0++;
                        }
                        aDestPixels += aXinc;

                        uchar aWeight = 255 - (uchar)(anErrAcc >> 8);
                        uchar aWeight2 = (aWeight ^ 0xFF);

                        dest = *aDestPixels;
                        a = CALC_WEIGHT_A(aWeight);
                        oma = 256 - a;

                        BLEND_PIXEL(aDestPixels);
                        if (aY0 < mHeight-1)
                        {
                                dest = *(aDestPixels+STRIDE);
                                a = CALC_WEIGHT_A(aWeight2);
                                oma = 256 - a;
                                BLEND_PIXEL(aDestPixels+STRIDE);
                        }
                }
        }
        else // mostly vertical
        {
                //ulong anErrAdj = (ulong)(((ulong)dx << 16) / (ulong)dy);
                ulong anErrAdj = (ulong)(dxd / dyd * 0x10000);

                uchar aWeight = 255 - (uchar)(anErrAcc >> 8);
                uchar aWeight2 = (aWeight ^ 0xFF);

                int a = CALC_WEIGHT_A(aWeight);
                int oma = 256 - a;
                PIXEL_TYPE dest = *aDestPixels;
                BLEND_PIXEL(aDestPixels);
                while (--dy)
                {
                        anErrAcc += anErrAdj;
                        if (anErrAcc >= 0x10000)
                        {
                                anErrAcc &= 0xFFFF;
                                aDestPixels += aXinc;
                                aX0 += aXinc;
                        }
                        aDestPixels += STRIDE;

                        uchar aWeight = 255 - (uchar)(anErrAcc >> 8);
                        uchar aWeight2 = (aWeight ^ 0xFF);

                        dest = *aDestPixels;
                        int a = CALC_WEIGHT_A(aWeight);
                        int oma = 256 - a;

                        BLEND_PIXEL(aDestPixels);
                        if (aX0 < STRIDE-1)
                        {
                                a = CALC_WEIGHT_A(aWeight2);
                                oma = 256 - a;
                                dest = *(aDestPixels+aXinc);
                                BLEND_PIXEL(aDestPixels+aXinc);
                        }
                }
        }
        aDestPixels = &aBits[aY1*STRIDE + aX1];
        uchar aWeight = 255 - (uchar)(anErrAcc >> 8);
        uchar aWeight2 = (aWeight ^ 0xFF);

        int a = CALC_WEIGHT_A(aWeight);
        int oma = 256 - a;
        PIXEL_TYPE dest = *aDestPixels;
        BLEND_PIXEL(aDestPixels);
}