Re: Something wrong with this PDF to PS conversion

On 29 September 2016 at 16:14, Alex Korobkin <[email protected]> wrote:
> You guys are pro at deciphering PostScript, I was hoping you can help me
> with this problem below. I don't know where else to ask.
>
> Here is a seemingly valid roboto.pdf with a single line of text and one
> special character, å. When this PDF is passed through cgpdftops (Apple's PS
> filter), it comes out invalid.
>
> GhostScript would say:
> GPL Ghostscript 9.05: Error: Font Renderer Plugin ( FreeType ) return code =
> -10
> Can't render Font RGEZEM+Roboto-Regular with FAPI, will do with native GS
> renderer.
> Can't render Font F1.1 ( aliased from RGEZEM+Roboto-Regular ) with FAPI,
> will do with native GS renderer.
>
> ERROR: rangecheck
> Offending command: show
>
> Stack: (!)
>
> What's wrong with the way this PS conversion was done?
> Could the original PDF be encoded in a different way to avoid this?

There's a broken Truetype font in the Postscript - it lacks a cmap
table which is a mandatory table in Truetype. It also looks like some
offsets or table lengths are wrong.

The way to avoid this problem would be to use a non-broken TTF......

I doubt whether it is feasible to make the Postscript interpreter any
more tolerant of such problems.

Chris