ENH: fallback to tiling=none when layout size is 1

include/lsgrmController.txx

@@ -30,9 +30,6 @@ void Controller<TSegmenter>::RunSegmentation()
   if (m_TilingMode == LSGRM_TILING_AUTO || m_TilingMode == LSGRM_TILING_USER)
     {
 
-    const unsigned int numberOfIterationsForPartialSegmentations = 3; // TODO: find a smart value
-    unsigned int numberOfIterationsRemaining = m_NumberOfIterations;
-
     if(m_TilingMode == LSGRM_TILING_AUTO)
       {
       this->GetAutomaticConfiguration();
@@ -55,6 +52,16 @@ void Controller<TSegmenter>::RunSegmentation()
     m_Tiles = SplitOTBImage<ImageType>(m_InputImage, m_TileWidth, m_TileHeight, m_Margin,
         m_NbTilesX, m_NbTilesY, m_TemporaryFilesPrefix);
 
+    // If there is only one tile, then fallback to LSGRM_TILING_NONE case
+    m_TilingMode = LSGRM_TILING_NONE;
+    }
+
+  if (m_TilingMode == LSGRM_TILING_AUTO || m_TilingMode == LSGRM_TILING_USER)
+    {
+
+    const unsigned int numberOfIterationsForPartialSegmentations = 3; // TODO: find a smart value
+    unsigned int numberOfIterationsRemaining = m_NumberOfIterations;
+
     // Boolean indicating if there are remaining fusions
     bool isFusion = false;