SSD132X_SEGMENT_WIDTH
rect->x1 = round_down(rect->x1, SSD132X_SEGMENT_WIDTH);
rect->x2 = min_t(unsigned int, round_up(rect->x2, SSD132X_SEGMENT_WIDTH),
unsigned int columns = DIV_ROUND_UP(ssd130x->width, SSD132X_SEGMENT_WIDTH);
ssd130x->width / SSD132X_SEGMENT_WIDTH - 1);
unsigned int segment_width = SSD132X_SEGMENT_WIDTH;
unsigned int columns = DIV_ROUND_UP(ssd130x->width, SSD132X_SEGMENT_WIDTH);