grid: only use mutexes when multithreading support is enabled (#1377)

strukturag · Nov 9, 2024 · 3ce6149 · 3ce6149
1 parent 4cf6b04
commit 3ce6149
Showing 1 changed file with 5 additions and 1 deletion.
diff --git a/libheif/image-items/grid.cc b/libheif/image-items/grid.cc
@@ -445,9 +445,11 @@ Error ImageItem_Grid::decode_and_paste_tile_image(heif_item_id tileID, uint32_t
 
   // --- generate the image canvas for combining all the tiles
 
-  if (!inout_image) { // this if avoids that we normally have to lock a mutex
+  if (!inout_image) { // this avoids that we normally have to lock a mutex
+#if ENABLE_MULTITHREADING_SUPPORT
     static std::mutex createImageMutex;
     std::lock_guard<std::mutex> lock(createImageMutex);
+#endif
 
     if (!inout_image) {
       inout_image = std::make_shared<HeifPixelImage>();
@@ -479,8 +481,10 @@ Error ImageItem_Grid::decode_and_paste_tile_image(heif_item_id tileID, uint32_t
   inout_image->copy_image_to(tile_img, x0, y0);
 
   if (options.on_progress) {
+#if ENABLE_MULTITHREADING_SUPPORT
     static std::mutex progressMutex;
     std::lock_guard<std::mutex> lock(progressMutex);
+#endif
 
     options.on_progress(heif_progress_step_total, ++progress_counter, options.progress_user_data);
   }