Up to R12 DXF allows not to define default layer "0".

--HG--
branch : feature

src/libs/vdxf/dxiface.cpp

@@ -25,7 +25,6 @@ dx_iface::dx_iface(const std::string &file, DRW::Version v, VarMeasurement varMe
       version(v)
 {
     InitHeader(varMeasurement, varInsunits);
-    InitDefLayers();
     InitTextstyles();
     InitAppId();
 }
@@ -277,7 +276,7 @@ void dx_iface::AddAAMALayers()
 //    cData.layers.push_back(layer);
 }
 
-void dx_iface::InitDefLayers()
+void dx_iface::AddDefLayers()
 {
     DRW_Layer defLayer;
     defLayer.name = "0";

src/libs/vdxf/dxiface.h

@@ -121,6 +121,7 @@ public:
     void AddBlock(dx_ifaceBlock* block);
 
     void AddQtLTypes();
+    void AddDefLayers();
     void AddAAMALayers();
 
 private:
@@ -130,7 +131,6 @@ private:
     DRW::Version version;
 
     void InitHeader(VarMeasurement varMeasurement, VarInsunits varInsunits);
-    void InitDefLayers();
     void InitTextstyles();
     void InitAppId();
 

src/libs/vdxf/libdxfrw/libdxfrw.cpp

@@ -1478,7 +1478,7 @@ bool dxfRW::writeTables() {
     writer->writeInt16(70, 1); //end table def
     wlayer0 =false;
     iface->writeLayers();
-    if (!wlayer0) {
+    if (!wlayer0 && version > DRW::AC1009) {
         DRW_Layer lay0;
         lay0.name = "0";
         writeLayer(&lay0);

src/libs/vdxf/vdxfengine.cpp

@@ -111,6 +111,7 @@ bool VDxfEngine::begin(QPaintDevice *pdev)
 
     input = QSharedPointer<dx_iface>(new dx_iface(fileName.toStdString(), m_version, varMeasurement, varInsunits));
     input->AddQtLTypes();
+    input->AddDefLayers();
     return true;
 }
 
@@ -612,6 +613,10 @@ bool VDxfEngine::ExportToAAMA(const QVector<VLayoutPiece> &details)
     }
 
     input = QSharedPointer<dx_iface>(new dx_iface(fileName.toStdString(), m_version, varMeasurement, varInsunits));
+    if (m_version > DRW::AC1009)
+    {
+        input->AddDefLayers();
+    }
     input->AddAAMALayers();
 
     ExportAAMAGlobalText(input, details);