/**
* @brief Equals operator for two TileIdentifiers.
*
* @return True if TileIdentifiers have equal values.
**/
bool operator==(const TileIdentifier &a, const TileIdentifier &b)
{
return a.getX() == b.getX() &&
a.getY() == b.getY() &&
a.getZoom() == b.getZoom() &&
a.getImageFormat() == b.getImageFormat() &&
a.getStylesheetPath() == b.getStylesheetPath(); // ?
}
/**
* @brief Returns a hash for the TileIdentifier.
*
* @return Hash usable for boost::unordered_map.
**/
std::size_t hash_value(const TileIdentifier &ti)
{
std::size_t seed = 0;
boost::hash_combine(seed, ti.getX());
boost::hash_combine(seed, ti.getY());
boost::hash_combine(seed, ti.getZoom());
boost::hash_combine(seed, ti.getImageFormat());
boost::hash_combine(seed, ti.getStylesheetPath()); // ?
return seed;
}
MetaIdentifier::MetaIdentifier(const TileIdentifier& origin)
: TileIdentifier(origin)
{
// round to neared multiple of META_TILE_SIZE
int x0 = origin.getX() / META_TILE_SIZE * META_TILE_SIZE;
int y0 = origin.getY() / META_TILE_SIZE * META_TILE_SIZE;
int x1 = x0 + META_TILE_SIZE;
int y1 = y0 + META_TILE_SIZE;
x1 = std::min(x1, (1 << origin.getZoom()));
y1 = std::min(y1, (1 << origin.getZoom()));
this->width = x1 - x0;
this->height = y1 - y0;
this->x = x0;
this->y = y0;
for (int tx = x; tx < x1; tx++)
for (int ty = y; ty < y1; ty++)
{
tids.push_back(
boost::make_shared<TileIdentifier>(tx, ty, origin.getZoom(),
origin.getStylesheetPath(),
origin.getImageFormat())
);
}
}
