Add generic source wrapping a RealRandomAccessible. Useful for

procedurally generated sources.

core/src/main/java/bdv/util/RealRandomAccessibleSource.java

+package bdv.util;
+
+import net.imglib2.Interval;
+import net.imglib2.RandomAccessibleInterval;
+import net.imglib2.RealRandomAccessible;
+import net.imglib2.realtransform.AffineTransform3D;
+import net.imglib2.type.Type;
+import net.imglib2.util.Util;
+import net.imglib2.view.Views;
+import bdv.viewer.Interpolation;
+import bdv.viewer.Source;
+
+/**
+ * A {@link Source} wrapping some {@link RealRandomAccessible}. Derived concrete
+ * classes must implement {@link #getInterval(int, int)} to specify which
+ * interval to use for {@link #getSource(int, int)}.
+ *
+ * @param <T>
+ *
+ * @author Tobias Pietzsch <tobias.pietzsch@gmail.com>
+ */
+public abstract class RealRandomAccessibleSource< T extends Type< T > > implements Source< T >
+{
+	protected RealRandomAccessible< T > accessible;
+
+	protected final T type;
+
+	protected final String name;
+
+	public RealRandomAccessibleSource( final RealRandomAccessible< T > accessible, final String name )
+	{
+		this.accessible = accessible;
+		this.type = Util.getTypeFromRealRandomAccess( accessible ).createVariable();
+		this.name = name;
+	}
+
+	@Override
+	public boolean isPresent( final int t )
+	{
+		return true;
+	}
+
+	/**
+	 * Return the interval which should be used to bound the wrapped
+	 * (unbounded) {@link RealRandomAccessible} for {@link #getSource(int, int)}.
+	 *
+	 * @return image interval
+	 */
+	public abstract Interval getInterval( final int t, final int level );
+
+	@Override
+	public RandomAccessibleInterval< T > getSource( final int t, final int level )
+	{
+		return Views.interval( Views.raster( accessible ), getInterval( t, level ) );
+	}
+
+	@Override
+	public RealRandomAccessible< T > getInterpolatedSource( final int t, final int level, final Interpolation method )
+	{
+		return accessible;
+	}
+
+	@Override
+	public AffineTransform3D getSourceTransform( final int t, final int level )
+	{
+		return new AffineTransform3D();
+	}
+
+	@Override
+	public T getType()
+	{
+		return type;
+	}
+
+	@Override
+	public String getName()
+	{
+		return name;
+	}
+
+	@Override
+	public int getNumMipmapLevels()
+	{
+		return 1;
+	}
+}