OpenImageIO/oiio — pull request #190 by rmv (2011-11-04 02:57:09+00:00)
Title: Added autoscanline option to make autotiles as wide as the whole image.

If autoscanline is off, to load a 64x64 tile that has been purged you need to read in again the whole 4096x64 scanlines.

With it on, auto-tiles are set, for example, to 4096x64. This forces the cache to work with batches of 64 scanlines.

This corresponds better with the loading costs of untiled images and
improves cache performance, specially when more threads are accessing the same image.