fixes for QgsRasterInterface subclassing in Python

Author: blazek

python/core/qgsrasterinterface.sip

@@ -84,22 +84,31 @@ class QgsRasterInterface
 
     virtual double noDataValue() const;
 
-    //void * block( int bandNo, QgsRectangle  const & extent, int width, int height );
+    virtual void * block( int bandNo, const QgsRectangle  & extent, int width, int height );
 
-    //virtual void * readBlock( int bandNo, QgsRectangle  const & extent, int width, int height );
+    virtual void * readBlock( int bandNo, const QgsRectangle & extent, int width, int height );
 
     virtual bool setInput( QgsRasterInterface* input );
 
+    virtual QgsRasterInterface * input () const;
+
     virtual bool on( );
 
     virtual void setOn( bool on );
 
-    virtual QgsRasterInterface * srcInput();
+    QgsRasterInterface * srcInput();
 
     QImage * createImage( int width, int height, QImage::Format format );
 
     void setStatsOn( bool on );
 
     double time( bool cumulative = false );
+
+    static QString printValue( double value );
+
+  protected:
+    static double readValue( void *data, QgsRasterInterface::DataType type, int index );
+
+    static void writeValue( void *data, QgsRasterInterface::DataType type, int index, double value );
 };
 

src/core/raster/qgsrasterfilewriter.cpp

@@ -12,6 +12,8 @@
  *   (at your option) any later version.                                   *
  *                                                                         *
  ***************************************************************************/
+#include <typeinfo>
+
 #include "qgsrasterfilewriter.h"
 #include "qgsproviderregistry.h"
 #include "qgsrasterinterface.h"
@@ -65,11 +67,14 @@ QgsRasterFileWriter::WriterError QgsRasterFileWriter::writeRaster( const QgsRast
     return SourceProviderError;
   }
 
+  QgsDebugMsg( QString( "reading from %1" ).arg( typeid( *iface ).name() ) );
+
   if ( !iface->srcInput() )
   {
     QgsDebugMsg( "iface->srcInput() == 0" );
     return SourceProviderError;
   }
+  QgsDebugMsg( QString( "srcInput = %1" ).arg( typeid( *( iface->srcInput() ) ).name() ) );
 
   mProgressDialog = progressDialog;
 

src/core/raster/qgsrasterinterface.h

@@ -178,6 +178,9 @@ class CORE_EXPORT QgsRasterInterface
       * Returns true if set correctly, false if cannot use that input */
     virtual bool setInput( QgsRasterInterface* input ) { mInput = input; return true; }
 
+    /** Current input */
+    virtual QgsRasterInterface * input() const { return mInput; }
+
     /** Is on/off */
     virtual bool on( ) { return mOn; }
 
@@ -188,8 +191,16 @@ class CORE_EXPORT QgsRasterInterface
      *  It may be used to get info about original data, e.g. resolution to decide
      *  resampling etc.
      */
-    virtual const QgsRasterInterface * srcInput() const { return mInput ? mInput->srcInput() : this; }
-    virtual QgsRasterInterface * srcInput() { return mInput ? mInput->srcInput() : this; }
+    virtual const QgsRasterInterface * srcInput() const
+    {
+      QgsDebugMsg( "Entered" );
+      return mInput ? mInput->srcInput() : this;
+    }
+    virtual QgsRasterInterface * srcInput()
+    {
+      QgsDebugMsg( "Entered" );
+      return mInput ? mInput->srcInput() : this;
+    }
 
     /** Create a new image with extraneous data, such data may be used
      *  after the image is destroyed. The memory is not initialized.