Re: [ft-devel] Artefacts when rendering with FreeType 2.4.9

[Alexei Podtelezhnikov]

On Wed, Jun 6, 2012 at 7:25 AM, Werner LEMBERG <address@hidden> wrote:
>
>>>>> The only potential change in question is this:
>>>>> http://git.savannah.gnu.org/cgit/freetype/freetype2.git/commit/?id=7baeeafcec7fd2267191937e14c1f753424beb89
>>
>> Your guess was not wrong!  This morning I repeated the tests, I had
>> conducted yesterday.  I had been in a hurry and obviously mixed
>> something up.  If I just revert the two lines everything is ok.
>
> Fixed in git.  Thanks to both of you for the report and analysis!
>
> Please test.
>

Alright. Do you understand the Rx calculations? They are wrong if
integer overflows, aren't they? So there will be artifacts, possibly
very small ones, when SMulDiv_NoRound becomes necessary. Aren't we
overthinking here? Does Ftgrays avoid FT_MulDiv by splits long lines?