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I am looking for a way to convert a polygon into rectangles by filling up the polygon with resctangles.
This also for polygons with holes inside
In Cadence the command dbLayerTile is used to this
there is the "Fill tool" in "Edit/Utilities/Fill Tool". However, this tool requires a fill cell to be drawn separately and then used to fill (tile) a selected region. You can chose "Selected Shapes" for the Fill Area to fill the polygons you want.
There are some limitation like the tiling being confined to rectangular grids.
Here is some documentation about this tool: https://www.klayout.de/doc-qt4/manual/tiling.html.