ImGuiManager: Use default icons when unspecified

dep/imgui/include/IconsEmoji.h

@@ -8,6 +8,7 @@
 
 #define ICON_EMOJI_WARNING "\xe2\x9a\xa0"
 #define ICON_EMOJI_CHECKMARK_BUTTON "\xe2\x9c\x85"
+#define ICON_EMOJI_CROSS_MARK_BUTTON "\xe2\x9d\x8c"
 #define ICON_EMOJI_OPTICAL_DISK "\xf0\x9f\x92\xbf"
 #define ICON_EMOJI_FLOPPY_DISK "\xf0\x9f\x92\xbe"
 #define ICON_EMOJI_INFORMATION "\xe2\x84\xb9"
@@ -44,3 +45,5 @@
 #define ICON_EMOJI_INDEX_DIVIDERS "\xf0\x9f\x97\x82"
 #define ICON_EMOJI_CLIPBOARD "\xf0\x9f\x93\x8b"
 #define ICON_EMOJI_NOTEBOOK "\xf0\x9f\x93\x99"
+#define ICON_EMOJI_GEAR "\xe2\x9a\x99"
+#define ICON_EMOJI_NO_ENTRY_SIGN "\xe2\x9b\x94"

src/util/imgui_manager.cpp

@@ -26,6 +26,7 @@
 #include "common/thirdparty/usb_key_code_data.h"
 #include "common/timer.h"
 
+#include "IconsEmoji.h"
 #include "IconsFontAwesome.h"
 #include "fmt/format.h"
 #include "imgui.h"
@@ -847,6 +848,15 @@ void ImGuiManager::AddOSDMessage(OSDMessageType type, std::string key, std::stri
   else
     INFO_LOG("OSD: {}{}{}", title.empty() ? "" : "\n", title, message);
 
+  static constexpr const std::array<const char*, static_cast<size_t>(OSDMessageType::MaxCount)> default_icons = {
+    ICON_EMOJI_NO_ENTRY_SIGN, // Error
+    ICON_EMOJI_WARNING,       // Warning
+    ICON_EMOJI_INFORMATION,   // Info
+    ICON_EMOJI_INFORMATION,   // Quick
+  };
+  if (icon.empty())
+    icon = default_icons[static_cast<size_t>(type)];
+
   std::unique_lock lock(s_state.osd_messages_lock);
   s_state.osd_posted_messages.push_back(PostedOSDMessage{
     .key = std::move(key),