sxsize = (full_xsize < xsize ? full_xsize : xsize);
sysize = (full_ysize < ysize ? full_ysize : ysize);
sx = SX + (full_xsize < xsize ? (xsize - full_xsize) / 2 : 0);
sy = SY + (full_ysize < ysize ? (ysize - full_ysize) / 2 : 0);
sxsize = (full_xsize < xsize ? full_xsize : xsize);
sysize = (full_ysize < ysize ? full_ysize : ysize);
sx = SX + (full_xsize < xsize ? (xsize - full_xsize) / 2 : 0);
sy = SY + (full_ysize < ysize ? (ysize - full_ysize) / 2 : 0);