[core] make forcing cache/network only more explicit

Previously, we used the existence of a `prior*` field in the Resource object as an indication for whether we should consult the cache or not. However, this is prone to error, since a failed cache lookup won't set any prior fields. Therefore, we manually set `priorExpires` to 0. This in turn triggered another bug where generated wrong expiration timestamps when the server response we got was expired (or expired between sending and receiving).

This commit changes the flags so that we can now explicitly request CacheOnly/NetworkOnly (or All) loading methods, rather than the implicit Optional/Required naming scheme.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/mbgl/renderer/tile_pyramid.cpp b/src/mbgl/renderer/tile_pyramid.cpp
index 6cd9bd9ebd..3e2311089d 100644
--- a/src/mbgl/renderer/tile_pyramid.cpp
+++ b/src/mbgl/renderer/tile_pyramid.cpp
@@ -121,7 +121,7 @@ void TilePyramid::update(const std::vector<Immutable<style::Layer::Impl>>& layer
     // we're actively using, e.g. as a replacement for tile that aren't loaded yet.
     std::set<OverscaledTileID> retain;
 
-    auto retainTileFn = [&](Tile& tile, Resource::Necessity necessity) -> void {
+    auto retainTileFn = [&](Tile& tile, TileNecessity necessity) -> void {
         if (retain.emplace(tile.id).second) {
             tile.setNecessity(necessity);
         }
@@ -179,7 +179,7 @@ void TilePyramid::update(const std::vector<Immutable<style::Layer::Impl>>& layer
         while (tilesIt != tiles.end()) {
             if (retainIt == retain.end() || tilesIt->first < *retainIt) {
                 if (!needsRelayout) {
-                    tilesIt->second->setNecessity(Tile::Necessity::Optional);
+                    tilesIt->second->setNecessity(TileNecessity::Optional);
                     cache.add(tilesIt->first, std::move(tilesIt->second));
                 }
                 tiles.erase(tilesIt++);