132     int64_t d; /*slope value at specified t*/  in lv_cubic_bezier()  local
134     int32_t d;  in lv_cubic_bezier()  local
164         /* get slop at t, d = 3 * ax * t^2 + 2 * bx + t + cx */  in lv_cubic_bezier()
165         d = ax; /* use 64bit operation if needed. */  in lv_cubic_bezier()
166         d = (3 * d * t) >> CUBIC_PRECISION_BITS;  in lv_cubic_bezier()
167         d = ((d + 2 * bx) * t) >> CUBIC_PRECISION_BITS;  in lv_cubic_bezier()
168         d += cx;  in lv_cubic_bezier()
170         if(LV_ABS(d) <= 1) break;  in lv_cubic_bezier()
172         d = ((int64_t)xs * (1L << CUBIC_PRECISION_BITS)) / d;  in lv_cubic_bezier()
173         if(d == 0) break;  /*Reached precision limits*/  in lv_cubic_bezier()
174         t -= d;  in lv_cubic_bezier()