r.grow
r.grow - Generates a raster layer with contiguous areas grown by one cell.
Raster (r.*)
ParameterRaster|input|input raster layer|False
ParameterNumber|radius|Radius of buffer in raster cells|None|None|1.01
ParameterSelection|metric|Metric|euclidean;maximum;manhattan
ParameterNumber|old|Value to write for input cells which are non-NULL (-1 => NULL)|None|None|0
ParameterNumber|new|Value to write for "grown" cells|None|None|1
OutputRaster|output|Output layer