Few more optimizations introduced last week. This time I focused on the intermediate caching of image data, which is particularly important when filters with large input padding are involved (like large blurs or the “split details” module).
Now the code is able to automatically identify the the intermediate buffers for which padding is needed, and it introduces in-memory tile caches to avoid re-computation of pixels.
For example, the time required to export the amsterdam.pef image to Jpeg with an additional “split details” layer and 5 levels goes from 14600 ms without caching to 9250 ms with caching enabled.
The mechanism still requires some tweaking and further optimization, but the improvements are already non negligible.
Updated packages for the stable and linear_gamma branches can be found here and here respectively.