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Re: findfont vs selectfont

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  Re: findfont vs selectfont jdaw1 <jdawiseman@gmail.com> - 2016-08-11 04:39 -0700
    Re: findfont vs selectfont Carlos <angus@quovadis.com.ar> - 2016-08-11 17:05 +0200
      Re: findfont vs selectfont jdaw1 <jdawiseman@gmail.com> - 2016-08-12 02:28 -0700
        Re: findfont vs selectfont Carlos <angus@quovadis.com.ar> - 2016-08-12 12:26 +0200
          Re: findfont vs selectfont ken <ken@spamcop.net> - 2016-08-12 11:36 +0100
            Re: findfont vs selectfont Carlos <angus@quovadis.com.ar> - 2016-08-12 16:17 +0200
              Re: findfont vs selectfont ken <ken@spamcop.net> - 2016-08-12 15:53 +0100
                Re: findfont vs selectfont luser droog <luser.droog@gmail.com> - 2016-08-12 14:09 -0700

#2749 — Re: findfont vs selectfont

It could be that ‘/Helvetica 10 selectfont’ checks whether the current font is Helvetica 10, and only if it isn’t does it do the ‘… findfont … scalefont setfont’. That alone might remove from the execution time many instances, perhaps many many instances, of ‘findfont’.

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#2750

On 11/08/2016 13:39, jdaw1 wrote:
> It could be that ‘/Helvetica 10 selectfont’ checks whether the
> current font is Helvetica 10, and only if it isn’t does it do the ‘…
> findfont … scalefont setfont’. That alone might remove from the
> execution time many instances, perhaps many many instances, of
> ‘findfont’.
>

Does this mean there is a simple way to get the current font size? What 
is it?

(The "not simple" way would be dividing the y component of the current 
font matrix by the one of the original font.)

-- 

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#2756

From www.jdawiseman.com/papers/placemat/placemat.ps (which I know isn’t what you want):


% http://bugs.ghostscript.com/show_bug.cgi?id=689664
/CurrentFontSize
{
	DeBugLevel 5 le {(+CurrentFontSize) OutputToLog} if
	currentfont dup
	/FontMatrix get 3 get  % current y scale
	exch /FontName get findfont /FontMatrix get 3 get  % original y scale
	div
	DeBugLevel 5 le {(-CurrentFontSize) OutputToLog} if
} bind def  % /CurrentFontSize
% https://groups.google.com/forum/#!topic/comp.lang.postscript/cteFkRmWMVg
/CurrentFontName {currentfont /FontName get} bind def

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#2757

On 12/08/2016 11:28, jdaw1 wrote:
>  From www.jdawiseman.com/papers/placemat/placemat.ps (which I know isn’t what you want):
>
>
> % http://bugs.ghostscript.com/show_bug.cgi?id=689664
> /CurrentFontSize
> {
> 	DeBugLevel 5 le {(+CurrentFontSize) OutputToLog} if
> 	currentfont dup
> 	/FontMatrix get 3 get  % current y scale
> 	exch /FontName get findfont /FontMatrix get 3 get  % original y scale
> 	div
> 	DeBugLevel 5 le {(-CurrentFontSize) OutputToLog} if
> } bind def  % /CurrentFontSize
> % https://groups.google.com/forum/#!topic/comp.lang.postscript/cteFkRmWMVg
> /CurrentFontName {currentfont /FontName get} bind def
>

I was using this

/currentfontheight {
     currentfont /FontMatrix get 3 get
     currentfont /OrigFont get /FontMatrix get 3 get
     div
} bind def

but now I wonder whether all fonts have an OrigFont entry...

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#2758

In article <nok88d$qc7$1@dont-email.me>, angus@quovadis.com.ar says...

> /currentfontheight {
>      currentfont /FontMatrix get 3 get
>      currentfont /OrigFont get /FontMatrix get 3 get
>      div
> } bind def
> 
> but now I wonder whether all fonts have an OrigFont entry...

No, they don't. Are you using Ghostscript by any chance ?

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#2759

On 12/08/2016 12:36, ken wrote:
> In article <nok88d$qc7$1@dont-email.me>, angus@quovadis.com.ar says...
>
>> /currentfontheight {
>>       currentfont /FontMatrix get 3 get
>>       currentfont /OrigFont get /FontMatrix get 3 get
>>       div
>> } bind def
>>
>> but now I wonder whether all fonts have an OrigFont entry...
>
> No, they don't. Are you using Ghostscript by any chance ?

Yes. So, I assume this is a ghostscriptism?

-- 

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#2760

In article <noklpl$6nl$1@dont-email.me>, angus@quovadis.com.ar says...
> 
> On 12/08/2016 12:36, ken wrote:
> > In article <nok88d$qc7$1@dont-email.me>, angus@quovadis.com.ar says...
> >
> >> /currentfontheight {
> >>       currentfont /FontMatrix get 3 get
> >>       currentfont /OrigFont get /FontMatrix get 3 get
> >>       div
> >> } bind def
> >>
> >> but now I wonder whether all fonts have an OrigFont entry...
> >
> > No, they don't. Are you using Ghostscript by any chance ?
> 
> Yes. So, I assume this is a ghostscriptism?


Its added by the Ghostscript font machinery for internal purposes. It is 
not guaranteed to be present on any other interpreter. As it is a 
Ghostscript internal feature (not part of the API) it may change without 
notice, you sholdn't use it.


				Ken

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#2761

On Friday, August 12, 2016 at 9:53:39 AM UTC-5, ken wrote:
> In article <noklpl$6nl$1@dont-email.me>, angus@quovadis.com.ar says...
> > 
> > On 12/08/2016 12:36, ken wrote:
> > > In article <nok88d$qc7$1@dont-email.me>, angus@quovadis.com.ar says...
> > >
> > >> /currentfontheight {
> > >>       currentfont /FontMatrix get 3 get
> > >>       currentfont /OrigFont get /FontMatrix get 3 get
> > >>       div
> > >> } bind def
> > >>
> > >> but now I wonder whether all fonts have an OrigFont entry...
> > >
> > > No, they don't. Are you using Ghostscript by any chance ?
> > 
> > Yes. So, I assume this is a ghostscriptism?
> 
> 
> Its added by the Ghostscript font machinery for internal purposes. It is 
> not guaranteed to be present on any other interpreter. As it is a 
> Ghostscript internal feature (not part of the API) it may change without 
> notice, you sholdn't use it.
> 

/findfont yields the "OrigFont". This may be less 
efficient, but should be portable[1].

/currentfontheight {
    currentfont dup /FontMatrix get 3 get
    exch /FontName get findfont /FontMatrix get 3 get
    div
} bind def

[1] but not (yet) with xpost, which does not (currently)
expose the internals of Type 1 fonts, and does not
(currently) correctly handle multiple instances of Type 3
fonts.

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