support different themes for Legacy BIOS mode and UEFI mode

GRUB2/MOD_SRC/grub-2.04/grub-core/ventoy/ventoy_plugin.c

@@ -1180,6 +1180,11 @@ static plugin_entry g_plugin_entries[] =
 {
     { "control", ventoy_plugin_control_entry, ventoy_plugin_control_check },
     { "theme", ventoy_plugin_theme_entry, ventoy_plugin_theme_check },
+#ifdef GRUB_MACHINE_EFI
+    { "theme_uefi", ventoy_plugin_theme_entry, ventoy_plugin_theme_check },
+#else
+    { "theme_legacy", ventoy_plugin_theme_entry, ventoy_plugin_theme_check },
+#endif
     { "auto_install", ventoy_plugin_auto_install_entry, ventoy_plugin_auto_install_check },
     { "persistence", ventoy_plugin_persistence_entry, ventoy_plugin_persistence_check },
     { "menu_alias", ventoy_plugin_menualias_entry, ventoy_plugin_menualias_check },

INSTALL/grub/debug.cfg

@@ -19,6 +19,27 @@ submenu 'Check plugin json configuration (ventoy.json)' --class=debug_json {
         unset pager
     }
     
+    if [ "$grub_platform" = "pc" ]; then
+        menuentry 'Check legacy theme plugin configuration' --class=debug_theme_legacy {
+            set pager=1
+            vt_check_plugin_json $vt_plugin_path theme_legacy $vtoy_iso_part
+            
+            echo -e "\npress ENTER to exit ..."
+            read vtInputKey
+            unset pager
+        }
+    else
+        menuentry 'Check uefi theme plugin configuration' --class=debug_theme_uefi {
+            set pager=1
+            vt_check_plugin_json $vt_plugin_path theme_uefi $vtoy_iso_part
+            
+            echo -e "\npress ENTER to exit ..."
+            read vtInputKey
+            unset pager
+        }
+    fi
+    
+    
     menuentry 'Check auto install plugin configuration' --class=debug_autoinstall {
         set pager=1
         vt_check_plugin_json $vt_plugin_path auto_install $vtoy_iso_part