// Copyright status: this file is in the public domain.

#include "lx.h"
#include "internal.h"

int lx_icccm_geometry(LX_SIZE_HINTS *sh, const LX_GEOMETRY *g)
{
 unsigned int set;
 unsigned int clr;

 if (sh->lx__version != ICCCM_INTF_VERSION_1) return(LX_GEOM_ERR_INVALID);
 set = 0;
 clr = 0;
 switch (g->flags & (LX_GEOM_PX|LX_GEOM_NX))
  { case LX_GEOM_PX:
    case LX_GEOM_NX:
       set |= LX_S_HINT_UPOS;
       clr |= LX_S_HINT_PPOS;
       break;
    case 0:
       set |= LX_S_HINT_PPOS;
       clr |= LX_S_HINT_UPOS;
       break;
    default:
       return(LX_GEOM_ERR_INVALID);
       break;
  }
 switch (g->flags & (LX_GEOM_PY|LX_GEOM_NY))
  { case LX_GEOM_PY:
    case LX_GEOM_NY:
       set |= LX_S_HINT_UPOS;
       clr |= LX_S_HINT_PPOS;
       break;
    case 0:
       set |= LX_S_HINT_PPOS;
       clr |= LX_S_HINT_UPOS;
       break;
    default:
       return(LX_GEOM_ERR_INVALID);
       break;
  }
 // In case of conflict, go with UPOS.
 if ((set & (LX_S_HINT_PPOS|LX_S_HINT_UPOS)) == (LX_S_HINT_PPOS|LX_S_HINT_UPOS))
  { set = LX_S_HINT_UPOS;
    clr = LX_S_HINT_PPOS;
  }
 sh->flags = (sh->flags & ~clr) | set;
 if (g->flags & (LX_GEOM_W|LX_GEOM_H))
  { sh->flags |= LX_S_HINT_USIZE;
  }
 else
  { sh->flags |= LX_S_HINT_PSIZE;
  }
 return(0);
}