CuraEngine.patch

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0b1bdeac..b168e6a4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -97,7 +97,7 @@ if (ENABLE_MORE_COMPILER_OPTIMIZATION_FLAGS AND NOT (CMAKE_BUILD_TYPE_UPPER MATC
     if (MSVC)
         set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS} /fp:fast")
     else()
-        set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS} -Ofast -funroll-loops")
+        set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS} -funroll-loops")
     endif()
 endif ()
 
diff --git a/src/communication/CommandLine.cpp b/src/communication/CommandLine.cpp
index e05aebf3..08fe7281 100644
--- a/src/communication/CommandLine.cpp
+++ b/src/communication/CommandLine.cpp
@@ -22,6 +22,8 @@
 #include "../utils/FMatrix4x3.h" //For the mesh_rotation_matrix setting.
 #include "../utils/logoutput.h"
 
+#include <emscripten.h>
+
 namespace cura
 {
 
@@ -80,6 +82,11 @@ void CommandLine::sendProgress(const float& progress) const
         return;
     }
     //TODO: Do we want to print a progress bar? We'd need a better solution to not have that progress bar be ruined by any logging.
+
+    //Call progress handler with progress
+    char js[100];
+    std::sprintf(js, "globalThis[\"cura-wasm-progress-callback\"](%f)", progress);
+    emscripten_run_script(js);
 }
 
 void CommandLine::sliceNext()
diff --git a/src/gcodeExport.cpp b/src/gcodeExport.cpp
index 5d75ea53..725f98c1 100644
--- a/src/gcodeExport.cpp
+++ b/src/gcodeExport.cpp
@@ -19,6 +19,8 @@
 #include "utils/string.h" // MMtoStream, PrecisionedDouble
 #include "WipeScriptConfig.h"
 
+#include <emscripten.h>
+
 namespace cura {
 
 std::string transliterate(const std::string& text)
@@ -273,6 +275,20 @@ std::string GCodeExport::getFileHeader(const std::vector<bool>& extruder_is_used
         prefix << ";MAXZ:" << INT2MM(total_bounding_box.max.z) << new_line;
     }
 
+    //Call metadata handler with metadata
+    char js[200];
+    std::sprintf(
+        js,
+        "globalThis[\"cura-wasm-metadata-callback\"](\"%s\", %d, %d, %d, %f, %d)",
+        flavorToString(flavor).c_str(),
+        ((print_time) ? static_cast<int>(*print_time) : 6666),
+        ((filament_used.size() >= 1)? static_cast<int>(filament_used[0]) : 6666),
+        ((filament_used.size() >= 2)? static_cast<int>(filament_used[1]) : 0),
+        Application::getInstance().current_slice->scene.extruders[0].settings.get<double>("machine_nozzle_size"),
+        int(getTotalFilamentUsed(0))
+    );
+    emscripten_run_script(js);
+
     return prefix.str();
 }