> I believe that KISS is still one of the most important principles.
Hidden functionality violating existing data checks and passing unrelated data
through fields intended and document for something else working only for a
single application and a single backend and requiring new surgery for every
kind of similar requirement only meets the "stupid" moniker of KISS since it
leads to ballooning code and requires every single person wanting to implement
something new to submit their own patches to the core of LilyPond rather than
being able to use existing hooks.
Of course you are right about my suggestion not covering supplemental preamble
material: that could be naturally implemented in the same manner, again
covering a number of backends and the needs for a lot of applications.
---
** [issues:#5162] Some hooks useful for video production**
**Status:** New
**Created:** Tue Jul 25, 2017 05:48 PM UTC by Knut Petersen
**Last Updated:** Wed Jul 26, 2017 09:22 AM 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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