From 0e652cdcfd509fdde56afa2ad7b24dafd50af154 Mon Sep 17 00:00:00 2001
From: lemort
Date: Tue, 22 Jan 2008 08:33:42 +0000
Subject: Ajout de l'item viewport qui permet de deleguer le rendu dans une
 zone rectangulaire a une librairie externe. Pour l'instant, seule
 l'implementation Windows fonctionne: le rendu est deleguea une DLL qui doit
 contenir certaines fonctions

---
 generic/Group.c | 67 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 67 insertions(+)

(limited to 'generic/Group.c')

diff --git a/generic/Group.c b/generic/Group.c
index 8a1f668..cee860d 100644
--- a/generic/Group.c
+++ b/generic/Group.c
@@ -1043,6 +1043,72 @@ Draw(ZnItem     item)
 }
 
 
+
+/*
+ **********************************************************************************
+ *
+ * PreRender --
+ *
+ **********************************************************************************
+ */
+#ifdef GL
+static void
+PreRender(ZnItem   item)
+{
+  GroupItem     group = (GroupItem) item;
+  ZnItem        current_item;
+  ZnWInfo       *wi = item->wi;
+  unsigned char save_alpha = wi->alpha;
+  unsigned char save_alpha2;
+
+  if (ISSET(item->flags, ZN_COMPOSE_ALPHA_BIT)) {
+    wi->alpha = wi->alpha * group->alpha / 100;
+  }
+  else {
+    wi->alpha = group->alpha;
+  }
+  save_alpha2 = wi->alpha;
+
+  PushTransform(item);
+ 
+  current_item = group->tail;
+  while (current_item != ZN_NO_ITEM) {
+    if (ISSET(current_item->flags, ZN_VISIBLE_BIT)) {
+
+      if (  current_item->class->PreRender != NULL )
+      {
+        if (current_item->class != ZnGroup) {
+          PushTransform(current_item);
+          if (ISCLEAR(current_item->flags, ZN_COMPOSE_ALPHA_BIT)) {
+            wi->alpha = 100;
+          }
+        }
+        
+        current_item->class->PreRender(current_item);
+        
+        if (current_item->class != ZnGroup) {
+          PopTransform(current_item);
+          wi->alpha = save_alpha2;
+        }
+      }
+    }
+    current_item = current_item->previous;
+  }
+
+  PopTransform(item);
+
+  wi->alpha = save_alpha;
+}
+#else
+static void
+PreRender(ZnItem   item)
+{
+}
+#endif
+
+
+
+
 /*
  **********************************************************************************
  *
@@ -1818,6 +1884,7 @@ static ZnItemClassStruct GROUP_ITEM_CLASS = {
   ComputeCoordinates,
   ToArea,
   Draw,
+  PreRender,            /* Pre-render */
   Render,
   IsSensitive,
   Pick,
-- 
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