[HarfBuzz] Adding tracing

[Behdad Esfahbod]

On 05/11/2010 02:09 PM, Martin Hosken wrote:
> Dear All,
> 
> I've added tracing to harfbuzz-ng. This is to help font developers rather than programmers, figure out what is going on with their fonts. The cost is a simple if() for each lookup. If that is too high, we can probably make tracing optional.


Thanks Martin,

I took a look. I'd rather do that as compile-time debugging like I do for
sanitize and apply currently.  Will get to it when fleshing hb_shape() out.

behdad