add iOS and macOS icons

src/app.cpp

@@ -53,9 +53,11 @@ void App::open_document(std::string path)
     std::smatch m;
     if (!std::regex_search(path, m, r))
         return;
+    std::string base = m[1].str();
+    std::string name = m[2].str();
     std::string ext = m[3].str();
 
-    if (str_iequals(m[3].str(), "abr"))
+    if (str_iequals(ext, "abr"))
     {
         auto mb = message_box("Import ABR", "Would you like to import the brushes?", true);
         mb->on_submit = [this, path] (Node* target) {
@@ -63,7 +65,7 @@ void App::open_document(std::string path)
             target->destroy();
         };
     }
-    else if (str_iequals(m[3].str(), "ppbr"))
+    else if (str_iequals(ext, "ppbr"))
     {
         auto mb = message_box("Import PPBR", "Would you like to import the brushes?", true);
         mb->on_submit = [this, path] (Node* target) {
@@ -73,9 +75,9 @@ void App::open_document(std::string path)
     }
     else
     {
-        auto open_action = [this, path, m] {
-            doc_name = m[2].str();
-            doc_dir = m[1].str();
+        auto open_action = [this, path, base, name] {
+            doc_name = name;
+            doc_dir = base;
             doc_path = path;
             canvas->reset_camera();
             layers->clear();

src/asset.cpp

@@ -33,8 +33,11 @@ bool Asset::exist(std::string path)
     }
     else
     {
-        std::ifstream f(path, std::ios::binary);
-        return f.is_open();
+        FILE* fp = fopen(path.c_str(), "rb");
+        if (!fp)
+            return false;
+        fclose(fp);
+        return true;
     }
     return false; // useless return for the stupid xcode 
 }

src/node_message_box.cpp

@@ -19,7 +19,10 @@ void NodeMessageBox::init()
     m_title = m_template->find<NodeText>("title");
     m_message = m_template->find<NodeText>("message");
     btn_ok = m_template->find<NodeButton>("btn-ok");
-    btn_ok->on_click = [&](Node*) { destroy(); };
+    btn_ok->on_click = [&](Node*) {
+        if (on_submit)
+            on_submit(this);
+    };
     btn_cancel = m_template->find<NodeButton>("btn-cancel");
     on_submit = btn_cancel->on_click = [&](Node*) { destroy(); };
     m_capture_children = false; // don't capture children events on mouse_capture

src/node_panel_brush.cpp

@@ -940,17 +940,13 @@ bool NodePanelBrushPreset::import_ppbr(const std::string& path)
     return false;
 }
 
-bool NodePanelBrushPreset::import_abr(const std::string& path_in)
+bool NodePanelBrushPreset::import_abr(const std::string& path)
 {
     BT_SetTerminate();
 
     ABR abr;
     LOG("ABR detected");
 
-    std::string path = path_in;
-    if (path_in.find(".abr") == std::string::npos)
-        path += ".abr";
-
     std::string name, base, ext;
     std::regex r(R"((.*)[\\/]([^\\/]+)\.(\w+)$)");
     std::smatch m;