870             int32_t first = rect.x2 - abs_x + 1;  in lv_draw_mask_radius()  local
871             if(first <= 0) return LV_DRAW_SW_MASK_RES_TRANSP;  in lv_draw_mask_radius()
872             else if(first < len) {  in lv_draw_mask_radius()
873                 lv_memzero(&mask_buf[first], len - first);  in lv_draw_mask_radius()
875             if(last == 0 && first == len) return LV_DRAW_SW_MASK_RES_FULL_COVER;  in lv_draw_mask_radius()
879             int32_t first = rect.x1 - abs_x;  in lv_draw_mask_radius()  local
880             if(first < 0) first = 0;  in lv_draw_mask_radius()
881             if(first <= len) {  in lv_draw_mask_radius()
882                 int32_t last = rect.x2 - abs_x - first + 1;  in lv_draw_mask_radius()
883                 if(first + last > len) last = len - first;  in lv_draw_mask_radius()
885                     lv_memzero(&mask_buf[first], last);  in lv_draw_mask_radius()