[core] *Tile ↔ *TileData

Tile is now the main base class; RasterTile, VectorTile, etc are its subclasses. GeometryTileData and its subclasses form the piece that's passed to the worker.

src/mbgl/tile/raster_tile.cpp

@@ -0,0 +1,68 @@
+#include <mbgl/tile/raster_tile.hpp>
+#include <mbgl/tile/tile_observer.hpp>
+#include <mbgl/tile/tile_source_impl.hpp>
+#include <mbgl/style/source.hpp>
+#include <mbgl/style/update_parameters.hpp>
+#include <mbgl/storage/resource.hpp>
+#include <mbgl/storage/response.hpp>
+#include <mbgl/storage/file_source.hpp>
+#include <mbgl/util/worker.hpp>
+#include <mbgl/util/work_request.hpp>
+
+using namespace mbgl;
+
+RasterTile::RasterTile(const OverscaledTileID& id_,
+                       const style::UpdateParameters& parameters,
+                       const Tileset& tileset)
+    : Tile(id_),
+      texturePool(parameters.texturePool),
+      worker(parameters.worker),
+      tileSource(*this, id_, parameters, tileset) {
+}
+
+void RasterTile::setError(std::exception_ptr err) {
+    observer->onTileError(*this, err);
+}
+
+void RasterTile::setData(std::shared_ptr<const std::string> data,
+                             optional<Timestamp> modified_,
+                             optional<Timestamp> expires_) {
+    modified = modified_;
+    expires = expires_;
+
+    if (!data) {
+        // This is a 404 response. We're treating these as empty tiles.
+        workRequest.reset();
+        availableData = DataAvailability::All;
+        bucket.reset();
+        observer->onTileLoaded(*this, true);
+        return;
+    }
+
+    workRequest.reset();
+    workRequest = worker.parseRasterTile(std::make_unique<RasterBucket>(texturePool), data, [this] (RasterTileParseResult result) {
+        workRequest.reset();
+
+        availableData = DataAvailability::All;
+
+        if (result.is<std::unique_ptr<Bucket>>()) {
+            bucket = std::move(result.get<std::unique_ptr<Bucket>>());
+            observer->onTileLoaded(*this, true);
+        } else {
+            bucket.reset();
+            observer->onTileError(*this, result.get<std::exception_ptr>());
+        }
+    });
+}
+
+Bucket* RasterTile::getBucket(const style::Layer&) {
+    return bucket.get();
+}
+
+void RasterTile::setNecessity(Necessity necessity) {
+    tileSource.setNecessity(static_cast<TileSource<RasterTile>::Necessity>(necessity));
+}
+
+void RasterTile::cancel() {
+    workRequest.reset();
+}