Merge identical sprites.

[ninnghazad]

An option to merge identical sprites and not have multiple versions of the same image in atlas would be nice. Identical as in same pixels after trim.

[urraka]

Hello and thank you for the suggestion. I'll take this into consideration, although I wonder... in what situations do you end up packing identical images? Should it also handle cases where images are identical if rotated or flipped?

[josefnpat]

Maybe identical sprite warnings might be nice? Seems overkill to actually handle that.

[ninnghazad]

I am thinking about animations. In a walkcycle for example i have a char's head bob up and down. The head is it's own sprite. In the final atlas/pack i now have about 20 heads which are all identical pixel-wise, they will just be placed in differently. Detecting (90deg) rotated duplicates would be nice, but simple merge of plain duplicates would be a nice start. And i don't need a warning, i already know that there will be duplicate sprites. There are packers around that offer this feature (eg: https://github.com/scriptum/Cheetah-Texture-Packer) - but i like this one the best so far.

[urraka]

That sounds reasonable enough to me. I can make it handle plain duplicates for a start and then see if rotated/flipped can be added.

[josefnpat]

@ninnghazad smart thinking!