Re: Font specification question (for modifying plftable.h)

Hi Edward,

It's really only redistribution (and, of course, software-as-a-service 
due to the AGPL restrictions in that area) that you have to worry about. 
If it's all for your own use, then you're almost certainly fine.

Chris


On 04/03/15 02:51, Edward Mendelson wrote:
> Hello Chris,
>
> I’m very grateful for this, and for the pointer to the IRC channel, which I’ll use in the future.
>
> About licensing - I’ll definitely look at the license and see whether I’m using them properly in my build (which adds some completely public-domain fonts for my own private use).
>
> Thank you again!
>
> Edward Mendelson
> Contributing Editor
> PC Magazine/PCMag.com
>
>
>
>> On Mar 3, 2015, at 12:55 PM, Chris Liddell <[email protected]> wrote:
>>
>> Right, our PCL guy says:
>>
>> "PCL's pitch parameter is the characters per inch, it is used for
>> spacing in fixed width characters and for horizontal motion index (see
>> manual) for proportional fonts.  Instead of storing characters per
>> inch we store centipoints per character in the table.  The value in
>> the table is the default pitch.  So for courier - 600 centipoints per
>> character is equal to 12 characters per inch.  Courier is fixed so all
>> characters will be spaced 12 characters per inch.  Your font will be
>> close to double the characters per inch, but for proportional fonts
>> the pitch is only used for space width guidance and in a few other
>> quirky circumstances.  Characters will have different width because it
>> is a proportional font, so the 313 centipoints only refers to the
>> space character (hmi).  The 720000.0 / 313 is  character per inch
>> times 100 to avoid floating point."
>>
>> Hopefully, that gives you enough to get you where you need to be.
>>
>>
>> By the way, I'm not sure if this has been mentioned before, but you're likely to get better/faster responses by asking on our IRC channel #ghostscript on freenode (or go to www.ghostscript.com and there is a link to open it in a web based IRC client). This list (gs-devel) is rarely used now, only myself and one other active developer check it, and not regularly.
>>
>>
>>
>> Also, obviously I'm not aware of your usage of ghostpcl, but I noticed you implied in a previous message that other people were using your customised version - I just wanted to make sure you were aware that although the source code is licensed under the AGPL, the TTF fonts for PCL are under a much more restricted license (beyond our control, I might add).
>>
>> Chris
>>
>>
>> On 03/03/15 10:43, Chris Liddell wrote:
>>> We don't really support modifying the font table, since it effectively
>>> breaks the printer compatibility that we support.
>>>
>>> I'll point our resident PCL expert at this, and hopefully he'll reply.
>>>
>>> Chris
>>>
>>>
>>> On 28 February 2015 at 20:42, Edward Mendelson <[email protected]> wrote:
>>>
>>>> Is there documentation for the font descriptors in plftable.h?
>>>>
>>>> The GhostPDL documentation here -
>>>>
>>>> http://svn.ghostscript.com/ghostscript/trunk/ghostpdl/doc/ghostpdl.pdf
>>>>
>>>> - says
>>>>
>>>> "To use a new set of TrueType fonts requires modifying the C code in the
>>>> fi le pl/plftable.c. The C structure
>>>> resident table contains a list of Windows TrueType font names. In the
>>>> released package these names will
>>>> correspond with the Windows True Type font names in the URW font set. To
>>>> use a di fferent font set these
>>>> names must be replaced with the new font names and the code (at least the
>>>> plftable.c module) should be
>>>> recompiled and linked."
>>>>
>>>> I've had no trouble adding monospace fonts to plftable.h (I use a licensed
>>>> Prestige Elite TTF), but I'm baffled by one thing about proportional fonts.
>>>> The code in plftable.h includes lines like this for each font (this example
>>>> is from Albertus Medium):
>>>>
>>>> {0, 1, {313.0, 720000.0 / 313.0}, 0, REGULAR, MEDIUMBOLD, 4362, 27},
>>>>
>>>> My question is: what does "313.0" measure? And, since I'm asking, what
>>>> does 720000 measure? (I understand that the printer internal unit is 1/7200
>>>> inch, but I don't know whether this is another way of indicating that same
>>>> unit.)
>>>>
>>>> Many thanks for any help with this.
>>>>
>>>> Edward Mendelson
>>>> Contributing Editor
>>>> PC Magazine/PCMag.com
>>>>
>>>>
>>>> _______________________________________________
>>>> gs-devel mailing list
>>>> [email protected]
>>>> http://ghostscript.com/cgi-bin/mailman/listinfo/gs-devel
>>>>
>>>
>>
>
>

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