> Why would you compare with theoretical results when your rasterizer
> uses discrete and less accurate bisections? Shouldn't you compare
> with the rendering results? One way or the other 3/64 of a pixel is
> really small difference.
Well, your results differ from the original ones. I don't know
whether it differs to the better or to the worse (and, admittedly, I
don't know how good the bboxes computed with the original FreeType
code actually are). This is my only concern.
Ok. I'll work on this. I'll do upscaling/downscaling to get rid of rounding errors.
Given that bboxes are of really great importance, and that even
smallest rounding errors (to integers) can cause clipping, a
comparison to high-precision results is probably good, regardless of
the old or new code.