Cleanup: convert compositor nodes to c++

- Many cleanups of to use list base
- Some variable changes

These change is needed to migrate to the new socket builder API

Reviewed By: manzanilla

Differential Revision: https://developer.blender.org/D12366

source/blender/nodes/composite/node_composite_util.cc

@@ -0,0 +1,56 @@
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * The Original Code is Copyright (C) 2006 Blender Foundation.
+ * All rights reserved.
+ */
+
+/** \file
+ * \ingroup nodes
+ */
+
+#include "node_composite_util.hh"
+
+bool cmp_node_poll_default(bNodeType *UNUSED(ntype),
+                           bNodeTree *ntree,
+                           const char **r_disabled_hint)
+{
+  if (!STREQ(ntree->idname, "CompositorNodeTree")) {
+    *r_disabled_hint = "Not a compositor node tree";
+    return false;
+  }
+  return true;
+}
+
+void cmp_node_update_default(bNodeTree *UNUSED(ntree), bNode *node)
+{
+  LISTBASE_FOREACH (bNodeSocket *, sock, &node->outputs) {
+    if (sock->cache) {
+      // free_compbuf(sock->cache);
+      // sock->cache = nullptr;
+    }
+  }
+  node->need_exec = 1;
+}
+
+void cmp_node_type_base(bNodeType *ntype, int type, const char *name, short nclass, short flag)
+{
+  node_type_base(ntype, type, name, nclass, flag);
+
+  ntype->poll = cmp_node_poll_default;
+  ntype->updatefunc = cmp_node_update_default;
+  ntype->insert_link = node_insert_link_default;
+  ntype->update_internal_links = node_update_internal_links_default;
+}