custom tiles type

Hi,
many thanks for this fantastic plugin!
I haven’t found any other free plugin with so many features, options and possibility to define own extensions.

I would like to better understand the handling of parameters for the filter vpf_extend_tiles [ $tiles ] – custom tiles.
Here below a basic example, but this is applicable to more complex layouts.
I would like to get something like:
|big image |
|small| |small|
i.e. a big image on first row and then 2 small images on the second row
then I tried the filter with :
‘value’ => ‘2|2,1|1,1|1,1|’,
but I get:
|big image |
|small|
|small|
i.e. in the second row only 1 image is present and a new row is created for the 3rd image.

When using :
‘value’ => ‘2|1,1|1,1|2,1|’,
the I get what I expect:
|small| |small|
|big image |

could you please share some more details on the logic applied for these parameters? It seems that given a “first column width” in the first row, then all other rows can’t have a smaller “first column width”, or at least I couldn’t understand how to get it.

many thanks