--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/OrthancStone/Sources/Scene2D/MacroSceneLayer.h	Thu Oct 29 17:01:29 2020 +0100
@@ -0,0 +1,89 @@
+/**
+ * Stone of Orthanc
+ * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
+ * Department, University Hospital of Liege, Belgium
+ * Copyright (C) 2017-2020 Osimis S.A., Belgium
+ *
+ * This program is free software: you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * as published by the Free Software Foundation, either version 3 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program. If not, see
+ * <http://www.gnu.org/licenses/>.
+ **/
+
+
+#pragma once
+
+#include "ISceneLayer.h"
+
+#include <Compatibility.h>  // For ORTHANC_OVERRIDE
+
+#include <vector>
+
+namespace OrthancStone
+{
+  /**
+   * A "macro layer" is a group of sublayers that are handled as a
+   * whole.
+   **/
+  class MacroSceneLayer : public ISceneLayer
+  {
+  private:
+    std::vector<ISceneLayer*>  layers_;
+    uint64_t                   revision_;
+
+  protected:
+    void BumpRevision()
+    {
+      // this is *not* thread-safe!!!  => (SJO) no problem, Stone assumes mono-threading
+      revision_++;
+    }
+
+  public:
+    MacroSceneLayer() :
+      revision_(0)
+    {
+    }
+
+    virtual ~MacroSceneLayer()
+    {
+      Clear();
+    }
+
+    void Clear();      
+
+    void Reserve(size_t size)
+    {
+      layers_.reserve(size);
+    }
+
+    void AddLayer(ISceneLayer* layer);  // takes ownership
+
+    size_t GetSize() const
+    {
+      return layers_.size();
+    }
+
+    virtual ISceneLayer* Clone() const ORTHANC_OVERRIDE;
+
+    virtual Type GetType() const ORTHANC_OVERRIDE
+    {
+      return Type_Macro;
+    }
+
+    virtual bool GetBoundingBox(Extent2D& target) const ORTHANC_OVERRIDE;
+
+    virtual uint64_t GetRevision() const ORTHANC_OVERRIDE
+    {
+      return revision_;
+    }
+  };
+}