[FFmpeg-devel] [PATCH 1/2 v2] avutil: add a Tile Grid API

[Anton Khirnov]

Quoting James Almer (2024-01-22 12:59:52)
> > 
> > I don't see how is that supposed to work. E.g. consider the following
> > partitioning:
> > ┌─┬────┬─┐
> > │ │    ├─┤
> > ├─┤    │ │
> > │ ├────┤ │
> > └─┴────┴─┘
> > 
> > How would you represent it in this API?
> 
> That's two rows and three columns. Lets assume the smallest rectangle 
> there is 1x1:
> 
> 1x2 2x3 1x1
> 1x2 2x1 1x3
> 
> Meaning
> 
> tile_width[] = { 1, 2, 1, 1, 2, 1 };
> tile_height[] = { 2, 3, 1, 2, 1, 3 };
> 
> As long as the sum of widths on every row and the sum of heights on 
> every column is the same (To ensure you get a rectangle), it can be 
> represented.
> 
> If what you're trying to say is "What about offsets?", they can be 
> inferred based on dimensions and position of previous tiles within the grid.
> I don't think adding yet another array to store offsets is worth it. But 
> maybe a helper function that will build it?

This seems horribly obfuscated to me. Why do the users of this API have
to deal with all this? Why are the notions of "tile rows", "tile
columns", and "tiles" necessary?

-- 
Anton Khirnov