More diagnostics in imagespeed_test to pinpoint bottlenecks
scoped_array template for simple memory management of dynamically-alloced array
ImageBuf perf improvement -- hold local pixels in scoped_array rather than std::vector
in order to reduce needless initialization of the buffers.
ImageCache perf: for tile pixel mem, use scoped_array rather than std::vector
in order to avoid useless initialization of the memory when it's allocated.
ImageCache perf: use scoped_array rather than vector for read_untiled temp memory
ImageCache perf: read_untiled autotile case -- use read_scanlines instead of read_scanline
ImageCache perf: refactor get_pixels to do fewer tile queries
ImageCache speedups -- remove pow2 roundups of autotile tile sizes.
This was an artifact of an old restriction of TextureSystem which is no
longer necessary.
oiiotool - fix minor bug where tiled files were output inappropriately.
Merge pull request #480 from lgritz/lg-icperf

ImageCache/ImageBuf read performance improvements