Function getRegionAt

bwapi/BWAPI/Source/BW/Pathing.cpp:60–93

  }

  const BW::region *getRegionAt(int x, int y)
  {
    BWAPI::TilePosition tp(x/32, y/32);
    if ( tp.x < 0 || tp.y < 0 || tp.x >= 256 || tp.y >= 256 )
      return nullptr;

    // Obtain the region IDs from the positions
    u16 id = BW::BWDATA::SAIPathing->mapTileRegionId[tp.y][tp.x];

    // Check if the id is splitting the tile between regions
    if ( id & 0xE000 )
    {
      // Correct the ID (convert higher bits)
      id = (id & 0x1FFF) + ((id & 0xC000) >> 1);

      // Get source region from split-tile based on walk tile
      int minitilePosX = (x&0x1F)/8;
      int minitilePosY = (y&0x1F)/8;
      int minitileShift = minitilePosX + minitilePosY * 4;
      BW::split *t = &BW::BWDATA::SAIPathing->splitTiles[id];
      if ( (t->minitileMask >> minitileShift) & 1 )
        return &BW::BWDATA::SAIPathing->regions[t->rgn2];
      return &BW::BWDATA::SAIPathing->regions[t->rgn1];
    }
    else if ( id < 5000 )
    {
      // Get source region from tile
      return &BW::BWDATA::SAIPathing->regions[id];
    }
    else
    {
      return nullptr;
    }
  }
  const BW::region *getRegionAt(Position pos)
  {
    return getRegionAt(pos.x, pos.y);