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#include <mbgl/renderer/group_by_layout.hpp>
#include <mbgl/renderer/render_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 {
std::string layoutKey(const RenderLayer& layer) {
using namespace style::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<const RenderLayer*>> groupByLayout(const std::vector<std::unique_ptr<RenderLayer>>& layers) {
std::unordered_map<std::string, std::vector<const RenderLayer*>> map;
for (auto& layer : layers) {
map[layoutKey(*layer)].push_back(layer.get());
}
std::vector<std::vector<const RenderLayer*>> result;
for (auto& pair : map) {
result.push_back(pair.second);
}
return result;
}
} // namespace mbgl
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