Make HUD loading lazy upon first show.

diff --git a/src/Instrumentation/HUD/HUD.cxx b/src/Instrumentation/HUD/HUD.cxx
index 8c112aef6c1ee785ec2b45a17c424404ba6874cc..22476c92254564375a2a8e51ce233cf801b9f324 100644 (file)
--- a/src/Instrumentation/HUD/HUD.cxx
+++ b/src/Instrumentation/HUD/HUD.cxx
@@ -66,6 +66,7 @@ HUD::HUD() :
     _alpha_clamp(fgGetNode("/sim/hud/color/alpha-clamp", true)),
     _brightness(fgGetNode("/sim/hud/color/brightness", true)),
     _visible(false),
+    _loaded(false),
     _antialiased(false),
     _transparent(false),
     _a(0.67),                                                                  // FIXME better names
@@ -115,7 +116,8 @@ void HUD::init()
     _font_renderer->setFont(_font);
     _font_renderer->setPointSize(_font_size);
     _text_list.setFont(_font_renderer);
-
+    _loaded = false;
+  
     currentColorChanged();
     _currentPath->fireValueChanged();
 }
@@ -134,6 +136,8 @@ void HUD::deinit()
   
   delete _clip_box;
   _clip_box = NULL;
+  
+  _loaded = false;
 }
 
 void HUD::reinit()
@@ -427,16 +431,28 @@ void HUD::valueChanged(SGPropertyNode *node)
     if (_listener_active)
         return;
     _listener_active = true;
-    if (!strcmp(node->getName(), "current-path")) {
-        int pathIndex = _currentPath->getIntValue();
-        SGPropertyNode* pathNode = fgGetNode("/sim/hud/path", pathIndex);
-        std::string path("Huds/default.xml");
-        if (pathNode && pathNode->hasValue()) {
-            path = pathNode->getStringValue();
-            SG_LOG(SG_INSTR, SG_INFO, "will load Hud from " << path);
-        }
+  
+    bool loadNow = false;
+    _visible = _visibility->getBoolValue();
+    if (_visible && !_loaded) {
+      loadNow = true;
+    }
+  
+    if (!strcmp(node->getName(), "current-path") && _visible) {
+      loadNow = true;
+    }
+  
+    if (loadNow) {
+      int pathIndex = _currentPath->getIntValue();
+      SGPropertyNode* pathNode = fgGetNode("/sim/hud/path", pathIndex);
+      std::string path("Huds/default.xml");
+      if (pathNode && pathNode->hasValue()) {
+        path = pathNode->getStringValue();
+        SG_LOG(SG_INSTR, SG_INFO, "will load Hud from " << path);
+      }
       
-        load(path.c_str());
+      _loaded = true;
+      load(path.c_str());
     }
   
     if (!strcmp(node->getName(), "current-color")) {
@@ -446,7 +462,7 @@ void HUD::valueChanged(SGPropertyNode *node)
     _scr_width = _scr_widthN->getIntValue();
     _scr_height = _scr_heightN->getIntValue();
 
-    _visible = _visibility->getBoolValue();
+    
     _3Denabled = _3DenabledN->getBoolValue();
     _transparent = _transparency->getBoolValue();
     _antialiased = _antialiasing->getBoolValue();

diff --git a/src/Instrumentation/HUD/HUD.hxx b/src/Instrumentation/HUD/HUD.hxx
index f10c580f8844a068affc551ab78408b6fa405ad9..ade3d88dbe4af3fa877ef905648b198e648a822b 100644 (file)
--- a/src/Instrumentation/HUD/HUD.hxx
+++ b/src/Instrumentation/HUD/HUD.hxx
@@ -228,6 +228,7 @@ private:
     SGPropertyNode_ptr _alpha_clamp;
     SGPropertyNode_ptr _brightness;
     bool _visible;
+    bool _loaded;
     bool _3Denabled;
     bool _antialiased;
     bool _transparent;