Fix DialogBrowse crashing when deleting the last item nullptr. In iOS use std::recursive_mutex instead of the custom check.

PanoPainter/GameViewController.m

@@ -39,23 +39,26 @@ int t_count = 0;
 glm::vec2 t_pos;
 int lock_count = 0;
 NSThread* lock_thread;
+std::recursive_mutex lock_mutex;
 
 @implementation GameViewController
 - (void)async_lock
 {
-    if (lock_thread != [NSThread currentThread] || lock_count == 0)
-        [gl_lock lock];
-    lock_thread = [NSThread currentThread];
-    lock_count++;
+    lock_mutex.lock();
+//    if (lock_thread != [NSThread currentThread] || lock_count == 0)
+//        [gl_lock lock];
+//    lock_thread = [NSThread currentThread];
+//    lock_count++;
     [EAGLContext setCurrentContext:self.context];
     GLKView* view = (GLKView*)self.view;
     [view bindDrawable];
 }
 - (void)async_unlock
 {
-    lock_count--;
-    if (lock_count == 0)
-        [gl_lock unlock];
+//    lock_count--;
+//    if (lock_count == 0)
+//        [gl_lock unlock];
+    lock_mutex.unlock();
 }
 - (void)async_swap
 {

src/canvas.cpp

@@ -1530,12 +1530,31 @@ void ui::Canvas::project_save_thread(std::string file_path)
 
 //     static char name[128];
 //     sprintf(name, "%s/latlong.ppi", data_path.c_str());
-    FILE* fp = fopen(file_path.c_str(), "wb");
-    if (!fp)
+    FILE* fp;
+    
+    std::string tmp_path = file_path.substr(0, file_path.size() - strlen(".ppi")) + ".tmp.ppi";
+    bool use_tmp = false;
+    // check if file already exists
+    if ((fp = fopen(file_path.c_str(), "rb")))
+    {
+        fclose(fp);
+        // use tmp file for writing
+        use_tmp = true;
+        if (!(fp = fopen(tmp_path.c_str(), "wb")))
         {
             LOG("cannot write project to %s", file_path.c_str());
             return;
         }
+    }
+    else
+    {
+        // write directly to the new file
+        if (!(fp = fopen(file_path.c_str(), "wb")))
+        {
+            LOG("cannot write project to %s", file_path.c_str());
+            return;
+        }
+    }
 
     PPIHeader ppi_header;
     fwrite(&ppi_header, sizeof(PPIHeader), 1, fp);
@@ -1601,7 +1620,7 @@ void ui::Canvas::project_save_thread(std::string file_path)
                 };
                 int ret = stbi_write_png_to_func(callback, &compressed, sz.x, sz.y, 4, snap.image[plane_index].get(), sz.x * 4);
                 
-                int data_size = compressed.size();
+                int data_size = (int)compressed.size();
                 fwrite(&data_size, sizeof(int), 1, fp);
                 
                 fwrite(compressed.data(), 1, compressed.size(), fp);
@@ -1616,10 +1635,30 @@ void ui::Canvas::project_save_thread(std::string file_path)
         }
     }
     fclose(fp);
+    if (use_tmp)
+    {
+        LOG("project saved tmp to %s", tmp_path.c_str());
+        LOG("swapping to %s", file_path.c_str());
+        if (std::remove(file_path.c_str()) == 0)
+        {
+            if (std::rename(tmp_path.c_str(), file_path.c_str()) == 0)
+            {
+                LOG("tmp file swapped succesfully");
+            }
+            else
+            {
+                LOG("tmp file NOT swapped, original removed");
+            }
+        }
+        else
+        {
+            LOG("could not remove %s", file_path.c_str());
+        }
+    }
+    else
+    {
         LOG("project saved to %s", file_path.c_str());
-
-//     App::I.upload(data_path);
-//     LOG("uploaded");
+    }
 
     m_unsaved = false;
     m_newdoc = false;

src/node_dialog_browse.cpp

@@ -47,6 +47,8 @@ void NodeDialogBrowse::init_controls()
         msgbox->btn_ok->on_click = [this,msgbox](Node*){
             auto path = current->m_path;
             int idx = container->get_child_index(current);
+            if (auto image_tex = current->find<NodeImageTexture>("thumb-tex"))
+                image_tex->tex.destroy();
             container->remove_child(current);
             if (!container->m_children.empty())
             {
@@ -59,8 +61,6 @@ void NodeDialogBrowse::init_controls()
             else
             {
                 current = nullptr;
-                auto image_tex = find<NodeImageTexture>("thumb-tex");
-                image_tex->tex.destroy();
             }
             Asset::delete_file(path);
             msgbox->destroy();
@@ -94,10 +94,11 @@ void NodeDialogBrowse::init_controls()
         };
 
         // load thumb
-        auto image_tex = node->find<NodeImageTexture>("thumb-tex");
+        if (auto image_tex = node->find<NodeImageTexture>("thumb-tex"))
+        {
             image_tex->tex.destroy();
             image_tex->tex.create(thumb);
-
+        }
         container->add_child(node);
     }
 //     if (auto* first = (NodeDialogBrowseItem*)container->get_child_at(0))