Smarter padding in bin packer #7
Description
When padding is enabled the bin packer puts the padding around every rectangle. This wastes bin space, because we end up with double padding between rectangles. In 1D, with 2 insertions of size 1 and padding 1 we get _#__#_ where _ is padding and # is the inserted object. Whereas we could have _#_#_ or even #_# if padding at the edges isn't required. This can save a bunch of pixels for a font atlas.
For the implementation we can store padded rectangles, but when looking for a spot to place a rectangle, don't apply padding.
- Should make padding at edges optional (because it will be off by default with this technique).
- Should ignore overlap/OOB when inserting padded rectangle (padding of inserted rectangles will overlap with filled space in the bin or might fall outside bin).