jfjoch_viewer: Access binary plot whenever possible

reader/JFJochHttpReader.cpp

@@ -189,6 +189,17 @@ std::vector<float> JFJochHttpReader::GetPlot_i(const std::string &plot_type, flo
         return {};
 
     httplib::Client cli_cmd(addr);
+
+    auto res_bin = cli_cmd.Get("/preview/plot.bin?type=" + plot_type);
+    if (res_bin && res_bin->status == httplib::StatusCode::OK_200) {
+        if (res_bin->body.size() % sizeof(float) != 0) {
+            throw std::runtime_error("Input size is not a multiple of sizeof(float)");
+        }
+        std::vector<float> v(res_bin->body.size() / sizeof(float));
+        std::memcpy(v.data(), res_bin->body.data(), res_bin->body.size());
+        return v;
+    }
+
     auto res = cli_cmd.Get("/preview/plot?binning=1&experimental_coord=false&fill="
                            + std::to_string(fill_value) + "&type=" + plot_type);