FRAME_COL_TO_PIXEL_X 2730 src/frame.c      *pix_x = FRAME_COL_TO_PIXEL_X (f, x) + FRAME_COLUMN_WIDTH (f) / 2;
FRAME_COL_TO_PIXEL_X 2335 src/xdisp.c    			   FRAME_COL_TO_PIXEL_X (f, pix_x),