Function plotLineAA

plugins/rendermax/renderer_light.cpp:210–258

    return ;
}
void plotLineAA(int x0, int y0, int x1, int y1,rgbf power,const std::function<rgbf(rgbf,int,int,int,int)>& setPixelAA)
{
    int dx = abs(x1-x0), sx = x0<x1 ? 1 : -1;
    int dy = abs(y1-y0), sy = y0<y1 ? 1 : -1;
    int err = dx-dy, e2, x2;                       /* error value e_xy */
    int ed = dx+dy == 0 ? 1 : sqrt((float)dx*dx+(float)dy*dy);
    int rdx=0;
    int rdy=0;
    int lrdx,lrdy;
    rgbf sumPower;
    for ( ; ; ){                                         /* pixel loop */
        float strsum=0;
        float str=1-abs(err-dx+dy)/(float)ed;
        strsum=str;
        sumPower=setPixelAA(power*str,rdx,rdy,x0,y0);
        e2 = err; x2 = x0;
        lrdx=rdx;
        lrdy=rdy;
        rdx=rdy=0;
        if (2*e2 >= -dx) {                                    /* x step */
            if (x0 == x1) break;

            if (e2+dy < ed)
                {
                    str=1-(e2+dy)/(float)ed;
                    sumPower+=setPixelAA(power*str,lrdx,lrdy,x0,y0+sy);
                    strsum+=str;
                }
            err -= dy; x0 += sx; rdx=sx;
        }
        if (2*e2 <= dy) {                                     /* y step */
            if (y0 == y1) break;

            if (dx-e2 < ed)
                {
                    str=1-(dx-e2)/(float)ed;
                    sumPower+=setPixelAA(power*str,lrdx,lrdy,x2+sx,y0);
                    strsum+=str;
                }
            err += dx; y0 += sy; rdy=sy;
        }
        if(strsum<0.001f)
            return;
        sumPower=sumPower/strsum;
        if(sumPower.dot(sumPower)<0.00001f)
            return;
        power=sumPower;
    }
}
rgbf blendMax(const rgbf& a,const rgbf& b)
{
    return rgbf(std::max(a.r,b.r),std::max(a.g,b.g),std::max(a.b,b.b));