Well, not every simple solution is
> far too ad-hoc.
I believe that KISS is still one of the most important priciples.
It is evident that the proposed change to color? and setcolor cannot harm any
existing code as lilyponds behaviour does not change unless overloaded-rgb? is
set to #t.
It is also evident that the proposed change to dump-page cannot harm any
existing code as lilyponds behaviour does not change unless
use-ps-dump-page-replacement? is set to #t.
It's also quite obvious that the possibility to pass some code directly to the
postscript prolog simply by string-appending it to ps-user-prolog is a usefull
feature and does no harm. This feature might also be used for other purposes,
e.g. watermarking and page decoration.
Yes. It would be possible to allow color to be either a list of three numbers
in the range [0..1] or a list starting with some symbol followed by other
values.
You state that this approach would lead to
> useful extensibility.
I tend to believe that it is nothing but over-engineering.
Knut
---
** [issues:#5162] Some hooks useful for video production**
**Status:** New
**Created:** Tue Jul 25, 2017 05:48 PM UTC by Knut Petersen
**Last Updated:** Tue Jul 25, 2017 06:26 PM UTC
**Owner:** Knut Petersen
**Attachments:**
-
[0001-Implement-some-hooks-useful-for-producing-score-vide.patch](https://sourceforge.net/p/testlilyissues/issues/5162/attachment/0001-Implement-some-hooks-useful-for-producing-score-vide.patch)
(7.7 kB; text/x-patch)
Producing ps or pdf documents intended to be used as
a source for video production requires some changes to
the output at a very late stage.
Often a page needs to repeated more than once with only
changes to some kind of progress bar / line or changes
to the color of a few grobs.
Parts of this postprocessing might be passed to postscript,
parts of this postprocessing might be done in the dump-page
procedure.
Therefore this patch provides a hook to write arbitrary
code to the prolog section of postscript output and a
hook to take over the dump-page process.
Using rgb values < 0 and > 1 for grobs is an efficient
way to pass the information that, when and for how long
an object should change its color to a late state of
processing. Therefore a way to disable the range
check implemented in color? and to disable the precision
restriction in setrgbcolor is provided.
---
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