exposed FirstTileWins fusion as cmd-line parameter

src/main/java/net/preibisch/bigstitcher/spark/SparkAffineFusion.java

@@ -117,6 +117,9 @@ public class SparkAffineFusion extends AbstractSelectableViews implements Callab
 	@Option(names = { "--masks" }, description = "save only the masks (this will not fuse the images)")
 	private boolean masks = false;
 
+	@Option(names = { "--firstTileWins" }, description = "use firstTileWins fusion strategy (default: false - using weighted average blending fusion)")
+	private boolean firstTileWins = false;
+
 	@Option(names = "--maskOffset", description = "allows to make masks larger (+, the mask will include some background) or smaller (-, some fused content will be cut off), warning: in the non-isotropic coordinate space of the raw input images (default: 0.0,0.0,0.0)")
 	private String maskOffset = "0.0,0.0,0.0";
 
@@ -369,7 +372,8 @@ else if ( uint16 )
 				uint16,
 				minIntensity,
 				range,
-				blockSize ) );
+				blockSize,
+				firstTileWins ) );
 
 		if ( this.downsamplings != null )
 		{

src/main/java/net/preibisch/bigstitcher/spark/fusion/WriteSuperBlock.java

@@ -87,6 +87,8 @@ public class WriteSuperBlock implements VoidFunction< long[][] >
 
 	private final int[] blockSize;
 
+	private final boolean firstTileWins;
+
 	public WriteSuperBlock(
 			final String xmlPath,
 			final boolean preserveAnisotropy,
@@ -101,7 +103,8 @@ public WriteSuperBlock(
 			final boolean uint16,
 			final double minIntensity,
 			final double range,
-			final int[] blockSize )
+			final int[] blockSize,
+			final boolean firstTileWins )
 	{
 		this.xmlPath = xmlPath;
 		this.preserveAnisotropy = preserveAnisotropy;
@@ -117,6 +120,7 @@ public WriteSuperBlock(
 		this.minIntensity = minIntensity;
 		this.range = range;
 		this.blockSize = blockSize;
+		this.firstTileWins = firstTileWins;
 	}
 
 	/**
@@ -246,14 +250,28 @@ else if ( uint16 )
 				else
 					type = new FloatType();
 
-//				final RandomAccessibleInterval< NativeType > source = Fusion.fuseVirtual(
-				final RandomAccessibleInterval< NativeType > source = FusionFirstWins.fuseVirtual(
-						dataLocal,
-						overlappingBlocks.overlappingViews(),
-						fusedBlock,
-						type,
-						minIntensity,
-						range );
+				final RandomAccessibleInterval< NativeType > source;
+
+				if ( firstTileWins )
+				{
+					source = FusionFirstWins.fuseVirtual(
+							dataLocal,
+							overlappingBlocks.overlappingViews(),
+							fusedBlock,
+							type,
+							minIntensity,
+							range );
+				}
+				else
+				{
+					source = Fusion.fuseVirtual(
+							dataLocal,
+							overlappingBlocks.overlappingViews(),
+							fusedBlock,
+							type,
+							minIntensity,
+							range );
+				}
 
 				N5Helper.saveBlock( source, executorVolumeWriter, n5Dataset, gridPos );
 			}