Merge metadata from transaction instead of replace
This was replacing metadata when set in transactions rather
than merging. To fix this, merge has been augmented to also
report if a change occurred and to erase empty entries (as
a mechanism to "unset" metadata)
Bug: 122925737
Test: Added more unittests
Change-Id: Ia854cbcc1ddd334f18ffacea667cbb98778ec210
diff --git a/libs/gui/LayerMetadata.cpp b/libs/gui/LayerMetadata.cpp
index 745433a..04d2871 100644
--- a/libs/gui/LayerMetadata.cpp
+++ b/libs/gui/LayerMetadata.cpp
@@ -31,10 +31,23 @@
LayerMetadata::LayerMetadata(LayerMetadata&& other) = default;
-void LayerMetadata::merge(const LayerMetadata& other) {
+bool LayerMetadata::merge(const LayerMetadata& other, bool eraseEmpty) {
+ bool changed = false;
for (const auto& entry : other.mMap) {
- mMap[entry.first] = entry.second;
+ auto it = mMap.find(entry.first);
+ if (it != mMap.cend() && it->second != entry.second) {
+ if (eraseEmpty && entry.second.empty()) {
+ mMap.erase(it);
+ } else {
+ it->second = entry.second;
+ }
+ changed = true;
+ } else if (it == mMap.cend() && !entry.second.empty()) {
+ mMap[entry.first] = entry.second;
+ changed = true;
+ }
}
+ return changed;
}
status_t LayerMetadata::writeToParcel(Parcel* parcel) const {
diff --git a/libs/gui/include/gui/LayerMetadata.h b/libs/gui/include/gui/LayerMetadata.h
index 3ae10e4..47f0ced 100644
--- a/libs/gui/include/gui/LayerMetadata.h
+++ b/libs/gui/include/gui/LayerMetadata.h
@@ -34,7 +34,9 @@
LayerMetadata& operator=(const LayerMetadata& other);
LayerMetadata& operator=(LayerMetadata&& other);
- void merge(const LayerMetadata& other);
+ // Merges other into this LayerMetadata. If eraseEmpty is true, any entries in
+ // in this whose keys are paired with empty values in other will be erased.
+ bool merge(const LayerMetadata& other, bool eraseEmpty = false);
status_t writeToParcel(Parcel* parcel) const override;
status_t readFromParcel(const Parcel* parcel) override;