Re: Query regarding CFF font handling

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Morning Alexei.

Thanks for your patience with this.
I can now see what you mean by using the identical slow fallback in
base/ftadvanc.c.
This now works for me.

Again sorry to not have worked this out from your first email. regards Tony
Smith.

On Thu, 23 Oct 2025 at 19:08, Alexei Podtelezhnikov <[email protected]>
wrote:

> Tony,
>
> The reason for the failure is that the first check in the function
> cff_get_advance, shown below, always fails.  At no point is there a check
> for FT_ADVANCE_FLAG_FAST_ONLY of the flag passed into the function.
>
> cff_get_advance( ... )
> {
>     if ( !FT_IS_SFNT( face ) )                                  // <-----
> always fails, regardless of the flags
>       return FT_THROW( Unimplemented_Feature );
>   ...
> }
>
>
> This error is ignored in base/ftadvanc.c and the identical slow fallback
> is implemented there. It is true that cff_get_advance used to ignore
> FT_ADVANCE_FLAG_FAST_ONLY, which was incorrect.
>
> Alexei
>

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<div dir=3D"ltr"><div>Morning Alexei.</div><div><br></div><div>Thanks for y=
our patience with this.</div><div>I can now see what you mean by using the =
identical slow fallback in base/ftadvanc.c.</div><div>This now works for me=
.</div><div><br></div><div>Again sorry to not have worked this out from you=
r first email. regards Tony Smith.</div><div><br></div><div class=3D"gmail_=
quote gmail_quote_container"><div dir=3D"ltr" class=3D"gmail_attr">On Thu, =
23 Oct 2025 at 19:08, Alexei Podtelezhnikov &lt;<a href=3D"mailto:apodtele@=
gmail.com">[email protected]</a>&gt; wrote:<br></div><blockquote class=3D"=
gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(20=
4,204,204);padding-left:1ex"><div dir=3D"auto">Tony,<br id=3D"m_-2532674849=
941410118lineBreakAtBeginningOfSignature"><div dir=3D"ltr"><br></div><block=
quote><div dir=3D"ltr"><div dir=3D"ltr"><div><div>The reason for the failur=
e is that the first check in the function cff_get_advance, shown below, alw=
ays fails.=C2=A0 At no point is there a check for FT_ADVANCE_FLAG_FAST_ONLY=
 of the flag passed into the function.</div><div><br></div></div><blockquot=
e style=3D"margin:0px 0px 0px 40px;border:none;padding:0px"><div><div>cff_g=
et_advance( ... )=C2=A0 =C2=A0</div></div><div><div>{</div></div><div><div>=
=C2=A0 =C2=A0 if ( !FT_IS_SFNT( face ) )=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 // &lt;----- always fails, regardless of the flags</div></div><d=
iv><div>=C2=A0 =C2=A0 =C2=A0 return FT_THROW( Unimplemented_Feature );</div=
></div><div><div>=C2=A0 ...</div></div><div><div>}</div></div></blockquote>=
</div></div></blockquote><div><br></div><div>This error is ignored in base/=
ftadvanc.c and the identical slow fallback is implemented there. It is true=
 that cff_get_advance used to ignore FT_ADVANCE_FLAG_FAST_ONLY, which was i=
ncorrect.</div><div><br></div><div>Alexei</div></div></blockquote></div></d=
iv>

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