summaryrefslogtreecommitdiff
path: root/src/mbgl/style/group_by_layout.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'src/mbgl/style/group_by_layout.cpp')
-rw-r--r--src/mbgl/style/group_by_layout.cpp51
1 files changed, 51 insertions, 0 deletions
diff --git a/src/mbgl/style/group_by_layout.cpp b/src/mbgl/style/group_by_layout.cpp
new file mode 100644
index 0000000000..52d33827ef
--- /dev/null
+++ b/src/mbgl/style/group_by_layout.cpp
@@ -0,0 +1,51 @@
+#include <mbgl/style/group_by_layout.hpp>
+#include <mbgl/style/layer.hpp>
+#include <mbgl/style/layer_impl.hpp>
+#include <mbgl/style/conversion/stringify.hpp>
+#include <mbgl/util/rapidjson.hpp>
+
+#include <rapidjson/writer.h>
+#include <rapidjson/stringbuffer.h>
+
+#include <unordered_map>
+
+namespace mbgl {
+namespace style {
+
+std::string layoutKey(const Layer& layer) {
+ using namespace conversion;
+
+ rapidjson::StringBuffer s;
+ rapidjson::Writer<rapidjson::StringBuffer> writer(s);
+
+ writer.StartArray();
+ writer.Uint(static_cast<uint32_t>(layer.type));
+ writer.String(layer.baseImpl->source);
+ writer.String(layer.baseImpl->sourceLayer);
+ writer.Double(layer.baseImpl->minZoom);
+ writer.Double(layer.baseImpl->maxZoom);
+ writer.Uint(static_cast<uint32_t>(layer.baseImpl->visibility));
+ stringify(writer, layer.baseImpl->filter);
+ layer.baseImpl->stringifyLayout(writer);
+ writer.EndArray();
+
+ return s.GetString();
+}
+
+std::vector<std::vector<std::unique_ptr<Layer>>> groupByLayout(std::vector<std::unique_ptr<Layer>> layers) {
+ std::unordered_map<std::string, std::vector<std::unique_ptr<Layer>>> map;
+ for (auto& layer : layers) {
+ auto& vector = map[layoutKey(*layer)];
+ vector.push_back(std::move(layer));
+ }
+
+ std::vector<std::vector<std::unique_ptr<Layer>>> result;
+ for (auto& pair : map) {
+ result.push_back(std::move(pair.second));
+ }
+
+ return result;
+}
+
+} // namespace style
+} // namespace mbgl