[NTG-context] Re: PDF, runner, and TikZ patches

[Jim <zlists+context@jdvb.ca>]

On Fri, Mar 15, 2024 at 09:44 (+0100), Hans Hagen wrote:

> On 3/15/2024 12:53 AM, Jim wrote:
>> Max (et al),

>> were you hoping the ConTeXt distribution would ship its own
>> pgfutil-context.def, or were you hoping that someone could convince Henri
>> to put the RGB change in?

>> And, if anyone has the will to push this (or add it in to a ConTeXt
>> distribution version), I'd still like the cmyk support, even if there is no
>> ability to specify colour profiles:

>> \def\pgfutil@emu@cmyk#1#2,#3,#4,#5\@nil
>> {
>>      \pgfmathsetmacro{\@red@}{(1 - #2) * (1 - #5)}%
>>      \pgfmathsetmacro{\@green@}{(1 - #3) * (1 - #5)}%
>>      \pgfmathsetmacro{\@blue@}{(1 - #4) * (1 - #5)}%
>>      \expandafter\edef\csname\string\color@#1\endcsname
>>      {\noexpand\xcolor@ {}{}{rgb}{\@red@,\@green@,\@blue@}}
>> }

>> I don't see that it would hurt anything, even if it doesn't give complete
>> cmyk support.

> We provide

> \pgf@context@registercolor
> \pgf@context@registergray
> \pgf@context@registerrgb
> \pgf@context@registercmyk

> in colo-ini that hook into the context color mechanism so be careful with
> patches.  I'm not going to spend time on other solutions that can interfere
> with internals.

Thanks Hans, I was not familiar with those.  The above code worked fine for
me in plain TeX (the last time I used it, anyway).

By the looks of things, Max has a vastly better idea of ConTeXt internals
than I do, and if his proposed \pgfutil@emu@rgb doesn't break anything, it
might give some confidence that the above \pgfutil@emu#cmyk won't either.
(Yeah, I know, that is hardly a robust argument of anything.)

> (I wonder when the moment comes that we have to take a snapshot of tikz and
> stay with that.)

I hope that time doesn't come, because either someone (you? :-) would be
left with an on-going job of patching the snapshot, or ConTeXt's version of
tikz would become increasingly different (and, presumably, increasingly
less capable than the "mainline" version).

Cheers.

                                Jim
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