ENH: Added GDALOverviewsBuilder::ListResolutions().

Modules/IO/IOGDAL/include/otbGDALOverviewsBuilder.h

@@ -21,6 +21,7 @@
 
 // #include "itkLightObject.h"
 #include "itkProcessObject.h"
+#include "itkSize.h"
 
 #include "otbGDALDatasetWrapper.h"
 #include "otbConfigure.h"
@@ -84,6 +85,9 @@ public:
   typedef itk::SmartPointer< Self> Pointer;
   typedef itk::SmartPointer< const Self > ConstPointer;
 
+  typedef itk::Size< 2 > Size;
+  typedef std::vector< Size > SizeVector;
+
   /** Method for creation through the object factory. */
   itkNewMacro( Self );
 
@@ -94,8 +98,11 @@ public:
   unsigned int
   CountResolutions( unsigned int factor, unsigned int n =0 ) const;
 
-  unsigned int GetOverviewsCount() const;
+  void ListResolutions( SizeVector &, unsigned int factor, unsigned int count );
 
+  void ListResolutions( SizeVector & );
+
+  unsigned int GetOverviewsCount() const;
 
   GDALResampling GetResamplingMethod() const;
 
@@ -131,6 +138,7 @@ public:
 
 protected:
   GDALOverviewsBuilder();
+
   virtual ~GDALOverviewsBuilder() {};
 
   void PrintSelf( std::ostream & os, itk::Indent indent ) const;

Modules/IO/IOGDAL/src/otbGDALOverviewsBuilder.cxx

@@ -103,7 +103,7 @@ GDALOverviewsBuilder
 
   unsigned int minSize = static_cast< unsigned int >( pow( factor, n ) );
 
-  unsigned int count = 1;
+  unsigned int count = 0;
 
   unsigned int size =
     std::min(
@@ -121,6 +121,37 @@ GDALOverviewsBuilder
   return count;
 }
 
+/***************************************************************************/
+void
+GDALOverviewsBuilder
+::ListResolutions( SizeVector & sizes )
+{
+  ListResolutions( sizes, m_ResolutionFactor, m_NbResolutions );
+}
+
+/***************************************************************************/
+void
+GDALOverviewsBuilder
+::ListResolutions( SizeVector & sizes, unsigned int factor, unsigned int count )
+{
+  assert( !m_GdalDataset.IsNull() );
+
+  Size s;
+
+  s[ 0 ] = m_GdalDataset->GetWidth();
+  s[ 1 ] = m_GdalDataset->GetHeight();
+
+  unsigned int n = std::min( count, CountResolutions( factor, 0 ) );
+
+  for( unsigned int i=0; i<n; ++i )
+    {
+    sizes.push_back( s );
+
+    s[ 0 ] /= factor;
+    s[ 1 ] /= factor;
+    }
+}
+
 /***************************************************************************/
 unsigned int
 GDALOverviewsBuilder