88 lines
3.2 KiB
C++
88 lines
3.2 KiB
C++
#include <mbgl/style/tile_source.hpp>
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#include <mbgl/style/source_observer.hpp>
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#include <mbgl/style/parser.hpp>
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#include <mbgl/util/tileset.hpp>
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#include <mbgl/storage/file_source.hpp>
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namespace mbgl {
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namespace style {
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TileSource::TileSource(SourceType type_,
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std::string id_,
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std::string url_,
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uint16_t tileSize_,
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std::unique_ptr<Tileset>&& tileset_)
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: Source(type_, std::move(id_)),
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tileSize(tileSize_),
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url(std::move(url_)),
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tileset(std::move(tileset_)) {
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}
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TileSource::~TileSource() = default;
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Range<uint8_t> TileSource::getZoomRange() {
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return tileset->zoomRange;
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}
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void TileSource::load(FileSource& fileSource) {
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if (url.empty()) {
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// If the URL is empty, the TileJSON was specified inline in the stylesheet.
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loaded = true;
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return;
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}
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if (req) {
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return;
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}
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// URL may either be a TileJSON file, or a GeoJSON file.
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req = fileSource.request(Resource::source(url), [this](Response res) {
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if (res.error) {
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observer->onSourceError(*this, std::make_exception_ptr(std::runtime_error(res.error->message)));
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} else if (res.notModified) {
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return;
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} else if (res.noContent) {
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observer->onSourceError(*this, std::make_exception_ptr(std::runtime_error("unexpectedly empty TileJSON")));
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} else {
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std::unique_ptr<Tileset> newTileset;
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// Create a new copy of the Tileset object that holds the base values we've parsed
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// from the stylesheet. Then merge in the values parsed from the TileJSON we retrieved
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// via the URL.
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try {
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newTileset = style::parseTileJSON(*res.data, url, type, tileSize);
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} catch (...) {
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observer->onSourceError(*this, std::current_exception());
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return;
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}
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// Check whether previous information specifies different tile
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if (tileset && tileset->tiles != newTileset->tiles) {
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// Tile URLs changed: force tiles to be reloaded.
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invalidateTiles();
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// Tile size changed: We need to recalculate the tiles we need to load because we
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// might have to load tiles for a different zoom level
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// This is done automatically when we trigger the onSourceLoaded observer below.
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// Min/Max zoom changed: We need to recalculate what tiles to load, if we have tiles
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// loaded that are outside the new zoom range
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// This is done automatically when we trigger the onSourceLoaded observer below.
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// Attribution changed: We need to notify the embedding application that this
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// changed. See https://github.com/mapbox/mapbox-gl-native/issues/2723
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// This is not yet implemented.
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// Center/bounds changed: We're not using these values currently
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}
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tileset = std::move(newTileset);
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loaded = true;
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observer->onSourceLoaded(*this);
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}
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});
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}
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} // namespace style
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} // namespace mbgl
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