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Diffstat (limited to 'platform/default/src/mbgl/storage/offline.cpp')
| -rw-r--r-- | platform/default/src/mbgl/storage/offline.cpp | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/platform/default/src/mbgl/storage/offline.cpp b/platform/default/src/mbgl/storage/offline.cpp new file mode 100644 index 0000000000..e1ec0acb31 --- /dev/null +++ b/platform/default/src/mbgl/storage/offline.cpp @@ -0,0 +1,158 @@ +#include <mbgl/storage/offline.hpp> +#include <mbgl/util/tileset.hpp> +#include <mbgl/util/projection.hpp> + +#include <mapbox/geojson.hpp> +#include <mapbox/geojson/rapidjson.hpp> + +#include <rapidjson/document.h> +#include <rapidjson/stringbuffer.h> +#include <rapidjson/writer.h> + +#include <cmath> + +namespace mbgl { + +// OfflineTilePyramidRegionDefinition + +OfflineTilePyramidRegionDefinition::OfflineTilePyramidRegionDefinition( + std::string styleURL_, LatLngBounds bounds_, double minZoom_, double maxZoom_, float pixelRatio_) + : styleURL(std::move(styleURL_)), + bounds(std::move(bounds_)), + minZoom(minZoom_), + maxZoom(maxZoom_), + pixelRatio(pixelRatio_) { + if (minZoom < 0 || maxZoom < 0 || maxZoom < minZoom || pixelRatio < 0 || + !std::isfinite(minZoom) || std::isnan(maxZoom) || !std::isfinite(pixelRatio)) { + throw std::invalid_argument("Invalid offline region definition"); + } +} + + +// OfflineGeometryRegionDefinition + +OfflineGeometryRegionDefinition::OfflineGeometryRegionDefinition(std::string styleURL_, Geometry<double> geometry_, double minZoom_, double maxZoom_, float pixelRatio_) + : styleURL(styleURL_) + , geometry(std::move(geometry_)) + , minZoom(minZoom_) + , maxZoom(maxZoom_) + , pixelRatio(pixelRatio_) { + if (minZoom < 0 || maxZoom < 0 || maxZoom < minZoom || pixelRatio < 0 || + !std::isfinite(minZoom) || std::isnan(maxZoom) || !std::isfinite(pixelRatio)) { + throw std::invalid_argument("Invalid offline region definition"); + } +} + +OfflineRegionDefinition decodeOfflineRegionDefinition(const std::string& region) { + rapidjson::GenericDocument<rapidjson::UTF8<>, rapidjson::CrtAllocator> doc; + doc.Parse<0>(region.c_str()); + + // validation + + auto hasValidBounds = [&] { + return doc.HasMember("bounds") && doc["bounds"].IsArray() && doc["bounds"].Size() == 4 + && doc["bounds"][0].IsDouble() && doc["bounds"][1].IsDouble() + && doc["bounds"][2].IsDouble() && doc["bounds"][3].IsDouble(); + }; + + auto hasValidGeometry = [&] { + return doc.HasMember("geometry") && doc["geometry"].IsObject(); + }; + + if (doc.HasParseError() + || !doc.HasMember("style_url") || !doc["style_url"].IsString() + || !(hasValidBounds() || hasValidGeometry()) + || !doc.HasMember("min_zoom") || !doc["min_zoom"].IsDouble() + || (doc.HasMember("max_zoom") && !doc["max_zoom"].IsDouble()) + || !doc.HasMember("pixel_ratio") || !doc["pixel_ratio"].IsDouble()) { + throw std::runtime_error("Malformed offline region definition"); + } + + // Common properties + + std::string styleURL { doc["style_url"].GetString(), doc["style_url"].GetStringLength() }; + double minZoom = doc["min_zoom"].GetDouble(); + double maxZoom = doc.HasMember("max_zoom") ? doc["max_zoom"].GetDouble() : INFINITY; + float pixelRatio = doc["pixel_ratio"].GetDouble(); + + if (doc.HasMember("bounds")) { + return OfflineTilePyramidRegionDefinition{ + styleURL, + LatLngBounds::hull( + LatLng(doc["bounds"][0].GetDouble(), doc["bounds"][1].GetDouble()), + LatLng(doc["bounds"][2].GetDouble(), doc["bounds"][3].GetDouble())), + minZoom, maxZoom, pixelRatio }; + } else { + return OfflineGeometryRegionDefinition{ + styleURL, + mapbox::geojson::convert<Geometry<double>>(doc["geometry"].GetObject()), + minZoom, maxZoom, pixelRatio }; + }; + +} + +std::string encodeOfflineRegionDefinition(const OfflineRegionDefinition& region) { + rapidjson::GenericDocument<rapidjson::UTF8<>, rapidjson::CrtAllocator> doc; + doc.SetObject(); + + // Encode common properties + region.match([&](auto& _region) { + doc.AddMember("style_url", rapidjson::StringRef(_region.styleURL.data(), _region.styleURL.length()), doc.GetAllocator()); + doc.AddMember("min_zoom", _region.minZoom, doc.GetAllocator()); + if (std::isfinite(_region.maxZoom)) { + doc.AddMember("max_zoom", _region.maxZoom, doc.GetAllocator()); + } + + doc.AddMember("pixel_ratio", _region.pixelRatio, doc.GetAllocator()); + }); + + // Encode specific properties + region.match( + [&] (const OfflineTilePyramidRegionDefinition& _region) { + rapidjson::GenericValue<rapidjson::UTF8<>, rapidjson::CrtAllocator> bounds(rapidjson::kArrayType); + bounds.PushBack(_region.bounds.south(), doc.GetAllocator()); + bounds.PushBack(_region.bounds.west(), doc.GetAllocator()); + bounds.PushBack(_region.bounds.north(), doc.GetAllocator()); + bounds.PushBack(_region.bounds.east(), doc.GetAllocator()); + doc.AddMember("bounds", bounds, doc.GetAllocator()); + + }, + [&] (const OfflineGeometryRegionDefinition& _region) { + doc.AddMember("geometry", mapbox::geojson::convert(_region.geometry, doc.GetAllocator()), doc.GetAllocator()); + + } + ); + + rapidjson::StringBuffer buffer; + rapidjson::Writer<rapidjson::StringBuffer> writer(buffer); + doc.Accept(writer); + + return buffer.GetString(); +} + + +// OfflineRegion + +OfflineRegion::OfflineRegion(int64_t id_, + OfflineRegionDefinition definition_, + OfflineRegionMetadata metadata_) + : id(id_), + definition(std::move(definition_)), + metadata(std::move(metadata_)) { +} + +OfflineRegion::OfflineRegion(OfflineRegion&&) = default; +OfflineRegion::~OfflineRegion() = default; + +const OfflineRegionDefinition& OfflineRegion::getDefinition() const { + return definition; +} + +const OfflineRegionMetadata& OfflineRegion::getMetadata() const { + return metadata; +} + +int64_t OfflineRegion::getID() const { + return id; +} +} // namespace mbgl |