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