> Werner, I thought you always CC-ed me when things like these came
> up!;-)
Will try to remember! And thanks for your analysis.
> I see the very same asymmetry onmy rasterizer.
Ha! I *have* known it!
> Point 25 is the problematic point. I've calculated it all;
> Microsoft rounds the x-coordinate 895.455782 up to 896 (14.0) in an
> interpolate instruction. It is then rounded to half a pixel, to
> 14.5 according to the MS interpreter, to 13.5 according to
> FreeType's and mine. A delta instruction then moves it left to 13.5
> (12.5). To conclude, the MS rasterizer does faulty rounding here,
> and a delta instruction could have been spared if they had
> implemented it properly.
Well, this is by far the most noticeable bug in the MS TT rasterizer.
It's a tragedy that we know that we are right and MS is wrong but the
rest of the world thinks exactly the opposite :-(
> A related point: Do you keep some registry of these discrepancies?
The `registry' is the mailing list. And no, I haven't collected the
data yet, and I agree that it would be a good idea to do that, putting
such a file into FreeType's `docs' directory. Volunteers?
> At some point someone might want to adapt the FreeType interpreter
> to mimic all MS rounding errors.
I fear that too. Any idea how to do that?
Werner
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