[poppler] Kerning pair information help

[Steve W]

Alright. Thanks everyone, this is the information I was looking for.

I realize now that I may be dealing now w/ character spacing vs kerning, as
well as looking at a potentially non-standard pdf.

Thanks again,
-Steve

On Thu, Aug 11, 2011 at 12:14 PM, Josh Richardson <jric at chegg.com> wrote:

> Kerning is generally handled by the font program.  PDF spec does allow
> overrides of kerning, and Poppler should handle that, but I suspect you're
> looking for the kerning info built directly into the font.  I'm new to this,
> but I think Poppler just does what it's told when it comes to the font's
> kerning (look at the drawChar function in the output device, and trace it
> backwards to see where it's computing character offsets.)
>
> Best, --josh
>
> From: Steve W <stevew1024 at gmail.com>
> Date: Thu, 11 Aug 2011 12:03:51 -0700
> To: "poppler at lists.freedesktop.org" <poppler at lists.freedesktop.org>
> Subject: Re: [poppler] Kerning pair information help
>
> Yes, I'm using embedded fonts. I've looked the the pdf itself and
>  understand that there is no kerning information there.
>
> It looks like some pdf creators automatically break up the text into
> different groups to handle kerning, but others do not. I'm trying to access
> the kerning information in the latter case in poppler. I've confirmed that
> it renders correctly by comparing to adobe acrobat reader, I just need
> pointed in the right direction regarding the source.
>
> Are there no character pair mappings that contain this information in
> poppler?
>
> -Steve
>
> 2011/8/11 suzuki toshiya <mpsuzuki at hiroshima-u.ac.jp>
>
>> Hi Steve,
>>
>> Excuse me, do you assume that PDF (or embedded font in PDF)
>> has some kerning information and PDF rendering system should
>> reflect it?  I'm afraid that PDF itself does not have, and,
>> embedded font in PDF may have it but they are simply ignored.
>> If you find some kerning feature that is specified in official
>> PDF spec and unimplemented in poppler, please let me know.
>>
>> I guess, PDF production system should tune the glyph positions
>> strictly, and should not ask PDF rendering systems to reflect
>> some kerning.
>>
>> Regards,
>> mpsuzuki
>>
>> Steve W wrote:
>> > I'm new to poppler and am trying to get a grasp of the source code. I'm
>> > trying to find where the kerning pair information can be accessed via
>> > poppler. Obviously poppler has access to it somewhere, as font's with
>> > kerning information are rendered correctly in pdftoppm...
>> >
>> > I tried searching for 'kerning' and other related terms, but haven't
>> found
>> > anything.
>> >
>> > I'd greatly appreciate it if someone could point me to the relevant
>> function
>> > or source file to get met started.
>> >
>> > Thanks
>> > -Steve
>> >
>> >
>> >
>> > ------------------------------------------------------------------------
>> >
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>> > http://lists.freedesktop.org/mailman/listinfo/poppler
>>
>>
>
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