/**
* Find a loaded parent of the given tile.
*
* @param id The tile ID that we should find children for.
* @param minCoveringZoom The minimum zoom level of parents to look for.
* @param retain An object that we add the found tiles to.
*
* @return boolean Whether a parent was found.
*/
bool Source::findLoadedParent(const Tile::ID& id, int32_t minCoveringZoom, std::forward_list<Tile::ID>& retain) {
for (int32_t z = id.z - 1; z >= minCoveringZoom; --z) {
const Tile::ID parent_id = id.parent(z);
const TileData::State state = hasTile(parent_id);
if (state == TileData::State::parsed) {
retain.emplace_front(parent_id);
return true;
}
}
return false;
}
std::forward_list<mbgl::Tile::ID> Source::covering_tiles(const TransformState &state, int32_t clamped_zoom, const box& points) {
int32_t dim = std::pow(2, clamped_zoom);
std::forward_list<mbgl::Tile::ID> tiles;
bool is_raster = (info.type == SourceType::Raster);
double search_zoom = getZoom(state);
auto scanLine = [&tiles, clamped_zoom, is_raster, search_zoom](int32_t x0, int32_t x1, int32_t y, int32_t ymax) {
int32_t x;
if (y >= 0 && y <= ymax) {
for (x = x0; x < x1; x++) {
if (is_raster) {
Tile::ID id = Tile::ID(clamped_zoom, x, y);
auto ids = id.children(search_zoom);
for (const Tile::ID& child_id : ids) {
tiles.emplace_front(child_id.z, child_id.x, child_id.y);
}
} else {
tiles.emplace_front(clamped_zoom, x, y);
}
}
}
};
// Divide the screen up in two triangles and scan each of them:
// \---+
// | \ |
// +---\.
_scanTriangle(points.tl, points.tr, points.br, 0, dim, scanLine);
_scanTriangle(points.br, points.bl, points.tl, 0, dim, scanLine);
const vec2<double>& center = points.center;
tiles.sort([¢er](const Tile::ID& a, const Tile::ID& b) {
// Sorts by distance from the box center
return std::fabs(a.x - center.x) + std::fabs(a.y - center.y) <
std::fabs(b.x - center.x) + std::fabs(b.y - center.y);
});
tiles.unique();
return tiles;
}
TileData::State Source::addTile(Map& map, uv::worker& worker,
util::ptr<Style> style,
GlyphAtlas& glyphAtlas, GlyphStore& glyphStore,
SpriteAtlas& spriteAtlas, util::ptr<Sprite> sprite,
FileSource& fileSource, Texturepool& texturepool,
const Tile::ID& id,
std::function<void ()> callback) {
const TileData::State state = hasTile(id);
if (state != TileData::State::invalid) {
return state;
}
auto pos = tiles.emplace(id, std::make_unique<Tile>(id));
Tile& new_tile = *pos.first->second;
// We couldn't find the tile in the list. Create a new one.
// Try to find the associated TileData object.
const Tile::ID normalized_id = id.normalized();
auto it = tile_data.find(normalized_id);
if (it != tile_data.end()) {
// Create a shared_ptr handle. Note that this might be empty!
new_tile.data = it->second.lock();
}
if (new_tile.data && new_tile.data->state == TileData::State::obsolete) {
// Do not consider the tile if it's already obsolete.
new_tile.data.reset();
}
if (!new_tile.data) {
// If we don't find working tile data, we're just going to load it.
if (info.type == SourceType::Vector) {
new_tile.data = std::make_shared<VectorTileData>(normalized_id, map.getMaxZoom(), style,
glyphAtlas, glyphStore,
spriteAtlas, sprite,
texturepool, info);
} else if (info.type == SourceType::Raster) {
new_tile.data = std::make_shared<RasterTileData>(normalized_id, texturepool, info);
} else {
throw std::runtime_error("source type not implemented");
}
new_tile.data->request(worker, fileSource, map.getState().getPixelRatio(), callback);
tile_data.emplace(new_tile.data->id, new_tile.data);
}
return new_tile.data->state;
}
/**
* Recursively find children of the given tile that are already loaded.
*
* @param id The tile ID that we should find children for.
* @param maxCoveringZoom The maximum zoom level of children to look for.
* @param retain An object that we add the found tiles to.
*
* @return boolean Whether the children found completely cover the tile.
*/
bool Source::findLoadedChildren(const Tile::ID& id, int32_t maxCoveringZoom, std::forward_list<Tile::ID>& retain) {
bool complete = true;
int32_t z = id.z;
auto ids = id.children(z + 1);
for (const Tile::ID& child_id : ids) {
const TileData::State state = hasTile(child_id);
if (state == TileData::State::parsed) {
retain.emplace_front(child_id);
} else {
complete = false;
if (z < maxCoveringZoom) {
// Go further down the hierarchy to find more unloaded children.
findLoadedChildren(child_id, maxCoveringZoom, retain);
}
}
}
return complete;
}
TileData::State Source::addTile(Map &map, const Tile::ID& id) {
const TileData::State state = hasTile(id);
if (state != TileData::State::invalid) {
return state;
}
auto pos = tiles.emplace(id, std::make_unique<Tile>(id));
Tile& new_tile = *pos.first->second;
// We couldn't find the tile in the list. Create a new one.
// Try to find the associated TileData object.
const Tile::ID normalized_id = id.normalized();
auto it = tile_data.find(normalized_id);
if (it != tile_data.end()) {
// Create a shared_ptr handle. Note that this might be empty!
new_tile.data = it->second.lock();
}
if (new_tile.data && new_tile.data->state == TileData::State::obsolete) {
// Do not consider the tile if it's already obsolete.
new_tile.data.reset();
}
if (!new_tile.data) {
// If we don't find working tile data, we're just going to load it.
if (info.type == SourceType::Vector) {
new_tile.data = std::make_shared<VectorTileData>(normalized_id, map, info);
} else if (info.type == SourceType::Raster) {
new_tile.data = std::make_shared<RasterTileData>(normalized_id, map, info);
} else if (info.type == SourceType::GeoJSON) {
new_tile.data = std::make_shared<GeoJSONTileData>(normalized_id, map, info);
} else {
throw std::runtime_error("source type not implemented");
}
new_tile.data->request();
tile_data.emplace(new_tile.data->id, new_tile.data);
}
return new_tile.data->state;
}