Function getScreenMapData

src/platforms/wasm/js_bindings.cpp.hpp:91–146

* ScreenMap Export Function * Exports screenMap data as JSON string with size information * Returns malloc'd buffer that must be freed with freeFrameData() */

 * Returns malloc'd buffer that must be freed with freeFrameData()
 */
EMSCRIPTEN_KEEPALIVE void* getScreenMapData(int* dataSize) {
    fl::ActiveStripData& active_strips = fl::ActiveStripData::Instance();
    const auto& screenMaps = active_strips.getScreenMaps();

    // Create dictionary of screenmaps (stripId → screenmap object)
    // Same format as _jsSetCanvasSize() to match JavaScript expectations
    fl::json root = fl::json::object();

    // Build a separate screenmap object for each strip
    for (const auto &[stripIndex, screenMap] : screenMaps) {
        // Create this strip's screenmap object
        fl::json screenMapObj = fl::json::object();

        // Create strips object containing only this strip
        fl::json stripsObj = fl::json::object();
        fl::json stripMapObj = fl::json::object();

        fl::json mapObj = fl::json::object();
        fl::json xArray = fl::json::array();
        fl::json yArray = fl::json::array();

        for (fl::u32 i = 0; i < screenMap.getLength(); i++) {
            float x = screenMap[i].x;
            float y = screenMap[i].y;

            xArray.push_back(fl::json(x));
            yArray.push_back(fl::json(y));
        }

        mapObj.set("x", xArray);
        mapObj.set("y", yArray);
        stripMapObj.set("map", mapObj);

        // Add diameter
        stripMapObj.set("diameter", screenMap.getDiameter());

        // Add this strip to the strips object
        stripsObj.set(fl::to_string(stripIndex), stripMapObj);

        // Set strips object
        screenMapObj.set("strips", stripsObj);

        // Add this screenmap to the root dictionary
        root.set(fl::to_string(stripIndex), screenMapObj);
    }

    // Serialize to JSON
    fl::string json_str = root.to_string();

    // Allocate and return data pointer
    char* buffer = (char*)fl::malloc(json_str.length() + 1);
    fl::strcpy(buffer, json_str.c_str());
    *dataSize = json_str.length();

    return buffer;
}

/**